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Sample records for camara pulpar devido

  1. Study in vitro of dental enamel irradiated with a high power diode laser operating at 960 nm: morphological analysis of post-irradiation dental surface and thermal effect analysis in pulp chamber due to laser application; Estudo in vitro do esmalte dental irradiado com laser de diodo de alta potencia em 960 nm: analise morfologica da superficie dental pos-irradiada e analise do comportamento termico na camara pulpar devido a aplicacao laser

    Energy Technology Data Exchange (ETDEWEB)

    Quinto Junior, Jose

    2001-07-01

    Objectives: This study examines the structural and thermal modifications induced in dental enamel under dye assisted diode laser irradiation. The aim of this study is to verify if this laser-assisted treatment is capable to modify the enamel surface by causing fusion of the enamel surface layer. At the same time, the pulpal temperature rise must be kept low enough in order not to cause pulpar necrosis. To achieve this target, it is necessary to determine suitable laser parameters. As is known, fusion of the enamel surface followed by re-solidification produce a more acid resistant layer. This surface treatment is being researched as a new method for caries prevention. Method and Materials: A series of fourteen identically prepared enamel samples of human teeth were irradiated with a high power diode laser operating at 960 nm and using fiber delivery. Prior to irradiation, a fine layer of cromophorous ink was applied to the enamel surface. In the first part of the experiment the best parameter for pulse duration was determined. In the second part of the experimental phase the same energy density was used but with different repetition rates. During irradiation we monitored the temperature rise in the pulpal cavity. The morphology of the treated samples was analysed under SEM. Results: The morphology of the treated samples showed a homogeneously re-solidified enamel layer. The results of the temperature analysis showed a decrease of the pulpal temperature rise with decreasing repetition rate. Conclusion: With the diode laser it is possible to cause morphological alterations of the enamel surface, which is known to increase the enamel resistance against acid attack, and still maintain the temperature rise in the pulpar chamber below damage threshold. (author)

  2. Respuesta Pulpar ante el recubrimiento Pulpar Directo: Revisión de la literatura

    OpenAIRE

    Camejo Suarez, Maria Valentina

    1999-01-01

    El recubrimiento pulpar directo es considerado un procedimiento controversial, debido a que la información concerniente al uso de esta técnica es escasa y ha sido desarrollada sobre la base de razonamientos empíricos y como consecuencia hay desconfianza por parte de los clínicos hacia estos procedimientos conservadores, a pesar de los avances en la práctica del recubrimiento directo. Se han empleado muchos materiales para el recubimiento pulpar directo y se ha aceptado el hidróxido de calcio ...

  3. Urgencias estomatológicas por lesiones pulpares Dental emergencies caused by pulpar lesions

    Directory of Open Access Journals (Sweden)

    Yunaisy Montoro Ferrer

    2012-12-01

    Full Text Available Varias son las enfermedades que llevan a los pacientes a acudir a la consulta de urgencias estomatológicas, la gran mayoría corresponde a afecciones pulpares debido a la sintomatología dolorosa que las caracteriza. El objetivo de este trabajo describir el comportamiento de las enfermedades pulpares en pacientes del área de salud de la clínica estomatológica “27 de Noviembre” en el período comprendido entre los meses de octubre 2008 a diciembre 2009, se realizó un estudio analítico de corte transversal en el cual se incluyeron 173 pacientes adultos entre 19 y 59 años que acudieron al servicio con diagnóstico de cualquiera de las enfermedades pulpares agudas. Del total de casos diagnosticados el 81 para un 46,8 % correspondió a la pulpitis aguda irreversible, el 34,7 % a pulpitis transitoria y el 18,5 % a hiperemia pulpar. El grupo dentario más afectado fue el de los molares y el tipo de lesión pulpar resultó independiente del grupo dentario al igual que resultó independiente del factor causal, entre los cuales aparece con un alto predominio la caries dental con un 65,9 %; el dolor tanto en tipo como en intensidad dependen del tipo de lesión que tenga la pulpa según los resultados del estadígrafo X² de Pearson obtenidos en el estudio, donde el dolor espontáneo se presentó solamente para los pacientes con pulpitis aguda irreversible, en los que ningún caso se reportó el dolor con categoría leve.There is a range of diseases that make the patients go to the dental emergency service; most of them result from pulp disorders due to the painful symptoms that characterize them. The objective of this paper was to describe the behavior of pulp diseases in patients from the health area of "27 de Noviembre2dental clinic in the period of October 2008 through December 2009. To this end, a cross-sectional analytical study was conducted in 173 adult patients aged 19 to 59 years and diagnosed as having any of the acute pulp diseases

  4. Urgencias estomatológicas por lesiones pulpares

    Directory of Open Access Journals (Sweden)

    Yunaisy Montoro Ferrer

    2012-12-01

    Full Text Available Varias son las enfermedades que llevan a los pacientes a acudir a la consulta de urgencias estomatológicas, la gran mayoría corresponde a afecciones pulpares debido a la sintomatología dolorosa que las caracteriza. El objetivo de este trabajo describir el comportamiento de las enfermedades pulpares en pacientes del área de salud de la clínica estomatológica “27 de Noviembre” en el período comprendido entre los meses de octubre 2008 a diciembre 2009, se realizó un estudio analítico de corte transversal en el cual se incluyeron 173 pacientes adultos entre 19 y 59 años que acudieron al servicio con diagnóstico de cualquiera de las enfermedades pulpares agudas. Del total de casos diagnosticados el 81 para un 46,8 % correspondió a la pulpitis aguda irreversible, el 34,7 % a pulpitis transitoria y el 18,5 % a hiperemia pulpar. El grupo dentario más afectado fue el de los molares y el tipo de lesión pulpar resultó independiente del grupo dentario al igual que resultó independiente del factor causal, entre los cuales aparece con un alto predominio la caries dental con un 65,9 %; el dolor tanto en tipo como en intensidad dependen del tipo de lesión que tenga la pulpa según los resultados del estadígrafo X² de Pearson obtenidos en el estudio, donde el dolor espontáneo se presentó solamente para los pacientes con pulpitis aguda irreversible, en los que ningún caso se reportó el dolor con categoría leve.

  5. Effects of Corynespora cassiicola on Lantana camara Efeitos de Corynespora cassiicola sobre Lantana camara

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    J.L. Passos

    2010-06-01

    Full Text Available The present study combines the examination of toxins produced by C. cassiicola and the effects of the fungus colonization on L. camara. C. cassiicola was cultivated on solid media and the crude extracts CAE and CE were produced. Both extracts were submitted to a seed germination and growth assay utilizing Physalis ixocarpa, Trifolium alexandrinum, Lolium multiflorum and Amaranthus hypochodriacus. The effect of the extracts on the ATP-synthesis in isolated spinach chloroplasts was also tested. Bioassay guided chromatographic fractionation identified the most active extract (CAE. From this extract ergosta-4,6,8(14,22-tetraen-3-one (C1 and fatty acids were isolated. The C1 compound reduce ATP synthesis in isolated spinach chloroplasts. The interference of fatty acids with ATP synthesis and also with weed growth provides one explanation of the phytogrowth-inhibitory properties of such fungal extracts. Histological observations involving fungus-plant interaction were made on L. camara plants inoculated with C. cassiicola conidia suspension. After inoculations, fragments of the leaf blades were prepared for observation by light and scanning electron microscopy. Fungal colonization of Lantana camara was typical of a necrotroph and penetration initiated a hypersensitive response. L. camara reacted to the pathogen penetration through thickening of the epidermis walls, cytoplasm granulation and a cicatrisation tissue.O presente estudo combina a investigação de toxinas produzidas por C. cassiicola e os efeitos da colonização do fungo sobre L. camara. C. cassiicola foi cultivado em meio sólido do qual se obtiveram os extratos brutos CAE e CE. Ambos os extratos foram submetidos aos testes de germinação e crescimento utilizando Physalis ixocarpa, Trifolium alexandrinum, Lolium multiflorum e Amaranthus hypochodriacus e sobre a síntese de ATP em cloroplastos isolados de espinafre. Os bioensaios direcionaram o fracionamento cromatográfico permitindo a

  6. Pharmacognostic study of Lantana camara Linn. root

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    Dinesh Kumar

    2012-05-01

    Full Text Available Objective: The study was carried out to perform the pharmacognostic evaluation of Lantana camara Linn. root. Method: The pharmacognostic evaluation was done in terms of organoleptic, macro-microscopy, fluorescence analysis and physicochemical parameters. Results: The characteristic macroscopic features showed that the root consists of 25-40 cm long, 0.2-4.0 cm thick pieces which are usually branched, shallow, tough, creamish-brown externally, outer surface rough due to longitudinal wrinkles, with hard fracture, characteristic odour and pungent taste. The main microscopic characters of the root shows exfoliating cork, consisting of about 10-15 rows of tangentially elongated, thick-walled cells followed by cortex consisting of polygonal parenchymatous cells, a few containing rhomboidal shaped calcium oxalate crystals. Endodermis consists of 3-4 layers of non-lignified, thick-walled rounded parenchymatous cells followed by a single layer of non-lignified pericycle. Phloem, a wide zone of xylem consisting of lignified pitted vessels and bi-to triseriate medullary rays are also present. Proximate physicochemical analysis of the root power showed loss on drying, total ash, water soluble ash, sulphated ash values as 0.52, 4.26, 3.8 and 5.8 % w/w respectively. Successive extraction of the root powder with petroleum ether, chloroform, alcohol, water yielded 0.19, 0.35, 2.19 and 2.0 % w/w respectively. Fluorescence study imparted characteristic colors to the root powder when observed under visible, short and long wavelength light. Conclusions: Various pharmacognostic parameters evaluated in this study helps in identification and standardization of Lantana camara L. root in crude form.

  7. Effects of Lantana camara (L.) invasion on the native vegetation of ...

    African Journals Online (AJOL)

    ... camara (L.) invasion on the native vegetation of Gonarezhou National Park, Zimbabwe. ... A total of 41 native woody species and 2 native herbaceous species were ... Keywords : Alien plants, Biodiversity, Invasive plants, Lantana camara, ...

  8. Histopatología de los procesos reparativos pulpo-dentarios en el recubrimiento pulpar directo

    OpenAIRE

    Brau Aguadé, Esteban

    1986-01-01

    Se expone el mecanismo del cierre biológico a nivel de la periferia pulpar, después del recubrimiento directo con hidróxido cálcico. En primer lugar se describen, en los casos de caries profunda, las altera­ciones pulpo-odontoblásticas preexistentes, caracterizadas por degeneración progresiva del estrato odontoblástico, junto con manifestaciones reaccionales pulpares localizadas (alteraciones circulatorias, edema, microhemorragias, áci­dez, etc.). Asimismo se consideran las lesiones por dilac...

  9. Fuerzas Ortodóncicas como Agentes Vulnerantes de la Salud Pulpar: Reporte de Dos Casos

    OpenAIRE

    Fonseca, Gabriel M; Guzmán, Andrés E

    2010-01-01

    La literatura ya ha sugerido la implicancia del uso de fuerzas ortodóncicas como productoras de daño mecánico, reacción inflamatoria periodontal, lesión periapical y reabsorción radicular. Los parámetros más comúnmente explorados en investigaciones de la respuesta tisular a fuerzas ortodónticas consisten en medir los niveles de oxígeno pulpar, la vasculatura y los cambios en la circulación sanguínea. Se ha demostrado que la irrigación pulpar disminuye tempranamente cuando se realizan aplicaci...

  10. Lantana camara L. (Verbenaceae) invasion along streams in a ...

    Indian Academy of Sciences (India)

    2014-07-16

    Jul 16, 2014 ... Understanding the spatially variable environmental factors in a heterogeneous ... quent impacts on species invasion are not understood well. ... Seasonal streams, due to the changing flux in water with ... the south-west Indian monsoon. ..... management of Lantana camara L. in Australia, India and South.

  11. Distribution of the invasive alien weed, Lantana camara , and its ...

    African Journals Online (AJOL)

    Lantana camara (lantana) is a major invasive shrub globally, impacting upon biodiversity, economies, ecosystem services, and driving socio-ecological change. The aim of this study was to determine the current and potential distribution of lantana in eastern Africa and its livelihood impacts in one region in Uganda.

  12. Uso da proteção do complexo dentino-pulpar por discentes de odontologia

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    Daiane Casarin

    2016-10-01

    Full Text Available A proteção do complexo dentino pulpar depende de vários fatores, dentre eles, a idade do paciente, a condição pulpar prévia e a profundidade da lesão cariosa ou mesmo do preparo cavitário. Os materiais utilizados para a proteção, por sua vez, devem ser biocompatíveis, ter capacidade de induzir a formação de dentina reparadora dentre outros requisitos. O objetivo deste estudo foi conhecer o material de proteção do complexo dentino pulpar utilizado pelos discentes de odontologia tanto em nível de graduação, bem como em nível de pós-graduação. A metodologia utilizada foi quantitativa observacional do tipo descritiva e não probabilística, a qual envolveu 125 estudantes do último ano de graduação em odontologia e cirurgiões dentistas cursando pós-graduação em Dentística Restauradora em centros de estudos da cidade de Passo Fundo. A coleta de dados foi realizada por meio de um questionário adaptado de Takanashi (4 e os resultados foram analisados descritivamente no Excel, sendo que para cavidades rasas 88,8 % dos profissionais usam técnica adesiva convencional, cavidades médias 60,8% também opta por técnica adesiva convencional, para cavidades profundas 50,4% usa Hidróxido de Cálcio e nos casos de exposição pulpar 59,2% faz uso de pó de Hidróxido de Cálcio. Pode-se concluir que o hidróxido de cálcio foi o material de proteção pulpar mais usado tanto nas cavidades profundas, bem como, nas com exposição pulpar, já em cavidades médias e rasas a maioria optou por técnica adesiva convencional.

  13. Repellency of Lantana camara (Verbenaceae) flowers against Aedes mosquitoes.

    Science.gov (United States)

    Dua, V K; Gupta, N C; Pandey, A C; Sharma, V P

    1996-09-01

    The repellent effect of Lantana camara flowers was evaluated against Aedes mosquitoes. Lantana flower extract in coconut oil provided 94.5% protection from Aedes albopictus and Ae. aegypti. The mean protection time was 1.9 h. One application of Lantana flower can provide more than 50% protection up to 4 h against the possible bites of Aedes mosquitoes. No adverse effects of the human volunteers were observed through 3 months after the application.

  14. LANTANA CAMARA: OVERVIEW ON TOXIC TO POTENT MEDICINAL PROPERTIES

    OpenAIRE

    Dr. Milindmitra K Lonare et al

    2012-01-01

    Lantana camara is more popular as toxic weed rather than medicinal plant in most of the countries responsible for infesting pastures, grazing lands, orchards and crops like, tea, coffee, oil palm, coconut and cotton, and reduces the economic viability of the crops. This plant can grow in even in extreme harsh climatic conditions of tropical and sub-tropical areas and has become naturalized worldwide as an ornamental plant including India. The stem, root and leaves contain many of the bioactiv...

  15. Review: Mohamed Saliou Camara, Political History of Guinea since World War Two (2014)

    OpenAIRE

    Carole Ammann; University of Basel

    2015-01-01

    Review of the monograph:Mohamed Saliou Camara, Political History of Guinea since World War Two, New York: Peter Lang, 2014, ISBN 9781433122439, 531 pp. Besprechung der Monographie:Mohamed Saliou Camara, Political History of Guinea since World War Two, New York: Peter Lang, 2014, ISBN 9781433122439, 531 Seiten

  16. LESIONES PULPARES Y PERIAPICALES EN ESCOLARES DEL AREA DE ATENCION DEL POLICLINICO DOCENTE DE PLAYA. CIUDAD DE LA HABANA

    OpenAIRE

    Betancourt Núñez, Marisette; Fernández González, María del Carmen; Valcarcel Llerandi, Julio

    2009-01-01

    La presente investigación tiene como objetivo conocer la incidencia de las lesiones pulpares y periapicales y sus causas en escolares de la enseñanza primaria del área del Policlínico Docente de Playa. La referida investigación es de tipo observacional descriptiva. La población estudiada fue de 1 137 alumnos entre 4 y 12 años de edad, a la cual se le realizó un examen bucal para determinar la presencia de patologías pulpares y periapicales, y su relación con algunas variables clínicas. Result...

  17. Procesos pulpares y periapicales agudos como urgencias estomatológicas. Holguín 2009

    OpenAIRE

    Carmen Graña Dorta; José López Clementes; Carlos Pacheco Pacheco

    2009-01-01

    Aborda un estudio observacional descriptivo de corte transversal en días comprendidos en Mayo y Junio del 2009. Se desarrolló en las consultas de urgencias de las clínicas ¨Manuel Angulo Farrán¨ y ¨Mario Pozo Ochoa¨ de la Provincia Holguín. La muestra estuvo constituida por 70 pacientes que presentaron patologías pulpares y periapicales agudas. Se Planteó como objetivo determinar las patologías más frecuente según grupos de edad y sexo, identificar las causas principales de estas afecciones y...

  18. Inducción del cierre apical en el diente con necrosis pulpar y el ápice no formado

    OpenAIRE

    Canalda Sahli, Carlos

    1988-01-01

    Se efectúa una revisión del proceso de apicoformación en dientes con necrosis pulpar y ápice no formado, analizando el mecanismo de cierre apical inducido por el hidróxido de calcio y otras substancias, así como la histopatología del mismo.

  19. Terapia pulpar em dentes decíduos: possibilidades terapêuticas baseadas em evidências

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    Natalino Lourenço Neto

    Full Text Available INTRODUÇÃO: A pulpotomia em dentes decíduos é uma técnica conservadora de terapia pulpar amplamente utilizada em Odontopediatria, sendo de fundamental importância para evitar a perda prematura desses dentes, quer seja por alterações provocadas pela cárie dentária ou traumatismo dentário. Apesar de ser uma técnica estudada há muitos anos, causa muitas controvérsias e discussões, principalmente em termos de biocompatibilidade dos medicamentos empregados e pelas dificuldades e falhas no diagnóstico da condição pulpar. OBJETIVO: Por meio de uma revisão sistemática da literatura, no período compreendido entre 2000 e 2011, e com enfoque em estudos clínicos randomizados, revisões sistemáticas e meta-análises, este trabalho teve como objetivo discutir, com base em evidências científicas, alternativas para o tratamento de pulpotomia em dentes decíduos humanos. CONCLUSÃO: As evidências científicas fidedignas com o uso de materiais capeadores pulpares e as técnicas de Eletrocirurgia e Laser de Baixa Potência foram escassas. Desta forma, sugere-se a realização de estudos complementares bem delineados estatisticamente para maiores esclarecimentos. As informações geradas em tais experimentos poderão contribuir para um melhor entendimento dos mecanismos da terapia pulpar, podendo gerar o desenvolvimento de protocolos com novas formas terapêuticas, que visam a melhorar a terapia pulpar em dentes decíduos.

  20. Caracterización morfológica de células pulpares

    OpenAIRE

    Merino, Graciela; Blascetti, Nahuel; Mayocchi, Karina; Butler, Teresa Adela; Basal, Roxana Lía; Dorati, Pablo Javier; Paggi, Ricardo; Bellesi, Carolina; Astudillo, Lisandro; Pinola, Lidia; Cantarini, Luis Martín; Micinquevich, Susana

    2017-01-01

    La investigación básica sobre células madre y el desarrollo de aplicaciones terapéuticas es uno de los campos de la investigación biomédica que más atención recibe en la actualidad. Las células madre dentales comparten muchas características con las células madre de la médula ósea de donde normalmente se extraen para las investigaciones. Objetivo: realizar una síntesis de la descripción morfológica de las células pulpares en cultivo. Para la caracterización se utilizó pulpas de gérmenes de te...

  1. Chemical Characterization and Trypanocidal, Leishmanicidal and Cytotoxicity Potential of Lantana camara L. (Verbenaceae Essential Oil

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    Luiz Marivando Barros

    2016-02-01

    Full Text Available Drug resistance in the treatment of neglected parasitic diseases, such as leishmaniasis and trypanosomiasis, has led to the search and development of alternative drugs from plant origins. In this context, the essential oil extracted by hydro-distillation from Lantana camara leaves was tested against Leishmania braziliensis and Trypanosoma cruzi. The results demonstrated that L. camara essential oil inhibited T. cruzi and L. braziliensis with IC50 of 201.94 μg/mL and 72.31 μg/mL, respectively. L. camara essential oil was found to be toxic to NCTC929 fibroblasts at 500 μg/mL (IC50 = 301.42 μg/mL. The composition of L. camara essential oil analyzed by gas chromatography–mass spectrometry (GC/MS revealed large amounts of (E-caryophyllene (23.75%, biciclogermacrene (15.80%, germacrene D (11.73%, terpinolene (6.1%, and sabinene (5.92%, which might be, at least in part, responsible for its activity. Taken together, our results suggest that L. camara essential oil may be an important source of therapeutic agents for the development of alternative drugs against parasitic diseases.

  2. The Chemical Diversity of Lantana camara: Analyses of Essential Oil Samples from Cuba, Nepal, and Yemen.

    Science.gov (United States)

    Satyal, Prabodh; Crouch, Rebecca A; Monzote, Lianet; Cos, Paul; Awadh Ali, Nasser A; Alhaj, Mehdi A; Setzer, William N

    2016-03-01

    The aerial parts of Lantana camara L. were collected from three different geographical locations: Artemisa (Cuba), Biratnagar (Nepal), and Sana'a (Yemen). The essential oils were obtained by hydrodistillation and analyzed by gas chromatography/mass spectrometry. A cluster analysis of 39 L. camara essential oil compositions revealed eight major chemotypes: β-caryophyllene, germacrene D, ar-curcumene/zingiberene, γ-curcumen-15-al/epi-β-bisabolol, (E)-nerolidol, davanone, eugenol/alloaromadendrene, and carvone. The sample from Cuba falls into the group dominated by (E)-nerolidol, the sample from Nepal is a davanone chemotype, and the sample from Yemen belongs to the β-caryophyllene chemotype. The chemical composition of L. camara oil plays a role in the biological activity; the β-caryophyllene and (E)-nerolidol chemotypes showed antimicrobial and cytotoxic activities. © 2016 Verlag Helvetica Chimica Acta AG, Zürich.

  3. Impact of Lantana camara in the Indian society

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    Reshmi Chatterjee

    2015-06-01

    Full Text Available Lantana camara, an introduced species by the British has turned itself in to a noxious weed, which has expanded itself in almost all the possible habitats of India. It is a major threat to the ecosystem, including plants and animals. Attempt to combat the further spread of this nuisance species has been of little help. Therefore, in the present discussion an attempt on its impact, toxicity, uses and therapeutic properties have been discussed. A carefully knitted plan should be framed emphasizing on exploiting this species economically as well as on taming the present threat so that the Indian society can be benefitted by properly utilizing the plant and thereby also conserve the ecosystem with its bio resources. The present review paper focuses on the various benefitting sides of the Lantana that would create better livelihood opportunities. DOI: http://dx.doi.org/10.3126/ije.v4i2.12663 International Journal of Environment Vol.4(2 2015: 348-354

  4. Temperature variation in pulp chamber during dental bleaching in presence or absence of light activation = Variação da temperatura na câmara pulpar durante o clareamento dental na presença ou ausência de fotoativação

    Directory of Open Access Journals (Sweden)

    Mollica, Fernanda Brandão

    2010-01-01

    Full Text Available Objetivo: Além da agressão química devido à penetração dos géis clareadores na polpa durante o clareamento de dentes com vitalidade pulpar, outro possível fator agressor pode ser o calor gerado pela reação de oxidação exotérmica do gel clareador, que pode também ser agravada pela fotoativação. Este estudo avaliou a variação da temperatura na câmara pulpar de dentes humanos, utilizando-se três diferentes géis clareadores, com ou sem fotoativação. Metodologia: Trinta pré-molares humanos foram cortados longitudinalmente para obtenção de duas metades: vestibular e lingual. Os 60 espécimes foram divididos em 3 grupos e os agentes clareadores utilizados variaram como segue: peróxido de hidrogênio 35% (WHP, peróxido de carbamida 37% (W e peróxido de hidrogênio 38% (OX. Metade dos espécimes foi submetida ao clareamento com fotoativação e, a outra metade, sem fotoativação. A fonte de luz utilizada foi o aparelho à base de diodo emissor de luz (LED, 3-Light, Clean Line e as temperaturas foram medidas por um termômetro digital. Os dados foram analisados por análise de variância e teste de Tukey (alfa=5%. Resultados: Os resultados de temperatura foram: sem fotoativação (WHP= 0. 68b; W= 0. 40b; OX= 0. 48b; com fotoativação (WHP= 2. 35a; W= 1. 60a; OX= 1. 80a. Conclusão: A fotoativação dos géis clareadores com LED contribuiu para um maior aumento de temperatura na câmara pulpar, mas não se atingiu a temperatura crítica de 5,5oC

  5. Patologías pulpares y periapicales más frecuentes en urgencias en 2 clínicas estomatológicas

    OpenAIRE

    Dinhora Quiñones Márquez

    2000-01-01

    Las patologías pulpares y periapicales son unas de las enfermedades que más llevan a los pacientes a acudir a una consulta de urgencia estomatológica debido a su sintomatología. Es de gran importancia realizar un correcto diagnóstico en este momento para brindar la terapeútica adecuada.La frecuencia de estas patologías en consulta de urgencia fue lo que nos motivó a la realización de este trabajo, el cual tuvo entre sus objetivo contribuir al conocimiento de las patologías pulpares y periapic...

  6. Importancia de la semiología del dolor en el diagnóstico de un proceso inflamatorio pulpar

    Directory of Open Access Journals (Sweden)

    Andrés 0 Pérez Ruiz

    2011-09-01

    Full Text Available El dolor es un síntoma de extraordinaria importancia en la práctica estomatológica y particularmente en lo concerniente a las alteraciones de la pulpa dentaria. Con el objetivo de profundizar en el conocimiento de las fases por las que atraviesa un proceso inflamatorio pulpar, que permiten predecir sus manifestaciones dolorosas, se realizó una revisión bibliográfica sobre el tema con un enfoque multidisciplinario y básico-clínico. Se utilizó el método documental para el análisis y tratamiento de la información ofrecida por las fuentes teóricas. El sitio en Internet Google fue empleado como fundamental motor de búsqueda y Lilacs, Hinari, Medline y PubMed fueron las bases de datos más revisadas. La clasificación del estado de inflamación pulpar, que atiende a eventos histopatológicos que no se pueden visualizar, resulta más difícil. Se podría lograr mayor precisión en un diagnóstico basado en el curso que sigue el dolor, de acuerdo a la magnitud del compromiso inflamatorio y apoyado en la rica semiología que se puede obtener si se sigue la trayectoria de las variables del estímulo nociceptivo. El incremento y profundización de los conocimientos en este campo contribuiyó significativamente a un mejor diagnóstico y tratamiento de los procesos inflamatorios pulpares.

  7. Efectos de los destartaradores de ultrasonidos sobre la vitalidad pulpar en los dientes del perro. Estudio Experimental

    OpenAIRE

    Vérez Fraguela, José Luis

    2013-01-01

    Se plantea el estudio de las posibles lesiones pulpares inducidas por ultrasonidos de 29 KHz, que son los utilizados en la clínica. Se utilizaron 84 premolares, a los que se aplicaron los ultrasonidos durante 30, 60 y 90 segundos, a la par que se tomaba la temperatura de la pulpa dental, para ver su hipotético incremento. Además de las valoraciones cualitativas de las variaciones de temperatura, se realizaron estudios macroscópicos e histológicos para determinar la presencia de posi...

  8. Etiología, clasificación y patogenia de la patología pulpar y periapical

    OpenAIRE

    López Marcos, Joaquín Francisco

    2004-01-01

    En la actualidad, gran parte de los tratamientos que se realizan en la clínica son debidos a patologías que afectan a la pulpa y al periápice. La pulpa es un tejido ricamente vascularizado e inervado, delimitado por un entorno inextensible como es la dentina, con una circulación sanguínea terminal y con una zona de acceso circulatorio –periápice– de pequeño calibre. Todo ello, hace que la capacidad defensiva del tejido pulpar sea muy limitada ante las diversas agresiones que pueda sufrir. ...

  9. Bioactivity of Lantana camara L. essential oil against Callosobruchus maculatus (Fabricius Bioactividad de aceite esencial de Lantana camara L. contra Callosobruchus maculatus (Fabricius

    Directory of Open Access Journals (Sweden)

    Nooshin Zandi-Sohani

    2012-12-01

    Full Text Available Lantana camara L. is a widespread plant species mostly native to subtropical and tropical regions of the world. In this study, insecticidal and repellent activities of L. camara essential oil were evaluated against Callosobruchus maculatus (Fabricius (Col: Bruchidae. Analysis of chemical composition by gas chromatography/mass spectrometry (GC/MS showed high amounts of sesquiterpenes, mainly α-humelene (23.3% and cis-caryophyllene (16.2%. The results showed that the essential oil of L. camara has strong repellent activity against adults of C. maculatus at all tested concentrations. After 2 and 4 h, 97.4 and 100% repellency was seen at highest concentrations of 0.4 μL cm-2, respectively. Moreover, the oil was found to be toxic to adults when applied by fumigation. Responses varied with the gender of insect and exposure time. The LC50 values were 282.7 and 187.9 μL L-1 for females and males, respectively. An increase in the exposure time from 3 to 24 h caused increasing in mortality from 23.6 to 100% in males and from 14.1 to 97.1% in females, at highest concentration (1160 μL L-1. According to these results, L. camara essential oil may be useful as an alternative for bean protection against C. maculatus.Lantana camara L. es una especie vegetal nativa de las regiones subtropicales y tropicales del mundo. En este estudio se evaluaron las actividades insecticida y repelente del aceite esencial de L. camara contra Callosobruchus maculatus (Fabricius. El análisis de la composición volátil de este aceite esencial mediante cromatografía de gas/ espectrometría de masa (GC/MS demostró la presencia de elevadas cantidades de sesquiterpenos, principalmente α-humuleno (23.3% y ci's-cariofileno (16.2%. Los resultados obtenidos demostraron que el aceite esencial de L. camara tiene una elevada actividad repelente contra los adultos de C. maculatus a todas las concentraciones ensayadas. Después de 2 y 4 h la concentración de 0.4 μL cm-2 causó 97

  10. High alpha cellulose from fast growing species such as Lantana camara (linn) and Hibiscus cannabinus

    Energy Technology Data Exchange (ETDEWEB)

    Manavalan, R.; Mithal, B.M.; Anand, S.M.; Chawla, J.S.

    1980-01-01

    Prehydrolysis of L. camara and kenaf with H/sub 2/O at 165 degrees, and kraft cooking gave pulp in 28-40% yield, and permanganate number 8.5-12. Bleaching of the pulps from these species by CEHED sequence gave products in 26-41% yield, and with 83-90% brightness.

  11. Climate change and the potential distribution of an invasive shrub, Lantana camara L.

    Directory of Open Access Journals (Sweden)

    Subhashni Taylor

    Full Text Available The threat posed by invasive species, in particular weeds, to biodiversity may be exacerbated by climate change. Lantana camara L. (lantana is a woody shrub that is highly invasive in many countries of the world. It has a profound economic and environmental impact worldwide, including Australia. Knowledge of the likely potential distribution of this invasive species under current and future climate will be useful in planning better strategies to manage the invasion. A process-oriented niche model of L. camara was developed using CLIMEX to estimate its potential distribution under current and future climate scenarios. The model was calibrated using data from several knowledge domains, including phenological observations and geographic distribution records. The potential distribution of lantana under historical climate exceeded the current distribution in some areas of the world, notably Africa and Asia. Under future scenarios, the climatically suitable areas for L. camara globally were projected to contract. However, some areas were identified in North Africa, Europe and Australia that may become climatically suitable under future climates. In South Africa and China, its potential distribution could expand further inland. These results can inform strategic planning by biosecurity agencies, identifying areas to target for eradication or containment. Distribution maps of risk of potential invasion can be useful tools in public awareness campaigns, especially in countries that have been identified as becoming climatically suitable for L. camara under the future climate scenarios.

  12. Green synthesis and characterization of silver nanoparticles using Lantana camara leaf extract

    International Nuclear Information System (INIS)

    Ajitha, B.; Ashok Kumar Reddy, Y.; Sreedhara Reddy, P.

    2015-01-01

    In this work, we have investigated on Lantana camara mediated silver nanoparticles (AgNPs) with different leaf extract (LE) quantity for the evaluation of efficient bactericidal activity. The AgNPs were prepared by simple, capable, eco-friendly and biosynthesis method using L. camara LE. This method allowed the synthesis of crystalline nanoparticles, which was confirmed by X-ray diffraction (XRD) and selected area electron diffraction (SAED) patterns. The X-ray photoelectron spectroscopy (XPS) analysis confirmed the formation of metallic silver and elucidates the surface state composition of AgNPs. UV–vis spectra of AgNPs and visual perception of brownish yellow color from colorless reaction mixture confirmed the AgNP formation. Involvement of functional groups of L. camara leaf extract in the reduction and capping process of nanoparticles was well displayed in Fourier transform infrared spectroscopy (FTIR). Decrement of particle size with an increment of leaf extract volume was evident in AFM, TEM images and also through a blue shift in the UV–vis spectra. The rate of formation and size of AgNPs were dependent on LE quantity. Meanwhile, these AgNPs exhibited effective antibacterial activity with the decrement of particle size against all tested bacterial cultures. - Highlights: • Monodispersed AgNPs are synthesized using L. camara leaf extract. • The higher the L. camara content, the smaller the particle size. • Green synthesized AgNPs are found to be photoluminescent. • Size dependence of antibacterial activity is reported. • The nanoparticle stability is improved by leaf extract quantity

  13. Green synthesis and characterization of silver nanoparticles using Lantana camara leaf extract

    Energy Technology Data Exchange (ETDEWEB)

    Ajitha, B., E-mail: ajithabondu@gmail.com [Department of Physics, Sri Venkateswara University, Tirupati 517502 (India); Ashok Kumar Reddy, Y. [Department of Electrical Engineering, Korea Advanced Institute of Science and Technology, 335 Gwahangno, Yuseong-gu, Daejeon 305-701 (Korea, Republic of); Sreedhara Reddy, P. [Department of Physics, Sri Venkateswara University, Tirupati 517502 (India)

    2015-04-01

    In this work, we have investigated on Lantana camara mediated silver nanoparticles (AgNPs) with different leaf extract (LE) quantity for the evaluation of efficient bactericidal activity. The AgNPs were prepared by simple, capable, eco-friendly and biosynthesis method using L. camara LE. This method allowed the synthesis of crystalline nanoparticles, which was confirmed by X-ray diffraction (XRD) and selected area electron diffraction (SAED) patterns. The X-ray photoelectron spectroscopy (XPS) analysis confirmed the formation of metallic silver and elucidates the surface state composition of AgNPs. UV–vis spectra of AgNPs and visual perception of brownish yellow color from colorless reaction mixture confirmed the AgNP formation. Involvement of functional groups of L. camara leaf extract in the reduction and capping process of nanoparticles was well displayed in Fourier transform infrared spectroscopy (FTIR). Decrement of particle size with an increment of leaf extract volume was evident in AFM, TEM images and also through a blue shift in the UV–vis spectra. The rate of formation and size of AgNPs were dependent on LE quantity. Meanwhile, these AgNPs exhibited effective antibacterial activity with the decrement of particle size against all tested bacterial cultures. - Highlights: • Monodispersed AgNPs are synthesized using L. camara leaf extract. • The higher the L. camara content, the smaller the particle size. • Green synthesized AgNPs are found to be photoluminescent. • Size dependence of antibacterial activity is reported. • The nanoparticle stability is improved by leaf extract quantity.

  14. Pulpar temperature changes during mechanical reduction of equine cheek teeth: comparison of different motorised dental instruments, duration of treatments and use of water cooling.

    Science.gov (United States)

    O'Leary, J M; Barnett, T P; Parkin, T D H; Dixon, P M; Barakzai, S Z

    2013-05-01

    Although equine motorised dental instruments are widely used, there is limited information on their thermal effect on teeth. The recently described variation in subocclusal secondary dentine depth overlying individual pulp horns may affect heat transmission to the underlying pulps. This study compared the effect of 3 different equine motorised dental instruments on the pulpar temperature of equine cheek teeth with and without the use of water cooling. It also evaluated the effect of subocclusal secondary dentine thickness on pulpar temperature changes. A thermocouple probe was inserted into the pulp horns of 188 transversely sectioned maxillary cheek teeth with its tip lying subocclusally. Pulpar temperature changes were recorded during and following the continuous use of 3 different equine motorised dental instruments (A, B and C) for sequential time periods, with and without the use of water cooling. Using motorised dental instrument B compared with either A or C increased the likelihood that the critical temperature was reached in pulps by 8.6 times. Compared with rasping for 30 s, rasping for 45, 60 and 90 s increased the likelihood that the critical temperature would be reached in pulps by 7.3, 8.9 and 24.7 times, respectively. Thicker subocclusal secondary dentine (odds ratio [OR] = 0.75/mm) and water cooling (OR = 0.14) were both protective against the likelihood of the pulp reaching the critical temperature. Prolonged rasping with motorised dental instruments increased the likelihood that a pulp would be heated above the critical temperature. Increased dentinal thickness and water cooling had protective roles in reducing pulpar heating. Motorised dental instruments have the potential to seriously damage equine pulp if used inappropriately. Higher speed motorised dental instruments should be used for less time and teeth should be water cooled during or immediately after instrument use to reduce the risk of thermal pulpar damage. © 2012 EVJ Ltd.

  15. Evaluation of the temperature rise in pulp chamber during class V preparation with Er:YAG laser; Avaliacao da temperatura na camara pulpar durante preparo classe V com laser de Erbio:YAG

    Energy Technology Data Exchange (ETDEWEB)

    Picinini, Leonardo Santos

    2001-07-01

    One of the major concerns regarding laser irradiation in the dentistry field is the overheating in dental tissue, specially pulpal tissue. A temperature raise over 5.5 deg C is considered to be harmful to its vitality. The current study evaluated the temperature increase in the pulp chamber, during class V preparation, performed with the laser Er:YAG in 36 bovine incisive extracted teeth. The samples were eroded on the outer side of the vestibular wall to obtain the dentinal thickness of 2.0 mm (group I), 1.0 mm (group II) and 0.5 mm (group III). Thermocouples were fixed to the inner part of the vestibular wall using thermal paste, through the palatine opening of the samples. Class V cavities were prepared in the vestibular side only in 1 mm{sup 2} thick dentins. Irradiation parameters used were: 500 mJ/10 Hz, 850 mJ/10 Hz and 1 000 mJ/10 Hz for all the groups. The results were processed by a microcomputer. This study showed that the temperature increased into the pulpal cavity reached around 3 deg C for the groups I (2,0 mm thick dentine) and II (1.0 mm thick dentine). In the group III (0.5 mm thick) temperature was around 5.5 deg C. Thus, the parameters used for cavity preparation, using Er:YAG laser, were safe in relation to the temperature raise for dentinal thickness of 1,0 and 2,0 mm; in 0.5 mm thick dentins, temperature increase reached 5.5 deg C and an appropriate correction in the laser parameters was necessary. (author)

  16. Evaluation in vitro of pulpal chamber temperature of deciduous teeth during Er:YAG laser application; Avaliacao in vitro da temperatura na camara pulpar de dentes deciduos durante aplicacao do laser de Er:YAG

    Energy Technology Data Exchange (ETDEWEB)

    Sznajder, Alexandre Joseph

    2001-07-01

    The Er:YAG laser technology has been thoroughly studied, since its invention, and has been increasingly recommended in Dentistry. However, its use in deciduous teeth has not been deserving the equivalent attention to its counterpart in permanent teeth, despite of the deciduous teething occur in a phase of life in which it has a far more importance than its substitutes. For that reason, this study aims to identify the suitable parameters to the clinic procedures in deciduous teeth, using the already established protocols in permanent teeth. The study was lead in a way to resemble the most the conditions of the clinical use of the laser. Five groups were analyzed using different energy densities and repetition rates. Each group was composed of 10 first superior right deciduous molars randomly selected. The energy densities and repetition rates used for each group were: 60 mJ 15 Hz, 250 mJ 2 Hz, 250 mJ 15 Hz, 400 mJ 6 Hz and 500 mJ 2 Hz. The results obtained allowed us to conclude that the use of the Er:YAG laser in Odontopediatrics is effective, safe and secure and the main reason for its recommendation is the low transfer of heat to the adjacent tissues of the applied surfaces. (author)

  17. Un nuevo protocolo de medicación intraconducto para dientes con necrosis pulpar y rizogénesis incompleta

    OpenAIRE

    Soares, Adriana de Jesus; Lima, Thiago Farias Rocha; Lins, Fernanda Freitas; Herrera Morante, Daniel Rodrigo; Gomes, Brenda Paula Figueiredo de Almeida; Souza-Filho, Francisco José de

    2014-01-01

    El trauma tiene un serio impacto en el desarrollo de la dentición de niños y jóvenes, pudiendo resultar en necrosis del diente permanente joven. El tratamiento más común para los casos de necrosis pulpar en dientes con rizogénesis incompleta es promover la apexificación. Esteartículo presenta el reporte de un caso clínico donde fue utilizada una medicación intraconducto (MIC) compuesta por la asociación de hidróxido de calcio, clorhexidina gel al 2% y óxido de zinc (2:1:2) para promover la fo...

  18. Adulticidal activity of essential oil of Lantana camara leaves against mosquitoes.

    Science.gov (United States)

    Dua, V K; Pandey, A C; Dash, A P

    2010-03-01

    Development of insect resistance to synthetic pesticides, high operational cost and environmental pollution have created the need for developing alternative approaches to control vector-borne diseases. In the present study we have investigated the insecticidal activity of essential oil isolated from the leaves of Lantana camara against mosquito vectors. Essential oil was isolated from the leaves of L. camara using hydro-distillation method. Bioassay test was carried out by WHO method for determination of adulticidal activity against mosquitoes. Different compounds were identified by gas chromatography-mass spectrometry analysis. LD(50) values of the oil were 0.06, 0.05, 0.05, 0.05 and 0.06 mg/cm(2) while LD(90) values were 0.10, 0.10, 0.09, 0.09 and 0.10 mg/cm(2) against Ae. aegypti, Cx. quinquefasciatus, An. culicifacies, An. fluvialitis and An. stephensi respectively. KDT(50) of the oil were 20, 18, 15, 12, and 14 min and KDT(90) values were 35, 28 25, 18, 23 min against Ae. aegypti, Cx. quinquefasciatus, An. culicifacies, An. fluviatilis and An. stephensi, respectively on 0.208 mg/cm(2) impregnated paper. Studies on persistence of essential oil of L. camara on impregnated paper revealed that it has more adulticidal activity for longer period at low storage temperature. Gas chromatographic-mass spectrometric analysis of essential oil showed 45 peaks. Caryophyllene (16.37%), eucalyptol (10.75%), alpha-humelene (8.22%) and germacrene (7.41%) were present in major amounts and contributed 42.75 per cent of the total constituents. Essential oil from the leaves of L. camara possesses adulticidal activity against different mosquito species that could be utilized for development of oil-based insecticide as supplementary to synthetic insecticides.

  19. Chemical constituents and evaluation of cytotoxic and antifungal activity of Lantana camara essential oils

    Directory of Open Access Journals (Sweden)

    Lídia B. P. Medeiros

    2012-12-01

    Full Text Available The essential oil (EO of aerial parts of Lantana camara L., Verbenaceae, from Simões, Piaui, Northeast of Brazil, were obtained by hydrodistillation and analyzed by GC-FID and GC-MS techniques. In total, 68 compounds were identified. The most representative compounds of the oil were mono and sesquiterpenes. The main compounds found in the oil of the leaves in different months were β-caryophyllene (10.5%, in June of 2009, sabinene (7.98%, in September of 2008, limonene (7.68%, in September of 2008, spathulenol (11.64%, in September of 2008. The oil from stems of L. camara was characterized by a largest amount of sesquiterpenoids, with spatulenol (15.9% and caryophyllene oxide (17.1% in June of 2009, as main components. β-Gurjunene (32.7%, in September of 2008 was the most prominent compound in the stems oils, which was absent or at very low relative abundance in leaves. L. camara essential oils from leaves were cytotoxic to V79 mammalian cells and also to Artemia salina, showing 50% lethal concentration (LC50 values from 0.23 µg/mL. The in vitro data obtained in this study suggested that EO may also be effective treating yeast infection in patients infected with fluconazole and terbinafine resistant isolates, but its toxicity must be monitored carefully.

  20. Chemical constituents and evaluation of cytotoxic and antifungal activity of Lantana camara essential oils

    Directory of Open Access Journals (Sweden)

    Lídia B. P. Medeiros

    2012-08-01

    Full Text Available The essential oil (EO of aerial parts of Lantana camara L., Verbenaceae, from Simões, Piaui, Northeast of Brazil, were obtained by hydrodistillation and analyzed by GC-FID and GC-MS techniques. In total, 68 compounds were identified. The most representative compounds of the oil were mono and sesquiterpenes. The main compounds found in the oil of the leaves in different months were β-caryophyllene (10.5%, in June of 2009, sabinene (7.98%, in September of 2008, limonene (7.68%, in September of 2008, spathulenol (11.64%, in September of 2008. The oil from stems of L. camara was characterized by a largest amount of sesquiterpenoids, with spatulenol (15.9% and caryophyllene oxide (17.1% in June of 2009, as main components. β-Gurjunene (32.7%, in September of 2008 was the most prominent compound in the stems oils, which was absent or at very low relative abundance in leaves. L. camara essential oils from leaves were cytotoxic to V79 mammalian cells and also to Artemia salina, showing 50% lethal concentration (LC50 values from 0.23 µg/mL. The in vitro data obtained in this study suggested that EO may also be effective treating yeast infection in patients infected with fluconazole and terbinafine resistant isolates, but its toxicity must be monitored carefully.

  1. Pathological investigation of caries and occlusal pulpar exposure in donkey cheek teeth using computerised axial tomography with histological and ultrastructural examinations.

    Science.gov (United States)

    Toit, Nicole du; Burden, Faith A; Kempson, Sue A; Dixon, Padraic M

    2008-12-01

    Post-mortem examination of 16 donkey cheek teeth (CT) with caries (both peripheral and infundibular) and pulpar exposure were performed using computerised axial tomography (CAT), histology and scanning electron microscopy. CAT imaging was found to be useful to assess the presence and extent of caries and pulp exposure in individual donkey CT. Histology identified the loss of occlusal secondary dentine, and showed pulp necrosis in teeth with pulpar exposure. Viable pulp was present more apically in one exposed pulp horn, with its occlusal aspect sealed off from the exposed aspect of the pulp horn by a false pulp stone. Scanning electron microscopy showed the amelo-cemental junction to be a possible route of bacterial infection in infundibular cemental caries. The basic pathogenesis of dental caries in donkeys appears very similar to its description in other species.

  2. Descripción de las propiedades funcionales del sistema nociceptivo trigeminal en relación con el dolor pulpar

    Directory of Open Access Journals (Sweden)

    Andrés O Pérez Ruíz

    Full Text Available El sistema trigeminal nociceptivo es un componente del sistema sensorial somestésico que tiene la capacidad de discriminar cuatro variables básicas de los estímulos que provocan daño tisular, ellas son: cualidad, curso temporal, localización e intensidad. Las fibras A delta y C, vinculadas a la nocicepción están presentes en la pulpa dental. Se utilizan varias clasificaciones del dolor, atendiendo a diversos criterios: calidad de la sensación, velocidad de transmisión por las fibras, en relación con el lugar del cuerpo donde se exprese, y a la ubicación del nociceptor. La evolución de las condiciones pulpares se clasifican como: pulpitis reversible, pulpitis transicional, pulpitis irreversible y pulpa necrótica.Según su cualidad, el dolor pulpar puede ser punzante o continuo; atendiendo a su aparición, provocado o espontáneo; por su curso, intermitente o continuo; por su localización puede ser limitado a una región, irradiado y referido; y en relación con su intensidad se considera leve, moderado o severo. La capacidad del sistema sensorial nociceptivo en cuanto a discriminar la modalidad, curso temporal, localización e intensidad del estímulo, permite conocer las diferentes etapas de un proceso inflamatorio pulpar.

  3. MTA and calcium hydroxide for pulp capping MTA e hidróxido de cálcio para proteção pulpar direta

    Directory of Open Access Journals (Sweden)

    Alexandra Mussolino de Queiroz

    2005-06-01

    Full Text Available This study evaluated the biocompatibility of mineral trioxide aggregate (MTA after direct capping of exposed pulp tissue in dog's teeth. Class I cavities were prepared in 26 teeth from 3 adult dogs. MTA was applied over the exposed pulp in 13 teeth and paste of calcium hydroxide plus distilled water (control was applied in the remaining 13 teeth. After 90 days, the animals were killed; the maxilla and mandible were dissected and sectioned to obtain individual roots. The samples were processed histologically. The pulp and periapical response observed with the use of MTA was similar to that of calcium hydroxide paste. In all specimens, there was a dentin bridge obliterating the exposure, an intact odontoblastic layer, no inflammatory cells, normal connective pulp tissue, normal apical and periapical regions and no bone tissue changes. Similar to calcium hydroxide, MTA presented excellent response when used for direct pulp capping.O objetivo deste trabalho foi avaliar a biocompatibilidade do agregado de trióxido mineral (MTA, após proteção pulpar direta em dentes de cães. Foram preparadas cavidades de Classe I, em 26 dentes de 3 cães adultos. O MTA foi aplicado sobre 13 dentes e a pasta de hidróxido de cálcio (grupo controle foi aplicada sobre os 13 dentes remanescentes. Após 90 dias, os animais foram mortos, a maxila e a mandíbula foram dissecadas e os dentes foram seccionados para obtenção de raízes individualizadas. Os espécimes foram processados histologicamente. A resposta do tecido pulpar e periapical foi semelhante para o MTA e o hidróxido de cálcio. Em todos os espécimes havia ponte de dentina obliterando o local da exposição pulpar, camada odontoblástica íntegra, ausência de células inflamatórias, tecido pulpar normal, e ausência de alterações na região periapical e óssea. Da mesma maneira que o hidróxido de cálcio, o MTA apresentou excelente biocompatibilidade quando usado para proteção pulpar direta.

  4. Vitalidade pulpar em dentes portadores de brackets ortodônticos: apresentação de uma técnica = Pulp vitality test on teeth having orthodontics brackets: technique presentation

    Directory of Open Access Journals (Sweden)

    Barletta, Fernando Branco

    2007-01-01

    Full Text Available O presente trabalho teve como objetivo avaliar a confiabilidade do teste de vitalidade pulpar com o gás refrigerante tetrafluoretano (CS 68 em dentes portadores de brackets ortodônticos. Foram selecionados 37 pacientes de clínica privada, com faixa etária entre 12 e 60 anos de idade. O teste de vitalidade pulpar foi realizado na face palatina ou lingual, na região de terço médio dos dentes, abaixo do cíngulo, nos grupos dentários dos incisivos, caninos e pré-molares superiores e inferiores, totalizando 402 dentes. Quando a resposta de sensibilidade pulpar era negativa ao teste, o mesmo era repetido; confirmando-se o resultado como negativo, realizavase uma tomada radiográfica pela técnica periapical do dente em questão. Os resultados evidenciaram 4 elementos dentários com resposta negativa ao teste de vitalidade pulpar, sendo 3 pré-molares e um incisivo central. A resposta dos demais foi positiva ao teste. Diante dos resultados, verificou-se que a aplicação do teste de vitalidade pulpar pela face palatina em pacientes portadores de brackets ortodônticos constitui-se em uma alternativa segura e confiável

  5. The toxicity evaluation of prepared Lantana camara nano extract against Spodoptera litura (Lepidoptera: Noctuidae)

    Science.gov (United States)

    Kasmara, Hikmat; Melanie, Nurfajri, Dea Audia; Hermawan, Wawan; Panatarani, Camellia

    2018-02-01

    Nanotechnology plays an important role in providing opportunities and possibilities for the development of a plant extracts, particularly applied for agriculture using the organic nanoparticles extract as bioinsecticide. This paper reports the extraction of L. camaraas an insecticidal compound applied to control the S. litura larvae which is the main pest for agricultural commodities in Indonesia. The objective of this research is to evaluate the toxicity performance of nano extract to S. litura larvae. The extract was prepared by maceration and evaporation and followed by particles stabilization. The received suspension was characterized using a Particles Size Analyzer (PSA). The performance evaluation was conducted using dye feed method by observing at 24 h and 48 h. The toxicity performance of L. camara nano extract on S. litura larvae was evaluated based on the lethal concentration which was obtained at 50% of 3rd instar larvae S. litura (LC50) and the toxicity level. The larval mortality data was analyzed by probit analysis to obtain LC50 values. The results showed that the LC50 value of L. camara nano extract after 24 h was 16,347 ppm and after 48 h the LC50 value was 3,548 ppm. The smaller LC50 values indicate a stronger toxicity level, in contrast the best toxicity was LC50 after 48 h with the concentration of 3,548 ppm. Referring to toxicity category standard with LC50 pesticide value, the range 0.5-5 g/L is considered as medium toxic category. Toxicity level of L. camara nano extract to S. litura 3,548 ppm or 3,548 mg/L is considered as medium toxic category.

  6. Antinociceptive and anti-inflammatory effects of Lantana camara L. extract in mice

    Directory of Open Access Journals (Sweden)

    T.S.C. SILVA

    2015-06-01

    Full Text Available ABSTRACT:he Lantana camara L. belongs to the family Verbenaceae, which contains several active compounds in leaves and roots and which are reported to have medicinal and insecticidal properties. Studies of plants within the same family show the existence of anti-inflammatory activity in paw edema induced by carrageenan, serotonin and histamine and analgesic activity in the acetic acid writhing and tail-flick tests. The present study investigated whether the L. camara extract (ACE also exerts these effects. The ACE toxicity was studied in male mice, and the percentage of mortality recorded 7 days after treatment was assessed. The ACE was evaluated as an antinociceptive agent in the hot plate, tail-flick and acetic acid writhing tests at a nontoxic dose of 1.0 g/Kg. The results showed that 1.5 g/Kg of ACE was not able to cause death, and doses of 3.0 and 4.0 g/Kg caused 50% and 60% death, respectively, in male mice. In all of the antinociceptive tests, 1 g/Kg of ACE markedly reduced responses to pain. Our findings suggest that ACE may have active anti-inflammatory and antinociceptive properties in much smaller doses than toxic.

  7. EFICACIA DE LA PREPARACIÓN BIOMECÁNICA DE CONDUCTOS RADICULARES EN EL CRECIMIENTO MICROBIOLÓGICO EN PIEZAS DENTARIAS ANTERIORES CON NECROSIS PULPAR EN PACIENTES DE LA CLÍNICA ODONTOLÓGICA UANCV. JULIACA, PUNO. 2013

    OpenAIRE

    TAPIA CONDORI, RILDO PAÚL

    2015-01-01

    RESULTADOS TABLAS DE INFORMACIÓN GENERAL TABLAS QUE RESPONDEN A LOS OBJETIVOS MICROBIOLOGÍA ENDODÓNTICA VÍAS MICROBIANAS DE ACCESO TÚBULOS DENTINARIOS CAVIDAD ABIERTA MEMBRANA PERIODONTAL REQUERIMIENTOS PARA UN PATÓGENO ENDODÓNTICO POTENCIAL DE OXIDO-REDUCCIÓN ANTAGÓNICOS INTERMICROBIANOS NECROSIS PULPAR TIPOS DE NECROSIS PREPARACIÓN BIOMECÁNICA EN PIEZAS CON NECROSIS PULPAR INSTRUMENTOS CONVENCIONALES DE ACERO INOXIDABLE CARACTERÍSTICAS DE LAS LIMAS K DE ACERO INOXIDABLE PROPIEDADES FÍSICAS ...

  8. Uso de novos materiais para o capeamento pulpar (hidroxiapatita - HAp e fosfato tricálcico - β-TCP The use of new materials for pulp capping (hydroxyapatite - HAp and tricalcium phosphate - β-TCP

    Directory of Open Access Journals (Sweden)

    C. S. Delfino

    2010-12-01

    Full Text Available O capeamento pulpar é uma medida importante e muito usada no cotidiano da prática odontológica e, quando realizado de forma consciente, baseado em um bom diagnóstico da condição pulpar no momento da exposição, pode prevenir o dente de sofrer uma intervenção endodôntica. Além do hidróxido de cálcio, outros materiais vêm sendo testados quanto a sua ação em promover o reparo pulpar pela formação de ponte de dentina, após capeamento pulpar direto. Uma das alternativas de materiais viáveis para o capeamento pulpar são as cerâmicas à base de fosfatos de cálcio, destacando-se a hidroxiapatita (HAp e o fosfato tricálcico (β-TCP. Estes materiais não promovem a formação de área necrótica, característica da utilização do hidróxido de cálcio, são biocompatíveis e favorecem o reparo do tecido pulpar. Para avaliar os efeitos desses materiais no capeamento pulpar foi realizada esta revisão de literatura, abordando desde a resposta do tecido pulpar, até o protocolo para o uso clínico.Pulp capping is an important measure and one with a high rate of use in daily dental practice, and when it is conscientiously performed, based on good diagnosis of the pulp condition at the time of its exposure, it may prevent the tooth from requiring endodontic intervention. In addition to calcium hydroxide, other materials have been tested with regard to their action in promoting pulp repair by the formation of a dentin bridge after direct pulp capping. Some of the feasible alternative materials for pulp capping are calcium phosphate-based ceramics, with hydroxyapatite (HAp and tricalcium phosphate (β-TCP being outstanding. These materials do not promote formation of a necrotic area, characteristic of the use of calcium hydroxide, are biocompatible and favor pulp tissue repair. To evaluate the effects of these materials on pulp capping, this literature review was conducted, the approach being wide ranging in scope, from pulp response

  9. Valoración histológica de la respuesta pulpar y hepática del formocresol y el hueso liofilizado en dientes de rata.

    OpenAIRE

    Alcaina Lorente, Mª Antonia

    2003-01-01

    Son varios los agentes que se han utilizado para las pulpotomías en dientes primarios, siendo el formocresol el más difundido. El objetivo de este estudio fue evaluar la respuesta pulpar en dientes de rata cuando el hueso liofilizado es usado como agente de pulpotomía y analizar los cambios histológicos del tejido hepático. La muestra de este estudio estaba formada por 60 ratas de raza Sprague-Dawley. El tratamiento se realizó en los primeros molares superiores, siendo un total de 120 d...

  10. Alternativas de medicação intracanal em casos de necrose pulpar com lesão periapical = Intracanal medication indicated for pulpal necrosis with apical osteites

    OpenAIRE

    Fachin, Elaine Vianna Freitas

    2006-01-01

    Trata-se de estudo in vivo em pacientes portadores de dentes monorradiculares apresentando necrose pulpar com lesão periapical. O objetivo foi avaliar radiograficamente a efetividade de 4 diferentes curativos de demora (PMCC, gel de clorexidina 2%, pasta de hidróxido de cálcio e hipoclorito de sódio1%). O tratamento endodôntico foi padronizado em todos os elementos através da técnica escalonada e irrigação com hipoclorito de sódio 1%. Para a medicação intracanal, os pacientes foram separados ...

  11. WIND DIRECTION, pH and other data from ALMIRANTE CAMARA and ALMIRANTE SALDANHA from 1979-01-07 to 1979-12-11 (NODC Accession 8100468)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Water depth and other station data collected from ALMIRANTE CAMARA, ALMIRANTE SALDANHA and other Platforms for one year. The data was collected between January 7,...

  12. Negative effect of litter of invasive weed Lantana camara on structure and composition of vegetation in the lower Siwalik Hills, northern India.

    Science.gov (United States)

    Singh, Harminder Pal; Batish, Daizy R; Dogra, Kuldip Singh; Kaur, Shalinder; Kohli, Ravinder Kumar; Negi, Anjana

    2014-06-01

    Lantana camara, an aromatic shrub, native to tropical America, was introduced into India for ornamental hedging, but later escaped and became a serious invasive weed. This study assessed the quantitative and qualitative status of plant community richness and diversity in areas invaded by L. camara in the Siwalik Hills (Himachal Pradesh, India), and explored allelopathy as a possible mechanism of interference. We measured species diversity, richness and evenness of the vegetation in areas invaded and uninvaded by L. camara. Allelopathic effects of L. camara rhizosphere soil and litter were assessed against two native plants-Achyranthes aspera (a herb) and Albizia lebbeck (a tree). Density, biomass and indices of diversity, richness and evenness were reduced by L. camara, indicating a significant alteration in composition and structure of native communities. Seedling growth of the test species was reduced in L. camara rhizosphere- and litter-amended soil. The inhibitory effect was ameliorated by the addition of activated charcoal, indicating the presence of organic inhibitors (quantified as phenolics) in the soil. Lantana invasion greatly reduces the density and diversity of the vegetation in the invaded area, and chemical interference of its litter plays an important role in invasion.

  13. Scintillation camera and positron camera; Le scintillometre photographique; Stsintillyatsionnaya kamera; La camara de centelleo

    Energy Technology Data Exchange (ETDEWEB)

    Anger, Hal O; Rosenthal, Donald J [Lawrence Radiation Laboratory and Donner Laboratory of Biophysics and Medical Physics University of California, Berkeley, CA (United States)

    1959-07-01

    A short description is given of earlier forms of the gamma-ray camera. The principle of operation of the scintillation camera is reviewed. Here the locations of scintillations occurring in a flat thallium-activated sodium iodide crystal are determined from the amount of light picked up by a number of phototubes simultaneously viewing the crystal. The signals from the phototubes are fed to a deflection computor circuit which reproduces the scintillations on a cathode-ray tube screen. There they are photographed by a conventional scope camera. Examples are shown of the resolution now obtained as shown by test phantoms. A discussion is presented of the camera's use in visualizing the thyroid in clinical practice. (author) [French] Les auteurs donnent une breve description des gammametres photographiques employes anterieurement. Ils rappellent le principe du fonctionnement du scintillometre photographique. Cet appareil permet de localiser des scintillations emises par un cristal plat d'iodure de sodium active au thallium d'apres le flux lumineux capte par plusieurs cellules photoelectrique s placees devant le cristal. Des cellules photoelectriques, les signaux sont transmis a un circuit de comptage a deviation qui reproduit les scintillations sur l'ecran d'un tube a rayons cathodiques. Elles sont ensuite photographiees a l'aide d'un appareil ordinaire. Au moyen de , les auteurs donnent des exemples du pouvoir de resolution qu'il est possible d'obtenir maintenant. Ils etudient l'utilisation du dispositif pour la representation visuelle de la thyroide dans la pratique clinique. (author) [Spanish] El trabajo ofrece una breve description de las camaras de rayos gamma utilizadas anteriormente. Se pasa revista al principio de funcionamiento de la camara de centelleo. Ese aparato permite localizar los destellos emitidos por un cristal piano de yoduro de sodio activado por talio, en funcion del flujo luminoso captado por cierto numero de celulas fotoelectricas

  14. Suppression of thermal and chemical nociception in rats by methanol extract and its sub-fraction from lantana camara

    International Nuclear Information System (INIS)

    Simjee, S.U.; Perveen, H.; Zehra, S.Q.

    2016-01-01

    The traditional use of Lantana camara (Verbenaceae) is reported to include anti-nociceptive, antimicrobial, and immunosuppressant activity. To our knowledge no systematic study has been carried out on the anti-nociceptive activity of L. camara. The present study was designed to delineate the analgesic activity of L. camara extract and its fractions to elucidate the traditional belief in the painkilling effects. Experimental models employed were thermal and chemical-induced nociception assays. After initial screening of the methanol extract and its fractions prepared from the aerial parts of the plant, the dose of 50,100 and 200 mg/kg were selected and route of administration was i.p. The test samples were tested against a reference drug indomethacine (i.p. 5 mg/kg). The observations were made at 15, 30, 60, and 120 seconds following the administration of the samples or reference drug. Experiments on naloxone antagonism were conducted to determine involvement of opioid receptors. Compared to concurrent controls, a significant anti-nociceptive activity was observed in methanol extract LC (ED50 50 mg/kg, P < 0.002) and its sub-fractions LCEA-AQ (ED50 50 mg/kg, P < 0.004), LCEA (ED50 100 mg/kg, P < 0.004) and LCEA-PEI (ED50 100 mg/kg, P < 0.005). No apparent acute toxicity was observed in any test groups. The anti-nociceptive activity was not precipitated by naloxone antagonism indicating that these fractions do not act through opioid receptors. The methanol extract and active fractions of Lantana camara possess anti-nociceptive activity. Further investigations are needed to elucidate the mechanism of its action. (author)

  15. Regulating mineralization rates of Tithonia diversifolia and Lantana camara prunings to improve phosphorus availability in calcareous soils

    Directory of Open Access Journals (Sweden)

    Y. Nuraini

    2014-01-01

    Full Text Available The effect of mixing of Tithonia diversifolia and Lantana camara prunings to improve synchronization between P released from the prunings with crop demand for P was studied in a laboratory and in a glasshouse. Tithonia diversifolia prunings (Td, Lantana camara prunings (Lc, and farmyard manure (Pk were thoroughly mixed with the proportion (% of dry weight of; 25Td +75 Lc ; 50Td +50 Lc ; 75Td +25 Lc ; 90Lc +10 Pk ; 45Td +45 +10 Lc Pk ; 100Td and 100Lc, and then mixed with 100 g of air-dried soil with a rate equivalent to 100 kg P / ha. Results of the study showed that the pruning mixtures decomposed and mineralized faster than that of Lantana camara pruning only, but slower than that of Tithonia diversifolia pruning only. The amount of P released from the pruning mixtures increased with increasing proportion of Tithonia diversifolia pruning in the mixtures. Increasing proportion of Tithonia diversifolia pruning in the mixture applied to the soil increased the amount of P taken up by maize.

  16. Biomagnetic monitoring of particulate matter (PM through leaves of an invasive alien plant Lantana camara in an Indo-Burma hot spot region

    Directory of Open Access Journals (Sweden)

    Prabhat Kumar Rai

    2016-03-01

    Full Text Available Present study was performed in urban forests of Aizawl, Mizoram, North East India falling under an Indo-Burma hot spot region of existing ecological relevance and pristine environment. Phyto-sociolology of invasive weeds has been performed and results revealed that Lantana camara was the most dominant invasive weed. Further, the air quality studies revealed high suspended particulate matter (SPM as well as respirable suspended particulate matter (RSPM in ambient air of Aizawl, Mizoram, North East India. Bio-magnetic monitoring through plant leaves has been recognised as recent thrust area in the field of particulate matter (PM science. We aimed to investigate that whether magnetic properties of Lantana camara leaves may act as proxy of PM pollution and hence an attempt towards it's sustainable management. Magnetic susceptibility (χ, Anhyste reticremanent magnetization (ARM and Saturation isothermal remanent magnetization (SIRM of Lantana camara plant leaves were assessed and concomitantly correlated these magnetic properties with ambient PM in order to screen this invasive plant which may act as proxy for ambient PM concentrations. Results revealed high χ, ARM, SIRM of Lantana camara leaves and moreover, these parameters were having significant and positive correlation with ambient SPM as well as RSPM. Therefore, present study recommended the use of Lantana camara as bio-magnetic monitor which may further have sustainable management implications of an invasive plant.

  17. Factors influencing the local scale colonisation and change in density of a widespread invasive plant species, Lantana camara, in South India

    Directory of Open Access Journals (Sweden)

    Bharath Sundaram

    2015-04-01

    Full Text Available Identifying factors that underlie invasive species colonisation and change in density could provide valuable insights into the mechanisms of biological invasions and for invasive species management. We examined a suite of factors potentially influencing the landscape-level invasion of Lantana camara L., one of the most ubiquitous invasive species in South Asia. These factors included disturbance factors like forest fires, historical habitat modification, and edge effects, in addition to factors like propagule pressure and habitat suitability. We examined the relative importance of these factors on the colonisation and change in density of L. camara in the Biligiri Rangaswamy Temple Tiger Reserve, Western Ghats, India. We used extensive (1997–2008 datasets tracking the presence and abundance of L. camara and combined these with corresponding data on disturbances, propagule pressure, and habitat suitability. We used an information-theoretic model selection approach to determine the relative importance of each factor on the colonisation and change in density of L. camara. Colonisation was mainly a function of proximity to already established populations (i.e. propagule pressure, whereas increase in L. camara density appeared to be constrained by high fire frequency. Research and management efforts need to recognize the multi-dimensional nature of mechanisms underlying L. camara’s success during different invasion phases when strategizing interventions to mitigate its effects.

  18. Valorization of Toxic Weed Lantana camara L. Biomass for Adsorptive Removal of Lead

    Directory of Open Access Journals (Sweden)

    Vipin Kumar Saini

    2017-01-01

    Full Text Available Valorization of Lantana camara L., which is a recognized invasive plant, as a potential source of activated carbon is proposed in this study. Its stem and leaf have been utilized for the preparation of activated carbon (ACL and ACS by following acid-impregnation technique, followed by thermal treatment. The developed activated carbon samples were characterized for their structural and surface related properties by low-temperature nitrogen adsorption isotherm, SEM techniques, and pHPZC method. The samples show reasonable high surface area and pore volume; nonetheless, these properties are higher in case of ACL as compraed to ACS. Both of these samples developed negative charge on their surface due to acid treatment that resulted in an increase in adsorption at pH > 5. The batch adsorption studies on these samples shows the Pb(II ion adsorption capacities of ACL and ACS were 36.01 and 32.24 mg·g−1, respectively, at 25°C. The kinetics of adsorption with both the sample systems follow the pseudo-second-order model, whereas the experimental equilibrium isotherm data of ACL and ACS were explained by Freundlich and Langmuir models, respectively. For these samples, the HCl shows maximum desorption with which the recycling test on these samples shows that ACS has better recycling potential over ACL samples.

  19. Genetic diversity and population structure of Lantana camara in India indicates multiple introductions and gene flow.

    Science.gov (United States)

    Ray, A; Quader, S

    2014-05-01

    Lantana camara is a highly invasive plant, which has spread over 60 countries and island groups of Asia, Africa and Australia. In India, it was introduced in the early nineteenth century, since when it has expanded and gradually established itself in almost every available ecosystem. We investigated the genetic diversity and population structure of this plant in India in order to understand its introduction, subsequent range expansion and gene flow. A total of 179 individuals were sequenced at three chloroplast loci and 218 individuals were genotyped for six nuclear microsatellites. Both chloroplasts (nine haplotypes) and microsatellites (83 alleles) showed high genetic diversity. Besides, each type of marker confirmed the presence of private polymorphism. We uncovered low to medium population structure in both markers, and found a faint signal of isolation by distance with microsatellites. Bayesian clustering analyses revealed multiple divergent genetic clusters. Taken together, these findings (i.e. high genetic diversity with private alleles and multiple genetic clusters) suggest that Lantana was introduced multiple times and gradually underwent spatial expansion with recurrent gene flow. © 2013 German Botanical Society and The Royal Botanical Society of the Netherlands.

  20. 2009 - Global Energy Balance - Intendente Camara - Ipatinga - Minas Gerais - Brazil - plant - Superintendence of Energy and Utilities; Balanco energetico global - 2009 - Usina Intendente Camara - Ipatinga - Minas Gerais - Superintendencia de Energia e Utilidades

    Energy Technology Data Exchange (ETDEWEB)

    Silveira Junior, Jose Ronaldo; Bastos, Moises Hofer [Usinas Siderurgicas de Minas Gerais S/A (USIMINAS), Ipatinga, MG (Brazil)

    2010-07-01

    The Global Energy Balance of the USIMINAS - Usina Intendente Camara em Ipatinga - Minas Gerais - Brazil, in 2009, is presented with the the main energy consumption indicators of the producer areas. It is highlighted during 2009 as followed: the steel demand retraction decurring from the world wild financial crisis, given as consequence the stop of the blast furnace 1 and 2; dinishing of the production of sinter, pig iron, steel, hot and cold rolled rilled mill; gradual elevation of the production rhythm at the at the plant and energy consumption during the year, motivated by the slow and gradual recovering of the steel marketing.

  1. Endodoncia regenerativa: utilización de fibrina rica en plaquetas autóloga en dientes permanentes vitales con patología pulpar. Revisión narrativa de la literatura*

    Directory of Open Access Journals (Sweden)

    Tatiana Ramírez Giraldo

    2014-01-01

    Full Text Available Actualmente una de las mayores controversias en el tratamiento de dientes permanentes con diagnóstico de pulpitis está en la decisión de realizar una Terapia Pulpar Vital (TPV o un tratamiento convencional de conductos. Diferentes estudios han reportado que se pueden obtener resultados previsibles mediante la realización de una TPV. El éxito del tratamiento dependerá de una adecuada comprensión de la  biología pulpar, un estricto protocolo de tratamiento y una adecuada selección del caso. Con este fin, diferentes materiales han sido sugeridos. Recientemente se ha utilizado la Fibrina Rica en Plaquetas, biomaterial que cumple con propiedades biológicas para lograr una mayor rapidez y adecuada cicatrizacion del tejido. Es necesario desarrollar tratamientos dirigidos a preservar la vitalidad de la pulpa, evitando recurrir como primera opción al tratamiento convencional de conductos, teniendo como objetivo conservar o regenerar el complejo dentino pulpar.

  2. Endodoncia regenerativa: utilización de fibrina rica en plaquetas autóloga en dientes permanentes vitales con patología pulpar. Revisión narrativa de la literatura*

    Directory of Open Access Journals (Sweden)

    Tatiana Ramírez Giraldo

    2014-07-01

    Full Text Available Actualmente una de las mayores controversias en el tratamiento de dientes permanentes con diagnóstico de pulpitis está en la decisión de realizar una Terapia Pulpar Vital (TPV o un tratamiento convencional de conductos. Diferentes estudios han reportado que se pueden obtener resultados previsibles mediante la realización de una TPV. El éxito del tratamiento dependerá de una adecuada comprensión de la  biología pulpar, un estricto protocolo de tratamiento y una adecuada selección del caso. Con este fin, diferentes materiales han sido sugeridos. Recientemente se ha utilizado la Fibrina Rica en Plaquetas, biomaterial que cumple con propiedades biológicas para lograr una mayor rapidez y adecuada cicatrizacion del tejido. Es necesario desarrollar tratamientos dirigidos a preservar la vitalidad de la pulpa, evitando recurrir como primera opción al tratamiento convencional de conductos, teniendo como objetivo conservar o regenerar el complejo dentino pulpar.

  3. Characterization of leaves and flowers volatile constituents of Lantana camara growing in central region of Saudi Ar

    Directory of Open Access Journals (Sweden)

    Merajuddin Khan

    2016-11-01

    Full Text Available The chemical components of essential oils derived from leaves and flowers of Lantana camara growing in Saudi Arabia are analyzed for the first time using gas chromatography techniques (GC–MS, GC–FID, Co-GC, LRI determination, and database and literature searches on two different stationary phase columns (polar and nonpolar. This analysis led to the identification of total 163 compounds from leaves and flowers oils. 134 compounds were identified in the oil obtained from leaves of L. camara, whereas 127 compounds were identified in the oil obtained from flowers; these compounds account for 96.3% and 95.3% of the oil composition, respectively. The major components in the oil from leaves were cis-3-hexen-1-ol (11.3%, 1-octen-3-ol (8.7%, spathulenol (8.6%, caryophyllene oxide (7.5% and 1-hexanol (5.8%. In contrast, the major compounds in the flowers oil were caryophyllene oxide (10.6%, β-caryophyllene (9.7%, spathulenol (8.6%, γ-cadinene (5.6% and trans-β-farnesene (5.0%. To the best of our knowledge, cis-3-hexen-1-ol and 1-octen-3-ol that were identified as major components in this study have not been reported earlier from Lantana oils.

  4. Lantana camara invasion in urban forests of an Indo–Burma hotspot region and its ecosustainable management implication through biomonitoring of particulate matter

    Directory of Open Access Journals (Sweden)

    Prabhat Kumar Rai

    2015-12-01

    Full Text Available The present study was performed in urban forests of Aizawl, Mizoram, north east India falling under an Indo–Burma hot spot region of existing ecological relevance and pristine environment. The phytosociolology of invasive weeds has been studied, showing that Lantana camara was the most dominant invasive weed. Further, the air quality studies revealed high suspended particulate matter as well as respirable suspended particulate matter in the ambient air of Aizawl. Biomonitoring through plant leaves has been recognized as a recent thrust area in the field of particulate matter science. We aimed to investigate whether L. camara leaves may act as a biomonitoring tool hence allowing its sustainable management. The quantity of respirable suspended particulate matter and suspended particulate matter at four different sites were much higher than the prescribed limits of Central Pollution Control Board of India during the summer and winter seasons. The dust deposition of L. camara leaves was 1.01 mg/cm2 and, pertaining to the biochemical parameters: pH was 7.49; relative water content 73.74%; total chlorophyll 1.91 mg/g; ascorbic acid 7.06 mg/g; sugar 0.16 mg/g; protein 0.67 mg/g; catalase 30.76 U/mg protein; peroxidase 0.16 U/mg protein; and air pollution tolerance index was 12.91. L. camara was observed in the good category in anticipated performance index, which shows the tolerant and conditioning capacity of air pollution. Therefore, the present study recommends the use of L. camara as biomonitor that may further have sustainable management implications for an invasive plant.

  5. Alternativas de medicação intracanal em casos de necrose pulpar com lesão periapical = Intracanal medication indicated for pulpal necrosis with apical osteites

    Directory of Open Access Journals (Sweden)

    Fachin, Elaine Vianna Freitas

    2006-01-01

    Full Text Available Trata-se de estudo in vivo em pacientes portadores de dentes monorradiculares apresentando necrose pulpar com lesão periapical. O objetivo foi avaliar radiograficamente a efetividade de 4 diferentes curativos de demora (PMCC, gel de clorexidina 2%, pasta de hidróxido de cálcio e hipoclorito de sódio1%. O tratamento endodôntico foi padronizado em todos os elementos através da técnica escalonada e irrigação com hipoclorito de sódio 1%. Para a medicação intracanal, os pacientes foram separados aleatoriamente em 4 grupos que receberam um dos medicamentos listados. Após 7 dias, os canais foram obturados e submetidos a controle radiográfico aos 3, 6 e 9 meses em que se mediu com precisão a diminuição do diâmetro radiolúcido apical. Os resultados mais satisfatórios ocorreram após o uso do PMCC, seguido pelo hidróxido de cálcio, clorexidina 2% e, por último, hipoclorito de sódio 1%

  6. Microscopic analysis of dog dental pulp after pulpotomy and pulp protection with mineral trioxide aggregate and white Portland cement Análise microscópica da polpa dental de cães após pulpotomia e proteção pulpar com agregado de trióxido mineral e cimento Portland branco

    Directory of Open Access Journals (Sweden)

    Renato Menezes

    2004-06-01

    Full Text Available Considering previous studies on the similarity between the chemical composition of the mineral trioxide aggregate and the Portland cement, the purpose of this study was to investigate the pulp response of dog's teeth after pulpotomy and direct pulp protection with MTA Angelus and white Portland cement. Thirty eight pulp remnants were protected with these materials. One hundred and twenty days after treatment, the animals were sacrificed and the specimens removed and prepared for histological analysis. Both materials demonstrated the same results when used as pulp capping materials, inducing hard tissue bridge formation and maintaining pulp vitality in all specimens. The MTA Angelus and the white Portland cement showed to be effective as pulp protection materials following pulpotomy.Considerando estudos anteriores sobre a similaridade entre a composição química do agregado de trióxido mineral e o cimento Portland, o objetivo deste estudo foi investigar a resposta pulpar de dentes de cães após pulpotomia e proteção pulpar direta com MTA Angelus e cimento Portland branco. Trinta e oito remanescentes pulpares foram recobertos com esses materiais. Cento e vinte dias após o tratamento, os animais foram sacrificados e os espécimes removidos e preparados para análise histológica. Ambos os materiais demonstraram os mesmos resultados quando utilizados como materiais de capeamento pulpar, induzindo a formação de ponte de tecido mineralizado e mantendo a vitalidade pulpar em todos os espécimes. Ambos matérias se mostraram efetivos como protetores pulpares após pulpotomia em dentes de cães.

  7. Lantana camara Linn leaf extract mediated green synthesis of gold nanoparticles and study of its catalytic activity

    Science.gov (United States)

    Dash, Shib Shankar; Bag, Braja Gopal; Hota, Poulami

    2015-03-01

    A facile one-step green synthesis of stable gold nanoparticles (AuNPs) has been described using chloroauric acid (HAuCl4) and the leaf extract of Lantana camara Linn (Verbenaceae family) at room temperature. The leaf extract enriched in various types of plant secondary metabolites is highly efficient for the reduction of chloroaurate ions into metallic gold and stabilizes the synthesized AuNPs without any additional stabilizing or capping agents. Detailed characterizations of the synthesized gold nanoparticles were carried out by surface plasmon resonance spectroscopy, transmission electron microscopy, dynamic light scattering, Zeta potential, X-ray diffraction and Fourier transform-infrared spectroscopy studies. The synthesized AuNPs have been utilized as a catalyst for the sodium borohydride reduction of 4-nitrophenol to 4-aminophenol in water at room temperature under mild reaction condition. The kinetics of the reduction reaction has been studied spectrophotometrically.

  8. Antioxidant, antibacterial and cytotoxic potential of silver nanoparticles synthesized using terpenes rich extract of Lantana camara L. leaves

    Directory of Open Access Journals (Sweden)

    Patil Shriniwas P.

    2017-07-01

    Full Text Available Several attempts have been made for green synthesis of silver nanoparticles (AgNPs using different plant extracts. Present study revealed that, antioxidant, antibacterial and cytotoxic AgNPs were synthesized using terpenes-rich extract (TRE of environmentally notorious Lantana camara L. leaves. AgNPs were characterized by advanced techniques like UV–Visible and Infra red spectroscopy; XRD, SEM techniques as terpenes coated sphere shaped NPs with average diameter 425 nm. Further, on evaluation, AgNPs were found to exhibit dose – dependent antioxidant potential, good to moderate antibacterial activity against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa; and toxicity on Brine shrimp (A. salinanauplii with LD50 value 514.50 µg/ml.

  9. Revascularización pulpar en dientes permanentes jóvenes con ápice abierto y pulpa necrótica: revisión bibliográfica

    OpenAIRE

    Molina Adame, Nuria

    2016-01-01

    INTRODUCCIÓN: La revascularización pulpar es un tratamiento regenerativo para tratar dientes inmaduros con pulpa necrótica por caries o traumatismos que, a diferencia de la apexificación y el uso de barreras apicales artificiales, permite la continuación del desarrollo radicular. Esta revisión tiene por objeto exponer el procedimiento y principios básicos de la revascularización así como ver las posibles ventajas e inconvenientes que presenta. MATERIAL Y MÉTODO: se realiza l...

  10. Ventajas del mineral trióxido agregado y del hidróxido de calcio frente a patologías pulpares de tipo degenerativo

    Directory of Open Access Journals (Sweden)

    Edison Gabriel Quintero Ricardo

    2014-06-01

    Full Text Available ResumenEl agregado de trióxido mineral (MTA es un material desarrollado para endodoncia. Las principales indicaciones del MTA, son el tratamiento pulpar en dientes vitales (pulpotomias, recubrimiento pulpar directo, apicoformaciones (barrera apical, cirugía endodóncica, reparación de perforaciones furcales, laterales y las provocadas por las reabsorciones. El MTA favorece la formación de hueso y cemento, y puede facilitar la regeneración del ligamento periodontal sin provocar inflamación; como un coadyuvante del MTA en los procesos de reparación tenemos el hidróxido de calcio que es un potente agente bacteriostático y bactericida que se utiliza para el control de microorganismos cuando es empleado como medicamento intraconducto, igualmente actúa como agente catalizador en la modificación del pH en los tejidos periapicales con el fin de favorecer el proceso de cicatrización, presenta excelentes propiedades higroscópica en cuanto al control del exudado en conductos radiculares de dientes con lesiones periapicales grandes los cuales muchas veces presentan humedad persistente en los canales radiculares asimismo actúa en la prevención o detención de procesos resortivos ejerciendo efectos moduladores en la actividad clástica. Por tales propiedades el artículo tiene como fin mostrar los efectos a corto plazo que ocurren en una reabsorción interna y lesión apical al momento de utilizar mineral trióxido agregado (MTA e hidróxido de calcio como material intracanal. (Duazary 2009-II 141-146AbstractMineral trioxide aggregate (MTA is a new material developed for endodontics. The principal indications of MTA are vital pulp therapy (pulpotomy, direct pulp capping, apexification (apical plug, endodontic surgery, and lateral, furcal and resorption perforations repair. The MTA induce the formation of cementum and bone, and it may facilitate the regeneration of the periodontal ligament without causing any inflammation; as a helping of the

  11. [Microscopic anatomy and volatile secondary metabolites at three stages of development of the inflorescences of Lantana camara (Verbenaceae)].

    Science.gov (United States)

    Caroprese Araque, José Fernando; Parra Garcés, María Isabel; Arrieta Prieto, Dagoberto; Stashenko, Elena

    2011-03-01

    Plants of the Verbenaceae family, like L. camara, have called the attention of researchers, not only because of its high diversity and its distribution around the world, but also for its variable use as popular medicine to treat diseases like tetanus, rheumatism and malaria, and as bactericide and insecticide. To assess this, the morphology and ontogeny of the inflorescences of Lantana camara and the chemical composition of volatile secondary metabolites were analyzed at three different ontogeny stages. Plants were collected from the experimental crop area in CENIVAM, Bucaramanga, Colombia. Fresh inflorescence stages were established and analyzed using a stereoscopic microscope, fixed in FAA and included in parafine. Transversal and longitudinal 10 microm thick sections were prepared using a rotative microtome, safranine-fastgreen stained and were observed and photographed using a light microscope. The chemical composition of volatile secondary metabolites were analyzed for each stage. The analytes, obtained from 0.7 g of plant, were isolated by solid phase micro-extraction in the headspace mode (HS-SPME) and were placed in 20 ml vials. The components were analyzed by gas chromatography coupled to mass spectrometry (GC-MS). Stage I was microscopically characterized by an immature development in which the meristematic differentiation begins with a mass of cells. In Stage II, the morphogenetic movement gives way to the formation of the respective floral sexual structures, calyx and corolla. In Stage III, the different organs are conspicuous: four stamens epipetals and didynamous, monocarpelar, biloculate and globose gynoecium, upper ovary and lateral stigma; the flowers are hermaphroditic. The main secondary metabolites detected by GC-MS were bicyclosesquiphellandrene, E-beta-farnesene, E-beta-caryophyllene, gamma-muurolene + gamma-curcumene and alpha-zingiberene. Nevertheless, this study reports for the first time in plant species alpha-gurjunene, gamma

  12. Evaluation of temperature variation in pulp chamber after high power diode laser irradiation ({lambda}=830 nm) on dental enamel: 'in vitro' study; Avaliacao da variacao da temperatura na camara pulpar apos a irradiacao de diodo laser de alta potencia de 830 nanometros em esmalte dental: estudo 'in vitro'

    Energy Technology Data Exchange (ETDEWEB)

    Macri, Rodrigo Teixeira

    2001-07-01

    The aim of this study was to observe the variation of temperature in the pulp chamber caused by irradiation of a commercial diode laser operating in continuous wave with wavelength 830 nm over the dental enamel. In the first part of this study, two types of tooth models were tested: 3,5 mm slice and whole tooth. In the second part, we irradiated the buccal si de of the enamel in 2 primary lower incisors from cattle with Opus 10 diode laser for 10 s with power levels of 1 W and 2 W, always using an absorber. Two thermocouples were used. The first one was inserted in the dentin wall closest to the irradiation site, while the second was inserted in the middle of the pulp chamber. It was observed that the thermocouples registered different temperatures. Always, the dentin thermocouple registered higher temperatures. Considering the dentin records, the irradiation of 1 W for 10 s can be safe for the pulp. Further studies must be developed related to the correct positioning of the thermocouples inside the pulp chamber. This was a first step of using diode laser in enamel, and in this study, we concluded that the Opus 10 diode laser shown to be safe for this use, with 1 W power for 10 S. (author)

  13. Microaspersores entupidos devido a problemas de ferro na água Microsprinkler clogged due to iron problems in the water

    Directory of Open Access Journals (Sweden)

    Túlio Assunção Pires Ribeiro

    2008-08-01

    Full Text Available Um dos aspectos relevantes a ser considerado no manejo da irrigação é a uniformidade de distribuição de água pelo sistema. Este trabalho foi desenvolvido com o objetivo de avaliar a eficiência da cloração com a utilização de hipoclorito de sódio na desobstrução de microaspersores devido à utilização de águas com elevado teor de ferro. Um sistema com dez meses de uso apresentava setores com vazões de 5% a 57% menores que a vazão de projeto. Foi feito o tratamento químico da água de irrigação, utilizando-se hipoclorito de sódio com 12% de cloro livre na dosagem de 100 mg L-1 e ácido sulfúrico, na concentração de 98%, para manter o pH da água de irrigação em torno de 4,5. O resultado indicou que houve aumento significativo nas vazões médias dos microaspersores em todos os setores avaliados e diminuição na variação da vazão dos mesmos com relação à estimada no projeto.An important aspect to be considered in irrigation managment is the uniformity distribution of water through the irrigation system. This research had the objective to evaluate the efficiency of chlorination in the use of sodium hypochlorite in clearing of microsprinkler due to the presence of high iron concentration in water. The equipment with less than a year of use presenting sectors with 5% and 57% lower flow than the original project flow. The chemical treatment of water irrigation utilized sodium hypochlorite with 12% free chlorine on 100mg L-1 concentration, and sulphuric acid 98% to maintain the pH of water irrigation about 4.5. The result demonstrated a significant increase in the average flow of the microsprinkler's variation in all evaluted setors, and decrease in their flow variation related to the estimated in the project.

  14. Importancia de la semiología del dolor en el diagnóstico de un proceso inflamatorio pulpar Significance of pain's Symptomatology in the diagnosis of pulpal inflammatory process

    Directory of Open Access Journals (Sweden)

    Andrés 0 Pérez Ruiz

    2011-09-01

    Full Text Available El dolor es un síntoma de extraordinaria importancia en la práctica estomatológica y particularmente en lo concerniente a las alteraciones de la pulpa dentaria. Con el objetivo de profundizar en el conocimiento de las fases por las que atraviesa un proceso inflamatorio pulpar, que permiten predecir sus manifestaciones dolorosas, se realizó una revisión bibliográfica sobre el tema con un enfoque multidisciplinario y básico-clínico. Se utilizó el método documental para el análisis y tratamiento de la información ofrecida por las fuentes teóricas. El sitio en Internet Google fue empleado como fundamental motor de búsqueda y Lilacs, Hinari, Medline y PubMed fueron las bases de datos más revisadas. La clasificación del estado de inflamación pulpar, que atiende a eventos histopatológicos que no se pueden visualizar, resulta más difícil. Se podría lograr mayor precisión en un diagnóstico basado en el curso que sigue el dolor, de acuerdo a la magnitud del compromiso inflamatorio y apoyado en la rica semiología que se puede obtener si se sigue la trayectoria de las variables del estímulo nociceptivo. El incremento y profundización de los conocimientos en este campo contribuiyó significativamente a un mejor diagnóstico y tratamiento de los procesos inflamatorios pulpares.Pain is a symptom very important in the stomatologic practice and particularly in that concerning to dental pulp alterations. To deep in the knowledge of phases crossed by a pulpal inflammatory process allowing predicting its painful manifestations, authors made a bibliographic review on this subject with a multidisciplinary and basic-clinical approach, using the documentary method for analysis and management of information offered by theoretical sources. Google was used as a fundamental search tool and LILACS, HINARI, Medline and PubMed were the more reviewed databases. The classification of pulpal inflammation state, taking into account non

  15. NOVAS PERSPECTIVAS DA RESPONSABILIDADE PROCESSUAL NO BRASIL: O PRINCÍPIO DA BOA-FÉ OBJETIVA E O DEVIDO PROCESSO LEGAL

    Directory of Open Access Journals (Sweden)

    Thiago Rodrigues de Pontes Bomfim

    2016-09-01

    Full Text Available O presente estudo busca, inicialmente, demonstrar o caráter normativo dos princípios constitucionais, bem como seu papel no que acaba por se transformar em uma nova ordem processual, para, por fim, uma vez reconhecido o caráter de princípio jurídico à boa-fé objetiva, situar seu fundamento constitucional em um novo conceito de devido processo legal.

  16. Are there evidences of a complex mimicry system among Asclepias curassavica (Apocynaceae), Epidendrum fulgens (Orchidaceae), and Lantana camara (Verbenaceae) in Southern Brazil?

    OpenAIRE

    Fuhro, Daniela; Araújo, Aldo Mellender de; Irgang, Bruno Edgar

    2010-01-01

    The goal of this paper was to test the presence of mimicry in Asclepias curassavica L., Epidendrum fulgens Brong., and Lantana camara L. The study was carried out at the Parque Estadual de Itapeva, RS, southern Brazil, from 2004 to 2006. Flowering period of each of the three species was followed up; focal observations of butterflies visiting flowers, from fixed point and during random walks were carried out. We also estimated the frequency of pollinaria removal in the orchid, as well as its m...

  17. Vermicomposting eliminates the toxicity of Lantana (Lantana camara) and turns it into a plant friendly organic fertilizer

    Energy Technology Data Exchange (ETDEWEB)

    Hussain, N.; Abbasi, Tasneem; Abbasi, S.A., E-mail: prof.s.a.abbasi@gmail.com

    2015-11-15

    Highlights: • It is shown for the first time that Lantana can lose its toxicity when vermicomposted. • The Lantana vermicompost is shown to be a good organic fertilizer. • FTIR studies identified Lantana’s toxic constituents destroyed by vermicomposting. • The findings have far-reaching implications in the gainful use of harmful weeds. - Abstract: In evidently the first study of its kind, vermicompost derived solely from a weed known to possess plant and animal toxicity was used to assess its impact on the germination and early growth of several plant species. No pre-composting or supplementation of animal manure was done to generate the vermicompost in order to ensure that the impact is clearly attributable to the weed. Whereas the weed used in this study, Lantana (Lantana camara), is known to possess strong negative allelopathy, besides plant/animal toxicity in other forms, its vermicompost was seen to be a good organic fertilizer as it increased germination success and encouraged growth of all the three botanical species explored by the authors – green gram (Vigna radiata), ladies finger (Abelmoschus esculentus) and cucumber (Cucumis sativus). In terms of several physical, chemical and biochemical attributes that were studied, the vermicompost appeared plant-friendly, giving best results in general when employed at concentrations of 1.5% in soil (w/w). Fourier transform infrared spectrometry revealed that the phenols and the sesquiterpene lactones that are responsible for the allelopathic impact of Lantana were largely destroyed in the course of vermicomposting. There is also an indication that lignin content of Lantana was reduced during its vermicomposting. The findings open up the possibility that the billions of tons of phytomass that is generated annually by Lantana and other invasives can be gainfully utilized in generating organic fertilizer via vermicomposting.

  18. Vermicomposting eliminates the toxicity of Lantana (Lantana camara) and turns it into a plant friendly organic fertilizer

    International Nuclear Information System (INIS)

    Hussain, N.; Abbasi, Tasneem; Abbasi, S.A.

    2015-01-01

    Highlights: • It is shown for the first time that Lantana can lose its toxicity when vermicomposted. • The Lantana vermicompost is shown to be a good organic fertilizer. • FTIR studies identified Lantana’s toxic constituents destroyed by vermicomposting. • The findings have far-reaching implications in the gainful use of harmful weeds. - Abstract: In evidently the first study of its kind, vermicompost derived solely from a weed known to possess plant and animal toxicity was used to assess its impact on the germination and early growth of several plant species. No pre-composting or supplementation of animal manure was done to generate the vermicompost in order to ensure that the impact is clearly attributable to the weed. Whereas the weed used in this study, Lantana (Lantana camara), is known to possess strong negative allelopathy, besides plant/animal toxicity in other forms, its vermicompost was seen to be a good organic fertilizer as it increased germination success and encouraged growth of all the three botanical species explored by the authors – green gram (Vigna radiata), ladies finger (Abelmoschus esculentus) and cucumber (Cucumis sativus). In terms of several physical, chemical and biochemical attributes that were studied, the vermicompost appeared plant-friendly, giving best results in general when employed at concentrations of 1.5% in soil (w/w). Fourier transform infrared spectrometry revealed that the phenols and the sesquiterpene lactones that are responsible for the allelopathic impact of Lantana were largely destroyed in the course of vermicomposting. There is also an indication that lignin content of Lantana was reduced during its vermicomposting. The findings open up the possibility that the billions of tons of phytomass that is generated annually by Lantana and other invasives can be gainfully utilized in generating organic fertilizer via vermicomposting

  19. Experimental and theoretical investigations of Lantana camara oil diffusion from polyacrylonitrile membrane for pulsatile drug delivery system

    Energy Technology Data Exchange (ETDEWEB)

    Verma, Vivek [Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune 411008 (India); Balasubramanian, K., E-mail: meetkbs@gmail.com [Department of Materials Engineering, Defence Institute of Advance Technology (DIAT), Ministry of Defence, Girinagar, Pune 411025 (India)

    2014-08-01

    Porous composite membrane of polyacrylonitrile (PAN) and Lantana camara essential oil was synthesized by solvent casting method. Stability of oil in PAN solution was measured by XiGo nano tool indicating constant relaxation time of 1487 time/s. Pore size of few microns confirmed by electron microscopy was supported by atomic force microscopy indicating roughness factor of 0.9 nm. Contact angle of 2° inveterates superhydrophilicity of the composite membrane. Membrane showed excellent antibacterial activity against both Gram-positive Bacillus subtilis and Gram-negative Escherichia coli with a 7–10 mm zone of inhibition. In vitro release of Lantana oil from the composite membrane was carried out in isotonic phosphate buffer solution (pH = 7.4). Lantana oil was released for 9 h, lag time of 3 h with constant 33% release confirmed PAN membranes as potential system for pulsatile drug delivery applications. Diffusion of E-caryophyllene (antibacterial component of oil) which was studied through molecular simulation using Material Studio software ensued diffusion coefficient value of 1.11 ∗ 10{sup −9} m{sup 2}/s. Biocompatibility of the composite membrane was assessed by mouse embryonic fibroblast cell line (NIH 3T3) through MTT assay indicating more than 91% viable cell even at 200 μg/mL concentration. Such membranes can be efficiently used in biomedical applications as antibacterial and antifungal agent. - Highlights: • Pulsatile release • Lantana oil–PAN composite membrane as antibacterial material • Enhanced bactericidal activity of the membrane.

  20. Effect of time and temperature of storage on the activity of the etanolic extracts of Lantana camara L. and Heliotropium indicum L. on Colletotrichum gloeosporioides

    Directory of Open Access Journals (Sweden)

    Rafael Alejandro Infante

    2015-10-01

    Full Text Available The effect of time and temperature of storage of ethanolic extracts (EE of Lantana camara and Heliotropium indicum on Colletotrichum gloeosporioides was investigated. The EE were stored at 8±2 and 26±2°C, during one year. Every 2 months they were diluted in potato dextrose agar (PDA at 0; 0.5; 1 y 1.5% (v/v concentrations, fungus disks were placed onto the media, mycelial growth (ICM and sporulation (IE inhibition were measured, as well as conidia germination. The EE stored at 8±2°C maintained their effectiveness on all variables during the 12 months storage, while those stored at 26±2°C started to lose their effectiveness at 6 to 8 months, ending up to 3% ICM, 4% IE and 18% conidia germination at 1.5% concentration. Results indicated that storage temperature and time are determinant for extracts effectiveness.

  1. O INSTITUTO DO INQUÉRITO CIVIL VISTO COMO FORMA E MEIO IMPORTANTE PARA PACIFICAR AS DEMANDAS COLETIVAS E A DISCUSSÃO DE SEU DEVIDO PROCESSO CONSTITUCIONAL

    Directory of Open Access Journals (Sweden)

    Francisco das Chagas da Silva

    2017-06-01

    Full Text Available O objetivo deste trabalho é abordar as peculiaridades do inquérito civil no direito brasileiro sob a ótica dos princípios que embasam o devido processo legal. Introduzido pela lei da Ação Civil Pública, o Inquérito Civil é um instituto de titularidade do Ministério Público voltado a auxiliar a pacificação dos conflitos coletivos, servindo de fundamento para a propositura de ações coletivas e de firmação do termo de ajustamento de conduta (TAC, mecanismos processuais e extraprocessuais que tem como finalidade a defesa de interesses difusos, coletivos e individuais homogêneos. Durante todo o desenvolvimento desta pesquisa foram analisadas diversas obras literárias dos mais variados autores da área do direito processual civil, do direito processual do trabalho e do direito constitucional, além da apreciação de dados oriundos da jurisprudência pátria, bem como revistas e periódicos da área jurídica pertinentes ao tema aqui desenvolvido. O trabalho está dividido numa apreciação sobre o devido processo constitucional e nos princípios norteadores do processo. Depois será desenvolvida uma análise acerca da natureza jurídica do inquérito civil e, por fim, uma discussão acerca do contraditório nesse procedimento administrativo, verificando as argumentações doutrinárias que negam a aplicação deste princípio.

  2. Creams formulated with Ocimum gratissimum L. and Lantana camara L. crude extracts and fractions as mosquito repellents against Aedes aegypti L. (Diptera: Culicidae).

    Science.gov (United States)

    Keziah, Ezeike Amarachi; Nukenine, Elias Nchiwan; Danga, Simon Pierre Yinyang; Younoussa, Lame; Esimone, Charles Okechukwu

    2015-01-01

    Mosquitoes are the most deadly vectors of parasites that cause diseases such as malaria, yellow fever, and filariasis. In view of the recent increased interest in developing plant origin insecticides as an alternative to chemical insecticides, the objective of this study was to determine the repellent activity of creams formulated with methanol crude extract (MCE), hexane fraction (HF), and ethyl acetate fractions (EAFs) of Ocimum gratissimum and Lantana camara leaves in single and combined actions against female Aedes aegypti. Evaluation was carried out in the net cages (30 by 30 by 30 cm) containing 60 blood-starved female mosquitoes each and were assayed in the laboratory condition following World Health Organization 2009 protocol. All formulations (single and mixture) were applied at 2, 4, 6, and 8 mg/cm(2) in the exposed area of human hands. Only acetone + white soft paraffin served as negative control and odomos (12% DEET) as positive control. All the formulations presented good protection against mosquito bites without any allergic reaction by the human volunteers. The repellent activity was dependent on the strength of the extracts and fractions. Among the tested formulations, the maximum protection time was observed in MCE (120 min) and EAF (150 min) of O. gratissimum; MCE:MCE (150 min) and HF:HF (120 min) mixtures of both plants. In addition, MCE:MCE and HF:HF mixtures from both plants showed possible synergistic effect. From the results, the combination of O. gratissimum and L. camara to formulate natural mosquito repellent using small amount of extracts can be encouraging to be an alternative to conventional DEET. © The Author 2015. Published by Oxford University Press on behalf of the Entomological Society of America.

  3. Evaluación de la actividad antioxidante bioautográfica de cinco variedades de aceites esenciales andinos (Aristeguietia glutinosa; Myrcianthes rhopaloides; Ambrosia arborescens; Lantana camara; Minthostachys mollis)

    OpenAIRE

    Guerrero Toapanta, Priscila Pamela; Pozo Morales, Karla Natalia

    2016-01-01

    This experimental work had the goal of assessing the antioxidant capabilities of five essential oils: Minthostachys mollis, Aristeguietia glutinosa, Ambrosia arborescens, Myrcianthes rhopaloides and Lantana camara; all of which were obtained from the Ecuadorian Andes. This work used the DPPH and ABTS methods to assess free radical-capturing capacity, and it used the β-carotene Test to determine the antioxidant activity of each essential oil. The natural referent used herein...

  4. EFECTOS TOXICOLÓGICOS DE EXTRACTOS DE MOLLE (Schinus molle) Y LANTANA (Lantana camara) SOBRE Chrysoperla externa (NEUROPTERA: CHRYSOPIDAE), Trichogramma pintoi (HYMENOPTERA: TRICHOGRAMMATIDAE) Y Copidosoma koehleri (HYMENOPTERA: ENCYRTIDAE) EN EL PERÚ

    OpenAIRE

    Iannacone O., José; Lamas M., Gerardo

    2003-01-01

    Extractos de dos plantas; el molle (Schinus molle L., Anacardiaceae) y la lantana (Lantana camara L., Verbenaceae), se evaluaron sobre huevos, larvas de primer estadio y pupas de Chrysoperla externa Hagen (Neuroptera: Chrysopidae), y sobre estados inmaduros y adultos de los microhimenopteros Trichogramma pintoi Voegelé (Trichogrammatidae) y Copidosoma koehleri Blanchard (Encyrtidae), en bioensayos toxicológicos bajo condiciones de laboratorio. Los extractos acuosos (F1) del molle y la lantana...

  5. Avaliação em MEV da fenda resultante da contração de polimerização da resina composta aplicada sobre diferentes materiais protetores pulpares = A sem evaluation of the gap resulting from the polymerization shrinkage of composite resins applied to different pulp protective materials

    Directory of Open Access Journals (Sweden)

    Unfer, Daniele Taís

    2006-01-01

    Full Text Available Introdução: A resina composta sofre contração como resultado da reação de polimerização que pode deslocar os materiais protetores pulpares, caso estes apresentem deficiente ou nenhuma adesão a dentina. Objetivo: avaliar o comportamento de dois materiais de proteção pulpar (CIV e CaOH2 cement em relação presença de fenda, quando submetidos a estresse de contração da resina composta e avaliar a fenda resultante da contração de polimerização entre dentina e resina composta. Metodologia: Foram confeccionados preparos classe V nas faces vestibular e lingual de 12 dentes molares humanos os quais foram divididos em quatro grupos de estudo, conforme a técnica restauradora e os materiais utilizados: G1 (SA + RC; G2 (HC + SA + RC; G3 (CIV + SA + RC e G4 (HC + CIV + SA + RC. Os corpos de prova foram avaliados em MEV e os dados obtidos foram submetidos análise não-paramétrica. Resultados: Os resultados obtidos mostram que os materiais de proteção pulpar utilizados são deslocados pela contração gerada pela polimerização da resina composta. Os melhores resultados (não presença de fenda foram demonstrados no grupo em que o sistema adesivo foi o único material entre a dentina e a resina composta. Quando do uso do CIV e do HC, associados ou não, foi encontrado o maior percentual de fendas. Conclusão: Os materiais de proteção pulpar continuarão a ser deslocados pela contração de polimerização das resinas compostas enquanto sua união à estrutura dental não apresentar suficiente resistência ou não se evitar a contração da resina composta

  6. Effect of vermicast generated from an allelopathic weed lantana (Lantana camara) on seed germination, plant growth, and yield of cluster bean (Cyamopsis tetragonoloba).

    Science.gov (United States)

    Karthikeyan, M; Hussain, N; Gajalakshmi, S; Abbasi, S A

    2014-11-01

    In perhaps the first-ever study of its kind, the effect of vermicompost, derived solely from an allelopathic weed, on the germination, growth, and yield of a botanical species, has been carried out. In test plots, the soil was treated with the vermicompost of lantana (Lantana camara) at the rates of 5, 7.5, and 10 t ha(-1), and cluster bean (Cyamopsis tetragonoloba) was grown on it. The performance of these systems was compared with the systems in which the soil was fortified with inorganic fertilizers (IFs) in concentrations equivalent to those present in the respective vermicompost (VC) treatments. Additionally, a set of control was studied in which the soil was used without fortification by either VC or IF. It was seen that up to 51.5 % greater germination success occurred in the VC treatments compared to controls. VC also supported better plant growth in terms of stem diameter, shoot length, shoot mass, number of leaves, and leaf pigments. The positive impact extended up to fruit yield. In addition, vermicast application enhanced root nodule formation, reduced disease incidence, and allowed for a smaller number of stunted plants. The results indicate that allelopathic ingredients of lantana seem to have been totally eliminated during the course of its vermicomposting and that lantana vermicompost has the potential to support germination, growth, and fruit yield better than equivalent quantities of IFs.

  7. Pyrolysis of Lantana camara and Mimosa pigra: Influences of temperature, other process parameters and incondensable gas evolution on char yield and higher heating value.

    Science.gov (United States)

    Mundike, Jhonnah; Collard, François-Xavier; Görgens, Johann F

    2017-11-01

    Pyrolysis of invasive non-indigenous plants, Lantana camara (LC) and Mimosa pigra (MP) was conducted at milligram-scale for optimisation of temperature, heating rate and hold time on char yield and higher heating value (HHV). The impact of scaling-up to gram-scale was also studied, with chromatography used to correlate gas composition with HHV evolution. Statistically significant effects of temperature on char yield and HHV were obtained, while heating rate and hold time effects were insignificant. Milligram-scale maximised HHVs were 30.03MJkg -1 (525°C) and 31.01MJkg -1 (580°C) for LC and MP, respectively. Higher char yields and HHVs for MP were attributed to increased lignin content. Scaling-up promoted secondary char formation thereby increasing HHVs, 30.82MJkg -1 for LC and 31.61MJkg -1 for MP. Incondensable gas analysis showed that temperature increase beyond preferred values caused dehydrogenation that decreased HHV. Similarly, CO evolution profile explained differences in optimal HHV temperatures. Copyright © 2017 Elsevier Ltd. All rights reserved.

  8. Poluentes do ar e internações devido a doenças cardiovasculares em São José do Rio Preto, Brasil

    Directory of Open Access Journals (Sweden)

    Kátia Cristina Cota Mantovani

    2016-02-01

    Full Text Available Resumo O presente estudo teve como objetivo estimar os efeitos de poluentes ambientais sobre o número de internações por doenças cardiovasculares. Foi um estudo ecológico com dados de internações hospitalares de residentes em São José do Rio Preto, São Paulo, Brasil, com diagnóstico nas categorias de I-00 a I-99, entre 01/10/11 e 30/09/12. Os poluentes analisados foram partículas finas (PM2,5, ozônio, monóxido de carbono, óxido de nitrogênio e dióxido de nitrogênio. Foram estimados pelo modelo CCATT-BRAMS. O uso do modelo aditivo de regressão de Poisson foi utilizado para estimar associação entre a exposição ao PM2,5 e internação por doença cardiovascular. Foram calculados os excessos de internação e os gastos por estas doenças. Observou-se que a exposição ao PM2,5 no quinto dia após a exposição (lag 5 foi significativo para internação e aumentou em 15 ppts segundo incremento de 10µg /m3 na concentração de PM2,5. Foram identificadas 650 internações evitáveis com custos da ordem de R$ 1,9 milhão. Desse modo, foi possível identificar associação entre exposição ao PM2,5 e internações devido a doenças cardiovasculares em cidades de médio porte como São José do Rio Preto fornecendo subsídios aos gestores municipal e regional de Saúde.

  9. Internamento devido a PAC por Streptococcus pneumoniae - Avaliação de factores de mortalidade Streptococcus pneumoniae - caused CAP in hospitalised patients: mortality predictors

    Directory of Open Access Journals (Sweden)

    Sandra Figueiredo

    2008-10-01

    Full Text Available A avaliação da gravidade perante qualquer caso de pneumonia adquirida na comunidade (PAC é de suma importância, pois dela decorrem decisões como a necessidade de internamento e o tratamento empírico inicial. Os autores apresentam um estudo retrospectivo, que incluiu doentes internados devido a pneumonia por Streptococcus pneumoniae durante o ano de 2006, no Hospital de São João. A confirmação etiológica de infecção foi feita por isolamentos no sangue, líquido pleural, secreções traqueobrônquicas, lavado brônquico, lavado broncoalveolar e pesquisa de antigenúria. Foram analisados os factores de risco e avaliados, com base nas normas PSI (Pneumonia Severity Index e da British Thoracic Society (BTS - CURB-65. A análise estatística foi efectuada utilizando teste T para amostras independentes e ANOVA, usando o programa de análise estatística SPSS 14.0. Foram incluídos 104 doentes com idade mediana de 63 anos, sendo 67,3% do sexo masculino. O estudo revelou existir uma associação com significado estatístico entre os resultados de PSI e CURB-65 e a evolução para a mortalidade. Apesar da melhoria dos meios diagnósticos e profilácticos, e da terapêutica antibiótica, a pneumonia pneumocócica permanece uma entidade de grande morbilidade e mortalidade. O valor preditivo das normas PSI e CURB-65 foi confirmado nesta população de doentes, documentando uma correlação entre o número de factores de risco e a evolução da doença.Probably the most important decision in the management of Community-Acquired Pneumonia (CAP is patient site of care. Patients with Streptococcus pneumoniae-caused CAP admitted to our hospital between 1st January and 31st December 2006 were retrospectively analysed. Samples of blood, sputum, bronchial and bronchoalveolar lavage and urine were collected for microbiological testing using standard culture techniques and urine antigen detection. Pneumonia Severity Index (PSI and British Thoracic Society

  10. Nasal septum resection due congenital thickness in foalsRessecção de septo nasal devido ao espessamento congênito em potros

    Directory of Open Access Journals (Sweden)

    Antônio Felipe Paulino de Figueiredo Wouk

    2012-04-01

    ão foi possível introduzir o equipamento na cavidade nasal devido à estenose bilateral. O exame radiográfico confirmou o aumento na espessura do septo nasal. Os animais foram submetidos à cirurgia de ressecção de septo. Para promover uma melhor condição respiratória a traqueostomia foi realizada nos dois potros antes da cirurgia. A técnica cirúrgica utilizada foi modificado da técnica descrita anteriormente DOYLE (2005. Inicialmente foi realizada a trepanação do osso nasal para osteotomia da porção caudal do septo, com auxilio de osteótomo modificado, sendo os limites dorsais e ventrais do septo removidos com uso de fio serra protegido por guias metálicos. Após a recuperação cirúrgica, nos dois casos, o exame clínico mostrou que o fluxo de ar estava normal e sem ruídos permitindo aos potros respirar normalmente. A traqueostomia cicatrizou por segunda intenção. Após oito meses os dois animais respiravam confortavelmente, estando aptos à atividade física. O exame histopatológico não demonstrou sinais de inflamação, neoplasia ou outro tipo de alteração histológica relacionada aos septos, sugerindo espessamento congênito.

  11. Internamento devido a PAC por Streptococcus pneumoniae – Avaliação de factores de mortalidade

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    Sandra Figueiredo

    2008-09-01

    Full Text Available Resumo: A avaliação da gravidade perante qualquer caso de pneumonia adquirida na comunidade (PAC é de suma importância, pois dela decorrem decisões como a necessidade de internamento e o tratamento empírico inicial. Os autores apresentam um estudo retrospectivo, que incluiu doentes internados devido a pneumonia por Streptococcus pneumoniae durante o ano de 2006, no Hospital de São João. A confirmação etiológica de infecção foi feita por isolamentos no sangue, líquido pleural, secreções traqueobrônquicas, lavado brônquico, lavado broncoalveolar e pesquisa de antigenúria. Foram analisados os factores de risco e avaliados, com base nas normas PSI (Pneumonia Severity Index e da British Thoracic Society (BTS -CURB-65. A análise estatística foi efectuada utilizando teste T para amostras independentes e ANOVA, usando o programa de análise estatística SPSS 14.0.Foram incluídos 104 doentes com idade mediana de 63 anos, sendo 67,3% do sexo masculino. O estudo revelou existir uma associação com significado estatístico entre os resultados de PSI e CURB-65 e a evolução para a mortalidade.Apesar da melhoria dos meios diagnósticos e profilácticos, e da terapêutica antibiótica, a pneumonia pneumocócica permanece uma entidade de grande morbilidade e mortalidade. O valor preditivo das normas PSI e CURB-65 foi confirmado nesta população de doentes, documentando uma correlação entre o número de factores de risco e a evolução da doença.Rev Port Pneumol 2008; XIV (5: 601-615 Abstract: Probably the most important decision in the management of Community-Acquired Pneumonia (CAP is patient site of care. Patients with Streptococcus pneumoniae-caused CAP admitted to our hospital between 1st January and 31st December 2006 were retrospectively analysed. Samples of blood, sputum, bronchial and bronchoalveolar lavage and urine were collected for

  12. Technologies for the treatment of the sulfur dioxide and nitrogen oxides generated by the combustion in open chamber; Tecnologias para el tratamiento de dioxido de azufre y oxidos de nitrogeno generados por la combustion en camara abierta

    Energy Technology Data Exchange (ETDEWEB)

    Salazar Villalpando, Maria Dolores [Instituto Mexicano del Petroleo, Mexico, D. F. (Mexico)

    1993-12-31

    In general terms, there are only three ways of avoiding the sulfur dioxide and the nitrogen oxides, generated by the combustion in open chamber, from contaminating the air; the first one is utilizing low sulfur and nitrogen content fuels, the second one is by controlling the parameters that affect the combustion and the third one to treat and/or clean the gases before exhausting them to the air. In this document, some of the treatments for diminishing the pollutant emissions generated by the combustion in open chamber, are presented. [Espanol] En terminos generales, solo existen 3 maneras de evitar que el dioxido de azufre y oxidos de nitrogeno generados por la combustion en camara abierta sigan contaminando el aire, la primera es utilizar un combustible de bajo contenido de azufre y nitrogeno, la segunda es controlar los parametros que afectan la combustion, y la tercera es tratar y/o limpiar los gases antes de emitirlos a la atmosfera. En este documento se presentan algunos tratamientos para disminuir las emisiones de contaminantes generados por la combustion en camara abierta.

  13. Technologies for the treatment of the sulfur dioxide and nitrogen oxides generated by the combustion in open chamber; Tecnologias para el tratamiento de dioxido de azufre y oxidos de nitrogeno generados por la combustion en camara abierta

    Energy Technology Data Exchange (ETDEWEB)

    Salazar Villalpando, Maria Dolores [Instituto Mexicano del Petroleo, Mexico, D. F. (Mexico)

    1992-12-31

    In general terms, there are only three ways of avoiding the sulfur dioxide and the nitrogen oxides, generated by the combustion in open chamber, from contaminating the air; the first one is utilizing low sulfur and nitrogen content fuels, the second one is by controlling the parameters that affect the combustion and the third one to treat and/or clean the gases before exhausting them to the air. In this document, some of the treatments for diminishing the pollutant emissions generated by the combustion in open chamber, are presented. [Espanol] En terminos generales, solo existen 3 maneras de evitar que el dioxido de azufre y oxidos de nitrogeno generados por la combustion en camara abierta sigan contaminando el aire, la primera es utilizar un combustible de bajo contenido de azufre y nitrogeno, la segunda es controlar los parametros que afectan la combustion, y la tercera es tratar y/o limpiar los gases antes de emitirlos a la atmosfera. En este documento se presentan algunos tratamientos para disminuir las emisiones de contaminantes generados por la combustion en camara abierta.

  14. EFEK ANTIPIRETIK KOMBINASI EKSTRAK DAUN COCOR BEBEK (Kalanchoe pinnata L. DAN EKSTRAK DAUN TEMBELEKAN(Lantana camara L. PERS.TERHADAP MARMUT (Cavia porcellus DENGAN DEMAM YANG DIINDUKSI PEPTON

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    Heni Purwitasari

    2017-03-01

    Full Text Available Cocor Bebek (Kalanchoe pinnata L. is a medicinal plant that has been used as traditional medicine for long period, used to fight fever, but it empirically leaves of  Tembelekan (Lantana camara L. are also generally primarily used to treat fever. Research on the effects of the combination of Cocor Bebek’s leaf extract (Kalanchoe pinnata L. and the leaf extract of tembelekan (Lantana camara L. Pers on male guinea pig (Cavia porcellus is induced peptone 5% at a dose of 150 mg / kg body weight. With the aim to determine the effect of the combination and determine the effects of the most effective as an antipyretic. Extracts prepared by maceration method using ethanol 95%. Marmots were divided into 4 groups. Each guinea pig was induced using peptone 5%. The first group was given Na CMC as a negative control group 2nd given a combination of one dose combinations (50 + 720. Group 3 was given a second dose combination (100 + 720. Group-4 were given a 3-dose combination (150 + 720. Temperature measurement is carried out for 2 hours with a 30 minute interval. Data were analyzed temperature measurements were statistically analyzed using ANOVA (Analisys Of Variance. The research result was addressing, that the combination of extracts can reduce fever. The combination is most effective as an antipyretic is cocor duck leaf extract 50 mg and 720 mg tembelekan leaf extract (50 + 720.

  15. Pulpal response of dogs primary teeth to an adhesive system or to a calcium hydroxide cement Resposta pulpar de dentes decíduos de cães a um sistema adesivo ou ao cimento de hidróxido de cálcio

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    Rosângela Almeida RIBEIRO

    2000-03-01

    Full Text Available The aim of this study was to evaluate the pulpal response of dogs primary teeth to an adhesive system or to a calcium hidroxide cement after mechanic exposure of the pulp. Three mongrel dogs were used and ten class V cavities were prepared on their teeth. A mechanic pulp exposure was produced with a sterile exploratory probe in the central portion of each cavity and bleeding was controlled with dry sterile cotton pellets. Enamel, dentin and the site of the pulp exposure of five teeth were etched with 35% phosphoric acid followed by the application of an adhesive system (Scotchbond Multi-Purpose - 3M. In the other five teeth, calcium hydroxide cement (Hydro C - Dentsply was applied on the site of the pulp exposition before application of the adhesive system (Scotchbond Multi-Purpose - 3M. All teeth were restored with a resin composite (Z-100 - 3M. After 7, 30 or 45 days the dogs were anesthetized and perfused with saline followed by a solution of neutral buffered formalin. Maxilla and mandible were sectioned into three parts and placed in a solution for demineralization. Following bone demineralization, all teeth were cut, trimmed, embedded in paraffin and longitudinally cut. Then, the teeth were stained with hematoxilin and eosin and observed under a light microscope. The results obtained with the treatments proposed in this study showed the presence and persistence of an inflammatory response of different intensities at the three experimental periods. There was no variation in the inflammatory response regarding the different treatments performed.O objetivo deste estudo foi de avaliar a resposta pulpar de dentes decíduos de cães à um sistema adesivo ou a um cimento de hidróxido de cálcio após exposição mecânica da polpa. Foram utilizados três cães sem raça definida, e nestes foram realizados dez preparos cavitários classe V. Uma exposição pulpar mecânica foi produzida com uma sonda exploradora esterilizada, na porção central

  16. Simulation and analysis of the tangential flow in the combustion chamber of a steam generator; Simulacion y analisis del flujo tangencial en la camara de combustion de un generador de vapor

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez Ramirez, Isaias

    1997-06-01

    supplying ducts, were obtained, with a maximum discrepancy of 5.5 m/s between the data published by McKenty and Gravel (1997) and this analysis, for the case of combustion gases in the interior of the furnace. Temperature profiles were obtained, which were overestimated in the order of 417 Celsius degrees for the case of the temperature of gases in the center of the combustion chamber, when comparing them with the corresponding ones obtained by McKenty and Gravel (1997). It is speculated that this discrepancy must to be due to the omission of the connection of the radiation model to the global computational model and; the contours of concentration of species for the combustion products in the chamber were considered (carbon dioxide, oxygen and nitrogen), obtaining only the qualitative behavior of these. It is proposed as conclusion that the computational model developed in this thesis work can be used for the estimation of flow of fluids patterns, heat transference and transference of mass of a steam generator VU-60 of the tangential type and similar to the one taken as a base for this analysis. One improvement to the computational model developed could be achieved including the radiation effect, which requires a larger memory capacity of the computer hardware than the one available during the elaboration of this thesis. [Espanol] El presente trabajo de tesis describe la simulacion y analisis de la camara de combustion de un generador de vapor VU-60 del tipo tangencial, el cual esta basado en la solucion de la ecuacion generalizada de transporte, empleando modelos matematicos desarrollados para la caracterizacion de fenomenos fisicos para cerrar los sistemas de ecuaciones gobernantes. Para la solucion de los modelos matematicos y ecuaciones gobernantes se empleo el metodo de volumen finito, el cual se basa en el concepto de volumen de control. Se desarrollo un modelo computacional tridimensional por medio del cual se estimaron los perfiles de velocidad, presion, temperatura

  17. Clinical and pathological aspects of multicentric hemangiosarcoma in a Pinscher dog Sinais neurológicos multifocais devido ao hemangiossarcoma multicêntrico em um cão Pinscher: aspectos clínicos e patológicos

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    B.D.C. Martins

    2013-04-01

    Full Text Available A 3-year-old female Pinscher dog was presented with a history of lameness and pain in hind limbs for one week which acutely progressed to non-ambulatory paraparesis. The dog had been apathetic and anorexic during the six days prior to presentation. The neurological findings were compatible with upper motor neuron signs to the left hind limb due to a spinal cord compressive mass on the twelfth thoracic vertebral body. On the other hand, signs of lower motor neurons to the right hind limb were due to a mass with a pathological fracture in the right proximal femur, compressing the sciatic nerve. A histopathological analysis of all organs revealedthe proliferation of endothelial cells showingin filtrative growth and organization into vascular structures with a solid pattern. In addition, immunohistochemycal analysis revealed low proliferation index and citoplasmatic positivity for CD-31, confirming the vascular nature of the neoplasm. Clinical, histopathological and immunophenotipical findings were consistent with hemangiosarcoma.Uma cadela Pinscher de três anos de idade foi atendida em Hospital Veterinário Escola com histórico de dor nos membros pélvicos com progressão aguda para paraparesia não ambulatória. O animal estava apático e anoréxico há seis dias. Os achados neurológicos foram compatíveis com sinais de lesão de neurônios motores superiores para o membro pélvico esquerdo devido a uma massa no 12º corpo vertebral comprimindo a medula espinhal. Por outro lado, foram observados sinais de lesão de neurônios motores inferiores para o membro pélvico direito devido a uma fratura patológica no colo proximal do fêmur direito que comprimiu o nervo isquiático. Análises histopatológicas de todos os órgãos revelaram proliferação de células endoteliais com crescimento infiltrativo e organização sólida em estruturas vasculares. Adicionalmente, a análise imuno-histoquímica revelou baixa proliferação e marca

  18. Associação de variáveis meteorológicas com os afastamentos do trabalho devido a doenças respiratórias: um estudo entre trabalhadores dos correios de Santa Catarina

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    Daniel Pires Bitencourt

    Full Text Available INTRODUÇÃO: As doenças do aparelho respiratório (DAR em trabalhadores são, com frequência, atribuídas ao ambiente de trabalho ou ao tipo de atividade. Poucos estudos relacionam as DAR com as condições de tempo. OBJETIVO: Este artigo tem como objetivo identificar a existência desta relação através da comparação da taxa de afastamento do trabalho com as médias mensais de variáveis meteorológicas. MÉTODOS: Para tanto, calculou-se a correlação dos afastamentos com as médias mensais de temperatura e umidade, com os valores mínimos mensais de temperatura e umidade e com a maior queda de temperatura em 24h ocorrida no mês. A série de dados meteorológicos com melhor correlação foi dividida em quartis (25% para identificar os valores típicos de afastamento em situações extremas de temperatura ou umidade. Os afatamentos por DAR foram calculados em trabalhadores dos Correios de Santa Catarina e os dados meteorológicos foram obtidos da reanálise de modelos numéricos. O período analisado compreendeu janeiro de 2001 a dezembro de 2007, totalizando 84 meses. RESULTADOS: Os afastamentos do trabalho devido às DAR obtiveram melhor associação, em ordem de importância, com a temperatura média do mês, a temperatura mínima do mês e o maior declínio de temperatura do mês. Todas essas correlações obtiveram significância estatística de 0,1%. A umidade do ar não demonstrou associação com a taxa de afastamento. CONCLUSÃO: Conclui-se que as maiores taxas de afastamento do trabalho devido às DAR ocorrem nos meses mais frios e secos.

  19. Mortalidade por cirrose, câncer hepático e transtornos devidos ao uso de álcool: Carga Global de Doenças no Brasil, 1990 e 2015

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    Ana Paula Souto Melo

    Full Text Available RESUMO: Introdução: O uso de álcool é um dos principais fatores de risco preveníveis para mortalidade ou incapacidade prematuras. Objetivo: Descrever as estimativas de mortalidade e anos de vida perdidos por morte prematura (YLL por cirrose, câncer hepático e transtornos devidos ao uso de álcool no Brasil e suas unidades da federação (UFs, em 1990 e 2015. Métodos: Estudo descritivo com dados do estudo de Carga Global de Doenças (2015 e do Sistema de Informações sobre Mortalidade (SIM. Modelos estatísticos foram empregados para obter estimativas corrigidas de mortalidade pelas causas selecionadas. As taxas de mortalidade foram padronizadas por idade (TMPI. Resultados: Em 1990, foram estimados 16.226 óbitos para as 3 condições (17,0/100 mil habitantes, enquanto em 2015 foram 28.337 (15,7/100 mil habitantes. Houve redução da mortalidade (por 100 mil habitantes por cirrose (de 11,4 para 9,5 e estabilidade por câncer hepático (1,5 e 1,9 e transtornos devidos ao uso de álcool (4,1 e 4,3. As TMPI foram 5,1 vezes maiores entre os homens, e as 5 UFs com maiores TMPI e YLL foram da Região Nordeste: Sergipe, Ceará, Pernambuco, Paraíba e Alagoas. As taxas de mortalidade e de YLL pelas três condições estudadas ascenderam no ranking das causas de óbito, em ambos os sexos, exceto a cirrose no feminino. Conclusão: As três condições estudadas são responsáveis por importante carga de mortalidade prematura no Brasil, principalmente entre homens e residentes na região nordeste. Esses resultados reforçam a necessidade de políticas públicas para o enfrentamento ao consumo nocivo do álcool no Brasil.

  20. Chemical treatment to unclogg dripper irrigation systems due to biological problems Desentupimento de um sistema de irrigação por gotejamento devido a problema de origem biológica

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    Túlio Assunção Pires Ribeiro

    2008-02-01

    Full Text Available Many producers use drippers for trickle irrigation systems for flower production in the field and in protected environments. A frequent problem in this type of irrigation system is the clogging of drippers, which is directly related to water quality and filtering system efficiency. The objective of this study was to conduct an experimental investigation to evaluate the efficiency of using nitric acid and sodium hypochlorite to unclogg drippers due to the use of water with high algae content. The evaluation was conducted in six, 4216 m² greenhouses, each with two sectors comprised of ten spaces or lines, totaling 12 sectors of a dripper irrigation system in a rose producing property of Holambra, State of SP, Brazil. Chemical and physical analyses and the bacteriological count in water were carried out in the three water sources that supply the irrigation system to check the factors causing the clogging. Evaluations were carried out on water distribution uniformity in all sectors before and after chemical treatment in order to evaluate efficiency. The treatment improved water distribution uniformity and a lead to a reduction in the coefficient of variation (CV for dripper flow in all sectors. There was a good correlation between CV and the water distribution uniformity index. Therefore, this is an excellent method to be used to unclogg drippers due to biological problems.Muitos produtores usam gotejadores para irrigação localizada em produção de flores no campo e em ambientes protegidos. Um problema freqüente neste tipo de irrigação é o entupimento dos gotejadores, que está diretamente relacionado à qualidade da água e à deficiência de filtração do sistema. Este trabalho teve como objetivo fazer uma investigação experimental para avaliar a eficiência da utilização de ácido nítrico e de hipoclorito de sódio na desobstrução de gotejadores entupidos, devido à utilização de águas com elevado teor de matéria de origem

  1. Pigmentary retinopathy due to Bardet-Biedl syndrome: case report and literature review Retinopatia pigmentar devido a síndrome de Bardet-Biedl: relato de caso e revisão da literatura

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    Luis Jesuino de Oliveira Andrade

    2009-10-01

    Full Text Available Bardet-Biedl syndrome (BBS is a rare autosomal recessive disorder with clinical and genetic heterogeneity. This syndrome was first described by Laurence and Moon in 1866 and additional cases were described by Bardet and Biedl between 1920 and 1922. The main features are obesity, polydactyly, pigmentary retinopathy, learning disabilities, various degrees of intellectual impairment, hypogonadism, and renal abnormalities. Bardet-Biedl syndrome is both phenotypically and genetically heterogeneous. Clinical diagnosis is based on the presence of 4 of the 5 cardinal features. The authors present a typical case of pigmentary retinopathy due to Bardet-Biedl syndrome and made a brief commentary about the disease's cardinal manifestations.A síndrome de Bardet-Biedl (BBS é uma desordem autossômica recessiva rara, com heterogeneidade clínica e genética. Esta síndrome foi descrita pela primeira vez por Laurence e Moon em 1866 e outros casos foram descritos por Bardet e Biedl entre 1920 e 1922. As principais características são obesidade, polidactilia, retinopatia pigmentar, dificuldades de aprendizagem, graus de deficiência intelectual diversos, hipogonadismo e anomalias renais. Síndrome de Bardet-Biedl é fenotipicamente e geneticamente heterogêneos. O diagnóstico clínico baseia-se na presença de quatro dos cinco sinais principais da síndrome. Os autores apresentam um caso típico de retinopatia pigmentar devido à síndrome de Bardet-Biedl e fazem uma breve revisão sobre as manifestações da síndrome com especial atenção à retinopatia pigmentar.

  2. Maternidade e hanseníase: as vivências de separação devido ao isolamento compulsório Being a mother with leprosy: the experiences of separation due to compulsory isolation

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    Suellen Santos Lima de Almeida

    2012-08-01

    Full Text Available As mulheres portadoras de hanseníase, durante grande parte do século XX, não puderam exercer a maternidade devido à política de isolamento compulsório dos doentes adotada para controlar a doença. Os filhos ao nascerem eram levados para os preventórios e o contato com estes era realizado pelo olhar. Visando compreender a experiência da maternidade no hospital colônia foi realizada pesquisa narrativa com três mães que viveram o período de internação compulsória. Os discursos revelam dois momentos distintos da vivência de maternidade: a separação dos filhos com sua posterior volta para casa e a adoção de crianças para realizar a maternidade. Considera-se que a adoção promoveu o encontro com o sentido da existência que havia sido rompido e possibilitou a experiência de ser-mãe.In the twentieth century, women with leprosy could not carry on their maternity because of the statement of compulsory isolation of patients, adopted to control the disease. Their children were taken at birth to prevention centers and the contact of mothers with their babies was only visual. In order to understand the experience of maternity in the leprosaria it was carried out an investigated narrative research with three mothers who lived through the period of compulsory internment. The speeches reveal two distinct moments in the experience of motherhood: the separation of the children with their subsequent return to home and the adoption of other children to achieve motherhood. It is considered that the adoption has promoted the meeting with the meaning of existence that had been broken and allowed the experience of being a parent.

  3. O Sistema Asclepias curassavica L., Epidendrum fulgens Brongn. e Lantana camara L. constitui um complexo mimético, com borboletas como operadores? um estudo no Parque Estadual de Itapeva, Torres, RS

    OpenAIRE

    Daniela Fuhro

    2006-01-01

    O mimetismo é uma adaptação onde duas ou mais espécies, que podem pertencer a grupos taxonômicos distintos, assemelham-se no padrão geral de cor e/ou forma e que devido a isso são confundidas por um outro organismo. Os tipos clássicos de mimetismo, Batesiano e Mülleriano, nem sempre se ajustam a estudos com flores; esta limitação, todavia, não afeta o chamado Sistema Tripartido. O Sistema Tripartido foi proposto originalmente por Wolfgang Wickler (1968) e aperfeiçoado por Richard I. Vane Righ...

  4. Traffic effects on the soil preconsolidation pressure due to eucalyptus harvest operations Efeito do tráfego nas pressões de preconsolidação do solo devido as operações de colheita do eucalyptus

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    Moacir de Souza Dias Junior

    2005-06-01

    Full Text Available One of the limitations for reaching sustainable forest development is related to the traffic of machines and vehicles during harvest operations and wood transport, which may cause soil structure degradation. Seeking a way to analyze this problem, the objective of this study was to determine the traffic effects due to harvest operations and wood transport, on the preconsolidation pressure (sigmap in a Typic Acrustox cultivated with eucalyptus. This study was conducted using undisturbed soil samples collected at the 0.1-0.125 m depth. Undisturbed soil samples were used in the uniaxial compression tests. Soil sampling consisted of two stages, before and after the mechanized harvest operations. The traffic effects on the sigmap in the dry season indicated that the soil compaction process was neither evident nor important. However, in the rainy season the traffic effects on the sigmap indicated that the operations performed with Harvester and Forwarder caused greater soil compaction than those with Motorized Saw and Manual, which caused less soil compaction.Uma das limitações para alcançar o desenvolvimento florestal sustentável está relacionado ao tráfico de máquinas e veículos durante as operações de colheita e transporte de madeira que podem causar degradação da estrutura do solo. Buscando uma maneira para analisar este problema, o objetivo deste estudo foi determinar o efeito do tráfego devido a operações de colheita e transporte de madeira, nas pressões de preconsolidação (sigmap de um Latosol Vermelho-Amarelo, cultivado com Eucalyptus. Este estudo foi realizado usando amostras de solo indeformadas coletadas a 0,10-0,125 m de profundidade. As amostras indeformadas foram usadas nos ensaios de compressão de uniaxial. A amostragem consistiu de duas fases, antes e depois das operações de colheita mecanizada. As alterações causadas pelo tráfego nas sigmap na estação seca indicaram que o processo de compactação não foi

  5. Preliminary experiments with a solid-state ionization chamber; Experiences preliminaires au moyen d'une chambre d'ionisation a milieu solide; Predvaritel'nye opyty s tverdoj ionizatsionnoj kameroj; Experimentos preliminares con una camara de ionizacion en estado solido

    Energy Technology Data Exchange (ETDEWEB)

    Griffiths, R J; Batty, C J [National Institute for Research and Nuclear Science, Harwell (United Kingdom); Gibbons, P E; Northrop, D C [Service' s Electronics Research Laboratory, Baldock, Didcot (United Kingdom)

    1962-04-15

    A solid-state ionization chamber has been made by diffusing phosphorus into high-resistivity silicon to form ohmic contacts. Such a detector has been successfully used to detect 30-MeV protons. Preliminary results are given and discussed. (author) [French] Une chambre d'ionisation a milieu solide a ete realisee par diffusion de phosphore dans du silicium de haute resistivite pour former des contacts ohmiques. Un detecteur de cette nature a ete utilise avec succes pour detecter des protons de 30 MeV. Les auteurs presentent les resultats preliminaires obtenus. (author) [Spanish] Se ha construido una camara de ionizacion en estado solido, por difusion de fosforo en silicio de elevada resistividad para formar contactos ohmicos. Con esta camara se han logrado detectar protones de 30 MeV. Los autores presentan y examinan los resultados preliminares obtenidos. (author) [Russian] Tverdaya ionizatsionnaya kamera izgotovlena putem vklyucheniya fosfora v kremnij s vysokoj udel'noj soprotivlyaemost'yu dlya obrazovaniya omicheskikh kontaktov. Takoj detektor uspeshno primenyaetsya dlya obnaruzheniya protonov v 30 mehv. Predstavleny i obsuzhdayutsya predvaritel'nye rezul'taty. (author)

  6. Recuperação de gotejadores obstruídos devido à utilização de águas ferruginosas Recovery of drippers clogged by use of water high in iron content

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    Gustavo H. S. Vieira

    2004-04-01

    Full Text Available Desenvolveu-se este trabalho com o objetivo de se avaliar a eficiência da utilização de ácido fosfórico, de hipoclorito de sódio e de um produto comercial, além do impacto mecânico na desobstrução de gotejadores entupidos, devido à utilização de águas com elevado teor de ferro. O trabalho foi realizado na Fazenda Vista Alegre, localizada em Jaboticatubas, MG. Um sistema de irrigação por gotejamento foi adaptado para realização dos testes com oito tratamentos, sendo sete com aplicação de produtos químicos e um com impacto mecânico. Para os tratamentos químicos, utilizaram-se: o ácido fosfórico com pH 2 e pH 3; o hipoclorito de sódio com as dosagens de 100, 50 e 25 mg L-1 de cloro; e Reciclean com as dosagens de 50 e 25 mg L-1. Diante dos resultados obtidos, conclui-se: o tratamento com ácido fosfórico em pH 2 forneceu o melhor resultado quanto ao aumento da uniformidade de aplicação de água pelo sistema, apresentando o maior aumento nos valores de coeficiente de uniformidade de distribuição (CUD e coeficiente de uniformidade de Christiansen (CUC; entretanto, com custo elevado. O tratamento com 25 mg L-1 de cloro apresentou a melhor relação benefício/custo, sendo o mais econômico e o segundo melhor quanto à melhoria da uniformidade de irrigação do sistema. O impacto mecânico é uma alternativa para recuperação de sistemas de irrigação por gotejamento em geral, com destaque para sistemas de cultivos orgânicos.A study was carried out (Reciclean to evaluate the efficiency of using the phosphoric acid, sodium hypochlorite, a commercial product and mechanical impact for cleaning the drippers in which the clogging was due to the presence of high iron content in water. The experiment was set up in the Vista Alegre Farm, located in Jaboticatubas County - Minas Gerais State. A drip irrigation system was adopted for the accomplishment of the tests. Eight treatments were tested, of which, seven with application

  7. Peroneal nerve palsy due to compartment syndrome after facial plastic surgery Paralisia de nervo fibular devido a síndrome compartimental após cirurgia plástica da face

    Directory of Open Access Journals (Sweden)

    Clécio O. Godeiro-Júnior

    2007-09-01

    índrome compartimental crônica. Ele fazia uso de anabolizantes e venlafaxina, não relatado no início do quadro, e a agitação poderia ser explicada por uma síndrome serotoninérgia desencadeada pela interação deste último medicamento e haloperidol. A rabdomiólise secundária a estes eventos causou edema e isquemia nos compartimentos anteriores de ambos os membros inferiores, levando a uma compressão secundária do nervo fibular. O caso em questão ilustra a importância do diagnóstico precoce da síndrome compartimental pois, caso contrário, mesmo com fasciotomia, uma complicação permanente devido à compressão de nervos periféricos pode se estabelecer.

  8. Células madres pulpares: describiendo y descubriendo potencialidades

    OpenAIRE

    Merino, Graciela Mónica; Dewey, Ricardo Alfredo; Mayocchi, Karina; Butler, Teresa Adela; Dorati, Pablo; Basal, Roxana Lía; Paggi, Ricardo; Cantarini, Luis Martín; Pinola, Lidia; Micinquevich, Susana

    2015-01-01

    La evidencia científica ha demostrado que las células madre (CM) ofrecen una importante innovación en la investigación odontológica. Ellas pueden diferenciarse posibilitando el reemplazo de tejidos afectados aunque sean de otros linajes celulares. Las de origen dental por su multipotencialidad pueden formar células con carácter osteo/odontogénico, adipogénico y neurogénico. La pulpa dental ofrece células madre en baja concentración, siendo más proliferativas aquellas que dan origen a la coron...

  9. Efectos del blanqueamiento dental sobre el tejido pulpar

    OpenAIRE

    Cedillo Orellana, Sara Ivanna

    2016-01-01

    El blanqueamiento dental es un proceso dinámico que busca la eliminación de manchas de la estructura dental mediante el empleo de productos químicos, principalmente el peróxido de hidrógeno, el cual fue utilizado por primera vez en 1884 y hasta la fecha continúa siendo el principal componente activo de muchos productos usados para terapias de blanqueamiento dental, y es utilizado en su forma pura o como producto final de la degradación de otras sustancias empleadas para blanqueamiento, como...

  10. Histologia e fisiologia da dor de origem pulpar

    OpenAIRE

    Fernandes, Bruno Miguel Oliveira

    2015-01-01

    Projeto de Pós-Graduação/Dissertação apresentado à Universidade Fernando Pessoa como parte dos requisitos para obtenção do grau de Mestre em Medicina Dentária Na prática clínica dentária é comum observar que um grande número de pacientes que solicitam uma consulta sem agendamento se deve a uma urgência ou emergência. Normalmente, esses pacientes chegam de maneira inesperada e com dores severas, alterando a rotina da agenda do dentista e, simultaneamente, criando situações de tensão que afe...

  11. 1701-IJBCS-Article-Camara Mameri

    African Journals Online (AJOL)

    hp

    d'Ivoire. Agronomie Africaine, 19(2):. 173-185. Gamouh A. 2005. Effets comparés et interactifs des pesticides et facteurs physiques sur la minéralisation de substrats carbonés dans le sol. Bull. Inst. Scientifique Sci. Vie, 26-27. Hartemink AE, O'Sullivan JN. 2001. Leaf litter decomposition of Piper aduncum,. Glyricidia sepium.

  12. Tentativa de infanticídio por um macho dominante de Alouatta caraya (Humboldt (Primates, Atelidae em um infante extra-grupo devido a influência do observador Infanticide attempt by a dominant male of Alouatta caraya (Humboldt (Primates, Atelidae against an extra-group infant due to the influence of the observer

    Directory of Open Access Journals (Sweden)

    Lucas M. Aguiar

    2005-12-01

    Full Text Available Este trabalho relata um caso de tentativa de infanticídio por um macho residente e dominante de um grupo de Alouatta caraya (Humboldt, 1812 em um infante extra-grupo, em ilha do rio Paraná, Paraná, Brasil. O encontro do par fêmea-infante com o macho residente foi propiciado pela interferência humana. Devido às circunstâncias em que ocorreu o fato e a posição hierárquica do agressor, a hipótese de patologia social pareceu plausível na explicação do comportamento.This work reports on an infanticide attempt by a dominant resident male in a group of Alouatta caraya (Humboldt, 1812 on an extra-group infant in an Island in the Paraná river, Paraná, Brazil. The encounter of an infant-female pair with a resident male was brought about by human interference. Give the circumstances in which the event ocurred and the hierarchical position of the agressor, the social pathology hypothesis seems the most plausible explanation for such behavior.

  13. As possíveis alterações microclimáticas devido a formação do lago artificial da hidrelétrica de Tucuruí -PA The possible impacts on the microclimate due to the artificial lake from Tucuruí's dam

    Directory of Open Access Journals (Sweden)

    Fabio Sanches

    2005-01-01

    Full Text Available Existem muitas preocupações ecológicas do impacto que a construção de grandes lagos na Amazônia podem provocar, principalmente relacionadas ao microclima. Este estudo visa aumentar o conhecimento científico sobre a distribuição de chuvas antes e depois da formação do lago artificial da UHE Tucuruí-PA. Foram utilizados dados diários de precipitação dos períodos de 1972 a 1983 (pré-enchimento e de 1984 a 1996 (pós-enchimento para as cidades de Tucuruí e Marabá-PA. Comparando-se os totais mensais (pré e pós-enchimento, não se observam diferenças estatisticamente significantes (foram aplicados os testes de Fisher e Man-Whitney. Analisando-se a ocorrência de dias com precipitação superior a 5 e 25 mm.dia-1, também não se observam diferenças estatisticamente significativas. Há um leve aumento do número de dias com chuvas leves no final período sêco após a formação do lago, talvez devido a alta evaporação do lago artificial. Também não se observou modificações do início ou final da estação chuvosa.There are a lot of ecological concern about the ecological impacts due to an artificial lake in Amazonia, especially related with the microclimate. This study aims to increase the scientific knowledge of the rainfall distribution prior and post flooding of the UHE Tucuruí-PA. Daily rainfall from 1972 until 1983 (prior inundation and from 1984 until 1996 (post inundation for Tucuruí and Marabá-PA. Comparing the monthly totals (prior and post, there is no statistical differences between the averages (using the statistical tests from Fisher and Man-Whitney. Analyzing the number of days with rainfall higher than 5 and 25 mm.day-1, there are also no statistical differences. It was observed a small increase of light rain during the end of the dry season. Also, the are no signal related to the modification of the onset or end from the rainy season.

  14. Posição socioeconômica e duração do benefício por incapacidade devido a doenças musculoesqueléticas relacionadas ao trabalho Socioeconomic position and duration of disability benefit due to work-related musculoskeletal disorders

    Directory of Open Access Journals (Sweden)

    Norma Suely Souto Souza

    2012-02-01

    Full Text Available Neste estudo, estima-se o efeito da posição socioeconômica sobre a duração dos benefícios por incapacidade devido a doenças musculoesqueléticas. Dados de um inquérito conduzido pela Auditoria Regional do Instituto Nacional do Seguro Social, com todos os segurados que receberam benefício por incapacidade temporária por doenças musculoesqueléticas da região cervical e membros superiores, em 2008, juntamente com os registros administrativos, foram utilizados para formar uma coorte de 563 trabalhadores. Todos eram residentes em Salvador, Bahia. Entre os trabalhadores sindicalizados e com alta demanda psicossocial no trabalho, a posição socioeconômica se associava positivamente com a duração do benefício (RR = 1,89; IC95%: 1,25-2,87. Esses resultados correspondem ou a uma situação de iniquidade ou ao uso desnecessário do seguro pelos trabalhadores com posição socioeconômica alta. Investigações futuras que visem a elucidar as diferenças na utilização dos benefícios são necessárias para subsidiar a abordagem apropriada dessa questão pelos gestores do seguro social.This study estimated the effect of socioeconomic position on the duration of disability benefits due to musculoskeletal disorders affecting the neck and/or upper limbs. A cohort study including 563 insured workers from the city of Salvador, Bahia, Brazil, registered inthe General Social Security System and who received temporary disability benefits due to musculoskeletal disorders affecting the neck and/or upper limbs, , was performedin 2008 using data from the National Social Security Institute. The results show that among union member workers with high psychosocial demands at work, those with low socioeconomic status are almost twice as likely to receive benefit for a shorter period of time compared to those with a higher socioeconomic position (RR = 1.89; 95%CI: 1.25-2.87. These results reveal aninequitable situation or unnecessary use of insurance for

  15. Aplicação de programa educativo multidisciplinar em gestações de alto risco devido a doenças endócrinas Application of multidisciplinary educational program in high-risk pregnancies due to endocrine diseases

    Directory of Open Access Journals (Sweden)

    Alina Coutinho Rodrigues Feitosa

    2010-10-01

    Full Text Available OBJETIVO: avaliar a aplicação de um programa de intervenção multidisciplinar educativo em mulheres com gestação de alto risco devido a doenças endócrinas. MÉTODOS: avaliamos retrospectivamente a aplicação de um programa educativo multidisciplinar em 185 gestantes com doenças endócrinas referenciadas para uma maternidade especializada em gestação de alto risco. As gestantes receberam atenção pré-natal multidisciplinar por times compostos por endocrinologistas, obstetras, ultrassonografistas, enfermeiras e nutricionistas. Informações orais e escritas sobre hábitos saudáveis, cuidados com diabetes, uso de adoçantes artificiais e exercícios na gestação foram passadas na primeira consulta endocrinológica. Plano nutricional individualizado foi feito em primeira visita à nutricionista. Nas reavaliações mensais com nutricionista e quinzenais com endocrinologista, as informações sobre mudanças saudáveis no estilo de vida eram reforçadas e o peso registrado. O grau de aderência à dieta e atividade física foi autorreferido. Comparou-se o peso semanal antes e após a intervenção multidisciplinar, peso fetal ao nascimento, taxa de macrossomia e baixo peso, e a frequência de parto cesário nas quatro categorias de índice de massa corpórea (IMC pré-gestacional (30 kg/m². RESULTADOS: a principal patologia de encaminhamento foi o diabetes (84,9%. Um terço das gestantes (31,2% era composto por portadoras de sobrepeso e 42,5% tinham obesidade pré-gestacional. A maior parte das gestantes foi vista pela primeira vez pela equipe multidisciplinar no terceiro trimestre (64,1%, e 50,5% delas excederam o ganho de peso recomendado para toda a gestação à primeira avaliação. Gestantes obesas excederam o ganho de peso recomendado em 62,5% dos casos. Após a intervenção multidisciplinar, o percentual de gestantes que excedeu o ganho de peso semanal recomendado reduziu em todas as categorias de IMC pré-gestacional (IMCPG

  16. The luminescent chamber and its use in high-energy physics experiments; La chambre a luminescence: son emploi dans les experiences de physique des hautes energies; Lyuminestsentnaya kamera i ee ispol'zovanie v ehksperimentakh, provodimykh v fizike vysokikh ehnergij; La camara luminiscente y su empleo en experimentos de fisica de elevada energia

    Energy Technology Data Exchange (ETDEWEB)

    Jones, L W; Perl, M L [Randall Laboratory of Physics, University of Michigan, Ann Arbor, MI (United States); Lawrence Radiation Laboratory, University of California, Berkeley, CA (United States)

    1962-04-15

    electronique du compteur a scintillations. Les auteurs exposent les travaux de preparation et d'execution qui ont ete necessaires pour mener ces experiences a bonne fin; ils donnent, en particulier, les details voulus sur les tubes a rayons cathodiques, les compteurs a scintillations et les systemes electroniques utilises. L'analyse de photographies de trajectoires leur a permis d'etudier, notamment, le degre de precision qui peut etre atteint et la valeur des resultats physiques qui peuvent etre obtenus. Enfin, ils explorent les possibilites de developpement qui s'offrent a la chambre a luminescence, compte tenu des tubes renforcateurs d'image et des scintillateurs actuellement a l'etude. Ils analysent le role que la chambre a luminescence est appelee a jouer a l'avenir dans les experiences du domaine des grandes energies en comparaison avec la chambre a etincelles et les autres detecteurs. (author) [Spanish] Por primera vez se ha empleado una camara luminescente en experimentos de fisica con particulas de elevada energia. En el Bevatron del Lawrence Radiation Laboratory se fotografiaron trazas de particulas en cristales de yoduro sodico activado por medio de un sistema en cascada de tres tubos intensificadores de imagen. En un experimento se estudio la dispersion elastica pion-proton utilizando dos conjuntos de centelladores, cada uno de 20 cm de longitud. Uno para observar el pion dispersado y, el otro, el proton de retroceso procedente de un blanco de hidrogeno liquido. Los contadores de centelleo seleccionaban unicamente los sucesos casi coplanares que habian de ser registrados; no obstante, respecto de la dispersion inelastica, el criterio definitivo era la cinematica de las trazas registradas. Se fotografiaron alrededor de 1000 sucesos elasticos correspondientes cada uno a tres cantidades de movimiento del pion incidente hasta 2,5 MeV/c. En un segundo experimento se utilizo unicamente un conjunto de centelleadores de 10 x 10 x 20 cm{sup 3} para observar el frenado de

  17. Changes in the internal resistance of a single chamber microbial fuel cell associated with architectural changes and inoculation; Cambios en la resistencia interna de una celda de combustible microbiana de una camara asociados a cambios de arquitectura y tipo de inoculo

    Energy Technology Data Exchange (ETDEWEB)

    Vazquez Larios, A.L.; Vazquez-Huerta, G.; Esparza-Garcia, F.; Solorza-Feria, O.; Poggi Varaldo, H.M. [Centro de Investigacion y de Estudios Avanzados del IPN, Mexico D.F. (Mexico)]. E-mail: hectorpoggi2001@gmail.com; linevazquez@yahoo.com.mx

    2009-09-15

    The objective of this work was to electrochemically characterize a new type of microbial fuel cell (MFC-A) and evaluate the effect of three inoculated types on internal resistance (Ir). The results were compared with those from a standard fuel cell (MFC-B). The MFC-A consisted of a horizontal acrylate cylinder equipped with two sandwiched electrode systems (each with a anode proton exchange membrane-cathode) at each end of the chamber. The MFC-B consisted of an anode and cathode each placed at opposing faces of the chamber, separated by 78 mm. The Ir of the cells were determined using a polarization curve. The inoculates were from continuous complete-mix reactors, biomass in suspension, at the laboratory scale. The inoculate with the lowest Ir value (1 200 and 3900 {Omega}) was sulfate reduction (SR-In). The second corresponded to methanogen inoculated cells (M-In) with Ir of 5300 and 7500 {Omega}. Aerobic inoculated cells (A-IN) had extremely high Ir values, 100000 and 130000 {Omega} for MFC-A and MFC-B, respectively. The Ir for all the inoculates was the lowest in the MFC-A, attributed to the change in the cell's architecture and the design of the electrodes. These results are encouraging since a decrease in Ir is required to increase the power and efficiency of a microbial fuel cell. [Spanish] El objetivo de este trabajo fue caracterizar electroquimicamente una celda de combustible microbiana de nuevo tipo (CCM-A), y evaluar el efecto de tres tipos de inoculos sobre la resistencia interna (R{sub i}). Los resultados fueron comparados con los de una celda de combustible estandar (CCM-B). La CCM-A consistio de un cilindro horizontal de acrilato, equipado con dos sistemas de electrodos emparedados (cada uno con catodo/membrana de intercambio protonico/anodo) en cada uno de los extremos de la camara. La CCM-B consistio de un anodo y un catodo colocados cada uno en las caras opuestas de la celda, separados por 78 mm. Las Ri de las celdas fueron determinadas por

  18. Impacts of climate change on invasive Lantana camara L ...

    African Journals Online (AJOL)

    staylor

    lantana's potential distribution may expand further inland into new areas in KwaZulu-Natal and ... particularly prominent in the savannah and Indian Ocean ... invaders on biodiversity, water resources and rangeland ..... modelling and uncertainty in future global greenhouse gas emission patterns (Kriticos et al., 2006).

  19. Allelopathic Effects of Lantana (Lantana camara L.) Leaf Extracts on ...

    African Journals Online (AJOL)

    Bheema

    In contrast, tef plants had reduced root growth in various leaf extracts with the ... grows under a wide range of climate conditions and occurs on a variety of soil types ... prepared by soaking 100g fresh leaves of lantana with 500 ml distilled water .... Relative elongation ratio (RER) of root and shoot (percent of control) of three.

  20. Gridded Ionization Chamber; Camara de ionizacion con reja

    Energy Technology Data Exchange (ETDEWEB)

    Manero Amoros, F

    1962-07-01

    In the present paper the working principles of a gridded ionization chamber are given, and all the different factors that determine its resolution power are analyzed in detail. One of these devices, built in the Physics Division of the JEN and designed specially for use in measurements of alpha spectroscopy, is described. finally the main applications, in which the chamber can be used, are shown. (Author) 17 refs.

  1. Lantana camara L. (Verbenaceae) invasion along streams in a ...

    Indian Academy of Sciences (India)

    Streams are periodically disturbed due to flooding, act as edges between habitats and also facilitate the dispersal of propagules, thus being potentially more vulnerable to invasions than adjoining regions. We used a landscape-wide transect-based sampling strategy and a mixed effects modelling approach to understand ...

  2. C:\\Users\\AISA\\Desktop\\M. CAMARA.xps

    African Journals Online (AJOL)

    AISA

    plus rapidement le capital investi dans l'établissement de la ... hydriques conduisent à l'arrêt de croissance puis à la mort des .... les plans humain et financier, afin de mieux cibler les actions de ... Rentabilité économique des techniques.

  3. Two New Types of Detector for X- or Gamma-Ray Cameras; Deux Nouveaux Types de Detecteurs pour Camera a Rayons X ou {gamma}; O dvukh novykh tipov detektorov dlya rentgenovskikh ili gamma-kamer; Dos Nuevos Tipos de Detector para Camaras de Rayos X o Gamma

    Energy Technology Data Exchange (ETDEWEB)

    Kellershohn, C.; Desgrez, A. [Departement de Biologie, Service Hospitalier Frederic Joliot (France); Lansiart, A. [Departement d' Electronique, Centre d' Etudes Nucleaires de Saclay (France)

    1964-10-15

    celle due au bruit du tube Thomson. Seule la premiere declenche l'ouverture du tube obturateur. Comme la duree de cette ouverture est extremement courte, le rapport signal/bruit de cet ensemble detecteur est assez eleve pour obtenir une image au moyen d'un appareil photographique ouvert en permanence sur l'ecran terminal du tube obturateur. Les caracteristiques de ces deux types de detecteur et les resultats preliminaires obtenus sont discutes. (author) [Spanish] Las camaras de rayos X o {gamma} estan constituidas esencialmente por un dispositivo optico, consistente en un orificio o una rejilla, asociado a un detector. Los autores proponen dos tipos de detector completamente distintos del dispositivo de Anger, que hasta ahora es el unico utilizado en la practica. El primero consiste en una camara de chispa autodisparada, de unos 20 cm de diametro, llena de un gas noble (argon o xenon). Contiene un catodo y dos rejillas. Entre el catodo y la segunda rejilla hay una diferencia de potencial de varios kilovoltios, algo inferior a la tension de descarga. Bajo la accion de los fotones X o {gamma} de poca energia, el primer espacio catodo-rejilla sirve de fuente de electrones. Se puede tambien utilizar un catodo contraplacado con un metal de elevado numero atomico o un cristal centelleador asociado a un fotocatodo. Convenientemente amplificado, el incremento brusco de las cargas debido a la multiplicacion de los electrones en la avalancha de Townsend provoca con un retardo de una fraccion de microsegundo una chispa bien localizada. La imagen se obtiene por medio de un aparato fotografico cuyo*obturador permanece constantemente abierto. El segundo tipo de detector consiste en un cristal de Csl (TI) asociado al fotocatodo de un tubo de Thomson de enfoque electrostatico, de 20 cm de diametro. La imagen que aparece en la pantalla secundaria de este tubo es transferida por un dispositivo optico al fotocatodo de un tubo de campos electrico y magnetico paralelos, de la English

  4. Heating of a Dense Plasma in a Metallic Chamber; Chauffage d'un Plasma dense dans une Chambre Metallique; 041d 0410 0413 0420 0415 0412 041f 041b 041e 0422 041d 041e 0419 041f 041b 0410 0417 041c 042b 0412 041c 0415 0422 0410 041b 041b 0418 0427 0415 0421 041a 041e 0419 041a 0410 041c 0415 0420 0415 ; Calentamiento de un Plasma Denso en una Camara Metalica

    Energy Technology Data Exchange (ETDEWEB)

    Shvets, O. M.; Tarasenko, V. F.; Ovchinnikov, S. S.; Tolok, V. T. [Fiziko-Tehnicheskij Institut AN USSR, Khar' kov, USSR (Ukraine)

    1966-04-15

    d'alimentation a pointe d'aluminium. Les electrodes sont branchees sur un generateur haute frequence par l'intermediaire d'un condensateur isolant. La chambre est placee a l'interieur d'un soleno'ide produisant un champ magnetique dont l'intensite peut etre reglee de facon continue entre zero et 2500 Oe. Les auteurs ont choisi la configuration du champ en fonction des conditions necessaires a la generation et a l'absorption des ondes cyclotroniques des ions (le champ limite se situe au centre du solenoiede). On a utilise l'hydrogene comme gaz de travail, et sa pression a ete main- . tenue entre 10{sup -4} et 10{sup -2} Torr au moyen d'un mecanisme de fuite fonctionnant en regime stationnaire. Pour produire un plasma isole des parois de la chambre, les auteurs ont utilise une decharge haute frequence qui, en raison des qualites du plasma, cree une difference de potentiel constante entre les electrodes et la chambre. Il en resulte l'apparition entre les electrodes d'electrons qui oscillent le long des lignes de force du champ magnetique et produisent un degre eleve d'ionisation du gaz entre les electrodes. Il se forme sur l'axe de la chambre a vide une colonne de plasma dense dont le diametre est determine par le diametre des electrodes. Les auteurs font des recherches sur le spectre du rayonnement de decharge; ils determinent la densite du plasma d'apres l'elargissement de Stark de la raie H{sub {beta}} et la temperature des electrons du plasma d'apres ' le rapport des intensites du singulet et du triplet de l'helium. Les auteurs mesurent les flux d'atomes neutres rapides formes au cours de l'echange de charges des ions hydrogene sur le gaz neutre et, a l'aide de sondes speciales, les energies transversales des ions en fonction de l'intensite du champ magnetique et d'autres parametres. (author) [Spanish] En la memoria se exponen los resultados de experimentos sobre el calentamiento por alta frecuencia de un plasma en una instalacion que consiste en una camara de

  5. A Scintillation Camera for Kinetic Studies of the Distribution of Radioactive Nuclides in the Brain; Chambre a Scintillation pour des Etudes sur la Cinetique de la Repartition des Radionucleides dans le Cerveau; Stsintillyatsionnaya kamera dlya kineticheskogo issledovaniya raspredeleniya radioaktivnykh izotopov v tkani mozga; Camara de Centelleo para Estudiar la Cinetica de la Distribucion de Radionuclidos en el Cerebro

    Energy Technology Data Exchange (ETDEWEB)

    Gross, W. [Radiological Research Laboratory, Department Of Radiology, Columbia University, New York, NY (United States); Schlesinger, E. B.; De Boves, S. [Department of Neurological Surgery, Columbia University, New York, NY (United States)

    1964-10-15

    la repartition de l'activite. (author) [Spanish] Los autores han construido una camara de centelleo especialmente concebida para el estudio de la cinetica de la distribucion de radionuclidos en el cerebro. Este dispositivo contiene dos series de cristales de yoduro de sodio activados por talio, de 3/4 x 1 pulg; cada serie comprende 63 cristales dispuestos en 7 filas de 9 cristales con una distancia de 1 pulg entre los centros. Las dos series pueden colocarse de modo que sea posible obtener vistas-simultaneas de dos caras laterales, o de una cara lateral y una posteroanterior (anteroposterior). El campo de vision de cada cristal esta limitado por un colimador de 19 canales conicos cuyos ejes son paralelos entre sf. Este montaje da una respuesta practicamente uniforme a todas las distancias hasta 4 pulg desde el frente del colimador, para una fuente contenida en un tumor simulado. Esta respuesta es suficientemente amplia para evitar zonas 'mu ertas' significativas y ,al mismo tiempo,bastante estrecha para poder observar con exactitud la distribucion de la actividad en unos pocos minutos si se emplean dosis normales de yodo-131 como indicador. Cada cristal esta acoplado opticamente a su propio fotomultiplicador, constituyendo una unidad. Los impulsos de salida de los fotomultiplicadores son analizados mediante discriminadores; la informacion se almacena en forma numerica en una cuarta parte de la memoria de un analizador de amplitud de impulsos de 512 canales. Como este aparato puede aceptar impulsos coincidentes en el tiempo o procedentes de varios detectores, las perdidas son despreciables. La lectura puede efectuarse de distintas maneras. En forma numerica puede obtenerse ya sea un regristro dactilografiado o una cinta de papel perforado. Esta ultima puede introducirse en el aparato para una nueva lectura. En forma analogica, la lectura se hace en un osciloscopio de gran pantalla. Se desenfoca el haz del osciloscopio y se producen dos reticulados de 63 puntos para

  6. PROCESSO CONSTITUCIONAL: o processo como locus devido para o exercício da democracia

    OpenAIRE

    Silva, Fernando Laércio Alves da; Universidade Federal de Viçosa

    2015-01-01

    Em 1984, José Alfredo de Oliveira Baracho publicou, no Brasil, a obra intitulada Processo Constitucional, por meio da qual pioneiramente apresentou os elementos de conexão entre Constituição e Processo, levando a uma radical mudança na perspectiva pela qual se concebe o Direito Processual e sua importância para a construção do Estado Democrático de Direito. Mais de trinta anos depois, intensas tem sido as pesquisas jurídicas a partir da teoria do processo constitucional não apenas nos tradici...

  7. Insucessos em empreendimentos nucleares devido a falhas em processos de Comunicação Pública

    OpenAIRE

    Ferreira,Vinícius V. M.; Soares,Wellington A.

    2012-01-01

    A energia nuclear é um tema amplamente discutido em todo o mundo. O acidente nuclear de Chernobyl e o acidente radiológico de Goiânia contribuíram decisivamente para que a sociedade brasileira tivesse uma imagem negativa sobre o tema. A operação da usina de Angra 3, atualmente em obras, está vinculada à construção de um repositório para armazenar os rejeitos radioativos, o que provavelmente será explorado pelos opositores do setor nuclear. Um dos grandes desafios dos profissionais envolvidos ...

  8. Public exposure due to the transport of radiopharmaceuticals; Exposicao do publico devido ao transporte de radiofarmacos

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigues, Demerval L.; Carneiro, Janete C.G.G.; Sanches, Matias P.; Sordi, Gian Maria A.A., E-mail: dlrodri@ipen.b, E-mail: janetegc@ipen.b, E-mail: msanches@ipen.b, E-mail: gsordi@ipen.b [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2011-10-26

    This paper estimate the radiological impact resulting from radiopharmaceuticals transport from the IPEN to some destinations defined a priori. So, doses were estimated in the public individuals, which are in the streets and vehicles that transit near the public transport, alongside the itinerary went through by packages, during the realization of radiopharmaceuticals transport

  9. Falhas de estruturas de aço soldadas devido a reduzida ductilidade

    Directory of Open Access Journals (Sweden)

    Ivan Guerra Machado

    2013-12-01

    Full Text Available O principal propósito deste artigo é demonstrar para os (as engenheiros(as projetistas e de soldagem, que numa estrutura de aço estrutural soldada a ductilidade possui importância equivalente ou ainda maior do que a resistência e a rigidez. Porém, o elevado nível requerido para a ductilidade não pode ser somente dos metais base e de solda. A análise tem que ser abrangente, envolvendo todos os componentes e também a estrutura completa.

  10. Revisão bibliográfica sobre a anatomia pulpar da raiz mesio vestibular dos primeiros molares superiores

    OpenAIRE

    Lucido, Vanessa

    2017-01-01

    Dissertação para obtenção do grau de Mestre no Instituto Superior de Ciências da Saúde Egas Moniz O conhecimento da anatomia radicular interna e as suas variações é fundamental para o sucesso do tratamento endodôntico. O primeiro molar superior, e principalmente a sua raiz mesio-vestibular, é um dos dentes que pode apresentar mais variação na sua anatomia interna. O comprimento da raiz mesio-vestibular, no sentido vestíbulo-palatino, e as suas concavidades relacionadas à superfície m...

  11. TEORIA DA DESCOBERTA INEVITÁVEL: QUANDO A ILICITUDE DA PROVA É ÚTIL AO DEVIDO PROCESSO LEGAL.TEORIA DA DESCOBERTA INEVITÁVEL: QUANDO A ILICITUDE DA PROVA É ÚTIL AO DEVIDO PROCESSO LEGAL

    Directory of Open Access Journals (Sweden)

    Alessandra Rapacci Mascarenhas Prado

    2017-06-01

    Full Text Available A Constituição Federal brasileira veda a utilização de provas ilícitas e suas derivadas no processo penal. Enquanto dispositivo do Código de Processo Penal, com base na teoria da descoberta inevitável, permite a valoração de provas ilícita em determinados casos. Questiona-se, portanto, se a vedação pode ser relativizada quando confrontada com a presunção da inocência e direito à liberdade. Assim, o objetivo do trabalho é analisar se, de fato, e em que medida, esta teoria respeita direitos e garantias fundamentais. A metodologia empregada foi a revisão bibliográfica e a pesquisa documental (julgados do Supremo Tribunal Federal.

  12. Quantum effects due to coordinate non-inertial systems; Efeitos quanticos devidos a sistemas nao inerciais de coordenadas

    Energy Technology Data Exchange (ETDEWEB)

    Mueller, Daniel

    1996-12-31

    In chapter 1 we make an introduction to quantum fields in curved spaces, mentioning something about fermions. Chapter 2 begins a brief introduction to General Relativity, and the calculation of the linearized limit to obtain Thirring`s metric, which is a first approximation to the Kerr metric. In Chapter 3 we calculate Dirac`s equation in Thirring`s space-time and work out the non relativistic limit obtaining the modifications in Schroedinger`s equation resulting from the geometry. Particularly, we observe the interference of a particle beam. And in Chapter 4, we present a revision of classical and quantum detectors and discuss the response of detectors in non-inertial motion, in particular, for uniform acceleration and uniform circular motion. The latter is known to yield and integral for the response function which has been so far carried out only numerically. We propose a semi-analytical solution for the spectrum of a circular moving detector. We consider c=1. (author) 27 refs., 4 figs.

  13. ANÁLISE DE FALHAS NO PROCESSO LOGÍSTICO DEVIDO A FALTA DE UM CONTROLE DE QUALIDADE

    Directory of Open Access Journals (Sweden)

    Juliana Barreto

    2005-06-01

    conformidade dos produtos.  A aplicação das Ferramentas da Qualidade Total como o Diagrama de Ishikawa e o Ciclo PDCA  foram possíveis detectar os processos que possuem falhas, permitindo a correção.  Com essas implantações, os resultados se darão em médio prazo, porém as empresas potencializarão seu diferencial competitivo ao entregarem produtos com baixo índice de avarias. Através de comparações entre duas empresas do  ramo moveleiro, foi possível detectar falhas no sistema logístico, para o qual foi sugerida e implantada o Controle de Qualidade, auxiliado pelas ferramentas da Qualidade com o objetivo principal de minimizar os custos decorrentes de danificações de produtos das empresas em estudo.

  14. Characteristic parameters of drift chambers calculation; Calculo de los parametros caracteristicos de camaras de deriva

    Energy Technology Data Exchange (ETDEWEB)

    Duran, I; Martinez-Laso, L

    1989-07-01

    We present here the methods we used to analyse the characteristic parameters of drift chambers. The algorithms to calculate the electric potential in any point for any drift chamber geometry are presented. We include the description of the programs used to calculate the electric field, the drift paths, the drift velocity and the drift time. The results and the errors are discussed. (Author) 7 refs.

  15. Cálculo y dimensionamiento de una camara de refrigeración para mango

    OpenAIRE

    Cueva V., Juan Carlos; Vargas Zúñiga, Ángel

    2009-01-01

    La exportación del mango en el Ecuador tiene alrededor de una década, desde entonces esta fruta tropical se ha convertido en uno de los productos no tradicionales más importantes del Ecuador. En nuestro país existen actualmente alrededor de 9.000 hectáreas sembradas de mango. Debido al manejo optimo que se le ha dado tanto al cultivo como a la exportación, las exportaciones de mango han crecido en un 1.039% en los últimos 5 años. El mango después de cosechado tiene una vida de almacenam...

  16. Blasting forward in underground work; Voladuras de camara de la mina de Aguas Tenidas

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Maneiro, C. H.; Maqueda Jimenez, S.; Pazos Perez, L.; Carnero Ortiz, F.

    2012-11-01

    This paper explains the drilling and blasting techniques of stopes in Aguas Tenidas Mine (Huelva, Spain), including slot raises and slots. Highights are: application of electronic detonators and a 30'' hole in slot raise blasts, ANFO uphole chrging of 89 mm holes and high productive fan drillin, in order to maintain stoping production of 150.000 t/month. (Author)

  17. Fog camera to visualize ionizing charged particles; Camara de niebla para visualizar particulas cargadas ionizantes

    Energy Technology Data Exchange (ETDEWEB)

    Trujillo A, L.; Rodriguez R, N. I.; Vega C, H. R., E-mail: ingtrujilloa@hotmail.com [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Cipres No. 10, Fracc. La Penuela, 98068 Zacatecas (Mexico)

    2014-10-15

    The human being can not perceive the different types of ionizing radiation, natural or artificial, present in the nature, for what appropriate detection systems have been developed according to the sensibility to certain radiation type and certain energy type. The objective of this work was to build a fog camera to visualize the traces, and to identify the trajectories, produced by charged particles with high energy, coming mainly of the cosmic rays. The origin of the cosmic rays comes from the solar radiation generated by solar eruptions where the protons compose most of this radiation. It also comes, of the galactic radiation which is composed mainly of charged particles and gamma rays that comes from outside of the solar system. These radiation types have energy time millions higher that those detected in the earth surface, being more important as the height on the sea level increases. These particles in their interaction produce secondary particles that are detectable by means of this cameras type. The camera operates by means of a saturated atmosphere of alcohol vapor. In the moment in that a charged particle crosses the cold area of the atmosphere, the medium is ionized and the particle acts like a condensation nucleus of the alcohol vapor, leaving a visible trace of its trajectory. The built camera was very stable, allowing the detection in continuous form and the observation of diverse events. (Author)

  18. Uranium deposits obtention for fission chambers; Obtencion de depositos de uranio para fabricacion de camaras de fision

    Energy Technology Data Exchange (ETDEWEB)

    Artacho Saviron, E

    1972-07-01

    The obtention of uranium deposits of the required quality for small cylindrical fission chambers presents some difficulties. With the method of electroplating here described the uniformity, reproducibility and adherence of the obtained deposits were satisfactory. (Author) 6 refs.

  19. Indirect heating of natural gas using vapor chambers; Aquecimento indireto de gas natural com uso de camaras de vapor

    Energy Technology Data Exchange (ETDEWEB)

    Milanez, Fernando H; Mantellil, Marcia H.B.; Borges, Thomaz P.F. [Santa Catarina Univ., Florianopolis, SC (Brazil). Dept. de Engenharia Mecanica; Landa, Henrique G. de [PETROBRAS, Rio de Janeiro, RJ (Brazil). Centro de Pesquisas

    2005-07-01

    Operation safety and reliability are major guidelines in the design of city-gate units. Conventional natural gas heaters operate by a indirect mechanism, where liquid water is used to transfer heat by natural convection between the combustion chamber and the natural gas coil. In this work, the concept of vapor chamber is evaluated as an indirect gas heater. In a vapor chamber, liquid water is in contact with the heat source, and vaporizes. The vapor condenses in contact with the heat sink. A reduced scale model was built and tested in order to compare these two heating concepts where the combustion chamber was replaced by electrical cartridge heaters. This engineering model can operate either as a conventional heater or as a vapor chamber. The comparison between the concepts was done by inducing a controlled power to the cartridges and by measuring the resulting temperature distributions. In the novel design, the heat exchanger efficiency increases, and the thermal inertia decreases, compared to the conventional system. The new sealed concept of the chamber prevents water evaporation losses. (author)

  20. Uncertainty in measurements in practice ionization chamber; Incerteza nas medidas realizadas pela pratica da camara de ionizacao

    Energy Technology Data Exchange (ETDEWEB)

    Sales, Emer; Pinto, Fernando Sandi; Sousa Junior, Samuel Facanha; Freitas, Dayslon Luiz Gaudaret; Andrade, Lucio das Chagas de, E-mail: fernandopintofis@gmail.com [Universidade do Estado do Rio de Janeiro (UERJ), RJ (Brazil)

    2016-07-01

    The calculation of uncertainty is a mathematical tool widely used in the analysis of experimental data, ensuring that the values obtained by measuring equipment are the most accurate and close to the possible real. This paper presents a theoretical review of uncertainty, and with application of objective determination of uncertainty for repeatability and reproducibility of processes measuring for determining dose of a radioactive source, in practice ionization chamber, held at the Professional Master of Medical Physics State University of Rio de Janeiro. (author)

  1. Laboratory implantation for well type ionization chambers calibration; Implantacao de um laboratorio para calibracao de camaras de ionizacao tipo poco

    Energy Technology Data Exchange (ETDEWEB)

    Vianello, E.A.; Dias, D.J.; Almeida, C.E. de [Laboratorio de Ciencias Radiologicas- LCR- DBB (UERJ). R. Sao Francisco Xavier, 524- Pav. HLC, sala 136 terreo- CEP 20.550-013. Rio de Janeiro (Brazil)

    1998-12-31

    The Radiological Science Laboratory is implanting a service for calibration of well type chambers by IAEA training program. The kerma rate in the air (mu Gy/h) of the linear Cs-137 reference source CDCS-J4 have been determined using a well type chamber Standard Imaging HDR-1000 model, which have been calibrated at Secondary Standard Laboratory Calibration of IAEA, whereas two HDR-1000 Plus chambers were calibrated too, following the same standards. The results were compared with Wisconsin University calibration certification and has demonstrated that well type ionization chamber calibration can be used in brachytherapy for several kinds of radionuclides. (Author)

  2. Conditioning of the vacuum chamber of the Tokamak Novillo; Acondicionamiento de la camara de vacio del Tokamak Novillo

    Energy Technology Data Exchange (ETDEWEB)

    Valencia A, R; Lopez C, R; Melendez L, L; Chavez A, E; Colunga S, S; Gaytan G, E

    1992-03-15

    The obtained experimental results of the implementation of two techniques of present time for the conditioning of the internal wall of the chamber of discharges of the Tokamak Novillo are presented, which has been designed, built and put in operation in the Laboratory of Plasma Physics of the National Institute of Nuclear Research (ININ). These techniques are: the vacuum baking and the low energy pulsed discharges, which were applied after having reached an initial pressure of the order of 10{sup -7} Torr. with a system of turbomolecular pumping previous preparation of surfaces and vacuum seals. The analysis of residual gases was carried out with a mass spectrometer before and after conditioning. The obtained results show that the vacuum baking it was of great effectiveness to reduce the value of the initial pressure in short time, in more of a magnitude order and the low energy discharges reduced the oxygen at worthless levels with regard to the initial values. (Author)

  3. Scattering study at free air ionization chamber diaphragm; Estudo do espalhamento no diafragma da camara de ionizacao de ar livre

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Alexandre Lo Bianco dos

    2011-07-01

    The maim of this work consisted in the assessment of the correction factor for air kerma, due to scattered radiation in the diaphragm of the free-air ionization chamber model 481. LNMRl measurements were made to acquire x-ray spectra corresponding to the Qualities RQR-M, described in IEC 61627 standards (2005). These spectra were used as input data in the MC simulations. The operational range of energy spectra provide up to 35 keV. This energy range is typically used in diagnostic radiology, although there is not primary standard for air kerma. The determination of this factor is a fundamental process in the primary standardization of the air kerma. These factors were obtained by computer simulation using the Penelope code. The results are k{sub RQR-M1}=0,9946, k{sub RQR} {sub -M2}=0,9932, k{sub RQR-M3}=0,9978 and k{sub RQR-M4}=0,9885; with uncertainties of 0,007 and coverage factor equal to 2. lt can be concluded that, with respect to the diaphragm, the chamber can be used in the primary standard of air kerma. (author)

  4. Design, construction and testing of a radon experimental chamber; Diseno, construccion y pruebas de una camara experimental de radon

    Energy Technology Data Exchange (ETDEWEB)

    Chavez B, A; Balcazar G, M

    1991-10-15

    To carry out studies on the radon behavior under controlled and stable conditions it was designed and constructed a system that consists of two parts: a container of mineral rich in Uranium and an experimentation chamber with radon united one to the other one by a step valve. The container of uranium mineral approximately contains 800 gr of uranium with a law of 0.28%; the radon gas emanated by the mineral is contained tightly by the container. When the valve opens up the radon gas it spreads to the radon experimental chamber; this contains 3 accesses that allow to install different types of detectors. The versatility of the system is exemplified with two experiments: 1. With the radon experimental chamber and an associated spectroscopic system, the radon and two of its decay products are identified. 2. The design of the system allows to couple the mineral container to other experimental geometries to demonstrate this fact it was coupled and proved a new automatic exchanger system of passive detectors of radon. The results of the new automatic exchanger system when it leave to flow the radon freely among the container and the automatic exchanger through a plastic membrane of 15 m. are shown. (Author)

  5. Desmoplastic ameloblastoma mimicking a periapical lesion = Ameloblastoma desmoplásico mimetizando lesão periapical

    Directory of Open Access Journals (Sweden)

    Santos, Esaú Pinheiro dos

    2010-01-01

    Full Text Available Ameloblastoma desmoplásico (AD é uma rara variante do ameloblastoma, com características clínicas, imaginológicas e histopatológicas específicas. O perfil biológico deste tumor não é totalmente compreendido, devido ao número limitado de casos notificados. O objetivo deste trabalho é relatar um caso de AD simulando uma lesão periapical. Este tumor apareceu na região anterior da maxila esquerda numa paciente do gênero feminino de 24 anos de idade, entre o incisivo lateral esquerdo e o canino. A lesão era indolor e apresentava apenas um ligeiro inchaço da mucosa do palato duro. Radiograficamente, uma área radiolúcida bem delimitada que promovia a divergência radicular foi observada. O incisivo lateral respondeu negativamente aos testes pulpares. Diagnóstico provisório de cisto radicular versus cisto fissural foi estabelecido e enucleação cirúrgica seguida de curetagem foi realizada. O exame histológico das amostras revelou a proliferação dos ninhos e cordões de epitélio odontogênico comprimido imersos em um estroma densamente colagenizado, associada a um trabeculado ósseo levemente irregular. Estas características eram consistentes com AD. A necrose pulpar do incisivo e o aparecimento radiográfico atípico, deixava a doença em absconso. Apesar das altas taxas de recorrência, nenhum sinal clínico ou radiográfico de recidiva do tumor foi detectado um ano mais tarde

  6. SEM - Morphological evaluation of the root apex in human primary teeth with different degrees of pulpal and periapical pathology

    OpenAIRE

    Patrícia Motta Fernandes

    2007-01-01

    O objetivo deste estudo foi avaliar a morfologia da superfície externa de ápices radiculares de dentes decíduos de humanos com necrose pulpar, com e sem lesão periapical visível radiograficamente, e de dentes com vitalidade pulpar, por meio da microscopia eletrônica de varredura (MEV). Dezenove dentes foram extraídos sendo cinco dentes com vitalidade pulpar (Grupo I), seis com necrose pulpar sem lesão periapical (Grupo II) e oito com necrose pulpar e lesão periapical (Grupo III). Os dentes (i...

  7. Environmental pollutants and stroke-related hospital admissions Poluentes ambientais e internações devido a acidente vasculoencéfalico

    Directory of Open Access Journals (Sweden)

    Luiz Fernando Costa Nascimento

    2012-07-01

    Full Text Available Some effects of environmental pollution on human health are known, especially those affecting the respiratory and cardiovascular systems. The current study aimed to estimate these effects on the production of hospital admissions for stroke. This was an ecological study using hospital admissions data in São José dos Campos, São Paulo State, Brazil, with diagnosis of stroke, from January 1, 2007, to April 30, 2008. The target pollutants were particulate matter, sulfur dioxide, and ozone. Use of a Poisson linear regression model showed that same-day exposure to particulate matter was associated with hospitalization for stroke (RR = 1.013; 95%CI: 1.001-1.025. An increase of 10µg/m³ in this pollutant increased the risk of hospitalization by 12% (RR = 1.137; 95%CI: 1.014-1.276. In the multi-pollutant model, it was thus possible to identify particulate matter as associated with hospitalization for stroke in a medium-sized city like São José dos Campos.Alguns dos efeitos da poluição ambiental na saúde humana são conhecidos, destacando aqueles nos sistemas respiratório e cardiovascular. Este trabalho tem por objetivo estimar esses efeitos na gênese das internações por acidente vasculoencefálico. Foi um estudo ecológico realizado com dados de internações da cidade de São José dos Campos, São Paulo, Brasil, relativos aos diagnósticos de acidente vascular cerebral, entre 1º de janeiro de 2007 e 30 de abril de 2008. Os poluentes estudados foram material particulado, dióxido de enxofre e ozônio. Utilizando-se de modelo linear generalizado da regressão de Poisson, foi possível identificar exposição ao material particulado, no mesmo dia, como associado à internação por acidente vasculoencefálico (RR = 1,013; IC95%: 1,001-1,025. O aumento de 10µg/m3 desse poluente aumenta o risco de internação em 12% (RR = 1,137; IC95%: 1,014-1,276. Assim, foi possível identificar o material particulado, no modelo multipoluente, como associado à internação por acidente vasculoencefálico numa cidade de porte médio, como São José dos Campos.

  8. Epidemiology of cancer due to radiations and development of guidelines; Epidemiologia do cancer devido a radiacoes e a elaboracao de recomendacoes

    Energy Technology Data Exchange (ETDEWEB)

    Okuno, Emico [Universidade de Sao Paulo (USP), SP (Brazil). Inst. de Fisica. Dept. de Fisica Nuclear], E-mail: emico.okuno@dfn.if.usp.br

    2009-10-15

    This review article describes the ionizing and non-ionizing radiation protection commissions and the development processes of the guidelines for limiting exposure to these radiations. We briefly describe the history of these commissions and the types of epidemiological studies from which the risk factors are evaluated. Some recent results obtained from epidemiological studies of atomic bomb survivors in Japan and the inherent difficulties will be presented. At last the current international recommendations will be presented. (author)

  9. Colaboração unilateral premiada como consectário lógico das balizas constitucionais do devido processo legal brasileiro

    OpenAIRE

    Santos, Marcos Paulo Dutra

    2017-01-01

    O artigo objetiva assentar a possibilidade da colaboração premiada unilateral, independentemente de acordo prévio com o Ministério Público. A partir do contraponto entre os modelos norte-americano e italiano de justiça penal negocial e o praticado no Brasil, demonstrar-se-á que a aceitação dessa modalidade de cooperação, considerada a natureza dos benefícios previstos em lei, é decorrência natural e inafastável dos princípios constitucionais informativos do ordenamento processual penal brasil...

  10. Occupational doses due to photoneutrons in medical linear accelerators rooms; Doses ocupacionais devido a neutrons em salas de aceleradores lineares de uso medico

    Energy Technology Data Exchange (ETDEWEB)

    Soares, Alessandro Facure Neves de Salles

    2006-04-15

    Medical linear accelerators, with maximum photon energies above 10 MeV, are becoming of common use in Brazil. Although desirable in the therapeutic point of view, the increase in photon energies causes the generation of undesired neutrons, which are produced through nuclear reactions between photons and the high Z target nuclei of the materials that constitute the accelerator head. In this work, MCNP simulation was undertaken to examine the neutron equivalent doses around the accelerators head and at the entrance of medical linear accelerators treatment rooms, some of them licensed in Brazil by the National Regulatory Agency (CNEN). The simulated neutron dose equivalents varied between 2 e 26 {mu} Sv/Gy{sub RX}, and the results were compared with calculations performed with the use of some semi-empirical equations found in literature. It was found that the semi-empirical equations underestimate the simulated neutron doses in the majority of the cases, if compared to the simulated values, suggesting that these equations must be revised, due to the increasing number of high energy machines in the country. (author)

  11. Resonance analysis of the transformers winding owing of system transients; Analise de ressonancia de parte de enrolamentos de transformadores devido a transitorio no sistema

    Energy Technology Data Exchange (ETDEWEB)

    Alves, M F; Ribeiro, E E [MF Consultoria Ltda (Brazil); Aguiar Campos, W de [Companhia Energetica de Minas Gerais (CEMIG), Belo Horizonte, MG (Brazil)

    1992-12-31

    An analysis of the damage on power transformer winding during occurrence of electrical transients in substations, its causes and an analysis of its occurrence situations are presented. Results of studies in the substation Ouro Preto 2, made by CEMIG (Companhia Energetica de Minas Gerais) aiming an analysis of the possibility to occur damage in transformers winding are also reported 6 refs., 8 figs., 1 tab.

  12. Investigação de perdas devido ao trabalho inacabado e o seu impacto no tempo de ciclo dos processos construtivos

    Directory of Open Access Journals (Sweden)

    Paulo Ricardo Ramos Santos

    Full Text Available Resumo As perdas na construção civil constituem um entrave à melhoria da produtividade. Dentre os diversos tipos de perdas, o making-do se destaca por representar uma fonte de outras perdas. Fireman et al. (2013, ao estudarem o making-do, concluíram que ele pode ser desencadeado por um tipo de perda geral, denominada de trabalho inacabado. O objetivo do presente trabalho foi investigar a ocorrência do trabalho inacabado nos processos construtivos e o seu impacto no tempo de ciclo dos serviços. A pesquisa foi de um levantamento de campo em cinco canteiros, envolvendo observação direta. Utilizou-se como ferramentas de pesquisa: formulário, questionários e checklist, adaptados da literatura para identificação e classificação do trabalho inacabado, bem como aferição do seu impacto no tempo de ciclo. Houve também entrevistas não estruturadas com os gerentes de obras, mestres e encarregados. Os resultados mostraram que as falhas no sequenciamento das tarefas associadas com falhas na gestão da qualidade serviram de desencadeadores para o trabalho inacabado. Notou-se que os canteiros que apresentaram planos de curto prazo formalizados atenuaram os impactos desse tipo de perda. Na maioria das obras o tempo de ciclo previsto não foi cumprido, observando-se que aquelas que tinham equipe administrativa mais encorpada obtiveram acréscimo de tempo menor.

  13. Absorbed dose due to radioiodine therapy by organs of patients with hyperthyroidism; Dose absorvida em orgaos de pacientes com hipertiroidismo devido a radioiodoterapia

    Energy Technology Data Exchange (ETDEWEB)

    Lima, F.F.; Khoury, H.J.; Bertelli Neto, L. [Pernambuco Univ., Recife, PE (Brazil); Laboratorios CERPE, Recife, PE (Brazil); Bertelli Neto, L. [Instituto de Radioprotecao e Dosimetria (IRD), Rio de Janeiro, RJ (Brazil)

    1999-07-01

    The dose absorbed by organs of patients with hyperthyroidism treated with {sup 131} I was estimated by using the MIRDOSE computer program and data from ICRP-53. The calculation were performed using effective half-life and uptake average values, which were determined for 17 patients treated with 370 MBq and 555MBq of {sup 131} I. The results shown that the dose in the thyroid, for a 370 MBq administrated activity, was of 99 Gy and 49.5 Gy for 60 g and 80 g thyroid respectively. The average dose estimated in other organs were relatively low, presenting values lower than 0.1 Gy in the kidneys, bone marrow and ovaries and 0.19 Gy in the stomach.

  14. Método para determinar a energia descartada por tratamento inadequado de uma família de produtos devido à obsolescência programada

    OpenAIRE

    Ordoñez Duran, Julian Fernando

    2014-01-01

    Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Mecânica, Florianópolis, 2014. A obsolescência programada é um conceito que se popularizou depois da segunda guerra mundial, quando as empresas de manufatura tinham terminado de reconstruir os lares destruídos durante a guerra. As fábricas estavam prontas para vender, mas os níveis de vendas estavam diminuindo cada vez mais. A resposta dos economistas foi à diminuiçã...

  15. CO{sub 2} emissions due to the air transportation in Brazil; Emissoes de CO{sub 2} devido ao transporte aereo no Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Simoes, Andre Felipe; Schaeffer, Roberto [Universidade Federal, Rio de Janeiro, RJ (Brazil). Coordenacao dos Programas de Pos-graduacao de Engenharia. Programa de Planejamento Energetico]. E-mail: afsimoes@antares.com.br; roberto@ppe.ufrj.br

    2002-07-01

    This work intends to to insert and understand the participation of the brazilian air transportation in the ambit of the global climate changes. Firstly an introduction is presented for positioning the Brazil, in the proposed subject; an approach of the tenuous relationship between the air transportation sector and atmospheric environment medium; the energy consumption associated to the growing demand; and the inventory of the CO{sub 2} emissions (Calculated by using the top-down methodology) due to the Brazilian air transportation activities. The work is globally discussed and analysed.

  16. Uso do metronidazol como medicação intracanal em dentes com necrose pulpar e reação periapical: relato de caso = The use of metronidazol as an intracanal medication for teeth with pulpar necrosis and periapical reaction: case report

    Directory of Open Access Journals (Sweden)

    Carneiro, Sérgio Murilo Barbalho de Souza

    2005-01-01

    Full Text Available O objetivo desse trabalho foi comparar dois tratamentos endodônticos realizados em dentes com abscesso periapical crônico, em um mesmo paciente, empregando-se medicações intracanais diferentes. Para isso foram relatados dois casos clínicos de tratamentos endodônticos em dois dentes (31 e 41, nos quais foram empregados a mesma técnica de preparo biomecânico e obturação, variando apenas a medicação intracanal, pois no dente 31 foi empregada uma pasta a base de hidróxido de cálcio (Calen e no dente 41, o metronidazol na forma de gel ginecológico. Após um ano de proservação dos tratamentos realizados, verificou-se reparação dos tecidos periapicais em ambos os dentes, concluindo-se que, nesse caso, a variação da medicação intracanal não interferiu no resultado do tratamento instituído e que o metronidazol pode ser uma alternativa viável como coadjuvante na terapia endodôntica desse tipo de patologia

  17. C:\\Users\\AISA\\Desktop\\A. B. FANDOHAN.xps

    African Journals Online (AJOL)

    AISA

    Lantana camara (verbenaceae) : a potential threat to the effectiveness of ... network was highly suitable for L. camara under current climate. ..... in their historical home range but also because ... environmentally friendly biocontrol protocols.

  18. Effects of holmium laser on dental structure in vivo: thermal evaluation and histological analysis on pulpal tissue; Efeitos in vivo do laser de holmio em estrutura dental: monitoracao termica e analise histologica do tecido pulpar

    Energy Technology Data Exchange (ETDEWEB)

    Strefezza, Claudia

    2001-07-01

    Previous in vitro studies have demonstrated that Ho:YLF laser is capable of inducing physical and chemical changes on dental surfaces treated for caries prevention. The temperature in the pulp chamber was in vitro evaluated to as a function of the power and frequency of the laser irradiation. The purpose of this work is to verify the occurrence of pulp inflammation after Ho:YLF laser irradiation using different parameters in rabbits' teeth. The premolars and molars of ten rabbits (NZB) were divided in two groups according to the irradiation energy values of a Ho:YLF laser prototype operating at 2.065{mu}m wave length, frequency of O,5Hz and pulse length of 250{mu}s. An group A teeth were irradiated with using ten pulses of 334mJ/pulse of a Ho:YLF laser prototype operating at O.5Hz, and group B, with 512mJ/pulse. Animals were killed by transcardiac perfusion and the samples were prepared for histopathological analysis. The in vitro temperature monitoring revealed an increase of 1 deg C for the 334mJ/pulse energy and 4.5 deg C for the 512mJ/pulse energy. SEM observations showed the occurrence of melting and resolidification in dental surface. From the in vivo analysis it can be concluded that both employed laser parameters did not induce to any inflammatory response from the pulp. (author)

  19. Histopathological study of the effects of low-intensity laser irradiation ({lambda}=650 nm) on dental pulp tissue after cavity preparation; Estudo histopatologico dos efeitos da irradiacao laser em baixa intensidade ({lambda}=650nm) em tecido pulpar apos preparo cavitario

    Energy Technology Data Exchange (ETDEWEB)

    Bertella, Claudio

    2001-07-01

    The purpose of this study was to evaluate (in vivo) the effects of low-intensity Arsenide Gallium Aluminium laser application post-cavity preparation class 1. Six patients with bilateral pre-molars and molars indicated to extraction for orthodontics aim were selected. Four samples of these teeth underwent cavity preparation with deep from medium to high and two samples underwent cavity preparation from high to pulp expositions. The samples were constituted of two teeth of the same patient and received different treatments. One of the teeth underwent laser exposition and the other one was maintained as control, before restorative procedure with polycarboxylate cement. A diode laser ({lambda}=650 nm), output power 30 mW and fluencies of 1,8 J/cm{sup 2} and 2,7 J/cm{sup 2} in pre-molars and molars, respectively, was used for irradiation with repetition rate of 18 Hz in interrupted continuous wave mode. After seven days, the teeth were extracted and processed histologically with HE to verify morphological changes in the pulpy tissue. The four samples, which cavity preparation and restorative material were not in contact with the pulp, did not show histological differences between irradiated and non-irradiated teeth. Both of them presented the same characteristics of normality. The two samples with exposed pulpy tissue showed different results. The irradiated teeth presented no or slight inflammatory signs when compared to the control samples, which showed abscess in the coronary pulp interior and intense inflammatory infiltrated. These results suggest that the laser irradiation can be used as a therapeutic modality in clinical trials, in the conditions employed in this study. (author)

  20. Análise microscópica da polpa dental de cães após pulpotomia e proteção pulpar com agregado de trióxido mineral e cimento Portland branco

    OpenAIRE

    Menezes, Renato; Bramante, Clóvis Monteiro; Garcia, Roberto Brandão; Letra, Ariadne; Carvalho, Vanessa Graciela Gomes; Carneiro, Everdan; Brunini, Sérgio; Oliveira, Rodrigo Cardoso; Canova, Giovana Calichio; Moraes, Fernanda Gomes de

    2004-01-01

    Considering previous studies on the similarity between the chemical composition of the mineral trioxide aggregate and the Portland cement, the purpose of this study was to investigate the pulp response of dog's teeth after pulpotomy and direct pulp protection with MTA Angelus and white Portland cement. Thirty eight pulp remnants were protected with these materials. One hundred and twenty days after treatment, the animals were sacrificed and the specimens removed and prepared for histological ...

  1. Effect of the addition of collagen in the preparation of hydroxyapatite, aiming the application of pulp capping; Efeito da adicao de colageno na preparacao de hidroxiapatita visando a aplicacao como capeador pulpar

    Energy Technology Data Exchange (ETDEWEB)

    Ribeiro, Geysy L.; Mendes, Luis C., E-mail: geysylopes@ima.ufrj.br [Instituto de Macromoleculas Professora Eloisa Mano (IMA) - Universidade Federal do Rio de Janeiro, UFRJ. Centro de Tecnologia, RJ (Brazil)

    2011-07-01

    This work studied the action of collagen (COLL) in the hydroxyapatite (HA) synthesis, produced through sol-gel process, in order to mimetize the chemical composition of dental tissue. The resulting material was characterized by energy dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FT-IR), wide-angle X-ray diffraction (WAXD) and scanning electron microscopy (SEM). The Ca/P ratio was determined through EDX - 1,89 e 2,38, with and without collagen, respectively. The FT-IR analysis showed no significant interaction between the constituents of the composite. The R-ray diffractograms indicated an increase of the resolution and intensity of the HA peak. The photomicrographies showed that the preparation method exhibited significantly influence onto the hydroxyapatite morphology, as well as resulted in a homogeneously dispersed composite. (author)

  2. The effect of timing temporary cements to treat induced pulp necrosis in the teeth of dogs Uso do "curativo de demora" em diferentes tempos no tratamento endodôntico de cães com necrose pulpar induzida

    Directory of Open Access Journals (Sweden)

    Léslie M. Domingues-Falqueiro

    2007-02-01

    Full Text Available During endodontic therapy (pulpectomy, root canal debridement and root canal filling microbiological management is a major concern. Bacteria present in dentine tubules, apical foramina and apical delta are causally related to failure of the procedure. Studies have shown that during single session endodontic treatment bacteria remain within dental structures. The aim of the present study was to evaluate endodontic treatment performed as two sessions, using temporary endodontic dressing materials for different periods in four groups of experimental dogs. A total of 80 roots of second and third upper premolar teeth and second, third and fourth lower premolar teeth were divided into four groups. The pulp chamber was opened with burrs and the pulp exposed for 60 days to induce pulpal inflammation and necrosis. Groups II, III and IV were treated with calcium hydroxide plus camphorated paramono-chlorophenol (PMCC for 7, 15 and 30 days, respectively. In all groups, the root canals were filled with zinc oxide-eugenol and gutta-percha cones. Clinical and radiographical measurements were performed every 2 weeks. After 60 days a small block section containing the teeth, surrounding periapical tissues and the periodontium was removed for histological and microbiological study. Histological analysis revealed intense inflammatory response in all groups. Microbiological analysis showed microbial reduction inversely proportional to the period of time that the intracanal temporary medicament was left in place.Em um tratamento endodôntico, a microbiota é o ponto primordial a ser levado em consideração, pois as bactérias presentes nos túbulos dentinários, nas foraminas e no delta apical em cães estão relacionadas aos insucessos do procedimento. Estudos revelam que tratamentos realizados em uma única sessão ainda permitem a permanência de bactérias nas estruturas dentárias, portanto propõe-se a execução em duas sessões, com diferentes tempos de "curativo de demora", para verificação da eficácia do protocolo em cães. Foram utilizados no total quatro cães, num total de 80 raízes, provenientes dos 2os e 3os pré-molares superiores e 2os, 3os e 4os pré-molares inferiores, divididas em quatro grupos de estudo. Nestes foi realizada abertura coronária, onde a polpa ficou exposta por 60 dias. Os Grupos II, III e IV foram tratados. O hidróxido de cálcio com p-monoclorofenol canforado, isto é, a pasta Calen/PMCC (S.S. White Artigos Dentários Ltda, RJ, foi utilizada como "curativo de demora". O Grupo II permaneceu com "curativo de demora" por sete dias, o Grupo III permaneceu por 15 dias e o Grupo IV por 30 dias, todos os grupos foram obturados com cimento à base de óxido de zinco e eugenol - Herodent (Vigodent S.A. Indústria e Comércio, SP e guta-percha. Todos os grupos tiveram controle clínico e radiográfico quinzenal e após 60 dias os dentes foram extraídos em bloco (dente e periodonto e passaram por processamento laboratorial para realização das análises histopatológica e histomicrobiológica. A análise histopatológica de forma geral mostrou intensa reação inflamatória em todos os grupos estudados, já na análise histomicrobiológica pode-se observar uma diminuição no número de microrganismos proporcional ao tempo de "curativo de demora" deixado intra-canal, portanto a permanência do "curativo" por 30 dias foi a mais eficaz.

  3. GUÍA DE DIAGNÓSTICO CLÍNICO PARA PATOLOGÍAS PULPARES Y PERIAPICALES. VERSIÓN ADAPTADA Y ACTUALIZADA DEL "CONSENSUS CONFERENCE RECOMMENDED DIAGNOSTIC TERMINOLOGY", PUBLICADO POR LA ASOCIACIÓN AMERICANA DE ENDODONCIA (2009)

    OpenAIRE

    Marroquín Peñaloza, Talía Y; García Guerrero, Claudia C

    2015-01-01

    INTRODUCCIÓN:el correcto diagnóstico en endodoncia permite la selección de un tratamiento endodóntico adecuado. Los términos utilizados para la nominación de cada patología, deben asociarse a las condiciones clínicas particulares. La unificación de la terminología diagnóstica en endodoncia ha sido un tema ampliamente discutido en el ámbito clínico y académico. El objetivo de esta investigación fue desarrollar la adaptación y actualización de la Guía de diagnóstico clínico, para patologías pul...

  4. Effects of holmium laser on dental structure in vivo: thermal evaluation and histological analysis on pulpal tissue; Efeitos in vivo do laser de holmio em estrutura dental: monitoracao termica e analise histologica do tecido pulpar

    Energy Technology Data Exchange (ETDEWEB)

    Strefezza, Claudia

    2001-07-01

    Previous in vitro studies have demonstrated that Ho:YLF laser is capable of inducing physical and chemical changes on dental surfaces treated for caries prevention. The temperature in the pulp chamber was in vitro evaluated to as a function of the power and frequency of the laser irradiation. The purpose of this work is to verify the occurrence of pulp inflammation after Ho:YLF laser irradiation using different parameters in rabbits' teeth. The premolars and molars of ten rabbits (NZB) were divided in two groups according to the irradiation energy values of a Ho:YLF laser prototype operating at 2.065{mu}m wave length, frequency of O,5Hz and pulse length of 250{mu}s. An group A teeth were irradiated with using ten pulses of 334mJ/pulse of a Ho:YLF laser prototype operating at O.5Hz, and group B, with 512mJ/pulse. Animals were killed by transcardiac perfusion and the samples were prepared for histopathological analysis. The in vitro temperature monitoring revealed an increase of 1 deg C for the 334mJ/pulse energy and 4.5 deg C for the 512mJ/pulse energy. SEM observations showed the occurrence of melting and resolidification in dental surface. From the in vivo analysis it can be concluded that both employed laser parameters did not induce to any inflammatory response from the pulp. (author)

  5. The uncertainty associated to the position of the ionization chamber; La incertidumbre asociada en el posicionamiento de la camara de ionizacion

    Energy Technology Data Exchange (ETDEWEB)

    Lopez, F., E-mail: flopez@unan.edu.ni [Universidad Nacional Autonoma de Nicaragua, Managua (Nicaragua); Cabral, T.S.; Peixoto, J.G. [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil)

    2013-07-01

    This work is about the determination of the components of uncertainties originated for the positioning of 600cm{sup 3} camera in a field of radiation for a {sup 137}Cs source for a Dosimetry Laboratories. The basic idea is the inverse square of the distance law and its influence on the kerma in air. It was demonstrated that the effect over the uncertainty is negligible, for a 30 cm{sup 3} camera the result will be different. (author)

  6. Interface for the Construction of the CMS Detector (IC''3MS); Interfaz para la Construccion de Camaras CMS (IC''3MS)

    Energy Technology Data Exchange (ETDEWEB)

    Ballador Ferreras, A.; Gonzalez Giralda, C. [Ciemat. Madrid (Spain)

    2001-07-01

    This Technical Report shows a computer System named: Interface for the Control of CMS Detector (IC''3MS), whose main objective is to provide a design and advice tool which can be used for the assembly of super layers for the Compacts Muon Solenoid. This computer application is divided up into three independent modules that maintain a proper connection between them. These modules correspond to the three principal actors that control the assembly we said before. These actors are the analysts, that determine the control routines, the engineers, that specify the control details and finally the workers who use the control routines. This application has been developed as a collaboration between the Experimental Physic of Particles; which belongs to the Fusion and Elementary particles department and the Special Project Group, belonging to the Information Technologies Department, both them from the CIEMAT (Author)

  7. Characterization of a extrapolation chamber in standard X-ray beam, radiodiagnosis level; Caracterizacao de uma camara de extrapolacao em feixes padroes de raios X, nivel radiodiagnostico

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Eric A.B. da; Caldas, Linda V.E., E-mail: ebrito@usp.b [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2011-10-26

    The extrapolation chamber is a ionization chamber used for detection low energy radiation and can be used as an standard instrument for beta radiation beams. This type of ionization chamber have as main characteristic the variation of sensible volume. This paper performs a study of characterization of a PTW commercial extrapolation chamber, in the energy interval of the qualities of conventional radiodiagnostic

  8. Influence of the combustion chamber during the transient performance of gas turbines; Influencias da camara de combustao durante o transitorio de turbinas a gas

    Energy Technology Data Exchange (ETDEWEB)

    Cunha Alves, M.A. da [Centro Tecnico Aeroespacial, Sao Jose dos Campos, SP (Brazil). Inst. de Pesquisas e Desenvolvimento

    1991-12-31

    It has been realised that heat transfer and others secondary effects have an important influence on the transient performance of a gas turbine, but until very recently, modelling was carried out either assuming adiabatic conditions, or using expedient but unrealistic models to simulate these effects. This work describes the effects of combustion chamber heat storage and of dead time lag of the combustion process, during a gas turbine transient. These effects have been investigated and the analysis has indicated that these effects do not play an important role in the transient performance of the engine analysed, but in certain circumstances they may become important. (author). 5 refs., 4 figs.

  9. Study of the Dependence of the Source check ionization chamber with pressure; Estudio de la dependencia de la camara de ionizacion Sourcecheck con la presion

    Energy Technology Data Exchange (ETDEWEB)

    Tornero-Lopez, A. M.; Ruiz-Arrabola, S.; Moreno-Torres, M.; Simancas, F.; Guerrero, R.; Guirado, D.

    2013-07-01

    Because of the importance of accurate measurement of power low-energy photons, such as I-125 seeds used in brachytherapy, and the widespread use of Source Check in Europe, this work is to study whether this camera features any dependence the pressure and shows included in the pressure-temperature factor usual. (Author)

  10. Dosimetry in VMAT for prostate using ionization chambers of different volumes; Verificacao dosimetrica em VMAT para prostata com camaras de ionizacao de volumes diferentes

    Energy Technology Data Exchange (ETDEWEB)

    Groppo, Daniela P.; Anderson, Ernani; Pavan, Guilherme A., E-mail: danielagroppo@grupocoi.com, E-mail: ernanianderson@grupocoi.com [Clinicas Oncologicas Integradas (Grupo COI), Rio de Janeiro, RJ (Brazil); Caldas, Linda V.E., E-mail: lcaldas@ipen.br [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2016-07-01

    The volumetric modulated arc therapy is one of the most modern radiotherapy techniques. The advents of this modality in the dose delivery can also contribute to errors during the execution of the treatment, therefore various types of quality control are carried out. The individual assessment of dose delivered to the patient is also an important quality control test and required by the current regulations. The objective of this study was to evaluate the use of different volume ionization chambers for dosimetry of VMAT treatments for prostate cancer. Three ionization chambers were evaluated and all of them showed satisfactory results. (author)

  11. Design of a chamber for deposit of thin films by laser ablation; Diseno de una camara para el deposito de peliculas delgadas por ablacion laser

    Energy Technology Data Exchange (ETDEWEB)

    Chirino O, S

    2001-07-01

    The present work has as purpose to design a vacuum chamber, to the one that is denominated chamber of ablation, in which were carried out deposits of thin films using the well-known technique as laser ablation. To fulfill the purpose, the work has been distributed in the following way: in the chapter 1 there are discussed the generalities of the technique of ablation laser for the obtaining of materials in form of thin film, in the chapter 2 the basic concepts of the vacuum technology are mentioned that includes among other things, systems to produce vacuum and vacuum gages and in the chapter 3 the design of the chamber is presented with the accessories and specific systems. (Author)

  12. Analysis of the microturbine combustion chamber by using the CHEMKIN III computer code; Analise da camara de combustao de microturbinas empregando-se o codigo computacional CHEMKIN III

    Energy Technology Data Exchange (ETDEWEB)

    Madela, Vinicius Zacarias; Pauliny, Luis F. de A.; Veras, Carlos A. Gurgel [Brasilia Univ., DF (Brazil). Dept. de Engenharia Mecanica]. E-mail: gurgel@enm.unb.br; Costa, Fernando de S. [Instituto Nacional de Pesquisas Espaciais (INPE), Sao Jose dos Campos, SP (Brazil). Lab. Associado de Combustao e Propulsao]. E-mail: fernando@cptec.inpe.br

    2000-07-01

    This work presents the results obtained with the simulation of multi fuel micro turbines combustion chambers. In particular, the predictions for the methane and Diesel burning are presented. The appropriate routines of the CHEMKIN III computer code were used.

  13. Calibration methods of plane-parallel ionization chambers used in electron dosimetry; Metodos de calibracao de camaras de ionizacao de placas paralelas para dosimetria de feixes de eletrons

    Energy Technology Data Exchange (ETDEWEB)

    Bulla, Roseli Tadeu

    1999-07-01

    The use of linear accelerators in radiotherapy is of great importance in Medicine, and according to international recommendations the electron beam dosimetry has to be performed using plane-parallel ionization chambers, previously calibrated in standard gamma radiation fields at accredited laboratories. In this work, calibration methods of plane-parallel ionization chambers used in dosimetry procedures of high energy electron beams of clinical accelerators were presented, tested and intercompared. The experiments were carried out using gamma radiation beams of {sup 60} Co at the Calibration Laboratory of Clinical Dosemeters at IPEN and electron beams od 4 to 16 MeV at the Radiotherapy Department of Hospital Israelita Albert Einstein, Sao Paulo. A method was chosen to be established at IPEN. Proposals of the calibration procedure, calibration certificate and data sheets are presented. (author)

  14. Design and implementation of a quality assurance program for gamma cameras; Diseno e implementacion de un programa de aseguramiento de calidad para camaras gamma

    Energy Technology Data Exchange (ETDEWEB)

    Montoya M, A.; Rodriguez L, A. [Instituto Nacional de Cancerologia, Departamento de Medicina Nuclear, Av. San Fernando No. 22, Col. Seccion XVI, 14080 Mexico D. F. (Mexico); Trujillo Z, F. E., E-mail: montoya-moreno@hotmail.co [Hospital Regional de Alta Especialidad de Oaxaca, Area de Fisica Medica, Aldama s/n, Paraje El Tule, 71256 San Bartolo Coyotepec, Oaxaca (Mexico)

    2010-09-15

    In nuclear medicine more than 90% of the carried out procedures are diagnostic. To assure an appropriate diagnostic quality of the images and the doses optimization received by the patients originated in the radioactive material, it is indispensable the periodic surveillance of the operation and performance of the equipment s by means of quality assurance tests. This work presents a proposal of a quality assurance program for gamma cameras based on recommendations of the IAEA, the American Association of Medical Physics and the National Electrical Manufacturers Association. Some tests of the program were applied to an e.cam gamma camera (Siemens) of the Nuclear Medicine Department of the National Institute of Cancer. The intrinsic and extrinsic uniformity, the intrinsic spatial resolution and the extrinsic sensibility were verified. For intrinsic uniformity the average daily values of the integral uniformity and differential uniformity in the useful vision field were 2.61% and 1.58% respectively, the average monthly values of intrinsic uniformity for the integral and differential uniformity in the useful vision field were 4.10% and 1.66% respectively. The used acceptance criterions were respectively of 3.74% and 2.74%. The average values of extrinsic uniformity for the useful vision field were of 7.65% (intrinsic uniformity) and 2.69% (extrinsic uniformity), in this case the acceptance criterion is a value of 6.00%. The average value of intrinsic spatial resolution went 4.67 mm superior to 4.4. mm that is the acceptance limit. Finally, maximum variations of 1.8% were observed (minors than 2% that is the acceptance criterion) for the extrinsic sensibility measured in different regions of the detector. Significant variations of extrinsic sensibility were not observed among the monthly lectures. Of the realized measurements was concluded that the system requires of a maintenance service by part of the manufacturer, which one carries out later on to this work. The implementation of a quality assurance program in nuclear medicine allows obtain diagnostic images of excellent quality, the doses optimization imparted to the patients, an exposition decrease to the occupationally exposed personnel, and in general it allows to improve the service productivity. This proposal can be used to develop similar quality assurance programs in other facilities also it can to act like an antecedent for the normative proposal for the quality assurance of equipment s in nuclear medicine. (Author)

  15. Proofs of acceptance of ionization cameras for use in radiotherapy; Pruebas de aceptacion de camaras de ionizacion de uso en radioterapia

    Energy Technology Data Exchange (ETDEWEB)

    Davila, Hernan Olaya; Flores, Guillermo, E-mail: holayadavila@gmail.com [Instituto Colombiano de Geologia y Mineria (INGEOMINAS), Bogota, D.C. (Colombia). Laboratorio de Metrologia de las Radiaciones del Servicio Geologico Colombiano; Cantillo, Juliana I.P., E-mail: julianacantillo5@gmail.com [Universidad Pedagogica y Tecnologica de Colombia, Boyaca (Colombia)

    2013-07-01

    Shows the main technical tests released in the Secondary Standard Dosimetry Laboratory (SSDL) of one cylindrical ionization chamber and another plane parallel ionization chamber similar to used in radiotherapy services in Colombia to the radiation dose control that is delivered to the patient to the cancer treatment. The previous test of one calibration see in this work are: correction for recombination losses, polarity dependence, stabilization time, total dose dependence, atmospheric communication, stability check, leakage current and physical integrity. Calculates the acceptability values in the SSDL to be account as reference for the dosimetry systems that are carry in calibration process. (author)

  16. Study on a drift chamber for high energy experiments; Estudos sobre uma camara de arrasto para um experimento de altas energias

    Energy Technology Data Exchange (ETDEWEB)

    Puget, Maria Augusta Constante

    1993-12-31

    This work deals with the studies of a multiwire gaseous detector operating as a drift chamber, which will be part of the SELEX spectrometer of the experiment Fermilab E781. A prototype was designed to be built and tested at IFUSP. Results are shown of the analysis of data taken with another similar detector whose construction and test were done at Fermilab, with the aim of studying its characterization and performance. (author) 35 refs., 54 figs., 17 tabs.

  17. Study on a drift chamber for high energy experiments; Estudos sobre uma camara de arrasto para um experimento de altas energias

    Energy Technology Data Exchange (ETDEWEB)

    Puget, Maria Augusta Constante

    1994-12-31

    This work deals with the studies of a multiwire gaseous detector operating as a drift chamber, which will be part of the SELEX spectrometer of the experiment Fermilab E781. A prototype was designed to be built and tested at IFUSP. Results are shown of the analysis of data taken with another similar detector whose construction and test were done at Fermilab, with the aim of studying its characterization and performance. (author) 35 refs., 54 figs., 17 tabs.

  18. Hydra phantom applicability for carrying out tests of field uniformity in gamma cameras; Aplicabilidade do fantoma hydra para realizacao dos testes de uniformidade de campo em gama camaras

    Energy Technology Data Exchange (ETDEWEB)

    Aragao Filho, Geraldo L., E-mail: geraldo_lemos10@hotmail.com [Centro de Medicina Nuclear de Pernambuco (CEMUPE), Recife, PE (Brazil); Oliveira, Alex C.H., E-mail: oliveira_ach@yahoo.com [Universidade Federal de Pernambuco (DEN/UFPE), Recife, PE (Brazil). Dept. de Energia Nuclear; Lopes Filho, Ferdinand J.; Vieira, Jose W., E-mail: ferdinand.lopes@oi.com.br, E-mail: jose-wilson59@live.com [Instituto Federal de Pernambuco (IFPE), Recife, PE (Brazil)

    2014-07-01

    Nuclear Medicine is a medical modality that makes use of radioactive material 'in vivo' in humans, making them a temporary radioactive source. The radiation emitted by the patient's body is detected by a specific equipment, called a gamma camera, creates an image showing the spatial and temporal biodistribution of radioactive material administered to the patient. Therefore, it's of fundamental importance a number of specific measures to make sure that procedure be satisfactory, called quality control. To Nuclear Medicine, quality control of gamma camera has the purpose of ensuring accurate scintillographic imaging, truthful and reliable for the diagnosis, guaranteeing visibility and clarity of details of structures, and also to determine the frequency and the need for preventive maintenance of equipment. To ensure the quality control of the gamma camera it's necessary to use some simulators, called phantom, used in Nuclear Medicine to evaluate system performance, system calibration and simulation of injuries. The goal of this study was to validate a new simulator for nuclear medicine, the Hydra phantom. The phantom was initially built for construction of calibration curves used in radiotherapy planning and quality control in CT. It has similar characteristics to specific phantoms in nuclear medicine, containing inserts and water area. Those inserts are regionally sourced materials, many of them are already used in the literature and based on information about density and interaction of radiation with matter. To verify its efficiency in quality control in Nuclear Medicine, was performed a test for uniformity field, one of the main tests performed daily, so we can verify the ability of the gamma camera to reproduce a uniform distribution of the administered activity in the phantom, been analysed qualitatively, through the image, and quantitatively, through values established for Central Field Of View (CFOV) and Useful Field Of View (UFOV). Also, was evaluated their ability to simulate different tissues of human body parts, without being in contact with radioactive material, called low uptake 'hipocaptantes' areas using the inserts. The Hydra phantom is valid for use in the test for uniformity field in nuclear medicine, that can be made available for purposes of study, research and test for quality control. In addition, it can be enhanced and used in other tests for quality control, and be a basis model for developing new models of physical phantoms. (author)

  19. Development of special ionization chambers for a quality control program in mammography; Desenvolvimento de camaras de ionizacao especiais para controle de qualidade em mamografia

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Jonas Oliveira da

    2013-07-01

    Mammography is an imaging method that uses X-rays. The use of ionization chambers in mammography quality control programs presents an essential role which is to verify whether the parameters of the patient exposure are correct. However, the commercial ionization chambers for dosimetry in mammography represent a high cost for small and medium size clinics that wish to have this equipment or for professionals that work with quality control programs. The innovative feature of this work was to develop ionization chambers for this purpose. In this work ionization chambers for X radiation beams in the mammography energy range were designed, constructed and characterized. The ionization chambers were tested in standard X radiation beams at the LCI/IPEN. The main characterization tests performed with the ionization chambers were: saturation curve, linearity of response, angular and energy dependence. The response stability tests of the ionization chambers were also conducted at the LCI, presenting results within 2.0 % for long-term stability. The results of the remaining tests are in accordance with international standards. These ionization chambers were also submitted to quality control tests of mammography equipment: linearity of the air kerma rates, determination of half-value layers and mean glandular doses. The results for air kerma rate linearity were less than 10 %, as recommended in international standards. The mean glandular dose obtained with the developed chambers presented values comparable to those of commercial ionization chambers tested, with an estimated variation within international standards. (author)

  20. Selection of a conventional power distribution transformer as a voltage source for saline chambers; Seleccion de un transformador de distribucion convencional como fuente de voltaje en camaras salinas

    Energy Technology Data Exchange (ETDEWEB)

    Garza Macias, Anibal [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1988-12-31

    In the Mexico`s Gulf Coast and in the North East part of the country there are severe pollution problems on the electric distribution power systems insulators. To solve this problem, in specialized laboratories are reproduced the pollution conditions for their quantitative and qualitative analyses. In general terms, for this purpose special voltage transformers have been used that, for being imported, are very expensive; furthermore there is no defined selection criterion that allows the voltage source to supply the current recommended by the IEC (International Electrotechnical Commission). In this article, a proposal is presented to select a transformer that fulfills the IEC requirements. This equipment, because of its acquisition easiness and economy, permits that any teaching or research institution have a voltage source that allows the experimentation of the pollution phenomena at a minimum cost. [Espanol] En la costa del Golfo de Mexico y en el noroeste del pais hay severos problemas de contaminacion en los aisladores de los sistemas electricos de distribucion. Para solucionar este problema, se reproducen, en laboratorios especializados, las condiciones de contaminacion para su analisis cualitativo y cuantitativo. En general, con este proposito se han utilizado transformadores especiales de voltaje que por ser de importacion son muy costosos; ademas, no existe un criterio definido de seleccion que permita suministrar a la fuente de voltaje la corriente recomendada por el IEC (International Electrotechnical Commission). En este articulo se presenta una propuesta para seleccionar un transformador que cumpla con los requerimientos del IEC. Esta, por su facilidad de adquisicion y economia, permite que cualquier institucion docente o de investigacion cuente con una fuente de voltaje que permita la experimentacion de los fenomenos contaminantes con un costo minimo.

  1. Comparison of the half-value layer: ionization chambers vs solid-state meters; Comparacao entre medidas de camada semirredutora: camara de ionizacao vs medidores de estado solido

    Energy Technology Data Exchange (ETDEWEB)

    Pereira, L.C.S.; Navarro, V.C.C.; Navarro, M.V.T.; Macedo, E.M., E-mail: larapereira@ifba.edu.br [Instituto Federal da Bahia (LABPROSAUD/IFBA), Salvador, BA (Brazil). Laboratorio de Produtos para a Saude

    2015-07-01

    Generally, the half value layer (HVL) is determined by using ionization chambers and aluminum filters. However, some solid-state dosimeters allow simultaneous measurements of X-ray's parameters, among which the HVL. The main objective of this study was to compare the HVL's values indicated by four different solid-state dosimeters, whose values were measured by ionization chambers. The maximum difference found between the two methods was 11.42%, one the solid-state dosimeters, showing that the use these instruments to determine CSR in industrial X-ray should be subject to a more thorough evaluation. (author)

  2. Electret ionization chamber: a new method for detection and dosimetry of thermal neutrons; Camara de ionizacao de eletretos: um novo metodo para deteccao e dosimetria de neutrons termicos

    Energy Technology Data Exchange (ETDEWEB)

    Ghilardi, A J.P.

    1988-12-31

    An electret ionization chamber with boron coated walls is presented as a new method for detecting thermal neutrons. The efficiency of electret ionization chambers with different wall materials for the external electrode was inferred from the results. Detection of slow neutrons with discrimination against the detection of {gamma}-rays and energetic neutrons was shown to depend on the selection of these materials. The charge stability over a long period of time and the charge decay owing to natural radiation were also studied. Numerical analysis was developed by the use of a micro-computer PC-XT. Both the experimental and numerical results show that the sensitivity of the electret ionization chamber for detection of thermal neutrons is comparable with that of the BF{sub 3} ionization chamber and that new technologies for deposition of the boron layer will produce higher efficiency detectors. (author). 102 refs, 32 fig, 10 tabs.

  3. Change of the natural radiation exposure due to agriculture and industrial activities in a high natural radioactivity area from Brazil; Modificacao da exposicao a radiacao natural devido a atividades agricolas e industriais numa area de radioatividade natural elevada no Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Silva Amaral, E.C. da

    1993-12-31

    The Pocos de Caldas Plateau, Minas Gerais State one of the biggest alkaline intrusions in the world. This study has shown the expected value for the mean annual radiation exposure due to the agricultural activities ranges from 6 up to 14 mSv/a depending on the age and living habits of the population group. The inhalation exposure of radon, thoron and their progenies represents the largest radiological health hazard (70-90%); this is followed by the external gamma irradiation from soil (10-25%). Ingestion of natural radionuclides with local food is only of minor radiological consequence. It was found that the lethal cancer risk might increase by 4% for a person born at the plateau, living and working there for the rest of her life. For the remote population the consumption the consumption of food products exported from the plateau leads to an expected value for the collective dose of 19 man Sv/a. This corresponding nominally to the small calculated number of 1 additional case of cancer per year. Therefore the main radiation impact of the agricultural activities are not the increased concentrations of natural radionuclides in food products but the fact that they are produced there with human labor and thus increasing the radiation exposure to a large number of farm workers and their families that move for occupational reasons to that region. The radiation exposure due to the mining and milling activities is, in spite of the significant increase of radionuclide activity concentrations in river waters, only of the order of 0.3 mSv/a. However as a recognized industrial source the ICRP dose limitation system has to be applied. Under this aspect the exposure calculated here, 0.3 mSv/a, should be considered as acceptable. (author). 93 refs, 16 figs, 58 tabs.

  4. Dose calculation for {sup 40}K ingestion in samples of beans using spectrometry and MCNP; Calculo de dose devido a ingestao de {sup 40}K em amostras de feijao utilizando espectrometria e MCNP

    Energy Technology Data Exchange (ETDEWEB)

    Garcez, R.W.D.; Lopes, J.M.; Silva, A.X., E-mail: marqueslopez@yahoo.com.br [Coordenacao dos Programas de Pos-Graduacao em Engenharia (COPPE/PEN/UFRJ), Rio de Janeiro, RJ (Brazil). Centro de Tecnologia; Domingues, A.M. [Universidade Federal Fluminense (UFF), Niteroi, RJ (Brazil). Instituto de Fisica; Lima, M.A.F. [Universidade Federal Fluminense (UFF), Niteroi, RJ (Brazil). Instituto de Biologia

    2014-07-01

    A method based on gamma spectroscopy and on the use of voxel phantoms to calculate dose due to ingestion of {sup 40}K contained in bean samples are presented in this work. To quantify the activity of radionuclide, HPGe detector was used and the data entered in the input file of MCNP code. The highest value of equivalent dose was 7.83 μSv.y{sup -1} in the stomach for white beans, whose activity 452.4 Bq.Kg{sup -1} was the highest of the five analyzed. The tool proved to be appropriate when you want to calculate the dose in organs due to ingestion of food. (author)

  5. A methodology to establish the appearance of cancer cases due to radiation dose in compressed breast; Uma metodologia para comprovar o aparecimento de casos de cancer devido a dose de radiacao na mama comprimida

    Energy Technology Data Exchange (ETDEWEB)

    Feital, Joao Carlos Da Silva; Delgado, Jose Ubiratan; Peixoto, Jose Guilherme P.; Fonseca, Hugo Geraldo Da, E-mail: jfeital@ird.gov.br, E-mail: delgado@ird.gov.br, E-mail: guilherm@ird.gov.br, E-mail: hfonseca@ird.gov.br [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil)

    2013-10-01

    It is known that more than 20% of the world's population will contract some type of cancer. In Brazil, with the exception of skin cancer (non melanoma) the breast cancer ranks first among the higher frequency of tumours among women and in general, although the methods of detection are advancing in the year 2010 took place about 13 thousand deaths in about 50,000 cases, probably due to late detection of these neoplasm. New cases of breast cancer in a given population can be proven from absorbed dose quantity, calculated for the compressed breast, due to the risk by means of exposure to x rays in this radiodiagnostic practices. Methodology: Exposures were held in an ionization chamber and the other quantities required were obtained to the screen-film equipment of mammography. Results: Also experimental results were of compressed breast an equivalent dose of ( 1.82 mSv {+-} 0.2%) or (3.64 mSv {+-} 0.2%) for both projections, i.e. medium lateral oblique and cranio caudal. The experimental value obtained here is consistent with the calculated results and published in the literature for analog and CR equipment. Conclusion: From the result of dose equivalent in the breast, one can say that there will be effectively attesting as to the appearance of new cases of cancer if approximately 80 million women are exposed to radiation emitted by mammographers. (author)

  6. Change of the natural radiation exposure due to agriculture and industrial activities in a high natural radioactivity area from Brazil; Modificacao da exposicao a radiacao natural devido a atividades agricolas e industriais numa area de radioatividade natural elevada no Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Silva Amaral, E.C. da

    1992-12-31

    The Pocos de Caldas Plateau, Minas Gerais State one of the biggest alkaline intrusions in the world. This study has shown the expected value for the mean annual radiation exposure due to the agricultural activities ranges from 6 up to 14 mSv/a depending on the age and living habits of the population group. The inhalation exposure of radon, thoron and their progenies represents the largest radiological health hazard (70-90%); this is followed by the external gamma irradiation from soil (10-25%). Ingestion of natural radionuclides with local food is only of minor radiological consequence. It was found that the lethal cancer risk might increase by 4% for a person born at the plateau, living and working there for the rest of her life. For the remote population the consumption the consumption of food products exported from the plateau leads to an expected value for the collective dose of 19 man Sv/a. This corresponding nominally to the small calculated number of 1 additional case of cancer per year. Therefore the main radiation impact of the agricultural activities are not the increased concentrations of natural radionuclides in food products but the fact that they are produced there with human labor and thus increasing the radiation exposure to a large number of farm workers and their families that move for occupational reasons to that region. The radiation exposure due to the mining and milling activities is, in spite of the significant increase of radionuclide activity concentrations in river waters, only of the order of 0.3 mSv/a. However as a recognized industrial source the ICRP dose limitation system has to be applied. Under this aspect the exposure calculated here, 0.3 mSv/a, should be considered as acceptable. (author). 93 refs, 16 figs, 58 tabs.

  7. Cardiogenic shock due to citomegalovirus myocarditis: successful clinical treatment Choque cardiogênico devido à miocardite por citomegalovírus: terapêutica clínica com sucesso

    Directory of Open Access Journals (Sweden)

    José Francisco Baumgratz

    2010-06-01

    Full Text Available OBJECTIVE: Cytomegalovirus (CMV systemic disease and myocarditis in healthy persons is infrequently reported in the literature, although in increasing numbers in recent years. The importance of the recognition of the syndrome that usually has an initial picture of a mononucleosis like infection in an otherwise healthy person, is the available therapeutic agent, ganciclovir, that can cure the infectious disease. METHODS: We analyzed the clinical result of pulsotherapy with steroids in a patient with CMV myocarditis after 7 days of etiological treatment, with ganciclovir, intravenous vasodilators, and the conventional treatment for congestive heart failure. RESULTS: The clinical condition of the patient improved accordingly to the better function of the left ventricle, and the ganciclovir was kept for 21 days, most of it in an out patient basis. The patient was dismissed from the hospital, with normal myocardial function. CONCLUSION: Potentially curable forms of myocarditis, like M pneumoniae and CMV, for example, can have an initial disproportionate aggression to the myocardium, by the acute inflammatory reaction, that can by itself make worse the damage to the LV function. In our opinion, the blockade of this process by pulsotherapy with steroids can help in the treatment of these patients. We understand that the different scenario of immunosuppressive treatments for the possible auto immunity of the more chronic forms of the presumably post viral cardiomyopathy has been in dispute in the literature, and has stolen the focus from the truly acute cases.OBJETIVO: Doença sistêmica por citomegalovírus (CMV com miocardite em pessoas saudáveis é raramente referida na literatura, apesar de em maior número em anos recentes. A importância do reconhecimento da síndrome, que usualmente tem um quadro inicial "mononucleosis like" em uma pessoa sadia é a disponibilidade do agente terapêutico ganciclovir, que pode curar a infecção. MÉTODOS: Nós analisamos o resultado da pulsoterapia com esteróides em um paciente com miocardite por CMV, após 7 dias de tratamento etiológico com ganciclovir, vasodilatadores intravenosos e o tratamento convencional para insuficiência cardíaca congestiva. RESULTADOS: A condição clínica do paciente melhorou com a melhor função do ventrículo esquerdo e o ganciclovir foi mantido por 21 dias após alta hospitalar.A função miocárdica retornou ao normal. CONCLUSÃO: Formas curáveis de miocardites como M pneumonia e CMV, por exemplo, podem ter uma agressão grave ao miocárdio por uma ação inflamatória que pode piorar a função cardíaca. Em nossa opinião, o bloqueio deste processo pela pulsoterapia com esteróides pode auxiliar no tratamento destes pacientes. Entendemos que existe um cenário diferente de tratamento com imunossupressores para possível agressão auto-imune das formas mais crônicas de cardiomiopatias dilatadas e isso está em disputa na literatura, talvez mudando o foco dos casos realmente agudos.

  8. Process business risk: a methodology for assessing and mitigating the financial impact of process plant accidents; Avaliacao de risco ao negocio devido a acidentes de processo em plantas industriais

    Energy Technology Data Exchange (ETDEWEB)

    Almeida, Ana Cristina C.; Bardy, Mariana B. [Det Norske Veritas (Brazil)

    2008-07-01

    Traditional risk management has focused on effects on people, particularly when using Quantitative Risk Assessment (QRA). A much broader approach is being adopted nowadays, with companies beginning to consider potential accidental losses in their decision making process. This paper describes a study where business risks from major accident hazards were assessed for a large petrochemical plant. The results are presented as F-Cost curves, which are similar to traditional F-N curves, but represent cumulative frequencies of events versus their cost, instead of fatalities. A different variety of costs can be evaluated as property damage, business interruption, inventory loss, environmental loss, clean-up costs, legal costs, fatality and injury costs, amongst others. As final objective of the study insurance values can be adjusted as well as decisions on reducing risk can be made based on the actual benefit, considering the reduction of losses and the amount to be spent on mitigating major risks. Also, values for civil liability insurance can be reviewed, based on the hazards that can result in fatalities and injuries, as well as property losses, for third parties. This paper presents the results of a study which involved the evaluation of the company's civil liability. The key driver was to consider a more accurate value for the company insurance policy, considering the different losses that major accident can lead on for a community and industries located nearby a petrochemical plant. The results of the analysis are presented as F-Cost curves and we describe the risk-based decision making process and criteria adopted by the company to set the maximum loss value to be insured for civil liability. In conclusion, this paper presents results from a real life example of the application of the quantitative evaluation of business risks, illustrating that a financial or business risk approach can help management in day-to-day decisions when considering possible effects of major chemical process accidents. (author)

  9. A case of acute diarrhea due to the emerging pathogen Campylobacter jejuni subsp. doylei in Southern Chile Um caso de diarréia aguda devido ao patógeno emergente Campylobacter jejuni subsp. doylei no sul do Chile

    Directory of Open Access Journals (Sweden)

    Heriberto Fernández

    2003-04-01

    Full Text Available The first documented case of acute diarrhea due to C. jejuni subsp. doylei in Chile is reported. The clinical findings, the absence of other enteropathogens, virus or parasites and the fact that C. jejuni subsp. doylei was the only bacteria isolated support the assumption that it was the etiological agent of this diarrheal case.O primeiro caso documentado de diarréia aguda por C. jejuni subsp. doylei no sul do Chile é apresentado. As características clínicas, a ausência de outros enteropatógenos, vírus ou parasitas, e o fato de C. jejuni subsp. doylei ter sido a única bactéria isolada, permitem assumir que este microrganismo é o agente etiológico neste caso de diarréia.

  10. Hemolytic disease of the newborn due to anti-U Doença hemolítica do recém-nascido devido a anti-U

    Directory of Open Access Journals (Sweden)

    Marcia Cristina Zago Novaretti

    2003-01-01

    Full Text Available Anti-U is a rare red blood cell alloantibody that has been found exclusively in blacks. It can cause hemolytic disease of the newborn and hemolytic transfusion reactions. We describe the case of a female newborn presenting a strongly positive direct antiglobulin test due to an IgG antibody in cord blood. Anti-U was recovered from cord blood using acid eluate technique. Her mother presented positive screening of antibodies with anti-U identified at delivery. It was of IgG1 and IgG3 subclasses and showed a titer of 32. Monocyte monolayer assay showed moderate interaction of Fc receptors with maternal serum with a positive result (3.1%. The newborn was treated only with 48 hours of phototherapy for mild hemolytic disease. She recovered well and was discharged on the 4th day of life. We conclude that whenever an antibody against a high frequency erythrocyte antigen is identified in brown and black pregnant women, anti-U must be investigated.Anti-U é um aloanticorpo eritrocitário raro detectado exclusivamente em negros, que pode causar doença hemolítica do recém-nascido e reações transfusionais hemolíticas. Relatamos o caso de um recém-nascido, de sexo feminino, que apresentou teste de antiglobulina direto fortemente positivo, dirigido a um anticorpo IgG em sangue de cordão umbilical. Anti-U foi identificado por técnica de eluição ácida. A mãe apresentava pesquisa de anticorpos irregulares positiva com anticorpo anti-U, de subclasses IgG1 e IgG3, título 32, identificado ao nascimento. O ensaio de monocamada de monócitos apresentou resultado positivo (3.1%, mostrando uma interação moderada de receptores Fc com soro materno. O recém-nascido foi tratado somente por fototerapia durante 48 horas para uma doença hemolítica leve. A criança recuperou-se bem e teve alta médica no quarto dia de vida. Concluímos que quando um anticorpo contra um antígeno eritrocitário de alta freqüência for identificado em gestantes negras e pardas, anti-U deve ser investigado.

  11. Monte Carlo method for dose calculation due to oral X-rays; Coeficientes de conversao para calculo de doses devidos a radiografias odontologicas utilizando o metodo de Monte Carlo

    Energy Technology Data Exchange (ETDEWEB)

    Loureiro, Eduardo Cesar de Miranda

    1998-06-01

    The increasing utilization of oral X-rays, especially in youngsters and children, calls for the assessment of equivalent doses in their organs and tissues. With this purpose, a Monte Carlo code was adapted to simulate an X-ray source irradiating phantoms of the MIRD-5 type with different ages (10, 15 and 40 years old) to calculate the conversion coefficients which transform the exposure at skin to equivalent doses at several organs and tissues of interest. In order to check the computer program, simulations were performed for adult patients using the original code (ADAM.FOR developed at the GSF-Germany) and the adapted program (MCDRO.PAS). Good agreement between results obtained with both codes was observed. Irradiations of the incisive, canine and molar teeth were simulated. The conversion factors were calculated for the following organs and tissues: thyroid, active bone narrow (head and whole body), bone (facial skeleton, cranium and whole body), skin (head and whole body) and crystalline. Based on the obtained results, it follows that the younger the patient and the larger the field area, the higher the dose in assessed organs and tissues. The variation of the source-skin distance does not change the conversion coefficients. On the other hand, the increase in the voltage applied to the X-ray tube causes an increase in the calculated conversion coefficients. (author)

  12. Alterações hemodinâmicas devido ao uso de estabilizadores em revascularização do miocárdio: estudo experimental Hemodynamic disorders related to beating heart surgery using cardiac stabilizers: experimental study

    Directory of Open Access Journals (Sweden)

    Pedro Paulo Martins de Oliveira

    2007-12-01

    Full Text Available OBJETIVO: Estudar, em suínos, as alterações hemodinâmicas secundárias ao uso de estabilizadores para operações de revascularização do miocárdio sem circulação extracorpórea, um por sucção (Octopus e outro por compressão (Speroni. MÉTODOS: Dez suínos submetidos à esternotomia e monitorizados com eletrocardiograma, débito cardíaco contínuo e pressões: arterial média, pulmonar média, atriais médias direita e esquerda, ventriculares diastólicas direita e esquerda, calculando-se volume sistólico e resistência vascular sistêmica. Estudaram-se os estabilizadores posicionados em três artérias: interventricular anterior, interventricular posterior e ramo marginal da circunflexa. Para cada animal foi sorteada a ordem de aplicação do estabilizador com relação ao tipo e à artéria. As mensurações foram realizadas antes e após aplicar-se o estabilizador. RESULTADOS: Na artéria interventricular anterior, ocorreram alterações somente com o Speroni, havendo queda do débito cardíaco, do volume sistólico e da pressão arterial média, com aumento da resistência vascular sistêmica. Na artéria interventricular posterior, constatamos alterações com o Speroni, havendo queda do débito cardíaco e do volume sistólico, com aumento da freqüência cardíaca. Com o Octopus houve aumento da freqüência cardíaca e da resistência vascular sistêmica, com queda do volume sistólico. No ramo marginal da circunflexa, ocorreu queda do débito cardíaco, do volume sistólico e da pressão arterial média com os dois estabilizadores, havendo também queda na pressão arterial pulmonar média e aumento da pressão atrial direita média com o estabilizador por compressão. CONCLUSÕES: Ambos os estabilizadores causaram alterações hemodinâmicas. O que atua por compressão provocou mais alterações do que o que atua por sucção.OBJECTIVE: To study in swine the hemodynamic changes secondary to the use of stabilizers for off-pump coronary artery bypass graft surgeries by means of both a suction device "Octopus" and a compression device (Speroni. METHODS: Ten swine underwent median sternotomy. Monitoring of ECG, continuous cardiac output, mean arterial pressure, mean pulmonary artery pressure, mean right and left atrial pressures, and right and left ventricular diastolic pressure were performed. Stroke volume and systemic vascular resistance were calculated. Both stabilizers were studied placed on three vessels: anterior interventricular branch, posterior interventricular branch, and marginal branch of the circumflex branch. Each animal was randomly designed to application regarding the type of stabilizer and the target artery. The measurements were carried out 5 minutes before and after the stabilizer application. RESULTS: In the anterior interventricular branch changes have occurred only with the compression device, thus reducing cardiac output, stroke volume, and mean arterial pressure, but increasing the systemic vascular resistance. In the posterior interventricular branch changes have occurred with the compression device (Speroni, reducing cardiac output and stroke volume, but increasing the heart rate. With the suction device (octopus there was an increase of both heart rate and systemic vascular resistance, but a decrease in stroke volume. In the marginal branch of the circumflex branch there was a decrease of cardiac output, stroke volume, and mean arterial pressure with both stabilizers. Also, there was a decrease in the mean pulmonary artery pressure and an increase in the mean right atrial pressure with the compression device (Speroni. CONCLUSION: Both stabilizers have caused hemodynamic changes. The compression device (Speroni is more associated with changes than the suction device (Octopus.

  13. Development of methodologies for internal exposure assessment due to the radiopharmaceutical {sup 18}FDG; Desenvolvimento de metodologias para avaliacao da exposicao ocupational interna devido ao radiofarmaco {sup 18}FDG

    Energy Technology Data Exchange (ETDEWEB)

    Lacerda, Isabelle Viviane Batista de

    2013-07-01

    The production of {sup 18}F has increased in the last decade. It is produced basically for the synthesis of {sup 18}F- fluorodeoxyglucose ({sup 18}FDG), the main radiopharmaceutical used in PET (Positron Emission Tomography) scans. The growth in the frequency of these tests resulted in rise of the number of occupationally exposed individuals (OEI) to the radionuclide {sup 18}F as {sup 18}FDG, increasing thereby the probability of its accidental incorporation. This study aimed to implement optimized techniques for assessing internal exposures of individuals occupationally exposed through both in vivo and in vitro bioassay methods during production and handling of {sup 18}FDG at the Divisao de Producao de Radiofarmacos (DIPRA), Centro Regional de Ciencias Nucleares do Nordeste (CRCN-NE/CNEN). The in vivo monitoring was conducted at the Laboratorio de Dosimetria Interna, Divisao de Laboratorios Tecnico-Cientificos (DILAB). For this bioassay method, measurements were done with a 3x3' NaI(Tl) scintillation detector coupled to Genie 2000 software. The calibration of the system was performed with a brain phantom containing a standard liquid source of {sup 22}Na to simulate a contaminated individual. The calibration of the HPGe coaxial detector for in vitro monitoring was performed at the Laboratorio de Medidas de Atividade de Radionuclideos (DIPRA/CRCN-NE/CNEN) with a standard source of {sup 22}Na. Base on the calibration factors, it was possible to determine the minimum detectable activities (MDA) for the systems by using direct measurements and simulation of uncontaminated urine. Then, through the biokinetic models published by ICRP 106 and edited by the AIDE software (version 6.0), it was possible to estimate the minimum detectable effective dose (MDED), which evaluates the detection sensitivity of the techniques developed. The MDED was estimated for in vivo and in vitro measurements performed 2.4 hours after the occurrence of incorporation by ingestion, since this is the period of higher retention fraction of activity in the brain compartment and accumulated urine for {sup 18}FDG. The values obtained were compared to the recording level of 1 mSv, recommended by the IAEA. After validation of in vivo monitoring technique, measurements of the IOE from DIPRA began shortly after the end of production and quality control procedures. The in vitro internal monitoring was not performed since there was not voluntary participation to obtain the biological sample (urine). The techniques developed showed sufficient sensitivity for application to occupational internal monitoring. (author)

  14. Maternal mortality due to arterial hypertension in São Paulo City (1995-1999 A mortalidade materna devido a hipertensão arterial na cidade de São Paulo (1995-1999

    Directory of Open Access Journals (Sweden)

    Carlos Eduardo Pereira Vega

    2007-01-01

    Full Text Available AIM: To describe the case profile of maternal death resulting from hypertensive disorders in pregnancy and to propose measures for its reduction. METHODS: The Committee on Maternal Mortality of São Paulo City has identified 609 cases of obstetric maternal death between 1995 and 1999 with an underreporting rate of 52.2% and a maternal mortality rate of 56.7/100,000 live births. Arterial hypertension was the main cause of maternal death, corresponding to 142 (23.3% cases. RESULTS: Ninety-five (66.9% of the deaths occurred during the puerperal period and 34 (23.9% occurred during pregnancy. The time of death was not reported in 13 (9.2% cases. Seizures were observed in 41 cases and magnesium sulfate was used in four of them. The causes of death were ruled to be cerebrovascular accident (44.4%, acute pulmonary edema (24.6%, and coagulopathies (14.1%. Cesarean section was performed in 85 (59.9% cases and vaginal delivery in 15 (16.0%. CONCLUSION: Complications of arterial hypertension are responsible for the high rates of pregnancy-related maternal death in São Paulo City. Quality prenatal care and appropriate monitoring of the hypertensive pregnant patient during and after delivery are important measures for better control of this condition and are essential to reduce disorders in pregnancy.OBJETIVO: Descrever o perfil dos casos de morte materna decorrente de complicações da hipertensão arterial e propor medidas para sua redução. MÉTODOS: De 1995 a 1999 o Comitê de Mortalidade Materna da Cidade de São Paulo identificou 609 casos de morte materna obstétrica, com uma subnotificação de 52,2% e um CMM=56,7/100.000 Nascidos Vivos. A hipertensão arterial foi a principal causa de óbito materno, correspondendo a 142 (23,3% casos. RESULTADOS: Ocorreram 95 (66,9% de óbitos no puerpério e 34 (23,9% durante a gestação. Em 13 (9,2% casos não se teve referência ao momento do óbito. Houve relato de crises convulsivas em 41 casos com a utilização de sulfato de magnésio em quatro deles. As principais causas determinantes do óbito foram: o acidente vascular cerebral (44,4%, o edema agudo de pulmão (24,6% e as coagulopatias (14,1%. A cesárea foi realizada em 85 (59,9% casos e o parto vaginal em 15 (16,0%. Em 28 (19,7% casos não foi realizada nenhuma conduta para interromper a gravidez e em 14 (9,8% não se obteve relato do procedimento. CONCLUSÃO: As complicações da hipertensão arterial no ciclo gravídico-puerperal determinam altos índices de mortalidade materna na cidade de São Paulo. A realização de um pré-natal de qualidade e o atendimento apropriado da gestante hipertensa no parto e no pós-parto são medidas de fundamental importância para um melhor controle desse evento, sendo primordial para a redução dessas ocorrências.

  15. RELACIONAMENTO ENTRE A MUDANÇA DA REDE DE DRENAGEM DEVIDO À CONSTRUÇÃO DE ESTRUTURAS URBANAS E O SURGIMENTO DE VOÇOROCAS NO BAIRRO DO JARDIM BOTÂNICO NO DISTRITO FEDERAL

    Directory of Open Access Journals (Sweden)

    Leonardo Figueiredo de Freitas

    2013-09-01

    Full Text Available A alteração da superfície do terreno em decorrência da urbanização, por meio da instalação de estruturas como arruamentos e edificações, altera significativamente a dinâmica do escoamento superficial. Uma das consequências dessa alteração é a concentração do escoamento, o que pode desencadear o aparecimento de processos erosivos, como ravinas e voçorocas. Nesses processos além dos impactos a jusante, o avanço das erosões ameaça a própria estrutura urbana. O presente trabalho tem como objetivo aplicar um método desenvolvido para identificar zonas suscetíveis à ocorrência de processos erosivos no bairro do Jardim Botânico no Distrito Federal. O método é baseado na definição de dois cenários: (a pré-urbanização e (b pós-urbanização. Para estes cenários foram gerados modelos digitais de terreno e mapas de fluxo acumulado. A partir da subtração dos mapas de fluxo acumulado foram apontadas as zonas que receberam aumento ou redução do fluxo em decorrência da urbanização. O resultado dessa análise ficou altamente correlacionado com as erosões identificadas, bem como se constatou que a declividade é fundamental na definição das zonas suscetíveis. Esse método pode ser utilizado para auxiliar no planejamento de novas áreas de expansão urbana, ou, para replanejar áreas já existentes, em regiões com características semelhantes as do Distrito Federal.

  16. Estudo da variação da resistência ao cisalhamento do resíduo solido urbano devido a presença de plástico mole

    OpenAIRE

    Gawlik, Francismara Martins

    2014-01-01

    A influencia do plástico mole na resistência ao cisalhamento do resíduo solido urbano (RSU) vem sendo alvo constante de estudo em virtude da sua enorme relevância nesta questão. No entanto trata-se de um tema complexo, visto que, são muitas as variáveis relacionadas ao problema, tais como, a quantidade de plástico, influencia do chorume em contanto com o plástico, inclinação do plástico em relação aos esforços normais e cisalhantes, resistência à tração do plástico, questões relacionadas à mo...

  17. Reconstructive dosimetry and radiation doses evaluation of members of the public due to radiological accident in industrial radiography; Dosimetria reconstrutiva e avaliacao de dose de individuos do publico devido a acidente radiologico em radiografia industrial

    Energy Technology Data Exchange (ETDEWEB)

    Lima, Camila Moreira Araujo de

    2016-07-01

    Radiological accidents have occurred mainly in the practices recognized as high risk radiological and classified by the IAEA as Categories 1 and 2, and highlighted the radiotherapy, industrial irradiators and industrial radiography. In Brazil, since there were five major cases in industrial radiography, which involved 7 radiation workers and 19 members of the public, causing localized radiation lesions on the hands and fingers. One of these accidents will be the focus of this work. In this accident, a {sup 192}Ir radioactive source was exposed for more than 8 hours in the workplace inside a company, exposing radiation workers, individuals of the public and people from the surrounding facilities, including children of a school. The radioactive source was also handled by a security worker causing severe radiation injuries in the hand and fingers. In this paper, the most relevant and used techniques of reconstructive dosimetry internationally are presented. To estimate the radiation doses received by exposed individuals in various scenarios of radiological accident in focus, the following computer codes were used: Visual Monte Carlo Dose Calculation (VMC), Virtual Environment for Radiological and Nuclear Accidents Simulation (AVSAR) and RADPRO Calculator. Through these codes some radiation doses were estimated, such as, 33.90 Gy in security worker's finger, 4.47 mSv in children in the school and 55 to 160 mSv for workers in the company during the whole day work. It is intended that this work will contribute to the improvement of dose reconstruction methodology for radiological accidents, having then more realist radiation doses. (author)

  18. Dose evaluation due to the effluent liberation by medical installations at city of Rio de Janeiro, Brazil; Avaliacao de doses devido a liberacao de efluentes por instalacoes medicas na cidade do Rio de Janeiro

    Energy Technology Data Exchange (ETDEWEB)

    Shu, Jane; Rochedo, Elaine R.R., E-mail: jshu@cnen.gov.b, E-mail: erochedo@cnen.gov.b [Comissao Nacional de Energia Nuclear (CODIN/CNEN), Rio de Janeiro, RJ (Brazil). Coordenacao de Instalacoes Nucleares; Heilbron, Paulo F.L., E-mail: paulo@cnen.gov.b [Comissao Nacional de Energia Nuclear (COREJ/CNEN), Rio de Janeiro, RJ (Brazil). Coordenacao de Rejeitos; Crispim, Verginia R., E-mail: verginia@con.ufrj.b [Coordenacao dos Programas de Pos-Graduacao de Engenharia (COPPE/UFRJ), Rio de Janeiro, RJ (Brazil). Programa de Engenharia Nuclear

    2011-10-26

    This paper, the city of Rio de Janeiro was taken as a case study. It was processed deterministic and probabilistic simulations vor evaluation of the dose in two exposure sceneries, one of them referring to public members exposure and the other relative to exposure of sewage sanitary treatment plant workers. The results showed that at present the doses for inhabitants of the city and operators of treatment station are lower to dose limit established for the public, the approach presently in use in Brazil is not sufficient to accomplish whit international requirements and the regulation should be revised to be adopted specific values for each radionuclide

  19. Imaging findings and cerebral perfusion in arterial ischemic stroke due to transient cerebral arteriopathy in children; Achados de imagem e perfusao arterial cerebral em acidente vascular cerebral isquemico devido a arteriopatia transitoria em crianca

    Energy Technology Data Exchange (ETDEWEB)

    Barbosa Junior, Alcino Alves, E-mail: alcinojr@uol.com.br [Departamento de Diagnostico por Imagem, Hospital Israelita Albert Einstein - HIAE, Sao Paulo, SP (Brazil); Ellovitch, Saada Resende de Souza [Neuropediatria, Hospital Israelita Albert Einstein - HIAE, Sao Paulo, SP (Brazil); Pincerato, Rita de Cassia Maciel [Hospital Samaritano, Sao Paulo, SP (Brazil)

    2012-04-15

    We report the case of a 4-year-old female child who developed an arterial ischemic stroke in the left middle cerebral artery territory, due to a proximal stenosis of the supraclinoid internal carotid artery, most probably related to transient cerebral arteriopathy of childhood. Computed tomography scan, magnetic resonance imaging, perfusion magnetic resonance and magnetic resonance angiography are presented, as well as follow-up by magnetic resonance and magnetic resonance angiography exams. Changes in cerebral perfusion and diffusion-perfusion mismatch call attention. As far as we know, this is the first report of magnetic resonance perfusion findings in transient cerebral arteriopathy. (author)

  20. Collective dose estimation in Portuguese population due to medical exams of diagnostic radiology and nuclear medicine; Estimativa da dose coletiva na populacao portuguesa devido a exames medicos de radiologia de diagnostico e de medicina nuclear

    Energy Technology Data Exchange (ETDEWEB)

    Teles, Pedro; Vaz, Pedro [Instituto Tecnologico e Nuclear, Sacavem (Portugal). Instituto Superior Tecnico; Sousa, M. Carmen de [Instituto Portugues de Oncologia de Coimbra (Portugal); Paulo, Graciano; Santos, Joana [Escola Superior de Tecnologia da Saude de Coimbra (Portugal); Pascoal, Ana [Kings College Hospital, London (United Kingdom). Kings Health Partners; Cardoso, Gabriela; Santos, Ana isabel [Hospital Garcia de Orta, Almada (Portugal); Lanca, Isabel [Administracao Regional de Saude, Coimbra (Portugal); Matela, Nuno [Universidade de Lisboa (Portugal). Fac. de Ciencias. Instituto de Biofisica e Engenharia Biomedica; Janeiro, Luis [Escola superior de Saude da Cruz Vermelha Portuguesa, Lisboa (Portugal); Sousa, Patrick [Laboratorio de Instrumentacao e Fisica Experimental de Particulas, Lisboa (Portugal); Carvoeiras, Pedro; Parafita, Rui [Medical Consult, SA, Lisboa (Portugal); Simaozinho, Paula [Administracao Regional de Saude, Faro (Portugal)

    2013-11-01

    In order to assess the exposure of the Portuguese population to ionizing radiation due to medical examinations of diagnostic radiology and nuclear medicine, a working group, consisting of 40 institutions, public and private, was created to evaluation the coletive dose in the Portuguese population in 2010. This work was conducted in collaboration with the Dose Datamed European consortium, which aims to assess the exposure of the European population to ionizing radiation due to 20 diagnostic radiology examinations most frequent in Europe (the 'TOP 20') and nuclear medicine examinations. We obtained an average value of collective dose of Almost-Equal-To 1 mSv/caput, which puts Portugal in the category of countries medium to high exposure to Europe. We hope that this work can be a starting point to bridge the persistent lack of studies in the areas referred to in Portugal, and to enable the characterization periodic exposure of the Portuguese population to ionizing radiation in the context of medical applications.

  1. Intrinsic spatial resolution limitations due to differences between positron emission position and annihilation detection localization; Limitacoes da resolucao espacial intrinseca devido as diferencas entre a posicao da emissao do positron e a deteccao da localizacao de aniquilacao

    Energy Technology Data Exchange (ETDEWEB)

    Perez, Pedro; Malano, Francisco; Valente, Mauro, E-mail: valente@famaf.unc.edu.ar [Universidad Nacional de Cordoba, Cordoba (Argentina). Fac. de Matematica, Astronomia y Fisica (FaMAF)

    2012-07-01

    Since its successful implementation for clinical diagnostic, positron emission tomography (PET) represents the most promising medical imaging technique. The recent major growth of PET imaging is mainly due to its ability to trace the biologic pathways of different compounds in the patient's body, assuming the patient can be labeled with some PET isotope. Regardless of the type of isotope, the PET imaging method is based on the detection of two 511-keV gamma photons being emitted in opposite directions, with almost 180 deg between them, as a consequence of electron-positron annihilation. Therefore, this imaging method is intrinsically limited by random uncertainties in spatial resolutions, related with differences between the actual position of positron emission and the location of the detected annihilation. This study presents an approach with the Monte Carlo method to analyze the influence of this effect on different isotopes of potential implementation in PET. (author)

  2. False positive reaction due to endogenous biotin activity in glandular epithelium of decidua Reação falso positiva em epitélio glandular da decídua devido a atividade endógena de biotina

    Directory of Open Access Journals (Sweden)

    Liliana Cruz Spano

    2005-06-01

    Full Text Available Biotin-labeled probe was used in an in situ hybridisation assay to localize virus infection in formalin-fixed, paraffin embedded tissues taken from eleven abortion cases. Probes for human cytomegalovirus (HCMV, human Parvovirus B19 (B19 and human adenovirus type 2 (HAd2, were labeled with biotin-11-dUTP by nick-translation reaction. Streptavidin-alkaline-phosphatase (SAP was used to detect biotin, followed by 4-nitroblue tetrazolium/5-bromo-4-chloro-3-indolyl phosphate (NBT/BCIP solution. Positive reaction was observed in nucleus of glandular ephitelium cells of decidua either in positive or in negative control at first and second gestational trimester. The reaction was not inhibited with blocking solution for alkaline phosphatase endogenous activity and it persisted even with probes omission. The use of adequate negative control permitted to reveal the presence of nuclear biotin in glandular epithelium of decidua, responsible for false positivity in detection systems involving streptavidin biotin system (StrepABC. The stained cells resembled to cytophatic effect due to herpesvirus, which could induce further misinterpretation. The results obtained in this study strongly recommend that DNA detection by in situ hybridisation reaction in gestational endometrium should be done without using StrepABC system.Sondas marcadas com biotina foram utilizadas neste trabalho para detecção de infecção viral por hibridização in situ em tecidos fixados com formalina e embebidos em parafina de 11 casos obtidos de abortamento. Sondas para citomegalovírus humano (HCMV, parvovírus B19 humano (B19 e adenovírus humano tipo 2 (HAd2, foram marcadas com biotina-11-dUTP através da reação de nick-translation. Estreptavidina conjugada com fosfatase alcalina (SAP seguida por solução de 4-nitro-azul de tetrazolio/5-bromo-4-cloro-3-indolil fosfato (NBT/BCIP foram utilizadas para detecção da biotina após a reação de hibridização. Reação positiva foi observada no núcleo de células do epitélio glandular da decídua tanto no controle positivo quanto no negativo em tecidos de primeiro e segundo trimestre gestacional. Esta reação não foi inibida com solução bloqueadora da atividade endógena de fosfatase alcalina e persistiu mesmo com a omissão das sondas. O uso de controles negativos permitiu revelar atividade endógena de biotina nuclear em epitélio glandular da decídua, responsável por reações falso positivas em sistemas de detecção estreptavidina-biotina (StrepABC. Os resultados obtidos neste estudo fortemente recomendam que a detecção de ADN por hibridização in situ em endométrio gestacional seja feita com outro sistema de detecção que não o StrepABC.

  3. Aplastic crisis due to human parvovirus B19 infection in hereditary hemolytic anaemia Crise aplástica devido à infecção por parvovirus humano B19 em anemia hemolítica hereditária

    Directory of Open Access Journals (Sweden)

    R. C. N. Cubel

    1992-10-01

    Full Text Available Specific anti-B19 IgM was demonstrated in sera from three children showing transient aplastic crisis. A two years-old boy living in Rio de Janeiro suffering from sickle-cell anaemia showed the crisis during August, 1990. Two siblings living in Santa Maria, RS, developed aplastic crisis during May, 1991, when they were also diagnosed for hereditary spherocytosis. For a third child from this same family, who first developed aplastic crisis no IgM anti-B19 was detected in her sera.IgM específica anti-B19 foi demonstrada nos soros de três crianças apresentando aplasia transitória de medula. Um menino de dois anos de idade vivendo no Rio de Janeiro e sendo portador de anemia falciforme, apresentou a crise durante Agosto de 1990. Dois irmãos vivendo em Santa Maria - RS, desenvolveram crise de aplasia em Maio de 1991, quando foram também diagnosticados como portadores de microesferocitose. IgM anti-B19 não foi detectada no soro de uma terceira criança, desta mesma família, a qual primeiramente apresentou crise de aplasia.

  4. Uma abordagem sobre infecções endodônticas

    OpenAIRE

    Pinto, Sara Isabel Tavares

    2016-01-01

    As infeções endodônticas envolvem a invasão e multiplicação de microrganismos na polpa dentária e tecidos periapicais sendo responsáveis por dois tipos de patologias: as patologias pulpares e as patologias periapicais. Relativamente às patologias pulpares destacam-se a pulpite reversível, a pulpite irreversível e a necrose pulpar. Quanto às patologias periapicais, destacam-se o abcesso apical agudo, o abcesso apical crónico, a periodontite apical aguda, a periodontite apical crónica, o granul...

  5. Evaluating uncertainties in the cross-calibration of parallel ion chambers used in electron beam radiotherapy; Avaliacao das incertezas no processo de calibracao cruzada de camaras de placas paralelas utilizadas em feixes de eletrons para radioterapia

    Energy Technology Data Exchange (ETDEWEB)

    Anderson, Ernani; Travassos, Paulo; Ferreira, Max da Silva; Carvalho, Samira Marques de; Silva, Michele Maria da; Peixoto, Jose Guilherme Pereira, E-mail: ernanianderson@hotmail.com [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil); Salmon Junior, Helio Augusto [Grupo COI - Clinicas Oncologicas, Rio de Janeiro, RJ (Brazil)

    2015-07-01

    This study aims to estimative the combined standard uncertainty for a detector parallel plate used for dosimetry of electron beams in linear accelerators for radiotherapy, which has been calibrated by the cross-calibration method. Keeping the combined standard uncertainty next of the uncertainty informed in the calibration certificate of the reference chamber, become possible establish the calibration factor of the detector. The combined standard uncertainty obtained in this study was 2.5 %. (author)

  6. Performance of the Drift Chambers of the CMS Experiment in the Measurement of LHC Muons; Prestaciones de las Camaras de Deriva del Experimento CMS en la Deteccion de Muones del LHC

    Energy Technology Data Exchange (ETDEWEB)

    Dominguez, D.; Fouz, M. C.

    2011-05-13

    This work deals with the study of the performance of the drift chambers of the CMS Barrel Muon detector operating at the LHC. Using the data obtained with pp collisions during the first months os LHC operation we have studied the drift cell efficiency and position resolution, as well as the effect of the existing background noise. The results confirm the excellent performance of the muon chambers. It is expected that it will improve further as statistics increase, thus allowing a correct calibration and alignment of these chambers. (Author) 6 refs.

  7. Results of daily monitoring of positioning MLC multi leaf collimator for Siemens 160 with an array of cameras; Resultados de control diario del poscionamiento del colimador multilaminas 160 MLC de Siemens mediante un array de camaras

    Energy Technology Data Exchange (ETDEWEB)

    Lopez Fernandez, A.; Rodriguez Rodriguez, C.; Martin Martin, G.; Saez Beltran, M.

    2011-07-01

    Modern techniques of radiotherapy, and in particular the intensity-modulated radiotherapy (IMRT), require sub-millimeter accuracy in the positioning of multi leaf collimators to ensure that patients receive the prescribed dose. It is difficult to include checks of positioning accuracy as high on the agendas of regular monitoring of the accelerators of a hospital. This paper presents the results of a method that enables rapid verification of the position of the sheets with an accuracy of tenths of a millimeter by using an ionization chamber array. The procedure has been applied to the daily control of the two accelerators of our service for 12 months.

  8. Comparing of the yield curve of the pediatric X-ray equipment using thermoluminescent dosimeters and cylindrical ionization chamber; Comparacao da curva de rendimento de um aparelho de raios X pediatrico utilizando dosimetros termoluminescentes e camara de ionizacao cilindrica

    Energy Technology Data Exchange (ETDEWEB)

    Filipov, Danielle, E-mail: dfilipov@utfpr.edu.br [Universidade Tecnologica Federal do Parana (UTFPR), Curitiba, PR (Brazil); Schelin, Hugo R., E-mail: ledesmaiorgealberto@gmail.com [Instituto de Pesquisa Pele Pequeno Principe, Curitiba, PR (Brazil); Tilly Junior, Joao G., E-mail: joao.tilly@derax.com.br [Universidade Tecnologica Federal do Parana (UTFPR), Curitiba, PR (Brazil). Hospital de Clinicas

    2014-07-01

    The determination of the yield curve of a radiographic equipment should be realized once a year, or when the unit be serviced. Besides being a requirement of ANVISA, through this test is possible to determine the incident air kerma (at a given point in the center of the beam) - INAK. Based on these concepts, the main objective of this work is the comparison of yield curves of the pediatric X-ray apparatus using two different detectors: one cylindrical ionization chamber and thermoluminescent dosimeters type LiF: Mg, Cu, P, as per protocol RLA / 9/057 IAEA. Then the equation of the yield curve (generated by each detector) was used to determine the INAK of 10 pediatric examinations, performed on this equipment. After the process of calibration of both detectors, they were placed side by side at a focus of the tube equipment for determining the performance of the same curve. Finally, using the curves generated by two detectors, INAK values of the 10 tests were calculated (from the kVp values, and mAs focus-patient of each exams), generating difference values at most 5%. As a conclusion, it can be said that the TLD lithium fluoride doped with Mg, Cu and P and the cylindrical ionization chambers may be used satisfactorily to determine the yield curve, whether as quality control or dosimetry.

  9. Simulation of the Interaction of X-rays with a Gas in an Ionization Chamber by the Monte Carlo Method; Simulacion Monte Carlo de la Interaccion de Rays X con el Gas de una Camara de Ionizacion

    Energy Technology Data Exchange (ETDEWEB)

    Grau Carles, A.; Garcia Gomez-Tejedor, G.

    2001-07-01

    The final objective of any ionization chamber is the measurement of the energy amount or radiation dose absorbed by the gas into the chamber. The final value depends on the composition of the gas, its density and temperature, the ionization chamber geometry, and type and intensity of the radiation. We describe a Monte Carlo simulation method, which allows one to compute the dose absorbed by the gas for a X-ray beam. Verification of model has been carried out by simulating the attenuation of standard X-ray radiation through the half value layers established in the ISO 4037 report, while assuming a Weibull type energy distribution for the incident photons. (Author) 6 refs.

  10. Proposal of a calibration protocol of gamma chambers for estimation of the radionuclides incorporation in emergency situations; Propuesta de un protocolo de calibracion de camaras gamma para estimacion de la incorporacion de radionucleidos en situaciones de emergencia

    Energy Technology Data Exchange (ETDEWEB)

    Dantas, B.M.; Lucena, E.; Dantas, A.L.A.; Araujo, F.; Melo, D. [Instituto de Radioprotecao e Dosimetria, Rio de Janeiro Brasil (Brazil); Teran, M.; Paolino, A. [Facultad de Quimica, Montevideo (Uruguay); Hermida, J.C. [Hospital de Clinicas, Facultad de Medicina, Montevideo (Uruguay); Rojo, A. [Autoridad Regulatoria Nuclear, Buenos Aires (Argentina); Puerta, J.A.; Morales, J. [Universidad Nacional de Colombia, Medellin (Colombia); Lopez B, G.M. [Centro de Proteccion e Higiene de las Radiaciones, Ciudad de la Habana (Cuba); Alfaro, M.; Ruiz, M.A. [Instituto Nacional de Investigaciones Nucleares (Mexico); Videla, R.; Pinones, O. [Comision Chilena de Energia Nuclear, Santiago (Chile); Gonzalez, S. [Instituto Peruano de Energia Nuclear, Lima (Peru); Navarro, T. [Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, Madrid (Spain); Cruz S, R. [International Atomic Energy Agency, Vienna (Australia)

    2006-07-01

    In the last years in several countries has come increasing the concern with the possibility of accidents related to the transport and manipulation of open sources used in nuclear medicine. This carried out to the search of alternative methods for the monitoring of workers and individuals of the public exposed to the radionuclides incorporation like {sup 131} I, {sup 201} Tl, {sup 153} Sm among others. One of the options to assist the demand for monitoring of the radionuclides incorporation is the use of gamma chambers that are medical diagnostic equipment available in the own centers of nuclear medicine. The gamma chambers are used to obtain images of patient to which are administered a radionuclide of well-known activity with diagnostic purposes. These equipment have among its components elements that spectrometric systems like those used in the evaluation of the internal incorporation for direct measurements, reason why besides its use for diagnosis by image they can be gauged with anthropomorphic simulators and also with punctual sources for the quantification of the radionuclides activity, distributed homogeneously in the human body or located in specific organs. This work presents the development of a calibration protocol of gamma chambers for the in vivo determination of radionuclides and it proposes the implementation of the protocol in centers of nuclear medicine of the 9 countries participants of the project OAS-ARCAL-RLA/9/049-LXXVIII - Harmonization of procedures of internal dosimetry (Argentina, Brazil, Colombia, Cuba, Chile, Mexico, Peru, Uruguay and Spain). The protocol is the base to establish an integrated net to attend in the response to emergencies using nuclear medicine centers of public hospitals of the region. The proposal is an additional alternative for the monitoring of people in emergency situations where it is possible and feasible the use of the gamma chambers. This would avoid the person's transport with incorporation suspicion for a conventional whole-body counter when there was a near nuclear medicine center to the place where it happened the accident, diminishing the response time and economizing costs for the implementation of the necessary countermeasures. (Author)

  11. Quality Control Procedures Applied to the CMS Muon Chambers Built at CIEMAT; Procedimientos de Control de Calildad de las Camaras de Muones del Experimento CMS Construidas en el CIEMAT

    Energy Technology Data Exchange (ETDEWEB)

    Fouz, M. C.; Puerta Pelayo, J.

    2004-07-01

    In this document the quality control procedures applied to the CMS muon drift chmabers built at CIEMAT are described. It includes a description of the high voltage and front electronics associated to the chambers. Every procedure is described with detail and a list of the more common problems and possible solutions is given. This document can be considered as a chambert test handbook for beginners. (Author) 3 refs.

  12. Singler-chamber SOFCs based on gadolinia doped ceria operated on methane and propane; Pilas de combustible de una sola camara, basadas en electrolitos de ceria dopada con gadolinia y operadas con metano y propano

    Energy Technology Data Exchange (ETDEWEB)

    Morales, M.; Roa, J. J.; Capdevila, X. G.; Segarra, M.; Pinol, S.

    2010-07-01

    The main advantages of single-chamber solid oxide fuel cells (SOFCs) respect to dual-chamber SOFCs, are to simplify the device design and to operate in mixtures of hydrocarbon (methane, propane...) and air, with no separation between fuel and oxidant. However, this design requires the use of selective electrodes for the fuel oxidation and the oxidant reduction. In this work, electrolyte-supported SOFCs were fabricated using gadolinia doped ceria (GDC) as the electrolyte, Ni + GDC as the anode and LSC(La{sub 0}.5Sr{sub 0}.5CoO{sub 3}-{delta})-GDC-Ag{sub 2}O as the cathode. The electrical properties of the cell were determined in mixtures of methane + air and propane + air. The influence of temperature, gas composition and total flow rate on the fuel cell performance was investigated. As a result, the power density was strongly increased with increasing temperature, total flow rate and hydrocarbon composition. Under optimized gas compositions and total flow conditions, power densities of 70 and 320 mW/cm{sup 2} operating on propane at a temperature of 600 degree centigrade and methane (795 degree centigrade) were obtained, respectively. (Author)

  13. Evaluation of haemodynamic effects in computerized gamma-camera os isossorbide dinitrate in congestive heart failure. Avaliacao em gama-camara computadorizada dos efeitos hemodinamicos do dinitrato de isossorbida na insuficiencia cardiaca congestiva

    Energy Technology Data Exchange (ETDEWEB)

    Lara, P F; Miyazato, A N.P.; Hueb, W A; Paulillo, L F; Oliveira Filho, R.M. de; Campos Netto, J S; Souza Valle, L.B. de

    1987-02-01

    The cardiac function by radiocargiogram before and after the oral administration of isossorbide dinitrate in 20 patients with congestive heart failure is studied, including the meantime of pulmonary circulation, the meantime of cardiac cycle, cardiac debit and the dejection fraction of left ventricle. (author).

  14. The renewable energy sources market: proposal for its development and implications in the Wholesale Market Administrator; O mercado de energia eletrica de fontes incentivadas: proposta para sua expansao e implicacoes na camara de comercializacao de energia eletrica

    Energy Technology Data Exchange (ETDEWEB)

    Januario, Alexandra Cristina Vidal

    2007-07-01

    This work approaches the insertion of the renewable energy sources - SHP, biomass, wind and solar - in the Brazilian power trading environment, more specifically in wholesale market administrator. Although the legislation created the special consumer in 1998, the lack of definition in the renewable energy trading process hindered this market development during years. However, to consider a solution for this implementation, it is important to know the current rules that conduct the power trading, therefore, identifying the possibilities of adjustment. Since this is a current subject, some proposals had been presented by sector agents through the Public Hearing 33/05. In this work, these proposals are also analyzed, so the presented solution considers the advantages and disadvantages of what was discussed by the market agents. Finally, the simulation of the proposed solution indicates its implementation viability and allows a critical analysis of the renewable energy sources market and the trading rules of the wholesale market administrator. (author)

  15. Improvement of the performance of a new type of single chamber microbial fuel cell compared to a conventional cell; Mejora del desempeno de un nuevo tipo de celda de combustible microbiana de una camara comparado con una celda convencional

    Energy Technology Data Exchange (ETDEWEB)

    Vazquez Larios, A.L.; Vazquez-Huerta, G.; Esparza-Garcia, F.; Solorza-Feria, O.; Poggi Varaldo, H.M. [Centro de Investigacion y de Estudios Avanzados del IPN, Mexico D.F. (Mexico)]. E-mail: hectorpoggi2001@gmail.com; linevazquez@yahoo.com.mx

    2009-09-15

    The objective of this work was to design, build and operate a new type of microbial fuel cell (MFC-A) and evaluate the architectural changes in the production of electricity. The results were compared with those of a standard fuel cell (MFC-B). The MFC-A consisted of a horizontal acrylate cylinder with two systems of sandwiched electrodes (each with a anode proton exchange membrane-cathode) separated by 78 mm. The MFC-B consisted of an anode and a cathode each in the opposite faces of the cell. The internal resistance of the cells were determined with polarization curves. The cells were operated in batch during 50 h at 30 degrees Celsius obtained with 38 mW/m{sup 2} and 5 mW/m{sup 2} for MFC-A and MFC-B, respectively. The changes in the architecture of the cell and design of the electrodes occurred at a power density 8 times greater, associated with the decrease in internal resistance of 1200 and 3900 {Omega} for MFC-A and MFC-B, respectively. The change in architecture (double electrode in the same volume for MFC-A) enabled obtaining a 13 times greater potential per unit volume, with 922 mW/m{sup 3} in the new MFC-A cell versus 69 mW/m{sup 3} in MFC-B. [Spanish] El objetivo de este trabajo fue disenar, construir y operar una celda de combustible microbiana de nuevo tipo (CCM-A), y evaluar los cambios de arquitectura en la produccion de electricidad. Los resultados fueron comparados con los de una celda de combustible estandar (CCM-B). La CCM-A consistio de un cilindro horizontal de acrilato, con dos sistemas de electrodos emparedados (cada uno con catodo/membrana de intercambio protonico/anodo) separados por 78 mm. La CCM-B consistio de un anodo y un catodo cada uno en las caras opuestas de la celda. Las Ri de las celdas fueron determinadas por curva de polarizacion. Las celdas fueron operadas en lote durante 50 h, a 30 grados centigrados, y fueron inoculadas con un inoculo sulfato reductor (In-SR) y cargadas con un extracto modelo similar al perfil de metabolitos, generados en la produccion biologica de hidrogeno a partir de residuos solidos municipales. La densidad de potencia maxima a 30 grados centigrados obtenida fue 38 mW/m{sup 2} y 5 mW/m{sup 2} para la CCM-A y CCM-B respectivamente. Los cambios en la arquitectura de la celda y el diseno de los electrodos dieron lugar a una densidad de potencia ocho veces mayor, asociado a la disminucion de la resistencia interna (Ri), de 1200 y 3900 {Omega} para CCM-A y CCM-B, respectivamente. El cambio de arquitectura (doble electrodo en el mismo volumen para CCM-A) permitio obtener potencias por unidad de volumen 13 veces superior, siendo 922 mW/m{sup 3} en la nueva celda CCM-A, contra 69 mW/m{sup 3} en CCM-B.

  16. Regression models in the determination of the absorbed dose with extrapolation chamber for ophthalmological applicators; Modelos de regresion en la determinacion de la dosis absorbida con camara de extrapolacion para aplicadores oftalmologicos

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez R, J T; Morales P, R

    1992-06-15

    The absorbed dose for equivalent soft tissue is determined,it is imparted by ophthalmologic applicators, ({sup 90} Sr/{sup 90} Y, 1850 MBq) using an extrapolation chamber of variable electrodes; when estimating the slope of the extrapolation curve using a simple lineal regression model is observed that the dose values are underestimated from 17.7 percent up to a 20.4 percent in relation to the estimate of this dose by means of a regression model polynomial two grade, at the same time are observed an improvement in the standard error for the quadratic model until in 50%. Finally the global uncertainty of the dose is presented, taking into account the reproducibility of the experimental arrangement. As conclusion it can infers that in experimental arrangements where the source is to contact with the extrapolation chamber, it was recommended to substitute the lineal regression model by the quadratic regression model, in the determination of the slope of the extrapolation curve, for more exact and accurate measurements of the absorbed dose. (Author)

  17. Performance Analysis of a Bunch and Track Identifier Prototype (BTI) for the CMS Barrel Muon Drift Chambers; Estudio de las Prestaciones de un Prototipo de Bunch and Track Identifier (BTI) para las Camaras de Deriva de CMS

    Energy Technology Data Exchange (ETDEWEB)

    Puerta Pelayo, J.

    2001-07-01

    This note contains a short description of the first step in the first level trigger applied to the barrel muon drift chambers of CMS: the Bunch and Track Identifier (BTI). The test beam results obtained with a BTI prototype have been also analysed BTI performance for different incidence angles and in presence of external magnetic field has been tested, as well as BTI capability as trigger device and track reconstructor. (Author) 30 refs.

  18. Design and construction of an interface system for the extrapolation chamber from the beta secondary standard.; Diseno y construccion del sistema de interfaz para la camara de extrapolacion del patron secundario beta.

    Energy Technology Data Exchange (ETDEWEB)

    Jimenez C, L F

    1995-10-01

    The Interface System for the Extrapolation Chamber (SICE) contains several devices handled by a personal computer (PC), it is able to get the required data to calculate the absorbed dose due to Beta radiation. The main functions of the system are: (a) Measures the ionization current or charge stored in the extrapolation chamber. (b) Adjusts the distance between the plates of the extrapolation chamber automatically. (c) Adjust the bias voltage of the extrapolation chamber automatically. (d) Acquires the data of the temperature, atmospheric pressure, relative humidity of the environment and the voltage applied between the plates of the extrapolation chamber. (e) Calculates the effective area of the plates of the extrapolation chamber and the real distance between them. (f) Stores all the obtained information in hard disk or diskette. A comparison between the desired distance and the distance in the dial of the extrapolation chamber, show us that the resolution of the system is of 20 {mu}m. The voltage can be changed between -399.9 V and +399.9 V with an error of less the 3% with a resolution of 0.1 V. These uncertainties are between the accepted limits to be used in the determination of the absolute absorbed dose due to beta radiation. (Author).

  19. Q A IMRT comparison specific patient by means of radiochromic films, radiographic films and ionization chambers arrangement; Comparacion de QA IMRT paciente especifico mediante films radiocromicos, films radiograficos y arreglo de camaras de ionizacion

    Energy Technology Data Exchange (ETDEWEB)

    Medina, L.; Venencia, D.; Garrigo, E., E-mail: fisicamedina11@gmail.com [Instituto Privado de Radioterapia, Obispo Oro 423, X5000BFI Cordoba (Argentina)

    2014-08-15

    IMRT uses radiation beams of nonuniform intensity. Quality assurance (Q A) specific patient is mandatory in this treatment modality. The purpose of this study is to compare results of patient specific Q A IMRT dose distributions of the total plan and individual fields using different dosimetric systems. We used a photon beam 6 MV generated for linear accelerator PRIMUS, were used planning systems iPLAN and Konrad for IMRT inverse planning with modality Step and Shoot. For plans total dose distributions were measured with radiographic films EDR2 and Radiochromic Film EBT3. For individual fields the dose distributions were measured with radiographic films X-Omat-V, Radiochromic Film EBT3 and PTW 2D-Array. We used a scanner VIDAR Dosimetry Pro Red and software Rit v6.1 for analysis, was used Gamma index [Γ] for comparison of measured and calculated dose recording the number of pixels with Γ> 1. We analyzed 50 plan dose distributions total 50 individual fields. For the total plan the number of pixels with Γ>1 (3%-3m m) was 0.7%±1.2 [0.1%; 2.82%] for EBT3 y 1%±1.8 [0.2%; 3%] for EDR2. For individual fields (5%-3m m) was obtained 0.97%±1,7 [0%, 3%] for X-Omat-V, 0.84%±1.1[0.3%,3.1%] for EBT3 and 2.6%±1.9 [0.01%,6.8%] PTW 2D-Array. All three methods can be used. Radiochromic Films revealed the advantage and disadvantage of the cost. Both systems are slightly better film to PTW 2D-Array. (author)

  20. Experimental comparison of profiles of acquired small fields with ionization chambers, diodes, radiochromic s and TLD films; Comparacion experimental de perfiles de campos pequenos adquiridos con camaras de ionizacion, diodos, peliculas radiocromicas y TLD

    Energy Technology Data Exchange (ETDEWEB)

    Venencia, D.; Garrigo, E. [Instituto Privado de Radioterapia, Obispo Oro 423, X5000BFI Cordoba (Argentina); Filipuzzi, M. [Instituto Balseiro, Centro Atomico Bariloche, Av. Bustillo 9500, 8400 Bariloche - Rio Negro (Argentina); Germanier, A., E-mail: devenencia@radioncologia-zunino.org [Centro de Excelencia en Productos y Procesos, Santa Maria de Punilla, 5164 Cordoba (Argentina)

    2014-08-15

    The use of radiation small fields, introduced by new techniques, can bring a considerable uncertainty in the precision of the acquired profiles, due to the conditions of lateral electronic non-equilibrium and the perturbations introduced by the detectors (volume effect and alteration of the charged particles flowing) [Das et al., 2007]. The development of new miniature detectors looks to diminish the uncertainty created by the material and the size of the sensitive volume of the dosimeter. For this reason, comparative measurements for three sizes of square field were carried out (20 mm, 10 mm and 5 mm, of side) using a detectors series: 3 ionization chambers (PTW-31003, IBA-CC04, PTW-31016), 2 diodes (PTW-60012, IBA-Sfd), thermoluminescent detectors micro-cubes of 1 mm of edge (TLD-700) and radiochromic s films EBT-3. These last two were used as reference detectors, due to their spatial high resolution and similar performance with Monte Carlo simulations [Francescon et al., 1998]. So much the thermoluminescent detectors as the radiochromic films resolved the profiles in a similar way. Both diodes responded correctly, but the rest of the detectors overestimated the gloom of the fields, which allows conclude that the used TLD (and both diodes) can resolve field sizes correctly, usually utilized in radio-surgery, without producing significant alterations in the acquired data. (author)

  1. Impacts of the Shine Through neutrals on the Vacuum Vessel of TJ-II during NBI; Impactos de los Neutros de Shine Through en la Camara de Vacio del TJ-II durante NBI

    Energy Technology Data Exchange (ETDEWEB)

    Guasp, J.; Liniers, M.

    1995-07-01

    A numerical analysis of the impact patterns on the Vacuum Vessel produced by Shine Through neutrals during the tangential balanced NBI in TJ-II Helical Axis Stellarator has been done. The results show two main concentrations. The first one the circular part of the Hard Core, near the zone of closest approach of the beam. The second one, the most important, around the beam exit, on the border between the plate of the HC cover and the sector wall. As expected, the Shine Through loads decrease strongly with plasma density, predominating at low density at NBI start, decreasing quickly when density increases and increasing slightly with the beam energy. No overlapping with lost fast ions impacts is observed, that, in addition, show an opposite behaviour with density. (Author) 3 refs.

  2. Monitoring of the internal contamination of occupationally exposure personnel in services of nuclear medicine through the use of gamma cameras; Monitoreo de la contaminacion interna de personal ocupacionalmente expuesto en servicios de medicina nuclear mediante el uso de gamma camaras

    Energy Technology Data Exchange (ETDEWEB)

    Teran, M.; Paolino, A.; Savio, E. [Catedra de Radioquimica, Facultad de Quimica, Montevideo (Uruguay); Hermida, J.C. [Centro de Medicina Nuclear, Hospital de Clinicas, Facultad de Medicina, Montevideo (Uruguay); Dantas, B.M. [Laboratorio de Medidas In vivo, Instituto da Radioprotecao e Dosimetria, Rio de Janeiro (Brazil)

    2006-07-01

    The radionuclides incorporation can happen as a result of diverse activities; these include the work associated with the different stadiums of the nuclear fuel cycle, the use of radioactive sources in medicine, the scientific research, the agriculture and the industry. In Uruguay the main activities linked to the manipulation of open sources correspond those of Nuclear Medicine and from 2004, in the mark of the Project Arcal RLA 049 and being based on the Safety Guides of the IAEA it is implementing a program of internal monitoring in combined form the Nuclear Medicine Center of the Hospital of and the Radiochemistry class of the Faculty of Chemistry. In accordance with the publication of the ICRP 75 the emphasis of any monitoring program should be in the formal study of the doses in the workers to who are considered commendable of to receive in routine form an outstanding fraction of the dose limits or who work in areas where the exposures can be significant in the accident event. From April 2004, to the date has started a pilot plan by means of in that were established appropriate conditions of procedures and of safety in a reduced group of workers of the Nuclear Medicine area. In that period the first work limits, equipment adjustment, calibrations and registration systems were determined. The monitoring system implemented until the moment is carried out with a thyroid caption equipment. However these measurements are carried out in the university hospital embracing 40% of the involved workers of our country, with the purpose of reaching the covering of the biggest quantity of occupationally exposed personnel of private clinics. Also it was developed a new work proposal that allows to have an alternative measure method, in the event of not having the equipment habitually used. Among the conclusions of this work are that for the before exposed are considered the measure conditions but appropriate the following ones: Gamma Camera without collimator; Measurement time: 15 minutes; Detector- source distance: 20 cm. Under the determined conditions is possible to maintain the monitoring service of workers using gamma cameras like alternative method before the lack of an equipment of thyroid caption, allowing a work continuity without stopping the monitoring and the possibility opens up of implementing this methodology in nuclear medicine clinics far from the university center. (Author)

  3. Relative dosimetry of photon beam of 6 MV with a liquid ionization chamber; Dosimetria relativa de un haz de fotones de 6 MV con una camara de ionizacion liquida

    Energy Technology Data Exchange (ETDEWEB)

    Benitez Villegas, E. M.; Casado Villalon, F. J.; Martin-Cueto, J. A.; Caudepon Moreno, F.; Garcia Pareja, S.; Galan Montenegro, P.

    2011-07-01

    The increasing use of reduced size fields in the special techniques of treatment generates regions with high dose gradients. It therefore requires the use of detectors that present high spatial resolution. The aim of this study is to compare the dosimetric measurements obtained with a liquid ionization chamber PTW MicroLion recently acquired with other commonly used detectors for a photon beam of 6 MV linear electron accelerator Varian 600DBX.

  4. Design and fabrication of a chamber for the deposit of thin films by laser ablation; Diseno y fabricacion de una camara para el deposito de peliculas delgadas por ablacion laser

    Energy Technology Data Exchange (ETDEWEB)

    Chirino O, S.; Escobar A, I.; Camps C, E.; Garcia E, J.I. [Departamento de Fisica, ININ, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    2000-07-01

    The laser ablation technique is an alternative for the obtention of thin films which is less expensive, more reliable, efficient and with some advantages with respect to conventional processes. On of the most important components which forms a laser ablation system is the vacuum chamber, that has as general purposes the following: a) To carry out studies about plasma such as optical emission spectroscopy and measurements by deflectometry. b) To carry out an In situ monitoring about the film growth through the reflectivity measurements of the combination substrate-film. c) To deposit thin films of different materials such as oxides, carbon, metals, etc. In this work it is showed how the vacuum chamber was designed and made to perform the store of thin films by laser ablation and for characterising the formed plasma as a result of the ablation process. The chamber design was enough versatile that will allow to add it more accessory just making it simple modifications. Its cost was very cheap more or less one twentieth of a commercial chamber. (Author)

  5. Use of calibration methodology of gamma cameras for the workers surveillance using a thyroid simulator; Uso de una metodologia de calibracion de camaras gamma para la vigilancia de trabajadores usando un simulador de tiroides

    Energy Technology Data Exchange (ETDEWEB)

    Alfaro, M.; Molina, G.; Vazquez, R.; Garcia, O., E-mail: mercedes.alfaro@inin.gob.m [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico)

    2010-09-15

    In Mexico there are a significant number of nuclear medicine centers in operation. For what the accidents risk related to the transport and manipulation of open sources used in nuclear medicine can exist. The National Institute of Nuclear Research (ININ) has as objective to establish a simple and feasible methodology for the workers surveillance related with the field of the nuclear medicine. This radiological surveillance can also be applied to the public in the event of a radiological accident. To achieve this it intends to use the available equipment s in the nuclear medicine centers, together with the neck-thyroid simulators elaborated by the ININ to calibrate the gamma cameras. The gamma cameras have among their component elements that conform spectrometric systems like the employees in the evaluation of the internal incorporation for direct measurements, reason why, besides their use for diagnostic for image, they can be calibrated with anthropomorphic simulators and also with punctual sources for the quantification of the radionuclides activity distributed homogeneously in the human body, or located in specific organs. Inside the project IAEA-ARCAL-RLA/9/049-LXXVIII -Procedures harmonization of internal dosimetry- where 9 countries intervened (Argentina, Brazil, Colombia, Cuba, Chile, Mexico, Peru, Uruguay and Spain). It was developed a protocol of cameras gamma calibration for the determination in vivo of radionuclides. The protocol is the base to establish and integrated network in Latin America to attend in response to emergencies, using nuclear medicine centers of public hospitals of the region. The objective is to achieve the appropriate radiological protection of the workers, essential for the sure and acceptable radiation use, the radioactive materials and the nuclear energy. (Author)

  6. Automatic control system for measuring currents produced by ionization chambers; Automatizacao de um sistema de medidas de correntes produzidas por camaras de ionizacao e aplicacao na calibracao do {sup 18}F e {sup 153}Sm

    Energy Technology Data Exchange (ETDEWEB)

    Brancaccio, Franco

    2002-07-01

    Ionization Chambers in current mode operation are usually used in Nuclear Metrology. Activity measurements are quickly performed by Ionization Chambers, with very good precision. For this purpose measurements of very low ionization currents, carried out by high quality instrumentation, are required. Usually, electrometers perform the current integration method under command of signals from an automation system, in order to reduce the measurement uncertainties. Among the measurement systems at the Laboratorio de Metrologia Nuclear (LMN) of IPEN, there are two ionization chamber systems. In the present work, an automation system developed for current integration measurements is described. This automation system is composed by software (graphic interface and control) and an electronic module connected to a microcomputer, by means of a commercial data acquisition card. Several test measurements were performed in order to determine the intrinsic uncertainty, linearity and stability of the system. Using calibrated radioactive solutions, the IG12/A20 chamber calibration factors for {sup 18}F and {sup 153}Sm were obtained, making possible to determine activities of these radionuclides. (author)

  7. Avaliação da degradação das soluções de processamento Kodak e Sillib, prontas para uso, utilizando recipientes de plastico e vidro, protegidos e desprotegidos, em camaras escuras portateis

    OpenAIRE

    Eroaldo dos Santos

    1996-01-01

    Resumo: O presente estudo teve por finalidade avaliar a degradação das soluções processadoras, revelador e fixador, das marcas Sillib e Kodak; prontas para uso, com filmes Kodak Ektaspeed (EP-21), em câmara escura portátil. As condições de experimentação foram: em recipientes de plástico (preto opaco) e em recipientes de vidro (incolor), protegidos e desprotegidos (com e sem tampa), simulando as condições de execução em consultórios odontológicos. As análises por densidade óptica das radiogra...

  8. Use of two-dimensional chamber arrays in volumetric modulated arc therapy treatment verification; Empleo de matrices bidimensionales de camaras de ionizacion en la verificacion de tratamientos de arcoterapia volumetrica modulada

    Energy Technology Data Exchange (ETDEWEB)

    Clemente Gutierrez, F.; Perez Vara, C.; Prieto Villacorta, M.; Fernandez Ruiz, M. L.; Ruiz Prados, M.

    2013-09-01

    Volumetric modulated arc therapy (VMAT) requires, as another kind of intensity-modulated radiation therapy (IMRT), patient-specific QA procedures. This work analyzes the method carried out in our institution for VMAT treatment verification. Our hypothesis is that traditional IMRT QA is valid for VMAT technique. Results obtained for absolute point-dose measurements with ion chamber are presented, as well as comparison with treatment planning system calculations (mean difference of (-0.50 {+-} 0.43)%). In addition, different setups with 2D ion chamber array for dose distributions comparison are analyzed. These detectors are the basis of our QA procedure. Advantages and disadvantages of those setups are shown. The present study includes results for 111 patients treated with VMAT technique from different disease sites. We conclude that 2D ion chamber arrays traditionally used in IMRT QA are valid detectors for rotational techniques if these arrays are used together with additional devices (phantoms, accessories) that allow us to obtain as much information as possible. (Author)

  9. General description and first results with the ORIS-LMRI 4 {pi} {gamma} metering chamber; Descripcion general y primeros resultados con la camara 4 {pi} {gamma} metrologica ORIS-LMRI

    Energy Technology Data Exchange (ETDEWEB)

    Tejera R, A; Becerril V, A; Cortes P, A

    1990-04-15

    A problem that present the ionization chambers is that the response for the radiation is global, that is to say that it cannot discriminate against selectively the relating responses at different energies, if these impact simultaneously in the active volume. This is a reason to calibrate the chambers, if is possible, with gamma monoenergetic emitting and by average calculations to complete the response curve with gamma emitting of well-known yields. To obtain the calibration coefficients and may used them, it is necessary that so much the standardized radioisotopes as the solutions by calibrating, are contained in vessels with the same geometry and the same quantity. In the exposed case, pattern solutions of 5 ml were used contained in glass cruets of 10 ml. The problem solutions are contained in same cruets to those of the patterns. The first results obtained with the ORIS-LMRI 4 {pi} {gamma} metering chamber are presented. (Author)

  10. Implementation of a laboratory for manufacture, repair and electric calibration of dosemeters based in ionization chambers utilized in radiotherapy; Implementacao de um laboratorio para manutencao, reparo e calibracao eletrica de dosimetros baseados em camaras de ionizacao, utilizados em radioterapia

    Energy Technology Data Exchange (ETDEWEB)

    Becker, P.H.B.; Peres, M.A.L.; Moreira, A.J.C.; Nette, H.P. [Instituto de Radioprotecao e Dosimetria. Av. Salvador Allende S/N. Barra de Tijuca CEP: 22780-160. Caixa Postal: 37750 Rio de Janeiro-RJ (Brazil)

    1998-12-31

    Manufacturers of ionization chamber dosimeters for radiotherapy maintain only sales representatives in Brazil with no servicing capability causing difficulties to customers/users to get broken equipment back into operation. Aiming to partially solve this problem, a laboratory for maintenance, repair and electrical calibration was started in 1995 with the support of a two year IAEA Technical Assistance Project (BRA/1/031). (Author)

  11. Establishment of a primary standard system for low energy X-rays using a free air ionization chamber; Estabelecimento de um sistema padrao primario para raios-X de energias baixas com uma camara de ionizacao de ar livre

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Natalia Fiorini da

    2016-08-01

    In this work a primary standard system was established for low energy X-rays (10 kV to 50 kV), using a free air ionization chamber with concentric cylinders, Victoreen (Model 481-5), at the Calibration Laboratory of Instruments (LCI) of the Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP). For this, a new ionization chamber alignment protocol was developed for the radiation system and a modification on the micrometer housing used for the movement of the internal cylinders was ma de. The results obtained for the stability and characterization tests showed to be within the limits established by the standards IEC 61674 and IEC 60731. The correction factors for photon attenuation in the air, transmission and scattering in the diaphragm, scattering and fluorescence and ion recombination were also determined. These values were compared with those obtained by the German primary standard laboratory, Physikalisch-Technische Bundesanstalt (PTB), showing good agreement. Finally, the absolute values of the quantity air kerma rate for the standard qualities direct beams MWV28 and WMV35 and the attenuated beams WMH28 and WMH35 were determined; the results are in agreement, with a maximum difference of 3,8% with the values obtained using the secondary standard system of LCI. (author)

  12. Determination of the air attenuation and electronic loss for the free air concentric cylinders ionization chamber; Determinacao da atenuacao do ar e perda eletronica para a camara de ionizacao de ar livre de cilindros concentricos

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Hebert Pinto Silveira de

    2010-07-01

    Along the latest years, the LNMRI has been proceeding a continuous research work with a concentric cylinders type free air ionizing chamber (VICTOREEN, model 481), aiming to establish it as a new national standard, and, as a consequence, replace the worldwide accepted secondary standard, calibrated by PTB. Taking into account that the absolute determination of kerma in air with a free air ionizing chamber implies the acquirement of a number of correction factors. The main objective of the present work comprises the determination of the two factors, specifically, electronic loss (k{sub e}) and air attenuation (k{sub a}). The correction factors were obtained through mammography qualities reference spectrum, using Monte Carlo simulation method. The Penelope code was used in the simulation procedures. Simulations took place in two stages, the acquirement of specters related to the qualities of interest (mammography) with the x ray tube (Pantak, model HF160 e Panalytical, model XRF window), and the free-air ionization chamber. The data were compared to those related to the BIPM chamber, to electronic loss were not detected. The comparison between air attenuation factors was obtained data bellow 0.13%. (author)

  13. Characterization of a free-air ionization chamber in direct X-ray beams as used in mammography; Caracterizacao de uma camara de ionizacao de ar-livre em feixes diretos de raios X utilizados em mamografia

    Energy Technology Data Exchange (ETDEWEB)

    Lima, Mateus Hilario de

    2014-08-01

    At this work stability and characterization tests were undertaken on a Victoreen free-air ionization chamber, model 481. The tests were realized using direct X-ray beams as a contribution for its establishment as a primary standard system of the quantity air kerma. The characterization tests were: saturation curve, ion collection efficiency, polarity effect, response linearity with the air kerma rate and response linearity with the chamber volume variation. The ion collection efficiency allowed the determination of the ion recombination factor. Most of the test results showed agreement with the limits established by international standards. Furthermore, the air attenuation factors for the mammography beams with aluminum and molybdenum filters were obtained. The factors for photon transmission and scattering at the diaphragm edges were also determined for mammography beams with aluminum filter and for the standard beam with molybdenum filter. (author)

  14. Ocean station data collected using bottle from the ALMIRANTE CAMARA and other platforms in the NE Atlantic (limit-40 W) and Others from 1983-01-02 to 1983-11-11 (NODC Accession 9000033)

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — Ocean station data were collected using seechi disk, meteorological sensors and bottle casts in the Northwest and Southwest Atlantic Ocean from 02 January 1983 to 11...

  15. Description of the XXXIV ARCAL Project {sup R}epairing and calibration of electrometers and ionization chambers used in radiotherapy; Descripcion del proyecto ARCAL XXXIV {sup R}eparacion y calibracion de electrometros y camaras de ionizacion utilizados en radioterapia

    Energy Technology Data Exchange (ETDEWEB)

    Cruz E, P.; Villaverde L, A. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    2002-07-01

    The technological tools from what the humanity has for the illnesses diagnosis and the cancer treatment, are based in great extent in the use of ionizing radiations. This situation worries to the International Atomic Energy Agency (IAEA), which has implemented technical cooperation programs for protecting the human health. In Latin America the ARCAL program (Regional Agreement of Cooperation for Promotion of Nuclear Science and Technology in Latina America and the Caribbean was created. The Project ARCAL XXXIV has as objective to establish three regional centers of repairing, maintenance and electric calibration of clinical dosemeters, equipment made up for an ionization chamber and an electrometer which is used in radiotherapy to generate calibration procedures, personnel training, establishment of an intercomparison net for the electrometers control used as standards and designing current intensity sources which serve as work standards for each one of the participant countries, Mexico is one of them. (Author)

  16. Impacts of lost fast ions on the TJ-II Vacuum Vessel during NBI; Impactos de los iones rapidos en la Camara de Vacio del TJ-II durante NBI

    Energy Technology Data Exchange (ETDEWEB)

    Guasp, J

    1995-07-01

    The possible deposition patterns, on the Vacuum Vessel, of lost fast ions during the balanced tangential NBI in TJ-II helical axis Stellarator are analysed theoretically, establishing the relation between those impact points, the plasma exit and birth positions and the magnetic configuration characteristics. It is shown that direct losses are the most important, mainly those produced by the beam injected with the same direction that the magnetic field, increasing with beam energy and plasma density but with impacts remaining fixed on well defined zones, a periodically distributed along the Hard Core cover plates, producing high loads at high densities. The remaining losses, except for the shine through ones that predominate at low density, are periodically distributed, with smooth maxima and produce very low loads. No overlapping between the different kind of losses or beams is observed. (Author) 6 refs.

  17. Intercomparison of ionization chambers in standard X-ray beams, at radiotherapy, diagnostic radiology and radioprotection levels; Intercomparacao de camaras de ionizacao em feixes padroes de raios X, niveis radioterapia, radiodiagnostico e radioprotecao

    Energy Technology Data Exchange (ETDEWEB)

    Bessa, Ana Carolina Moreira de

    2006-07-01

    Since the calibration of radiation measurement instruments and the knowledge of their major characteristics are very important subjects, several different types of ionization chambers were intercompared in terms of their calibration coefficients and their energy dependence, in radiotherapy, diagnostic radiology and radioprotection standard beams. An intercomparison of radionuclide calibrators for nuclear medicine was performed, using three radionuclides: {sup 67}Ga, {sup 201}Tl and {sup 99m}Tc; the results obtained were all within the requirements of the national standard CNEN-NE-3.05. In order to complete the range of radiation qualities of the Calibration Laboratory of IPEN, standard radiation beam qualities, radiation protection and low energy radiation therapy levels, were established, according international recommendations. Three methodologies for the calibration of unsealed ionization chambers in X-ray beams were studied and compared. A set of Victoreen ionization chambers, specially designed for use in laboratorial intercomparisons, was submitted to characterization tests. The performance of these Victoreen ionization chambers showed that they are suitable for use in radioprotection beams, because the results obtained agree with international recommendations. However, these Victoreen ionization chambers can be used in radiotherapy and diagnostic radiology beams only with some considerations, since their performance in these beams, especially in relation to the energy dependence and stabilization time tests, did not agree with the international recommendations for dosimeters used in radiotherapy and diagnostic radiology beams. This work presents data on the performance of several types of ionization chambers in different X-ray beams, that may be useful for choosing the appropriate instrument for measurements in ionizing radiation beams. (author)

  18. Comparison of ionization chamber calibration for mimeographs in W/Mo and W/Al qualities; Comparacao de calibracoes de camaras de ionizacao para mamografia nas qualidades W/Mo and W/Al

    Energy Technology Data Exchange (ETDEWEB)

    Pereira, Lara; Macedo, Eric; Navarro, Marcus; Ferreira, Mario; Garcia, Igor; Pires, Evandro; Leite, Handerson; Navarro, Valeria, E-mail: larapereira@ifba.edu.br [Instituto Federal da Bahia (LABPROSAUD/IFBA), Salvador , BA (Brazil). Lab. de Produtos para Saude

    2016-07-01

    The calibration of ionization chambers for mammography laboratories seek to keep pace with technological advancement of manufacturers who have used new combinations anode/filter in mammography beyond the classic combinations of molybdenum and rhodium. This paper proposes to investigate the equivalence between calibrations of chambers different using the combinations W/Mo and W/Al at LABPROSAUD. The results showed a variation less than 1% on relationship between the calibration coefficients obtained in the evaluated combinations anode/filter for an uncertainty of 2.4%. The excellent performance of the chambers suggests a new possibility of calibration in the mammography quality at LABPROSAUD. (author)

  19. Analysis of the internal temperature of the combustion chamber of a compact system of co-generation; Analise das temperaturas internas da camara de combustao de um sistema compacto de co-geracao

    Energy Technology Data Exchange (ETDEWEB)

    Duarte, Joao B.F. [Universidade de Fortaleza (UNIFOR), CE (Brazil)], email: furlan@unifor.br; Couto, Heraldo S. [Instituto Nacional de Pesquisas Espaciais (INPE), Cachoeira Paulista, SP (Brazil)], email: heraldo@lcp.inpe.br; Holanda, Carlos A.M. de [Universidade Federal do Ceara (UFC), Fortaleza, CE (Brazil). Dept. de Engenharia Metalurgica e de Materiais], email: almir@metalmat.ufc.br

    2008-07-01

    Nowadays, the energy deficit represents one of the biggest governmental challenges, since there is still a great number of communities living in areas without electricity energy; and thus without access to electro-electronic equipment such as television, refrigerators, computers. The main focus of this work is to present the possibility of electricity energy generation in conjunction with the frozen or hot water production in for places without electricity transmission nets or even any type of alternative power plants. The system is based on the standard air cycle called Brayton cycle composed of a turbo-compressor model 4LGZ from BorgWarner, a combustion chamber, a power turbine, a heat exchanger, a water-ammonia chiller, a 5.0 kV A generator, and a command panel for automation and distribution of energy. This system that uses natural gas or LPG, will supply electric energy from the generator, hot water from the heat exchange with the gases of combustion, and water frozen from chiller using as the hot source the gases proceeding from the power system. The prototype is already being tested and the first results obtained are excellent. In this paper, we analyze the internal combustion chamber temperatures. (author)

  20. Characterization of an extrapolation chamber and radiochromic films for verifying the metrological coherence among beta radiation fields; Caracterizacao de uma camara de extrapolacao e filmes radiocromicos para verificacao da coerencia metrologica entre campos padroes de radiacao beta

    Energy Technology Data Exchange (ETDEWEB)

    Castillo, Jhonny Antonio Benavente

    2011-07-01

    The metrological coherence among standard systems is a requirement for assuring the reliability of dosimetric quantities measurements in ionizing radiation field. Scientific and technologic improvements happened in beta radiation metrology with the installment of the new beta secondary standard BSS2 in Brazil and with the adoption of the internationally recommended beta reference radiations. The Dosimeter Calibration Laboratory of the Development Center for Nuclear Technology (LCD/CDTN), in Belo Horizonte, implemented the BSS2 and methodologies are investigated for characterizing the beta radiation fields by determining the field homogeneity, the accuracy and uncertainties in the absorbed dose in air measurements. In this work, a methodology to be used for verifying the metrological coherence among beta radiation fields in standard systems was investigated; an extrapolation chamber and radiochromic films were used and measurements were done in terms of absorbed dose in air. The reliability of both the extrapolation chamber and the radiochromic film was confirmed and their calibrations were done in the LCD/CDTN in {sup 90}Sr/{sup 90}Y, {sup 85}Kr and {sup 147}Pm beta radiation fields. The angular coefficients of the extrapolation curves were determined with the chamber; the field mapping and homogeneity were obtained from dose profiles and isodose with the radiochromic films. A preliminary comparison between the LCD/CDTN and the Instrument Calibration Laboratory of the Nuclear and Energy Research Institute / Sao Paulo (LCI/IPEN) was carried out. Results with the extrapolation chamber measurements showed in terms of absorbed dose in air rates showed differences between both laboratories up to de -I % e 3%, for {sup 90}Sr/{sup 90}Y, {sup 85}Kr and {sup 147}Pm beta radiation fields, respectively. Results with the EBT radiochromic films for 0.1, 0.3 and 0.15 Gy absorbed dose in air, for the same beta radiation fields, showed differences up to 3%, -9% and -53%. The beta radiation field mappings with radiochromic films in both BSS2 showed that some of them were not geometrically aligned. (author)

  1. Project, construction and characterization of ionization chambers for use as standard systems in X and gamma radiation beams; Projeto, construcao e caracterizacao de camaras de ionizacao para utilizacao como sistemas padroes em feixes de radiacao X e gama

    Energy Technology Data Exchange (ETDEWEB)

    Perini, Ana Paula

    2013-07-01

    Ionization chambers present some advantages in relation to other dosimeters: easiness of handling, low energy dependence and high precision. The advantages associated to ionization chambers and the large number of diagnostic radiology exams and therapeutic treatments motivated the development of this PhD program. In this project ionization chambers were developed and characterized to be applied in diagnostic radiology and therapy beam dosimetry, with high precision and performance, in compliance with international recommendations. They were assembled in a simple way, utilizing low-cost national materials, so they can be reproduced and applied at calibration laboratories. The project of these ionization chambers presents some differences in relation to commercial ionization chambers, as the materials utilized and geometrical arrangements. Besides the development of the ionization chambers to be utilized in standard X-ray beam dosimetry as work standard systems, two graphite parallel-plate ionization chambers were developed and characterized to be applied as reference standard systems for determining the air kerma rates of gamma radiation sources. Comparing the air kerma rates determined with the reference standard of the Calibration Laboratory of IPEN, a Farmer ionization chamber, with the values of the air kerma rates obtained with the graphite ionization chambers, the maximum differences obtained were only 1.7% and 1.2% for the G1 and G2 graphite ionization chambers, respectively. Moreover, these ionization chambers presented correction factors close to 1.000, which is ideal for an ionization chamber be characterized as a reference standard system. (author)

  2. Ion chamber-electrometer measurement system for radiation protection tests in X-ray equipment for interventional procedures; Sistema de medicao camara de ionizacao-eletrometro para ensaios de protecao radiologica em equipamentos de raios X para procedimentos intervencionistas

    Energy Technology Data Exchange (ETDEWEB)

    Bottaro, Marcio

    2012-07-01

    A new parallel plate ionization chamber with volume of 500 cc and an electrometer with digital interface for data acquisition, configuring an ion chamber electrometer measurement system, were developed to comply with specific requirements for compulsory radiation protection tests in interventional X-ray equipment. The ion chamber has as main characteristics: low cost, mechanical strength and response variation with beam energy of less than 5% in the 40 kV to 150 kV range. The electrometer has a high gain (5x10{sup 8} V/A) transimpedance amplifier circuit and a data acquisition and control system developed in LabVIEW Registered-Sign platform, including an integrated power supply for the ion chamber bias with adjustable DC voltage output from O to 1000 V and an air density correction system. Electric field calculations, laboratory measurements in standard beams and computational simulations of radiation interactions in chamber volume with Monte Carlo Method were employed in the elaborated methodology of the ion chamber development, which was tested and validated. It was also developed a simplified methodology for electrometer calibration that assures metrological trustworthiness of the measurement system. Tests for the system performance evaluation as environmental influence response, energy response, angular dependency, linearity and air kerma and air kerma rate dependency were performed according to international standards and requirements. Additionally, for a detailed evaluation of the developed ion chamber, simulations with various scattered radiation spectra were performed. The system was applied in leakage radiation, residual radiation and scattered radiation tests, being compared with other reference systems and validated for laboratorial test routine. (author)

  3. Comparison between Electronic Portal Imaging Devices and ion chamber matrix for intensity-modulated radiotherapy quality assurance; Comparacao entre Dispositivos Eletronicos de Imagens Portais e matriz de camaras de ionizacao para garantia da qualidade de radioterapia de intensidade modulada

    Energy Technology Data Exchange (ETDEWEB)

    Silveira, Thiago B.; Rosa, Luiz A.R., E-mail: thiago.fisimed@gmail.com [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil); Lima, Marilia B., E-mail: thiago.fisimed@gmail.com [Instituto Nacional do Cancer (INCA), Rio de Janeiro, RJ (Brazil). Departamento de Fisica Medica

    2012-08-15

    The treatment with intensity-modulated radiotherapy (IMRT) demands an individual and specific quality assurance procedure. The use of ion chamber matrix is a well establish method to dose distribution verifications, despite the lower spatial resolution. An alternative method arising is the use of the Electronic Portal Imaging Devices (EPIDs). The aim of this paper is to validate the EPID use for quality assurance of IMRT comparing it to the previous method employing an ion chamber matrix. We analyzed 10 treatment planning for different tumor sites and photons energies of the linac Trilogy (Varian Medical Systems). We used Sliding-window IMRT and the measurements were acquired in EPID and in Physikalisch-Technische Werkstaetten (PTW) 2D Array seven29. Two different software were used to analyze the data: Verisoft version 4.0, for Array data; and Eclipse 8.6 with Portal Dosimetry for EPID data. The evaluation of concordance levels between measured and predicted images used the Gamma Index tool with 3% of dose difference and 3 mm of distance to agreement. The EPID showed worse results for approval percentiles, in average 2.17%, and bigger values of average gamma index, although its analysis confirmed the approvals of all planning. This happens because of the better sensitivity generated by the higher spatial resolution of the EPID, 0,784 mm against 1,0 cm of the Array, so it has bigger capacity to identify small dose variations. The EPID, jointly with the Portal Dosimetry, proved to be excellent tools to perform pre-treatment IMRT verifications, providing significant gain in dose distribution analysis. Also, the EPID is easier for positioning, for images manipulation, for data acquisition and analysis and has detection area 60% bigger. (author)

  4. AP Potential™ Expectancy Tables Based on PSAT/NMSQT® and SAT® Scores on the 2015-16 Redesigned Scales. Statistical Report 2016-2

    Science.gov (United States)

    Ewing, Maureen; Wyatt, Jeffrey N.; Smith, Kara

    2016-01-01

    Historically, AP Potential™ has used PSAT/NMSQT® scores to identify students who are likely to earn a 3 or higher on a specific AP® Exam--based on research showing moderate to strong relationships between PSAT/NMSQT scores and AP Exam scores (Camara & Millsap, 1998; Ewing, Camara & Millsap, 2006; Zhang, Patel & Ewing, 2014a). For most…

  5. AP Potential Expectancy Tables Based on PSAT/NMSQT and SAT Scores on the 2015-16 Redesigned Scales Using Final Concordance Tables. Statistical Report

    Science.gov (United States)

    Ewing, Maureen; Wyatt, Jeff

    2017-01-01

    Historically, AP Potential™ has used PSAT/NMSQT® scores to identify students who are likely to earn a 3 or higher on a specific AP Exam based on research showing moderate to strong relationships between PSAT/NMSQT scores and AP Exam scores (Camara & Millsap, 1998; Ewing, Camara, & Millsap, 2006; Zhang, Patel, & Ewing, 2014a). For most…

  6. Assessing the utility of the spot 6 sensor in detecting and mapping ...

    African Journals Online (AJOL)

    Lantana camara is a significant weed in South Africa which is causing severe impacts on agriculture by reducing grazing areas. This study assessed the potential of the SPOT 6 multispectral sensor and two broadband vegetation indices (NDVI and SR) for detecting and mapping Lantana camara in a community grazing ...

  7. Incorporating Ninth-Grade PSAT/NMSQT® Scores into AP Potential™ Predictions for AP® European History and AP World History. Statistical Report 2014-1

    Science.gov (United States)

    Zhang, Xiuyuan; Patel, Priyank; Ewing, Maureen

    2015-01-01

    Historically, AP Potential™ correlations and expectancy tables have been based on 10th-and 11th-grade PSAT/NMSQT® examinees and 11th-and 12th-grade AP® examinees for all subjects (Zhang, Patel, & Ewing,2014; Ewing, Camara, & Millsap, 2006; Camara & Millsap, 1998). However, a large number of students take AP European History and AP…

  8. Revascularización pulpar mediante la utilización de plasma rico en plaquetas autólogo o en combinación con una matriz colágena, como posibilidades terapéuticas para dientes con ápice abierto, pulpa necrótica y/o patología periapical.

    Directory of Open Access Journals (Sweden)

    Paula Alejandra Camargo Guevara

    2014-07-01

    Full Text Available Objetivo: describir el uso del plasma rico en plaquetas autólogo o en combinación con una matriz colágena como posibilidades terapéuticas de revascularización en dientes con ápices abiertos, pulpa necrótica y/o lesión periapical. Métodos: se realizó una búsqueda temática de la literatura entre los años 2007 y 2013, por medios electrónicos, bases de datos, revistas y journals con alto impacto en endodoncia. Resultados: la endodoncia regenerativa es un procedimiento biológico diseñado para reemplazar estructuras lesionadas, enfermas o ausentes del complejo pulpo-dentinal. Hay tres factores que guían y permiten la regeneración tisular: células madre mesenquimales (MSC, que pueden diferenciarse y apoyar la continuación en el desarrollo radicular, factores de crecimiento (GF, para la inducción de la proliferación celular y la diferenciación, y un andamio adecuado que brinde soporte y promueva la migración, crecimiento y la diferenciación celular. El colágeno y el plasma rico en plaquetas (PRP han sido reportados como andamios de elección en la regeneración endodóntica, se dice que estimulan la formación de tejido, la organización y la adherencia celular, mejorando el tiempo de tratamiento y de evolución. Conclusiones: en los procedimientos de revascularización, elegir un andamio o soporte tridimensional como el colágeno tipo I o PRP sumado a la inducción de los tejidos periapicales, aumenta las posibilidades de éxito en el tratamiento de regeneraciónendodóntica gracias a las propiedades que brindan y a la interacción molecular.

  9. Estimation of maximum pressure in small containments of PWR reactors due to loss of coolant accident in primary circuit; Estimativa da pressao maxima em contencoes de reatores PWR de pequeno porte devido a um acidente de perda de refrigerante no circuito primario

    Energy Technology Data Exchange (ETDEWEB)

    Mendes Neto, Teofilo [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil); Moreira, Joao Manoel Losada [Centro Tecnologico da Marinha em Sao Paulo (CTMSP), SP (Brazil)

    2000-07-01

    This work studies the problem of containment pressurization after a LOCA in reactors with small containment free volumes. The relationship between the reactor power and the containment free volume is described with the ratio between the volumes of the primary circuit and of the containment. The maximum pressure in a containment, following a LOCA, obtained after a correlation based on large containment PWR, is around 185 psia for a primary circuit and containment volumes ratio of 0.025. For the same problem, calculations with the CONTEMPT-LT code produced a maximum pressure of 162 psia. The behavior of the temperature after a LOCA to the containment, as a function of the ratio between the primary circuit and containment volume, is such that it increases reaching asymptotically to a maximum; differently, the pressure increases almost linearly with the ratio of volumes. (author)

  10. Pseudoinfarto agudo do miocárdio devido à síndrome da disfunção ventricular apical transitória (síndrome de Takotsubo Pseudo-acute myocardial infarction due to transient apical ventricular dysfunction syndrome (Takotsubo syndrome

    Directory of Open Access Journals (Sweden)

    Bruno Araújo Maciel

    2013-03-01

    Full Text Available A síndrome de Takotsubo caracteriza-se por disfunção ventricular esquerda transitória, predominantemente medioapical, desencadeada caracteristicamente por estresse físico ou emocional. Relata-se aqui o caso de uma paciente de 61 anos de idade, admitida com tontura, sudorese profusa e mal-estar súbito, após intenso estresse emocional. Exame físico e eletrocardiograma inicial foram normais, porém havia elevação de troponina I e CKMB massa. Suspeitou-se de infarto agudo do miocárdio sem supradesnivelamento do segmento ST, indicando cineangiocoronariografia de urgência. Foram evidenciados ventrículo esquerdo com hipocinesia difusa grave, balonamento sistólico medioapical e coronárias sem lesões significativas. A paciente foi encaminhada aos cuidados intensivos, evoluindo satisfatoriamente com terapia de suporte. Conforme visto, a cardiomiopatia de Takotsubo pode simular infarto agudo do miocárdio, sendo a cineangiocoronariografia importante para distinção na fase aguda. Neste caso, a paciente evoluiu com resolução espontânea da disfunção ventricular, sem sequelas.Takotsubo syndrome is characterized by predominantly medial-apical transient left ventricular dysfunction, which is typically triggered by physical or emotional stress. The present article reports the case of a 61-year-old female patient presenting with dizziness, excessive sweating, and sudden state of ill feeling following an episode involving intense emotional stress. The physical examination and electrocardiogram were normal upon admission, but the troponin I and creatine kinase-MB concentrations were increased. Acute myocardial infarction without ST segment elevation was suspected, and coronary angiography was immediately performed, which showed severe diffuse left ventricular hypokinesia, medial-apical systolic ballooning, and a lack of significant coronary injury. The patient was referred to the intensive care unit and was successfully treated with supportive therapy. As this case shows, Takotsubo syndrome might simulate the clinical manifestations of acute myocardial infarction, and coronary angiography is necessary to distinguish between both myocardial infarction and myocardial infarction in the acute stage. The present patient progressed with spontaneous resolution of the ventricular dysfunction without any sequelae.

  11. Neutron stimulated emission computed tomography applied to the assessment of calcium deposition due to the presence of microcalcifications associated with breast cancer; Tomografia computadorizada de emissao estimulada por neutrons aplicada para avaliar a deposicao de calcio devido a presenca de microcalcificacoes associadas ao cancer de mama

    Energy Technology Data Exchange (ETDEWEB)

    Viana, Rodrigo S.S.; Yoriyaz, Helio [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, (SP) (Brazil)

    2011-07-01

    In this paper we presented an application of the Neutron Stimulated Emission Computed Tomography (NSECT), which uses a thin beam of fast neutrons to stimulate stable nuclei in a sample, emitting characteristic gamma radiation. The photon energy is unique and it is used to identify the emitting nuclei. This technique was applied for evaluating the calcium isotopic composition changing due to the development of breast microcalcifications. A particular situation was simulated in which clustered microcalcifications were modeled with diameters less than 1.40 mm. In this case, neutron beam breast spectroscopy was successful in detecting the counting changes in the photon emission spectra for energies, which are characteristics of 4{sup 0C}a isotope in a low deposited dose rate. (author)

  12. Mudança na dieta da traíra Hoplias malabaricus (Bloch (Erythrinidae, Characiformes em lagoas da bacia do rio Doce devido à introdução de peixes piscívoros Diet changes of the trahira Hoplias malabaricus (Bloch (Erythrinidae, Characiformes due to piscivorous introductions in Rio Doce valley lakes

    Directory of Open Access Journals (Sweden)

    Paulo dos Santos Pompeu

    2001-12-01

    Full Text Available Two piscivorous fishes, peacock bass (Cichla monoculus Spix & Agassiz, 1831 (Perciformes and piranha (Pygocentrus nattereri Kner, 1860 (Characiformes, were introduced in some Rio Doce valley lakes (19º50'S, 42º40'W for sport fisheries enhancement. As a consequence, small individuals and species were practically vanished in the host lakes. In this study, the effects of peacock bass and piranha introductions on the diet of a native piscivorous fish, the trahira - Hoplias malabaricus (Bloch, 1794 are presented. Trahira's diet from three lakes were was compared with the stomach contentsdiet of trahira's living in another between three lakes with and three withoutstocked with the piscivorous species peacock bass and piranha. In the lakes with introduced fishes species, the consumption of fish was significantly smaller and this food item have been this item partly replaced by aquatic invertebrates. This shift on of trahira's diet to the low abundance of its original prey, is attributed to the small fishes. This diet plasticity adaptative capacity he diet plasticity detected for trahira might be allowing its maintenance in the lakes with peacock bass and piranha.

  13. Perdas na produção e qualidade do leite devido contagem de células somáticas no leite e estresse térmico de vacas da raça Holandesa em clima temperado

    Directory of Open Access Journals (Sweden)

    Agostinho Ludovico

    2015-10-01

    Full Text Available  O objetivo deste estudo foi avaliar a influencia da contagem de células somáticas (CCS no leite e o estresse térmico sobre a produção e composição do leite de vacas de um rebanho de produção comercial em região de clima temperado, durante o período de 2008 a 2012. Os dados do dia de controle leiteiro de 161±9 vacas Holandesas, totalizando 9650 ordenhas, foram fornecidos pela Associação Paranaense de Criadores de Bovinos da Raça Holandesa e analisados através de estatística descritiva, correlação, análise de variância e regressão. A produção média diária de leite foi de 31,78 kg/vaca, com diminuição de 29,31% quando o escore de contagem de células somáticas (ECS foi 9 e até 11% quando o Índice de Temperatura Equivalente (ITE foi 32 ou maior. Os teores de lactose decresceram a partir do ECS 0 até 9 e de gordura a partir de ECS 1 até 9, totalizando diminuição de 7,88 e 9,23%, respectivamente, quando o ECCS foi 9. Um efeito inverso foi observado em relação ao teor de proteína, o qual aumentou 3,6% com ECS 8, comparado com o ECS 0. A produção diária de sólidos totais iniciou perdas a partir do ECS 0 e totalizou perdas de 30,64% quando este foi 9. O aumento do ITE até 32 ou mais diminuiu a concentração de todos os componentes do leite, exceto de proteína, em valores de até 3,42% da concentração. Estes efeitos, somados a diminuição na produção diária de leite com este nível de ITE, totalizaram perdas de até 12,74% na produção de sólidos totais. Conclui-se que as perdas de produção e qualidade de leite com o aumento da CCS e ITE são significativas e podem justificar a adoção de medidas para prevenir infecções na glândula mamária e conforto de vacas leiteiras, mesmo em região de clima temperado.

  14. Determination of the equivalent doses due to the ingestion of radionuclides from the uranium and thorium series presents in drinking waters of the region of Santa Luzia, Paraiba state, Brazil; Determinacao das doses equivalentes devido a ingestao de radionuclideos das series do uranio e torio presentes em aguas de consumo do municipio de Santa Luzia, estado da Paraiba

    Energy Technology Data Exchange (ETDEWEB)

    Pastura, Valeria F. da S., E-mail: vpastura@cnen.gov.b [Comissao Nacional de Energia Nuclear (DRSN/CNEN), Rio de Janeiro, RJ (Brazil). Diretoria de Radioprotecao e Seguranca Nuclear. Coordenacao de Materias Primas e Minerais; Campos, Thomas F. da C.; Petta, Reinaldo A., E-mail: thomascampos@geologia.ufrn.b, E-mail: petta@geologia.ufrn.b [Universidade Federal do Rio Grande do Norte (LARANA/UFRN), Natal, RN (Brazil). Lab. de Radioatividade Natural

    2011-10-26

    This paper determined the original dose equivalents from radionuclides of uranium and thorium series in a drinking water of well which is supplied to the population of Santa Luzia, Paraiba state, Brazil. The collected waters are near to the mineralized phlegmatic bodies in rose quartz and amazonite feldspar. Radiometric measurements performed on the feldspar vein point out counting ratios surrounding 30000 cps and the analysis of collected samples of minerals presented tenors for the {sup 226}Ra and {sup 219}Pb varying from 0.50 to 2.30 Bq/sw. For determination of concentration of radionuclides U{sub Total}, {sup 226}Ra, {sup 228}Ra and {sup 219}Pb, found in the not desalinated, two methods were used, spectrophotometry with arsenazo and radiochemistry, both realized in the CNEN-LAPOC laboratories. For the calculation of dose equivalent it was taken into consideration the following parameters: the dose coefficients for incorporation by ingestion for public individuals with ages over 17 years (Norma CNEN-NN-3.01, Regulatory Position 3.01/011) and daily ingestion of 4 liters of water, which is over the recommended by the WHO of 2L/day - 1993. The obtained values were compared with the reference value for compromised dose equivalent established by WHO for evaluate the risk potential to the health of population, by ingestion. The radionuclide concentrations in the wells varies from 0.054 to 0.21 Bq/L, resulting dose equivalents of 3.94 x 10{sup -3} mSv/year and 0.17 mSv/year in the studied population

  15. Gochnatia polymorpha (Less. Cabrera (Asteraceae changes in leaf structure due to differences in light and edaphic conditions Gochnatia polymorpha (Less. Cabrera modifica sua estrutura foliar devido a diferenças na luminosidade e condições edáficas

    Directory of Open Access Journals (Sweden)

    Davi Rodrigo Rossatto

    2010-09-01

    Full Text Available Gochnatia polymorpha (Less. Cabrera is a widespread Asteraceae species found in different physiognomies of cerrado (Neotropical savanna and in forest formations of southeast Brazil. This study describes some leaf anatomy characteristics of this species and quantitatively evaluates them in relation to different environments, as well as under different light conditions. We found quantitative differences in all anatomical parameters analyzed. The results demonstrate that high leaf anatomy plasticity is an adaptive advantage that allows this species to occur in diverse cerrado conditions.Gochnatia polymorpha (Less. Cabrera é uma espécie de Asteraceae com ampla distribuição no bioma cerrado, sendo encontrada em diversas fisionomias florestais da região sudeste do Brasil. O presente estudo descreve alguns caracteres anatômicos foliares dessa espécie e os analisa quantitativamente em função de sua ocorrência nas formações florestais e também das diferenças de luminosidade. Foram encontradas diferenças quantitativas em todos os parâmetros anatômicos analisados. Os resultados demonstram que a alta plasticidade anatômica foliar nesta espécie pode ser considerada como uma vantagem adaptativa que a permite ocorrer em diversos ambientes do cerrado.

  16. Evaluation of pituitary and thyroid hormones in patients with subarachnoid hemorrhage due to ruptured intracranial aneurysm Avaliação dos hormônios hipofisários e tireoidianos em pacientes com hemorragia subaracnoidea devido a ruptura de aneurisma intracraniano

    Directory of Open Access Journals (Sweden)

    Paola Mangieri

    2003-03-01

    Full Text Available It is well known that the central nervous system (CNS influences the pituitary hormone secretions and that diseases of CNS are frequently associated with an altered endocrine function. The aim of this study has been the evaluation of the serum concentrations of the pituitary and thyroid hormones in a series of patients with subarachnoid hemorrhage due to a ruptured cerebral aneurysm. Thirty-five patients (23 females and 12 males, aged 51.9±13.3 years on the mean were admitted. They were evaluated to assess the clinical severity of the subarachnoid hemorrhage by Hunt & Hess scale: nine patients were in the grade I, 14 in the grade II, and 12 in the grade III. Blood samples were obtained between 8:00 and 9:00 a.m. and serum hormones were measured by commercial kits (IRMA or MEIA methods. Cortisol serum levels (normal range (NR = 5 to 18 µg/dL were increased in all the patients (mean ± standard deviation = 31.4±12.4 µg/dL. Mean prolactin levels (NR É bem conhecido que o sistema nervoso central (SNC influencia as secreções dos hormônios hipofisários e que doenças do SNC são frequentemene associadas com função endócrina alterada. O objetivo deste estudo foi avaliar as concentrações séricas dos hormônios hipofisários e tireoidianos em uma série de pacientes acometidos de hemorragia subaracnóidea devida a ruptura de aneurisma cerebral. Foram avaliados 35 pacientes (23 mulheres e 12 homens, com média de idade de 51,9±13,3 anos. Foram avaliados para a severidade da doença pela escala de Hunt & Hess: nove deles estavam no grau I, 14 no grau II e 12 no grau III. As amostras de sangue foram obtidas entre 8:00 e 9:00 horas e os hormônios foram medidos pelos métodos de IRMA ou de MEIA. Os níveis séricos de cortisol (valor normal (VN 5 a 18 µg/dl estavam aumentados em todos os pacientes (média±desvio padrão = 31,4±12,4 µg/dl. Os níveis de prolactina (VN <20 ng/ml foram de 18,6±17,1 ng/ml e cinco (14,2% tiveram níveis maiores do que o normal. Os níveis de FSH e LH foram normais de acordo com a idade e sexo: homens - FSH = 4,0±2,9 mUI/ml (VN =1 a 10,5 mUI/ml; LH = 6,1±6,3 mUI/ml (VN =2 a 12 mUI/ml; mulheres - pré-menopausa: FSH = 2,5±1,5 mUI/ml (VN =2,4 a 9,3 mUI/ml; LH 3,9±5,1 mUI/ml (VN =2 a 15 µUI/ml; pós-menopausa: FSH = 48,3±18,5 mUI/ml (valor normal =31 a 134 mUI/ml; LH = 29±13,8 mUI/ml (VN =16 a 64 mUI/ml. Os níveis de TSH foram 3,9±5,2 µUI/ml (VN =0,5 a 4,7 µUI/ml e cinco pacientes (14,2 % tiveram níveis maiores do que o normal. Os níveis de triiodotironina (T3 foram de 66,4±18,7 ng/dl (VN = 45 a 137 ng/dl e cinco pacientes (14,2% tiveram níveis menores do que o normal (33,8±9 ng/dl. Os níveis de tiroxina (T4 (VN= 4,5 a 12,5 µg/dl foram de 7,4±1,7 µg/dl e dois pacientes (5,6 % tiveram níveis menores do que o normal. Anticorpos antitireoglobulina e antimicrossomal não foram detectados. Conclusões: nas primeiras 24 horas seguindo o quadro ictal, as anormalidades observadas nas dosagens hormonais podem ser devidas ao estresse provocado pelo sangramento intracraniano; as alterações observadas nos hormônios tireoidianos sugerem que os pacientes com hemorragia subaracnoidea podem desenvolver a síndrome do doente eutireoideo.

  17. Prevalence and associated factors with alcohol use disorders among adults: a population-based study in southern Brazil Prevalência e fatores associados a transtornos devido ao uso de álcool em adultos: estudo populacional no sul do Brasil

    Directory of Open Access Journals (Sweden)

    Emilene Reisdorfer

    2012-09-01

    Full Text Available OBJECTIVES: The study aimed to describe the prevalence of alcohol use disorders in an adult population from Brazil and its association with demographic, socioeconomic, behavioral variables and health conditions. METHODS: A population-based cross-sectional survey was conducted with adults (20 to 59 years of a medium-sized city in Southern Brazil with a random sample of 1,720 individuals. Cluster sampling was done in two stages: census tract first and household second. Alcohol use disorders were measured using the Alcohol Use Disorders Identification Test (AUDIT and associations were tested with selected variables by Poisson Regression. Results of multivariate analysis were expressed as prevalence ratios. RESULTS: The prevalence of alcohol use disorders in the population was 18.4% (95% CI: 16.6% - 20.3%, higher among men (29.9% than in women (9.3%. The prevalence of abstinence was 30.6%; 6.8% of respondents had already caused problems to themselves or to others after drinking; and 10.3% reported that a relative, friend or doctor had already shown concern on their drinking. After multivariate analysis, an association with alcohol use disorders remained for: being male, age 20 to 29 years, being single, declaring to be light-skinned blacks and being an ex-smoker or current smoker. CONCLUSION: The prevalence of alcohol use disorders identified is high compared with other similar studies, with differences according to being male, age 20 to 29, skin color and tobacco use. These issues must be considered in formulating public health policies aimed at reducing problems related to alcohol use.OBJETIVOS: Descrever a prevalência de uso problemático de álcool na população adulta de uma cidade de médio porte do sul do Brasil e testar sua associação com variáveis demográficas, socioeconômicas, comportamentais e de condições de saúde. MÉTODOS: Foi realizado um estudo transversal de base populacional com adultos (20 a 59 anos de uma cidade de médio porte do sul do Brasil com amostra probabilística de 1.720 pessoas. Utilizou-se o processo de amostragem por conglomerados, em dois estágios, sendo o primeiro o setor censitário e o segundo o domicílio. O uso problemático de álcool foi mensurado por meio do Alcohol Use Disorder Identification Test (AUDIT e foram testadas as associações com variáveis selecionadas através da Regressão de Poisson. Os resultados das análises multivariáveis foram expressos como razão de prevalência. RESULTADOS: A prevalência de uso problemático de álcool na população foi de 18,4% (IC95%: 16,6% - 20,3%, sendo maior entre os homens (29,9% do que entre as mulheres (9,3%. A prevalência de abstenção foi de 30,6%. Verificou-se que 6,8% dos entrevistados já causaram problemas a si mesmos ou a outros após terem bebido e 10,3% referiram que algum parente, amigo ou médico já se preocupou com seu modo de beber. Após a análise multivariável, permaneceram associados com o uso problemático de álcool o sexo masculino, a faixa etária de 20 a 29 anos, pessoas solteiras, que se declararam pardas, e ex-fumantes ou fumantes atuais. CONCLUSÃO: A prevalência de uso problemático de álcool é elevada em comparação com outros estudos semelhantes, existindo diferenças segundo características demográficas, cor de pele e comportamentais. Estas questões devem ser consideradas na formulação de políticas públicas de saúde que objetivem a redução dos problemas relacionados ao uso de álcool.

  18. The use of steel and lead shieldings in radiotherapy rooms and its comparison with respect to neutrons doses at patients; Comparacao de blindagens de aco e de chumbo usadas em salas de radioterapia quanto a dose devido a neutrons depositada em pacientes

    Energy Technology Data Exchange (ETDEWEB)

    Silva, M.G.; Rebello, W.F.; Andrade, E.R.; Medeiros, M.P.C.; Mendes, R.M.S.; Braga, K.L.; Gomes, R.G., E-mail: maglosilva15@gmail.com, E-mail: rebello@ime.eb.br, E-mail: fisica.dna@gmail.com, E-mail: eng.cavaliere@gmail.com, E-mail: raphaelmsm@gmail.com, E-mail: kelmo.lins@gmail.com, E-mail: ggrprojetos@gmail.com [Instituto Militar de Engenharia (IME), Rio de Janeiro, RJ (Brazil); Santos, R.F.G., E-mail: raphaelfgsantos@gmail.com [Centro Universitario Anhanguera, Niteroi, RJ (Brazil). Departamento de Engenharia; Silva, Ademir X., E-mail: ademir@con.ufrj.br [Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, RJ (Brazil)

    2015-07-01

    The NCRP Report No. 151, Structural Shielding Design and Evaluation for Megavoltage X- and Gamma-Ray Radiotherapy Facilities, considers, in shielding calculations for radiotherapy rooms, the use of lead and/or steel to be applied on bunker walls. The NCRP Report calculations were performed foreseeing a better protection of people outside the radiotherapy room. However, contribution of lead and steel to patient dose should be taken into account for radioprotection purposes. This work presents calculations performed by MCNPX code in analyzing the Ambient Dose Equivalent due to neutron, H*(10){sub n}, within a radiotherapy room, in the patients area, considering the use of additional shielding of 1 TVL of lead or 1 TVL of steel, positioned at the inner faces of walls and ceiling of a bunker. The head of the linear accelerator Varian 2100/2300 C/D was modeled working at 18MeV, with 5x5cm{sup 2}, 10x10cm{sup 2}, 20x20cm{sup 2}, 30x30cm{sup 2} and 40x40cm{sup 2} openings for jaws and MLC and operating in eight gantry's angles. This study shows that the use of lead generates an average value of H*(10){sub n} at patients area, 8.02% higher than the expected when using steel. Further studies should be performed based on experimental data for comparison with those from MCNPX simulation.

  19. O impacto na cultura organizacional devido a implantação da tecnologia da informação: um estudo de caso em um hospital filantrópico / Impact on organizational culture due to deployment of information technology: a case study in a charity hospital

    Directory of Open Access Journals (Sweden)

    Henrique César Melo Ribeiro

    2013-08-01

    Full Text Available Cada vez mais a Tecnologia da Informação está tendo um papel de importância na estratégia da organização, impactando também em sua cultura. Uma organização para conseguir obter diferencial, tem que está integrada e alinhada com seus processos e a TI vem proporcionando e facilitando tal vinculo. Entende-se que a TI é uma ferramenta que traz diferencial e que a cultura é difícil de ser moldada. O objetivo deste artigo foi estudar o impacto na cultural organizacional pela introdução da tecnologia de informação em um hospital filantrópico. Foi uma pesquisa tipo exploratória, de campo, qualitativa e quantitativa, sendo adotada a técnica de estudo de caso. A coleta dos dados foi feita por meio de questionários fechados. Conclui-se que o Hospital Filantrópico estudado, mantinha-se com um certo conservadorismo em sua cultura e que há sete anos foi sendo adotada tecnologias de ponta no Hospital, impactando diretamente em sua cultura da organização.

  20. Classification of areas considering equivalent doses due to radon, indoors in the Institute of Chemical, Biological, Radiological and Nuclear Defense (IDQBRN); Classificação de áreas considerando as doses equivalentes devido a radônio, em ambientes fechados no Instituto de Defesa Química, Biológica, Radiológica e Nuclear (IDQBRN)

    Energy Technology Data Exchange (ETDEWEB)

    Arbach, Mayara N.; Soares, Alexandre B., E-mail: mayaraarbach@gmail.com, E-mail: alexandrebaso@globo.com [Instituto de Radioproteção e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil); Alves, Rex N.; Cardoso, Domingos D’ O.; Júnior, Walter José. G., E-mail: rexnazare@ime.eb.br, E-mail: domin@ime.eb.br, E-mail: walter_guimaraes@ime.eb.br [Instituto Militar de Engenharia (IME), Rio de Janeiro, RJ (Brazil)

    2017-07-01

    The human being is subject to several sources of natural radiation, mainly radon, belonging to the radioactive decay chain of uranium and thorium. At the study site, approximately 3.3 tons of uranium with natural concentration are stored. This fact, which generated the concern about the occupational dose levels of the IOE's of the facility, because its effective dose will have the increase due to the equivalent dose from the exposure to radon. The measurements took place: in the uranium deposit; in an adjoining room and at the control point. According to the norm CNEN - NN 3.01 and considering the existing radon concentrations in the three environments it was concluded that: the uranium deposit room is considered a controlled area; the control point a free area and the contiguous room, a supervised area.

  1. Hiperbilirrubinemia neonatal prolongada devido à associação entre síndrome de Gilbert e doença hemolítica por incompatibilidade RhD Persistent neonatal hyperbilirubinemia resulting from Gilbert's syndrome in association with RhD hemolytic disease

    Directory of Open Access Journals (Sweden)

    Fernando P. Facchini

    2005-10-01

    Full Text Available OBJETIVO: Relatar associação infreqüente de patologia que cause aumento considerável de produção de bilirrubina e outra diminuição importante na sua excreção. DESCRIÇÃO: Mãe tercigesta, Rh negativo. Na primeira gestação, gerou recém-nascido normal, de termo, não tendo recebido imunoglobulina humana anti-RhD. A segunda gestação complicou-se por isoimunização Rh, dando à luz neonato de termo, o qual necessitou três exsanguinotransfusões e faleceu com 8 dias de vida. Na gestação atual, conseguiu dar à luz a termo recém-nascido tipo ORh positivo, Coombs direto positivo, bilirrubina de cordão 6,5 mg/dl e hematócrito 44%. Com 5 horas de vida, estava ictérico, tendo sido iniciados fenobarbital (por 3 dias e fototerapia intensiva. A hiperbilirrubinemia foi logo controlada, porém ascendia rapidamente sempre que a fototerapia era suspensa. No 10° dia de vida, a criança foi transfundida por anemia importante. Em vista da persistência da icterícia, no 13° dia de vida pensou-se em associação com síndrome de Gilbert, e o seqüenciamento de DNA foi solicitado. O resultado mostrou genótipo mutante homozigoto UDPT1A1[TA]7TAA. Permaneceu em fototerapia até o 17° dia de vida. Recebeu alta no dia seguinte, após controle de bilirrubinemia. Voltou para acompanhamento ambulatorial e apresentou desenvolvimentos pondo-estatural e neurológico normais. COMENTÁRIOS: O caso ressalta a importância da associação do aumento de produção/diminuição de excreção de bilirrubina na gênese de hiperbilirrubinemias prolongadas, intensas e passíveis de causar kernicterus, se não tratadas vigorosamente. Demonstra, ainda, a eficácia da fototerapia intensiva, reduzindo os riscos de tratamentos mais agressivos. Ressalta, também, a importância do acompanhamento das icterícias neonatais até a completa remissão dos sintomas.OBJECTIVE: To report on an infrequent association of pathologies causing considerable increase in bilirubin production and a signifiant decrease in its excretion. DESCRIPTION: The third pregnancy of an RhD negative woman. Her first child was normal and delivered to term and did not receive Rhogam. The second pregnancy was problematic due to Rh isoimmunization. She delivered a child to term, who required three exchange transfusions, but died on the 8th day of life. The third child was delivered at term, ORh positive, direct Coombs positive and had stump bilirubin of 6.5 mg/dl and hematocrit at 44%. Five hours after birth the child was jaundiced. Phenobarbital and intensive phototherapy were introduced. Hyperbilirubinemia was soon controlled, but relapsed whenever phototherapy was discontinued. On the 10th day of life the child received a transfusion for significant anemia. As jaundice persisted to the 13th day, associated Gilbert syndrome was considered and DNA sequence analysis was requested. The test demonstrated a mutant homozygote genotype UDPT1A1[TA]7TAA. Phototherapy remained necessary until the 17th day of life and she was discharged from hospital the following day, after bilirubinemia had been controlled. She returned for follow-up and exhibited normal growth and neurological development. COMMENTS: This case demonstrates the significance of increased bilirubin production/decreased bilirubin excretion causing intense hyperbilirubinemias and, in the abnsence of vigorous treatment, kernicterus. The effectiveness of intense phototherapy has also been demonstrated, reducing the risks of more aggressive treatments such as exchange transfusion. It also provides evidence of the importance of bilirubinemia follow-up until complete resolution.

  2. Avaliação do nível da vulnerabilidade do solo devido à presença de termelétrica a carvão (Figueira, PR- Brasil Evaluation of the soil sensitivity for the acidity near a coal fired power plant (Figueira, PR-Brazil

    Directory of Open Access Journals (Sweden)

    Marlene Flues

    2003-08-01

    Full Text Available Rainwater samples were analyzed during a one-year period (June 1999 - June 2000 and presented concentration of pH = 4.9 (volume weight mean. The ions concentrations results showed a high sulfate concentration (35 µmol L-1, followed by the cations concentration of sodium, calcium and ammonium (35, 16 and 30 µmol L-1, respectively. Due to the great contribution of these cations in the sulfate neutralization action, the rainwater of this region had only a light acid characteristic. The soil characteristic was acid and the bioavailable concentration of the alkaline cations (Ca, Mg and K presented high calcium concentrations (1001 ± 357 mg kg-1 compared with the other cations. The determination of soil sensitivity to acid rain was calculated by the ratio BC/Al3+ (BC = Ca2+ + Mg2+ + K+ and presented the average value of 5.1 ± 3.3. This preliminary evaluation of soil susceptibility by the ratio BC/Al3+ showed that the local soil and vegetation type (tropical Savannah were sensitive to acid deposition. The long term of this impacting condition (acid rain, high sulfate deposition could be harmful to the soil and vegetation quality.

  3. Análise proteômica da polpa dentária humana com diferentes condições clínicas endodônticas

    OpenAIRE

    Silva, Poliana Amanda Oliveira

    2017-01-01

    A Análise proteômica de diferentes condições clínicas da polpa dentária humana pode fornecer informações globais sobre mecanismos de patogenicidade e interações multifatoriais existentes entre microrganismos e o tecido pulpar humano. Assim, o objetivo do estudo foi analisar de forma qualitativa proteínas presentes no tecido pulpar em condições clínicas de polpa normal, pulpite irreversível e necrose com lesão periapical visível radiograficamente. Para isso, três réplicas biológicas, conten...

  4. Interpretación fisiopatológica de los diferentes estadios de una pulpitis Physiopathological interpretation of the different pulpitis stages

    Directory of Open Access Journals (Sweden)

    Andrés O. Pérez Ruiz

    2005-08-01

    Full Text Available La caries dental que vulnera los tejidos duros del diente y compromete a la pulpa provoca un proceso inflamatorio que progresa por varias fases o estadios: pulpitis reversible, pulpitis transicional, pulpitis irreversible y pulpa necrótica. El tejido pulpar agredido por microorganismos no experimenta una necrosis repentina, sino que va sucumbiendo progresivamente, y cada uno de los estadios pulpares por los que transita el proceso, se puede ir identificando mediante el dolor con sus características semiológicas propias de cada fase, lo que permite precisar con bastante certeza el estado pulpar por el que avanza el proceso inflamatorio en dicho tejido. La interpretación fisiopatológica de los diferentes estadios pulpares por los que transita una pulpitis y el seguimiento del dolor como síntoma cardinal del proceso inflamatorio, es una forma de diagnóstico que complementa el pensamiento interpretativo del clínico que atiende estas urgencias, y le permite una mejor comprensión de su evolución y establecer así el correcto tratamiento.The dental caries that harms the hard tissues of the tooth and compromises the pulp produces an inflammatory process that progresses through various phases or stages: reversible pulpitis, transitional pulpitis, irreversible pulpitis and necrotic pulp. The pulpar tissue attacked by microorganisms does not experiment a sudden necrosis, but it progressively succumbs and each of the pulpar stages the process goes through may be identified by the pain with its own semiological characteristics of every stage, which allows to determine with enough accuracy the pulpar stage through which the inflammatory process advances in this tissue. The physiopathological interpretation of the different pulpar stages of a pulpitis and the follow-up of pain as a cardinal symptom of the inflammatory process is a form of diagnosis complementing the interpretative thinking of the clinician that gives attention to these emergencies

  5. Posibilidad regenerativa y reparadora de estructuras dentarias de células mesenquimáticas post natales

    OpenAIRE

    Siragusa, Martha

    2014-01-01

    Objetivos: Presentar evidencias clínicas de la capacidad reparativa y de la formación de nuevos tejidos mineralizados en dientes con apices incompletamente desarrollados y diagnóstico de necrosis pulpar. Ha sido demostrado que las células pulpares adultas y las del ligamento periodontal presentan un comportamiento similar en su morfología y que la superficie cellular responde positivamente a marcadores de hueso, tejido adiposo, músculos y al estroma de tejido conectivo. La posibilid...

  6. Periapical and pulp lesions in the stomatological emergency consultation at Felipe Soto dental clinic. 2010-2011

    OpenAIRE

    Bertrán Herrero, Grethell; Rosales Alonso, José Luis

    2014-01-01

    Introducción: la mayoría de las urgencias estomatológicas se debe a enfermedades pulpares y periapicales. En nuestro país son pocos los estudios realizados en relación con la prevalencia de estas lesiones en la población, lo que motivó la realización de este trabajo. Objetivo: determinar el comportamiento de las lesiones pulpares y periapicales en pacientes de 19 a 59 años. Material y Método: se realizó un estudio descriptivo y transversal a pacientes comprendidos entre 19 y 59 años de edad q...

  7. Repellent Activities of Essential Oils of Some Plants Used Traditionally to Control the Brown Ear Tick, Rhipicephalus appendiculatus

    NARCIS (Netherlands)

    Wanzala, W.W.; Hassanali, A.; Mukabana, W.R.; Takken, W.

    2014-01-01

    Essential oils of eight plants, selected after an ethnobotanical survey conducted in Bukusu community in Bungoma County, western Kenya (Tagetes minuta, Tithonia diversifolia, Juniperus procera, Solanecio mannii, Senna didymobotrya, Lantana camara, Securidaca longepedunculata, and Hoslundia

  8. Assessing effect of rainfall on rate of alien shrub expansion in a ...

    African Journals Online (AJOL)

    Assessing effect of rainfall on rate of alien shrub expansion in a southern African savanna. ... Keywords: aerial photography, invasion, Kyle Game Reserve, Lantana camara, patch dynamics, rainfall variability ... AJOL African Journals Online.

  9. INvENTAIRE FLORISTIqUE ET EFFET DE LA DENSITÉ DE ...

    African Journals Online (AJOL)

    KyllingaerectaSchum. var. flabelliformis (Cyperaceae). +. +. +. 92. Kyllingapumila Michaux (Cyperaceae). +. +. +. 93. Lantana camara L. (verbenaceae). +. -. -. 94. Leptoderrisfasciculata(Benth.) Dunn. (Fabaceae). -. +. -. 95. Lindernia diffusa (L.) Wettst. (Scrophulariaceae). +. -. -. 96. Ludwigiaabyssinica A. Rich. (Onagraceae).

  10. International Development Research Centre

    International Development Research Centre (IDRC) Digital Library (Canada)

    ... development. Learn moreArtificial intelligence and human development ... New initiative will match climate knowledge to developing country needs. Aminata Camara ... Shadow Libraries: Access to Knowledge in Global Higher Education.

  11. Finding of No Significant Impact/Finding of No Practicable Alternative: Environmental Assessment of the Privatization of Military Family Housing at MacDill Air Force Base, Florida

    Science.gov (United States)

    2007-10-09

    mimosa (Albizia julibrissin), cattails (Typha spp.), cogon grass (Imperata cylindrical), water hyacinth (Eichhornia crassipes), lantana (Lantana camara...exotic invaders such as Australian pine, mimosa, and cogon grass . Another concern is mangrove tree invasion of drainage ditches. While mangrove

  12. An Investigation of the Combat Air Patrol Stationing in an Integrated Air Defense Scenario

    Science.gov (United States)

    1990-12-01

    guided missiles, drones , decoys and short range missiles and bombs. The defensive elements include a C2 netting of early warning (EW), ground...M, 69 andar 70045 Brasilia, DF Brasil 6. Departamento de Ensino Da Aerondutica Av. Mal CAmara , 233, 10 andar 20020 Rio de Janeiro, RJ Brasil 7...Diretoria de Informdtica e Estatfstica da Aeron~utica Av. Mal CAmara , 233, 8Q andar 20020 Rio de Janeiro, RJ Brasil 11. Centro de Computagdo da Aeronutica-BR

  13. Evaluación histológica de pulpotomia en dientes de perro, en formación de puentes dentinario al utilizar trixido mineral agregado(M.T.A) e hidróxido de calcio

    OpenAIRE

    Herrera, Henry; Herrera, Helen de; Sermeño, Ruth de; Herrera Castaneda, Hilda; Ruiz de Campos, Guadalupe

    2009-01-01

    El presente estudio experimental, fue comparar histológicamente el puente dentinatario formado sobre el tejido remanente pulpar por el hidróxido de calcio y el trióxido mineral agregado,utilizados en la técnica de pulpotomía en piezas dentales de perros.

  14. Manejo clínico de la caries profunda

    Directory of Open Access Journals (Sweden)

    María Elia Alonso

    Full Text Available La lesión cariosa profunda por la posibilidad de afectación pulpar, es un cuadro clínico de especial significación y permanente vigencia. Su tratamiento requiere de protocolos bien establecidos, de manera que la técnica empleada pueda ser conservadora y proporcione una amplia cobertura asistencial. Es fundamental el conocimiento de la etiopatogenia, de los correctos diagnósticos de la salud pulpar, de las propiedades de bases y protectores, así como también del correcto sellado marginal de la restauración coronaria. El objetivo será siempre mantener de manera conservadora la salud pulpar, dejando a la pieza apta para su restauración en forma, función y estética. Este artículo recoge el trabajo de una comisión que sistematizó los protocolos clínicos para la Protección Pulpar Indirecta (PPI y para el Tratamiento Pulpar Indirecto (TPI, con eliminación de caries en forma diferida. Los mismos se utilizan actualmente en la Clínica Integrada de Adultos III, Facultad de Odontología, Universidad de la República (Uruguay. Se considera que el Hidróxido de Calcio (Ca(OH2 sigue manteniendo su vigencia, siendo condición necesaria de su uso una pulpa saludable y requerimientos de reacción defensiva por depósito de tejido mineralizado

  15. Use of MCNP to compare the response of dose deposited in the TLD 100, TLD 600 and TLD 700 in radiation fields due to {sup 60}Co and {sup 241}AmBe source; Uso do MCNP para comparacao das respostas de dose depositada nos TLD 100, TLD 600 e TLD 700 em campos de irradiacao devido a fontes de {sup 60}Co e {sup 241}AmBe

    Energy Technology Data Exchange (ETDEWEB)

    Cavalieri, Tassio A.; Castro, Vinicius A.; Siqueira, Paulo T.D., E-mail: tassio.cavalieri@usp.br [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2012-08-15

    The successes of Boron Neutron Capture Therapy (BNCT) depend on the ability to deliver an adequate irradiation field to the target cells. Neutron beams used in BNCT are mostly driven from reactors and therefore, not only have a neutron energy range which far exceeds the thermal region but also do have a great gamma component. Beam characterization and dosimetry are consequently one of the essential procedures to be overcome to properly apply this technique. One of the methods currently used in mixed field (field containing both neutron and gamma) characterization, lies on the use of a pair of detectors with distinct responses to each beam component. But this technique needs to be better understood of how each thermoluminescent dosimeter (TLD) behaves in a mixed field or in a pure field. This work presents the results of a set of simulations performed in order to analyze the response of three ordinary types of TLDs - TLD 100, TLD 600 and TLD 700 - submitted to different irradiation fields from a Cobalt source and an Americium-Beryllium source inside a paraffin disk. And is also a possible method for performing the selection and calibration of theses TLDs. (author)

  16. Health, environmental, and economic costs from the use of a stabilized diesel/ethanol mixture in the city of São Paulo, Brazil Avaliação dos custos econômicos, ambientais e de saúde pública devido ao uso de mistura diesel/etanol estabilizada por um aditivo comercial na cidade de São Paulo, Brasil

    Directory of Open Access Journals (Sweden)

    Simone Georges El Khouri Miraglia

    2007-01-01

    Full Text Available In Greater Metropolitan São Paulo, Brazil, fossil fuel combustion in the transportation system is a major cause of outdoor air pollution. Air quality improvement requires additional policies and technological upgrades in fuels and vehicle engines. The current study thus simulated the environmental and social impacts resulting from the use of a stabilized diesel/ethanol mixture in the bus and truck fleet in Greater Metropolitan São Paulo. The evaluation showed reductions in air pollutants, mainly PM10, which would help avert a number of disease events and deaths, as estimated through dose-response functions of epidemiological studies on respiratory and cardiovascular diseases. Valuation of the impacts using an environmental cost-benefit analysis considered operational installation, job generation, potential carbon credits, and health costs, with an overall positive balance of US$ 2.851 million. Adding the estimated qualitative benefits to the quantitative ones, the project's benefits far outweigh the measured costs. Greater Metropolitan São Paulo would benefit from any form of biodiesel use, producing environmental, health and socioeconomic gains, the three pillars of sustainability.A poluição atmosférica na Região Metropolitana de São Paulo, Brasil, é devida principalmente à queima de combustíveis fósseis utilizados no sistema de transportes. A fim de melhorar a qualidade do ar, são necessárias políticas e melhorias tecnológicas em combustíveis e motores veiculares. Neste sentido, foi realizada uma avaliação dos impactos ambientais e sociais da mistura estabilizada do uso de diesel/etanol na frota de ônibus e caminhões na Região Metropolitana de São Paulo. Essa avaliação mostrou reduções nos poluentes atmosféricos, especialmente o MP10, o que contribuiu para um número de eventos de morbidade e mortalidade evitáveis estimados por meio de funções dose-resposta de estudos epidemiológicos em termos de doenças respiratórias e cardiovasculares. A valoração dos impactos representada através de uma análise custo-benefício ambiental resultou positiva em US$ 2,851 milhões. Adicionando-se a essa quantia os benefícios estimados em termos qualitativos, pode-se concluir que os benefícios sócio-econômicos do projeto superam os custos mensurados. A Região Metropolitana de São Paulo se beneficiará de qualquer tipo de biodiesel produzindo ganhos em termos ambientais, de saúde e de inclusão sócio-econômica, os três pilares da sustentabilidade.

  17. Prevention of skin reactions due to teletherapy in women with breast cancer: a comprehensive review Prevención de las reacciones en la piel debido a teleterapia en mujeres con cáncer de mama: revisión integradora Prevenção de reações de pele devido à teleterapia em mulheres com câncer de mama: revisão integrativa

    Directory of Open Access Journals (Sweden)

    Marceila de Andrade

    2012-06-01

    Full Text Available One of the possible courses of cancer treatment is teletherapy, and one of the most important adverse side effects are skin reactions, an ailment more commonly called radiodermatitis. The main purpose of this study is to analyze knowledge of the evidence about topical products used in the prevention of radiodermatitis, to support care delivery to women with breast cancer during teletherapy. The research method used here is the comprehensive literature review. Four databases were used to select the bibliography. The sample consists of 15 articles. The data shows that, among the topical products analyzed here, Calendula, corticosteroids and Xclair have shown significant protective effects, underlining their actions. The lack of articles published in Brazil highlights the need for further research in this area, seeking better care quality through the use of products with scientifically proven efficiency.Teleterapia está entre las modalidades de tratamiento para el cáncer y uno de sus principales efectos adversos son reacciones de la piel, comúnmente llamado radiodermatitis. Este estudio objetivó analizar el conocimiento acerca de los productos tópicos utilizados para la prevención de la radiodermatitis que justifiquen la atención en teleterapia en mujeres con cáncer de mama. Se adoptó como método de investigación la revisión integradora de la literatura. Para la selección de los artículos se utilizaron cuatro bases de datos. La muestra fue constituida por 15 artículos. Los datos muestran que entre los productos tópicos analizados la caléndula, esteroides y Clair X tuvo un efecto protector significativo, destacando así por sus acciones. La ausencia de artículos publicados en Brasil se centra en la necesidad de seguir investigando para mejorar la calidad de la atención mediante el uso de productos con una eficacia científicamente probada.Dentre as modalidades de tratamento para o câncer está a teleterapia, e um dos principais efeitos adversos dessa modalidade são as reações de pele, comumente chamadas radiodermatites. O presente estudo teve como objetivo analisar o conhecimento sobre as evidências acerca de produtos tópicos, utilizados na prevenção de radiodermatite, que fundamente o cuidado em teleterapia direcionado a mulheres com câncer de mama. Adotou-se como método de pesquisa a revisão integrativa da literatura. Para a seleção da bibliografia utilizaram-se quatro bases de dados. A amostra constitui-se de 15 artigos. Os dados demonstram que, dentre os produtos tópicos analisados, a calêndula, os corticoesteroides e o Xclair tiveram efeito protetor significante, destacando-se, assim, pelas suas ações. A ausência de artigos publicados no Brasil mostra a necessidade de mais pesquisas nessa área, visando a melhor qualidade na assistência a mulheres com câncer de mama, por meio da utilização de produtos com eficácia comprovada cientificamente.

  18. Avaliação dos pacientes submetidos à descompressão e artrodese póstero-lateral devido à espondilolistese degenerativa com dois anos de acompanhamento Evaluación de los pacientes sometidos a descompresión y artrodesis posterolateral debido a la espondilolistesis degenerativa con dos años de seguimiento Evaluation of patients undergoing decompression and posterolateral arthrodesis because of degenerative spondylolisthesis with two years of follow up

    Directory of Open Access Journals (Sweden)

    Fernando William Figueiredo da Rosa

    2012-09-01

    Full Text Available OBJETIVO: Avaliar os resultados da descompressão e da artrodese póstero-lateral na espondilolistese degenerativa em pacientes que têm como sintoma principal a claudicação neurogênica. MÉTODO: Foram selecionados 21 pacientes com espondilolistese degenerativa, com indicação de tratamento cirúrgico. Foram avaliados 8 homens e 13 mulheres com idades entre 36 e 77 anos. O procedimento cirúrgico padronizado foi a artrodese póstero-lateral com instrumentação e descompressão associada. Os pacientes foram avaliados por VAS, índice de Oswestry e Roland-Morris no pré-operatório, com um mês, seis meses, um ano e dois anos de seguimento. Os dados foram analisados estatisticamente com nível de significância de 5%. RESULTADOS: O nível mais frequentemente operado foi L4-L5, com 52,38%. A VAS teve melhora significativa de 53,48% nos 6 meses após o procedimento. O Índice de Incapacidade de Oswestry apresentou piora no primeiro mês, evolução para melhora da capacidade até o sexto mês, e permaneceu constante até o fim do acompanhamento. Segundo o questionário de Incapacidade de Roland-Morris, houve melhora progressiva significativa até o sexto mês e, por último, uma leve piora. CONCLUSÃO: Os pacientes com espondilolistese degenerativa submetidos à artrodese póstero-lateral instrumentada e descompressão apresentaram melhora significativa da qualidade de vida e da dor após dois anos de acompanhamento.OBJETIVO: Evaluar los resultados de la descompresión y de la artrodesis posterolateral en la espondilolistesis degenerativa en pacientes que tienen, como síntoma principal, la claudicación neurogénica. MÉTODO: Se seleccionaron 21 pacientes con espondilolistesis degenerativa, con indicación de tratamiento quirúrgico. Se evaluaron 8 hombres y 13 mujeres, con edades de 36 a 77 años. El procedimiento quirúrgico estandarizado fue la artrodesis posterolateral con instrumentación y descompresión vinculada. Los pacientes fueron evaluados VAS, Índice de Oswestry y Roland-Morris en el preoperatorio, con seguimiento de un mes, seis meses, un año y dos años. Los datos fueron analizados, estadísticamente, con nivel de significación de 5%. RESULTADOS: El nivel operado más frecuentemente fue L4-L5, con 52,38%. El VAS tuvo mejoría significativa de 53,48% en los 6 meses posteriores al procedimiento. El Índice de Incapacidad de Oswestry presentó empeoramiento en el primer mes, evolución para mejoría de la capacidad hasta el sexto mes, y permaneció constante hasta el fin del acompañamiento. Según el cuestionario de Incapacidad de Roland-Morris, hubo mejoría progresiva significativa hasta el sexto mes y, por último, un leve empeoramiento. CONCLUSIÓN: Los pacientes con espondilolistesis degenerativa, sometidos a la artrodesis posterolateral instrumentada y a la descompresión, presentaron mejoría significativa de la calidad de vida y del dolor, aún después de dos años de acompañamiento.OBJECTIVE: To evaluate the decompression and posterolateral arthrodesis in degenerative spondylolisthesis in patients whose main symptom is neurogenic claudication. METHODS: We selected 21 patients with degenerative spondylolisthesis who were referred for surgical treatment. 8 men and 13 women between aged 36 and 77 years were evaluated. The standardized surgical procedure was posterolateral arthrodesis with instrumentation and decompression associated. Patients were evaluated by VAS, Oswestry Disability Index and Roland-Morris questionnaire preoperatively, with one month, six months, one year, and two years of follow up. Data were analyzed statistically with a significance level of 5%. RESULTS: The most frequently operated level was L4-L5 with 52.38%. VAS had significant improvement of 53.48% 6 months after the procedure. The Oswestry Disability Index showed a worsening in the first month, with improved capacity until the sixth month, remaining constant until the end of follow up. According to the Roland-Morris Disability questionnaire there was a significant progressive improvement up to six months and, finally, a slight worsening. CONCLUSION: Patients with degenerative spondylolisthesis who underwent posterolateral instrumented fusion and decompression showed significant improvement in quality of life and pain after two years of monitoring.

  19. Recommended values of the humidity correction factor k{sub n} for determining exposure in an X-ray beam with free-air chambers; Valores recomendados del factor de correccion por humedad, k{sub h} para la determinacion de la exposicion en un haz de rayos X usando camaras de paredes de aire

    Energy Technology Data Exchange (ETDEWEB)

    Los Arcos, J M; Brosed, A

    1983-07-01

    The experimental values stated by CCEMRI (Section I) concerning the humidity correction factor k{sub h} required for determining exposure in an X-ray beam with free-air chambers are commented and a method to estimate k{sub n} numerically, at any particular combination of relative humidity, pressure and temperature, la explained. A table of k{sub h}, calculated for relative humidity varying from 0% to 90%, for pressures in the range of 70 kPa to 104kPa and temperatures between 15 degree centigree and 30 degree centigree, is included. (Author) 10 refs.

  20. The test of intrinsic uniformity is one of the basic tests to check the status of the detectors of gamma cameras, and as such is contained in RD 1 841/1997 Quality Control in Nuclear Medicine; Protocolo NEMA para el calculo de la uniformidad intrinsica en gamma-camaras: aplicacion y comparacion con el software del fabricante

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez Soto, X. L.; Gonzalez Ruiz, C.; Lopez-Boto, M. A.; Polo Cezon, R.

    2015-07-01

    Spanish Protocol Quality Control Instrumentation in Nuclear Medicine provides guidelines for conducting this test, similar to those established in the NEMA protocol NEMA Protocol for the calculation of the uniformity intrinsic in GAMMA cameras: application and comparison with the SQFTWARE of the manufacturer. it is advisable to conduct a study to ensure that the results for the test of intrinsic uniformity of the software provided by the equipment manufacturer are equivalent to those obtained by applying the protocol recommended by the SEFM before using this software for performing quality control. (Author)

  1. Analysis of dosimetry of a Gamma Knife Perfexion using polystyrene and solid water phantoms for small volume ionization chambers; Analise da dosimetria de um Gamma Knife Perfexion utilizando phantoms de poliestireno e de agua solida para camaras de ionizacao de volume pequeno

    Energy Technology Data Exchange (ETDEWEB)

    Costa, N.A.; Potiens, M.P.A., E-mail: nathaliaac@ymail.com [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil); Saraiva, C.W.C. [Hospital do Coracao (HCor), Sao Paulo, SP (Brazil); Benmakhlouf, H. [Stockholm University, Karolinska Hospital (Sweden)

    2016-07-01

    The Gamma Knife Perfexion (GKP) is a radiosurgery equipment that has been developed by Elekta. Its dose-rate calibration is performed using phantoms developed by Elekta and a small volume ionization chamber. The purpose of this study was to evaluate the collected charge values obtained in its dosimetry using two different phantoms, polystyrene and solid water and the ion chambers PTW Semiflex, volume 0,125 cm{sup 3}, model 31010 and PTW Pinpoint, volume 0,016 cm{sup 3}, model 31016. (author)

  2. Uncertainty evaluation of the kerma in the air, related to the active volume in the ionization chamber of concentric cylinders, by Monte Carlo simulation; Avaliacao de incerteza no kerma no ar, em relacao ao volume ativo da camara de ionizacao de cilindros concentricos, por simulacao de Monte Carlo

    Energy Technology Data Exchange (ETDEWEB)

    Lo Bianco, A.S.; Oliveira, H.P.S.; Peixoto, J.G.P., E-mail: abianco@ird.gov.b [Instituto de Radioprotecao e Dosimetria (IRD/CNEN-RJ), Rio de Janeiro, RJ (Brazil). Lab. Nacional de Metrologia das Radiacoes Ionizantes (LNMRI)

    2009-07-01

    To implant the primary standard of the magnitude kerma in the air for X-ray between 10 - 50 keV, the National Metrology Laboratory of Ionizing Radiations (LNMRI) must evaluate all the uncertainties of measurement related with Victtoren chamber. So, it was evaluated the uncertainty of the kerma in the air consequent of the inaccuracy in the active volume of the chamber using the calculation of Monte Carlo as a tool through the Penelope software

  3. Implementation of the method air-kerma product area in KAP camera calibration with reference qualities of X-ray series at the SSDL RQR of Mexico; Implementacion del metodo producto kerma en aire-area en la calibracion de camaras KAP con calidades de referencia de rayos X de la serie RQR en el LSCD de Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Cejudo, Jesus; Tovar, Victor M., E-mail: jesus.cejudo@ini.gob.mx, E-mail: victor.tovar@inin.gob.mx [lnstituto Nacional de lnvestigaciones Nucleares (DMRI/LSDC/lNlN), Ocoyoacac (Mexico). Centro Nuclear Dr. Nabor Carrillo Flores. Laboratorio Secundario de Calibracion Dosimetrica

    2013-10-01

    The X-Ray machines, at a reference laboratory for the instrument calibration in diagnostic radiology, should compliance with the ISO requirements. Sometimes there is not available as much laboratories as needed in Latin American countries. So this project shows the KAP ionization chamber implementation method using the TRS-457 radiation quality from the IAEA at the SSDL of Mexico. The KAP instruments calibration method consists in doing a substitution comparison using a standard reference with traceability to a primary laboratory and a transmission-monitoring chamber that measures the number of photons of the X-ray primary beam. A KAP chamber calibration requires a special array that consists in collocating the chamber in two different positions of its calibration process. Then, with air kerma-area product coefficient together with a corrected electrometer measure at referential conditions, the patient dosimetry magnitudes are calculated. The dosimetry necessity at hospitals always will be in function of possessing a highly reliable calibration coefficient chamber for making these measures. That dosimetry results will help in reducing the total or partial irradiation emitted to the human body of the patient. This is how stochastic risks will be lessened due to diagnostic studies. The purpose of this project is to have a synergy with calibration for making known that the SSDL of Mexico has the technical capacity to act as a link between primary standard dosimetry laboratories and the ionizing radiation equipment users who require that their KAP chamber have traceability from the primary standard to the user. (author)

  4. Validation of the Read Out Electronics for the CMS Muon Drift Chambers at Tests Beam in CERN/GIF; Validacion en el Test Beam del CERN/GIF de la electronica de Lectura de las Camaras de Muones del Experimento CMS

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez, C.; Fouz, M. c.; Marin, J.; Oller, J. C.; Willmott, C.; Amigo, L. J.

    2002-07-01

    Part of the readout system for the CMS muon drift chambers has been tested in test beams at CERN/GIF. Read Out Board (ROB) and HPTD have been validated with signals from a real muon beam, with an structure and flux similar to LHC operating conditions and using one of the chambers produced in CIEMAT already located in the test beam area under normal gas and voltage conditions. (Author) 5 refs.

  5. Reuse of the red brick waste and dust waste of blasting chamber (glass micro spheres) in the red ceramic industry; Reaproveitamento dos residuos de tijolos vermelhos e do residuo de poeira da camara de jateamento (micro esferas de vidro) na industria de ceramica vermelha

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigues, R.A.; Felippe, C.E.C.; Guimaraes, C.S.; Almeida, V.C., E-mail: valeria@eq.ufrj.b [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Centro de Tecnologia. Escola de Quimica

    2010-07-01

    The search for alternative environmentally less aggressive disposal of solid waste has been adopted to reverse the negative scenario established by the improper disposal of these materials. The aim of this study was to evaluate the reuse of waste: leftover red brick from the civil construction and glass micro spheres, obtained from the blasting chamber, aiming to develop a ceramic product. Mixtures containing various amounts of waste were prepared. The ceramic pieces were burned at 1000 and 1200 deg C being tested for water absorption and tensile strength and characterized by X-ray diffraction. The analysis of volatile organic compounds released during the burning process was performed. The results indicate that the ceramic material produced has a high resistance although the analysis of gases from the burning point to a negative environmental impact. (author)

  6. Point absorbed dose verification for volumetric modulated arc therapy plans. A comparative study between ionization microchamber and chamber array; Verificacion de dosis absorbida en un punto para planes de arcoterapia volumetrica modulada. Estudio comparativo entre microcamara de ionizacion y matriz de camaras

    Energy Technology Data Exchange (ETDEWEB)

    Caudepon Moreno, F.; Pizarro Trigo, F.; Sanchez Jimenez, J.; Nunez Martinez, L.; Morillas Ruiz, J.; Palomo Llinares, R.

    2016-10-01

    According to the international recommendations a quality control must be made for IMRT treatments before these can be delivered. These recommendations are applied to volumetric modulated arc therapy treatments in our Department. As a part of the verifications chain, measurements of absorbed dose in a phantom point and in the phantom volume are made for a specific patient with ionization chamber and ionization chambers array, respectively. The aim of this issue is to compare measurements of absorbed dose between these two kinds of detectors. The predictions of absorbed dose from Treatment Planning System are taken as the reference one. The differences among these measurements and the reference are calculated for 105 specific patients. A statistical analysis shows that the measurements of absorbed dose with chamber and array are strongly correlated. This result allows us to eliminate from our verifications chain the measurements of absorbed dose in a phantom point with ionization chamber because these ones are included in measurements of absorbed dose in the volume with a very small statistic risk. As a result, much time can be saved in the verifications process without any lack of quality. (Author)

  7. Comparison between IAEA/TRS-277 and IAEA/TRS-398 protocols for electron beam dosimetry with cylindrical ionization chambers; Comparacao entre os protocolos IAEA/TRS-277 e IAEA/TRS-398 para dosimetria em feixes de eletrons com camaras de ionizacao cilindricas

    Energy Technology Data Exchange (ETDEWEB)

    Souza, Roberto Salomon de

    2004-07-01

    With the purpose to guarantee an uncertainty in the dosimetry in radiation therapy, the International Atomic Energy Agency (IAEA) published in 1987 the Technical Reports Series (TRS) number 277 - Absorbed Dose Determination in Photon and Electron Beams - An International Code of Practice -, updated in 1997, when was published its second edition. In 2000 was published the TRS number 398 - Absorbed Dose Determination in External Beam Radiotherapy - An International Code of Practice for Dosimetry Based on Standards of Absorbed Dose to Water. The TRS number 398 brings a great conceptual change in relation to the basis of the formalism, before based on calibration factor in terms of air kerma, and now based on calibration factor in terms of absorbed dose in water. Since the TRS number 398 was published, the Secondary Standard Dosimetry Laboratories are calibrating the user's ionization chambers in terms of absorbed dose to water. However, nor all the clinics in Rio de Janeiro and Brazil have its ionization chambers calibrated in terms of absorbed dose to water. The National Cancer Institute, where the measurements were taken, was the first institution in the Rio de Janeiro to have its ionization chambers calibrated in terms of a new formalism. This work describes a comparison between dosimetry done with a cylindrical ionization chamber under electron beams utilizing the TRS number 277 formalism, based on air kerma, and the TRS number 398 formalism, based on absorbed dose to water, reporting the uncertainties variation of the dosimetry associated to each protocol. (author)

  8. Transferencia microquirúrgica hemipulpar del hallux en la reconstrucción del pulgar

    Directory of Open Access Journals (Sweden)

    José-Manuel Rodríguez-Vegas

    Full Text Available Introducción y Objetivo. La transferencia hemipulpar del hallux permite excelentes reconstrucciones de pulgar porque ofrece tejidos blandos de alta calidad, contorno pulpar casi normal y recuperación sensitiva satisfactoria sin necesidad de reorientación cortical. Además, a diferencia de colgajos locales y regionales, evita la agresión adicional a una mano ya lesionada, optimizando así el período de rehabilitación y el resultado final. El artículo revisa la experiencia del autor en la técnica y compara el procedimiento con otras opciones reconstructivas. Material y Método. Realizamos una revisión retrospectiva de 16 pacientes sometidos a transferencia hemipulpar del hallux en el período 2007-2013. Todos los pacientes fueron varones, con una edad media de 34 años y una alta demanda funcional (trabajadores manuales con traumatismo laboral. La técnica fue indicada en defectos mayores del 50% de la superficie pulpar del pulgar en pacientes sin factores de riesgo asociados relevantes. En 3 de los casos el defecto pulpar asoció un defecto óseo de falange distal de tamaño suficiente para aconsejar la transferencia combinada osteo-pulpar. Resultados. Quince de los 16 colgajos sobrevivieron sin incidencias postoperatorias. Un colgajo sufrió trombosis arterial con retirada del colgajo y cirugía adicional de cobertura. En 2 pacientes se realizó revisión estética del colgajo de manera diferida. Excepto en el caso fallido, todos los pacientes volvieron a su actividad laboral previa con excelente recuperación funcional de la mano. El cierre de la zona donante se realizó mediante cierre directo (12 pacientes o injerto cutáneo (4 pacientes. Ninguno de los pacientes, independientemente del tipo de cierre del defecto en el pie, refirió problemas en la deambulación o apariencia estética del pie. Conclusiones. La reconstrucción de defectos pulpares del pulgar mediante transferencia hemipulpar del hallux permite un excelente resultado

  9. Materiales de obturación radicular utilizados en dientes deciduos

    Directory of Open Access Journals (Sweden)

    Trejo-A

    2014-01-01

    Full Text Available La caries y traumatismos son las principales causas de urgencias en odontología pediátrica. Estas afecciones pueden llegar a ejercer un daño irreversible en el tejido pulpar comprometiendo la permanencia de los órganos dentarios afectados. Para limitar el daño pulpar y evitar la extracción de piezas temporales se han diseñado distintas técnicas que van desde recubrimientos pulpares hasta un tratamiento más radical como la pulpectomía. Ésta última consiste en la extirpación del tejido pulpar, la limpieza y desinfección del sistema de conductos y la obturación de los mismos. Diversos autores han descrito las características ideales que debe presentar un material obturador de conductos de la dentición temporal, en los que se incluyen actividad bactericida y bacteriostática, adecuado sellado tridimensional, biocompatibilidad y reabsorción del material a una velocidad similar que las raíces. Desde hace largo tiempo se han desarrollado diversos materiales para cumplir con las exigencias que demanda la técnica. Dentro de los primeros materiales surgidos con éste propósito se encuentran el Óxido de Zinc con Eugenol, Hidróxido de Calcio y materiales a base de yodoformo, con el tiempo surgieron combinaciones de estos materiales para aumentar las ventajas y disminuir las desventajas. De éstos, las pastas yodoformadas con Hidróxido de Calcio son los que han tenido mayor aceptación.

  10. Gross, computed tomographic and histological findings in mandibular cheek teeth extracted from horses with clinical signs of pulpitis due to apical infection.

    Science.gov (United States)

    Casey, M B; Pearson, G R; Perkins, J D; Tremaine, W H

    2015-09-01

    The most prevalent type of equine dental pulpitis due to apical infection is not associated with coronal fractures or periodontal disease. The pathogenesis of this type of pulpitis is not fully understood. Computed tomography (CT) is increasingly used to investigate equine dental disorders. However, gross, tomographic and histopathological changes in equine dental pulpitis have not been compared previously. To compare gross, CT and histological appearances of sectioned mandibular cheek teeth extracted from horses with clinical signs of pulpitis without coronal fractures or periodontal disease. To contribute to understanding the pathogenesis of equine dental pulpitis. Descriptive study using diseased and healthy teeth. Mandibular cheek teeth extracted from horses with clinical signs of pulpitis (cases), and from cadavers with no history of dental disease (controls), were compared using CT in the transverse plane at 1 mm intervals. Teeth were then sectioned transversely, photographed and processed for histopathological examination. Tomographs were compared with corresponding gross and histological sections. Cement, dentine and bone had similar ranges of attenuation (550-2000 Hounsfield Units, HU) in tomographs but could be differentiated from pulp (-400 to 500 HU) and enamel (> 2500 HU). Twelve discrete dental lesions were identified grossly, 10 of which were characterised histologically. Reactive and reparative dentinogenesis and extensive pulpar mineralisation, previously undescribed, were identified. Pulpar oedema, neutrophilic inflammation, cement and enamel defects, and reactive cemental deposition were also observed. The CT and pathological findings corresponded well where there was mineralised tissue deposited, defects in mineralised tissue, or food material in the pulpar area. Pulpar and dentinal necrosis and cement destruction, evident grossly and histologically, did not correspond to CT changes. Computed tomography is useful for identifying deposition and

  11. Determination of the correction factor for attenuation, dispersion and production of electrons (K{sub wall}) in the wall of graphite of a ionization chamber Pattern National Type CC01 in fields of gamma radiation of {sup 60}Co; Determinacion del factor de correccion por atenuacion, dispersion y produccion de electrones (K{sub wall}) en la pared de grafito de una Camara de Ionizacion Patron Nacional Tipo CC01 en campos de radiacion gamma de {sup 60} Co

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez R, J.T.; Morales P, J.; Cruz E, P. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    2001-12-15

    It was determined the Kwall correction factor for the wall of graphite of the chamber of the pattern national type CC01 series 133 for a radiation field Gamma of {sup 60}Co. With this end to measured the currents of ionization l(x) as function of the thickness of the wall of the chamber: X=4,8,12,16 and 20 mm.The mensurations for each thickness consisting of three groups, of sizes n = 30 or 60 data for each group; obtaining 8 complete groups of mensurations independent in eight different dates.The determinate the factor carried out using three regression models: lineal, logarithmic and quadratic, models that were tried to validate with the tests of : i) Shapiro-Wilk and {chi}{sup 2} for the normality of the entrance data ii) Tests of Bartlett for variances homogeneity among groups for each thickness iii) The tests of Duncan for the stockings among groups of each thickness, and iv) The tests of adjustment lack (LOF) for the models used. Nevertheless, alone the models of the group of corresponding mensurations at 01-03-2000 17-08-2001 they can be validated by LOF, but not for tests of normality and homogeneity of variances. Among other assignable causes of variation we have: i) The values captured by the system of mensuration of the variables of it influences: pressure, temperature and relative humidity don{sup t} belong together with the existent ones to the moment to capture the l(x). ii) The mensuration room presents flows of air, for what was suited o diminish their volume and to eliminate the flows of air. iii) A protocol settled down of taking of measures that it consisted in: - Pre-irradiation 5 minutes the chamber after the change of polarity and hood change, with a period of stabilization of 5 minutes after the pre-irradiation. - Pre-irradiation for 5 minutes before the taking of the readings, with the object of eliminating variation sources assigned to currents of escapes or due variations to transitory. iv) To realize corrections for relative humidity of agreement with the reference, [13). Nevertheless, our values of Kwall = 1.1035 {sub +} 0.08% and those reported by the manufacturer (Kwall=1.0136), both fixeds with a lineal model, defer a maximum of 0.1%. (Author)

  12. Antimicrobial Activity Of Some Indian Medicinal Plants | Dabur ...

    African Journals Online (AJOL)

    Water extracts of Acacia nilotica, Justicia zelanica, Lantana camara and Saraca asoca exhibited good activity against all the bacteria tested and the MIC was recorded in range of 9.375-37.5 μg/ml and 75.0-300.0 μg/ml against the bacterial and fungal pathogens, respectively. The other extracts of Phyllanthus urinaria, ...

  13. Tanzania Journal of Health Research - Vol 20, No 2 (2018)

    African Journals Online (AJOL)

    Socio-demographic determinants of dengue infection during an outbreak in Dar es Salaam City, Tanzania · EMAIL FREE FULL TEXT EMAIL FREE FULL TEXT DOWNLOAD FULL TEXT DOWNLOAD FULL TEXT. Neema Camara, Billy Ngasala, Germana Leyna, Ahmed Abade, Susan F. Rumisha, Ndekya M. Oriyo, Leonard ...

  14. C:\\Users\\AISA\\Desktop\\PDF 26(2)\\SENOU.xps

    African Journals Online (AJOL)

    AISA

    cadmium (Cd) des lixisols et vertisols a été évaluée en station. Les sols ... camara (Tea of Gambia) to accumulate heavy metals such as the Copper (Cu), Lead (Pb), Zinc (Zn) and. Cadmium ... métaux lourds, un procédé de phytoremédiation.

  15. Browse Title Index

    African Journals Online (AJOL)

    O Diallo, D Kanikomo, M Camara, M Dama, O Coulibaly, B Kane, MS Diarra, Y Sogoba, H Traore, SB Badiane ... S Ghroubi, I Miladi, S Mefteh, O Kharrat, M Guermazi, E Turki, C Mhiri, M Elleuch .... VB Patel, A Motala, C Connally, IDP Burger.

  16. Evaluation of the antidiarrhoeal activity of 80% methanol extract and ...

    African Journals Online (AJOL)

    Lantana camara L. is one of the medicinal plants traditionally used for the treatment of diarrhoea in Ethiopia. The aim of this study was to evaluate antidiarrhoeal activity of the 80% methanol extract and solvent fractions using mice model of diarrhoea. The 80% methanol extract was prepared by maceration and the fractions ...

  17. Alkaline protease from senesced leaves of invasive weed | Gaur ...

    African Journals Online (AJOL)

    step procedure involving ammonium sulfate precipitation and Sephadex G-250 gel permeation chromatography. The Sephadex-G-250 fraction of senesced leaves of Lantana camara showed 28.31 fold with a yield of 6.19%. The enzyme was ...

  18. (Gossypium hirsutum L.) CONTRE LA FUSARIOSE EFFECT ...

    African Journals Online (AJOL)

    EFFECT OFOLIGOSACCHARIDE FRACTION OF Fusarium oxysporum f. sp. vasinfectum ON COTTON PROTECTION (Gossypium hirsutum L.) AGAINST FUSARIUM WILT. R. A. N'GORAN épse BLA1,2, H. T. KOUAKOU2, F. K. Y. KONAN2, B. CAMARA1,. N. K. KOUASSI3 et D. KONE1. 1Laboratoire de Physiologie Végétale, ...

  19. Maternal and Child Health Services in the Context of the Ebola Virus ...

    African Journals Online (AJOL)

    Maternal and Child Health Services in the Context of the Ebola Virus Disease: Health Care Workers' Knowledge, Attitudes and Practices in Rural Guinea. Alexandre Delamou, Sidikiba Sidibé, Alison Marie El Ayadi, Bienvenu Salim Camara, Thérèse Delvaux, Bettina Utz, Abdoulaye II Toure, Sah D. Sandouno, Alioune ...

  20. A Cultural Resource Inventory of Portions of Lake Oahe, Corson County, South Dakota. Volume 1.

    Science.gov (United States)

    1987-07-01

    Dakota Twilight. Exposition Press, Hicksville, New York. Moran, S. R., M. Arndt, J. P. Bluemle, M. Camara, L. Clayton, M. M. Fenton , K. L. Harris, H. C...89 35 116 89 *Piscellaneous, a - smoking material. b - gum, c - sap. d - ceremonial or play. a - cosmetic . References: 6 - Gilmore 1919. 6 - Grinnell

  1. The Case of Exploding Lantana and the Lessons it Can Teach Us

    Indian Academy of Sciences (India)

    Invasive alien species are a growing conservation problem,worldwide. There are over 200 invasive plants in India, ofwhich Lantana camara is one of the best known. This articlelooks at a brief history of Lantana's arrival and spread acrossthe Indian subcontinent and the lessons that conservation biologistscan learn from it.

  2. Reference Aid Abbreviations in the Latin American Press

    Science.gov (United States)

    1977-08-30

    Argentino de Investigacion y Ensayo de Materiales CADIN Camara de Industrias de Nicaragua CADSE Comision Asesora de los Delitos Socio...IMC Industria de Materiales para la Construccion Instituto Mexicano del Cafe IMCE Instituto Mexicano de Comercio Exterior IMCIC Instituto...Generations (Gua) Revolucionarias NMU NNUU Naciones Unidas NOA Nueva Organizacion Anticomunista NON Nuevo Orden Nacional NORMETAL Empresa

  3. Biological activities of four essential oils against Anopheles gambiae ...

    African Journals Online (AJOL)

    The control of malaria is still a challenge partly due to mosquito's resistance to current available insecticides. The aim of this work was to evaluate the ovicidal, larvicidal and repellent activities of Lantana camara, Hyptis suaveolens, Hyptis spicigera and Ocimum canum essential oils against Anopheles gambiae s.l. ...

  4. The Custodial Parent-Child Relationship as a Mediating Factor in the Effects of Divorce on Children.

    Science.gov (United States)

    Rasmussen, Janis Carol

    Hess and Camara (1979) have shown that it is post-divorce family functioning, rather than family structure, that is most important in influencing the effects of divorce on children. A child's adjustment to divorce should be viewed as a developmental process rather than as a single event. Consequently, it is important to focus on the ways in which…

  5. 934 Snippets of Physics

    Indian Academy of Sciences (India)

    Young to old inflorescences of a colour variant of the pernicious weed Lantana camara. Freshly opened flowers are yellow and change gradu- ally to orange, scarlet and magenta. See p.1003. Eugene Paul Wigner. (1902–1995). ( Illustration: Subhankar Biswas ). Front Cover. Back Cover. 931. Classroom. An Easily Con-.

  6. Aerodynamics of Combat Aircraft Controls and of Ground Effects: Conference Proceedings of the Symposium of the Fluid Dynamics Panel Held in Madrid, Spain on 2-5 October 1989

    Science.gov (United States)

    1989-10-01

    iCtnan u c’. 23-) 0 Touchdown - Analyzed pordon of maneuver =-2907 ft 34G.ft --- 2000 ft 5700an ft - 7 T 0 Wesl camara e Eost coaera 516411 ., . -20 -0... drone sun Icaesile i’avliou me pose do fait do dfiveiuppessiit, nol soaffinric, de is ionerta unmite. Lu aims- Iloion do soi coosiste don,, A s’aifrsorbir

  7. High Power Microwaves (HPM) (les Micro-ondes de forte puissance (MFP).

    Science.gov (United States)

    1995-03-01

    admittances is less than zero. Varying the 1PM weapon source to blind C(I drones and satellites, intensity of the auxiliary magnetic field will...This camara provides an in-situ measurement and it has a dynamic range up to 1000 C. - Overview Video: One video camera was placed to record the entire

  8. La pyonephrose tuberculeuse a propos d'une observation a conakry ...

    African Journals Online (AJOL)

    OR Bah, LM Camara, S Guirassy, A Toure, MB Diallo, M Coulibaly. Abstract. No Abstract. Full Text: EMAIL FREE FULL TEXT EMAIL FREE FULL TEXT · DOWNLOAD FULL TEXT DOWNLOAD FULL TEXT · AJOL African Journals Online. HOW TO USE AJOL... for Researchers · for Librarians · for Authors · FAQ's · More about ...

  9. Final Environmental Assessment Implementation of the Integrated Natural Resources Management Plan for Avon Park Air Force Range Florida

    Science.gov (United States)

    2004-01-01

    divine nightshade (Solanum nigrescens) Coast sandspur (Cenchrus incertus) Three plants — tropical soda apple (Solanum viarum), cogon grass ( Imperata ...consequence on the APAFR ecosystem. However in the last 5 years, there has been an increase in the number of sites where cogon grass ( Imperata ...verticillata Hydrilla Hymenachne amplexicaulis West In mdian arsh grass Imperata cylindrica Cogon grass Lantana camara Lantana Ligustrum sinense Chinese

  10. NEWS: Conference diary

    Science.gov (United States)

    2000-03-01

    18 - 20 October 2000 Santa Fe, Argentina 5th Symposium of Investigators in Physics Education. Info: Ing Cristina Camara, GIDEAF Departamento de Fisica, Facultad de Ingenieria Quimica - UNL, Santiago del Estero 2829, 3000 Santa Fe, Argentina (ccamara@fiqus.unl.edu.ar or www.unl.edu.ar/sief5 )

  11. Sobre a morte da cobaya consecutiva á dupla Vagotomia

    Directory of Open Access Journals (Sweden)

    Miguel Ozorio de Almeida

    1920-01-01

    Full Text Available 1. A secção dos vagos na cobaya produza morte em prazos que variam de meia hora a algumas horas. 2. A morte se dá por intensas lesões pulmonares, caracterisadas por congestão e edema. 3. As cobayas introduzidas em camaras em que a atmosphera tem altas tensões de gaz carbonico, caem anesthesiadas ao fim de alguns segundos, seguindo-se logo depois a morte. Na autopsia, se encontram lesões pulmonares muito semelhantes ás que se verificam nas cobayas vagotomisadas. 4. Nas cobayas profundamente anesthesiadas pelo chloral, a sobrevida á vagotomia é muito maior que nas cobayas não anesthesiadas. Nesses casos a morte muitas vezes se dá quando o animal vem a despertar da anesthesia. 5. Foram feitas novas experiencias que demonstram produzir a novocaina uma interrupção completa de todas as fórmas de conductibilidade dos nervos. 6. Quando se produz a secção physiologica pela novocaina dos vagos na cobaya, observam-se modificações do typo respiratorio que se caracterisam por diminuição consideravel da frequencia e augmento da amplitude. A respiração não apresenta porém, o typo francamente dyspneico, istoé, ella não se faz com difficuldade. 7. A secção physiologia dos pneumogastricos permitte uma sobrevida muito maior que a secção cirurgica. 8. A morte nas condições da conclusão precedente se dá pelas mesmas lesões pulmonares que se encontram habitualmente depois de secção cirurgica, mas é produzida unicamente pela irritação dos pneumogastricos exercida pelas gotteiras de borracha e pelo algodão, depois que a novocaina é absorvida e que se dissipa a anesthesia local. 9. Quando se operam as secções dos vagos com irritações variaveis as sobrevidas são differentes. 10. A sangria immediata não tem effeito sobre o tempo de vida da cobaya vagotomisada. 11. A sangria tardia parece augmentar ligeiramente essa sobrevida. Todos os factos expostos neste trabalho demonstram: 1 De um lado a irritação sem secção dos

  12. A Comparison of Computed Tomographic, Radiographic, Gross and Histological, Dental, and Alveolar Findings in 30 Abnormal Cheek Teeth from Equine Cadavers.

    Science.gov (United States)

    Liuti, Tiziana; Smith, Sionagh; Dixon, Padraic M

    2017-01-01

    Equine cheek teeth disorders, especially pulpar/apical infections, can have very serious consequences due to the frequent extension of infection to the supporting bones and/or adjacent paranasal sinuses. Limited studies have assessed the accuracy of computed tomographic (CT) imaging in the diagnosis of these disorders, and no study has directly compared imaging and pathological findings of the alveoli of diseased equine cheek teeth. To validate the accuracy of CT and radiographic imaging of cheek teeth disorders by comparing CT and radiographic imaging, gross and histological findings in abnormal cheek teeth and their alveoli extracted from equine cadaver heads. Ex vivo original study. Fifty-four cadaver heads from horses with unknown histories that had died or been euthanized on humane grounds obtained from a rendering plant had radiography, CT imaging, and gross pathological examinations performed. Based on imaging and gross examination findings, 30 abnormal cheek teeth (26 maxillary and 4 mandibular) identified in 26 heads were extracted along with their dental alveoli where possible, and further CT imaging, gross, and histological examinations were performed. Eight maxillary cheek teeth (including four with attached alveolar bone) from these heads, that were normal on gross and CT examinations, were used as controls. Gross pathological and histological examinations indicated that 28/30 teeth, including two supernumerary teeth, had pulpar/apical infection, including pulpar and apical changes. A further supernumerary and a dysplastic tooth were also identified. Abnormal calcified tissue architecture was present in all three supernumerary and in the dysplastic tooth. CT imaging strongly indicated the presence of pulpar/apical infection in 27 of the 28 (96.4%) pulpar/apically infected teeth, including the presence of intrapulpar gas ( N  = 19/28), apical clubbing ( N  = 20), periapical halo ( N  = 4), root lysis or fragmentation ( N  = 7), and

  13. Assessing distributions of two invasive species of contrasting habits in future climate.

    Science.gov (United States)

    Panda, Rajendra Mohan; Behera, Mukunda Dev; Roy, Partha Sarathi

    2018-05-01

    Understanding the impact of climate change on species invasion is crucial for sustainable biodiversity conservation. Through this study, we try to answer how species differing in phenological cycles, specifically Cassia tora and Lantana camara, differ in the manner in which they invade new regions in India in the future climate. Since both species occupy identical niches, exploring their invasive potential in different climate change scenarios will offer critical insights into invasion and inform ecosystem management. We use three modelling protocols (i.e., maximum entropy, generalised linear model and generalised additive model) to predict the current distribution. Projections are made for both moderate (A1B) and extreme (A2) IPCC (Intergovernmental Panel on Climate Change) scenarios for the year 2050 and 2100. The study reveals that the distributions of C. tora (annual) and L. camara (perennial) would depend on the precipitation of the warmest quarter and moisture availability. C. tora may demonstrate physiological tolerance to the mean diurnal temperature range and L. camara to the solar radiation. C. tora may invade central India, while L. camara may invade the Western Himalaya, parts of the Eastern Himalaya and the Western Ghats. The distribution ranges of both species could shift in the northern and north-eastern directions in India, owing to changes in moisture availability. The possible alterations in precipitation regimes could lead to water stress, which might have cascading effects on species invasion. L. camara might adapt to climate change better compared with C. tora. This comparative analysis of the future distributions of two invasive plants with contrasting habits demonstrates that temporal complementarity would prevail over the competition. Copyright © 2017 Elsevier Ltd. All rights reserved.

  14. Influence of the restoration quality on the success of pulpotomy treatment: a preliminary retrospective study Influência da qualidade da restauração sobre o sucesso da pulpotomia: estudo preliminar

    Directory of Open Access Journals (Sweden)

    Flávio Fernando Demarco

    2005-03-01

    devido à exposição por cáries, sendo que todas as restaurações foram confeccionadas com resina composta. A idade dos pacientes variou de 15-50 anos (média de 23,9 anos e o tempo médio de acompanhamento das pulpotomias foi de 34,52 meses. Avaliações clínicas e radiográficas foram realizadas para a avaliação das pulpotomias. Ausência de hipersensibilidade, de alterações periapicais e teste de vitalidade pulpar positivo, eram as condições necessárias para que o tratamento fosse incluído no grupo "clinicamente favorável" utilizados para avaliar a condição clínica dos dentes tratados. Os critérios de avaliação clínica da USPHS foram utilizados para avaliar a qualidade das restaurações. Dez dentes (43,5% receberam o escore clinicamente favorável, 4 anteriores e 6 dentes posteriores. O critério falha foi atribuído a 13 dentes (56,5%, 4 dentes anteriores e 9 posteriores. Entre os dentes do grupo clinicamente favorável, 90% das restaurações foram classificadas como clinicamente satisfatória, enquanto 10% estavam insatisfatórias. No grupo onde houve falha, 77,8% das restaurações foram classificadas como insatisfatória enquanto 22,2% foram classificadas como satisfatórias. A análise estatística (Teste exato de Fisher demonstrou que existe uma associação estatisticamente significante entre a condição clínica da pulpotomia e a qualidade da restauração (p<0,05. Respeitando as limitações do estudo, é possível verificar que a qualidade da restauração pode ser um fator influente para uma condição clínica favorável de dentes tratados com pulpotomia. Estudos clínicos controlados são necessários para confirmar esses achados preliminares.

  15. Regeneración endodóntica con células madre

    Directory of Open Access Journals (Sweden)

    Elizabeth Santiago Dager

    2014-12-01

    Full Text Available Los procedimientos de regeneración del complejo pulpar están dirigidos a controlar la infección con un mínimo de instrumentos y abundante irrigación, para lo cual se han propuesto varios protocolos con ligeras variantes, sin consenso entre los autores; en el presente artículo se describen y analizan los 3 principales, con especial énfasis en los aspectos menos esclarecidos de un tratamiento fascinante con células madre en la rama de la endodoncia y cuyos avances proporcionan beneficios inestimables a los pacientes en quienes se aplica

  16. Quistes radiculares. Posibilidad de tratamiento endodóncico

    OpenAIRE

    Canalda Sahli, Carlos; Canalda Piera, Carlos

    1981-01-01

    Las principales complicaciones apicales y periapicales de la gan­grena pulpar, son la periodontitis apical crónica y el quiste radicular. Representan el 90 por ciento del total de lesiones apicales (BHASKAR). El 10 por ciento restante, corresponde a lesiones mucho menos habi­tuales: cementoma, absceso alveolar, quiste residual, tumor de células gigantes, etc. El tratamiento del granuloma y del quiste radicular ha evolucio­nado en el tiempo en un sentido más conservador. La existencia de una l...

  17. Granuloma periapical: tratamiento convencional. Reporte de un caso

    OpenAIRE

    Natalia Patricia Harris Ortega; Fernando Javier Guzman Lopez; Antonio Díaz Caballero

    2014-01-01

    Title: Periapical granuloma: conventional treatment. Case reportLos Granulomas radiculares son lesiones periapicales crónicas, consideradas secuelas directas de procesos infecciosos resultantes de la necrosis pulpar, extendiéndose hacia la región perirradicular. Los granulomas se pueden presentar por fallas en los tejidos duros, resultantes de caries, fracturas y procedimientos quirúrgicos. Se realizó tratamiento de endodoncia convencional con preparación invertida a paciente de 15 años con d...

  18. Rehabilitación oral con prótesis fija

    OpenAIRE

    Watanabe Velásquez, Romel; Salcedo Moncada, Doris; Ochoa Tataje, Julio; Horna Palomino, Hernán; Herrera Cisneros, Marco; Paz Fernández, Juan José

    2014-01-01

    El tratamiento fue realizado a un paciente de sexo masculino, de 58 años de edad, con antecedente de accidente de tránsito de hace dos años, con pérdida de dientes, fracturas, necrosis pulpar, y alteración del plano oclusal. Debido a la patología existente, se realizó un tratamiento multidisciplinario con Periodoncia, Endodoncia, Cirugía y Ortodoncia, y en lo referente a prótesis se colocaron espigos, coronas y puentes fijos. El tratamiento fue realizado en un lapso de 5 meses. This treatm...

  19. Tratamiento Endodóntico no Instrumentado en dientes deciduos

    OpenAIRE

    Perona-G; Mungi-S

    2014-01-01

    Teniendo en cuenta la complejidad del tratamiento pulpar en una pieza decidua y diversos factores que determinan el éxito clínico como son la anatomía de una pieza decidua, el proceso de reabsorción ya sea de origen fisiológico o por una infección odontogénica, la conducta del paciente, la técnica empleada y la pericia del operador; es de suma importancia que en la práctica odontopediátrica se tenga en cuenta ciertos procedimientos que aseguren la presencia del diente en boca hasta su exfolia...

  20. Valoración del tratamiento de la pulpotomía con MTA en dientes temporales vitales

    OpenAIRE

    Biedma Perea, María

    2014-01-01

    Texto completo descargado desde Teseo I. INTRODUCCIÓN La pérdida prematura de la pieza temporal puede conducir a maloclusiones, problemas estéticos, fonéticos y funcionales como hábitos, que pueden ser transitorios o permanentes.1 La pulpotomía es uno de los recursos para poder conservar los dientes deciduos, así estos actúan como mantenedores de espacios naturales hasta la erupción de la dentición permanente.2,3,4 El uso de materiales dentales como apósitos pulpares en el tratamiento de p...

  1. Pulpotomía con electrocauterio en pacientes con hemofilia A

    OpenAIRE

    Carbonell Rodriguez, Rosario

    2017-01-01

    Rehabilita la salud oral de un niños con Hemofilia A, empleando el Electrocauterio como una alternativa en la terapia pulpar, específicamente en la pulpotomía, para lo cual se realiza un minucioso examen clínico y anamnesis, que respaldados con exámenes complementarios, permite determinar el plan de tratamiento. La rehabilitación integral se llevó a cabo, previo consentimiento informado del padre, en sala de operaciones bajo anestesia general, debido a la condición sistémica del niño. Incl...

  2. Sperm immobilization by dental focus microorganisms.

    Science.gov (United States)

    Linossier, A; Thumann, A; Bustos-Obregon, E

    1982-01-01

    Focal infections and their ability to produce alterations in different tissues have been in dispute for long time. The purpose of this work was to observe "in vitro" the effect of an Escherichia coli filtrate obtained from open pulpar necrosis on human sperm motility. It was observed that the E. coli filtrate produced a loss in sperm motility. The immobilizating factor was studied and characterized as a heat-stable, resistant to lyophilization and non-dializable substance, which could via blood stream reach the male reproductive system and affect sperm motility.

  3. Técnicas de regeneração endodontica

    OpenAIRE

    Torres, João Carlos Moreira

    2011-01-01

    Trabalho apresentado à Universidade Fernando Pessoa como parte dos requisitos para obtenção do grau de Mestre em Medicina Dentária. Nos casos de necrose pulpar, a abordagem predominante tem sido, até então, o tratamento de canal radicular (em ápices maduros), a apexificação (para ápices imaturos), ou a extracção. No entanto, uma polpa viva é estritamente necessária para manter a homeostase e longevidade dentária. Uma forma ideal de tratamento, portanto, pode consistir numa abordagem regene...

  4. Urgencias por caries dental en pacientes de 4 a 12 años. Municipio Píritu, Venezuela. 2011

    OpenAIRE

    Mirabal Peón, Magaly Sofía; Tabares Alonso, Yadelis; Duque Reyes, María Victoria; Alfonso Biart, Belkis; Reyes Martín, Belkis; Villegas Rojas, Ivernis

    2014-01-01

    Se realizó un estudio observacional, descriptivo y transversal en los pacientes que acudieron a la clínica odontológica de Píritu, estado Falcón, Venezuela, en el período de junio a diciembre de 2011, y resultaron ser urgencia por caries dental. Con el objetivo de identificar el comportamiento de la misma, en las edades de 4 a 12 años, se clasificó la caries dental según localización y profundidad de las lesiones, se diagnosticó las patologías pulpares agudas encontradas con mayor frecuencia,...

  5. Abordagem clínica a canais radiculares calcificados e/ou atresiados

    OpenAIRE

    Veloso, Ana Catarina Rodrigues

    2017-01-01

    A Endodontia, ramo da Medicina Dentária, tem o objetivo de tratar patologias pulpares, permitindo assim, que as estruturas dentárias sejam mantidas em função na cavidade oral. O sucesso do tratamento depende de uma correta conformação, desinfeção e obturação canalar. Estes procedimentos podem estar comprometidos quando no canal existem calcificações, ou estes se encontram atresiados, impedindo o livre acesso apical. Localizar e manipular canais calcificados é um desafio pois a ...

  6. Morphological study of the pulp of Wistar rats molars under experimental occlusal interference

    OpenAIRE

    PENNA, Luiz Alberto Plácido [UNESP; RODE, Sigmar de Mello [UNESP

    2000-01-01

    As alterações morfológicas pulpares, decorrentes de um estímulo externo experimental (interferência oclusal), foram estudadas, em nível de microscopia de luz. Utilizaram-se restaurações de amálgama, em sobreoclusão nos primeiros molares superiores direitos de dez ratos Wistar, divididos em 3 grupos e sacrificados por perfusão transcardíaca com formol a 10%, aos 10, 20 e 30 dias. A avaliação foi feita nos molares inferiores direitos (lado experimental) e esquerdos (lado controle). As peças óss...

  7. Microbiologic investigation, quantification of endotoxin and antimicrobial susceptibility in primary endodontic infection and the salivary carriage of selected endodontic pathogens

    OpenAIRE

    Frederico Canato Martinho

    2007-01-01

    Resumo: O conhecimento das espécies microbianas assim como da suscetibilidade das mesmas à terapia endodôntica é importante para o sucesso do tratamento. Sendo assim, a proposta do presente estudo foi: 1) Analisar a microbiota endodôntica de dentes com necrose pulpar e presença de lesão periapical (C1) e correlacionar com os sinais e sintomas clínicos; 2) investigar mudanças microbiológicas após o preparo químico-mecânico (PQM) (C2); 3) investigar a presença de Entreococcus spp., Candida spp....

  8. Hybrid solar-electric oven construction prototype; Construccion de prototipo de horno hibrido solar-electrico

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez Roman, M. A; Pineda Pinon, J; Arcos Pichardo, A [CICATA, Santiago de Queretaro, Queretaro (Mexico)

    2013-03-15

    The oven construction consists of a solar collector system of cylindrical parabolic type, a heating through electrical resistance and a curing chamber. The warm fluid is air, which is injected into the chamber through forced draft. The temperature required in the system is within a range of 150 to 300 degrees Celsius. [Spanish] La construccion del horno consta de un sistema de captacion solar del tipo cilindrico parabolico, un sistema de calentamiento a traves de resistencias electricas y una camara de curado. El fluido a calentar es aire, el cual es inyectado dentro de la camara a traves de tiro forzado. La temperatura solicitada en el sistema es dentro de un rango de 150 a 300 grados centigrados.

  9. Imperfections study of the smoky quartz from Bahia by X-ray diffraction

    International Nuclear Information System (INIS)

    D'Aguiar Neto, M.M.F.

    1974-01-01

    X-ray diffraction techniques were used to study the type of point defects in Smoky quartz from Itambe and Vitoria da Conquista in Bahia. The power method, using the Seemann Bohlin camara (back refletion), was utilized in the analysis of the policrystals, while the monocrystals were studied by means of the precession camara. The positions occupied by the defects in the crystal net were calculated. The results show that while the defects of substitutional impurities predominate in the quartz from Itambe, in the quartz from Vitoria da Conquista the substitutional defects exist in comparable proportions that the interstital ones. Isochronous annealing curves, for both type of smoky quartz indicate an increase in the net parameter to temperature values above the annealing temperatures. Was formulated the hypothesis that providing a thermal energy greater than that of annealing is used, new interstitial defects would be created as a result of a thermic diffusion mechanism. (C.D.G.) [pt

  10. Agronomie Africaine - Vol 19, No 2 (2007)

    African Journals Online (AJOL)

    ... De L\\'utilisation Des Engrais Mineraux Dans Les Zones De Production Du Riz : Cas Du Centre-Ouest De La Côte D\\'ivoire · EMAIL FREE FULL TEXT EMAIL FREE FULL TEXT DOWNLOAD FULL TEXT DOWNLOAD FULL TEXT. JTB Gala, M Camara, A Assa, JZ Keli, 173-185. http://dx.doi.org/10.4314/aga.v19i2.1711 ...

  11. Neutron radiography imaging with 2-dimensional photon counting method and its problems

    International Nuclear Information System (INIS)

    Ikeda, Y.; Kobayashi, H.; Niwa, T.; Kataoka, T.

    1988-01-01

    A ultra sensitive neutron imaging system has been deviced with a 2-dimensional photon counting camara (ARGUS 100). The imaging system is composed by a 2-dimensional single photon counting tube and a low background vidicon followed with an image processing unit and frame memories. By using the imaging system, electronic neutron radiography (NTV) has been possible under the neutron flux less than 3 x 10 4 n/cm 2 ·s. (author)

  12. Order and Progress? The Evolution of Brazilian Defense Strategy

    Science.gov (United States)

    2014-03-01

    Peace and Security for Brazil” (Brazilian Ministry of Defense, 2008), 5–6, http://www.defesa.gov.br/projetosweb/ estrategia /arquivos...Politica-Nacional-de-Defesa-- Estrategia -Nacional-de-Defesa-e-Livro-Branco/. 31 the strategic ramifications of a militarily powerful Brazil.”101...noticia/12227/DEFESA---Camara-aprova- Politica-Nacional-de-Defesa-- Estrategia -Nacional-de-Defesa-e-Livro-Branco/. Clunan, Anne. “Globalization and the

  13. The History of the US Department of Defense Programs for the Testing, Evaluation, and Storage of Tactical Herbicides

    Science.gov (United States)

    2006-12-01

    sprayed from a 20-foot tower mounted on a pickup truck. The agent was applied in the evening under inversion conditions, and with a wind velocity between...delivering either 3 or 6 gallons of formulation per acre. The vegetation in the various plots ranged in height from 3-6 feet for Lantana ( Lantana ... camara ) to more than 60 feet for Silveroak (Grevillea robusta). Although the plots were accessible by ground vehicles, they were in areas isolated from

  14. Evaluation in vitro de l'activité antibactérienne de cinq plantes de la ...

    African Journals Online (AJOL)

    Dans le cadre de la valorisation de la pharmacopée africaine en général et camerounaise en particulier, des décoctions de feuilles de Ricinus communis, Harungana madagascariensis, Erigeron floribundus, Chromoleana odorata et Lantana camara ont été étudiées in vitro pour leur activité antibactérienne. Trois souches ...

  15. Fungal delignification of lignocellulosic biomass improves the saccharification of cellulosics.

    Science.gov (United States)

    Gupta, Rishi; Mehta, Girija; Khasa, Yogender Pal; Kuhad, Ramesh Chander

    2011-07-01

    The biological delignification of lignocellulosic feedstocks, Prosopis juliflora and Lantana camara was carried out with Pycnoporus cinnabarinus, a white rot fungus, at different scales under solid-state fermentation (SSF) and the fungal treated substrates were evaluated for their acid and enzymatic saccharification. The fungal fermentation at 10.0 g substrate level optimally delignified the P. juliflora by 11.89% and L. camara by 8.36%, and enriched their holocellulose content by 3.32 and 4.87%, respectively, after 15 days. The fungal delignification when scaled up from 10.0 g to 75.0, 200.0 and 500.0 g substrate level, the fungus degraded about 7.69-10.08% lignin in P. juliflora and 6.89-7.31% in L. camara, and eventually enhanced the holocellulose content by 2.90-3.97 and 4.25-4.61%, respectively. Furthermore, when the fungal fermented L. camara and P. juliflora was hydrolysed with dilute sulphuric acid, the sugar release was increased by 21.4-42.4% and the phenolics content in hydrolysate was decreased by 18.46 and 19.88%, as compared to the unfermented substrate acid hydrolysis, respectively. The reduction of phenolics in acid hydrolysates of fungal treated substrates decreased the amount of detoxifying material (activated charcoal) by 25.0-33.0% as compared to the amount required to reduce almost the same level of phenolics from unfermented substrate hydrolysates. Moreover, an increment of 21.1-25.1% sugar release was obtained when fungal treated substrates were enzymatically hydrolysed as compared to the hydrolysis of unfermented substrates. This study clearly shows that fungal delignification holds potential in utilizing plant residues for the production of sugars and biofuels.

  16. National pattern for the realization of the unit of the dose speed absorbed in air for beta radiation. (Method: Ionometer, cavity of Bragg-Gray implemented in an extrapolation chamber with electrodes of variable separation, exposed to a field of beta radiation of {sup 90}Sr/{sup 90}Y); Patron Nacional para la realizacion de la unidad de la rapidez de dosis absorbida en aire para radiacion beta. (Metodo: Ionometrico, cavidad de Bragg-Gray implementada en una camara de extrapolacion con electrodos de separacion variable, expuesta a un campo de radiacion beta de {sup 90}Sr/{sup 90}Y)

    Energy Technology Data Exchange (ETDEWEB)

    Alvarez R, M T; Morales P, J R [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    2001-01-15

    From the year of 1987 the Department of Metrology of the ININ, in their Secondary Laboratory of Calibration Dosimetric, has a patron group of sources of radiation beta and an extrapolation chamber of electrodes of variable separation.Their objective is to carry out of the unit of the dose speed absorbed in air for radiation beta. It uses the ionometric method, cavity Bragg-Gray in the extrapolation chamber with which it counts. The services that offers are: i) it Calibration : Radioactive Fuentes of radiation beta, isotopes: {sup 90}Sr/{sup 90}Y; Ophthalmic applicators {sup 9}0{sup S}r/{sup 90}Y; Instruments for detection of beta radiation with to the radiological protection: Ionization chambers, Geiger-Muller, etc.; Personal Dosemeters. ii) Irradiation with beta radiation of materials to the investigation. (Author)

  17. Equipment to evaluate in experimental form the thermal conductivity of the construction materials; Equipo para evaluar en forma experimental el coeficiente de conductividad termica de los materiales de construccion

    Energy Technology Data Exchange (ETDEWEB)

    Lopez C, Raymundo; Morales G, Juan R.; Diaz C, Alen; Lizardi R, Arturo [Universidad Autonoma Metropolitana-Azcapotzalco, Mexico, D. F. (Mexico); Vaca M, Mabel [Universidad Nacional Autonoma de Mexico, Mexico, D.F. (Mexico)

    2001-04-01

    An equipment meant to obtain the thermal conductivity coefficient was designed, constructed and evaluated. Convection losses in the experimental device were reduced by means of a vacuum chamber that wraps it. Conduction losses were minimized with the proper insulation. The tested materials are the most frequently used in the construction of buildings in Mexico, such as concrete, burnt brick, adobe and gypsum. Results observed are comparable to those reported in the literature. The essays done using the vacuum chamber produced values of thermal conductivity coefficient 3% lower than those obtained without using it. [Spanish] Se diseno, construyo y evaluo un equipo, con el cual se obtiene el coeficiente de conductividad termica en diversos materiales. En este se reducen las perdidas por conveccion, colocando una camara de vacio alrededor del conjunto de prueba. Las perdidas por conduccion se minimizan con un aislamiento adecuado. Los materiales evaluados son los que mas se utilizan en la construccion en Mexico, a saber, el concreto, el ladrillo cocido, el adobe y el yeso. Los valores obtenidos, sin considerar las perdidas por conveccion, se comparan con los de la literatura. Los ensayos utilizando la camara de vacio proporcionan valores del coeficiente de conductividad termica menores en 3% a los obtenidos sin dicha camara.

  18. A crise tripartite: entre revitalização do multilateralismo e regionalização da questão das FARC

    Directory of Open Access Journals (Sweden)

    PABLO P. SAMPEDRO ROMERO

    2010-10-01

    Full Text Available O presente artigo busca analisar os efeitos da recente crise diplomática sofrida pelos países na sub-região andina, devido às tensões nas relações entre Equador, Colômbia e Venezuela devido ao problema das FARC.

  19. Clay-brick firing in a high-temperature solar furnace

    Energy Technology Data Exchange (ETDEWEB)

    Villeda-Munoz, G. [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Instituto Politecnico Nacional, Unidad Queretaro, Queretaro (Mexico)]. E-mail: gvilledam@ipn.mx; Castaneda-Miranda, A. [Computation & amp; Mechatronic Studies Division, Universidad Politecnica de Queretaro, Queretaro (Mexico)]. E-mail: acastaneda@upq.edu.mx; Pless, R.C. [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Instituto Politecnico Nacional, Unidad Queretaro, Queretaro (Mexico)]. E-mail: rpless@ipn.mx; Vega-Duran, J.T. [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Instituto Politecnico Nacional, Unidad Queretaro, Queretaro (Mexico); Pineda-Pinon, J. [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Instituto Politecnico Nacional, Unidad Queretaro, Queretaro (Mexico)]. E-mail: jpinedap@ipn.mx

    2011-10-15

    The firing process for clay-brick production in traditional kilns generates atmospheric pollution when industrial and domestic scrap is used as fuel. An alternative is presented here, using the solar energy for clay-brick firing. We are developing a system for clay-brick firing to reach temperatures between 900 degrees Celsius and 1050 degrees Celsius; these temperatures are sufficiently high to fire bricks or similar ceramic products. The present paper describes the design and characterization of the components of a solar furnace for clay-brick firing with inner chamber dimensions of 0.48 * 0.61 * 0.64 m. To convey the sunlight to the firing chamber, a heliostat with nine 1 * 1 m mirrors is used to send the rays of the sun to an off-axis parabolic concentrator that focuses the light on the entrance of the firing chamber. The heliostat has a solar-tracking system which makes primary and secondary adjustments to assure that the reflected solar radiation always arrives at the concentrator. The firing chamber contains a prismatic cavity that absorbs the solar radiation to generate the heat which is needed for baking the bricks inside the firing chamber. [Spanish] El proceso de coccion para la produccion de tabiques de arcilla en hornos tradicionales genera contaminacion atmosferica cuando los desechos industriales y domesticos se usan como combustibles. Aqui se presenta una alternativa, utilizando la energia solar para la coccion de tabiques de arcilla. Estamos desarrollando un sistema para la coccion de tabiques de arcilla para alcanzar temperaturas entre 900 grados centigradosy 1050 grados centigrados; estas temperaturas son suficientemente altas para cocer tabiques o productos ceramicos similares. El presente articulo describe el diseno y caracterizacion de los componentes de un horno solar para la coccion de tabiques de arcilla con una camara con dimensiones internas de 0.48 * 0.61 *× 0.64 m. Para dirigir los rayos solares a la camara de coccion, un heliostato

  20. Biological response of pulps submitted to different capping materials Resposta biológica de polpas submetidas a diferentes materiais capeadores

    Directory of Open Access Journals (Sweden)

    André Luiz Fraga Briso

    2006-09-01

    Full Text Available Pulp capping is a procedure that comprises adequate protection of the pulp tissue exposed to the oral environment, aiming at the preservation of its vitality and functions. This study evaluated the response of the dental pulps of dog teeth to capping with mineral trioxide aggregate (MTA or calcium hydroxide P.A. For that purpose, 37 teeth were divided into two groups, according to the capping material employed. Two dogs were anesthetized and, after placement of a rubber dam, their pulps were exposed in a standardized manner and protected with the experimental capping materials. The cavities were then sealed with resin-modified glass ionomer cement and restored with composite resin. After sixty days, the animals were killed and the specimens were processed in order to be analyzed with optic microscopy. It was observed that MTA presented a higher success rate compared to calcium hydroxide, presenting a lower occurrence of infection and pulp necrosis.O capeamento pulpar é um procedimento que consiste na adequada proteção do tecido pulpar exposto ao meio oral, objetivando a preservação de sua vitalidade e suas funções. O objetivo deste trabalho foi observar a resposta da polpa dental de cães ao capeamento com o agregado de trióxido mineral (MTA ou hidróxido de cálcio P.A. Para tanto, 37 dentes foram divididos em dois grupos, de acordo com o material capeador utilizado. Dois cães foram anestesiados e após o isolamento absoluto do campo operatório, realizou-se exposição padronizada da polpa, proteção com os materiais capeadores testados e selamento das cavidades com cimento modificado de ionômero de vidro. Os dentes foram então restaurados com resina composta. Após sessenta dias, os animais foram sacrificados e as peças foram processadas para a análise microscópica dos dentes. Observou-se que o MTA apresentou maior índice de sucesso em relação ao hidróxido de cálcio, evidenciando menor ocorrência de infecção e necrose

  1. Antibacterial effect of root canal preparation and calcium hydroxide paste (Calen intracanal dressing in primary teeth with apical periodontitis Efeito antibacteriano do preparo biomecânico e do curativo de demora com pasta à base de hidróxido de cálcio (Calen em dentes decíduos com lesão periapical

    Directory of Open Access Journals (Sweden)

    Gisele Faria

    2005-12-01

    Full Text Available The aim of this study was to evaluate the antibacterial action of root canal mechanical preparation using 2.5% sodium hypochlorite as the irrigating solution and a calcium hydroxide paste as the antibacterial intracanal dressing in human primary teeth root canals with pulp necrosis and apical periodontitis by means of microbial culture. A total of 26 root canals of human primary teeth with pulp necrosis and apical periodontitis were used. Samples were collected before, 72h after biomechanical treatment and 72h after removal of the intracanal dressing. Comparison by Wilcoxon test showed that root canal mechanical preparation effectively eliminated all microorganisms in 20% of the root canals, and the intracanal dressing in 62.5%; however, the cumulative action of biomechanical treatment and intracanal dressing eliminated the microorganisms of 70% of the root canals (pO objetivo do presente estudo foi avaliar, por meio de cultura bacteriológica, a ação antibacteriana do preparo biomecânico utilizando como solução irrigadora o hipoclorito de sódio a 2,5% e da pasta Calen utilizada como curativo de demora em canais radiculares de dentes decíduos de humanos com necrose pulpar e lesão periapical. Foram selecionados 26 dentes decíduos de humanos portadores de necrose pulpar e lesão periapical. As colheitas microbiológicas foram efetuadas antes e 72 horas após o preparo biomecânico e 72 horas após a remoção do curativo de demora. A comparação por meio do teste de Wilcoxon mostrou que o preparo biomecânico foi eficaz na eliminação dos microrganismos dos canais radiculares em 20% dos casos e o curativo de demora em 62,5%, enquanto que a ação cumulativa do preparo biomecânico e do curativo de demora eliminou os microrganismos em 70,0% dos casos (p<0.001. Pôde-se concluir que o preparo biomecânico, isoladamente, apresentou resultados microbiológicos inferiores àqueles obtidos quando o mesmo foi associado ao curativo de demora

  2. Surveillance of multidrug resistance of two Gram-positive pathogenic bacteria in a teaching hospital and in vitro efficacy of 30 ethnomedicinal plants used by an aborigine of India

    Directory of Open Access Journals (Sweden)

    Debasmita Dubey

    2012-08-01

    Full Text Available Objective: To record hospital- and community-acquired accounts of multidrug resistance (MDR of two Gram-positive pathogens, Staphylococcus aureus (S. aureus and Enterococcus faecalis (E. faecalis, by surveillance, and to evaluate antibacterial potencies of 30 plants with information on ethnomedicinal uses for infectious ailments by the aborigine Kandha tribe of Kalahandi district, Odisha (India, against both pathogens. Methods: Over a period of 6 months bacteria/ strains of S. aureus and E. faecalis were isolated from clinical samples in a teaching hospital and their antibiograms were ascertained using 17 antibiotics of 9 different groups. S. aureus strains were further tested for confirmation if they were methicillin and vancomycin resistant, similarly, E. faecalis strains for vancomycin resistance. Concentrated aqueous and ethanolic extracts of leaves/ barks of 30 plants were used for monitoring their antimicrobial potencies, by the agar-well diffusion method, along with qualitative phytochemical analyses. Results: From the surveillance, both pathogens were found MDR and it was evident that the distribution of MDR strains was more in hospital-acquired than community-acquired samples. Both aqueous and ethanolic extracts of plants, Diospyrous melanoxylon, Woodfordia fruticosa (W. fruticosa, Oroxylum indicum (O. indicum, Dalbergia paniculata and Lantana camara had the most significant in vitro controlling capacity against MDR strains of both bacteria. Further, extracts of Holarrhena antidysenterica, Aspidopterys tomentosa and Argyreia speciosa had moderate antibacterial activities. Ethanolic extracts of L. camara, O. indicum and W. fruticosa contained all the phytochemicals, alkaloids, glycosides, terpenoids, reducing sugars, saponins, tannins, flavonoids and steroids, which could be attributed to the recorded significant antibacterial activity. Conclusions: S. aureus strains have been found as the most widely prevailing pathogens in nosocomial

  3. Evaluation of biomass of some invasive weed species as substrate for oyster mushroom (Pleurotus spp.) cultivation.

    Science.gov (United States)

    Mintesnot, Birara; Ayalew, Amare; Kebede, Ameha

    2014-01-15

    This study assessed the bioconversion of Agriculture wastes like invasive weeds species (Lantana camara, Prosopis juliflora, Parthenium hysterophorus) as a substrate for oyster mushroom (Pleurotus species) cultivation together with wheat straw as a control. The experiment was laid out in factorial combination of substrates and three edible oyster mushroom species in a Completely Randomized Design (CRD) with three replications. Pleurotus ostreatus gave significantly (p mushroom cultivation could contribute to alleviating ecological impact of invasive weed species while offering practical option to mitigating hunger and malnutrition in areas where the invasive weeds became dominant.

  4. Los Nuevos Términos Comerciales Internacionales -INCOTERMS- (Versión 2010 Y Su Aplicación En El Derecho Colombiano

    Directory of Open Access Journals (Sweden)

    Maximiliano Rodriguez

    2010-12-01

    Full Text Available Los INCOTERMS constituyen un conjunto de reglas internacionales para la interpretación de los usos comerciales más utilizados en las operaciones de comercio exterior. Este artículo constituye una vision panoramica de la última version de esos Terminos Comerciales, que son recopilados por la Camara de Comercio Internacional de Paris. Igualmente, se encarga de examinar las modificaciones que fueron introducidos en la nueva recopilacion de los terminos y su incidencia tanto dentro del ambito internacional como nacional.

  5. A review of the genus Orionis Shaw (Hymenoptera: Braconidae: Euphorinae) and first records of the genus from South America and the Oriental Region.

    Science.gov (United States)

    Bortoni, Marco Aurélio; Shimbori, Eduardo Mitio; Shaw, Scott Richard; Souza-Gessner, Carolina DA Silva; Penteado-Dias, Angélica Maria

    2016-12-16

    Orionis is a small Neotropical euphorine genus, currently in the tribe Perilitini. Although the biology of the genus is unknown, Orionis eximius (Muesebeck) was described from a single female specimen reared from a cocoon associated with Lantana camara. Here, we present a taxonomic revision of Orionis and the first records of the genus from South America and Thailand, with descriptions of three new species: O. brasiliensis sp. nov., O. ecuadoriensis sp. nov. and O. orientalis sp. nov. We also report the first record of O. eximius from South America (Ecuador). A revised key for the described species is presented.

  6. Comportamento do índice de refração do composto MgO em altas pressões

    OpenAIRE

    Naira Maria Balzaretti

    1988-01-01

    O presente trabalho envolve medidas do índice de refração no MgO como função de pressão, através de um micro-interferômetro deste material, colocado no interior de uma camara de alta pressão do tipo bigornas de diamante. In this work we measured the pressure dependence of the refractive index of MgO. A micro-interferometer of this material was inserted into a diamond anvil cell.

  7. Purpose of Introduction as a Predictor of Invasiveness among Introduced Shrubs in Rwanda

    Directory of Open Access Journals (Sweden)

    Jean Leonard Seburanga

    2015-01-01

    Full Text Available The introduced shrub flora in Rwanda was analyzed and the risk of invasion was assessed based on the species’ purposes of introduction. The results showed that more than half of invasive alien shrubs in Rwanda were introduced as ornamentals. They include Agave americana L., Bryophyllum proliferum Bowie ex Hook., Caesalpinia decapetala (Roth Alston, Lantana camara L., and Tithonia diversifolia (Hemsley A. Gray. However, these represented only 3.16% of the total number of introduced ornamental shrubs. At the time when the study was conducted, no introduced food crop had become invasive. Species introduced for purposes other than food or culinary use showed higher likelihood of becoming invasive.

  8. Anatomía de hoja y tallo de Verbenaceae medicinales empleadas en México

    OpenAIRE

    Calzada-Sánchez, Erika Viridiana; Aguilar-Rodríguez, Silvia; López-Villafranco, Ma. Edith; Aguilar-Contreras, Abigail

    2014-01-01

    Actualmente Aloysia triphylla, Lantana camara, Lippia dulcis, Verbena bipinnatifida, V. carolina y V. litoralis, se encuentran en lista de espera para su inclusión en la Farmacopea Herbolaria de los Estados Unidos Mexicanos. Con la finalidad de contribuir a dicha incorporación y a su identificación, en el presente estudio se compararon caracteres morfo-anatómicos de la hoja, tallo y ramas, de estas seis especies de Verbenaceae empleadas en la medicina tradicional mexicana. Se reconocen dos ti...

  9. La identidad militar americana en la guerra de Irak, democratización de la tecnología y la representación de la democracia

    Directory of Open Access Journals (Sweden)

    Diego Zavala Scherer

    2008-08-01

    Full Text Available This work addresses the problem of the war experience and itsdocumentary record by the figure of the soldier. In the second war in Iraq the soldiers have been converted into camara photographers and chroniclers of the conflict. Their identity, determined by their condition of participants, changes the poetic representation of documentary; invested with the new audiovisual technology, they are launched to record on behalf of values which we must question the embossing in such films.

  10. Analyses of guide update approaches for vector evaluated particle swarm optimisation on dynamic multi-objective optimisation problems

    CSIR Research Space (South Africa)

    Helbig, M

    2012-06-01

    Full Text Available not indicate whether Pareto-dominance is used to update guides. Therefore, it is assumed that the original version of VEPSO updates the local and global guides according to the particles? fitness with regards to only one objective, i.e. the objective... that were used to study the influence of guide update approaches on the performance of DVEPSO. Five benchmark functions were used of various DMOO Types, namely DIMP2 [10], FDA3Camara [11], dMOP2 [12], dMOP3 [12] and HE2 [13]. Various types of DMOOPs...

  11. Visual Problems in Night Operations (Problemes de Vision dans les Operations de Nuit)

    Science.gov (United States)

    1992-05-01

    conference proceedings (FR) Progrqbs r~cents concernant l05 aides au pilote clans I habitacle d’un aaroi’ef milltaire en operations. Nouveau drone ...allleurs) traitelit doe la sophistication des La firme isra~lienne tAt teste un nouveau drone appel6 ’Impact’. tacnes domanda~es aus pilotes d-avionS- doe...une camara do tala6vision A vision nocturne. 151 met aussl relations liomlme-macfline.ces syst~mws (lndiff~remesmnt dasignds au point une station

  12. Effect of hydrocarbons and nitrogen oxides on ozone formation in smog chambers exposed to solar irradiance of Mexico City

    Energy Technology Data Exchange (ETDEWEB)

    Sandoval F, J; Marroquin de la R, O; Jaimes L, J. L; Zuniga L, V. A; Gonzalez O, E; Guzman Lopez-Figueroa, F [Instituto Mexicano del Petroleo, Mexico, D.F. (Mexico)

    2001-01-01

    Outdoor smog chambers experiments were performed on air to determine the answer of maximum ozone levels, to changes in the initial hydrocarbons, HC, and nitrogen oxide NO{sub x}. These captive-air experiments under natural irradiation were carried out. Typically, eight chambers were filled with Mexico city air in the morning. In some of those chambers, the initial HC and/or Nox concentrations were varied by {+-}25% to {+-}50% by adding various combinations of a mixture of HC, clean air, or NO{sub x} (perturbed chambers). The O{sub 3} and NO{sub x} concentration in each chamber was monitored throughout the day to determine O{sub 3} (max). The initial HC and NO{sub x} concentration effects were determined by comparing the maximum ozone concentrations measured in the perturbed and unperturbed chambers. Ozone isopleths were constructed from the empirical model obtained of measurements of the eight chambers and plotted in a graph whose axe were the initial HC and NO{sub x} values. For the average initial conditions that were measured in Mexico City, it was found that the most efficient strategy to reduce the maximum concentration of O{sub 3} is the one that reduces NO{sub x}. [Spanish] Se realizaron experimentos de camaras de esmog con el aire de la ciudad de Mexico para determinar las respuestas de los niveles maximos de ozono a los cambios en las concentraciones iniciales de hidrocarburos, HC y oxido de nitrogeno, NO{sub x}. Por lo general, se llenaron 8 bolsas con aire matutino de la Ciudad de Mexico. En algunas camaras, las concentraciones iniciales fueron cambiadas de 25% a 50%, anadiendo varias concentraciones de una mezcla de HC, aire limpio y/o NO{sub x}. La concentracion de O{sub 3} y NO{sub x}, en cada camara, fueron monitoreadas a lo largo del dia para determinar el maximo de O{sub 3}. El efecto de los HC y el NO{sub x} fue determinado por comparacion del maximo de ozono formado en las camaras, que fueron perturbadas por adicion o reduccion de HC y/o Nox

  13. Dentine tubule infection and endodontic therapy implications.

    Science.gov (United States)

    Oguntebi, B R

    1994-07-01

    A critical review of the literature suggests that the microenvironment of dentinal tubules appears to favour the selection of relatively few bacterial types irrespective of the aetiology of the infection process; coronal dental caries or pulpar necrosis. These bacteria may constitute an important reservoir from which root canal infection and reinfection may occur following pulp necrosis or during and after endodontic treatment. Previous studies of this microflora have utilized microbiological culture techniques which need to be supplemented by those that allow in situ demonstration as well as identification of the bacteria. Newer treatment strategies that are designed to eliminate this microflora must include agents that can penetrate the dentinal tubules and destroy these microorganisms, since they are located in an area beyond the host defence mechanisms where they cannot be reached by systemically administered antimicrobial agents.

  14. [Thoracic aortic dissection revealed by systemic cholesterol embolism].

    Science.gov (United States)

    Braem, L; Paule, P; Héno, P; Morand, J J; Mafart, B; La Folie, T; Varlet, P; Mioulet, D; Fourcade, L

    2006-10-01

    Systemic cholesterol embolism is a rare complication of atherosclerosis, and has various presentations. Arterial catheterisms are a common cause. However, the association with an aortic dissection has been exceptionally reported. We report the observation of a 70 year-old man, with coronary artery disease, hypertension, diabetes and dyslipidemia. Six months before hospitalization, a coronary angioplasty was performed due to recurrent angina. The association of purpuric lesions on the feet, with acute renal failure confirmed cholesterol embolism syndrome. Transoesophageal echocardiography showed a dissection of the descending thoracic aorta associated with complex atheroma. The evolution was marked by the pulpar necrosis of a toe and by a worsening of the renal failure, requiring definitive hemodialysis. Further echographic control highlighted the rupture of the intimal veil of the dissection. Cholesterol embolism syndrome may reveal an aortic dissection in patients without thoracic symptoms. In such cases, transoesophageal echocardiography is a useful and non-invasive examination.

  15. Prevalence and distribution of odontogenic cysts in a Mexican sample. A 753 cases study.

    Science.gov (United States)

    Villasis-Sarmiento, Luis; Portilla-Robertson, Javier; Melendez-Ocampo, Arcelia; Gaitan-Cepeda, Luis-Alberto; Leyva-Huerta, Elba-Rosa

    2017-04-01

    Odontogenic cysts (OC) are the most frequent lesions of the jaws and their constant epidemiological update is necessary and indispensable. Therefore the principal objective of this report was To determine prevalence and clinical-demographical characteristics of OC in a Mexican sample. 753 cases of OC coming from the archive of a head and neck histopathological teaching service, from January 2000 to December 2013, were included. OC cases were re-assessed according 2005 WHO classification. Chi square test was used to establish possible associations ( p pulpar necrosis and impacted teeth, radicular cyst and dentigerous cyst could be prevenible. Therefore, it is necessary to establish preventive strategies to diminish dental decay and programs of prophylactic extractions of impacted teeth, to in consequence decrease the prevalence of odontogenic cysts. Key words: Cyst, dentigerous cyst, mexican, odontogenic cyst, radicular cyst.

  16. Evaluation of the permeability of the furcation area of deciduous molars conditioned with Er:YAG laser and cyanoacrylate Avaliação da permeabilidade da região da furca de molares decíduos condicionada com laser de Er:YAG e cianoacrilatos

    Directory of Open Access Journals (Sweden)

    Adriene Mara Souza Lopes-Silva

    2003-09-01

    Full Text Available The purpose of this study was to evaluate in vitro the dentin permeability of the deciduous pulp chamber floor after employing 2-octyl cyanoacrylate and Er:YAG laser. Twenty four deciduous molars were used, divided into four groups. After chemical-surgical preparation each group received a different treatment: Group 1 - control, without treatment; Group 2 - the floor of the pulp chamber was covered with a fine layer of 2-octyl cyanoacrylate; Group 3 - the floor of the pulp chamber was irradiated with Er:YAG laser (250 mJ, 10 Hz for 30 seconds, 80 J of energy and 320 pulses, and covered with a fine layer of 2-octyl cyanoacrylate; and Group 4 - the floor of the pulp chamber was irradiated with Er:YAG laser set at the parameters already described. After that the specimens received application of 0.5% methylene blue, for 15 minutes. The teeth were cut, photographed, and the digitalized images were analyzed using the ImageLab program. The results obtained were submitted to statistical analysis. Group 4 (Er:YAG presented the largest averages in percentage of dye penetration area (19.5%, followed by Group 1 (11.1%, Group 3 (1.4% and Group 2 (0.2%. The experimental model allowed to conclude that the specimens conditioned with 2-octyl cyanoacrylate (Group 2 and Er:YAG laser associated to 2-octyl cyanoacrylate (Group 3 presented a decrease in permeability, and the specimens treated with Er:YAG laser (Group 4 presented an increase in permeability of the analyzed area.A proposta do presente experimento foi avaliar in vitro a permeabilidade da dentina no assoalho da câmara pulpar de dentes decíduos com o emprego do 2-octil cianoacrilato e laser de Er:YAG. Foram empregados 24 molares decíduos, divididos em quatro grupos. Após preparo químico-cirúrgico, cada grupo recebeu um tratamento diferente: Grupo 1 - controle, sem tratamento; Grupo 2 - o assoalho da câmara pulpar foi coberto com uma fina camada de 2-octil cianoacrilato; Grupo 3 - o assoalho da c

  17. Análise da presença do canal cavo-inter-radicular em molares: estudo in vitro = ‘In vitro’ analysis of acessory foramina in molar teeth

    Directory of Open Access Journals (Sweden)

    Cunha, Fernanda Silveira da

    2005-01-01

    Full Text Available Evidências significativas sugerem a inter-relação existente entre a região de furca de dentes multirradiculados com o desenvolvimento de lesões endo-periodontais, principalmente, quando da presença do canal cavo-inter-radicular. Com o objetivo de compreender os mecanismos envolvidos na etiopatogenia de tais doenças periodontais, assim como propiciar o diagnóstico e o tratamento precoces, buscou-se melhor caracterizar essa região dando ênfase à morfologia do assoalho da câmara pulpar. Para este estudo foram selecionados 42 molares humanos extraídos, sendo 21 superiores e 21 inferiores. Após realizadas as aberturas coronárias e localizadas as entradas dos canais radiculares, os dentes tiveram parte das porções coronária e radicular cortada perpendicularmente ao longo do seu eixo, com o auxílio de disco de carburundum. Depois de uma criteriosa limpeza dos espécimes, esses foram secos em câmara de ponto crítico, sendo, a seguir, preparados para análise em microscópio eletrônico de varredura (Philips®, modelo XL30, Holanda. Os dados foram analisados através do Teste U de Mann- Whitney e do teste Qui-quadrado. Com base nos resultados obtidos e de acordo com a literatura pertinente, pôde-se verificar que: 1. o diâmetro e o número de túbulos dentinários encontrados por mm2 assim como a presença de foraminas no assoalho da câmara pulpar sugerem a permeabilidade dessa região; 2. o diâmetro maior de algumas foraminas identifica a presença do canal cavo-inter-radicular

  18. Study in vitro of dental enamel irradiated with a high power diode laser operating at 960 nm: morphological analysis of post-irradiation dental surface and thermal effect analysis in pulp chamber due to laser application

    International Nuclear Information System (INIS)

    Quinto Junior, Jose

    2001-01-01

    Objectives: This study examines the structural and thermal modifications induced in dental enamel under dye assisted diode laser irradiation. The aim of this study is to verify if this laser-assisted treatment is capable to modify the enamel surface by causing fusion of the enamel surface layer. At the same time, the pulpal temperature rise must be kept low enough in order not to cause pulpar necrosis. To achieve this target, it is necessary to determine suitable laser parameters. As is known, fusion of the enamel surface followed by re-solidification produce a more acid resistant layer. This surface treatment is being researched as a new method for caries prevention. Method and Materials: A series of fourteen identically prepared enamel samples of human teeth were irradiated with a high power diode laser operating at 960 nm and using fiber delivery. Prior to irradiation, a fine layer of cromophorous ink was applied to the enamel surface. In the first part of the experiment the best parameter for pulse duration was determined. In the second part of the experimental phase the same energy density was used but with different repetition rates. During irradiation we monitored the temperature rise in the pulpal cavity. The morphology of the treated samples was analysed under SEM. Results: The morphology of the treated samples showed a homogeneously re-solidified enamel layer. The results of the temperature analysis showed a decrease of the pulpal temperature rise with decreasing repetition rate. Conclusion: With the diode laser it is possible to cause morphological alterations of the enamel surface, which is known to increase the enamel resistance against acid attack, and still maintain the temperature rise in the pulpar chamber below damage threshold. (author)

  19. Fracture resistance and failure pattern of teeth submitted to internal bleaching with 37% carbamide peroxide, with application of different restorative procedures Resistência à fratura e padrão de falha de dentes submetidos ao clareamento interno com peróxido de carbamida a 37%, com aplicação de diferentes procedimentos restauradores

    Directory of Open Access Journals (Sweden)

    Gerson Bonfante

    2006-08-01

    Full Text Available OBJECTIVE: This study investigated the compressive fracture strength and failure pattern in premolars submitted to endodontic treatment and internal bleaching with 37% carbamide peroxide for 21 days, with application of different restorative procedures. MATERIAL AND METHODS: Six groups were employed (n = 10: 1 non-bleached teeth and pulp chamber sealed with IRM; 2 bleached teeth and pulp chamber sealed with IRM; 3 bleached teeth and pulp chamber filled with light cured composite resin; 4 bleached teeth, root canals prepared at 10mm, filling of the root canal and pulp chamber with IRM; 5 bleached teeth, root canals prepared at 10mm, luting of prefabricated metallic post with zinc phosphate and pulp chamber sealed with composite resin; 6 bleached teeth, root canals prepared at 10mm, luting of glass fiber post with resin cement and pulp chamber sealed with composite resin. After 24-hour storage in distilled water, the specimens were submitted to compressive fracture strength testing in a universal testing machine. RESULTS: The following values were found: Group 1 - 56.23kgf; Group 2 - 48.96kgf; Group 3 - 53.99kgf; Group 4 - 45.72kgf; Group 5 - 54.22kgf; Group 6 - 60.12kgf. The analysis of variance did not reveal statistically significant difference between groups (pOBJETIVO: O objetivo do estudo foi investigar a resistência à fratura sob compressão e padrão de falha de pré-molares tratados endodonticamente e clareados internamente por 21 dias com peróxido de carbamida a 37%, aplicando-se diferentes procedimentos restauradores. MATERIAL E MÉTODOS: O objetivo deste estudo foi investigar a resistência à fratura sob compressão e padrão de falha de pré-molares unirradiculares tratados endodonticamente e clareados internamente com peróxido de carbamida a 37%. Foram constituídos 6 grupos (n = 10: 1 dentes sem clareamento e câmara pulpar vedada com IRM; 2 dentes clareados e câmara pulpar vedada com IRM; 3 dentes clareados e câmara pulpar

  20. Nectar Meals of a Mosquito-Specialist Spider

    Directory of Open Access Journals (Sweden)

    Josiah O. Kuja

    2012-01-01

    Full Text Available Evarcha culicivora, an East African jumping spider, is known for feeding indirectly on vertebrate blood by actively choosing blood-carrying mosquitoes as prey. Using cold-anthrone tests to detect fructose, we demonstrate that E. culicivora also feeds on nectar. Field-collected individuals, found on the plant Lantana camara, tested positive for plant sugar (fructose. In the laboratory, E. culicivora tested positive for fructose after being kept with L. camara or one of another ten plant species (Aloe vera, Clerodendron magnifica, Hamelia patens, Lantana montevideo, Leonotis nepetaefolia, Parthenium hysterophorus, Ricinus communis, Senna didymobotrya, Striga asiatica, and Verbena trivernia. Our findings demonstrate that E. culicivora acquires fructose from its natural diet and can ingest fructose directly from plant nectaries. However, experiments in the laboratory also show that E. culicivora can obtain fructose indirectly by feeding on prey that have fed on fructose, implying a need to consider this possibility when field-collected spiders test positive for fructose. In laboratory tests, 53.5% of 1,215 small juveniles, but only 3.4% of 622 adult E. culicivora, left with plants for 24 hours, were positive for fructose. These findings, along with the field data, suggest that fructose is especially important for early-instar juveniles of E. culicivora.

  1. Modeling of an atomizer for two fluids; Modelacion de un atomizador de dos fluidos

    Energy Technology Data Exchange (ETDEWEB)

    Tapia Ramirez, Zoili [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1998-09-01

    The work reported in this article presents the results of the effort to improve the basic understanding of the flow structure that is formed in a two fluid sprayer before and after the interaction between the sprayed fluid and the spraying fluid. The images in the interior of the mixing chamber of the atomizer are shown, which were taken with a high velocity video camera. Also the results of the numerical simulation of the internal flow obtained by means of a package of commercial modeling are shown. [Espanol] El trabajo reportado en este articulo presenta los resultados del esfuerzo por mejorar el entendimiento basico de la estructura del flujo que se forma en un atomizador de dos fluidos antes y despues de la interaccion entre el fluido atomizado y el fluido atomizante. Se muestran imagenes del flujo en el interior de la camara de mezclado del atomizador, las cuales fueron tomadas con una camara de video de alta velocidad. Tambien se incluyen los resultados de la simulacion numerica del flujo interno obtenidas por medio de un paquete de modelacion comercial.

  2. High resolution reconstruction of monthly autumn and winter precipitation of Iberian Peninsula for last 150 years.

    Science.gov (United States)

    Cortesi, N.; Trigo, R.; González-Hidalgo, J. C.; Ramos, A.

    2012-04-01

    Precipitation over Iberian Peninsula (IP) presents large values of interannual variability and large spatial contrasts between wet mountainous regions in the north and dry regions in the southern plains. Unlike other European regions, IP was poorly monitored for precipitation during 19th century. Here we present a new approach to fill this gap. A set of 26 atmospheric circulation weather types (Trigo R.M. and DaCamara C.C., 2000) derived from a recent SLP dataset, the EMULATE (European and North Atlantic daily to multidecadal climate variability) Project, was used to reconstruct Iberian monthly precipitation from October to March during 1851-1947. Principal Component Regression Analysis was chosen to develop monthly precipitation reconstruction back to 1851 and calibrated over 1948-2003 period for 3030 monthly precipitation series of high-density homogenized MOPREDAS (Monthly Precipitation Database for Spain and Portugal) database. Validation was conducted over 1920-1947 at 15 key site locations. Results show high model performance for selected months, with a mean coefficient of variation (CV) around 0.6 during validation period. Lower CV values were achieved in western area of IP. Trigo, R. M., and DaCamara, C.C., 2000: "Circulation weather types and their impact on the precipitation regime in Portugal". Int. J. Climatol., 20, 1559-1581.

  3. Repellent plants provide affordable natural screening to prevent mosquito house entry in tropical rural settings--results from a pilot efficacy study.

    Directory of Open Access Journals (Sweden)

    Frank C Mng'ong'o

    Full Text Available Sustained malaria control is underway using a combination of vector control, prompt diagnosis and treatment of malaria cases. Progress is excellent, but for long-term control, low-cost, sustainable tools that supplement existing control programs are needed. Conventional vector control tools such as indoor residual spraying and house screening are highly effective, but difficult to deliver in rural areas. Therefore, an additional means of reducing mosquito house entry was evaluated: the screening of mosquito house entry points by planting the tall and densely foliated repellent plant Lantana camara L. around houses. A pilot efficacy study was performed in Kagera Region, Tanzania in an area of high seasonal malaria transmission, where consenting families within the study village planted L. camara (Lantana around their homes and were responsible for maintaining the plants. Questionnaire data on house design, socioeconomic status, malaria prevention knowledge, attitude and practices was collected from 231 houses with Lantana planted around them 90 houses without repellent plants. Mosquitoes were collected using CDC Light Traps between September 2008 and July 2009. Data were analysed with generalised negative binomial regression, controlling for the effect of sampling period. Indoor catches of mosquitoes in houses with Lantana were compared using the Incidence Rate Ratio (IRR relative to houses without plants in an adjusted analysis. There were 56% fewer Anopheles gambiae s.s. (IRR 0.44, 95% CI 0.28-0.68, p<0.0001; 83% fewer Anopheles funestus s.s. (IRR 0.17, 95% CI 0.09-0.32, p<0.0001, and 50% fewer mosquitoes of any kind (IRR 0.50, 95% CI 0.38-0.67, p<0.0001 in houses with Lantana relative to controls. House screening using Lantana reduced indoor densities of malaria vectors and nuisance mosquitoes with broad community acceptance. Providing sufficient plants for one home costs US $1.50 including maintenance and labour costs, (30 cents per person. L

  4. Casca de arroz e palhada de soja na compostagem de carcaças de frangos de corte = Rice husks and soy straw as substrate for composting of broiler carcasses

    Directory of Open Access Journals (Sweden)

    Paulo Giovanni de Abreu

    2011-01-01

    Full Text Available Avaliou-se a atuacao da casca de arroz e da palhada de soja como substrato para compostagem de carcaca de frangos de corte, observando a degradacao dos dois substratos e das carcacas pelo monitoramento da temperatura, peso das carcacas e dos substratos e analise fisicoquimica do produto final. As camaras foram montadas com carcacas de 10 aves recem abatidas, com quatro repeticoes no tempo. Instalou-se em cada camara um termopar para registro da temperatura. O substrato e as carcacas foram pesadas separadamente, no inicio, aos 15 e aos 30 dias de compostagem. Ao final de cada periodo, foram realizadas analises fisico-quimica de amostras de cada camara, avaliando-se o pH e os teores de materia seca, cinzas, P, N, K, Cu, Zn, Mn, Fe e carbono organico. Concluiu-se que a palhada de soja pode ser usada como alternativa para substrato de compostagem de carcacas de aves, atendendo a relacao C/N exigida pela legislacao ao final da terceira reutilizacao. A casca de arroz, da mesma forma, pode ser utilizada na compostagem de carcacas de aves, porem reutilizada por maior numero de vezes. A decomposicao das carcacas foi significativamente maior, em percentual, na palhada de soja aofinal do quarto periodo de compostagem (p „Tƒn0,05.The performance of rice husks and of soy straw were evaluated as substrate for on-farm poultry carcass composting, observing the degradation of the two substrate and of the carcasses through monitoring the temperature, weight of the carcasses and of the substrate and physiochemical analysis of the final product. The piles were arranged with carcasses of 10 recently slaughtered birds, with four repetitions in time. A thermo pair was installed in each pile to register the temperature. The substrate and the carcasses were weighed separately, in the beginning, day 15 and day 30 of composting. At the end of each period, the physiochemical analysis of samples were made from each pile, evaluating the pH, the dry material, ashes, P, N

  5. Arroz: composição e características nutricionais

    OpenAIRE

    Walter,Melissa; Marchezan,Enio; Avila,Luis Antonio de

    2008-01-01

    Devido à importância do arroz na dieta, sua composição e suas características nutricionais estão diretamente relacionadas à saúde da população. Este cereal constitui-se em fonte de energia, devido ao alto teor de amido, fornecendo também proteínas, lipídios, vitaminas e minerais. O presente trabalho de revisão objetivou examinar a composição do arroz, suas características nutricionais e o melhoramento destas através da genética. São observadas variações na composição do arroz, tanto devido ao...

  6. Estudo das interações polifenol-proteína e das reações de escurecimento não-enzimático para o processamento de cajuína

    OpenAIRE

    Damasceno, Leandro Fernandes

    2007-01-01

    O caju, frutífera originária do Nordeste brasileiro é utilizado para produção de suco devido ao seu sabor e ser rico em vitamina C. Entretanto, sua aceitação é limitada devido a sua adstringência. Um produto bastante apreciado pelo seu sabor característico, refrescante e não adstringente, devido à remoção dos taninos, é a cajuína. A cajuína é uma bebida elaborada a partir do suco de caju clarificado e esterilizada no interior de garrafas, apresentando uma coloração amarelo-âmbar. Ela di...

  7. ANÁLISIS DESCRIPTIVO DE LA RESPUESTA DEL COMPLEJO PULPO-DENTINAL DE ÓRGANOS DENTALES DE UNA POBLACIÓN PREHISPÁNICA CAZADORA-RECOLECTORA

    Directory of Open Access Journals (Sweden)

    María Clemencia Vargas Vargas

    2011-12-01

    un color amarillo, las superficies oclusales e incisales se presentan lisas. Ninguna de las piezas dentarias presentó signos clínicos de caries. Respecto al examen radiográfico, los datos obtenidos confirmaron los hallazgos clínicos. Conclusiones: El desgaste dental es la característica clínica que más se presentó, posiblemente asociado al consumo de alimentos fibrosos y a la fuerza imprimida en la acción masticatoria, además es agravado por partículas abrasivas que se adherían a los alimentos, durante la maceración con elementos líticos. Las estructuras dentales más afectadas por el desgaste dental corresponden al esmalte y a la dentina. En este estudio no se encontró un porcentaje relevante de casos de exposición pulpar por desgaste dental, a pesar que la edad aproximada y la esperanza de vida al nacer era de más o menos 35 años. Posiblemente la exposición pulpar no se daba, gracias a la producción de dentina secundaria que esclerosaba las cámaras pulpares.

  8. Estudo morfológico da polpa de molares de ratos Wistar frente a uma oclusão traumática experimental Morphological study of the pulp of Wistar rats molars under experimental occlusal interference

    Directory of Open Access Journals (Sweden)

    Luiz Alberto Plácido PENNA

    2000-06-01

    Full Text Available As alterações morfológicas pulpares, decorrentes de um estímulo externo experimental (interferência oclusal, foram estudadas, em nível de microscopia de luz. Utilizaram-se restaurações de amálgama, em sobreoclusão nos primeiros molares superiores direitos de dez ratos Wistar, divididos em 3 grupos e sacrificados por perfusão transcardíaca com formol a 10%, aos 10, 20 e 30 dias. A avaliação foi feita nos molares inferiores direitos (lado experimental e esquerdos (lado controle. As peças ósseas após descalcificação em solução de EDTA associada às microondas, seguiram técnica histológica de rotina e coloração por hematoxilina-eosina e tricrômico de Mallory. Verificou-se no lado controle uma reação intensa caracterizada por um posicionamento atípico dos odontoblastos, seguida pelo aparecimento de cálculos pulpares e posteriormente por uma aparente e uniforme acomodação tecidual em toda a polpa, com moderada incidência de fibras colágenas. No lado experimental, as alterações foram similares parecendo, porém, aumentar com o tempo, principalmente aos 30 dias, onde a imagem histológica era semelhante à do lado controle aos 10 dias. Os resultados obtidos permitiram concluir que a interferência oclusal provocou alterações no tecido conjuntivo pulpar tanto no lado experimental como no controle e que as mesmas foram proporcionais à direção dos movimentos mandibulares.Pulpal morphological alterations in mandibular molars of rats, resulting from an experimental external stimulus (occlusal interference, were studied using light microscopy. We placed amalgam restorations in supraocclusion in the right superior first molars of 10 Wistar rats divided into three groups, which were sacrificed by transcardiac perfusion with 10% formalin, after 10, 20 and 30 days. The evaluation of the right (experimental side and left (control side inferior molars was made after decalcification of the bony specimens with EDTA solution

  9. ANÁLISIS DESCRIPTIVO DE LA RESPUESTA DEL COMPLEJO PULPO-DENTINAL DE ÓRGANOS DENTALES DE UNA POBLACIÓN PREHISPÁNICA CAZADORA-RECOLECTORA

    Directory of Open Access Journals (Sweden)

    María Clemencia Vargas Vargas

    2012-01-01

    a la dentina. En este estudio no se encontró un porcentaje relevante de casos de exposición pulpar por desgaste dental, a pesar que la edad aproximada y la esperanza de vida al nacer era de más o menos 35 años. Posiblemente la exposición pulpar no se daba, gracias a la producción de dentina secundaria que esclerosaba las cámaras pulpares.

  10. Usina fotovoltaica de 1 MWp para suprimento de veículos elétricos : estimativa da frota atendida, logística de abastecimento e emissões de CO2 evitadas

    OpenAIRE

    Karina Maretti Strangueto

    2012-01-01

    Resumo: Desde a Revolução Industrial, as atividades desenvolvidas pelo homem têm provocado um crescimento maciço das emissões de gases de efeito estufa e poluentes para a atmosfera da Terra, devido, entre outros fatores, à constante e crescente necessidade de energia. Um grande esforço vem sendo realizado nas últimas décadas para a redução dessas emissões, com especial atenção ao setor de transporte, principalmente pelos efeitos provocados nas populações das grandes cidades devido à concentra...

  11. Uso de liquens como biomonitores na avaliação da contribuição de fontes poluidoras

    OpenAIRE

    Camila de Oliveira Viana

    2010-01-01

    Os níveis de poluição atmosférica, em geral, são avaliados pela medida direta dos principais poluentes através, por exemplo, da coleta de aerossóis e particulados em filtros de ar. Entretanto, essa metodologia apresenta dificuldades devido ao custo elevado de aquisição dos equipamentos coletores de ar, custos de manutenção e de coleta e também devido ao grande número de pontos de amostragens necessários para o monitoramento. Uma alternativa é aplicar o biomonitoramento, que é o...

  12. A autoapresentação dos portugueses nas plataformas de online dating

    OpenAIRE

    Sepúlveda, Rita Adriana Couto Ferreira Corrêa de

    2016-01-01

    Mestrado em Comunicação, Cultura e Tecnologias de Informação Tem-se vindo a registar um crescimento dos serviços de online dating, quer na quantidade como na diversidade de plataformas disponíveis no mercado. Por um lado, devido a características próprias do meio onde se disponibilizam, oferecem uma maior facilidade e rapidez na obtenção de resultados por outro, devido a mudanças sociais na dinâmica de comunicação e relacionamento mais pessoas recorre a estes. Nesta perspetiva,...

  13. Transformações do nitrogênio no sistema solo-planta após aplicação de herbicidas

    OpenAIRE

    Virginia Damin

    2009-01-01

    A utilização de herbicidas pode modificar a dinâmica do nitrogênio nos agroecossistemas e, como consequência, a disponibilidade do nutriente às plantas e microrganismos. Estas mudanças podem ocorrer devido às alterações fisiológicas ocasionadas nas plantas e/ou devido ao efeito dos herbicidas na atividade e composição da comunidade microbiana do solo, a qual tem funções importantes nas transformações do N no sistema. Neste contexto, objetivou-se com este trabalho de tese: 1- avaliar as perdas...

  14. Potencial anti-Sporothrix spp. de plantas da família lamiaceae

    OpenAIRE

    Stefanie Bressan Waller

    2015-01-01

    As propriedades terapêuticas das plantas medicinais são cada vez mais estudadas, principalmente devido aos crescentes casos de resistência antimicrobiana, como observado em cepas do Complexo Sporothrix. As plantas da família Lamiaceae são conhecidas por suas propriedades antifúngicas, entretanto, são escassos seus estudos contra agentes causadores da esporotricose. Devido ao potencial promissor dessas plantas, objetivou-se (1) avaliar a atividade anti-Sporothrix spp. in vitro de Origanum vulg...

  15. Transtorno obsessivo compulsivo em crianças e adolescentes: revisão de literatura e abordagem odontológica

    OpenAIRE

    Marinho, Erika von Söhsten; Junior, Esio de Carvalho Coelho; Alves, Klécio de Andrade; Ximenes, Rosana Christine Cavalcanti; Barreira, Alice Kelly; Couto, Geraldo Bosco Lindoso

    2016-01-01

    O transtorno obsessivo compulsivo (TOC) é um transtorno psiquiátrico crônico que atinge de 1 a 2% da população de crianças e adolescentes, necessitando de uma abordagem adequada durante o atendimentoodontológico devido ao aumento da ansiedade, às medicações utilizadas no tratamento do transtorno e, possivelmente, devido a comportamentos compulsivos. O objetivo deste trabalho foi fazer um levantamentobibliográfico a respeito das principais características do TOC na infância e adolescência e tr...

  16. Sistema de plataformas de força e identificação de movimentos por processamento de imagem para aplicação em treinamento do equilíbrio baseado em biofeedback

    OpenAIRE

    Lavarda, Marcos Dinís

    2016-01-01

    Parte da população mundial sofre com distúrbios relacionados ao controle muscular de membros superiores e inferiores que, em muitos casos, podem ter sua origem devido a interrupção da comunicação sensório-motora entre o cérebro e os grupos musculares. Estes fatores podem estar relacionados à idade, doenças neuro-degenerativas ou acidentes vasculares cerebrais (AVC). Dessa forma, devido ao gradativo envelhecimento da população, em função do aumento da expectativa de vida e consequentemente da ...

  17. Ondas de spin em redes decoradas

    OpenAIRE

    WanÃssa FaÃanha da Silva

    2014-01-01

    Sistema de baixa dimensionalidade tÃm atraÃdo uma grande atenÃÃo ultimamente devido a sistemas como grafeno e nanotubos de carbono. Tais sistemas tÃm grandes possibilidades de aplicaÃÃes tecnolÃgicas, em particular na criaÃÃo de dispositivos eletrÃnicos, devido Ãs suas propriedades eletrÃnicas especÃficas. Nesse sentido, o estudos de outros sistemas em baixa dimensÃo se torna urgente. Mais especificamente, o estudo de propriedades magnÃticas de materiais de materiais em baixa dimensionalidade...

  18. Tecnologia da destilação molecular : da modelagem matematica a obtenção de dados experimentais aplicada a produtos de quimica fina

    OpenAIRE

    Cesar Benedito Batistella

    1999-01-01

    Resumo: A industrialização de compostos de química fina requer muito esforço em sua manufatura, especialmente no estágio de purificação, devido às especificações rigorosas desta classe de produtos. A destilação convencional, entretanto, em muitos casos, não pode ser utilizada, devido à instabilidade térmica dos compostos envolvidos. Existem, por exemplo, produtos sensíveis ao calor, tais como, vitaminas A, E, K, muitos intermediários farmacêuticos, como a ranitidina, diversos cosméticos, óleo...

  19. Identificação de espécies do gênero Aspergillus, seções Nigri, Flavi e Circumdati por taxonomia polifásica

    OpenAIRE

    Couto, Fabiana Aparecida

    2013-01-01

    Os fungos filamentosos estão entre os grupos de microrganismos que mais se destacam, devido à sua ampla utilização nos processos biotecnológicos e ambientais. Devido à grande importância destes microrganismos para o ambiente e para a humanidade, torna-se fundamental o estudo até espécies de fungos filamentosos. Este estudo foi realizado com o objetivo de utilizar diferentes metodologias para caracterizar e identificar isolados de Aspergillus Seção Flavi, Seção Nigri e Seção Circumdati, de dif...

  20. ANÁLISE DE SUPERFÍCIE DE RESPOSTA DOS BLENDS DO ÓLEO DE MAMONA E BABAÇU

    OpenAIRE

    Francisco Francielle Pinheiro dos Santos; Francisca Diva Lima Almeida; Francisco de Assis da Silva Mota; Maria Alexsandra de Sousa Rios; Auceliane André da Silva Lima

    2014-01-01

    A mamona, (Ricinus communis L.), é uma planta oleaginosa que tem recebido grande destaque no programa brasileiro de biodiesel. O Programa fez a opção pelo plantio da mamona devido as suas características de cultivo, adaptação a múltiplos tipos de solo e características da gestão familiar. No entanto, devido a sua elevada viscosidade, o óleo de mamona tem sido cada vez mais descartado do cenário brasileiro da produção de biodiesel, sendo assim, torna-se necessário a mistura (blends) deste óleo...

  1. Estudo experimental de um supressor de vibração PTMD em um modelo reduzido de jumper submerso

    OpenAIRE

    Luan Grégori Tochetto

    2013-01-01

    Resumo: Tubulações submarinas, tais como risers e jumpers, sofrem carregamentos estáticos e dinâmicos devido a forças ambientais, correntes marítimas e ondas, carregamentos devido aos deslocamentos da unidade flutuante de produção (plataformas ou navios), escoamento interno, além de outras causas. O controle dos deslocamentos oscilatórios dessas tubulações é fundamental para a confiabilidade e vida em fadiga desses sistemas, motivando projetos de pesquisa com tal propósito nos últimos anos. U...

  2. Phylogeny and phylogeography of atlantic islands' Columba species

    OpenAIRE

    Dourado, Ana Catarina Gonçalves

    2011-01-01

    Tese de mestrado. Biologia (Biologia Humana e Ambiente). Universidade de Lisboa, Faculdade de Ciências, 2011 Os arquipélagos têm sido essenciais para a aquisição de conhecimento acerca de processos evolutivos (Bollmer et al. 2006; Dietzen et al. 2008), pois o fluxo genético é reduzido devido à existência de barreiras geográficas, a sua fauna e flora é bem conhecida devido ao reduzido tamanho das ilhas e também porque podem possuir habitats diversos. Estes factores contribuem para que os ar...

  3. Recasamento: percepções e vivências dos filhos do primeiro casamento

    OpenAIRE

    Valentim de Sousa, Daniela Heitzmann Amaral; Dias, Cristina Maria de Souza Brito

    2014-01-01

    Esta pesquisa teve como objetivo compreender as percepções e as vivências de filhos diante das mudanças ocorridas em suas vidas, no âmbito da convivência familiar, devido ao recasamento de um ou de ambos os pais. É uma pesquisa qualitativa cujos participantes são quatro adultos jovens. Eles responderam a uma entrevista analisada de acordo com a Análise de Conteúdo Temática. Pode-se concluir que, apesar das dificuldades iniciais devido às alterações na estrutura física, na rotina e na dinâmica...

  4. Loss of soil determination in Fazenda Canchim - SP (EMBRAPA) using geographic information systems and USLE 2D

    OpenAIRE

    SILVA, Fernando das Graças Braga da; MINOTTI, Ricardo Tezini; LOMBARDI NETO, Francisco; PRIMAVESI, Odo; CRESTANA, Silvio

    2010-01-01

    Os modelos hidrossedimentológicos têm enorme potencial no Brasil para ser a melhor ferramenta de estimativa de perda de solo, devido principalmente a sua complexidade na descrição dos processos e sua robustez que os fundamenta. Entretanto, devido à necessidade de uma quantidade muito grande de informações requerida, aliada a dificuldades de adaptações desses modelos internacionais e necessidade de tempo e estrutura para criação de modelos nacionais, a Equação Universal de Perda de Solo (EUPS)...

  5. Funcionalização de nanocelulose de celulose bacteriana com colágeno hidrolisado

    OpenAIRE

    Gina Alejandra Gil Giraldo

    2016-01-01

    A nanocelulose vêm se destacando devido a suas propriedades físico-químicas únicas, elevada pureza, alto índice de cristalinidade, biodegradabilidade e benefícios ambientais causados pelo seu uso, hoje é profundamente estudada com intuito de desvendar suas potencialidades. Processos como funcionalização de superficies utilizando polimeros têm despertado grande atenção, devido a sua vasta gama de aplicações tecnológicas, além disso, sua versatilidade pode ser muito incrementada pela otimização...

  6. Afasia global sem hemiparesia: relato de caso

    OpenAIRE

    SILVA,MARCUS TULIUS TEIXEIRA DA; CAVALCANTI,JOSÉ LUÍS DE SÁ; MOREIRA,DENISE MADEIRA

    2000-01-01

    Afasia global geralmente é acompanhada por hemiparesia direita devido à extensão da lesão subjacente. Recentemente têm sido registrados na literatura casos em que tal síndrome ou não se acompanha do déficit motor ou este é apenas transitório, sendo esta condição conhecida como afasia global sem hemiparesia (AGSH). Relatamos caso de AGSH devido a infarto cerebral embólico cardiogênico, corroborando a tese de que esta condição pode ter valor preditivo para o diagnóstico de infartos embólicos....

  7. Efeito da ingestão de chocolate e erva mate no perfil lipídico e oxidativo de indivíduos com HIV/AIDS em uso de terapia antirretroviral

    OpenAIRE

    Suelen Jorge de Souza

    2013-01-01

    Introdução: Atualmente observa-se aumento das complicações cardiovasculares, como alterações no perfil lipídico e oxidativo, em indivíduos com HIV/AIDS, devido à própria infecção, bem como aos diferentes componentes da terapia antirretroviral (TARV). Vários estudos, em outras populações, mostram que os flavonóides presentes no cacau (Theobroma cacao) e erva mate (Ilex paraguariensis) podem melhorar a função cardiovascular devido às suas propriedades antioxidantes e hipolipemiantes. Objetivo: ...

  8. O consumo da magreza : a publicidade como ideal de felicidade

    OpenAIRE

    Silveira, Beatriz de Oliveira

    2013-01-01

    A temática da felicidade tornou-se objeto de estudo de muitos pesquisadores, devido à preocupação acerca das atitudes que estamos tomando na busca por experimentá-la. Devido ao uso recorrente da imagem de homens sarados e mulheres gostosas por meio da publicidade, a magreza tornou-se não apenas uma obsessão na contemporaneidade, mas também vem sendo apontada como requisito para que se possa ser feliz. Não é comum observar atrizes ...

  9. Empleo racional de la coronectomía en la extracción de terceros molares incluidos Rational application of coronectomy when treating lower impacted third molar

    Directory of Open Access Journals (Sweden)

    C. Recio Lora

    2009-08-01

    Full Text Available Los terceros molares son los dientes que, con más frecuencia, sufren el fracaso de su erupción y quedan incluidos o retenidos dentro de los maxilares. Un gran porcentaje de nuestros pacientes presentan los cordales incluidos y, de ellos, una parte importante se acompaña de patología que hace aconsejable su tratamiento quirúrgico. La técnica de la coronectomía aplicada al tercer molar incluido fue descrita por primera vez por Ecuyer y Debien en 1984 como la eliminación parcial de dicho diente, dejando deliberadamente parte de su raíz en el interior de la mandíbula. Fue propuesta para evitar la lesión del nervio dentario inferior (NDI en aquéllos casos en los que existía una íntima relación entre ambas estructuras anatómicas. Aunque el objetivo de la técnica es muy claro, no está libre de controversia, ya que el cirujano debe valorar la posibilidad de una complicación infecciosa de origen pulpar. Presentamos un caso clínico exitoso de esta técnica, junto al análisis de la postura ante la técnica de los distintos autores, así como sus ventajas e inconvenientes.Third molars are the teeth that most frequently fail to erupt and remain impacted or retained inside the bone. A large percentage of our patients have impacted wisdom teeth and many of these patients also have pathologies that require surgical treatment. Applied coronectomy technique of the impacted third molar was first described by Ecuyer and Debien in 1984. The described it as partial elimination of the tooth in question, deliberately leaving part of the root inside the bone. This was proposed to avoid injuring the inferior dental nerve in cases where there was a close relationship between the two anatomical structures. Although the objective of the procedure is very clear, it is still controversial. Therefore, the surgeon should evaluate the possibility of an infectious complication of pulpar origin. We present the successful clinical case that uses this technique

  10. Avaliação do tratamento endodôntico em radiografias periapicais e panorâmicas Evaluation of endodontic treatment with periapical and panoramic radiography

    Directory of Open Access Journals (Sweden)

    Cristina Maria Dumit SEWELL

    1999-07-01

    Full Text Available Radiografias periapicais e panorâmicas, com aparelho elipsopantomográfico, são comparadas na avaliação do tratamento endodôntico. Com este objetivo, radiografias realizadas nestas duas técnicas, num mesmo paciente, com pelo menos um dente com tratamento endodôntico, foram analisadas por três examinadores, levando-se em consideração as condições apicais (lesões periapicais, a obturação do canal radicular (tipo de material, preenchimento e limite apical, a restauração do dente e o preenchimento da câmara pulpar. Os resultados mostram que a radiografia periapical define melhor a presença de rarefação óssea periapical difusa, obturação do canal radicular com guta-percha, tratamento endodôntico inadequado, justaposição do material restaurador inadequada para a região anterior e a presença de restauração metálica fundida na região posterior. Para os demais itens avaliados, os resultados da análise estatística não são significantes. A concordância de diagnósticos entre examinadores se mostra superior nas radiografias periapicais.Periapical and panoramic radiography with a ellipsopantomograph device, are compared in the evaluation of endodontic treatment. With this objective, radiographies carried out under both techniques with the same patient having at least one tooth endodontically treated, were analysed by three observers, taking into consideration the apical conditions (periapical lesions, the root canal filling (material type, filling and apical level, tooth restoration and filling of the pulpar camera. The results demonstrated that periapical radiography is a better way to define the appearance of difuse periapical bone rarefaction, root canal filling with gutta-percha, insatisfactory endodontic treatment, an inadequate juxtaposition of the restoration material to the anterior region, and the presence of metallic casted restorations in the posterior region. Other result evaluations were not significant. The

  11. Tratamiento Endodóntico no Instrumentado en dientes deciduos

    Directory of Open Access Journals (Sweden)

    Perona-G

    2014-01-01

    Full Text Available Teniendo en cuenta la complejidad del tratamiento pulpar en una pieza decidua y diversos factores que determinan el éxito clínico como son la anatomía de una pieza decidua, el proceso de reabsorción ya sea de origen fisiológico o por una infección odontogénica, la conducta del paciente, la técnica empleada y la pericia del operador; es de suma importancia que en la práctica odontopediátrica se tenga en cuenta ciertos procedimientos que aseguren la presencia del diente en boca hasta su exfoliación fisiológica, es de esta manera que la Técnica de Endodoncia no Instrumentadas en dientes deciduos es un tema muy importante a tener presente en cuanto a terapia pulpar se refiere. Las pulpectomías no instrumentadas (NIET; termino mal empleado para este procedimiento, ya que la técnica no consiste en realizar una pulpectomía propiamente dicha; en su lugar emplean diversas pastas que tienen por objetivo la desinfección de los conductos radiculares mediante el empleo de sustancias bacteriostáticas y bactericidas y de esta manera permitirán la reparación del los tejidos dañados. El propósito de este artículo fue hacer una revisión de la literatura de todo lo concerniente a Terapia Endodóntica no Instrumentada en dentición decidua. En conclusión se puede decir que dadas las características de la dentición temporal, la cual impide una completa manipulación de los conductos radiculares, el éxito de la pulpectomía depende de la reducción o eliminación de las bacterias no solo dentro del conducto sino también en lugares donde la preparación química y mecánica sea difícil de acceder, en la técnica NIET se utiliza una mezcla de antibióticos para esterilizar el conducto radicular en vez de usar la técnica de instrumentación, las pastas obturadoras asumen un papel fundamental para que la reparación de los elementos dentarios se desenvuelva de acuerdo a los patrones biológicos normales.

  12. Nuevo enfoque de la interpretación del dolor en una pulpitis aguda

    Directory of Open Access Journals (Sweden)

    Andrés O Pérez Ruiz

    2000-04-01

    Full Text Available El dolor es probablemente el principal motivo de consulta en las urgencias estomatológicas y es precisamente el dolor de la pulpitis aguda el que comentamos en este trabajo. El dolor pulpar en sí mismo es similar al dolor que resulta por inflamación de los órganos viscerales y, por lo tanto, podrían ser inadecuados los intentos de explicarlos por comparación con los nociceptores de estructuras somáticas. Se propone analizar el comportamiento del dolor como consecuencia de una pulpitis aguda, con un nuevo enfoque, asimilándolo como el dolor proveniente de estructuras viscerales con manifestaciones dolorosas alejadas del sitio o zona dañada y en el propio diente en que el tejido ha sido injuriado y evoluciona rápidamente hacia la necrosis. Establecemos una analogía entre el dolor visceral como el generado de la pulpa y el del tipo somático profundo como el correspondiente a la afectación periapical por rápida evolución de la inflamación hacia la necrosis.Pain is probably the chief complaint in dental emergencies and this paper deals precisely with the pain caused by acute pulpitis. The pulpar pain itself is similar to the one resulting from inflammation of the visceral organs and, therefore, the attempts to explain these pains by comparing them with the nociceptors of somatic structures may be inappropiate. It is our objective to analyze the behaviour of pain caused by acute pulpitis with a new approach, assimilating it as the pain from visceral structures with painful manifestations far from the damaged site or zone and it is the own tooth whose tissue has been affected and evolves rapidly to necrosis.We establish an analogy between the visceral pain as the one generated by the pulpa and that of deep somatic type as the corresponding to the periapical affection by the fast evolution of inflammation to necrosis.

  13. Importance of bacterial endotoxin (LPS in endodontics A importância da endotoxina bacteriana (LPS na endodontia atual

    Directory of Open Access Journals (Sweden)

    Mario Roberto Leonardo

    2004-06-01

    Full Text Available New knowledge of the structure and biological activity of endotoxins (LPS has revolutionized concepts concerning their mechanisms of action and forms of inactivation. Since the 1980's, technological advances in microbiological culture and identification have shown that anaerobic microorganisms, especially Gram-negative, predominate in root canals of teeth with pulp necrosis and radiographically visible chronic periapical lesions. Gram-negative bacteria not only have different factors of virulence and generate sub-products that are toxic to apical and periapical tissues, as also contain endotoxin (LPS on their cell wall. This is especially important because endotoxin is released during multiplication or bacterial death, causing a series of biological effects that lead to an inflammatory reaction and resorption of mineralized tissues. Thus, due to the role of endotoxin in the pathogenesis of periapical lesions, we reviewed the literature concerning the biological activity of endotoxin and the relevance of its inactivation during treatment of teeth with pulp necrosis and chronic periapical lesion.O conhecimento mais aprofundado sobre a estrutura e atividade biológica das endotoxinas (LPS revolucionou os conceitos sobre seu mecanismo de ação e formas de inativação. A partir da década de 80, os avanços tecnológicos na cultura e identificação microbiológica demonstraram que, em canais radiculares de dentes portadores de necrose pulpar e lesão periapical crônica, visível radiograficamente, predominam microrganismos anaeróbios, particularmente os gram-negativos. Como se sabe, os microrganismos gram-negativos, além de possuírem diferentes fatores de virulência e gerarem produtos e sub-produtos tóxicos aos tecidos apicais e periapicais, contêm endotoxina em sua parede celular. Esse conhecimento é particularmente importante, uma vez que a endotoxina é liberada durante a multiplicação ou morte bacteriana, exercendo uma série de

  14. Uso indiscriminado de tetraciclinas en afecciones bucales de origen odontógenas Overuse of tetracycline in oral diseases of odontogenous origin

    Directory of Open Access Journals (Sweden)

    Hilda Rodríguez Chala

    2007-03-01

    Full Text Available El uso de los antibióticos en la terapéutica de las enfermedades infecciosas constituyó un avance en la historia de la humanidad. Sin embargo, en la actualidad existe un uso indiscriminado de estos, que trae consigo la resistencia bacteriana y por ende, la no efectividad del mismo. Se realizó un estudio en 40 pacientes que ingerían la tetraciclina debido a afecciones bucales de origen odontógeno, con el objetivo de conocer cuáles eran las enfermedades bucales donde esta se utilizaba indiscriminadamente, así como los mecanismos (automedicación o prescripción. Se obtuvieron comos resultados que las odontalgias por alteraciones pulpares y los abscesos dentoalveolares agudos son las patologías bucales donde se usa irracionalmente la tetraciclina, tanto en el fenómeno de automedicación como en la prescripción por parte de facultativos. La automedicación fue la vía dónde se evidenció mayor uso de la tetraciclina con el 67,5 %, y se observaron varios factores que condicionan este comportamiento. Existió un elevado porcentaje de no efectividad de este ante afecciones bucales debido al uso indiscriminado, ya sea por no ser el antibiótico de elección ante la patología o por ser ingerido innecesariamente.The use of antibiotics in treating infectious diseases was a breakthrough in the history of mankind. However, there is at present an excessive use of these drugs that leads to antimicrobial resistance and ineffectiveness. Forty patients, who took tetracycline for oral diseases of odontogenous origin, were studied to find out the oral diseases where this drug was overused as well as the intake mechanisms (self-medication or prescription. The achieved results showed that odontalgias from pulpar disturbances and acute dentoalveolary abscesses are the oral pathologies where tetracycline is irrationally overused through self-medication and prescription by physicians. Self-medication was the most frequent way of administering tetracycline

  15. Pulpite crônica hiperplásica: análise histológica ao microscópio de luz e microscópio eletrônico de transmissão = Chronic hyperplastic pulpitis: histological analysis in light microscope and transmission electron microscope

    Directory of Open Access Journals (Sweden)

    Moura, Camilla Christian Gomes

    2006-01-01

    Full Text Available Este estudo analisou as características morfológicas de pólipos pulpares de adultos jovens ao microscópio de luz (ML e ao microscópio eletrônico de transmissão (MET. Foram analisados 5 pólipos de primeiros molares, que foram removidos e fixados em glutaraldeído 2,5%. Após a fixação, cada pólipo foi dividido em duas metades, uma foi processada para inclusão em glicol metacrilato e a outra para inclusão em resina epóxica. Os cortes histológicos com 3 µm de espessura foram corados em azul de toluidina e analisados ao ML e os cortes com 80 nm foram contrastados em citrato de chumbo e acetato de uranila e analisados ao MET. Ao ML foi observado epitélio espesso não queratinizado com alguns mastócitos na camada basal. O conjuntivo apresentou infiltrado inflamatório crônico, com ninhos de plasmócitos e vasos neoformados. A análise ao MET mostrou células epiteliais da camada basal com núcleo ovóide, citoplasma com muitos ribossomas livres, mitocôndrias e poucos feixes de tonofilamentos. A lâmina basal apresentou-se nítida com muitos hemidesmossomas. Na camada espinhosa observou-se células grandes, núcleos com cromatina descondensada e nucléolos evidentes. No citoplasma foi observado muitos feixes de tonofilamentos, muitas mitocôndrias, ribossomas livres e muitos desmossomas. No conjuntivo observou-se macrófagos, mastócitos e plasmócitos na região adjacente ao epitélio. Nas regiões mais profundas predominavam fibroblastos entres feixes de fibrilas colágenas, vasos sangüíneos com células endoteliais proeminentes e pericitos associados. Os resultados confirmaram que o epitélio do pólipo pulpar apresenta características morfológicas semelhantes ao da mucosa oral humana. O conjuntivo mostrou características de inflamação crônica de intensidade variada

  16. A new class of strongly coupled plasmas inspired by sonoluminescence

    Science.gov (United States)

    Bataller, Alexander; Plateau, Guillaume; Kappus, Brian; Putterman, Seth

    2014-10-01

    Sonoluminescence originates in a strongly coupled plasma with a near liquid density and a temperature of ~10,000 K. This plasma is in LTE and therefore, it should be a general thermodynamic state. To test the universality of sonoluminescence, similar plasma conditions were generated using femtosecond laser breakdown in high pressure gases. Calibrated streak spectroscopy reveals both transport and thermodynamic properties of a strongly coupled plasma. A blackbody spectrum, which persists long after the exciting laser has turned off, indicates the presence of a highly ionized LTE microplasma. In parallel with sonoluminescence, this thermodynamic state is achieved via a considerable reduction in the ionization potential. We gratefully acknowledge support from DARPA MTO for research on microplasmas. We thank Brian Naranjo, Keith Weninger, Carlos Camara, Gary Williams, and John Koulakis for valuable discussions.

  17. Total skeletal uptake of diphosphonate in Paget's bone disease and rheumatoid arthritis

    International Nuclear Information System (INIS)

    Cabrejas, M.J.; Mautclen, C.A.; Fromm, G.

    1982-01-01

    Sup(99m) Technetium-diphosphonates (99m-Tc-DP) are very satifactory agents to quantify total skeletal uptake (TSU) in normal and pathological conditions. Although the intimate mechanism of skeletal localization of 99m-Tc-DP is not completely understood the test appears to be a very sensitive index of increased bone turnover. TSU can be determined by several methods: urine collection, whole body counter retention and gamma camara body retention studies. The urine collection method seems to be an easy and reliable method, having the advantage that no expensive device is needed. Further studies on the skeletal uptake of 99m-Tc-DP, in normal subjects and pathological conditions, with special emphasis on patients with rheumatoid arthritis, are reported. Correlation of these data with other tests indicating bone turnover, such as cortical bone loss determined by densitometry or urinary hydroxyproline excretion, supports previous reports that the TSU is a useful parameter to evaluate bone metabolism

  18. [Morphological abnormalities in the cibarium of Lutzomyia evansi (Diptera: Psychodidae, Phlebotominae) caught in Trujillo, Venezuela].

    Science.gov (United States)

    Méndez-de Daboín, Yolanda; Oviedo-Araújo, Milagros; González-Pérez, Adalberto; Suárez-Hernández, Jorge; Sandoval, Claudia M; Cazorla, Dalmiro

    2015-01-01

    Lutzomyia evansi is a recognized vector of Leishmania infantum in Colombia and Venezuela. To describe and illustrate the morphological abnormalities in Lu. evansi females captured in a rural focus of visceral leishmaniasis in Trujillo, Venezuela. Phlebotomine sand flies were collected using CDC light traps, Shannon traps and aspiration in resting places. The identification was performed according to Young & Duncan (1994) and drawings were made using a microscope with camara lucida . Abnormalities in the cibarium of Lu. evansi were detected in 4 (0.12%) females of the 3,477 adults that were studied. Lutzomyia evansi can have uncommon morphological variants associated with an increase in the number of teeth in the cibarium and their arrangement, which may lead to errors in the taxonomic identification of anomalous specimens. The study of such deformities can serve to avoid taxonomic identification errors.

  19. Vermicomposting and anaerobic digestion – viable alternative options for terrestrial weed management – A review

    Directory of Open Access Journals (Sweden)

    Biswanath Saha

    2018-03-01

    Full Text Available The management of terrestrial weed is of great concern for the scientific community as these weeds cause adverse effect in different ecosystems like forest, agriculture and urban. The widespread of these weeds by their adaptive capability and morphological advancement is difficult to control. Parthenium hysterophorous, Lantana camara, Saccharum spontaneum, Ageratum conyzoides are the weeds that spread all over the world. There are various management practices employed for the control of this weeds. But all of these practices have some drawbacks those are neither environment friendly nor economical. In this paper a review has been done to evaluate various alternative management practices for these terrestrial weeds and to analyze their feasibility. Vermicomposting and anaerobic digestion can be viable alternative option which is cost effective as well. There are few studies regarding vermicomposting and anaerobic digestions of terrestrial weeds are done.

  20. A triboelectric closed loop band system for the generation of x-rays

    Science.gov (United States)

    Van Cleve, E.; Lucas, B.; Ganlieli, Z.; Wong, E. W.; Cortes, P.; Mehta, N.; Cuadra, D.; Fong, J.; Hansen, S.; Kotowski, A.; Camara, C. G.

    2015-08-01

    X-ray have been commercially produced using the same basic design since their discovery by Wilhelm Roentgen in 1895, for which he was awarded the first Nobel prize in physics. This technology requires high voltage elements, ultra high vacuum tubes, and high voltage electronics. The vacuum and high voltage drive up the price of x-ray technology and in order to bring down the cost, a brand new way to produce x-rays is needed. In 2008 Carlos Camara, Juan Escobar, Jonathan R. Hird, and Seth Putterman1 discovered that by pealing scotch tape in a vacuum you could create enough x-rays to take an x-ray radiograph of a finger. This lead to the formation of Tribogenics and the development of the rod and band x-ray architecture.

  1. Invasion establishment and habitat suitability of Chromolaena odorata (L. King and Robinson over time and space in the western Himalayan forests of India

    Directory of Open Access Journals (Sweden)

    Gautam Mandal

    2014-12-01

    Full Text Available Habitat suitability assessment of the invasive species Chromolaena odorata (L. King and Robinson from Himalayan forests reveals some interesting findings and conclusions. At different study sites, 29 of 72 species were exotic and invasive and comprised 21 genera and eight families. Indigenous species accounted for 59% of the total species and comprised 26 genera and 11 families. Perennials outnumbered the annuals in all study sites. Chromolaena odorata and Lantana camara L. were the only invasive species that were common to all sites with high importance value index values. The present work reveals that sites with high biotic pressure, maximum temperature variation, open forest canopy, and free from herbivory are the most suitable habitat for the growth of C. odorata. An elevated level of phosphorus, potassium, magnesium, soil organic matter, and nitrogen and acidic soil in all invaded sites are possible reasons for further invasion of C. odorata.

  2. La cultura política democrática de la clase parlamentaria uruguaya

    Directory of Open Access Journals (Sweden)

    ISMAEL CRESPO

    1998-01-01

    Full Text Available este articulo analiza las opiniones, actitudes y valores de la clase parlamentaria uruguaya en relacion a su grado de cultura politica democratica, de acuerdo con distintas dimensiones. mediante la informacion obtenida de una encuesta aplicada durante la segunda mitad de 1996 a una muestra representativa de la camara de representantes, este trabajo reafirma la continuidad de la mayor parte de los rasgos que han caracterizado la conformacion del sistema politico uruguayo. asi, se constata un alto grado de coincidencia entre los parlamentarios -tanto en sus juicios de valor como en sus percepciones sobre el funcionamiento del sistema politico-, con independencia de su adscripcion partidista, origen territorial o edad. a partir de esta constatacion se diseña un panorama de las opiniones politicas de la clase parlamentaria sobre estos temas de forma global.

  3. EFFECTIVENESS OF GLYPHOSATE AND 2.4 D AMIN HERBICIDES TO CONTROL WEEDS UNDER Shorea selanica Bl. PLANTATION IN CARITA TRIAL GARDEN, BANTEN

    Directory of Open Access Journals (Sweden)

    Ari Wibowo

    2007-03-01

    Full Text Available A trial was carried out in Carita, West Java, to identify the effectiveness of Glyphosate and 2.4 D Amin Herbicide to control weeds under Shorea selanica Bl. plantation. The trial was conducted through the application of Glyphosate and 2.4 D Amin Herbicide with dosages of 5, 6, 7, 8 and 9 liter per ha and compared with Glyphosate herbicide 5 liter per ha, manual treatment, and control (no treatment. The result showed that Glyphosate and 2.4 D Amin Herbicide could be used to control weeds in order to maintaining S. selanica Bl. plantation. Minimum dosage of 6 liter/ha was effective to control weeds such as Chromolaena odorata DC, Mikania micrantha Will, Lantana camara L, Imperata cylindrica Beauv., Melastoma malabathricum L, and Boreria latifolia Bl. Furthermore, there was no symptom of poison on S. selanica Bl. plantation after herbicide application with all dosages applied.

  4. EKSPLORASI DAN PRODUKTIFITAS PADANG PENGGEMBALAAN DI KECAMATAN PAMONA TIMUR KABUPATEN POSO SULAWESI TENGAH

    Directory of Open Access Journals (Sweden)

    P.D.M.H. Karti

    2015-06-01

    Full Text Available Pasture in District of East Pamona, Poso Regency has potential as forage for livestock.. This study was conducted in two villages (Didiri and Kelei to explore of plant species as feed and productivity calculation such as botanical composition and carrying capacities. Type of grasses that grow are Sporobolus sp, Paspalum sp, Paspalum cartilagineum, Axonopus compresus, Euleusine indica. Type of legumes that grow are Stylosanthes guianensis, Desmodium sp, Centrocema pubescens, Callyandra callothyrsus, Leucaena leucocephala. Types of weeds have started to grow in several locations within the region, such as Melastoma, Mimosa pudica, Imperata cylindrica, Cromolena odorata, Cyperacea, and Lamtana camara. Botanical composition (% in Kelei for grass, legumes, weeds (84.76: 6.75: 8:49 and Didiri for grass, legumes, weeds (95.34: 0:51: 4.15. Carrying Capacities in Kelei and Didiri was 0.96 ± 0:23 and 1:12 ± 0:29 ST / ha.

  5. Longitudinal evaluation of Ocimum and other plants effects on the feeding behavioral response of mosquitoes (Diptera: Culicidae in the field in Tanzania

    Directory of Open Access Journals (Sweden)

    Tenu Filemoni

    2008-10-01

    Full Text Available Abstract Background The use of repellent materials from plants against nuisance insects is common with great potential to compliment existing malaria control programmes and this requires evaluation in the field. Ocimum plant species, Ocimum suave (Willd and O. kilimandscharicum (Guerke materials and their essential oils extracted by steam distillation were evaluated in the field and experimental huts for repellence, exophily and feeding inhibition effects against three mosquito species, Anopheles arabiensis (Patton, An. gambiae ss (Giles and Culex quinquefasciatus (Say. The protective effect of essential oils from Ocimum plants were compared with N, N-diethly-3- methylbenzamide (DEET, a standard synthetic repellent. Also, the protective effect of fumigation by burning of repellent plants; Ocimum suave, Ocimum kilimandscharicum, Azadirachta indica, Eucalyptus globules and Lantana camara were tested in experimental huts and selected local houses. Results In the field, protection by Ocimum plants from mosquito bites was high and there was small variation among different mosquito species. Protection efficiency was 93.4%, 91.98% and 89.75% for An. arabiensis while for Cx. quinquefaciatus it was 91.30%, 88.65% and 90.50% for DEET, Ocimum suave and O. kilimandscharicum respectively. In the experimental hut, deterrence induced by burning of Ocimum and other plants ranged from 73.1.0% to 81.9% for An. arabiensis and 56.5% to 67.8% for Cx. quinquefaciatus, while feeding inhibition was 61.1% to 100% for An. arabiensis and 50% to 100% for Cx. quinquefaciatus. Evaluations under field conditions confirmed high protective efficacy, enhanced feeding inhibition and house entry inhibition (Deterrence. Conclusion This study shows the potential of Ocimum suave and Ocimum kilimandscharicum crude extracts and whole plants of Ocimum suave, Ocimum kilimandscharicum, Azadirachta indica, Eucalyptus globules and Lantana camara for use in protecting against human biting

  6. Saving 50% of energy in air conditioning and refrigeration; 50% de ahorro de energia en aire acondicionado y refrigeracion

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez De la Fuente, Rodolfo Javier [Instituto para la Proteccion Ambiental de Nuevo Leon-CAINTRA, Nuevo Leon (Mexico); Bolado Tamez, Jaime Antonio [Industrias AlEn S. A. de C. V., Monterrey (Mexico)

    1998-12-31

    Due to the fact that the air conditioning systems represent up to 70% of the energy consumption in our buildings, to the constant raise of the electric tariffs and to the increment of temperatures in Nuevo Leon State, as well as the restrictions on the use of some refrigerant fluids because of its potential damage to the ozone layer (Montreal Protocol) and the preferential use of refrigerants with low global heating potential (Kioto Protocol). The Camara de la Industria de la Transformacion de Nuevo Leon (Nuevo Leon`s Transformation Industry Chamber) through the Instituto para la Proteccion Ambiental de Nuevo Leon (Nuevo Leon`s Institute for Environmental Protection), create the program ECO-REFRIGERATION whose three missions are: Increase the efficiency of air conditioning and refrigeration equipment, promote the substitution of refrigerants and extend the benefits of these projects to the community in general. [Espanol] Debido a que los sistemas de climatizacion representan hasta el 70% de consumo energetico en nuestros inmuebles, al constante incremento de las tarifas electricas, el incremento de las temperaturas en Nuevo Leon, asi como la restriccion del uso de algunos refrigerantes por su potencial de dano de la capa de ozono (Protocolo de Montreal) y el uso preferente de refrigerantes con bajo potencial de calentamiento global (Protocolo de Kioto), la Camara de la Industria de la Transformacion de Nuevo Leon a traves del Instituto para la Proteccion Ambiental de Nuevo Leon crean el Programa ECO-REFRIGERACION cuyas tres misiones son: Incrementar la eficiencia de los equipos de aire acondicionado y refrigeracion, promover la sustitucion de refrigerantes y extender los beneficios de este proyecto a la comunidad en general.

  7. Integral energy policy; Politica energetica integral

    Energy Technology Data Exchange (ETDEWEB)

    Bazan Navarrete, Gerardo [Programa Universitario de Energia, Universidad Nacional Autonoma de Mexico, Mexico, D.F. (Mexico)

    2006-11-15

    The guidelines of energy policy are normative directions that govern the energy sector and its relations with different objects, these guidelines must be in agreement with the national objectives so that they collaborate to its accomplishment. Camara Nacional de la Industria y Trasnformacion (CANACINTRA) and the University Program of Energy made a diagnosis and long term prospective of the Energy Sector. With the design of five possible growth scenarios to year 2030 the total demand of energy required for the 2030 was calculated with the purpose of determining the mixture of the primary energy sources to satisfy the projected demand. With such data a decalogue of recommendations was formulated that appeal for better policies of organization and action, promotions and forecasts to obtain an optimal national performance, competitive at international level. [Spanish] Los lineamientos de politica energetica son orientaciones normativas que rigen el sector energetico y sus relaciones con distintos objetos, estos lineamientos deben estar a tono con los objetivos nacionales de modo que colaboren a su realizacion. Camara Nacional de la Industria de Transformacion (CANACINTRA) y el Programa Universitario de Energia realizaron un diagnostico y prospectiva a largo plazo del sector energia. Con el diseno de cinco posibles escenarios de crecimiento al 2030 se calculo la demanda total de energia requerida para el 2030 con el fin de determinar la mezcla de energeticos primarios para satisfacer la demanda proyectada. Con tales datos se conformo un decalogo de recomendaciones que apelan a mejores politicas de organizacion y accion, fomentos y previsiones para lograr un optimo desempeno energetico nacional, competitivo a nivel internacional.

  8. Weather types and the regime of wildfires in Portugal

    Science.gov (United States)

    Pereira, M. G.; Trigo, R. M.; Dacamara, C. C.

    2009-04-01

    An objective classification scheme, as developed by Trigo and DaCamara (2000), was applied to classify the daily atmospheric circulation affecting Portugal between 1980 and 2007 into a set of 10 basic weather types (WTs). The classification scheme relies on a set of atmospheric circulation indices, namely southerly flow (SF), westerly flow (WF), total flow (F), southerly shear vorticity (ZS), westerly shear vorticity (ZW) and total vorticity (Z). The weather-typing approach, together with surfacemeteorological variables (e.g. intensity and direction of geostrophic wind, maximum and minimum temperature and precipitation) were then associated to wildfire events as recorded in the official Portuguese fire database consisting of information on each fire occurred in the 18 districts of Continental Portugal within the same period (>450.000 events). The objective of this study is to explore the dependence of wildfire activity on weather and climate and then evaluate the potential of WTs to discriminate among recorded wildfires on what respects to their occurrence and development. Results show that days characterised by surface flow with an eastern component (i.e. NE, E and SE) account for a high percentage of daily burnt area, as opposed to surface westerly flow (NW, W and SW), which represents about a quarter of the total number of days but only accounts for a very low percentage of active fires and of burnt area. Meteorological variables such as minimum and maximum temperatures, that are closely associated to surface wind intensity and direction, also present a good ability to discriminate between the different types of fire events.. Trigo R.M., DaCamara C. (2000) "Circulation Weather Types and their impact on the precipitation regime in Portugal". Int J of Climatology, 20, 1559-1581.

  9. Saving 50% of energy in air conditioning and refrigeration; 50% de ahorro de energia en aire acondicionado y refrigeracion

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez De la Fuente, Rodolfo Javier [Instituto para la Proteccion Ambiental de Nuevo Leon-CAINTRA, Nuevo Leon (Mexico); Bolado Tamez, Jaime Antonio [Industrias AlEn S. A. de C. V., Monterrey (Mexico)

    1999-12-31

    Due to the fact that the air conditioning systems represent up to 70% of the energy consumption in our buildings, to the constant raise of the electric tariffs and to the increment of temperatures in Nuevo Leon State, as well as the restrictions on the use of some refrigerant fluids because of its potential damage to the ozone layer (Montreal Protocol) and the preferential use of refrigerants with low global heating potential (Kioto Protocol). The Camara de la Industria de la Transformacion de Nuevo Leon (Nuevo Leon`s Transformation Industry Chamber) through the Instituto para la Proteccion Ambiental de Nuevo Leon (Nuevo Leon`s Institute for Environmental Protection), create the program ECO-REFRIGERATION whose three missions are: Increase the efficiency of air conditioning and refrigeration equipment, promote the substitution of refrigerants and extend the benefits of these projects to the community in general. [Espanol] Debido a que los sistemas de climatizacion representan hasta el 70% de consumo energetico en nuestros inmuebles, al constante incremento de las tarifas electricas, el incremento de las temperaturas en Nuevo Leon, asi como la restriccion del uso de algunos refrigerantes por su potencial de dano de la capa de ozono (Protocolo de Montreal) y el uso preferente de refrigerantes con bajo potencial de calentamiento global (Protocolo de Kioto), la Camara de la Industria de la Transformacion de Nuevo Leon a traves del Instituto para la Proteccion Ambiental de Nuevo Leon crean el Programa ECO-REFRIGERACION cuyas tres misiones son: Incrementar la eficiencia de los equipos de aire acondicionado y refrigeracion, promover la sustitucion de refrigerantes y extender los beneficios de este proyecto a la comunidad en general.

  10. Gérard Genette. Paratextos Editoriais.DOI: 10.5007/2175-7968.2011v2n28p225

    Directory of Open Access Journals (Sweden)

    Nicoletta Cherobin

    2011-12-01

    Full Text Available Em 1987, Gérard Genette publica Seuils, obra que rapidamente se tornará uma importante referência na área, devido às novidades dos conceitos desenvolvidos a respeito das práticas que acompanham a produção e a recepção de um texto.

  11. Relação entre a Modularidade no Projeto e na Produção em uma Montadora Automotiva no Brasil

    DEFF Research Database (Denmark)

    Kubota, Flávio Issao; Hsuan, Juliana; Cauchick Miguel, Paulo Augusto

    de modularidade, principalmente devido a um entendimento distinto entre as áreas de engenharia do produto e processo acerca da estratégia modular. Sugere-se que a modularidade aplicada no projeto e nos processos, de forma integrada, pode conduzir a benefícios nas fases de projeto, com decisões...

  12. Relato de Caso: Dermatite de Contato Causada por Arruda (Ruta graveolens L.)

    OpenAIRE

    Cortez, Lúcia Elaine Ranieri; Cortez, Diógenes Aparício Garcia

    2008-01-01

    Um homem de 26 anos desenvolveu uma reação fototóxica em suas pernas, após utilizar as partes aéreas frescas da arruda (Ruta graveolens L.), para repelir pernilongos, depois de se expor ao sol. A hipersensibilidade foi causada devido às furanocumarinas (psoralenos) presentes no óleo essencial da arruda.

  13. On persistently positively expansive maps

    Directory of Open Access Journals (Sweden)

    Alexander Arbieto

    2010-06-01

    Full Text Available In this paper, we prove that any C¹-persistently positively expansive map is expanding. This improves a result due to Sakai (Sakai 2004.Neste artigo, mostramos que todo mapa C¹-persistentemente positivamente expansivo e expansor. Isto melhora um resultado devido a Sakai (Sakai 2004.

  14. Morphologic variations of maxillary molars palatal root and the importance of its knowledge for endodontic practice: a case series.

    Science.gov (United States)

    Scarparo, Roberta Kochenborger; Pereira, Leticia; Moro, Diana; Grundling, Grasiela; Gomes, Maximiliano; Grecca, Fabiana Soares

    2011-03-01

    The present report describes and discusses root canal variations in the internal morphology of maxillary molars. Dental internal anatomy is directly related to all the technical stages of the endodontic treatment. Even though, in some situations a typical anatomical characteristics can be faced, and the professional should be able to identify them. This clinical report describes five cases with different pulpar and periapical diagnostics where the endodontic treatment was performed, in which during the treatment the unusual occurrence of two or three canals in the palatal root 'or even two distinct palatal roots' of first and second maxillary molars, were described and important details for achieving treatment success were discussed. The knowledge of tooth internal anatomy must be considered during clinical and radiographic examinations. This should be valued not only to find atypical canals but also to enable calcified canals cleaning and shaping, once they are frequently omitted during endodontic therapy. Anatomic variations can occur in any tooth, and palatal roots of maxillary first and second molars are no exception. The complexity of the root canal system and the importance of identifying its internal anatomy for planning endodontic treatment increase the chances of success.

  15. Bacterial infections of pulp and periodontal origin.

    Science.gov (United States)

    González-Moles, Miguel Angel; González, Nabila M

    2004-01-01

    The anatomical and structural characteristics of the pulp make this structure prone to altering as a result of, for instance, periodontal conditions (proximity), iatrogenic alterations, infections and involvement of vascular and nerve structures (it is surrounded by hard tissues that prevent expansion), to name just a few. Pulpitis is a process that courses with pain of varying intensity that allows us to determine the location of the lesion in clinical terms. Its evolution varies and may even progress to pulpar necrosis that in turn, produces neuritis-like pain. Diagnosis is established by means of clinical symptomatology and supported by X-rays, palpation of tissues at painful sites, application of electrical stimuli, heat, etc. Periodontitis is a bacterial infection originating in the apex. The most important form is the so-called acute apical periodontitis that arises as a result of a prior episode of pulpitis. It is characterized by acute pain located in the tooth, accompanied by the feeling of having a long-tooth. The patient refers being unable to chew on that side; there may be painful mobility of the tooth and an outflow of pus that alleviates symptoms. X-rays do not provide a lot of information, but may attest to a widening of the apical space. This pathology may disseminate to surrounding tissues, leading to conditions of considerable severity.

  16. [Digital blood flow measurement by venous occlusion plethysmography in Raynaud's phenomenon. Value of the rewarming test].

    Science.gov (United States)

    Cristol, R; Debray, J

    1986-01-01

    The fingertip blood flow measured by mercury strain gauge plethysmography with venous occlusion, at 22 degrees C room temperature, had significantly lower mean values in 190 patients with Raynaud's phenomenon (55 men aged 49 yrs +/- 16, 135 women aged 48 yrs +/- 16) than in 40 age and sex matched controls: 18 ml/100 ml/minute +/- 14.6 versus 35 ml/100 ml/minute +/- 15 at level p less than 0.01. The mean fingertip blood flow was significantly lower (p less than 0.01) in 31 cases of scleroderma and 32 cases of pulpar necrosis (respectively 13 ml +/- 13 and 11 ml +/- 8) than in 55 cases of primary Raynaud's disease (no detectable etiology and normal capillaroscopy 5 years after onset) or in 34 cases of mild Raynaud's phenomenon (respectively 21.6 +/- 16 and 24.4 +/- 18). A warming test (both hands in water at 45 degrees C during 3 minutes) was performed in 50 cases with low basal fingertip blood flow. It induced a "normalized" flow in 22 cases (mostly primary or mild Raynaud), a partly improved flow in 20 cases (mostly secondary Raynaud) and no improvement in 8 cases (scleroderma). The warming test appears to be clinically useful to assess the vasospasm and the vasodilating capabilities.

  17. Histological and ultrastructural effect of an Nd:YAG pulsed laser beam on dental hard tissue and pulp

    Science.gov (United States)

    Vignato, Costantino; Vignato, Giuseppe; Nardelli, Antonella; Baldan, Arianna; Mason, Pier N.

    1994-09-01

    The purpose of this study was to determine histological and ultrastructural modifications produced by an Nd:YAG pulsed laser beam after an in vivo exposure of human molars. Using a Nd:YAG pulsed laser beam delivered by a 600 micrometers optical fiber and concurrent air and water cooling spray, 14 human third molars with artificial first class cavities were exposed at different power levels (6, 7, and 8 W). All the teeth were extracted at different time periods between 10 and 25 days and prepared for histological examination. The results of the histological examination showed no evidence of degeneration or necrosis of the pulpar tissue. Analysis of the dentinal surfaces after exposure demonstrated that the dentinal tubules are completely closed due to the melted dentin. In conclusion a Nd:YAG pulsed laser beam with an air and water cooling spray is safe for treatments of class I decay and no necrosis or degeneration of the pulp was found for laser powers of 6, 7, and 8 W.

  18. Granuloma periapical: tratamiento convencional. Reporte de un caso

    Directory of Open Access Journals (Sweden)

    Natalia Patricia Harris Ortega

    2014-03-01

    Full Text Available Title: Periapical granuloma: conventional treatment. Case reportLos Granulomas radiculares son lesiones periapicales crónicas, consideradas secuelas directas de procesos infecciosos resultantes de la necrosis pulpar, extendiéndose hacia la región perirradicular. Los granulomas se pueden presentar por fallas en los tejidos duros, resultantes de caries, fracturas y procedimientos quirúrgicos. Se realizó tratamiento de endodoncia convencional con preparación invertida a paciente de 15 años con diagnóstico de Granuloma periapical (periodontitis apical asintomáticay su posterior recuperación de la lesión de órgano dentario 36. (DUAZARY 2013 No. 2, 141 - 144AbstractRoot granulomas are chronic periapical lesions, considered direct sequels of infectious processes resulting from pulp necrosis, extending into the periradicular region. The granulomas can occur due to failures in hard tissues, resulting from caries, fractures and surgical procedures. A conventional endodontic treatment was done with crown down technique in a patient of 15 years old with a diagnosis of periapical granuloma (chronic nonsuppurative apical periodontitis and subsequent recovery from injury in tooth 36.Keywords: periapical granuloma; periapical periodontitis (MESH Database.

  19. Seguridad del paciente en Radioterapia Intraoperatoria: Impacto de los elementos controlados por el Radiofisico

    Science.gov (United States)

    Tarjuelo, Juan Lopez

    Introduccion: En la administracion de la radioterapia intervienen profesionales y equipos de tratamiento, por lo que existe el riesgo de error y se precisa que dicho equipamiento funcione conforme a lo esperado. A los radiofisicos les corresponde participar en las actividades de garantia o aseguramiento de la calidad, incluyendo el control de calidad de los equipos, y en la evaluacion de los riesgos asociados. La radioterapia intraoperatoria (RIO) es una tecnica radioterapica de intensificacion de dosis, altamente selectiva, dirigida a volumenes anatomicos restringidos durante el tratamiento quirurgico oncologico, basada en la administracion de una dosis absorbida alta por medio de un haz de electrones tras el examen visual directo del lecho tumoral. Como incorporar los ultimos avances en el refuerzo de la seguridad en radioterapia es una tarea ambiciosa y compleja, resulta mas concreta y de inmediata aplicacion su introduccion en la RIO. El objetivo es analizar los elementos que reducen los riesgos y aumentan la seguridad en la RIO y su dosimetria, y valorar la funcion del radiofisico en esta labor. Material y metodos: Se emplearon el planificador Radiance de GMV y el acelerador lineal de los tratamientos de RIO Elekta Precise, controlado con el verificador diario de haces Daily QA Check 1090 y medido con las camaras de ionizacion PPC 40, FC65-G y FC65-P de PTW-Freiburg, a su vez verificadas con fuentes radiactivas adecuadas de estroncio-90 modelos CDP y CDC de IBA Dosimetry. Se realizo un analisis de modos de fallo y efectos (failure mode and effect analysis, FMEA) con el fin de identificar los elementos que forman la RIO y aplicar las herramientas necesarias para la minimizacion de los riesgos y la mejora de la seguridad en la tecnica. Se estudiaron las verificaciones diarias de dicho acelerador Precise con el control estadistico de procesos (statistical process control, SPC) y se simularon intervenciones para devolverlo al estado llamado en control. El SPC

  20. Daily fluctuations in radon concentration in a Cordoba factory complex; Fluctuaciones diurnas de la concentracion de {sup 222}Rn en el complejo fabril Cordoba

    Energy Technology Data Exchange (ETDEWEB)

    Germanier, A; Perez, R; Rubio, M [CEPROCOR, Cordoba (Argentina)

    1998-07-01

    Full text: This work shows the fluctuations of indoor radon concentration in some rooms placed inside a Cordoba Factory Complex. The measurements were performed by Victoreen Radon Monitor. The system was shaped to sample single radon concentration values after one hour integration. It utilizes a passive diffusion chamber and a silicon diffused junction detector. A portion of decay products will plate-out onto the detector and emit alpha particles into the depletion region of a diffused junction detector. The alpha energy is deposited in the detector in the form of ionization which generates a charge pulse. Only alpha pulses of an energy level similar Po-218 and Po-214 are detected. The study of the meteorological parameters shows that the daily fluctuations of the radon concentration respond to the transport and dispersion processes of radon gas through the air. Air temperature, wind's direction and speed are found to be fundamentals parameters in the observed time behavior. The meteorological data were obtained by a portable station (Davis Weathe Monitor II). The radon concentration present a maximum value (1850 Bq/m{sup 3}) at the night and a minimum value (150 Bq/m{sup 3}) at the day. (author)S. [Spanish] Texto completo: En este trabajo se estudian las fluctuaciones de la concentracion de radon 222 en aire 'indoor' en distintas habitaciones ubicadas dentro y fuera del predio del Complejo Fabril Cordoba (C.F.C.). Las determinaciones se realizaron con un detector pasivo Radon Monitor 05-418, marca Victoreen. El mismo consta de una camara de difusion electrostatica y de un detector de estado solido (Si) de juntura difundida. Este instrumento se configuro para obtener integraciones para cada una de las horas del dia. El principio de funcionamiento del detector se basa en el conteo de los decaimientos {alpha} del polonio 218 y polonio 214 atrapados dentro de la camara de difusion electrostatica. El build-up ocurrido dentro de esta camara es tenido en cuenta para

  1. Perspectives on research and development of microbial fuel cells

    Energy Technology Data Exchange (ETDEWEB)

    Ortega-Martinez, A.; Vazquez Larios, A.L.; Solorza-Feria, O.; Poggi Varaldo, H.M. [Centro de Investigacion y de Estudios Avanzados del IPN, Mexico D.F. (Mexico)]. E-mail: hectorpoggi2001@gmail.com; rareli@hotmail.com

    2009-09-15

    Microbial fuel cells (MFC), is an anoxic electrochemical bioreactor where bacteria grow in the absence of oxygen in a chamber containing an anode which it may be covered by a biofilm. Microorganisms anoxically oxidize the organic substrate and electrons generated are released to the anode. Released protons are transferred to the cathode. Natural or forced aeration of the cathode supplies the oxygen for the final reaction 2H{sup +} + 2e{sup -} + (1/2) O{sub 2} = H{sub 2}O. In this work, we present a critical review on MFC focused on subjects that are receiving a growing interest from the research and technological communities: (i) types of MFC, their relative advantages and disadvantages and ranges of application; (ii) development of biocathodes; (iii) enrichment procedures of microbial communities in MFC. Recent research shows that one-chamber fitted with cathode aerated by natural aeration, and other special types of high performance MFC, have displaced the historical two-chamber MFC. Recent studies showed that electrochemically active bacteria (EAB) can be successfully enriched in MFC. The cost and eventual poisoning of the platinum catalyst used at the cathode is a major limitation to MFC application and economic viability. Researchers have started working on the concept of biocathodes that would use bacteria instead of platinum as a biocatalyst. Microbial enrichment of inocula seeded to MFC may provide a way to enrich the consortium with EAB, thus substantially increasing the transfer of electrons to the anode. Bioaugmentation of consortia in MFC with strains EAB, could contribute to the same goal. [Spanish] Las celdas de combustible microbianas (CCM) son un biorrector anoxico donde las bacterias crecen en ausencia de oxigeno en una camara que contiene un anodo que puede cubrirse con una biopelicula. Los microorganismos oxidan onoxicamente el sustrato organico y los electrones generados se liberan al anodo. Los protones liberados se transfieren al catodo. La

  2. Post Fire Vegetation Recovery in Greece after the large Drought event of 2007

    Science.gov (United States)

    Gouveia, Célia M.; Bastos, Ana; DaCamara, Carlos; Trigo, Ricardo

    2013-04-01

    distinct regions of Mediterranean Europe. Gouveia C., DaCamara C.C, Trigo R.M. (2010). "Post-fire vegetation dynamics in Portugal". Natural Hazards and Earth System Sciences, 10, 4, 673-684. Bastos A., Gouveia C., DaCamara C.C., and Trigo R.M.: Modelling post-fire vegetation recovery in Portugal.Biogeosciences, 8, 4559-4601, 2011.

  3. Atmospheric circulation classification comparison based on wildfires in Portugal

    Science.gov (United States)

    Pereira, M. G.; Trigo, R. M.

    2009-04-01

    Atmospheric circulation classifications are not a simple description of atmospheric states but a tool to understand and interpret the atmospheric processes and to model the relation between atmospheric circulation and surface climate and other related variables (Radan Huth et al., 2008). Classifications were initially developed with weather forecasting purposes, however with the progress in computer processing capability, new and more robust objective methods were developed and applied to large datasets prompting atmospheric circulation classification methods to one of the most important fields in synoptic and statistical climatology. Classification studies have been extensively used in climate change studies (e.g. reconstructed past climates, recent observed changes and future climates), in bioclimatological research (e.g. relating human mortality to climatic factors) and in a wide variety of synoptic climatological applications (e.g. comparison between datasets, air pollution, snow avalanches, wine quality, fish captures and forest fires). Likewise, atmospheric circulation classifications are important for the study of the role of weather in wildfire occurrence in Portugal because the daily synoptic variability is the most important driver of local weather conditions (Pereira et al., 2005). In particular, the objective classification scheme developed by Trigo and DaCamara (2000) to classify the atmospheric circulation affecting Portugal have proved to be quite useful in discriminating the occurrence and development of wildfires as well as the distribution over Portugal of surface climatic variables with impact in wildfire activity such as maximum and minimum temperature and precipitation. This work aims to present: (i) an overview the existing circulation classification for the Iberian Peninsula, and (ii) the results of a comparison study between these atmospheric circulation classifications based on its relation with wildfires and relevant meteorological

  4. Giant ileal inflammatory fibroid polyp: a rare cause of intestinal intussusception

    Directory of Open Access Journals (Sweden)

    Daniel Cury Ogata

    2012-09-01

    Full Text Available Ileal inflammatory fibroid polyp is a rare non-neoplastic lesion of the gastrointestinal tract. Intussusception caused by an inflammatory fibroid polyps is uncommon. The authors report a case of a 75 year-old female patient presenting with ileal obstruction due to intussusception of a polypoid lesion. The patient underwent surgical treatment and histopathology confirmed the diagnosis.Os pólipos fibroides inflamatórios são raras lesões não neoplásicas do trato gastrointestinal e a intussuscepção devido a essa entidade é incomum. Os autores relatam um caso de paciente do sexo feminino, 75 anos, que apresentou obstrução ileal devido a uma intussuscepção por lesão polipoide. A paciente foi submetida a tratamento cirúrgico, sendo diagnosticado pólipo fibroide inflamatório do íleo.

  5. Determinantes dos altos deságios nos leilões de transmissão de energia elétrica no Brasil entre 1999-2010

    Directory of Open Access Journals (Sweden)

    Katia Rocha

    2013-06-01

    Full Text Available O artigo analisa os determinantes dos altos deságios nos leilões de transmissão de energia elétrica no Brasil entre 1999-2010 através de um modelo econométrico baseado em Heckman (1979 considerando a heterogeneidade entre os lances vencedores e perdedores, e a endogeneidade desta clivagem. A partir do conjunto total de lances, explicita-se a heterogeneidade entre os grupos e corrige-se o respectivo viés devido à endogeneidade desta classificação. O objeto de pesquisa se justifica uma vez que estudos que focam apenas nos lances vencedores e que ignoram a correção devido à endogeneidade da seleção do grupo vencedor podem conduzir a conclusões impróprias.

  6. UMA ANÁLISE DO PROTOCOLO DNS E SUAS EXTENSÕES

    Directory of Open Access Journals (Sweden)

    Paulo Renato Lopes Seixas

    2010-08-01

    Full Text Available O estudo do protocolo DNS (Domain Name System faz se necessário devido a sua grande importância para a estabilidade e confiança da internet que hoje conhecemos. O protocolo DNS nativo traz algumas vulnerabilidades intrínsecas em seu protocolo, tais como envenenamento de cache e impersonificação de servidores DNS. Hoje, temos uma extensão segura do protocolo DNS, denominado DNSSEC (Domain Name System Security Extensions, capaz de prover autenticidade nas requisições de DNS, garantindo assim a integridade dos pacotes DNS. Além desta extensão segura, existe outra denominada DNSCurve bem mais robusta porém consome mais recursos, devido todos os pacotes DNS utilizarem criptografia, desde sua origem até o destino.

  7. Determinação das constantes cinéticas de degradação do ácido ascórbico em purê de pêssego: efeito da temperatura e concentração

    OpenAIRE

    Toralles,Ricardo Peraça; Vendruscolo,João Luiz; Vendruscolo,Claire Tondo; Del Pino,Francisco Augusto Burkert; Antunes,Pedro Luiz

    2008-01-01

    O ácido ascórbico, vitamina C, é usado extensivamente na indústria de alimentos, não só devido ao seu valor nutricional, mas devido a suas contribuições funcionais na qualidade do produto. Existem muitos estudos sobre a estabilidade cinética do ácido ascórbico em bebidas, mas nenhum estudo foi encontrado sobre as constantes cinéticas de degradação do ácido ascórbico adicionado em purê de pêssego. Neste trabalho, estudou-se a cinética de degradação do ácido ascórbico em purê de pêssego da cult...

  8. Avaliação da estabilidade da emulsão óleo/água proveniente dos resíduos de uma indústria beneficiadora de gemas frente ao uso de diferentes surfactantes

    OpenAIRE

    Simone Stülp; Max Alan Ritter; Fernanda Cristina Wiedusch Sindelar

    2013-01-01

    A reutilização dos resíduos gerados pelos diversos setores industriais é uma prática que cada dia é mais utilizado, devido ao comprometimento das indústrias com sua responsabilidade social (proteção ao ambiente) ou a exigências dos órgãos de proteção ambiental, já que muitos resíduos não possuem o devido descarte. Na indústria de beneficiamento de gemas a busca pelo reaproveitamento dos resíduos também tem se tornado uma realidade. O presente trabalho tem como objetivo avaliar o reaproveitame...

  9. Produção de refeições e alterações nutricionais nos alimentos

    OpenAIRE

    Torres, Duarte

    2009-01-01

    Durante a produção de refeições, o conteúdo nutricional dos alimentos pode decrescer devido à alteraçãoou degradação química dos nutrientes, ou devido à solubilização e drenagem dos nutrientes dos alimentos para o meio de confecção. Por outro lado, o processamento altera a matriz do alimento original,promovendo o aumento da biodisponibilidade de alguns nutrientes e fitoquímicos. Uma correcta compreensão destes dois fenómenos contribuirá para uma melhor estimativa de ingestão de nutrientes e d...

  10. Estudos quimiométricos em amostras de arroz nacional: caracterização do perfil de aminoácidos e sua correlação com o teor de arsénio

    OpenAIRE

    Lopes, Joel Nuno Rodrigues

    2014-01-01

    O arroz é um dos alimentos básicos mais importantes para a população mundial, sendo um dos cereais mais consumidos em todo o mundo. Possui um alto teor em hidratos de carbono devido à alta concentração de amido, contém ainda proteínas, vitaminas, minerais e poucas gorduras. A quantidade de proteína a ingerir é requisito para uma dieta adequada (0,75g/kg/dia), devido ao desempenho vital que esta tem na saúde humana. O arroz pelo seu papel determinante na alimentação mundial faz com que os ami...

  11. Timpanismo em bovinos, secundário à obstrução esofágica por Citrus limon (limão siciliano)

    OpenAIRE

    Panziera, Welden; Konradt, Guilherme; Bassuino, Daniele M.; Gonçalves, Maiara A.; Driemeier, David

    2016-01-01

    Resumo: Timpanismo ruminal consiste na distensão acentuada do rúmen e retículo, devido a incapacidade do animal em expulsar gases produzidos durante o processo fisiológico da fermentação. O timpanismo pode ser ocasionado de forma primária, por formação de espuma estável, ou secundária, devido a anormalidades funcionais e/ou físicas que interferem na eructação. Nesse trabalho, são descritos os aspectos epidemiológicos, clínicos e anatomopatológicos da ocorrência de timpanismo secundário em bov...

  12. Produção, caracterização bioquímica e aplicação de L-asparaginase fúngica

    OpenAIRE

    Fernanda Furlan Gonçalves Dias

    2016-01-01

    Resumo: L-Asparaginases são enzimas que catalisam a hidrólise da L-asparagina a ácido L-aspártico e amônia. As L-asparaginases microbianas têm recebido atenção devido ao seu papel no tratamento da leucemia linfoblástica aguda e devido à sua crescente aplicação na indústria de alimentos visando à redução da formação de acrilamida durante o processamento de alimentos. Um número crescente de pesquisas tem estudado a aplicação dessa enzima em diferentes matrizes alimentares comprovando seus efeit...

  13. Spatial distribution of bromeliads at "restinga" of Jurubatiba, Macaé, RJ

    OpenAIRE

    Freitas, André F. N.; Cogliatti-Carvalho, Luciana; Van Sluys, Monique; Rocha, Carlos Frederico D.

    2000-01-01

    Nas restingas, devido aos microhábitats favoráveis, como as moitas, não ocorrerem de forma homogênea, mas em manchas, e devido à elevada taxa de reprodução vegetativa em bromélias, testa-se a hipótese de que o padrão de distribuição espacial das bromélias em uma restinga seria agregado. Utiliza-se como área para o teste de hipótese a restinga do Parque Nacional da Restinga de Jurubatiba. Analisa-se o padrão de distribuição espacial de cada espécie encontrada através do índice de dispersão de ...

  14. Avaliação da eficiência de um inibidor comercial livre e dissolvido em microemulsão na corrosão do aço API 5L A210

    OpenAIRE

    Pinheiro, Gleidson Lima

    2014-01-01

    Oleodutos sofrem corrosão do tipo química, devido a tensão, entre outros mecanismos, e eletroquímica devido a grande quantidade de salmoura (água e cloretos), presentes nos fluidos produzidos na formação. Este trabalho tem como objetivo estudar a eficiência de um inibidor de corrosão comercial, usado na indústria do petróleo, na inibição de corrosão agindo isoladamente e em mistura com microemulsão (ME) na proporção [1:1]. A ME foi obtida a partir dos seguintes constituintes: água de torneira...

  15. Klebsiella pneumoniae ESBL formando esferoplastos em sedimento urinário a fresco sem coloração

    OpenAIRE

    Poloni, José Antonio Tesser; Meinerz, Gisele; Monteiro, Alexandre de Almeida; Keitel, Elizete; Rotta, Liane Nanci

    2016-01-01

    Resumo Um homem de 60 anos de idade foi submetido a transplante renal em 2013 devido à insuficiência renal crônica causada por hipertensão. Ele teve episódios recorrentes de infecção do trato urinário e veio para o hospital devido a 4 dias de febre, dor abdominal, ardência para urinar e náusea. Análise do sedimento urinário revelou um quadro de infecção (> 50 leucócitos/campo de grande aumento associado à bacteriúria maciça). O sedimento urinário revelou elementos alongados com um alargamento...

  16. Aplicação do princípio jurídico da precaução no processo administrativo de liberação dos cultivares e dos transgênicos LL62 e GM Embrapa 5.1

    OpenAIRE

    SOUSA, Narliane Alves de Souza e

    2012-01-01

    O atual panorama vivenciado pela sociedade, sob a ótica do melhoramento genético, em especial a dos vegetais, atrai o questionamento sobre aplicação do Princípio Jurídico da Precaução, isto devido à incerteza científica dos possíveis danos que estes podem deflagrar em longo prazo. Assim, devido às alterações nas condições do meio ambiente e por efeito necessário na saúde do ser humano pelo uso da Biotecnologia trouxe o principal objeto do presente trabalho, que é analisar o Pri...

  17. Contratos bilaterais em mercados de energia elétrica multiagente: protocolo de rede de contratos

    OpenAIRE

    Fragoso, Frederico Parente

    2015-01-01

    O setor elétrico tem assistido a mudanças profundas na sua estrutura e organização, devido à sua liberalização, o que levou a uma maior competitividade nos mercados de energia elétrica. Uma gestão eficiente dos mercados de energia torna-se cada vez mais uma prioridade devido aos riscos que estes podem apresentar, aliado à elevada volatilidade dos preços e volumes nos diferentes períodos horários (incertezas na produção e consumo). A liberalização do setor elétrico levou à criação de sim...

  18. Afasia global sem hemiparesia: relato de caso Global aphasia without hemiparesis: case report

    OpenAIRE

    MARCUS TULIUS TEIXEIRA DA SILVA; JOSÉ LUÍS DE SÁ CAVALCANTI; DENISE MADEIRA MOREIRA

    2000-01-01

    Afasia global geralmente é acompanhada por hemiparesia direita devido à extensão da lesão subjacente. Recentemente têm sido registrados na literatura casos em que tal síndrome ou não se acompanha do déficit motor ou este é apenas transitório, sendo esta condição conhecida como afasia global sem hemiparesia (AGSH). Relatamos caso de AGSH devido a infarto cerebral embólico cardiogênico, corroborando a tese de que esta condição pode ter valor preditivo para o diagnóstico de infartos embólicos.Sy...

  19. Equilíbrio líquido-líquido na produção de biodiesel

    OpenAIRE

    Carvalho, Sónia Andreia do Espírito Santo

    2007-01-01

    O aumento do preço dos combustíveis fósseis associado à diminuição das reservas tem desencadeado um crescente interesse em combustíveis alternativos, especialmente os de fontes renováveis devido à sua sustentabilidade, como é o caso do biodiesel. O biodiesel é uma alternativa excelente aos combustíveis convencionais devido não só às suas excelentes propriedades combustíveis mas também pelo facto de ser biodegradável e reduzir a emissão de gases tóxicos para a atmosfera como ...

  20. Uso de grãos de pólen na identificação de plantas e para examinar a participação de nicho alimentar entre beija-flores no Sul do Brasil

    OpenAIRE

    Chupil, Henrique

    2013-01-01

    Resumo: A teoria sugere que espécies que ocupam o mesmo nicho não devem ser simpátricas devido a exclusão competitiva. Como consequência disso, para que espécies potencialmente competidoras coexistam e partilhem o recurso disponível, é necessário que separem-se temporalmente ou espacialmente. Este processo propõe explicar vários componentes da estrutura das assembleias de beija-flores, devido à importância e à especialização em um recurso (néctar). Para testarmos se a sobreposição de nicho al...

  1. Externalidades da substituição do diesel pelo etanol no transporte público urbano da Região Metropolitana de São Paulo

    OpenAIRE

    Thelma Lopes da Silva Lascala

    2011-01-01

    A Matriz Energética Brasileira é plenamente sustentável tendo em vista as emissões de gases de efeito estufa (GEEs), devido ao fato da eletricidade de origem hídrica, bem como do uso do etanol da cana-de-açúcar utilizado em veículos automotivos leves. A maioria das emissões dos GEEs no Brasil vem do desmatamento da Amazônia. Contudo, o uso do óleo diesel especialmente para o transporte (caminhão e ônibus) ainda é um problema a ser resolvido, não apenas devido à emissão de carbono, mas também,...

  2. Manejo clínico de la resorción dental interna utilizando agregad o trióxido mineral como material de obturación intracanal

    Directory of Open Access Journals (Sweden)

    Alvaro Francisco Negrete Barbosa

    2013-10-01

    Full Text Available ResumenLa resorción dental interna es una patología poco común, asintomática, que por lo general es detectada accidentalmente en una radiografía de rutina; su etiología es desconocida pero se cree que puede ser producida por trauma, persistencia de una pulpitis crónica, aparatología ortodóntica, entre otras causas. Aunque esta patología es poco frecuente, el endodoncista no puede pasar por alto el conocimiento de esta y mucho menos su tratamiento, ya que de este, depende que la patología se detenga o siga avanzando, debido a que la acción resortiva está ligada a cierto grado de vitalidad pulpar; después de la eliminación del tejido pulpar en órganos dentarios con este tipo de patología, se debe pensar que material es el ideal para poder obturar la cavidad de forma elíptica o redondeada que origina este tipo de resorción. Desde la salida del MTA (agregado trióxido mineral ya hace tiempo, este asume múltiples usos en la práctica endodontica, debido a sus grandes ventajas y propiedades en comparación con otros materiales presentes en el mercado, es por esto que se convierte en un material de elección para la obturaciónde estas cavidades de tipo resortivo, junto con una copiosa irrigación con hipoclorito de sodio y la conformación biomecánica de los conductos. En el siguiente artículo mostraremos el manejo clínico de un premolar superior con dos conductos subobturados y una resorción dental interna, en el cual se utiliza agregado trióxido mineral como material obturador intracanal. (DUAZARY 2010, 239 - 246Palabras clave: Diente premolar; endodoncia; resorción dentaria; obturación del conducto radicular; MTA.AbstractThe internal dental resorption is a rare disease, asymptomatic, which is usually detected accidentally on a radiograph routine; its etiology is unknown but is believed to be produced trauma, persistent chronic pulpits, orthodontic, among other causes. Although this condition is rare, the endodontist

  3. Histologic evaluation of pulpotomy performed with ethyl-cyanoacrylate and calcium hydroxide Avaliação histológica de pulpotomia realizada com etil-cianoacrilato e com hidróxido de cálcio

    Directory of Open Access Journals (Sweden)

    Diana Santana de Albuquerque

    2006-09-01

    Full Text Available The aim of this study was to evaluate histological aspects of the pulp-dentin complex of dogs submitted to pulpotomy and capped with ethyl-cyanoacrylate and calcium hydroxide. Thirty dog teeth were divided into 2 groups of 15 as follows: Group 1 - ethyl-cyanoacrylate; Group 2 - calcium hydroxide. The pulpotomies were carried out following all of the treatment precautions recommended for dogs. After 30 days the specimens were submitted to histological preparation and were then blindly evaluated by a histologist. Data were analyzed statistically by the Fisher exact test, comparing the two groups. After 30 days, the presence of a hard tissue barrier was observed in 83.3% of Group 1, and in 100% of Group 2 (p = 0.478. A continuous hard tissue barrier was observed in 50% of the ethyl-cyanoacrylate group and 75% of the calcium hydroxide group (p = 0.652. It can be concluded that both materials induced hard tissue barrier formation, but Group 2 had a higher percentage than Group 1, with no significant statistical differences; the differences observed between the different barriers (continuous/non-continuous were not significant between groups and there was no pulpal necrosis in either group.O objetivo do presente estudo foi avaliar o aspecto histológico do complexo dentino-pulpar de cachorros quando capeado após a pulpotomia com etil-cianoacrilato e hidróxido de cálcio. Trinta dentes de cães foram divididos em 2 grupos de 15 da seguinte forma: Grupo 1 - Etil-cianoacrilato; Grupo 2 - Hidróxido de cálcio. A pesquisa foi realizada tomando-se todos os cuidados recomendados para o tratamento com os cães. Após 30 dias do procedimento realizado os espécimes foram submetidos ao preparo histológico e logo após foram avaliados de forma cega por um histologista. Os resultados foram analisados estatisticamente através do Teste Exato de Fisher. No grupo 1, 83,3% e no grupo 2, 100% dos dentes apresentaram a barreira de tecido duro (p = 0,478. A barreira

  4. Staphylococcus cohnii spp urealyticus: relato de caso de um patógeno incomum

    OpenAIRE

    d'Azevedo,Pedro Alves; Antunes,Ana Lúcia Sousa; Martino,Marinês Dalla Valle; Pignatari,Antonio Carlos Campos

    2008-01-01

    Staphylococcus coagulase negativos tem surgido como importantes agentes em infecções de pacientes hospitalizados. Neste estudo, relatamos o caso de bacteremia associada a cateter venoso central devido a Staphylococcus cohnii spp urealyticus isolado em hemocultura de um paciente do sexo masculino, 53 anos, internado em hospital geral da cidade de São Paulo. Discutimos nesse relato a dificuldade em identificar rotineiramente esse microrganismo no Laboratório de Microbiologia Clínica. Staphyloco...

  5. Staphylococcus cohnii spp urealyticus: case report on an uncommon pathogen

    OpenAIRE

    d'Azevedo, Pedro Alves [UNIFESP; Antunes, Ana Lúcia Sousa; Martino, Marinês Dalla Valle; Pignatari, Antonio Carlos Campos [UNIFESP

    2008-01-01

    Staphylococcus coagulase negativos tem surgido como importantes agentes em infecções de pacientes hospitalizados. Neste estudo, relatamos o caso de bacteremia associada a cateter venoso central devido a Staphylococcus cohnii spp urealyticus isolado em hemocultura de um paciente do sexo masculino, 53 anos, internado em hospital geral da cidade de São Paulo. Discutimos nesse relato a dificuldade em identificar rotineiramente esse microrganismo no Laboratório de Microbiologia Clínica. Staphyloco...

  6. Tratamento de rânula pela marsupialização: relato de caso = Treatment of ranula by marsupialization: report of a case

    Directory of Open Access Journals (Sweden)

    Leite Segundo, Airton Vieira

    2006-01-01

    Full Text Available Rânula é uma lesão de etiologia traumática que normalmente desenvolve-se devido à ruptura de um ou mais ductos das glândulas salivares, resultando num extravasamento ou retenção do muco no assoalho da boca. O presente artigo tem como objetivo descrever um caso de rânula acompanhado do seu tratamento por meio da técnica de marsupialização

  7. Achado incidental de glândula sebácea em colo uterino: provavelmente um processo metaplásico An incidental finding of sebaceous glands in the uterine cervix: a probable metaplastic process

    Directory of Open Access Journals (Sweden)

    Daniel Cury Ogata

    2012-06-01

    Full Text Available As glândulas sebáceas ectópicas são achados muito infrequentes no trato genital feminino. Descrevemos um caso que ocorreu em paciente de 42 anos de idade, submetida à histerectomia total, devido à leiomiomatose e ao prolapso uterino.The ectopic sebaceous glands have been extremely rare findings in female genital system. We describe the case of 42 years-old patient with total hysterectomy due to leiomyomatosis and uterine prolapsed.

  8. Retroflexão de bexiga. Relato de caso em Blastocerus dichotomus (Cervo-do-Pantanal

    Directory of Open Access Journals (Sweden)

    Gilson Hélio Toniollo

    2004-04-01

    Full Text Available A retroflexão de bexiga foi objeto de estudo em cervídeo atendido no Hospital Veterinário da FCAV-Unesp-Jaboticabal-SP. Uma fêmea gestante do criatório da Faculdade apresentou prolapso de bexiga e de reto. A cesariana foi efetuada, porém sem sucesso para ambos. Após esse procedimento, o animal foi sacrificado devido ao comprometimento total da bexiga.

  9. Metabolismo do ácido fólico na malária

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    Aymoré Vaz Pinto

    1983-06-01

    Full Text Available O estudo de 27 pacientes infectados pelo Plasmodium falciparum comparado com pessoas aparentemente sadias mostra: a diminuição do folato no soro dos pacientes infectados; b diminuição do folato sêrico nos primeiros 8 dias que seguiram ao tratamento, interpretados como sendo devido à mobilização pela eritropoiese compensadora; c folato eritrocítico normal.

  10. Arroz: composição e características nutricionais Rice: composition and nutritional characteristics

    Directory of Open Access Journals (Sweden)

    Melissa Walter

    2008-08-01

    Full Text Available Devido à importância do arroz na dieta, sua composição e suas características nutricionais estão diretamente relacionadas à saúde da população. Este cereal constitui-se em fonte de energia, devido ao alto teor de amido, fornecendo também proteínas, lipídios, vitaminas e minerais. O presente trabalho de revisão objetivou examinar a composição do arroz, suas características nutricionais e o melhoramento destas através da genética. São observadas variações na composição do arroz, tanto devido ao genótipo quanto ao processamento, afetando as características nutricionais. O arroz apresenta efeito positivo na prevenção de diversas doenças crônicas devido a diferentes constituintes, e sua composição vem sendo melhorada através da genética, obtendo-se grãos com características nutricionais mais interessantes.Due to the importance of rice in the diet, its composition and nutritional characteristics are related to human's health. This cereal is a source of energy, due to its high starch content, also providing proteins, lipids, vitamins and minerals. The present review aimed at examining rice composition, its nutritional characteristics, and the improvement of these characteristics through genetic modification. Variations in rice composition are observed due to genotype and processing, affecting nutritional characteristics. Rice has a positive effect on the prevention of several chronic diseases due to different constituents, and its composition has been improved through genetic modifications, resulting in grains with more interesting nutritional characteristics.

  11. Esquistossomose endocervical

    Directory of Open Access Journals (Sweden)

    Badiale Giovana Bachega

    2005-01-01

    Full Text Available Relatamos o caso de uma mulher de 38 anos, assintomática, que procurou atendimento médico devido à infertilidade. No exame ginecológico, observou-se pólipo endocervical de 1,0 x 0,8 x 0,5cm que foi biopsiado. O exame histológico evidenciou granulomas contendo ovos de Schistosoma mansoni.

  12. Cultivo de Spirulina maxima ao ar livre - I. Inverno

    Directory of Open Access Journals (Sweden)

    Rogério Lacaz Ruiz

    1990-12-01

    e noturno indicaram que o melhor período de produção de biomassa durante o dia foi das 8 - 13 h e a produtividade atingiu valor máximo de 8,08 g/metro quadrado/dia. Durante todo o experimento foi necessário adicionar água ao sistema, devido à ausência de chuvas; e o total acrescentado equivaleu a 72,14 mm de chuva.

  13. Investigação micro-Raman de nanotubos de carbono alinhados

    OpenAIRE

    Cristiano Fantini Leite

    2001-01-01

    A espectroscopia Raman é uma ferramenta experimental muito útil no estudo das propriedades unidimensionais dos nanotubos de carbono, uma vez que através dela é possível investigar os espectros vibracionais e também a estrutura eletrônica dos nanotubos. Devido ao fato dos nanotudos serem sistemas unidimensionais, o espectro Raman polarizado de amostras de nanotubos de carbono alinhados é muito útil para o entendimento de suas propriedades de simetria. Neste trabalho, realizamos experimentos de...

  14. Functional classification of grasp strategies used by hemiplegic patients.

    Directory of Open Access Journals (Sweden)

    Alicia García Álvarez

    Full Text Available This study aimed to identify and qualify grasp-types used by patients with stroke and determine the clinical parameters that could explain the use of each grasp. Thirty-eight patients with chronic stroke-related hemiparesis and a range of motor and functional capacities (17 females and 21 males, aged 25-78, and 10 healthy subjects were included. Four objects were used (tissue packet, teaspoon, bottle and tennis ball. Participants were instructed to "grasp the object as if you are going to use it". Three trials were video-recorded for each object. A total of 456 grasps were analysed and rated using a custom-designed Functional Grasp Scale. Eight grasp-types were identified from the analysis: healthy subjects used Multi-pulpar, Pluri-digital, Lateral-pinch and Palmar grasps (Standard Grasps. Patients used the same grasps with in addition Digito-palmar, Raking, Ulnar and Interdigital grasps (Alternative Grasps. Only patients with a moderate or relatively good functional ability used Standard grasps. The correlation and regression analyses showed this was conditioned by sufficient finger and elbow extensor strength (Pluri-digital grasp; thumb extensor and wrist flexor strength (Lateral pinch or in forearm supinator strength (Palmar grasp. By contrast, the patients who had severe impairment used Alternative grasps that did not involve the thumb. These strategies likely compensate specific impairments. Regression and correlation analyses suggested that weakness had a greater influence over grasp strategy than spasticity. This would imply that treatment should focus on improving hand strength and control although reducing spasticity may be useful in some cases.

  15. Tres casos de odontomas

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    Salvador Javier Santos Medina

    2015-03-01

    Full Text Available Los odontomas son los tumores odontogénicos más comunes, casi siempre se diagnostican accidentalmente, en exámenes radiográficos; pueden sospecharse al retardar el brote dentario o producir maloclusiones. Se clasifican en odontomas compuestos y complejos, ambos constituidos por estructuras dentales como: esmalte, dentina, cemento y tejido pulpar. Su eliminación quirúrgica y la biopsia es el tratamiento de elección. El propósito de este trabajo es reportar tres casos de pacientes atendidos en el Hospital Pediátrico de Las Tunas, todos remitidos previamente por el ortodoncista. El primero, tipo compuesto, en un escolar de 9 años de edad, masculino, asociado a un 31 retenido; el segundo caso se trata de un gran odontoma complejo en una escolar de 11 años de edad, femenina, que produjo interferencia en el brote del 11 y el tercero compuesto; en un escolar de 10 años, masculino, en la línea media entre 11 y 21, con producción de diastema y brote del 12 por palatino. De ellos uno fue descubierto por un examen radiográfico de rutina y los otros dos sospechados por la maloclusión secundaria; todos se trataron quirúrgicamente. Estos casos demuestran la frecuencia de estos tumores en la cavidad bucal y la importancia de la realización de exámenes clínicos y radiográficos para su detección y tratamiento precoz, así como la importancia de la interrelación entre el ortodoncista y el maxilofacial en la resolución satisfactoria de esta entidad

  16. Optimization of the etch-and-rinse technique: New perspectives to improve resin-dentin bonding and hybrid layer integrity by reducing residual water using dimethyl sulfoxide pretreatments.

    Science.gov (United States)

    Stape, Thiago Henrique Scarabello; Tjäderhane, Leo; Abuna, Gabriel; Sinhoreti, Mário Alexandre Coelho; Martins, Luís Roberto Marcondes; Tezvergil-Mutluay, Arzu

    2018-04-13

    To determine whether bonding effectiveness and hybrid layer integrity on acid-etched dehydrated dentin would be comparable to the conventional wet-bonding technique through new dentin biomodification approaches using dimethyl sulfoxide (DMSO). Etched dentin surfaces from extracted sound molars were randomly bonded in wet or dry conditions (30s air drying) with DMSO/ethanol or DMSO/H 2 O as pretreatments using a simplified (Scotchbond Universal Adhesive, 3M ESPE: SU) and a multi-step (Adper Scotchbond Multi-Purpose, 3M ESPE: SBMP) etch-and-rinse adhesives. Untreated dentin surfaces served as control. Bonded teeth (n=8) were stored in distilled water for 24h and sectioned into resin-dentin beams (0.8mm 2 ) for microtensile bond strength test and quantitative interfacial nanoleakage analysis (n=8) under SEM. Additional teeth (n=2) were prepared for micropermeability assessment by CFLSM under simulated pulpar pressure (20cm H 2 O) using 5mM fluorescein as a tracer. Microtensile data was analyzed by 3-way ANOVA followed by Tukey Test and nanoleakage by Kruskal-Wallis and Dunn-Bonferroni multiple comparison test (α=0.05). While dry-bonding of SBMP produced significantly lower bond strengths than wet-bonding (padhesives to demineralized air-dried dentin beyond conventional wet-bonding. Less porous resin-dentin interfaces with higher bond strengths on air-dried etched dentin were achieved; nonetheless, overall efficiency varied according to DMSO's co-solvent and adhesive type. DMSO pretreatments permit etched dentin to be air-dried before hybridization facilitating residual water removal and thus improving bonding effectiveness. This challenges the current paradigm of wet-bonding requirement for the etch-and-rinse approach creating new possibilities to enhance the clinical longevity of resin-dentin interfaces. Copyright © 2018 The Academy of Dental Materials. Published by Elsevier Inc. All rights reserved.

  17. Compósito de colágeno com silicato e hidroxiapatita como material para endodontia: preparação e caracterização = Collagen composite with silicate and hydroxyapatite as endodontic material: preparation and characterization

    Directory of Open Access Journals (Sweden)

    E'Gues, Miguel Antônio Menezes

    2008-01-01

    Full Text Available Objetivo: Este trabalho teve por objetivo preparar e caracterizar um novo compósito de colágeno com silicato e hidroxiapatita que possa vir a ser utilizado como material endodôntico em capeamento pulpar direto e em pulpotomia. Metodologia: Os materiais utilizados como matéria-prima foram colágeno do tipo I na forma aniônica, silicato (cimento Portland Branco e hidroxiapatita sintetizada. Estes materiais foram misturados em proporções variadas de modo a obter um material compósito na forma de pasta. Os materiais obtidos foram caracterizados por técnicas de calorimetria exploratória diferencial, termogravimetria, microscopia eletrônica de varredura (MEV, espectrometria de dispersão de energia de Raios-X e espectroscopia na região do infravermelho. Resultados: A presença de colágeno no compósito foi demonstrada por transições térmicas típicas daquelas encontradas para o colágeno do tipo I (~48ºC, independentemente da proporção utilizada, e também por imagens de MEV, onde as fibras colagênicas também puderam ser observadas interligando as partículas de silicato. A composição química de todos compósitos de colágeno foi praticamente idêntica à do silicato utilizado. Conclusão: Os resultados mostraram que a estrutura da matriz de colágeno nos compósitos testados não foi alterada. Esta é uma característica importante para a utilização em endodontia do material compósito proposto, objetivando uma reparação tecidual de forma "mais natural"

  18. Estudo longitudinal do sucesso clínico-radiográfico de dentes tratados com medicação intracanal de hidróxido de cálcio

    Directory of Open Access Journals (Sweden)

    Mauro Juvenal Nery

    Full Text Available INTRODUÇÃO: O tratamento endodôntico é de fundamental importância para abolir a infecção presente em dentes que apresentam necrose pulpar. OBJETIVO: O objetivo do presente estudo foi avaliar clínica e radiograficamente a eficácia dos tratamentos de canais radiculares de dentes com lesão periapical crônica, efetuados pelos graduandos em Odontologia, da Faculdade de Odontologia de Araçatuba - UNESP. MATERIAL E MÉTODO: Foram selecionados 100 pacientes que possuíam dentes com lesão periapical crônica para serem tratados. Após o preparo biomecânico, os canais radiculares receberam uma medicação intracanal de hidróxido de cálcio durante o período de 14 dias. Os canais radiculares foram obturados com cimento endodôntico à base de hidróxido de cálcio. Foi realizada a proservação por um período entre oito e 11 meses. RESULTADO: A análise dos resultados permitiu constatar a porcentagem de 78,46% dos casos com reparo total da lesão periapical e de 21,54% dos casos em que não houve evidências de reparo. CONCLUSÃO: Ocorreu reparo das lesões periapicais nos dentes tratados pelos graduandos da Faculdade de Odontologia de Araçatuba - UNESP.

  19. Empleo de la terapia láser en la reparación ósea periapical

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    MARÍA I. GARRIGÓ ANDREU

    1997-06-01

    Full Text Available El efecto bioestimulante de la radiación láser de baja potencia en el tejido óseo, se ha comprobado en cultivos de células y animales de experimentación. El objetivo de esta investigación fue evaluar dicho efecto en la reparación ósea periapical. Se atendieron 40 pacientes que presentaban procesos periapicales crónicos, a los que se les realizó tratamiento pulpo radicular y láser. Para la terapia láser, se útilizó la técnica puntual en el área lesionada y laserpuntura, con depósitos energéticos de 15 J/cm² y 7 J/cm², respectivamente. Los resultados obtenidos demuestran que existió aceleración en los procesos de reparación ósea periapical al utilizar la terapia láser, pues en el 67,5 % de los pacientes atendidos, la misma ocurrió en un período menor a 6 meses después de iniciado el tratamiento.The biostimulant effect of low energy laser radiation on the bone tissue has been tested in cell cultures and experimental animals. The objective of our investigation was to evaluate this effect on the periapical bone reparation. 40 patients received attention and underwent radicular, pulpar, and laser treatment. The acupuncture points technique in the injured area and the laserpuncture were used as part of the laser terapy with energetic depots of 15 J/cm² and 7 J/cm², respectively. The results show that the processes of periapical bone reparation were accelerated, since in 67.5 % of these patients it took place in less than 6 months.

  20. Tooth alterations in areas of bisphosphonate-induced osteonecrosis.

    Science.gov (United States)

    de Camargo Moraes, Paulo; Silva, Carolina Amália Barcellos; Soares, Andresa Borges; Passador-Santos, Fabrício; Corrêa, Maria Elvira Pizzigatti; de Araújo, Ney Soares; de Araújo, Vera Cavalcanti

    2015-03-01

    Osteonecrosis of the jaw is a potential side effect when using bisphosphonates. Most studies on the effects of bisphosphonates on teeth have been conducted in vitro or in animal models of tooth development. Therefore, the aim of this study was to describe alterations found in human teeth extracted from areas of bisphosphonate-induced osteonecrosis. Using a retrospective study design, 16 teeth from 13 patients were extracted from areas of bisphosphonate-induced osteonecrosis during surgical debridement. The specimens were decalcified and embedded in paraffin. A series of 5-μm sections were prepared, stained with hematoxylin and eosin (H&E) and observed under a light microscope. The majority of the patients were female (53.85 %), with a mean age of 60.23 ± 13.18 years. Zoledronate (IV) was the most common bisphosphonate used (92.3 %), over a mean period of 2 years. The commonest alteration observed was hypercementosis (87.5 %), followed by pulpar necrosis (81.25 %), pulp stones attached to the dentine and loose pulp stones in the pulp chamber and root canals in addition to linear calcifications (68.75 %), dentinoid/osteoid material formation (18.75 %), and dental ankylosis (6.25 %). Patients undergoing bisphosphonate therapy present diverse tooth alterations, which should be closely monitored by clinicians to prevent complications. It is paramount that the teeth involved in oral lesions are always examined. Attention should be drawn to the need to establish preventive measures, in terms of dental treatment, for patients prior to starting bisphosphonate therapy.

  1. Analysis and simulation of heat transfer in human tooth during the curing of orthodontic appliance and food ingestion

    Directory of Open Access Journals (Sweden)

    J Velazquez-Lopez

    2016-01-01

    Full Text Available The aim of this study was to analyze and simulate the heat transfer in the human tooth undergoing fixed orthodontic appliances and food intake. An in vivo representative mathematic model of a layered thermographic profile was developed during the LED curing of Gemini bracket 0.022 in slot (conventional ligating system and Transbond XT adhesive. The characterization of the layered thermic response allowed to identify if during the LED curing process, according to manufacturer's specification (light curing unit, adhesive can induce pulpar necrosis. The profile's thermographic model was the simulation basis of many conditions such as food intake, due to in vivo metrology is affected by the impossibility of a correct apparatus position and the physiologic function of the oral cavity which is exposed to uncontrollable temperature changes. The metrology was carried out with a T-440 thermographic camera during LED curing bracket, using a LED curing light (Elipar S10 placed at 3 ± 1 mm for 5 s at each mesial and distal surface. The thermography outcomes were analyzed in the FLIR Tools Software, Microsoft Excel 2013 and SPSS 22. To adjust the mathematic model error, in vitro studies were performed on third molars for the purpose of realizing extreme exposition temperature condition tests caused by the LED curing unit without jeopardizing the human tooth vitality as would it be on in vivo experimentation. The bracket curing results according to manufacturer's conditions reached 39°C in vivo temperatures and 47°C on in vitro tests, which does not jeopardize human tooth vitality as said by previous researches, although, an LED curing precise protocol established by the manufacturer's LED curing light is sustained.

  2. Metaloproteinasas de la matriz extracelular (mmps en Odontología

    Directory of Open Access Journals (Sweden)

    Vanesa Pereira Prado

    Full Text Available Resumen La mayoría de los tejidos del organismo se encuentran en un constante proceso de renovación, modulado por una vasta cantidad de proteínas que inducen la síntesis y degradación tisular a lo largo del tiempo. Las metaloproteinasas de la matriz extracelular (MMPs son una familia de 25 endopeptidasas zinc dependientes encargadas de escindir los componentes inmediatos de la matriz extracelular (MEC. Ciertas metaloproteinasas de la matriz extracelular, especialmente MMP-2 y MMP-9, se ven implicadas en el desarrollo del germen dental así como con la proliferación e invasión de los tumores odontogénicos, siendo un factor a considerar sobre la posible agresividad tumoral y la base para el tratamiento de los mismos. A su vez, ambas MMPs actúan en la progresión de las lesiones cariosas así como en progresión de la periodontitis apical de pacientes con necrosis pulpar. Varios patógenos periodontales, promueven la secreción tanto de MMP-2 como MMP-9 favoreciendo la destrucción de los tejidos periodontales, íntimamente relacionadas con el avance de la enfermedad. En pacientes bajo tratamiento ortodóncico se encuentran altos niveles de estas MMPs, tanto en zonas de compresión como de tensión, relacionando los movimientos dentales con la renovación de los tejidos. Esta revisión analiza su expresión y utilidad relacionándolas con diferentes disciplinas en el área de las ciencias odontológicas, enfatizando su potencial como biomarcadores

  3. A long-term study on the clinical effects of mechanical widening of cheek teeth diastemata for treatment of periodontitis in 202 horses (2008-2011).

    Science.gov (United States)

    Dixon, P M; Ceen, S; Barnett, T; O'Leary, J M; Parkin, T D; Barakzai, S

    2014-01-01

    Cheek teeth diastemata are a common cause of painful periodontal disease in horses, but there is limited objective information on their treatment. To assess the long-term response to diastema widening in clinically affected horses. Retrospective study. Medical records from cases of cheek teeth diastemata treated by diastema widening referred to the University of Edinburgh Equine Hospital from 2008 to 2011 were analysed. During this period, 302 horses were diagnosed with clinically significant cheek teeth diastemata, of which 202, median age 11 years, with severe associated periodontitis were treated by widening of 674 problematic diastemata; 89.8% between mandibular cheek teeth and 10.2% between maxillary cheek teeth, with a mean of 1.5 treatments performed per case. These 202 cases showed quidding in 76.2%; weight loss in 33.2%; bitting problems in 20.1% and halitosis in 10.9%, with 5.4% being asymptomatic. Follow-up of 92% of treated cases, a mean of 20.8 months after their initial treatment, showed that 72.6% had complete remission of clinical signs that was permanent (for the duration of this study) in 50.5% and temporary in 22%. A partial response was obtained in 17.2%, no response was obtained in 4.3%, and owners were unsure of response in 5.9%. Clinical improvement was sometimes delayed, with 19% taking >4 weeks following treatment for improvement. Inappropriate sites were burred in individual teeth of 6 horses, causing iatrogenic pulpar exposure in 2 cases, but following treatment none developed clinical signs of apical infection. Diastema widening is an effective but potentially invasive treatment for horses with cheek teeth diastemata with severe periodontitis. Diastema widening by trained personnel is suitable for advanced cases of cheek teeth diastema, but many cases require repeated treatments. © 2013 EVJ Ltd.

  4. Conservação de recursos genéticos animais através de biotécnicas de reprodução - doi: 10.5102/ucs.v6i1.591

    Directory of Open Access Journals (Sweden)

    Priscila de Melo Costa

    2008-12-01

    Full Text Available A conservação de recursos genéticos é uma alternativa para diminuir a perda contínua dos animais devido a degradação ambiental. O ápice da conservação exige estratégias in situ e ex situ, para que sejam mantidas as populações ainda existentes no meio ambiente. Devido as grandes dificuldades da implantação e manutenção de programas de conservação dos animais no seu habitat natural, a conservação ex situ tem ganhado destaque devido sua praticidade. Desta forma, esta revisão teve como objetivo demonstrar a necessidade de criar estratégias para conservação da mastofauna em risco de extinção, especialmente através da utilização das biotécnicas de reprodução animal.

  5. Thermodynamic methodology for the design of solar dryers operated with flat solar collectors; Metodologia termodinamica para el diseno de secadores operados con calentadores solares planos

    Energy Technology Data Exchange (ETDEWEB)

    Torres Reyes, Ernestina; Navarrete Gonzalez, Jose L; Ibarra Salazar, Beatriz A; Picon Nunez, Martin [Instituto de Investigaciones Cientificas, Universidad de Guanajuato, Guanjuato, Guanajuato (Mexico)

    2000-07-01

    In this paper a thermal performance analysis of solar drying process at operating varying conditions is presented. It is described semi-empirical models to thermal characterization of an experimental device. A simulator of thermal performance for operating varying conditions was developed as a part of the procedure of thermal design of solar dryers. On the other hand, it is described a simplified method to design solar collectors based on the determination of minimum entropy generation during the thermal conversion of the solar device by using the thermal analysis procedure established and the method derived of the second law of the Thermodynamics are finally presented. [Spanish] En este trabajo se presenta el analisis termico del comportamiento del sistema -colector solar camara de secado-. Se describen los modelos semi-empiricos con los que se caracterizo termicamente un secador solar experimental del tipo indirecto. Se presenta tambien un procedimiento de diseno de equipo de secado que toma en cuenta las condiciones variables de operacion que presentan los dispositivos solares. Por otro lado se describe un procedimiento simplificado de diseno, basado en un analisis derivado de la segunda ley de la Termodinamica. Esta metodologia se fundamenta en la minima generacion de entropia durante la conversion termica de la energia solar, utilizando colectores solares planos. Finalmente se presentan los resultados del diseno preliminar de equipo de secado utilizando los dos procedimientos mencionados.

  6. Analysis of the Variability of Therapeutic Indications of Medicinal Species in the Northeast of Brazil: Comparative Study

    Directory of Open Access Journals (Sweden)

    Julimery Gonçalves Ferreira Macedo

    2018-01-01

    Full Text Available Ethnopharmacological Relevance. This study aims to evaluate the versatility of these species and their agreement of use and/or the informants’ knowledge and verify the variability of the information on the indicated medicinal species in comparison to other species from northeastern Brazilian areas. Materials and Methods. Ethnobotanical information was acquired through interviews with 23 residents of the Quincuncá community, northeastern Brazil. From the obtained data, a comparative analysis of the therapeutic indications with other 40 areas in different biomes was conducted. For that, the relative importance index and informant consensus factor were calculated and compared to other indices evaluated in the literature. Results. A total of 39 medicinal species were cited and twenty-six species showed similarities among their therapeutic indications; however, species as Geoffroea spinosa, Lantana camara, and others can be highlighted, present in community disease indications that were not verified for other areas. Myracrodruon urundeuva, Mimosa tenuiflora, Stryphnodendron rotundifolium, and Amburana cearensis had the greatest versatility. In the Quincuncá community, medicinal species were indicated for 49 diseases, which were grouped into 15 categories of body systems. Conclusion. This study shows the presented divergence in relation to their therapeutic use; in this point, these divergences reinforce the importance of pharmacological research.

  7. Merger of aspects of the 'Programa Luz para Todos' in the regulation of ANEEL; Incorporacao de aspectos do Programa Luz para Todos na regulacao da ANEEL

    Energy Technology Data Exchange (ETDEWEB)

    Camargo, Ednaldo Jose Silva de [Universidade de Sao Paulo (IEE/USP), SP (Brazil). Inst. de Eletrotecnica e Energia; Ribeiro, Fernando Selles [Universidade de Sao Paulo (USP), SP (Brazil). Escola Politecnica

    2009-07-01

    This study aims to examine the relationship between concessionaire and requesting public service of electric energy from the changes brought about by the 'Programa Luz para Todos', for residents of rural areas. The concept of access to electricity as a right for all Brazilians and as an essential right of citizenship, also studying processing of legislation in order to accomplish this right. Examines the advances offered by the 'Programa Luz para Todos' - both in terms of social inclusion which provides, as the increase in energy demand and consequent increase of the distribution market - which regulation is based on document entitled 'Manual de Operationalizacao' and was formally accepted by utilities to distribute power and cooperatives in rural electrification. Presents a discussion about the same subject under the 'Poder Legislativo', in a bill in the 'Camara Federal' procedure. Demonstrates the existence of a desire for maintaining the progress achieved in various spheres of government. Proposes ANEEL's incorporation of some aspects of the modern setting, in particular with regard to the concept of the 'Ponto de Entrega' as defined in Article 9 of Resolution 456/00. (author)

  8. Assessing Habitat Quality of Forest-Corridors through NDVI Analysis in Dry Tropical Forests of South India: Implications for Conservation

    Directory of Open Access Journals (Sweden)

    Paramesha Mallegowda

    2015-02-01

    Full Text Available Most wildlife habitats and migratory routes are extremely threatened due to increasing demands on forestland and forest resources by burgeoning human population. Corridor landscape in Biligiri Rangaswamy Temple Tiger Reserve (BRT is one among them, subjected to various anthropogenic pressures. Human habitation, intensive farming, coffee plantations, ill-planned infrastructure developments and rapid spreading of invasive plant species Lantana camara, pose a serious threat to wildlife habitat and their migration. Aim of this work is to create detailed NDVI based land change maps and to use them to identify time-series trends in greening and browning in forest corridors in the study area and to identify the drivers that are influencing the observed changes. Over the four decades in BRT, NDVI increased in the core area of the forest and reduced in the fringe areas. The change analysis between 1973 and 2014 shows significant changes; browning due to anthropogenic activities as well as natural processes and greening due to Lantana spread. This indicates that the change processes are complex, involving multiple driving factors, such as socio-economic changes, high population growth, historical forest management practices and policies. Our study suggests that the use of updated and accurate change detection maps will be useful in taking appropriate site specific action-oriented conservation decisions to restore and manage the degraded critical wildlife corridors in human-dominated landscape.

  9. Eriophyid-myte (Acari: Eriophyoidea: Eriophyidae as moontlike beheeragente van ongewenste uitheemse plante in Suid-Afrika

    Directory of Open Access Journals (Sweden)

    C. Craemer

    1996-07-01

    Full Text Available Eriophyid-myte kom waarskynlik op die meeste hoër plante voor en is oor die algemeen baie gasheerspesifiek. Sommiges is skadelik genoeg om oorweeg te word vir biologiese beheerprogramme teen ongewenste plante. Algemene belangstelling in die gebruik van eriophyids vir onkruidbeheer het onlangs ontstaan en vyf spesies is reeds, meestal suksesvol, gebruik vir onkruidbeheer in ander lande. Eriophyid-myte is nog nie as onkruidbeheeragente in Suid-Afrika benut nie. Sewentien spesies wat simptome veroorsaak wat moontlik nuttig kan wees vir die beheer van 12 plantspesies, wat as onkruide in Suid-Afrika beskou word, word gelys en bespreek. Die onkruide is: Acacia saligna (Port Jackson, Acroptilon repens (Russiese dissel, Cardaria draba (peperbos cardaria, Chromolaena odorata (paraffienbos. Convolvulus arvensis (akkerwinde, Cuscuta epithymum (dodder, Hypericum perforatum (St. Janskruid, Lantana camara (lantana, Melia azedarach (sering, Opuntia inermis (doringturksvy, Solanum elaeagnifolium (satansbos, S. mauritianum (luisboom en Spartium junceum (Spaanse besem. Sommige van hierdie eriophyid-spesies kan moontlik suksesvol as onkruidbeheeragente in Suid-Afrika gebruik word en derhalwe is verdere navorsing in hierdie verband geregverdig.

  10. Fuelwood consumption pattern at different altitudes in rural areas of Garhwal Himalaya

    Energy Technology Data Exchange (ETDEWEB)

    Kumar, Munesh [Department of Forestry, HNB Garhwal University, Srinagar, Garhwal 246 174 (India); Sharma, C.M. [Department of Botany, HNB Garhwal University, Post Box 76, Srinagar, Garhwal 246 174 (India)

    2009-10-15

    The use of fuelwood as a primary source of energy for domestic use is causing severe deforestation in Garhwal Himalaya. In the present study fuelwood consumption patterns have been studied in six villages; two each in tropical (Ganga Bhogpur and Kunow), sub-tropical (Bhainswara and Ghargoan) and temperate (Dhaulana and Chunnikhal) regions under various ecological and socio-economic conditions. The total average fuelwood consumption in the present study was observed to be highest for Ganga Bhogpur (2.52 kg per capita per day) in the tropical region, whereas, lowest for Ghargoan (1.63 kg per capita per day) in the sub-tropical region. The labour energy expenditure for fuelwood collection was greatest for Dhaulana (146.62 MJ per capita per day) in the temperate region, and lowest for Ganga Bhogpur (88.80 MJ per capita per day) in the tropical region. The fuelwood consumption rate oscillated considerably across the different seasons. The tree and shrub species preferred by the inhabitants for fuelwood were Holoptelea integrifolia, Anogeissus latifolia and Lantana camara in the tropical region; A. latifolia, Acacia catechu and Carissa spinarum in the sub-tropical region; and Quercus leucotrichophora, Myrica esculenta and Pyracantha crenulata in the temperate region, respectively. (author)

  11. Metal temperature monitoring in corrosive gases at high temperature and high thermal flows; Monitoreo de temperaturas de metal en gases corrosivos a alta temperatura y altos flujos termicos

    Energy Technology Data Exchange (ETDEWEB)

    Huerta Espino, Mario; Martinez Flores, Marco Antonio; Martinez Villafane, Alberto; Porcayo Calderon, Jesus; Gomez Guzman, Roberto; Reyes Cervantes, Fernando [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1990-12-31

    The direct measurement of metal temperatures during operation in superheater, reheater, and water wall tubes in zones exposed to high thermal flows is of great interest for the operation and analysis of the correct functioning of a steam generator. The operation temperature measurement of these zones differs very much of the monitored temperature in headers in the dead chamber, since the temperature measured in this zone is the steam temperature that does not reflect the one detected in the gas zone. For this reason, the thermocouples implant in gas zones will detect the real metal temperature and the incidence that some operation variables might have on it (Martinez et al., (1990). [Espanol] La medicion directa de temperaturas de metal durante operacion en tubos de sobrecalentador, recalentador y pared de agua en zonas expuestas a altos flujos termicos es de gran interes para la operacion y analisis del buen funcionamiento de un generador de vapor. La medicion de la temperatura de operacion de estas zonas, difiere mucho de la temperatura monitoreada en cabezales en zona de camara muerta, ya que la temperatura registrada en esta zona es la de vapor que no es un reflejo de la detectada en zona de gases. Por esta razon, la implantacion de termopares en zona de gases detectara la temperatura de metal real y la incidencia que algunas variables de operacion tengan sobre esta (Martinez et al., 1990).

  12. Argentina's chemical makers seek government support

    International Nuclear Information System (INIS)

    Salles, F.

    1993-01-01

    Argentina's chemical industry association, Camara de la Industria Quimica y Petroquimica (CIQYP; Buenos Aires), has started negotiations with the government aiming to stem industry-wide losses, which reached $236 million during the past 18 months. CIQYP blames the poor performance on worldwide over-supply and falling prices, which have curbed exports, and low tariffs, which have spurred imports. It is calling for higher import tariffs and export incentives. The talks will also focus on a possible bond issue that would support companies willing to restructure and modernize operations. The main factor hindering competitiveness is what CIQYP president Alejandro Achaval calls Argentinean cost, including high energy costs, high provincial and federal taxes, and high financing charges. Since 1988, the industry has cut prices by 30%, formed mergers and joint ventures, closed 11 plants and started five new ones, slashed the workforce by 27%, and engaged in the government's privatization program. Meanwhile, plans to privatize 64% of aromatics producer Petroquimica General Mosconi(PGM) were derailed when potential bidders Diamond Shamrock, Shell, and Perez Companc refused for the second time to make offers on February 2. Jorge Olazabal, planning secretary of the Ministry of Defense, says PGM will be put up for sale again by March

  13. Invasive, naturalized and casual alien plants in southern Africa: a sum­mary based on the Southern African Plant Invaders Atlas (SAPIA

    Directory of Open Access Journals (Sweden)

    L. Henderson

    2007-08-01

    Full Text Available The primary objective of this publication is to provide an overview of the species identity, invasion status, geographical extent, and abundance of alien plants in South Africa, Swaziland and Lesotho, based on field records from 1979 to the end of 2000. The dataset is all the species records for the study area in the Southern African Plant Invaders Atlas (SAPIA database during this time period. A total of 548 naturalized and casual alien plant species were catalogued and invasion was recorded almost throughout the study area. Most invasion, in terms of both species numbers and total species abundance, was recorded along the southern, southwestern and eastern coastal belts and in the adjacent interior. This area includes the whole of the Fynbos and Forest Biomes, and the moister eastern parts of the Grassland and Savanna Biomes. This study reinforces previous studies that the Fynbos Biome is the most extensively invaded vegetation type in South Africa but it also shows that parts of Savanna and Grassland are as heavily invaded as parts of the Fynbos. The Fabaceae is prominent in all biomes and Acacia with 17 listed species, accounts for a very large proportion of all invasion. Acacia mearmii was by far the most prominent invasive species in the study area, followed by A. saligna, Lantana camara, A. cyclops, Opuntia ficus-indica. Solarium mauritianum, Populus alba/xcanescens, Melia azedarach, A. dealbata and species of Prosopis.

  14. EVALUACION DE LA RESISTENCIA A LA CORROSION DEL SISTEMA PRIMER EPOXICO RICO EN ZINC/ACABADO POLISILOXANO POR MEDIO DE ESPECTROSCOPIA DE IMPEDANCIA ELECTROQUIMICA

    Directory of Open Access Journals (Sweden)

    ANDRES ALBERTO GUZMAN ROSAS

    2011-01-01

    Full Text Available En este trabajo fue estudiado el sistema primer epoxico rico en zinc / acabado polisiloxano aplicado sobre laminas de acero al carbono laminado en caliente y sometido a camaras de corrosion acelerada (inmersion total, niebla salina, ciclo de corrosion y prohesion por un periodo de hasta 5000 horas. Las probetas bajo estudio se evaluaron cada 20 dias por medio de espectroscopia de impedancia electroquimica y al final de la prueba se realizaron chequeos visuales y microscopia optica para ver la morfologia de la interface metal-recubrimiento y microespectroscopia Raman para identificar la presencia de posibles productos de corrosion. Los resultados de impedancia fueron simulados por medio de circuitos electricos equivalentes. Para el sistema se encontraron modulos de impedancia del orden de 1011 ¿.cm2 en prohesion, 1010 ¿.cm2 en ciclo de corrosion, 109 ¿.cm2 tanto niebla salina como en las inmersiones totales (NaCl 10-2M y Na2SO4 10-2M. Este sistema tuvo durante el tiempo de pruebas un comportamiento excelente con altas resistencias de pelicula y de transferencia de carga y bajas capacitancias de pelicula y de doble capa.

  15. Metal temperature monitoring in corrosive gases at high temperature and high thermal flows; Monitoreo de temperaturas de metal en gases corrosivos a alta temperatura y altos flujos termicos

    Energy Technology Data Exchange (ETDEWEB)

    Huerta Espino, Mario; Martinez Flores, Marco Antonio; Martinez Villafane, Alberto; Porcayo Calderon, Jesus; Gomez Guzman, Roberto; Reyes Cervantes, Fernando [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1991-12-31

    The direct measurement of metal temperatures during operation in superheater, reheater, and water wall tubes in zones exposed to high thermal flows is of great interest for the operation and analysis of the correct functioning of a steam generator. The operation temperature measurement of these zones differs very much of the monitored temperature in headers in the dead chamber, since the temperature measured in this zone is the steam temperature that does not reflect the one detected in the gas zone. For this reason, the thermocouples implant in gas zones will detect the real metal temperature and the incidence that some operation variables might have on it (Martinez et al., (1990). [Espanol] La medicion directa de temperaturas de metal durante operacion en tubos de sobrecalentador, recalentador y pared de agua en zonas expuestas a altos flujos termicos es de gran interes para la operacion y analisis del buen funcionamiento de un generador de vapor. La medicion de la temperatura de operacion de estas zonas, difiere mucho de la temperatura monitoreada en cabezales en zona de camara muerta, ya que la temperatura registrada en esta zona es la de vapor que no es un reflejo de la detectada en zona de gases. Por esta razon, la implantacion de termopares en zona de gases detectara la temperatura de metal real y la incidencia que algunas variables de operacion tengan sobre esta (Martinez et al., 1990).

  16. IIE`s wind tunnel calibration; Calibracion del tunel de viento del IIE

    Energy Technology Data Exchange (ETDEWEB)

    Pena Garcia, Raymundo [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1986-12-31

    The calibration of a wind tunnel is performed in such a way as to warrant a very low turbulence grade. When there is recently built tunnel, as is the case of the IIE`s tunnel, the turbulence in its testing chambers is large; for this reason it is necessary to integrate in it aerodynamic devices and elements capable of reducing it. At the end of the calibration studies can be performed in models with controlled scale. From these and from the results obtained it will be decided if the designed prototypes are built or modified. [Espanol] La calibracion de un tunel de viento se realiza de tal forma que garantiza un grado de turbulencia muy bajo. Cuando se tiene un tunel recien construido, como es el caso del tunel de viento del IIE, la turbulencia en sus camaras de prueba es grande; por lo que es necesario integrarle dispositivos y elementos aerodinamicos que sean capaces de reducirla. Al terminar la calibracion pueden realizarse estudios en modelos con escala controlada. De estos y de los resultados que se obtengan se decidira si se construyen o se modifican los prototipos disenados.

  17. Substrate temperature study in the crystallinity of BaTiO{sub 3} thin films; Estudio de la temperatura de crecimiento sobre la cristalinidad en peliculas delgadas de BaTiO{sub 3}

    Energy Technology Data Exchange (ETDEWEB)

    Marquez-Herrera, Alfredo [Coordinacion Academica Region Altiplano (COARA), Universidad Autonoma de San Luis Potosi, San Luis Potosi (Mexico)]. E-mail: amarquez@mixteco.utm.mx; Hernandez-Rodriguez, Eric Noe; Zapata-Torres, Martin Guadalupe [Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, Unidad Legaria, Instituto Politecnico Nacional (Mexico)]. E-mails: noehmx@hotmail.com; mzapatat@ipn.mx; Cruz-Jauregui, Maria de la Paz [Centro de Nanociencias y Nanotecnologia, Universidad Nacional Autonoma de Mexico (Mexico)]. E-mail: mcruz@cnyn.unam.mx; Melendez-Lira, Miguel angel [Centro de Investigacion y de Estudios Avanzados, Instituto Politecnico Nacional (Mexico)]. E-mail: mlira@fis.cinvestav.mx

    2013-07-15

    Ferroelectric thin films of BaTiO{sub 3} (BTO) were grown on quartz and nichrome substrates using a BaTiO{sub 3} target by RF-Sputtering technique. It was studied the effect of the substrate temperature in the crystallization of the material. These samples were compared with films deposited at room temperature and heat treated out of the growth Chamber. Their crystallinity were studied by X-ray diffraction. Additionally, the optical characterizations were carried out by UV-Vis spectrophotometer. The growth of thin films with substrate temperature allows the obtaining of crystalline materials at temperatures below those reported by other authors. [Spanish] Peliculas delgadas Ferroelectricas de BaTiO{sub 3} (BTO) se depositaron a partir de un blanco de BaTiO{sub 3} mediante la tecnica de RF-Sputtering (erosion catodica por radio frecuencia) sobre substratos de nicromel y cuarzo. Se estudio el efecto de la temperatura de sustrato in-situ en la cristalinidad del material durante su deposito. Estas muestras fueron comparadas con peliculas depositadas a temperatura ambiente y tratadas termicamente posterior al deposito fuera de la camara de crecimiento. El estudio de la cristalinidad fue realizado mediante la tecnica de difraccion de rayos-X. Adicionalmente, se llevaron a cabo caracterizaciones opticas mediante un espectrofotometro UV-Vis. El crecimiento de peliculas delgadas con temperatura de sustrato permite la obtencion de materiales cristalinos a temperaturas por debajo de las reportadas por otros autores.

  18. Weedy lignocellulosic feedstock and microbial metabolic engineering. Advancing the generation of 'Biofuel'

    Energy Technology Data Exchange (ETDEWEB)

    Chandel, Anuj K. [Jawaharlal Nehru Technological Univ., Hyderabad (India). Centre of Biotechnology; Singh, Om V. [Pittsburgh Univ., Bradford, PA (United States). Div. of Biological and Health Sciences

    2011-03-15

    Lignocellulosic materials are the most abundant renewable organic resources ({proportional_to}200 billion tons annually) on earth that are readily available for conversion to ethanol and other value-added products, but they have not yet been tapped for the commercial production of fuel ethanol. The lignocellulosic substrates include woody substrates such as hardwood (birch and aspen, etc.) and softwood (spruce and pine, etc.), agro residues (wheat straw, sugarcane bagasse, corn stover, etc.), dedicated energy crops (switch grass, and Miscanthus etc.), weedy materials (Eicchornia crassipes, Lantana camara etc.), and municipal solid waste (food and kitchen waste, etc.). Despite the success achieved in the laboratory, there are limitations to success with lignocellulosic substrates on a commercial scale. The future of lignocellulosics is expected to lie in improvements of plant biomass, metabolic engineering of ethanol, and cellulolytic enzyme-producing microorganisms, fullest exploitation of weed materials, and process integration of the individual steps involved in bioethanol production. Issues related to the chemical composition of various weedy raw substrates for bioethanol formation, including chemical composition-based structural hydrolysis of the substrate, need special attention. This area could be opened up further by exploring genetically modified metabolic engineering routes in weedy materials and in biocatalysts that would make the production of bioethanol more efficient. (orig.)

  19. Evaluation of the Larvicidal Efficacy of Five Indigenous Weeds against an Indian Strain of Dengue Vector, Aedes aegypti L. (Diptera: Culicidae)

    Science.gov (United States)

    Sharma, Aarti; Kumar, Sarita; Tripathi, Pushplata

    2016-01-01

    Background and Objectives. Aedes aegypti, dengue fever mosquito, is primarily associated with the transmission of dengue and chikungunya in tropical and subtropical regions of the world. The present investigations were carried out to assess the larvicidal efficiency of five indigenous weeds against Ae. aegypti. Methods. The 1,000 ppm hexane and ethanol extracts prepared from the leaves and stem of five plants (Achyranthes aspera, Cassia occidentalis, Catharanthus roseus, Lantana camara, and Xanthium strumarium) were screened for their larvicidal activity against early fourth instars of dengue vector. The extracts which could cause 80–100% mortality were further investigated for their efficacy. Results. The preliminary screening established the efficacy of hexane extracts as compared to the ethanol extracts. Further investigations revealed the highest larvicidal potential of A. aspera extracts exhibiting LC50 value of 82.555 ppm and 68.133 ppm, respectively. Further, their leaf extracts showed 5–85.9% higher larvicidal activity and stem extracts exhibited 0.23- to 0.85-fold more efficiency than the other four extracts. Conclusion. The present investigations suggest the possible use of A. aspera as an ideal ecofriendly, larvicidal agent for the control of dengue vector, Ae. aegypti. Future studies are, however, required to explore and identify the bioactive component involved and its mode of action. PMID:26941996

  20. Evaluation of the Larvicidal Efficacy of Five Indigenous Weeds against an Indian Strain of Dengue Vector, Aedes aegypti L. (Diptera: Culicidae

    Directory of Open Access Journals (Sweden)

    Aarti Sharma

    2016-01-01

    Full Text Available Background and Objectives. Aedes aegypti, dengue fever mosquito, is primarily associated with the transmission of dengue and chikungunya in tropical and subtropical regions of the world. The present investigations were carried out to assess the larvicidal efficiency of five indigenous weeds against Ae. aegypti. Methods. The 1,000 ppm hexane and ethanol extracts prepared from the leaves and stem of five plants (Achyranthes aspera, Cassia occidentalis, Catharanthus roseus, Lantana camara, and Xanthium strumarium were screened for their larvicidal activity against early fourth instars of dengue vector. The extracts which could cause 80–100% mortality were further investigated for their efficacy. Results. The preliminary screening established the efficacy of hexane extracts as compared to the ethanol extracts. Further investigations revealed the highest larvicidal potential of A. aspera extracts exhibiting LC50 value of 82.555 ppm and 68.133 ppm, respectively. Further, their leaf extracts showed 5–85.9% higher larvicidal activity and stem extracts exhibited 0.23- to 0.85-fold more efficiency than the other four extracts. Conclusion. The present investigations suggest the possible use of A. aspera as an ideal ecofriendly, larvicidal agent for the control of dengue vector, Ae. aegypti. Future studies are, however, required to explore and identify the bioactive component involved and its mode of action.

  1. Quality Characteristics of Wholemeal Flour and Bread from Durum Wheat (Triticum turgidum L subsp. durum Desf.) after Field Treatment with Plant Water Extracts.

    Science.gov (United States)

    Carrubba, Alessandra; Comparato, Andrea; Labruzzo, Andrea; Muccilli, Serena; Giannone, Virgilio; Spina, Alfio

    2016-09-01

    The use of selected plant water extracts to control pests and weeds is gaining growing attention in organic and sustainable agriculture, but the effects that such extracts may exert on the quality aspects of durum wheat are still unexplored. In 2014, 5 plant water extracts (Artemisia arborescens, Euphorbia characias, Rhus coriaria, Thymus vulgaris, Lantana camara) were prepared and distributed on durum wheat cv Valbelice to evaluate their potential herbicidal effects. After crop harvesting, the major physicochemical and technological parameters of wholemeal flours obtained from each treatment were measured and compared with those from chemical weeding and untreated controls. A baking test was also performed to evaluate the breadmaking quality. In wholemeal flours obtained after the treatment with plant extracts protein and dry gluten content were higher than in control and chemical weeding. Wholemeal flours obtained after chemical weeding reached the highest Mixograph parameters, and that from durum wheat treated with R. coriaria extract demonstrated a very high α-amylase activity. We concluded that the treatments with plant water extracts may influence many quality traits of durum wheat. This occurrence must be taken into account in overall decisions concerning the use of plant extracts in pest and weed management practice. © 2016 Institute of Food Technologists®

  2. In vitro antifugal activity of medicinal plant extract against Fusarium oxysporum f. sp. lycopersici race 3 the causal agent of tomato wilt.

    Science.gov (United States)

    Isaac, G S; Abu-Tahon, M A

    2014-03-01

    Medicinal plant extracts of five plants; Adhatoda vasica, Eucalyptus globulus, Lantana camara, Nerium oleander and Ocimum basilicum collected from Cairo, Egypt were evaluated against Fusarium oxysporum f. sp. lycopersici race 3 in vitro conditions using water and certain organic solvents. The results revealed that cold distilled water extracts of O. basilicum and E. globulus were the most effective ones for inhibiting the growth of F. oxysporum f. sp. lycopersici. Butanolic and ethanolic extracts of the tested plants inhibited the pathogen growth to a higher extent than water extracts. Butanolic extract of O. basilicum completely inhibited the growth of F. oxysporum f. sp. lycopersici at concentrations 1.5 and 2.0% (v/v). Butanolic extracts (2.0%) of tested plants had a strong inhibitory effect on hydrolytic enzymes; β-glucosidase, pectin lyase and protease of F. oxysporum f. sp. lycopersici. This study has confirmed that the application of plant extracts, especially from O. basilicum for controlling F. oxysporum f. sp. lycopersici is environmentally safe, cost effective and does not disturb ecological balance. Investigations are in progress to test the efficacy of O. basilicum extract under in vivo conditions.

  3. Methodology for the accelerated simulation of the deterioration that by atmospheric corrosion appears in electronic equipment; Metodologia para la simulacion acelerada del deterioro que por corrosion atmosferica se presenta en equipo electronico

    Energy Technology Data Exchange (ETDEWEB)

    Ortiz Prado, A.; Schouwenaars, R.; Cerrud Sanchez, S.M. [Facultad de Ingenieria, UNAM, Mexico, D.F. (Mexico)

    2002-12-01

    The corrosion resistance of systems and electronic parts which are designed to work in atmospheric conditions have been tested for decades; some of these methods were the Cyclic Humidity Test, Field Tests and Salt Spray (Fog) Testing, the latter was one of the most popular methods. However, the salt spray test and most of the other existing methods do not show strong relationships with the real conditions of service. For this reason, it is necessary to develop appropriated methods and equipment for the accelerated simulation of real atmospheric corrosion phenomena. This article seeks to demonstrate the need to develop a test and the necessary equipment to reproduce the damage in electronic systems and equipment by atmospheric corrosion. [Spanish] Para la evaluacion de la resistencia a la corrosion de sistemas y equipo electronico que trabajaran bajo condiciones de deterioro generadas por el medio ambiente, se han aplicado una serie de ensayos, donde el mas popular es el de camara de niebla salina. Sin embargo, este y otros que se han elaborado para tal efecto no tienen ninguna relacion con las condiciones reales de servicio, por lo que es necesario un metodo de evaluacion que permita simular de forma acelerada los fenomenos de deterioro por efectos ambientales. Este articulo pretende demostrar la necesidad de desarrollar una prueba, que en forma acelerada, reproduzca el dano que sufre el material por efecto de la atmosfera; el cual se orienta a la evaluacion de equipo electrico y electronico.

  4. Comparison of Anthropometry and Lower Limb Power Qualities According to Different Levels and Ranking Position of Competitive Surfers.

    Science.gov (United States)

    Fernandez-Gamboa, Iosu; Yanci, Javier; Granados, Cristina; Camara, Jesus

    2017-08-01

    Fernandez-Gamboa, I, Yanci, J, Granados, C, and Camara, J. Comparison of anthropometry and lower limb power qualities according to different levels and ranking position of competitive surfers. J Strength Cond Res 31(8): 2231-2237, 2017-The aim of this study was to compare competitive surfers' lower limb power output depending on their competitive level, and to evaluate the association between competition rankings. Twenty competitive surfers were divided according to the competitive level as follows: international (INT) or national (NAT), and competitive ranking (RANK1-50 or RANK51-100). Vertical jump and maximal peak power of the lower limbs were measured. No differences were found between INT and NAT surfers in the anthropometric variables, in the vertical jump, or in lower extremity power; although the NAT group had higher levels on the elasticity index, squat jumps (SJs), and counter movement jumps (CMJs) compared with the INT group. The RANK1-50 group had a lower biceps skinfold (p RANK1-50 group. Moderate to large significant correlations were obtained between the surfers' ranking position and some skinfolds, the sum of skinfolds, and vertical jump. Results demonstrate that surfers' physical performance seems to be an accurate indicator of ranking positioning, also revealing that vertical jump capacity and anthropometric variables play an important role in their competitive performance, which may be important when considering their power training.

  5. Search for antibacterial and antifungal agents from selected Indian medicinal plants.

    Science.gov (United States)

    Kumar, V Prashanth; Chauhan, Neelam S; Padh, Harish; Rajani, M

    2006-09-19

    A series of 61 Indian medicinal plants belonging to 33 different families used in various infectious disorders, were screened for their antimicrobial properties. Screening was carried out at 1000 and 500 microg/ml concentrations by agar dilution method against Bacillus cereus var mycoides, Bacillus pumilus, Bacillus subtilis, Bordetella bronchiseptica, Micrococcus luteus, Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, Streptococcus faecalis, Candida albicans, Aspergillus niger and Saccharomyces cerevisiae. Twenty-eight plant extracts showed activity against at least one of the test organisms used in the screening. On the basis of the results obtained, we conclude that the crude extracts of Dorema ammoniacum, Sphaeranthus indicus, Dracaena cinnabari, Mallotus philippinensis, Jatropha gossypifolia, Aristolochia indica, Lantana camara, Nardostachys jatamansi, Randia dumetorum and Cassia fistula exhibited significant antimicrobial activity and properties that support folkloric use in the treatment of some diseases as broad-spectrum antimicrobial agents. This probably explains the use of these plants by the indigenous people against a number of infections.

  6. IIE`s wind tunnel calibration; Calibracion del tunel de viento del IIE

    Energy Technology Data Exchange (ETDEWEB)

    Pena Garcia, Raymundo [Instituto de Investigaciones Electricas, Cuernavaca (Mexico)

    1985-12-31

    The calibration of a wind tunnel is performed in such a way as to warrant a very low turbulence grade. When there is recently built tunnel, as is the case of the IIE`s tunnel, the turbulence in its testing chambers is large; for this reason it is necessary to integrate in it aerodynamic devices and elements capable of reducing it. At the end of the calibration studies can be performed in models with controlled scale. From these and from the results obtained it will be decided if the designed prototypes are built or modified. [Espanol] La calibracion de un tunel de viento se realiza de tal forma que garantiza un grado de turbulencia muy bajo. Cuando se tiene un tunel recien construido, como es el caso del tunel de viento del IIE, la turbulencia en sus camaras de prueba es grande; por lo que es necesario integrarle dispositivos y elementos aerodinamicos que sean capaces de reducirla. Al terminar la calibracion pueden realizarse estudios en modelos con escala controlada. De estos y de los resultados que se obtengan se decidira si se construyen o se modifican los prototipos disenados.

  7. Commentary: Racism and Bias in Health Professions Education: How Educators, Faculty Developers, and Researchers Can Make a Difference.

    Science.gov (United States)

    Karani, Reena; Varpio, Lara; May, Win; Horsley, Tanya; Chenault, John; Miller, Karen Hughes; O'Brien, Bridget

    2017-11-01

    The Research in Medical Education (RIME) Program Planning Committee is committed to advancing scholarship in and promoting dialogue about the critical issues of racism and bias in health professions education (HPE). From the call for studies focused on underrepresented learners and faculty in medicine to the invited 2016 RIME plenary address by Dr. Camara Jones, the committee strongly believes that dismantling racism is critical to the future of HPE.The evidence is glaring: Dramatic racial and ethnic health disparities persist in the United States, people of color remain deeply underrepresented in medical school and academic health systems as faculty, learner experiences across the medical education continuum are fraught with bias, and current approaches to teaching perpetuate stereotypes and insufficiently challenge structural inequities. To achieve racial justice in HPE, academic medicine must commit to leveraging positions of influence and contributing from these positions. In this Commentary, the authors consider three roles (educator, faculty developer, and researcher) represented by the community of scholars and pose potential research questions as well as suggestions for advancing educational research relevant to eliminating racism and bias in HPE.

  8. Butterflies (Lepidoptera: Papilionoidea and Hesperioidea visiting flowers in the Botanical Garden of the Federal University of Santa Maria, Santa Maria, RS, Brazil

    Directory of Open Access Journals (Sweden)

    Ana Beatriz Barros de Morais

    2008-12-01

    Full Text Available Urban environments, such as parks and gardens, may offer many alimentary resources, besides shelter and favorable conditions, for butterfly survival. This study aimed to make an inventory of butterflies visiting flowers in the Botanical Garden of the Federal University of Santa Maria (UFSM. From March 2006 to March 2007, the floral visitors were observed weekly for 2h. After 108 hours’ observations, 1114 visits by 39 butterfly species, associated with 43 plant species (21 families, were confirmed. Among the butterflies, Nymphalidae had the highest richness of species (S= 18, followed by Hesperiidae (S= 8, Pieridae (S= 7, Papilionidae (S= 4 and Lycaenidae (S= 2. The pierid Phoebis philea philea was the most frequent species (188 visits, followed by hesperiids Urbanus proteus proteus (100, U. teleus (73 and the nymphalid Heliconius erato phyllis (71. Lantana camara (Verbenaceae, Eupatorium laevigatum (Asteraceae, Russelia equisetiformis (Scrophulariaceae and Stachytarpheta cayennensis (Verbenaceae were the most visited plants. The Botanical Garden of UFSM is an example of an urban park that seems to provide floral resources for the feeding of many butterfly species, being also a potential refuge for species from forest areas nearby.

  9. The invasive alien plants threatened the balance of ecosystem in conservative area in Ontoloe Island, Flores-Indonesia

    Science.gov (United States)

    Antonius Mboka Segu Wake, Ignatius; Retnaningsih Soeprobowati, Tri; Jumari

    2018-05-01

    Invasive alien plants threaten to biodiversity, particularly in small island with high endemicity values such as Ontoloe Island, a tourist destination area of Riung Seventeen Island in Flores. The study aims to characterized the invasive plants have attacked the conservative area in Ontoloe Island. The method used by combining the line method and the plot method with three observation stations in utilization block and four observation station in protection block. Plot of 1mx1m was used for the observation of ground cover plants and seedling, 5mx5m for the observation in stake level, 10mx10m for the observation in pole level, 20mx20m for the observation in tree level. The data level of the plants obtained then analyzed with Important Value Index (IVI). Result showed that Lamtoro plants (Leuchaena leucocephala) is the invasive alien species which has the highest IVI in both of utilization block and protection block in each level of tree, stake, and pole. There are other invasive alien plants such as Tembeleken (Lantana camara) and Bidara (Zizipus mauritiana) dominated in stake level and Alang-alang (Imperata cylindrica) dominated in seedling level. All the native plants in Ontoloe Island will be threatened their existing because of the less control of invasive alien plants. Therefore, needs serious handling by the government in order to keep the balanced of the ecosystems in Ontoloe Island to be maintained especially to not deviated from management objectives area of Komodo Dragons conservation (Varanus komodoensis Ouwens, 1912).

  10. NASALIZATION IN BRAZILIAN PORTUGUESE: AN AUTOSEGMENTAL (REVIEW

    Directory of Open Access Journals (Sweden)

    Consuelo de Paiva Godinho COSTA

    2015-06-01

    Full Text Available We propose to make a brief review on nasalization phenomena studies in Portuguese, aiming the phonological process of nasal harmonization that occurs in the variety of Brazilian Portuguese spoken in Vitória da Conquista-BA and region, a phenomenon hitherto not described for any Portuguese dialect. To do so, we consider as fundamental, D’Angelis (2002 analysis, which incorporates relevant concepts presented by Trubetzkoy, from the Prague School, and some points of Camara Jr. propose. We also propose to update the discussion with the approaches along the lines of auto segmental phonology, incorporating some insights of Piggott (1992, discussing with other analyzes for nasalization phenomena in other languages, especially Guarani (language of Tupi-Guarani Linguistic Family, as proposed by Costa (2010, which deals with the phonological processes involving nasality and nasal harmony in Brazilian indigenous languages , in order to verify if the researches on nasality phenomena in other languages can shed some light on the processes that occur in Portuguese.

  11. Study of a hybrid solar-electric oven to the curing composite materials used in aeronautics; Estudio de un horno hibrido solar-electrico para el curado de materiales compuestos utilizados en aeronautica

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez Roman, M. A.; Pineda Pinon, J.; Sanchez Sanchez, A. [CICATA - Unidad Queretaro, Santiago de Queretaro, Queretaro (Mexico)]. E-mail: mhernandezr0900@ipn.mx

    2010-11-15

    The study covers the curing of advanced composites in a hybrid solar electric oven. The furnace uses electricity from the grid power and solar energy provided by the heliostat concentrator system. The materials used in the experiments will be composite materials such as prepreg. The prepreg are fiberglass and carbon fiber. The resin used in the pre-impregnate will be epoxy resin. The work temperatures inside the furnace will be maximum 300 degrees Celsius. The obtained results will be useful to characterize the use of the solar energy and the characterize of the curing chamber. [Spanish] Se presenta el alcance para el estudio, el cual abarca el curado de materiales compuestos avanzados dentro de un horno hibrido solar electrico. El horno utilizara energia electrica suministrada por la red y energia solar suministrada por el sistema heliostato concentrador. Los materiales utilizados en los experimentos seran materiales compuestos tipo prepreg. Los prepreg seran de fibra de vidrio y de fibra de carbono. La resina utilizada en el preimpregando sera resina epoxica. Las temperaturas de trabajo dentro del horno seran como maximo de 300 grados centigrados. Los resultados obtenidos serviran para caracterizar el uso y aprovechamiento de la energia solar y la caracterizacion de la camara de curado.

  12. As I see it: a study of African American pastors' views on health and health education in the black church.

    Science.gov (United States)

    Rowland, Michael L; Isaac-Savage, E Paulette

    2014-08-01

    The Black Church is the only institution that has consistently served the interest of African Americans, and there is no other institution in the African American community that rivals its influence (Camara, 2004). The spiritual well-fare, social support, health, and well-being of its people have been one of its main goals. With health disparities of African Americans still at an alarming rate, the Black Church has used informal education as a means to impart knowledge on health, as well as other non-religious and religious topics. One of the avenues least researched within the Black Church is the pastor's perception of its educational role in health and wellness and its efforts to reduce health discrimination and health disparities between African American and European Americans in the U.S. Since social justice appears as a theme and concern in the traditions of many churches, it is only appropriate that, among other things, the Black Church should address the issue of health education and interventions. The purpose of this study was to explore African American pastors' perceptions of the role of the Black Church in providing health care, health education, and wellness opportunities to African Americans. Many pastors reported their church provided some form of health education and/or health screenings. Their perceptions about the important issues facing their congregants versus African Americans in general were quite similar.

  13. Cuantificación de la carga física y psicológica en fútbol profesional: diferencias según el nivel competitivo y efectos sobre el resultado en competición oficial

    Directory of Open Access Journals (Sweden)

    Antonio Jos\\u00E9 G\\u00F3mez-D\\u00EDaz

    2013-01-01

    Full Text Available Este estudio analiza la respuesta que tienen los futbolistas profesionales de diferentes niveles competitivos a los estimulos de entrenamiento y competicion, asi como su relacion con en el rendimiento en partido. Un total de 20 jugadores de nivel Elite (Premier League-1º División Inglesa y 22 jugadores de nivel Sub-elite (Championship Division – 2º División Inglesa tomaron parte en el estudio. Individualmente se monitorizo la carga de entrenamiento a traves del % frecuencia cardiaca maxima (%FCmax, tiempo de entrenamiento segun intensidades y la percepcion subjetivo del esfuerzo (PSE, asi como la carga de competicion mediante el sistema multi-camara ProZoneR durante toda la segunda vuelta de la liga en ambos equipos. La PSE, %FCmax y la distancia recorrida en entrenamiento, asi como la distancia cubierta en partido oficial fueron significativamente inferiores (p < .05 en los jugadores Elite. La PSE, un indicador valido para estimar la carga fisica y psicologica de los jugadores, correlaciono significativamente (p < .05 con el propio rendimiento condicional de entrenamiento y competicion. La distancia cubierta en partido oficial fue significativamente superior (p < .05 cuando obtuvieron victorias en sus encuentros. Los resultados de este estudio sugieren que los futbolistas de clase mundial soportan una menor carga de entrenamiento y competicion, apoyandose en mayor medida en sus habilidades tecnico-tacticas.

  14. High resolution reconstruction of monthly precipitation of Iberian Peninsula using circulation weather types

    Science.gov (United States)

    Cortesi, N.; Trigo, R.; Gonzalez-Hidalgo, J. C.; Ramos, A. M.

    2012-06-01

    Precipitation over the Iberian Peninsula (IP) is highly variable and shows large spatial contrasts between wet mountainous regions, to the north, and dry regions in the inland plains and southern areas. In this work, a high-density monthly precipitation dataset for the IP was coupled with a set of 26 atmospheric circulation weather types (Trigo and DaCamara, 2000) to reconstruct Iberian monthly precipitation from October to May with a very high resolution of 3030 precipitation series (overall mean density one station each 200 km2). A stepwise linear regression model with forward selection was used to develop monthly reconstructed precipitation series calibrated and validated over 1948-2003 period. Validation was conducted by means of a leave-one-out cross-validation over the calibration period. The results show a good model performance for selected months, with a mean coefficient of variation (CV) around 0.6 for validation period, being particularly robust over the western and central sectors of IP, while the predicted values in the Mediterranean and northern coastal areas are less acute. We show for three long stations (Lisbon, Madrid and Valencia) the comparison between model and original data as an example to how these models can be used in order to obtain monthly precipitation fields since the 1850s over most of IP for this very high density network.

  15. CRITERIOS PARA LA SELECCIÓN DE ESPECIES HERBÁCEAS ORNAMENTALES PARA SU USO EN PAISAJISMO

    Directory of Open Access Journals (Sweden)

    Sebastiana Guadalupe Ramírez-Hernández

    2012-01-01

    realizó una recolecta de especies herbáceas silvestres, atractiva por sus características de follaje y flores, en ocho municipios del centro de Veracruz (Huatusco, Tepatlaxco, Coscomatepec, Paso del Macho, Amatlán de los Reyes, Cuitláhuac, Tezonapa y Zongolica en áreas con vegetación poco perturbada. La colecta comprendió un total de 18 especies pertenecientes a 10 familias y 16 géneros, y sin uso actual en el diseño de áreas verdes. Se elaboró un instrumento de valoración del potencial ornamental de las especies, basado en ocho criterios de calificación de sus características morfológico-ecológicas. Cinco de las especies recolectadas fueron calificadas como de alto potencial ornamental. Las especies más sobresalientes fueron: Ruellia coerulea Morong, Cosmos sulphureus, Zinnia elegans L., Salvia coccinea Buc´hoz ex Etl. y Lantana camara L.

  16. The Cobalt-60 Research Facility at Seibersdorf; L'Installation de Recherche sur l'Iradiation au {sup 60}Co de Seibersdorf; Obluchayushchaya ustanovka s istochnikom Kobal'ta-60 reaktornogo tsentra v Zajbersdorfe; La Instalacion Experimental de {sup 60}Co de Seibersdorf

    Energy Technology Data Exchange (ETDEWEB)

    Weidinger, N.; Kaindl, K. [Institute Of Biology And Agriculture, Reactor Centre, Seibersdorf (Austria)

    1966-11-15

    courant, le fonctionnement reste ininterrompu. En cas de defaillance d'un organe important de l'installation ou de dommages imprevus, un systeme d'alarme se declenche. En cas de danger grave, ce dispositif ramene immediatement les sources a leur position de repos; s'il n'y a pas de danger grave, il les laisse a la disposition du specialiste qui decide s'il y a lieu de poursuivre ou non l'irradiation. (author) [Spanish] La instalacion de irradiacion que actualmente se esta construyendo ha sido expresamente disenada para fines de investigacion dentro del marco del programa internacional relativo a la irradiacion de frutas y zumos de fruta. Consta de dos camaras de irradiacion con una capacidad de 30 kCi y de 10 kCi, respectivamente. Con la primera se proyecta irradiar zumos de fruta en una serie de ensayos para determinar su valor alimenticio, y realizar investigaciones sobre tecnologia de la fuente. La segunda camara ha sido disenada especialmente para realizar investigaciones quimicas y microbiologicas, y ofrece condiciones optimas para modificar la posicion y configuracion de la fuente segun las condiciones del experimento. El blindaje biologico es de hormigon ordinario, con una densidad de 2,4 t/m{sup 3} aproximadamente, y la intensidad de dosis en su exterior es de 0,2 mR/h como maximo. En su posicion de reposo, esto es, cuando no se las utiliza, las dos fuentes se encuentran en un cilindro de plomo inserto en el blindaje de hormigon. Una serie de tubos de acero inoxidable - 12 en una camara y 6 en la otra - en los que se ajustan las barras de cobalto, penetran en la camara de irradiacion a traves de un paso de seccion circular. Las barras de {sup 60}Co de la camara de irradiacion de 30 kCi, cada una de las cuales tiene una longitud de 300 mm medida en su exterior, estan constituidas por dos piezas unidas. Una instalacion neumatica permite colocarlas en posicion en unos 5 s, bien individualmente o combinandolas de cualquier forma. Los distintos tubos, con su curvatura

  17. AVALIAÇÃO ECONÔMICA DA IMPLANTAÇÃO DE TURBINAS EÓLICAS POR MEIO DA ANÁLISE DE RISCOS

    Directory of Open Access Journals (Sweden)

    Carolina Rossetto

    2015-12-01

    Full Text Available DOI: 10.12957/cadest.2015.18881Resumo As energias renováveis estão se propagando aceleradamente em países desenvolvidos e emergentes devido à sua forma sustentável e à sua produção limpa. Dentre elas, a energia eólica se destaca pelo mínimo impacto causado ao meio ambiente na construção e instalação de aerogeradores. Nesse contexto, devido ao excelente potencial eólico no Sul do Brasil, o objetivo deste trabalho é realizar uma análise de viabilidade econômica da implantação de um parque eólico a fim de abastecer uma indústria de alimentos e bebidas, localizada no Rio Grande do Sul, tornando-a autoprodutora em energia elétrica. Para este estudo foram utilizados os métodos de análise econômica Valor Presente Líquido (VPL, Taxa Interna de Retorno (TIR e Payback descontado. Os resultados apresentados por estes indicadores mostraram a viabilidade econômica do projeto. Foi estruturada também a análise de riscos do projeto através da Simulação de Monte Carlo, a qual apresentou um potencial elevado de risco envolvido no investimento deste parque eólico, devido, principalmente, à alta sensibilidade do VPL quanto à variabilidade das condições do vento na região em estudo. Palavras-chave: Parque Eólico; Análise de Viabilidade Econômica; Simulação de Monte Carlo.

  18. VULNERABILIDADE E VARIAÇÕES DE CURTO PRAZO DA PRAIA DE ITAIPU (NITERÓI-RJ EM RESPOSTA ÀS MUDANÇAS NAS CONDIÇÕES DE MAR

    Directory of Open Access Journals (Sweden)

    Eduardo Macedo Rodrigues

    2015-03-01

    Full Text Available As praias da enseada de Itaipu na Região Oceânica de Niterói, estado do Rio de Janeiro (Brasil, vêm sendo intensamente modificadas devido ao rápido processo de urbanização dessa região, principalmente a partir da década de 1970 com a construção da ponte Presidente Costa e Silva (Rio-Niterói. A crescente ocupação desse litoral constitui-se no principal fator responsável pela degradação dos ecossistemas costeiros. A praia de Itaipu, apesar de ser a mais interna e, consequentemente a mais abrigada dentro da enseada de Itaipu, apresenta grande variabilidade na largura, em resposta as mudanças de curto prazo nas condições de mar. A faixa de areia da praia estreita-se de forma rápida em resposta a incidência de ondas de tempestades, restabelecendo-se logo a seguir quando do retorno às condições de tempo bom. As maiores variações foram constatadas na extremidade sul, devido à maior vulnerabilidade deste setor a incidência de ondas de tempestades. Os sedimentos da praia são constituídos predominantemente por areia quartzosa média, exceto em lâmina d’água de 5 m devido ao acúmulo de areia média com alto teor de carbonatos. Areia muito fina a fina aparece na profundidade de 7 metros, na área externa ao embasamento cristalino submerso.

  19. Conflito organizacional e gestão de recursos humanos

    OpenAIRE

    Atalho, Pedro Filipe Lourenço do

    2016-01-01

    Códigos do JEL Classification System: JEL: D74 – Conflict; Conflict Resolution; Alliances; JEL: J52 – Dispute Resolution: Strikes, Arbitration, and Mediation; Collective bargaining O conflito é uma realidade quase ubíqua do ambiente organizacional e, devido a um conjunto de mudanças sociais e estruturais, é cada vez mais frequente e mais diverso. Assim, é cada vez mais essencial gerir o conflito de forma estratégica, de forma a não só evitar as suas consequências negativas, ...

  20. Esplenectomia parcial para tratar hemangioma esplênico

    Directory of Open Access Journals (Sweden)

    Andy Petroianu

    Full Text Available Apesar de a esplenectomia ser eficaz na abordagem terapêutica de pacientes com hemangioma esplênico, esse procedimento é acompanhado de elevada morbidade e até mortalidade, principalmente devido à sepse, quando realizado em crianças e adolescentes com sistema imunitário ainda imaturo. Para prevenir os efeitos adversos da asplenia, propõe-se neste artigo a esplenectomia parcial, com a retirada apenas da região do hemangioma, mantendo o restante do baço e preservando suas importantes funções.