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Sample records for acido linoleico conjugado

  1. Efectos de la suplementacion oral con calcio y ácido linoleico conjugado en primigrávidas de alto riesgo.

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    Julián Alberto Herrera

    2009-11-01

    Full Text Available Objetivo: Determinar el efecto de dosis bajas de calcio elemental y ácido linoleico conjugado sobre los niveles plasmáticos de tromboxano B2, insulina, aldosterona, GMP cíclico, proteína C reactiva ultrasensible y la eficacia del tratamiento en la prevención de la hipertensión arterial inducida por el embarazo. Métodos: En un ensayo clínico doble ciego, controlado con placebo se estudiaron a 48 primigrávidas con alto riesgo para desarrollar preeclampsia con dosis diarias de calcio elemental (600 mg y ácido linoleico conjugado (450 mg (n=24 ó 450 mg de talco y 600 mg de lactosa como placebo (n=24 desde la semana 18-22 hasta el parto. Resultados: Dos mujeres en el grupo experimental (8.3% desarrollaron hipertensión arterial inducida por el embarazo comparado con 10 (41.7% mujeres controles (riesgo relativo 0.20, IC 95% 0.05-0.82, p=0.01. No se observaron diferencias entre los niveles plasmáticos después de 4 semanas de tratamiento ni efectos maternos o neonatales en ambos grupos. Conclusiones: La administración de dosis bajas de calcio elemental y ácido linoleico conjugado redujo significativamente la incidencia de hipertensión arterial inducida por el embarazo en mujeres embarazadas de alto riesgo sin efectos colaterales atribuibles a la intervención y sin efecto sobre los niveles de tromboxano B2, insulina, aldosterona, GMP cíclico y la respuesta sistémica inflamatoria.

  2. DIETA HIPERLIPÍDICA E ÁCIDO LINOLEICO CONJUGADO: EFEITOS NOS LIPIDIOS SÉRICOS, PESO E COMPOSIÇÃO CORPORAL DE CAMUNDONGOS APO E(-/-) EXERCITADOS.

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    Silvio Anderson Toledo Fernandes; Instituto Federal do Sudeste de Minas Gerais; Antônio José Natali; Universidade Federal de Viçosa; Bruno Gonzaga Teodoro; Uniersidade Federal de Viçosa; Frederico Souzalima Caldoncelli Franco; Instituto Federal de Educação, Ciência e Tecnologia; Mateus Camaroti Laterza; Universidade Federal de Juiz de Fora; Maria do Carmo Gouveia Pelúzio; Universidade Federal de Viçosa

    2012-01-01

    Introdução: Estratégias têm sido utilizadas para a prevenção de doenças cardiovasculares e aumento de peso. Sendo assim, muito tem sido falado sobre alimentos funcionais e seus efeitos benéficos para a saúde humana e, em especial do Ácido Linoleico Conjugado. Objetivo: Simular condição de indivíduos que fazem atividade física, mas consomem dieta rica em gordura e fazem suplementação com ácido linoléico conjugado (CLA), avaliando os efeitos destes sobre os lipídios séricos, peso e composição c...

  3. Efectos de la suplementacion oral con calcio y ácido linoleico conjugado en primigrávidas de alto riesgo.

    OpenAIRE

    Julián Alberto Herrera; AKM Shahabuddin; Mohamad Faisal; Gao Ersheng; Yuan Wei; Dou Lixia; Timothée Gandaho; Patricio López Jaramillo

    2009-01-01

    Objetivo: Determinar el efecto de dosis bajas de calcio elemental y ácido linoleico conjugado sobre los niveles plasmáticos de tromboxano B2, insulina, aldosterona, GMP cíclico, proteína C reactiva ultrasensible y la eficacia del tratamiento en la prevención de la hipertensión arterial inducida por el embarazo. Métodos: En un ensayo clínico doble ciego, controlado con placebo se estudiaron a 48 primigrávidas con alto riesgo para desarrollar preeclampsia con dosis diarias de calcio elemental (...

  4. Contenido de ácido linoleico conjugado (cla) y composición de ácidos grasos en algunos yogures comerciales de colombia.

    OpenAIRE

    Gutiérrez Álvarez, Luis Felipe; Martínez, Jenny Carolina; Barón Núñez, Marby Rocío

    2011-01-01

    Se estudió la concentración de ácido linoleico conjugado (CLA) de quince yogures de las marcas comerciales de mayor consumo y distribución en el mercado colombiano, así como su composición en ácidos grasos. La concentración de CLA, expresada como mg de ácido cis-9,trans-11 octadecadienoico/g de grasa y como mg de ácido cis-9,trans-11 octadecadienoico/100 g de yogur osciló entre 4,5 y 8,2 y entre 7,8 y 25,5, respectivamente. Los valores de CLA más elevados (>6,0 mg/g de grasa) en los yogure...

  5. El ácido linoleico conjugado disminuye la hipercolesterolemia pero aumenta el riesgo de litiasis biliar Conjugated linoleic acid lowers hypercholesterolemia but increases the risk for biliary lithiasis

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    V. Navarro

    2005-06-01

    Full Text Available El término ácido linoleico conjugado (ALC designa una serie de isómeros del ácido linoleico, presentes en la carne y productos lácteos de rumiantes, que presentan sus dos dobles enlaces en posición conjugada. El objetivo del presente trabajo fue estudiar los efectos de un isómero del ALC, el trans-10, cis-12, sobre la colesterolemia y el riesgo de litiasis biliar en un modelo animal de hipercolesterolemia inducida por dieta. Para ello se utilizaron dos grupos de hámsters alimentados con una dieta hipercolesterolemiante suplementada al 0,5% con ácido linoleico o con el isómero trans-10, cis-12 del ALC, respectivamente. Se midió diariamente su ingesta de alimento y peso corporal y, tras 6 semanas, se obtuvieron muestras de suero y bilis, y se diseccionaron y pesaron sus hígados y bazos. Se determinó la colesterolemia, el contenido hepático y esplénico de colesterol, y la concentración biliar de colesterol, fosfolípidos y sales biliares; se calculó el índice litogénico biliar y se evaluó la presencia de cálculos biliares. El ALC no modificó la ingesta energética, el peso corporal final, ni el tamaño y contenido de colesterol del bazo, pero sí produjo una disminución significativa del colesterol sérico total (-18% a expensas de la fracción c-LDL (-66%, y también redujo significativamente el contenido hepático de colesterol libre (-26%, sin cambios en el colesterol esterificado. Además, el ALC produjo un incremento del 32% de la concentración biliar de colesterol, un aumento del 28% del índice litogénico y una mayor incidencia de litiasis biliar. Por tanto, el presente estudio demuestra que el isómero trans-10, cis-12 del ALC es hipocolesterolemiante debido, al menos en parte, a que aumenta la secreción de colesterol a bilis. En contrapartida, este efecto aumenta el riesgo de litiasis biliar.The term conjugated linoleic acid (CLA refers to a series of linoleic acid isomers present in meat and diary products from

  6. Conjugated linoleic acid and fatty acid binding protein as antioxidants Ácido linoleico conjugado y proteína transportadora de ácidos grasos como antioxidantes

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    V.A. Piergiacomi

    2006-12-01

    Full Text Available Studies were carried out to determine the effect of conjugated linoleic acid (CLA and rat liver cytosolic protein enriched in fatty acid binding protein (FABP on the non-enzymatic lipid peroxidation of rat liver microsomes. The inhibition of lipid peroxidation was more evident when the FABP containing fraction obtained from CLA-group was used with either kind of microsomes (CLA and control. The chemiluminescence and polyunsaturated fatty acid composition of rat liver microsomes changed after CLA treatment. When native and peroxidized microsomes obtained from control group were compared, the most affected polyunsaturated fatty acids were: C18:2, C18:3 and C20:4, while in CLA-group C20:4 was mainly peroxidized The simultaneous analysis of chemiluminescence and fatty acid composition demonstrated that CLA and FABP play a role protecting rat liver microsomes against the harmful effect of lipid peroxidation.El objetivo del trabajo fue determinar el efecto del ácido linoleico conjugado (ALC y de la proteína citosólica de hígado de rata enriquecida en Proteína Transportadora de Ácidos Grasos (PTAG, sobre la peroxidación no enzimática de lípidos de microsomas hepáticos de rata. Luego de la incubación de éstos en un sistema ascorbato-Fe++ se observó que el total de cpm/mg de proteina originada por quimioluminiscencia fue menor en los microsomas obtenidos de las ratas del grupo ALC respecto a los del grupo control. Cuando la fracción PTAG obtenida del grupo ALC fue agregada a la peroxidación de microsomas de ambos grupos de animales ALC y control, la inhibición de la lipoperoxidación fue más evidente. Además se encontró que ambas fracciones PTAG, tanto la obtenida de animales del grupo ALC como la obtenida del grupo control, tuvieron mayor efecto como antioxidantes cuando se usaron microsomas ALC respecto a microsomas control. La composición de ácidos grasos de los microsomas cambió luego del tratamiento con ALC. Comparando

  7. Meta-análise do uso de ácido linoleico conjugado na alimentação de suínos Meta-analysis of conjugated linoleic acid use in pigs feeding

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    Ines Andretta

    2009-07-01

    Full Text Available O objetivo deste trabalho foi realizar uma meta-análise da associação do ácido linoleico conjugado (CLA com o desempenho e a qualidade de carcaça e de carne em suínos (Sus scrofa domesticus. A base de dados utilizada contemplou 15 artigos publicados entre 1999 e 2006, e totalizou 216 dietas e 5.223 animais. A meta-análise foi realizada por meio de análises gráficas (para observar coerência biológica dos dados, de correlação (para identificar variáveis correlacionadas e de variância-covariância. O modelo da análise de variância incluiu apenas as variáveis de carne e carcaça mais correlacionadas com o consumo de CLA pelos animais, além das codificações para os efeitos inter e intra-experimentos. A inclusão do ácido linoleico apresentou correlação negativa com a eficiência alimentar e positiva com o consumo de ração e o ganho de peso dos animais. Não houve alteração do consumo de ração, do ganho de peso e da eficiência alimentar dos suínos. O ácido linoleico conjugado aumentou em 9% o conteúdo de carne magra na carcaça, e seu consumo variou a espessura média de toucinho. O ácido linoleico conjugado aumenta o conteúdo de carne magra e reduz a espessura de toucinho na carcaça, sem influenciar o desempenho e a qualidade da carne em suínos.This work aimed at meta-analyzing the association of conjugated linoleic acid (CLA with the performance and the carcass and meat quality in pigs (Sus scrofa domesticus. The database used assembled 15 scientific papers, published from 1999 to 2006, comprising 216 diets and 5,223 animals. Meta-analysis was carried out by graphical examination (to observe biological coherency, correlation (to identify correlated variables and variance-covariance analysis of the data. The analysis of variance included only meat and carcass variables with stronger correlation to CLA consumption by the animals, and encodings to inter and intra-experimental effects. The inclusion of CLA in diets

  8. Efecto del ácido linoleico conjugado sobre la proporción de sexos y calidad de embriones bovinos producidos in vitro Effect of conjugated linoleic acid on sex ratio and quality of in vitro produced bovine embryos

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    NA Gómez

    2013-01-01

    Full Text Available El objetivo de este estudio fue evaluar el efecto de la suplementación del medio de cultivo con ácido linoleico conjugado (CLA sobre el clivaje, producción, proporción de sexos y calidad embrionaria en embriones bovinos producidos in vitro al día 7 de cultivo. Se fertilizaron 308 CCO suplementados en cultivo con 100 µM del isómero de CLA Cis-9 Trans-11 y Cis-10-Trans-12 y 257 CCO en el grupo control; la producción de embriones fue 25,32% vs 35,40% respectivamente con diferencia significativa (P The aim of this study was to evaluate the effect of culture medium supplementation with conjugated linoleic acid (CLA on embryo cleavage, embryo production, sex ratio and embry o quality in in vitro produced bovine embryos at day 7 of culture. 308 COCs were used for the group supplemented with 100 µM of the CLA isomer Cis-9 trans-11 and Cis-10-Trans-12 and 257 COCs for the untreated control group; the embryo production was 25.32% vs 35.40%, respectively, with significant difference between them (P < 0.05. The embryos were classified according to the IETS in Mo, Bt, Bl and Bx stages for morphological and molecular analysis. PCR was used for sex determination; embryo quality was assessed as grade 1 (excellent or good and Grade 2 (regular. The results showed no significant difference in the proportion of embryos male:female for any of the stages in the CLA supplemented group achieving the expected natural ratio (50:50, while the control maintained a greater number of males. The CLA improved quality in Bl and Bt stages for both females and males (P < 0.05 having a greater number of grade 1 embryos in supplemented group, while control embryos were more in grade 2. In conclusion, CLA adversely affects the production of bovine embryos in vitro, but the sex ratio equals the natural one in all stages and improves embryo quality in some stages of early development.

  9. CONJUGATED LINOLEIC ACID (CLA CONTENT AND FATTY ACID COMPOSITION OF SOME COMMERCIAL YOGURTS FROM COLOMBIA CONTENIDO DE ÁCIDO LINOLEICO CONJUGADO (CLA Y COMPOSICIÓN DE ÁCIDOS GRASOS EN ALGUNOS YOGURES COMERCIALES DE COLOMBIA

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    Luis Felipe Gutiérrez Álvarez

    2010-12-01

    Full Text Available The concentration of the conjugated linoleic acid (CLA of the fifteen commercial yogurts corresponding to the main consumption and distribution in the Colombian market was studied, as well as their fatty acid composition. The concentration of CLA, expressed as mg of cis-9,trans-11 octadecadienoic acid/g fat and as mg of cis-9,trans-11 octadecadienoic acid/100 g sample varied between 4.5 and 8.2, and between 7.8 and 25.5, respectively. The higher values of CLA (>6.0 mg/g fat corresponded to those samples containing yogurt starter (Lactobacillus delbrueckii ssp. bulgaricus and Streptococcus salivarius ssp. thermophilus and species of Bifidobacterium and Lactobacillus. The main fatty acids found in the studied samples were the acids palmitic (10.7-21.2 mg/g fat, oleic (11.9-21.0 mg/g fat, stearic (16.1-37.4 mg/g fat, myristic (3.5-7.8 mg/g fat and butyric (1.6-5.5 mg/g fat. Low PUFA/SFA and MUFA/SFA ratios were found, as typical of milk fat samples.Se estudió la concentración de ácido linoleico conjugado (CLA de quince yogures de las marcas comerciales de mayor consumo y distribución en el mercado colombiano, así como su composición en ácidos grasos. La concentración de CLA, expresada como mg de ácido cis-9,trans-11 octadecadienoico/g de grasa y como mg de ácido cis-9,trans-11 octadecadienoico/100 g de yogur osciló entre 4,5 y 8,2 y entre 7,8 y 25,5, respectivamente. Los valores de CLA más elevados (>6,0 mg/g de grasa en los yogures evaluados, correspondieron a aquellos que contenían cultivo de yogur (Lactobacillus delbrueckii ssp. bulgaricus y Streptococcus salivarius ssp. thermophilus y especies de Bifidobacterium y Lactobacillus. Los principales ácidos grasos encontrados en las muestras estudiadas, fueron los ácidos palmítico (10,7-21,2 mg/g de grasa, oleico (11,9-21,0 mg/g de grasa, esteárico (16,1-37,4 mg/g de grasa, mirístico (3,5-7,8 mg/g de grasa y butírico (1,6-5,5 mg/g de grasa. Bajas relaciones de PUFA/SFA y de MUFA

  10. Los isómeros cis-9, trans-11 y trans-10, cis-12 de ácido linoleico conjugado y su relación con producción de leche de vacas Holstein-Friesian. Revisión

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    Rufino López Ordaz; José Guadalupe García Muñiz; Amado Islas Espejel; Rodolfo Ramírez Valverde; Agustín Ruíz Flores; Ismael Ponce Candelario; Reyes López Ordaz

    2013-01-01

    Los objetivos de la presente revisión fueron estudiar los mecanismos de la adición de cis-9, trans-11 y trans-10, cis- 12 del ácido linoleico conjugado (ALC) en la dieta y su relación con producción de leche. Ambos isómeros se forman por la isomerización del ALC por la bacteria ruminal Butyrivibrio fribisolvens. También pueden ser producidos por desaturación del ácido vaccénico (18:1, trans-11) en el intestino delgado o el hígado de la vaca lechera. En humanos, el consumo de ambos se relacion...

  11. Los isómeros cis-9, trans-11 y trans-10, cis-12 de ácido linoleico conjugado y su relación con producción de leche de vacas Holstein-Friesian. Revisión

    OpenAIRE

    José Guadalupe García Muñiz; Rufino López Ordaz; Amado Islas Espejel; Rodolfo Ramírez Valverde; Agustín Ruíz Flores; Ismael Ponce Candelario; Reyes López Ordaz

    2013-01-01

    Los objetivos de la presente revisión fueron estudiar los mecanismos de la adición de cis-9, trans-11 y trans-10, cis- 12 del ácido linoleico conjugado (ALC) en la dieta y su relación con producción de leche. Ambos isómeros se forman por la isomerización del ALC por la bacteria ruminal Butyrivibrio fribisolvens. También pueden ser producidos por desaturación del ácido vaccénico (18:1, trans-11) en el intestino delgado o el hígado de la vaca lechera. En humanos, el consumo de ambos se relacion...

  12. Conjugated linoleic acid (CLA: effect modulation of body composition and lipid profile El ácido linoleico conjugado (CLA: los efectos en la modulación de la composición corporal y en el perfil lipídico

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    A. Baddini Feitoza

    2009-08-01

    Full Text Available Conjugated linoleic acid (CLA refers to a family of polyunsaturated fatty acids, being represented by a group of isomers of linoleic acid called conjugated for having a double bound after a simple bound. Among its isomers, trans-10,cis-12 and cis-9, cis-12 CLA stand out. These isomers can lead to different effects on the body: anticarcinogenic, antidiabetogenic, antiatherogenesis and positive body composition alteration. The objective of this review is to describe their mechanisms of action, effects on body composition, on plasmatic lipoproteins and supplementation. Studies about CLA supplementation show its capacity of reducing fat percentage, body mass and of promoting an improvement in lipid metabolism. One of the adverse effects attributed to one of the isomers is insulin resistance by body fat redistribution. Limitations in the scientific models used in CLA researches make impossible to draw conclusions about the action of this fatty acid on human metabolism.El ácido linoleico conjugado (CLA es un ácido graso que pertenece al grupo de los ácidos grasos poliinsaturados, representado por el conjunto de isómeros del ácido linoleico, que son denominados conjugados porque poseen una doble conexión tras una conexión simple. De entre sus isómeros se distinguen el trans-10,cis-12 y cis-9, cis-12 CLA. Estos isómeros son capaces de promover efectos distintos en el organismo: anticarcinogénesis, antidiabetogénesis, antiaterogénesis y cambios de composición corporal. El objetivo de esta revisión es describir sus mecanismos de acción, los efectos en las lipoproteínas plasmáticas, en la composición corporal y la suplementación. Los estudios acerca de la suplementación del CLA demuestran su capacidad de reducir el porcentaje de grasa, el peso corporal, y de mejorar el metabolismo lipídico. Sin embargo, unos de los efectos contrarios relacionados a uno de sus isómeros es la resistencia a la insulina a través de la redistribución de

  13. Los isómeros cis-9, trans-11 y trans-10, cis-12 de ácido linoleico conjugado y su relación con producción de leche de vacas Holstein-Friesian. Revisión

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    Rufino López Ordaz

    2013-01-01

    Full Text Available Los objetivos de la presente revisión fueron estudiar los mecanismos de la adición de cis-9, trans-11 y trans-10, cis- 12 del ácido linoleico conjugado (ALC en la dieta y su relación con producción de leche. Ambos isómeros se forman por la isomerización del ALC por la bacteria ruminal Butyrivibrio fribisolvens. También pueden ser producidos por desaturación del ácido vaccénico (18:1, trans-11 en el intestino delgado o el hígado de la vaca lechera. En humanos, el consumo de ambos se relaciona con funciones antiaterogénicas hipocolesterolemia, estimulantes del sistema inmune, protector contra ciertos tipos de cáncer, antioxidante y reductor del peso corporal. Por el contrario, en la vaca la adición de los isómeros incrementa el volumen de leche y reduce su contenido de grasa. El incremento en volumen se atribuye al cis-9, trans-11; mientras que la reducción de grasa se atribuye al tras-10, cis-12. La partición de la energía reduce el periodo del balance negativo de energía (BNE postparto. Este hecho se asocia con un mejoramiento de la eficiencia reproductiva y la salud de la vaca. La reducción de la grasa de leche por los isómeros o por las dietas que inducen reducción de grasa de leche se explica por la presencia de inhibidores de la síntesis de grasas. En conclusión, la adición de los isómeros a las dietas de vacas lecheras no influye en el consumo de materia seca, los cambios de peso y la producción de proteína. Por el contrario, la inclusión en la dieta de ambos isómeros incrementa el volumen de leche y se reduce su contenido de grasa.

  14. Modificación en la composición de ácidos grasos del huevo al incluir aceite de sardina y ácido linoleico conjugado en dietas para gallinas ponedoras Modulation in egg fatty acids composition when laying hens diets are supplemented with sardine oil and conjugated linoleic acid

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    S Carrillo

    2012-01-01

    Full Text Available Actualmente el consumo regular de ácidos grasos omega 3 (C18:3 ALA, C20:5 EPA, C22:6 DHA y de ácido linoleico conjugado (C18:2 CLA es recomendado debido a la importancia que estos compuestos bioactivos tienen en la prevención y control de enfermedades cardiovasculares, diabetes y diferentes tipos de cáncer. El objetivo de este estudio fue determinar el efecto sobre la composición en ácidos grasos del huevo cuando la dieta de las gallinas es suplementada con aceite de sardina y CLA. 240 gallinas Bovans White fueron distribuidas aleatoriamente en cuatro tratamientos con cinco réplicas de 12 aves cada una. Los tratamientos fueron: testigo (T1 con una dieta basal, la misma que T1 más 2,5% de aceite de sardina (T2, la misma que T2 pero adicionando 1% y 2% de CLA (T3 y T4 respectivamente. El ensayo experimental tuvo una duración de cuatro semanas. Al final de este período, 50 huevos de cada tratamiento fueron tomados para realizar la determinación de ácidos grasos por cromatografía de gases. Con respecto al tratamiento testigo, los resultados mostraron un incremento en la concentración total de ácidos grasos omega 3 (1,6% vs 6,0% del total de ácidos grasos y de CLA (0,7% vs 3-5% del total de ácidos grasos en el huevo de los tratamientos T3, T4 y T5 en conjunto, y una relación n6:n3 de 11:1 vs 1.3:1 (P The regular intake of omega 3 fatty acids (C18:3 ALA, C20:5 EPA, C22:6 DHA and conjugated linoleic acid (C18:2 CLA is currently recommended due to their importance in the prevention and control of cardiovascular diseases, diabetes and several types of cancer. The aim of this study was to determine the effect of supplementing laying hens diets with sardine oil and CLA on egg fatty acid composition. 240 Bovans White hens were randomly distributed into four treatments with 5 replicates of 12 hens each one. The treatments consisted in a control diet (T1, T1 plus 2.5% of sardine oil (T2, and T2 padded with 1% and 2% of CLA (T3 and T4

  15. Desarrollo de bebidas lácteas funcionales con énfasis en ácido linoleico conjugado (CLA)

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    Barón Nuñez, Marby Rocío

    2010-01-01

    Los alimentos funcionales, adicional al efecto nutricional otorgan al consumidor un bienestar en su salud presentando beneficios fisiológicos o aportando protección contra enfermedades (FDA) y se presentan como un sector de gran dinamismo dentro de los cuales el segmento de derivados lácteos, reviste especial interés. El yogur es ampliamente reconocido gracias a los múltiples beneficios que su consumo aporta tanto en el mejoramiento del tránsito intestinal como en la regulación del sistema in...

  16. Haptenos, conjugados y anticuerpos para el fungicida pirimetanil

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    Mercader Badia, Josep Vicent; Abad Fuentes, Antonio; Abad Somovilla, Antonio; Agulló, Consuelo

    2012-01-01

    La presente invención se refiere a haptenos, conjugados, derivados marcados y anticuerpos para pirimetanil. Así mismo, la presente invención también se refiere al uso de conjugados de pirimetanil como antígenos de ensayo o inmunógenos para obtener anticuerpos de este fungicida; y al uso de los derivados marcados de pirimetanil como antígenos de ensayo. Además, la presente invención también se refiere a un método de análisis de pirimetanil utilizando los anticuerpos obtenidos, en ocasiones jun...

  17. Dietas bajas en proteína adicionadas con ácido linoleico conjugado o aceites de soya acidulado para cerdos en engorda

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    Martínez Aispuro, Manuel

    2012-01-01

    Reducir la concentración de proteína en las dietas de cerdos adicionando aminoácidos sintéticos mantiene la respuesta productiva, pero la carne tiene un mayor contenido de grasa. El uso de distinto aceite en la dieta de cerdos puede modificar este aspecto; además, de cambiar el contenido de ácidos grasos en la carne por aumento en el consumo de ácidos grasos que no son sintetizados por los cerdos. Se realizaron tres experimentos para evaluar dietas bajas en proteína y dist...

  18. Haptenos, conjugados y anticuerpos para el fungicida pirimetanil

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    Mercader Badia, Josep Vicent; Abad Fuentes, Antonio; Abad Somovilla, Antonio; Agulló, Consuelo

    2012-01-01

    [ES] La presente invención se refiere a haptenos, conjugados, derivados marcados y anticuerpos para pirimetanil. Así mismo, la presente invención también se refiere al uso de los derivados marcados de pirimetanil como antígenos de ensayo o inmunógenos para obtener anticuerpos de este fungicida; y al uso de los derivados marcados de pirimetanil como antígenos de ensayo. Además, la presente invención también se refiere a un método de análisis de pirimetanil utilizando los anticuerpos obtenidos,...

  19. Importancia do conjugado arteria carotida interna-seio cavernoso

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    Milton Baggio Moreira

    1977-12-01

    Full Text Available O autor considera necessário o conjugado anatômico artério-venoso representado pela artéria carótida interna e seio cavernoso, bem como o plexo venoso carotídeo que reveste a carótida interna dentro do canal carotídeo da porção petrosa do osso temporal. Julga que, além de proteger a parede vascular arterial nas hipertensões arteriais súbitas, possa contribuir no mecanismo de controle e regulação do fluxo sanguíneo carotídeo, por considerar diferentes as condições fisiológicas do seio cavernoso em relação aos demais seios venosos durais e o sistema venoso endocraniano; consequente de sua constituição cavernosa, diferente dos demais canais sanguíneos venosos, com fisiollogia venosa própria e funções diferentes. Procura assemelhá-los aos demais distritos do organismo em que existem plexos cavernosos nos quais a tensão venosa chega a grandes proporções, comparada às demais regiões em que não existe esta constituição morfológica. Estabelece a correlação resultante ao mecanismo de resistência cérebro-vascular do qual considera participar, diferindo dos demais seios durais conjugado artéria carotida-beio cavernoso e veias encefálicas. Ainda valoriza o sifão carotídeo fisiologicamente e julga que o mesmo participa da hemodinâmica quando o paciente se encontra caído (em plano horizontal com hipotensão arterial, favorecendo a chegada sanguínea ao cérebro, evitando a anóxia e descerebração consequente dentro de determinados limites, sendo mais um meio de defesa do organismo.

  20. Evaluacion de un conjugado antirrabico por titulacion en diferentes microscopios fluorescentes

    Directory of Open Access Journals (Sweden)

    O. P. Larghi

    1986-02-01

    Full Text Available En cinco laboratorios se tituló una partida de conjugado antirrábico para inmunofluoresCencia con microscopios de tres marcas distintas, equipados con diferentes accesorios. Los títulos obtenidos variaron entre < 1:4 y 1:64, dependiendo de los accesorios utilizados. Estos resultados ponen de relieve la necesidad de titular los conjugados en cada laboratorio. Se mencionam los inconvenientes que pueden ocasionar la distribución del reactivo diluido de acuerdo con el título obtenido por el productor, o mezclado con suspensiones de cerebro de ratones normales e infectados con virus rábico.

  1. Evaluacion de un conjugado antirrabico por titulacion en diferentes microscopios fluorescentes

    OpenAIRE

    1986-01-01

    En cinco laboratorios se tituló una partida de conjugado antirrábico para inmunofluoresCencia con microscopios de tres marcas distintas, equipados con diferentes accesorios. Los títulos obtenidos variaron entre < 1:4 y 1:64, dependiendo de los accesorios utilizados. Estos resultados ponen de relieve la necesidad de titular los conjugados en cada laboratorio. Se mencionam los inconvenientes que pueden ocasionar la distribución del reactivo diluido de acuerdo con el título obtenido por el produ...

  2. EVALUACIÓN COMPARATIVA DEL EFECTO CRIOPROTECTOR DE LOS ÁCIDOS LINOLEICO Y OLEICO EN OOCITOS DE BOVINO

    OpenAIRE

    MM García-Rodríguez; I Gallegos-Morales; J Vargas-Mancilla; JC Díaz-Zagoya

    2011-01-01

    Se estudió, utilizando microscopía estereoscópica o electrónica, el efecto crioprotector de los ácidos grasos linoleico y oleico en oocitos de bovino, comparativamente con glicerol. La baja temperatura (-196 oC) dañó todos los oocitos en los que se empleó oleico, 25% en los que se utilizó linoleico y 15% cuando se protegió con glicerol. La microscopía estereoscópica no evaluó el daño adecuadamente, en cambio la micrografía electrónica definió con certeza el grado del mismo.

  3. Yogurt funcional alto CLA

    OpenAIRE

    Massa Grilli, Elisa

    2012-01-01

    La presencia de compuestos bioactivos en la grasa láctea ha despertado gran interés ya que se le atribuyen efectos preventivos frente a enfermedades de alto impacto en la población. Se ha demostrado que los sistemas de alimentación basados en pastoreo incrementan la presencia de ácidos grasos poliinsaturados y específicamente del acido linoleico conjugado, obteniéndose un alimento funcional que presenta propiedades beneficiosas sobre la salud. El objetivo del presente ...

  4. Hidrolisis enzimatica del acido pectico con una endopoligalacturonasa de levadura: Cinetica y distribucion de masas moleculares

    National Research Council Canada - National Science Library

    Serrat-Diaz, Manuel; Dume-Arias, Richard A; Del-Todo-Martinez, Yuniesky; Rodriguez-Gamez, Odalys; Almenares-Verdecia, Juan F; Machado-Garcia, Roberto G

    2013-01-01

    .... En este trabajo se presenta la cinetica de la hidrolisis enzimatica del acido pectico con una endopoligalacturonasa de levadura, asi como la caracterizacion de la distribucion de masas moleculares en el hidrolizado...

  5. Evaluacion de las propiedades mecanicas de poliesteramidas derivadas de los acidos tartarico y succinico

    National Research Council Canada - National Science Library

    Perez-Rodriguez, Angel T; Fernandez-Santin, Jose M; Alla, Abdellilah; Munoz-Guerra, Sebastian

    2012-01-01

    ...% de ester, obtenidas a partir de los acidos tartarico y succinico. Las mismas constituyen polimeros que presentan potencial aplicacion en el sector biomedico por su posible utilizacion en intervenciones quirurgicas para hilos de sutura...

  6. Concentraciones de acido urico e hiperuricemia en pacientes con hipertension arterial sistemica

    National Research Council Canada - National Science Library

    Lopez-Rosado, Ivonne; Luz-Araujo, Hedy; Guerra-Velasquez, Mery; Reyna-Villasmil, Eduardo; Mejia Montilla, Jorly; Reyna-Villasmil, Nadia; Torres-Cepeda, Duly

    2009-01-01

    El objetivo de la investigacion fue relacionar las concentraciones de acido urico y la presencia de hiperuricemia con la presion arterial en pacientes con diagnostico de hipertension arterial sistemica...

  7. Efeito dos Estrógenos Conjugados e da Medroxiprogesterona sobre a Mama: Estudo Experimental

    Directory of Open Access Journals (Sweden)

    Santos Luciana de Oliveira Marques dos

    2001-01-01

    Full Text Available Objetivo: avaliar no tecido mamário a influência de drogas empregadas na terapia de reposição hormonal sobre a proliferação celular, a quantidade de colágeno e de fibras elásticas e as alterações histológicas gerais do parênquima. Método: utilizaram-se 61 ratas Wistar-UFPR, adultas, divididas em 5 grupos. O grupo padrão (n=12 representou o perfil hormonal ovariano normal. As 49 ratas restantes foram ooforectomizadas e a partir do 96º dia P.O. receberam a medicação designada para cada grupo durante 30 dias. O grupo EEC (n=13 recebeu 50 mg/dia de estrógenos eqüinos conjugados; o grupo MPA (n=12, 2,0 mg/dia de acetato de medroxiprogesterona; o grupo EEC + MPA (n=12, ambos, e o grupo AD (n=12, água destilada. No 31º dia de medicação todos os animais foram sacrificados e as mamas inguinais foram retiradas para análise histológica. A avaliação da proliferação celular nos ductos e ácinos foi realizada por método imuno-histoquímico utilizando-se anticorpo anti-PCNA. Utilizando-se a coloração de Sirius-Red quantificou-se o colágeno maduro (tipo I e imaturo (tipo III. A coloração de Weigert avaliou a formação de fibras elásticas. A análise anatomopatológica foi realizada em coloração de hematoxilina-eosina, determinando-se o número de ácinos por ducto terminal, número de ductos por campo, presença de secreção intraductal e a intensidade de vacuolização intracitoplasmática. Resultados: o grupo EEC + MPA apresentou menor porcentagem de células ductais em proliferação (46,1% (p<0,0001. Também mostrou maior taxa de proliferação das células acinares (66,3%, sendo semelhante ao grupo MPA (p=0,075 mas diferente dos demais grupos (p<0,004. No grupo EEC encontrou-se maior quantidade de colágeno imaturo (33,6% (p<0,01 e o grupo MPA apresentou mais elevada concentração de fibras elásticas (11,7% (p<0,0001. Os grupos EEC + MPA e MPA apresentaram hiperplasia acinar secretora, sendo intensa (91,7% no grupo

  8. Inmunogenicidad de conjugados de polisacárido de Neisseria meningitidis serogrupo C unido al toxoide tetánico por diferentes brazos espaciadores

    Directory of Open Access Journals (Sweden)

    Osmir Cabrera

    2005-01-01

    Full Text Available El desarrollo de las vacunas conjugadas compuestas por polisacáridos unidos covalentemente a proteínas contra Haemophilus influenzae type b, han demostrado ser eficaces en infantes, lo que condujo al desarrollo activo de las vacunas conjugadas contra otros microorganismos por varios grupos de investigaci ón. La influencia en la respuesta inmune de la estructura de los brazos espaciadores utilizados en conjugados de polisacárido de N. meningitidis serogrupo C (PMGC-toxoide tetánico (TT fue evaluado en ratones Balb/c. Se determin ó la generación de anticuerpos IgG anti-PMGC e IgG anti-TT en los sueros de los animales inoculados por medio de un ELISA indirecto. También se evaluaron las subclases de anticuerpos IgG1 e IgG2a anti PMGC. El 1,6-diaminohexano (AH, el 1,8-diaminooctano (AO, el ácido 6-aminohexanoico (AA y la dihidrazida del ácido adípico (ADH, fueron utilizados como brazos espaciadores con diferentes estructuras químicas, unidos al PMGC y al TT por medio de la reacción con carbodiimida. El suero de todos los ratones que fueron inoculados con los conjugados presentaron elevados títulos de IgG anti-PMGC y los valores más elevados se encontraron en los sueros de animales inoculados con el conjugado en los que se utilizó al ADH como brazo espaciador. En los grupos de animales inmunizados con los conjugados que utilizaron al AO y al ADH se detectaron títulos de IgG2a superiores a los detectados para el PMGC no conjugado; se observaron los títulos de IgG2a más elevados en los sueros de ratones inmunizados con conjugados con ADH. Las concentraciones de anticuerpos IgG anti-TT observados en los sueros de los ratones inmunizados con los conjugados fueron más elevados que los determinados en el suero de animales inmunizados con el TT. Se concluyó que la respuesta inmune obtenida en los ratones después de ser inoculados con los conjugados varía en dependencia del brazo del espaciador utilizado, siendo más elevada cuando se

  9. Sobre el principio de Symploké en El Sofista de Platón y los conceptos conjugados de reposo y movimiento

    OpenAIRE

    Armesilla Conde, Santiago Javier

    2013-01-01

    Se analiza la importancia de las ideas filosóficas de reposo y movimiento en El Sofista de Platón y su relación en el campo gnoseológico de la ciencia Física como conceptos conjugados en el materialismo filosófico de Gustavo Bueno.

  10. Síntesis y actividad citotóxica de conjugados de la uridina con triterpenos en células de cáncer de mama

    Directory of Open Access Journals (Sweden)

    Jhon Fernando Berrío Escobar

    Full Text Available Objetivos: Sintetizar conjugados del acetónido de la uridina con triterpenos (colesterol y 3β-5α,8α-endoperoxido-colest-6-en-3-ol y ácido succínico como puente. Métodos: Se preparó el acetónido de la uridina en acetona mediante catálisis ácida. Se prepararon los succinatos de los esteroles con anhídrido succínico y catalizador nucleofílico 4-N,N-dimetilamino-piridina (DMAP. Los conjugados 1 y 2 se sintetizaron mediante la esterificación de Steglich, con agente de acoplamiento N,N'-diciclohexilcarbodiimida (DCCy DMAP. Los compuestos se caracterizaron por espectroscopia de RMN (¹H RMN y 13C RMN y espectrometría de masas. Los derivados se evaluaron sobre líneas celulares de ovario de hámster chino (CHO-K1 y de cáncer de mamá (MCF-7. Resultados: Se obtuvieron derivados conjugados del acetónido de la uridina con dos triterpenos con rendimientos superiores al 80%. Los conjugados de uridina con triterpenos no presentaron inhibición significativa de la viabilidad celular sobre las líneas celulares MCF-7 y CHO-K1, tampoco se evidenció una relación dosis-respuesta para los compuestos evaluados. Conclusiones: El método de esterificación con agentes de acoplamiento permitió obtener conjugados de la uridina con triterpenos empleando el ácido succínico como puente. Sin embargo los derivados de uridina obtenidos no presentaron actividad citotóxica significativa (p<0,05 sobre las líneas celulares evaluadas.

  11. Calcio-ácido linoleico en la prevención de la preeclampsia y la hipertension arterial inducida por el embarazo.

    Directory of Open Access Journals (Sweden)

    Julián A. Herrera M

    2009-10-01

    Full Text Available En 12 centros de salud de Cali, se hizo un ensayo clínico controlado, al azar, que incluyó 91 gestantes primigrávidas, normotensas, con alto riesgo biopsicosocial, una prueba de presión arterial supina positiva y una presión arterial media alta. Las futuras madres se asignaron a 3 grupos: 43 (47.2% al grupo de intervención (Grupo A: calcio elemental, 600 mg, ácido linoleico, 450 mg; y 48 (52.7% a 2 grupos controles [Grupo B: 24 (26.3%, con intervención psicosocial y placebo; Grupo C: otras 24 (26.3% que recibieron doble placebo.] Para comenzar el estudio se hizo una evaluación obstétrica y nutricional, con evaluación prospectiva del resultado perinatal. La edad promedio fue 21.1±4.9 años; no hubo diferencias estadísticas en las variables sociodemográficas. Del total, 20 (21.9% pacientes desarrollaron HIEP; en el Grupo A, 4 (9.3% [RR = 0.22 (i.c. 95% 0.08 - 0.64, p = 0.001]; en el Grupo control B, 4 (16.7%; y en el Grupo control C, 12 (50.0%. El calcio elemental y el ácido linoleico en dosis bajas, durante el tercer trimestre del embarazo, disminuyeron significativamente la incidencia de preeclampsia en pacientes con alto riesgo de desarrollarla.

  12. Producción del primer lote de conjugado antirrábico de origen caprino en el Perú

    Directory of Open Access Journals (Sweden)

    Ricardo Lopez I

    1997-01-01

    Full Text Available El objetivo del presente trabajo fue la producción y evaluación del primer lote de conjugado antirrábico de origen caprino producido en el Perú. La globulina antirrábica conjugada con fluoresceína fue preparada en el Laboratorio de Referencia de Rabia y la vacuna utilizada para la inmunización de los animales fue producida en el Laboratorio de Rabia del Centro Nacional de Producción de Biológicos del Instituto Nacional de Salud (Lima, Perú. Para la inmunización se utilizó una vacuna hecha a base de cultivo de células VERO con los adyuvantes de Freundt completo e incompleto. La vacunación se hizo semanalmente por cuatro semanas con descarga de virus vivo a la quinta y dos revacunaciones más posteriormente. El conjugado producido en el laboratorio obtuvo una intensidad (4+ en tinción especifica, (3+ en calidad de inclusiones y (1+ de fluorescencia no especifica. Sin embargo, el conjugado comercial obtuvo una intensidad más baja (3+ en tinción específica, mayor cantidad de inclusiones (4+ y menos tinción inespecífica (0+.

  13. Caracterización de conjugados inmunogénicos de polisacárido capsular Streptococcus pneumoniae serotipo 14

    Directory of Open Access Journals (Sweden)

    Janoi Chang

    2013-04-01

    Full Text Available Las vacunas conjugadas que consisten en polisacáridos bacterianos unidos a través de un enlace covalente a una proteína portadora, han tenido un gran impacto en los esquemas de vacunación infantil, disminuyendo de forma dramática la incidencia de infecciones bacterianas. En el caso de Streptococcus pneumoniae, a pesar de que se han descrito más de 90 serotipos basados en la estructura de las cápsulas polisacarídicas y que al menos 23 tienen una importancia clínica demostrada, solo un número limitado de siete, o más recientemente 10 y 13, están incluidos en las vacunas conjugadas licenciadas. Por otra parte, la necesidad creciente de estas vacunas en el mundo requiere la incorporación de nuevos productores que se enfrentan a una elevada complejidad tecnológica, pues en todo el procedimiento de conjugación no se pueden afectar las características estructurales por las que el polisacárido es reconocido inmunológicamente. Este trabajo implementó un procedimiento de conjugación para el polisacárido de la cápsula de Streptococcus pneumoniae serotipo 14. El procedimiento comprendió la fragmentación, oxidación peryódica y posterior conjugación del polisacárido a anatoxina tetánica o diftérica. Cada intermedio fue caracterizado por métodos físico-químicos. En todas las reacciones se obtuvieron rendimientos superiores al 50%. Los conjugados generaron altos títulos de anticuerpos específicos de tipo IgG y memoria inmunológica. Se concluyó que el procedimiento permitió la obtención de conjugados inmunogénicos de serotipo 14.

  14. Caracterización de la producción bovina lechera en la IX y X Región (Chile). Desarrollo estratégico de la producción láctea con alto contenido en ácido linoleico conjugado (CLA)

    OpenAIRE

    Avilez, Juan Pablo

    2012-01-01

    ANTECEDENTES. La leche de vaca se produce bajo diferentes sistemas de producción en Chile. Por un lado en la zona norte los sistemas son del tipo intensivo, en la zona centro sur las lecherías se ubican en el valle regado y en la zona sur, donde se concentra el mayor porcentaje de lecherías del país, los sistemas productivos están basados en el pastoreo. La producción de leche es considerada un rubro económico importante para estas regiones, el cual proporciona mano de obra ...

  15. Paralisia do olhar conjugado lateral associada a oftalmoplegia internuclear unilateral em hemorragia mesencéfalo-pontina alta: relato de um caso

    Directory of Open Access Journals (Sweden)

    Juliano L. Fontanari

    1986-12-01

    Full Text Available Os autores relataram um caso de hemorragia mesencéfalo-pontina alta direita, com oftalmoplegia extrínseca, permanecendo apenas a convergência bilateral, a abdução voluntária e automático-reflexa do olho esquerdo, e a adução deste olho na pesquisa dos reflexos vestíbulo-oculares ("one-and-a-half syndrome". Ainda, havia dissociação voluntária-automática da motricidade das pálpebras e dos movimentos conjugados verticais e, também, hemiplegia sensitivo-motora à esquerda e asterixis.

  16. Some Biochemical Properties of an Acido-Thermophilic Archae-Bacterium Sulfolobus Acidocaldarius

    Science.gov (United States)

    Oshima, Tairo; Ohba, Masayuki; Wagaki, Takayoshi

    1984-12-01

    To elucidate the phylogenic status of archaebacteria, some basic cellular components of an acido-thermophilic archaebacterium,Sulfolobus acidocaldarius, were studied. Poly(A) containing RNA was present in the cells, and performed the role of mRNA in a cell-free extract of reticulocyte or the archaebacteria. Poly(A) containing RNA was also found in other archaebacterial cells. The absence of cap structure was suggested in these RNAs. The cell-free protein synthesis using the archaebacterial extract was inhibited by anisomycin, a specific inhibitor for eukaryotic ribosomes. Two unique membrane-bound ATPases were detected. Based on resistance to H+-ATPase inhibitors, these enzymes seemed not to be F0F1-ATPase.

  17. Trastornos acido base en una unidad de cuidados intensivos pediátrica de Bogotá

    OpenAIRE

    Vásquez Hoyos, Pablo

    2012-01-01

    Objetivo: Describir la frecuencia de presentación de los trastornos acido base en una unidad de cuidado intensivo pediátrico de la ciudad de Bogotá utilizando 3 métodos de análisis ampliamente reconocidos. Población: Pacientes pediátricos hospitalizados entre febrero y abril de 2001, por más de 24 horas en la unidad de cuidado intensivo del hospital entre el periodo a estudio. Método: Se recoge de manera sistemática prospectiva todo paciente que ingresa a la unidad, se hacen laboratorios de i...

  18. STABILIREA PROPRIETĂŢILOR ACIDO-BAZICE ALE CĂRBUNILOR ACTIVI

    Directory of Open Access Journals (Sweden)

    Raisa NASTAS

    2017-03-01

    Full Text Available Au fost precizate unele aspecte metodologice ale tehnicilor de titrare vizuală (metoda Boehm şi electrometrică (titrări alcalimetrice şi acidimetrice pentru stabilirea proprietăţilor acido-bazice ale adsorbanţilor carbonici. Pe suprafaţa cărbunilor activi obţinuţi prin metoda fizico-chimică predomină grupările funcţionale bazice, pentru determinarea conţi­nutului lor fiind recomandată metoda titrării conductometrice acidimetrice. De rând cu grupările bazice, pe suprafaţa acestor cărbuni există şi grupări funcţionale acide, pentru determinarea lor fiind recomandată metoda titrării pH-metrice indirecte. Pe suprafaţa cărbunilor activi obţinuţi prin metoda chimică predomină grupările funcţionale acide, pentru de­ter­­minarea conţinutului lor fiind recomandă metoda titrării conductometrice alcalimetrice. Pentru determinarea grupări­lor bazice pe suprafaţa acestor cărbuni se recomandă metoda titrării pH-metrice indirecte.EVALUATION OF ACTIVE CARBONS ACID-BASIC PROPERTIESThe methodological peculiarities of visual titration method (Boehm method and electrometric (alkalimetric and acidimetric titrations for researching of acid-basic properties of carbonaceous adsorbents have been specified. On the surface of active carbons obtained by physical-chemical method of activation the basic sites predominate being recom­mended acidimetric conductometric titration for their determination. Besides of such groups there are also acidic sites being recommended alkalimetric pH-metric back titration for their determination. On the surface of active carbons obtained by chemical activation the acidic groups predominate being recommended alkalimetric conductometric titration for their determination. Besides of such groups there are also basic sites being recommended acidimetric pH-metric back titration for their determination.

  19. Gêmeos conjugados: experiência de um hospital terciário do sudeste do Brasil Conjoined twins: an experience of a tertiary hospital in Southeast Brazil

    Directory of Open Access Journals (Sweden)

    Aderson Tadeu Berezowski

    2010-02-01

    Full Text Available OBJETIVO: analisar a ocorrência de gemelaridade conjugada em um hospital universitário de referência terciária em perinatologia durante 25 anos (janeiro de 1982 e janeiro de 2007 e descrever a separação bem sucedida de um dos pares. MÉTODOS: para este fim, utilizamos retrospectivamente o banco de dados do Hospital das Clínicas da Faculdade de Medicina de Ribeirão Preto da Universidade de São Paulo, obtendo o número de pares de gêmeos conjugados, sua frequência, classificação, gênero, forma de resolução da gravidez, tentativa de separação cirúrgica, diagnóstico pré-natal e sobrevida. RESULTADOS: detectamos 14 pares de gêmeos conjugados (1/22.284 nascidos vivos e 1/90 pares de gêmeos nascidos vivos nascidos neste período (seis masculinos, sete femininos e um com sexo indeterminado. O diagnóstico pré-natal foi realizado em todos os gêmeos, e os nascimentos ocorreram por cesariana. A separação só foi possível em um dos pares, que sobrevivem em ótimas condições de saúde após oito anos. Dos 13 restantes, dez morreram no mesmo dia do nascimento e três sobreviveram apenas alguns meses (menos de um ano. CONCLUSÃO: apesar de este estudo evidenciar um número anormalmente alto de gêmeos conjugados, trata-se de um fenômeno raro, de prognóstico perinatal reservado e dependente do compartilhamento de órgãos entre os gêmeos e malformações associadas, em especial relacionadas ao coração dos fetos. Devido ao mau prognóstico dos pares e do comprometimento reprodutivo materno pela necessidade de realização de cesariana com grandes incisões uterinas, propomos que, com base nestes números, seja solicitada a interrupção precoce destas gestações, como ocorre com outras doenças fetais incompatíveis com a sobrevida extrauterina. Desta forma, a confirmação diagnóstica e a resolução da gravidez de gêmeos conjugados deve ser realizada em centro de atendimento terciário tanto obstétrico quanto perinatal, e

  20. Evaluation of the "spasticity of conjugate gaze phenomenon" in unilateral cerebral lesions Avaliação do "fenômeno do desvio conjugado espástico ocular" em lesões cerebrais unilaterais

    Directory of Open Access Journals (Sweden)

    Eliana Teixeira Maranhão

    2007-06-01

    Full Text Available The spasticity of conjugate gaze phenomenon (SCG is a subtle motor ocular sign that usually indicates unilateral acute cerebral lesion. We analyzed the sensitivity of this sign in a prospective blinded study using 57 patients. All patients had monohemispheric brain lesions without resting deviation of the eyes and no motor complaints. Fourteen individuals without cerebral lesions were included as controls. Patients and controls were submitted to a brain magnetic resonance image. We observed SCG in just 1/57 (sensitivity of 1.7%, while all controls had a normal Bell's phenomenon. We speculate that SCG may disappear over time and is not useful to diagnose a long-lasting unilateral brain lesion.O fenômeno do "desvio conjugado espástico ocular" é um sinal motor ocular sutil que habitualmente indica lesões cerebrais mono-hemisféricas agudas. Avaliamos a sensibilidade deste sinal num estudo prospectivo cego em 57 pacientes. Todos os pacientes apresentavam lesões cerebrais mono-hemisféricas, ausência de queixas motoras ou de desvio conjugado dos olhos em repouso. Quatorze indivíduos sem lesão cerebral foram incluídos como controle. Pacientes e indivíduos controle foram submetidos a exame de ressonância magnética do crânio. Observamos o sinal do desvio conjugado espástico ocular em somente 1/57 pacientes (sensibilidade 1,7%, enquanto todos os controles apresentaram o fenômeno de Bell. Especulamos que este sinal desaparece com o tempo, e que o mesmo não é útil para o diagnóstico de pacientes com lesões cerebrais monohemisféricas de longa duração.

  1. Bases espectroscópicas de la relación estructura-carácter birradical-propiedad en sistemas proaromáticos pi-conjugados derivados de p-QDM

    OpenAIRE

    Zafra, José L.; Casado Cordón, Juan; López Navarrete, Juan Teodomiro

    2014-01-01

    En esta comunicación se estudia, mediante diversos tipos de espectroscopias y haciendo hincapié en la espectroscopia Raman, el efecto que modificaciones estructurales como el aumento de la longitud de la cadena o la planarización del esqueleto pi-conjugado, tienen sobre la expresión del carácter birradical en el estado fundamental de nuevos derivados de p-QDM. Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech.

  2. Respiration gating and Bloch fitting improve pH measurements with acidoCEST MRI in an ovarian orthotopic tumor model

    Science.gov (United States)

    Jones, Kyle M.; Randtke, Edward A.; Howison, Christine M.; Pagel, Mark D.

    2016-03-01

    We have developed a MRI method that can measure extracellular pH in tumor tissues, known as acidoCEST MRI. This method relies on the detection of Chemical Exchange Saturation Transfer (CEST) of iopamidol, an FDA-approved CT contrast agent that has two CEST signals. A log10 ratio of the two CEST signals is linearly correlated with pH, but independent of agent concentration, endogenous T1 relaxation time, and B1 inhomogeneity. Therefore, detecting both CEST effects of iopamidol during in vivo studies can be used to accurately measure the extracellular pH in tumor tissues. Past in vivo studies using acidoCEST MRI have suffered from respiration artifacts in orthotopic and lung tumor models that have corrupted pH measurements. In addition, the non-linear fitting method used to analyze results is unreliable as it is subject to over-fitting especially with noisy CEST spectra. To improve the technique, we have recently developed a respiration gated CEST MRI pulse sequence that has greatly reduced motion artifacts, and we have included both a prescan and post scan to remove endogenous CEST effects. In addition, we fit the results by parameterizing the contrast of the exogenous agent with respect to pH via the Bloch equations modified for chemical exchange, which is less subject to over-fitting than the non-linear method. These advances in the acidoCEST MRI technique and analysis methods have made pH measurements more reliable, especially in areas of the body subject to respiratory motion.

  3. Efecto de los estrógenos equinos conjugados sobre el envejecimiento de la piel de la cara en mujeres posmenopáusicas

    Directory of Open Access Journals (Sweden)

    Luis Alfonso Correa

    2008-02-01

    Full Text Available

     

    OBJETIVOS: verificar si la aplicación tópica de 1 gramo diario de estrógenos equinos conjugados, durante 6 meses, en la piel de la cara, mejora las características clínicas e histopatológicas en mujeres posmenopáusicas entre 45 y 65 años de edad y a la vez, su satisfacción estética personal.

    MÉTODOS: se efectuó un ensayo clínico de intervención, controlado con la misma paciente (antes y después, de la aplicación en la cara de 1 gramo diario de estrógenos equinos conjugados, durante un período de seis meses. Se estudiaron 16 pacientes que cumplieron con los criterios de inclusión y a quienes se les tomaron biopsias antes y después del empleo del medicamento, en las que se evaluaron el grosor epidérmico y dérmico y el grado de elastosis solar. Además se les hizo una encuesta de satisfacción antes y después del estudio.

    RESULTADOS: de las 16 pacientes evaluadas, 15 tenían en las biopsias previas elastosis de grado I y en solo una era de grado II. Los resultados de las biopsias posteriores al tratamiento no evidenciaron ningún cambio en el estadiaje final; sin embargo, se observaron mejoría en el grosor y mayor apetencia tintorial de las fibras de colágeno, sin cambios en la ectasia vascular. La escala de satisfacción global estética de las pacientes

  4. Acido-basic control of the thermoelectric properties of poly(3,4-ethylenedioxythiophene)tosylate (PEDOT-Tos) thin films

    DEFF Research Database (Denmark)

    Khan, Zia Ullah; Bubnova, Olga; Jafari, Mohammad Javad

    2015-01-01

    study the variation in the thermoelectric properties by a simple acido-basic treatment. The emphasis of this study is to elucidate the chemical changes induced by acid (HCl) or base (NaOH) treatment in PEDOT-Tos thin films using various spectroscopic and structural techniques. We could identify changes...... in the nanoscale morphology due to anion exchange between tosylate and Cl- or OH-. But, we identified that changing the pH leads to a tuning of the oxidation level of the polymer, which can explain the changes in thermoelectric properties. Hence, a simple acid-base treatment allows finding the optimum...

  5. Compensación Electrónica de la Dispersión en Fibras Ópticas Usando el Conjugado de Fase Óptica Compensación Electrónica de la Dispersión en Fibras Ópticas Usando el Conjugado de Fase Óptica

    Directory of Open Access Journals (Sweden)

    Juan Manuel López-Hernández

    2012-02-01

    Full Text Available The topic of this work will deal with the investigation of a novel electronic dispersion compensation technique in long-haul fiber optic communications, in which a signal is electricalpre-compensated using a differential Mach-Zender modulator, driven by nonlinear digital filters. The chromatic dispersion was effectively compensated for by using an optical phase conjugation in the transmitter, through 4000 Km of standard single mode fiber (with non onlinearity and attenuation, where the dispersion is compensated for a 10 Gb/s intensity modulated NRZ (non-return to zero signal. The dispersion compensation was confirmed by measuring bit error rate and observing detected eye diagrams.El tópico de este artículo, abordará la investigación de una técnica novedosa para la compensación electrónica de la dispersión en comunicaciones por fibra óptica a larga distancia, en la cual una señal es pre-compensada eléctricamente usando un modulador diferencial Mach-Zender, controlado por filtros digitales no lineales. La dispersión cromática fue efectivamente compensada con el uso del conjugado de fase óptica en el transmisor a través de los 4000 Km de fibra mono modo (carente de no-linealidad y atenuación en donde la dispersión es compensada para una señal de NRZ (no retorno a cero de intensidad modulada a 10 Gb/s. La compensación de la dispersión fue confirmada midiendo la razón de error de bit y observando los diagramas de ojo detectados.

  6. Peracetic acid as disinfectant of municipal wastewaters; L'acido peracetico nella disinfezione dei reflui urbani

    Energy Technology Data Exchange (ETDEWEB)

    Funari, E. [Istituto Superiore di Sanita' , Laboratorio di Igiene Ambientale, Reparto di Medicina Ambientale, Rome (Italy); Lopez, A. [Consiglio Nazionale delle Ricerche, Istituto di Ricerca sulle Acque, Reparto di Chimica e Tecnologia delle Acque, Bari (Italy)

    2000-09-01

    Based on the currently available literature, this paper is aimed at providing a sort of the <> on the use of peracetic acid (C{sub 3}COOOH{identical_to} Paa) as disinfectant of biologically treated municipal wastewater: the growing interest for this substance, used since many years in other sectors (e.g., food-industry, breweries, etc.) is mainly due to the claimed limited formation, if any, of harmful disinfecting by-products (Dbp) with consequent lack of toxicity in Paa treated wastewaters. Such features are just the opposite of those of chlorine, i.e. the most used disinfectant for municipal wastewater. During chlorine-disinfecting, in fact, numerous harmful organo-chlorinated Dbp are formed and, accordingly, the toxicity of chlorinated effluents results very high. In spite of the above reported <> properties of Paa, its use at large scale facilities is still restricted and this not only because of its costs but even for the limited knowledge concerning: the actual disinfecting effectiveness towards different pathogens, the nature and the toxicological properties of its potential Dbp, and the disinfecting performances at large scale facilities. The present paper, besides reporting an extensive and useful collection of references concerning Paa, provides a critical review on the current knowledge regarding specific Paa features such as: its disinfecting effectiveness towards different pathogenic micro-organisms, the nature and the toxicity of its disinfecting by-products, the environmental impact of Paa treated effluents, and the operative conditions used at large scale wastewater treatment plants. [Italian] Il presente lavoro, basandosi sui dati disponibili in letteratura, si propone di fare il punto sull'impiego dell'acido peracetico (CH{sub 3}COOOH{identical_to} PAA) come disinfettante di reflui urbani depurati. Il crescente interesse nei confronti di questa sostenza, gia' nota come disinfettante in

  7. A suplementação com ácido linoléico conjugado reduziu a gordura corporal em ratos Wistar Conjugated linoleic acid suplementation decreased the body fat in Wistar rats

    Directory of Open Access Journals (Sweden)

    Adriana Prais Botelho

    2005-08-01

    Full Text Available O ácido linoléico conjugado, um conjunto de isômeros geométricos e de posição do ácido linoléico, vem sendo muito estudado devido ao seu efeito sobre a composição corporal, promovendo redução da massa gorda. O objetivo deste trabalho foi avaliar o efeito da suplementação com ácido linoléico conjugado sobre a composição corporal de ratos Wistar saudáveis em crescimento. Um total de 40 ratos, divididos em quatro grupos, foram suplementados diariamente durante três semanas com AdvantEdge® ácido linoléico conjugado (EAS TM nas concentrações 1,0%, 2,0% e 4,0% sobre o consumo diário de dieta, constituindo, respectivamente, os grupos AE1, AE2 e AE4, e com ácido linoléico na concentração de 2% sobre o consumo diário de dieta, constituindo o grupo-controle. Os animais foram suplementados por meio de entubação orogástrica. Para a avaliação da composição corporal centesimal foi removido o conteúdo intestinal para obtenção da carcaça vazia. Em seguida, a carcaça foi congelada em nitrogênio líquido, fatiada, liofilizada, moída e armazenada a -25°C, até o momento das determinações de umidade, cinzas, proteína bruta e gordura. O grupo AE1 apresentou maior consumo de dieta e ganho de peso, mas não diferiu quanto à eficiência alimentar dos demais grupos (pConjugated linoleic acid, a group of positional and geometric isomers of linoleic acid, has been greatly investigated due to its effect on body composition, mainly the reduction of body fat. The purpose of this study was to evaluate the effect of conjugated linoleic acid supplementation on the body composition of healthy, growing Wistar rats. Forty male Wistar rats were divided into 4 groups and supplemented daily for 3 weeks with AdvantEdge® conjugated linoleic acid (EAS TM at concentrations of 1.0%, 2.0% and 4.0% of the daily feed intake, corresponding to groups AE1, AE2 and AE4, and with linoleic acid at 2.0% (control corresponding to group C. The

  8. Efeitos do tamoxifeno e dos estrogênios conjugados no epitélio mamário de ratas em estro permanente Effects of tamoxifen and conjugated estrogens on the mammary epithelium of rats in persistent estrus

    Directory of Open Access Journals (Sweden)

    Benedito Borges da Silva

    2000-02-01

    Full Text Available Objetivo: avaliar as alterações morfológicas e morfométricas produzidas pelo tamoxifeno e pelos estrogênios conjugados no epitélio mamário de ratas em estro permanente. Métodos: foram utilizadas 33 ratas adultas, induzidas a estro permanente com 1,25 mg de propionato de testosterona e divididas ao acaso em três grupos: GI -- que receberam apenas água, servindo como controle (n = 12; GII -- tratadas com 500 mig de tamoxifeno diariamente (n = 10; GIII -- tratadas com 30 mig de estrogênios conjugados ao dia (n = 11. O primeiro par mamário abdômino-inguinal dos animais foi extirpado e processado para estudo morfológico e morfométrico. Os dados foram analisados estatisticamente pela análise de variância por postos de Kruskal-Wallis (p Purpose: to evaluate the morphologic and morphometric alterations produced by tamoxifen and conjugated estrogens in the mammary epithelium of rats in persistent estrus. Methods: thirty-three adult female rats in persistent estrus induced with 1.25 mg testosterone propionate were divided at random into three groups: GI -- which received only water, control group (n = 12; GII -- treated with 500 mug tamoxifen daily (n = 10; GIII -- treated with 30 mug conjugated estrogens per day (n = 11. The first inguinal-abdominal pair of mammary glands of the animals was extirpated and processed for morphologic and morphometric study. Data were analyzed statistically by the Kruskal-Wallis rank analysis of variance (p < 0.05. Results: the morphologic study revealed signs of epithelial atrophy and the morphometric study showed a statistically significant reduction in the mean number of ducts and alveoli in groups II (10.1 and 1.9, respectively and III (11.1 and 3.5, respectively compared to group I (25.0 and 6.6, respectively. There was no significant difference between groups II and III. Conclusions: the results of this study indicate that tamoxifen as well as conjugated estrogens at the tested doses produced mammary

  9. Triploidia fetal associada à diminuição da subunidade beta e do estriol não-conjugado no soro materno Fetal triploidy associated with low levels of unconjugated estriol and beta-subunit in maternal serum

    Directory of Open Access Journals (Sweden)

    Eduardo Vieira Neto

    1999-05-01

    Full Text Available Relatamos um caso de triploidia fetal não-molar detectada na 20ª semana gestacional por cordocentese realizada em razão de estudo ultra-sonográfico que revelou retardo do crescimento intra-uterino e grave oligoidrâmnio. Na 19ª semana foram verificados acentuada diminuição da subunidade beta livre da gonadotrofina coriônica humana e do estriol não-conjugado e níveis de alfa-fetoproteína normais, apontando para um risco aumentado de síndrome de Edwards. Houve morte fetal um dia após a cordocentese e a resolução do caso foi por parto vaginal induzido com misoprostol e ocitocina, sob analgesia peridural. Estudo cromossômico das células sangüíneas fetais revelou o cariótipo 69,XXX. O grave retardo do crescimento intra-uterino, a macrocefalia, constatada no estudo anatomopatológico do feto, e os níveis muito baixos de hCG e de estriol não-conjugado sugerem um caso de triploidia por diginia, fertilização de um óvulo diplóide por um espermatozóide haplóide.We report a case of nonmolar fetal triploidy detected by fetal blood sampling at 20 weeks of gestation, performed as an investigation of intrauterine growth retardation and severe oligohydramnios found by ultrasound scan. At 19 weeks of gestation very low levels of maternal free serum beta-subunit of human chorionic gonadotropin and unconjugated estriol, and normal levels of alpha-fetoprotein were found, which were interpreted as a high risk of fetal Edwards syndrome. Fetal death supervened the day after fetal blood sampling, and the pregnancy was terminated by vaginal delivery induced by misoprostol and oxytocin, under epidural anesthesia. Chromosome study of the fetal blood cells showed a 69,XXX karyotype. The severe intrauterine growth retardation and macrocephaly noted on pathological review plus the very low levels of hCG and unconjugated estriol suggest a fetal gynoid triploidy case, caused by the fertilization of a diploid egg by a haploid sperm.

  10. Chemical and physiological aspects of isomers of conjugated fatty acids Aspectos químicos e fisiológicos de isômeros conjugados de ácidos graxos

    Directory of Open Access Journals (Sweden)

    Eliane Bonifácio Teixeira de Carvalho

    2010-06-01

    Full Text Available Conjugated fatty acid (CFA is the general term to describe the positional and geometric isomers of polyunsaturated fatty acids with conjugated double bonds. The CFAs of linoleic acid (CLAs are found naturally in foods derived from ruminant animals, meat, or dairy products. The CFAs of α-linolenic acid (CLNAs are found exclusively in various types of seed oils of plants. There are many investigations to assess the effects to health from CFAs consumption, which have been associated with physiological processes that are involved with non transmissible chronic diseases such as cancer, atherosclerosis, inflammation, and obesity. Conclusive studies about the CFAs effects in the body are still scarce and further research about their participation in physiological processes are necessary. This review aimed to discuss the influence of conjugated fatty acids on physiological processes in animal organism.Ácido graxo conjugado (AGC é o termo geral usado para descrever os isômeros posicionais e geométricos dos ácidos graxos poliinsaturados com duplas ligações conjugadas. Os AGCs do ácido linoléico (ALCs são encontrados naturalmente em alimentos derivados de animais ruminantes, carnes e produtos lácteos. Os AGCs do ácido α-linolênico (ALNCs são encontrados exclusivamente em óleos de sementes de vários tipos de plantas. Desenvolvem-se muitas investigações com o objetivo de avaliar os efeitos do consumo de AGCs para a saúde, já que estes têm sido associados a processos fisiológicos relacionados com doenças crônicas não transmissíveis como câncer, aterosclerose, inflamação e obesidade. Estudos conclusivos sobre os efeitos dos AGCs no organismo humano ainda são raros e mais pesquisas sobre sua atuação em processos fisiológicos são necessárias. O objetivo desta revisão é discutir a influência dos ácidos graxos conjugados sobre os processos fisiológicos.

  11. Wastewater disinfection with peracetic acid and UV; La disinfezione di acque reflue con acido peracetico e raggi ultravioletti

    Energy Technology Data Exchange (ETDEWEB)

    Caretti, C.; Lubello, C. [Florence Univ., Florence (Italy). Dipt. di Ingegneria Civile

    2001-06-01

    Was investigated the synergy between UV and peracetic acid (PAA) through a five months on-site experimental study in a pilot plant fed by the secondary effluent of the central wastewater treatment plant of Pistoia, Italy. This experiment is a part of a larger research project on advanced treatment for municipal wastewater reuse in agriculture. Because of Italy's strict limits on unrestricted wastewater reuse in agriculture (2 CFU total coliform/100 ml), a very high degree of disinfection is necessary. In the investigated experimental conditions, it has been impossible to meet such values through an exclusive use of UV irradiation (the UV unit reaches at most 4 Log inactivation). Low levels of PAA greatly enhance the decline of indicator levels, but higher unsustainable doses are required to hit the Italian limit. Through a poor amount of information on the subject was available in literature, it was tried to find out how the disinfection efficiency could improve by simultaneously using UV and PAA. It was found out that a combined treatment is satisfactory and that it is more advantage of the hydroxyl radicals formation due to the PAA photo lysis. The application of 2 ppm of PAA with an UV dose of 192 mWscm{sup -}2 is enough to meet the Italian limit. [Italian] Nel presente articolo si riportano i risultati di uno studio sulla sinergia tra acido peracetico (PAA) e raggi ultravioletti nella disinfezione delle acque reflue secondarie; le prove sono state effettuate su scala pilota, presso l'impianto centrale di Pistoia. Tale sperimentazione fa parte di un piu' ampio progetto di ricerca sulla possibilita' di riutilizzare le acque reflue a scopo irriguo; per rispettare i limiti estremamente stringenti imposti dalla normativa italiana per l'irrigazione (2 CFU Coliformi totali/100 ml, nel caso di irrigazione illimitata), e' necessario garantire efficienze di disinfezione molto elevate. Nelle condizioni sperimentali considerate, non e

  12. Further diffusion tensor imaging contribution in horizontal gaze palsy and progressive scoliosis Contribuição adicional das imagens por tensores de difusão em paralisia do olhar conjugado horizontal associada a escoliose progressiva

    Directory of Open Access Journals (Sweden)

    Maria Conceptión García Otaduy

    2009-12-01

    Full Text Available In two siblings with clinical diagnosis of horizontal gaze palsy associated with progressive scoliosis (HGPPS we could demonstrate by diffusion tensor imaging: (1 An anterior displacement of the transverse pontine fibers; (2 Posterior clumping of the corticospinal, medial lemniscus and central tegmental tracts and of the medial and dorsal longitudinal fasciculi complex; (3 Absent decussation of superior cerebellar peduncle. Those findings can contribute as surrogate markers for the diagnosis.Em dois irmãos com diagnóstico clínico de paralisia do olhar conjugado horizontal associada a escoliose progressiva, foi possível determinar através de imagens por tensores de difusão: (1 Deslocamento anterior das fibras pontinas transversas; (2 Agrupamento posterior do trato córtico-espinhal, lemnisco medial e trato tegmentar central e complexos dos fascículos longitudinais medial e dorsal; (3 Ausência da decussação dos pedúnculos cerebelares superiores. Tais achados podem contribuir como marcadores para o diagnóstico.

  13. Avaliação de frações antigênicas de Cysticercus cellulosae para o imunodiagnóstico da neurocisticercose utilizando conjugados anticorpo-lectina

    Directory of Open Access Journals (Sweden)

    Cláudio Lúcio Rossi

    1989-09-01

    Full Text Available Um extrato bruto de Cysticercus cellulosae foi fracionado por cromatografia em coluna de Sephadex G-200, com o objetivo de se encontrar alguma fração com alta atividade antigênica para ser utilizada no imunodiagnóstico da neurocisticercose. O perfil de eluição proteico da cromatografia revelou dois picos distintos (frações I e III e, entre os dois uma fração bastante heterogênea composta de vários picos (fração II. Uma técnica baseada na utilização de conjugados contendo lectina com afinidade para eritrocitos (Erythro - LIT foi utilizada para a avaliação das frações. Os títulos de Erythro-LIT obtidos com o extrato bruto de cisticercos e com as frações mostraram que a maior parte dos anticorpos anti Cysticercus cellulosae, presentes em amostras de líquido cefalorraqueano de pacientes com neurocisticercose, reconheceram componentes antigênicos da fração II.

  14. Effect of conjugated linoleic acid supplementation on lipoprotein lipase activity in 3T3-L1 adipocyte culture Efeito da suplementação com ácido linoléico conjugado sobre a atividade da lípase lipoprotéica em cultura de adipócitos 3T3-L1

    Directory of Open Access Journals (Sweden)

    Adriana Prais Botelho

    2009-10-01

    Full Text Available Supplementation with conjugated linoleic acid may reduce fat body mass and increase lean body mass in various species. Some studies have demonstrated that conjugated linoleic acid reduces body fat, in part, by inhibiting the activity of lipoprotein lipase in adipocytes. The objective of this work was to study the effect of conjugated linoleic acid supplementation on lipoprotein lipase activity in 3T3-L1 adipocyte culture. 3T3-L1 adipocytes received linoleic acid (group C or conjugated linoleic acid (group AE, supplemented with AdvantEdge® CLA, and group CO, supplemented with CLA One® in concentrations of 1 mmol/L. Heparin-releasable lipoprotein lipase activity was analyzed by means of a 3T3-L1 adipocyte culture. After 7 days, heparin-releasable lipoprotein lipase activity was lower in the groups AE and CO supplemented with conjugated linoleic acid. These results suggest that one of the mechanisms by which CLA is capable of reducing body fat is by reducing lipoprotein lipase activity.A suplementação com ácido linoléico conjugado pode reduzir a gordura corporal e aumentar a massa magra em diferentes espécies. Alguns estudos têm demonstrado que o ácido linoléico conjugado reduz a gordura corporal, por meio da inibição da atividade de lípase lipoprotéica em adipócitos. O objetivo deste estudo foi avaliar o efeito da suplementação com uma mistura de isômeros do ácido linoléico conjugado sobre a atividade da lípase lipoprotéica em cultura de adipócitos 3T3-L1. Os adipócitos 3T3-L1 receberam ácido linoléico (grupo controle ou ácido linoléico conjugado (grupo AE, suplementado com AdvantEdge® CLA, e grupo CO, suplementado com CLA One® na concentração de 1 mmol/L. A atividade de lípase lipoprotéica livre de heparina foi analisada pela média da cultura de adipócitos. Após 7 dias, a atividade da lípase lipoprotéica livre de heparina mostrou menores valores nos grupos AE e CO, suplementados com ácido linol

  15. Effect of conjugated equine estrogens and tamoxifen administration on thyroid gland histomorphology of the rat Os efeitos dos estrogênios conjugados equinos e do tamoxifeno na histomorfologia da glândula tireóide de ratas

    Directory of Open Access Journals (Sweden)

    Luiz Felipe Bittencourt de Araujo

    2006-08-01

    Full Text Available OBJECTIVE: The aim of this study was to evaluate the action of the conjugated equine estrogens and tamoxifen on the morphology of thyroid gland in ovariectomized (OVx rats. METHODS: Conjugated equine estrogens (CEE, clinically used as estrogen therapy, is a complex formulation containing multiple estrogens that decrease menopausal symptoms. Thirty ovariectomized rats were randomly divided into 3 treatment groups: GI, vehicle (propylene glycol; GII, CEE 200 µg/kg per day; and GIII, tamoxifen 1 mg/kg per day. Another group of 10 rats with intact ovaries (GIV was included, treated with the vehicle, and sacrificed during estrous. All animals were treated by gavage for 50 days, after which they were sacrificed. Blood samples were collected, and the thyroid was removed for morphological analysis and PCNA evaluation through immunohistochemical study. RESULTS: The thyroid follicular cell height was increased in animals treated with CEE (14.90 ± 0.20 µm, with TAM (14.90 ± 0.10 µm, and in rats with intact ovaries (15.10 ± 0.50 µm in comparison to that of the vehicle group (9.90 ± 0.20 µm (P OBJETIVO: Avaliar a ação dos estrogênios conjugados eqüinos e do tamoxifeno na histomorfologia da tireóide de ratas. MÉTODO: Estrogênios conjugados eqüinos são ministrados clinicamente como terapia estrogênica e contêm formulação complexa com muitos tipos de estrogênios que diminuem os sintomas da pós-menopausa. Trinta ratas adultas ooforectomizadas foram divididas aleatoriamente em três grupos: GI - veículo (propilenoglicol; GII - ECE 200 µg/Kg por dia; e GIII - TAM 1 mg/Kg por dia. Acrescentou-se ainda um grupo de 10 animais com os ovários intactos e tratados com veículo (GIV. Todos os animais foram tratados por gavagem durante 50 dias consecutivos, ao final foram coletadas amostras do sangue e a tireóide removida e processada para análise morfológica e imunohistoquímico para avaliar o PCNA. RESULTADOS: A maior altura das c

  16. ESTUDIO DE LA ADSORCIÓN DE PROTEÍNAS SOBRE SUPERFICIES DE ACIDO POLILÁCTICO MEDIANTE TÉCNICAS GRAVIMÉTRICAS Y ELECTROQUÍMICAS

    Directory of Open Access Journals (Sweden)

    HUGO ARMANDO ESTUPIÑAN DURAN

    2011-01-01

    Full Text Available Metodos electroquimicos fueron utilizados para promover y evaluar la adsorcion orientada de albumina y colageno sobre superficies polimericas de acido polilactico (PLA mediante la aplicacion de un sobrepotencial anodico en un rango de 0 V a 0,45 V. La adsorcion fueestudiada usando mediciones simultaneas de espectroscopia de impedancia electroquimica (EIE y microbalanza de cristal de cuarzo (QCM, en un rango de temperaturas de 25°C a 45°C, con variaciones en proteina entre 5 y 20 ¿Êg/ml en solucion buffer de fosfato de pH 7,4. Con el aumento de la concentracion de proteinas en el electrolito, disminuye la resistencia a la transferencia de carga, exhibiendo asi una mayor adsorcion sobre la superficie, ademas de aumentar la magnitud de los cambios de masa. Se mejoro la hidrofilicidad del recubrimiento, mostrando una mayor afinidad con las soluciones de colageno y por lo tanto un aumento en la biocompatibilidad debido a la activacion superficial.

  17. ANALISIS DEL CO-TRATAMIENTO PASIVO DE AGUAS RESIDUALES MUNICIPALES Y DRENAJE ACIDO DE MINAS EN CERRO RICO DE POTOSÍ, BOLIVIA

    Directory of Open Access Journals (Sweden)

    William H.J. Strosnider

    2015-01-01

    Full Text Available El drenaje acido de minas (DAM es un problema a nivel mundial. El co-tratamiento pasivo de DAM con aguas residuales municipales (ARM es una manera efectiva y de bajo costo que utiliza los nutrientes de ARM para tratar las concentraciones de metales y sulfato en DAM. Cerro Rico de Potosí, Bolivia es una de las grandes ciudades mineras en el mundo que tiene muchos problemas con el DAM. El objetivo de este estudio fue determinar velocidades de reacción de Al, Fe, Mn, Zn, y otros metales en DAM provenientes de un flujo de agua en Cerro Rico usando un sistema reactor de tres etapas. El DAM tenía un pH de 3.58, acidez de 1080 mg/L equivalente a CaCO3 conteniendo concentraciones de 12, 68, 17, y 550 mg/L de Al, Fe, Mn y Zn respectivamente. Las velocidades de reacción de Al, Fe, Mn y Zn fueron de 1.43, 2.09, 0.01 y 0.10 d-1, respectivamente.

  18. Hydrogen sulfide corrosion of weld regions in API X52 steel; Corrosion por acido sulfhidrico de las regiones de soldadura en acero API X52

    Energy Technology Data Exchange (ETDEWEB)

    Arenas-Martinez, L.F [Universidad Autonoma de Coahuila, Coahuila (Mexico)]. E-mail: fernando.arenas@uadec.edu.mx; Garcia-Cerecero, G. [Corporacion Mexicana de Investigacion en Materiales S.A. de C.V., Saltillo, Coahuila (Mexico)]. E-mail: ggarcia@comimsa.com

    2012-10-15

    The corrosion behavior of gas metal arc welding (GMAW) regions has been studied using potentiodynamic polarization and polarization resistance (LPR) techniques. Experiments were conducted in hydrogen sulfide (H{sub 2}S)-containing brine and in H{sub 2}S-free brine. Welds were made on API 5L X52 steel. Due to differences in their microstructure, chemical composition and residual stress level, weld regions exhibited different responses under H{sub 2}S corrosion. Base metal exhibited the highest corrosion rate (CR) and the most cathodic corrosion potential. [Spanish] Se estudio el comportamiento ante la corrosion de las regiones de soldadura de un cordon realizado por arco metalico con gas (GMAW) sobre un acero grado API X52 mediante las tecnicas de polarizacion potencio dinamica y resistencia a la polarizacion (LPR). Los experimentos se realizaron utilizando salmuera con 300 ppm de acido sulfhidrico (H{sub 2}S) y salmuera libre de H{sub 2}S como electrolitos. Debido a las diferencias en su microestructura, composicion quimica y el nivel de esfuerzos residuales, las regiones de soldadura mostraron diferentes respuestas a la corrosion por H{sub 2}S. El metal base exhibio la velocidad de corrosion (VC) mas alta y el potencial de corrosion mas catodico.

  19. Efeitos da isoflavona e dos estrogênios conjugados eqüinos sobre a qualidade de vida na pós-menopausa Effects of isoflavone and conjugated equine estrogen on the postmenopausal quality of life

    Directory of Open Access Journals (Sweden)

    Lúcia Helena Laprano Vieira

    2007-05-01

    Full Text Available OBJETIVO: analisar os efeitos da isoflavona e do estrogênio sobre a qualidade de vida de mulheres na pós-menopausa. MÉTODOS: realizou-se estudo randomizado, duplo-cego, com 79 pacientes, amenorréia de 12 meses, idade superior a 40 anos e índice de massa corporal (IMC superior a 30 kg/m². As mulheres foram aleatoriamente divididas em dois grupos de tratamento: GECP recebeu duas cápsulas, via oral, de 12/12 horas, uma contendo 0,625 mg de estrogênios conjugados eqüinos e, a outra, placebo (n=33; GECS recebeu duas cápsulas de 150 mg de extrato de soja, com 60 mg de isoflavonas cada (n=32, por seis meses. O Questionário de Qualidade de Vida Específico para Menopausa foi empregado antes e após um, três e seis meses de tratamento. Os parâmetros do risco de câncer ginecológico foram avaliados. Para análise dos dados, aplicaram-se os testes de ANOVA e de Tukey. RESULTADOS: quanto aos parâmetros vasomotores, houve redução nos valores após seis meses de tratamento, 1,6±0,8 e 2,4±1,6, em relação aos valores antes da terapia, 4,0±2,2 e 4,2±2,3, respectivamente, nos GECP e GECS. Os aspectos psicossociais mostraram diminuição dos valores após seis meses de terapia, 2,5±1,2 e 2,9±1,4, em relação aos valores antes da terapia, 3,6±1,6 e 4,1±1,9, respectivamente, nos GECP e GECS. De forma semelhante ocorre no aspecto físico e nos sintomas sexuais. CONCLUSÕES: as isoflavonas agem positivamente na qualidade de vida de mulheres na pós-menopausa, semelhantemente aos estrogênios conjugados eqüinos.PURPOSE: to analyze the isoflavone and estrogen effects on the postmenopausal quality of life. METHODS: this is a randomized and double-blind study with 79 postmenopausal patients, 12 months of amenorrhea, 40 years old or more and body mass index (BMI above 30 kg/m². The participants were randomly divided into two treatment groups: GECP received orally two capsules, every 12 hours, one contained 0.625 mg conjugated equine estrogen

  20. Os efeitos do ácido linoléico conjugado no metabolismo animal: avanço das pesquisas e perspectivas para o futuro Effects of conjugated linoleic acid on animal metabolism: advances in research and perspectives for the future

    Directory of Open Access Journals (Sweden)

    Lilia Ferreira Santos-Zago

    2008-04-01

    Full Text Available Realizou-se uma revisão sistemática, sem restrição de data, sobre os efeitos fisiológicos do ácido linoléico conjugado sobre a regressão da carcinogênese, o estresse oxidativo, o metabolismo de lípides e glicose e a alteração da composição corporal. Objetivando estabelecer o aspecto histórico do avanço da pesquisa em ácido linoléico conjugado, consideraram-se artigos originais resultantes de trabalhos realizados com animais, com cultura de células e com humanos. Quanto às pesquisas sobre o efeito anticarcinogênico do ácido linoléico conjugado foram encontradas inúmeras evidências a esse respeito, especialmente na regressão dos tumores mamários e de cólon, induzida por ambos os isômeros os quais agem de maneiras distintas. Os pesquisadores se empenham em reinvestigar as propriedades antioxidantes do ácido linoléico conjugado. Embora tenham sido investigadas as propriedades antioxidantes, tem-se identificado efeito pró-oxidante, levando ao estresse oxidativo em humanos. Foram poucos os estudos que demonstraram efeito positivo significativo do ácido linoléico conjugado sobre o metabolismo dos lípides e da glicose e sobre a redução da gordura corporal, especialmente em humanos. Estudos sobre efeitos adversos foram também identificados. Há fortes indícios de que a ação deste ácido graxo conjugado sobre uma classe de fatores de transcrição - os receptores ativados por proliferadores de peroxissomo - e sobre a conseqüente modulação da expressão gênica, possa ser a explicação fundamental dos efeitos fisiológicos. Embora incipientes, os mais recentes estudos reforçam o conceito da nutrigenômica, ou seja, a modulação da expressão gênica induzida por compostos presentes na alimentação humana. O cenário atual estimula a comunidade científica a buscar um consenso sobre os efeitos do ácido linoléico conjugado em humanos, já que este está presente naturalmente em alguns alimentos, que, quando

  1. The use of peracetic acid in drinking water systems: flow tests; L'acido peracetico in potabilizzazione: prove in flusso

    Energy Technology Data Exchange (ETDEWEB)

    Ragazzo, P. [Consorzio per l' Acquedotto del Basso Piave, San Dona' di Piave, VE (Italy); Navazio, G. [Padua Univ., Padua (Italy). Dipt. dei Processi Chimici dell' Ingegneria; Cavadone, A. [Solvay Chimica Italia S.p.A., Milan (Italy)

    2000-09-01

    In a previous research, a preliminary study was carried out on the disinfection efficiency of peracetic acid (PAA), comparing it to that of other disinfectants that are typically used, in batch tests with dosage values ranging from 0.5 to 5 ppm. The study was carried out on samples of water collected from several significant points of the treatment process at the main water treatment plant in Jesolo (Venice, Italy). On the basis of results (basically positive at that time) obtained from these tests, a 400 litre/hour pilot plant was built, as a lower scale reproduction of the drink water treatment system mentioned earlier, in order to study the characteristics of PAA even in tests that could more realistically simulate the flow of water along the process. These tests essentially confirmed the kinetics of the spontaneous hydrolysis to CH{sub 3} COOH+H{sub 2}O{sub 2} and those of dismutation to CH{sub 3}COOH+O{sub 2}, with half-life time values ranging from 3 to 12 hours, depending on the characteristics of the water (especially the pH factor) and the PAA concentration values. [Italian] In un precedente lavoro e' stato effettuato un preventivo studio sull'efficienza disinfettiva dell'acido peracetico, anche in confronto con gli altri piu' usuali disinfettanti, in prove condotte in batch, con dosaggi compresi tra 0.5 e 5 ppm, su campioni di acqua prelevati dai diversi punti significativi della linea di trattamento della centrale di Jesolo (Torre Caligo), gestita dal Consorzio Acquedottistico del Basso Piave di S. Dona' di Piave (Venezia). Sulla base dei risultati, sostanzialmente positivi, e' stato costruito un impianto pilota da 400l/h, riproducente, in scala, la linea di potabilizzazione su ricordata, per studiare le caratteristiche del PAA anche in prove piu' probanti condotte in flusso. In tali prove sono state sostanzialmente riconfermate le cinetiche delle reazioni spontanee di dirolisi a CH{sub 3}COOH+H{sub 2}O{sub 2} e di

  2. Determination of the load state of lead-acid batteries using neural networks; Determinacion del estado de carga de baterias plomo-acido utilizando redes neuronales

    Energy Technology Data Exchange (ETDEWEB)

    Cristin V, Miguel A; Ortega S, Cesar A [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2005-07-01

    The charge of lead-acid batteries (LAB), as in any other type of batteries, consists of replacing the energy consumed during the discharge. Nevertheless, as no physical or chemical process is good enough to totality recharge a battery, it is necessary to supply to it more than the 100% of the energy demanded during its discharge. A critical factor to make a suitable load control of the batteries is to determine its own state of load. That is to say, to have an efficient load control, it is necessary to count on means that allow to accurately determining the residual capacity of the battery to deliver load. This one is the one of the aspects of greater interest in the research centers around world. For this reason, in this work it was pretended to develop a calculation algorithm of the state of load of batteries based on a fuzzy-neural network that could calculate the state of load without using the battery current as an input. This is because one of the main problems for the designers of battery load controllers is the correct supervision of the current that circulates around the system in all the rank of operation of the same one because the sensors do not have a linear behavior. [Spanish] La recarga de baterias plomo-acido (BPA), como cualquier otro tipo de baterias, consiste en reponer la energia consumida durante la descarga. Sin embargo, como ningun proceso fisico o quimico es lo bastante eficiente para recargar a totalidad una bateria, es necesario suministrarle mas del 100% de la energia demandada durante su descarga. Un factor critico para realizar un adecuado control de carga de las baterias, es determinar su propio estado de carga. Es decir, para tener un control de carga eficiente, es necesario contar con un medio que permita determinar con precision la capacidad remanente de la bateria para entregar carga. Este es uno de los aspectos de mayor interes en los centros de investigacion alrededor el mundo. Por tal razon, en este trabajo se propuso

  3. Proposal to neutralize acid fluids from wells in the Los Humeros, Pue., geothermal field; Propuesta para la neutralizacion de fluidos acidos provenientes de pozos del campo geotermico de Los Humeros, Pue.

    Energy Technology Data Exchange (ETDEWEB)

    Flores Armenta, Magaly del Carmen; Ramirez Montes, Miguel; Garcia Cuevas, Juan Manuel [Comision Federal de Electricidad, Gerencia de Proyectos Geotermoelectricos, Morelia, Michoacan (Mexico)]. E-mail: magaly.flores@cfe.gob.mx

    2009-07-15

    Neutralizing an acidic fluid consists of adding a sodium hydroxide solution to neutralize the H group of acids, therefore increasing the pH. The injection of sodium hydroxide has to be continuous and at a proper depth inside the well to protect against the corrosion of casing and surface equipment. Neutralization is a common practice used in geothermal fields, such as at The Geysers in the US and Miravalles in Costa Rica-places where aggressive fluids cause problems for extracting and using geothermal fluids commercially. A zone surrounding wells H-4, H-16 and H-29 in the northern section of the Los Humeros, Pue., geothermal field, known as the Colapso Central, has shown evidence of aggressively acidic fluids. Several wells drilled in the area had to be repaired, thus plugging and isolating the deepest production zones. Well H-43 was drilled two years ago in the northern zone of the field, and even though it is not located in the aggressive-fluid zone, the well presents mineralogical features possibly indicating the presence of acidic fluids. Therefore, before producing this well it has been proposed we install a neutralization system with general characteristics presented in this paper. The system will prevent corrosion that up to now has prevented exploitation of the deep portion of Colapso Central, helping to develop the field in a more profitable way. [Spanish] Neutralizar un fluido acido consiste en agregarle una solucion de hidroxido de sodio. Esto neutraliza el grupo de acidos H y en consecuencia aumenta el pH. La inyeccion de hidroxido de sodio se realiza de manera continua y a una profundidad adecuada dentro del pozo para proteger a la tuberia y a todo el equipo superficial contra la corrosion. La neutralizacion es una practica comun que se viene realizando en campos como Los Geysers en Estados Unidos y en Miravalles, Costa Rica, donde la presencia de fluidos agresivos causa problemas en la extraccion y aprovechamiento del fluido geotermico con fines

  4. Obtención de un conjugado anti IgG de ratón - FITC mediante la tecnología IgY para uso como anticuerpo secundario en la detección de antígenos de superficie celular

    Directory of Open Access Journals (Sweden)

    Esteban J. Gutiérrez Calzado

    2007-01-01

    Full Text Available Desde el año 1996, el Centro Europeo para la Validación de Métodos Alternativos recomendó el uso de la IgY como sustituto de la IgG de mamíferos con el objetivo de reducir al mínimo las situaciones de daño que se les causa a los animales que se someten a la producción de anticuerpos (Acs. En 1999, la tecnología IgY se aprobó por la Oficina Federal Veterinaria del gobierno suizo como un método alternativo para sustentar el cuidado y bienestar de los animales. Muchas de las publicaciones relacionadas con IgY demuestran las características desde el punto de vista bioquímico de esta inmunoglobulina que la hace tomar ventajas sobre la IgG, entre las que refiere que los complejos inmunes que contienen Acs aviares, no pueden interactuar con los receptores Fc o del complemento sobre las células, por lo que el reemplazamiento de los Acs de mamíferos por sus similares en gallinas pudieran evitar interferencias en muchos ensayos diagnósticos. Este conocimiento ha sido la base objetiva de este trabajo que consistió en la obtención de Acs IgY anti IgG de ratón con elevado grado de pureza, los que fueron conjugados por unión covalente vía grupos amino primarios libres al isotiocianato de fluoresceína (FITC. Estos conjugados mostraron poseer una razón molar FITC/proteína en intervalos reportados para un buen desempeño. La dilución óptima de trabajo obtenida para ellos fue muy adecuada y demostró su utilidad como Acs secundarios en el conteo de antígenos de superficie celular linfocitario humano por sus resultados comparables con los reactivos similares de origen mamífero ensayados en paralelo.

  5. Synthesis and characterization of PdAg as a catalyst for oxygen reduction reaction in acid medium; Sintesis y caracterizacion de PdAg como catalizador para la reaccion de reduccion de oxigeno en medio acido

    Energy Technology Data Exchange (ETDEWEB)

    Martinez-Casillas, D. C.; Vazquez-Huerta, G.; Solorza-Feria, O. [Centro de Investigacion y de Estudios Avanzados del IPN, Mexico D.F. (Mexico)]. E-mail: dcmartinez@cinvestav.mx

    2009-09-15

    This work presents the synthesis of the binary compound PdAg and the electrochemical characterization for oxygen reduction reaction (ORR) in acid medium. The catalyst is obtained from the reduction of Pd(NO{sub 3}){sub 2}·2H{sub 2}O and AgNO{sub 3} with NaBH{sub 4} in THF. The synthesized compound was physically characterized with transmission electron microscopy (TEM), sweep electron microscopy (SEM) and x-ray diffraction (XRD) of powder. Electrochemical studies were conducted to determine the catalytic activity and intrinsic properties of the PdAg material for the ORR in acid medium using cyclic voltamperometry (CV), rotary disc electrode (RDE) and electrochemical impedance spectroscopy (EIS) in a solution of H{sub 2}SO{sub 4} 0.5 M at 25 degrees Celsius. The electrochemical current-potential responses were compared to those of palladium and platinum. The kinetic results showed an increase in the performance of the bimetallic electrocatalyst containing Ag as compared to pure Pd, but less than that obtained with nanometric Pt. The Tafel slopes obtained are roughly120 mV dec-1, similar to that reported for Pt and Pd and for other Ru-based electrocatalysts. [Spanish] En este trabajo se presentan la sintesis del compuesto binario PdAg y su caracterizacion electroquimica para la reaccion de reduccion de oxigeno (RRO) en medio acido. El catalizador se obtuvo a partir de la reduccion de Pd(NO{sub 3}){sub 2}·2H{sub 2}O y AgNO{sub 3} con NaBH{sub 4} en THF. El compuesto sintetizado se caracterizo fisicamente por microscopia electronica de transmision (MET), microscopia electronica de barrido (MEB) y difraccion de rayos X (DRX) de polvos. Se realizaron estudios electroquimicos para determinar la actividad catalitica y las propiedades intrinsecas del material de PdAg para la reaccion de reduccion de oxigeno (RRO) en medio acido, utilizando las tecnicas de voltamperometria ciclica (VC), electrodo disco rotatorio (EDR) y espectroscopia de impedancia electroquimica (EIE), en

  6. Double blind randomized clinical trial controlled by placebo with an alpha linoleic acid and prebiotic enriched cookie on risk cardiovascular factor in obese patients Ensayo clínico aletorizado doble ciego controlado con placebo con una galleta enriquecida en ácido alfa linoleico y prebióticos en el patrón de riesgo cardiovascular de pacientes obesos

    Directory of Open Access Journals (Sweden)

    D. A. de Luis

    2011-08-01

    Full Text Available Introduction: Inulin and FOS are prebiotics with potential benefit in cardiovascular risk factors. Alpha linolenic acid (ALA is the metabolic precursor of the long chain n-3 fatty acid eicosapentaenoic acid (20: 5n-3, this fatty acid has anti-inflammatory properties. The aim of our study was to evaluate the response of the cardiovascular risk profile in obese patients after inclusion in the diet of an ALA, FOS and inulin enriched-cookie. Material and methods: 36 patients were randomized in both branches: group I (inulin, FOS and ALA enriched cookie Gullon SL® and group II (control cookie. Previous and after 1 month of the treatment, a nutritional and biochemical study was realized. Results: 15 patients finished the procotol in each group. In group I, a significantly increase in soluble fiber (2.3 ± 0.8 g/day vs 7.7 ± 0.8 g/day: p Introducción: La inulina y los FOS son prebióticos con potenciales efectos beneficiosos a nivel cardiovascular. El acido alfa linolénico (ALA es el precursor del ácido eicosapentaenoico (20: 5n-3, presentando propiedades antinflamatorias. El objetivo de nuestro trabajo es evaluar la respuesta del perfil de riesgo cardiovascular en pacientes obesos tras la inclusión en la dieta de una galleta enriquecida en inulina, FOS y ALA. Material y métodos: Un total de 36 pacientes fueron randomizados a una de las siguientes ramas: galleta I (enriquecida con inulina, FOS y ALA y galleta II (galleta control (Gullón SL. Cada paciente recibió un total de 2 galletas al día (70 gramos de producto. Antes de iniciar el tratamiento y al mes, se realizó una valoración nutricional y analítica. Resultados: Finalizaron el protocolo un total de 15 pacientes en cada grupo. En el grupo I se produjo un aumento significativo en la ingesta de fibra soluble (2,3 ± 0,8 g/día vs 7,7 ± 0,8 g/día: p < 0,05 (inulina y FOS, así como ALA (0,6 ± 0,5 g/día vs 3,8 ± 0,5 g/día; p < 0,05. Se detectó en los pacientes varones que

  7. Body measurements and serum lipid profile of overweight adult dogs fed diet with containing conjugated linoleic acid Medidas corporais e perfil lipídico plasmático de cães adultos com sobrepeso alimentados com dieta contendo ácido linoléico conjugado

    Directory of Open Access Journals (Sweden)

    Nancy Lorena Montaño Rivera

    2011-11-01

    Full Text Available Studies with human beings and animals have shown that dietary conjugated linoleic acid (CLA promotes changes in body structure, markedly, body fat reduction. This research aimed to assess the effect of CLA (60% of conjugated linoleic acid methyl ester, at the proportion of 1:1 of the 9, 11: 10, 12 isomers on changes in body weight, subcutaneous tissue thickness, body fat mass and concentration of serum lipids (triacylglycerols, total cholesterol, LDL and HDL in overweight dogs. Dogs of different breeds weighting 16.85±7.13 assigned in a randomized assay. Two types of diets were offered for 120 days: control (-CLA and test (+CLA, 0.3%. There was no difference between control and test groups considering body weight and serum levels of triacylglycerols, total cholesterol and LDL portion. There was a significant difference between the final and initial results for subcutaneous tissue thickness and body fat mass and for serum concentration of HDL in dogs supplemented with CLA. The addition of 0.3% of CLA in the diet of overweight dogs decreased the fat deposition on subcutaneous tissue and the development of body fat mass but increased blood levels of HDL.Estudos em humanos e animais têm demonstrado que o uso do ácido linoléico conjugado (ALC promove alterações na composição corporal, principalmente reduzindo a deposição de gordura. O objetivo deste trabalho foi avaliar as alterações sobre o peso corporal, tecido adiposo subcutâneo, gordura corporal e concentração sérica de lípideos (triacilglicerol, colesterol total, LDL e HDL de cães com sobrepeso alimentados com ALC (60% de ácido linoléico conjugado metil ester, na proporção de 1:1 de 9, 11: 10, 12 isômeros na dieta. Duas dietas foram fornecidas por quatro meses, para 14 cães com sobrepeso (16,85±7,13 de diferentes raças: dietas controle (-ALC e teste (+ALC, 0,3%. O experimento seguiu delineamento inteiramente casualizado. Não houve diferença entre os grupos para peso

  8. Results of test of acid fluids neutralization in the well H-43, Los Humeros geothermal field, Puebla; Resultados de la prueba de neutralizacion de fluidos acidos en el pozo H-43, campo geotermico de Los Humeros, Puebla

    Energy Technology Data Exchange (ETDEWEB)

    Flores Armenta, Magaly del Carmen; Ramirez Montes, Miguel; Sandoval Medina, Fernando; Rosales Lopez, Cesar [Comision Federal de Electricidad, Gerencia de Proyectos Geotermoelectricos, Morelia, Michoacan (Mexico)]. E-mail: magaly.flores@cfe.gob.mx

    2011-07-15

    The well H-43 was drilled in Los Humeros Geothermal Field, Pue., in 2007 and 2008. When well production was measured, it was found the well produced acid fluids with high corrosion potential. Then it was decided to try to neutralize the acidity of the H-43 fluids by adding a solution of sodium hydroxide. This is a basic substance used to neutralize mainly the acid groups H+, and the goal was to raise the pH of the fluids to minimize its corrosive features. First sodium hydroxide was injected into the well to protect the casing of 244.4 mm (9 5/8 in) against corrosion and then all the surface installations. It was possible to increase the pH of the well fluid from 5.2 up to 6.8 without altering the steam production, thus demonstrating the neutralization procedure is feasible. The approximate costs of the neutralization tests performed, including equipment for the proposed neutralization system, the neutralizer (NaOH), and drilling the well are about 71.4 million pesos (around 5.5 million USD). We estimate a benefit/cost ratio of 1.5 and a return on investment in five years, considering the income from energy sales at present value. [Spanish] El pozo H-43 fue perforado en el campo de Los Humeros, Pue., en 2007-2008, y al evaluar su produccion se encontro que producia fluidos acidos de alto potencial corrosivo. Se decidio por tanto realizar una prueba para neutralizar la acidez de los fluidos de este pozo, que consistio en agregarle una solucion de hidroxido de sodio. Esta es una sustancia basica que neutraliza principalmente los grupos acidos H+, con lo que se buscaba aumentar el pH del fluido lo necesario para reducir al maximo su caracter corrosivo. La inyeccion del hidroxido de sodio se realizo dentro del pozo a fin de proteger de la corrosion a la tuberia de revestimiento de 244.4 mm (9 5/8 pulgadas), y posteriormente a todos los equipos superficiales. Como resultado de la prueba, se logro aumentar el pH del fluido producido por el pozo de 5.2 a un maximo de 6

  9. Ácido linoléico conjugado, na nutrição de suínos, sobre desempenho zootécnico, características de carcaça e rendimento de cortes Conjugated linoleic acid in swine nutrition on animal performance, carcass traits and cut yield

    Directory of Open Access Journals (Sweden)

    Diego Surek

    2011-12-01

    Full Text Available O experimento foi conduzido com o objetivo de avaliar o efeito da inclusão de ácido linoléico conjugado (CLA em dietas de suínos dos 65kg de peso vivo até a fase de abate (100kg sobre desempenho zootécnico, rendimento de corte e características de carcaça. Foram utilizados 200 suínos provenientes do cruzamento industrial JSR x PIC, em igual proporção de sexo. Os tratamentos foram compostos por dietas com (+CLA e sem (-CLA adição de CLA. O delineamento experimental utilizado foi completamente casualizado, sendo as características de carcaça avaliadas em esquema fatorial 2x2 (dieta x sexo. Os animais que consumiram CLA apresentaram melhor ganho de peso diário, redução da espessura de toucinho e maior rendimento de carne magra. A retenção de líquidos da carne não apresentou diferença em relação à dieta. Conclui-se, com base nos resultados, que é benéfica a inclusão de CLA na alimentação de suínos em terminação.The proposal of this study was to evaluate the effect of conjugated linoleic acid (CLA supplementation on swine diets, reared from 65kg body weight up to slaughter (100kg body weight on animal performance, cut yields and carcass traits. Two hundred crossbred pigs (JSR x PIC were used, half barrows and half gilts. The treatments were diets with (+CLA and without (-CLA supplementation of CLA. A completely randomly experimental design was used, and for the carcass traits and cut yield it was a 2x2 factorial design (diet and sex. Animals that consumed CLA presented a better average daily gain, decreased backfat thickness and a higher lean meat yield. Meat liquid retention capacity was not affected by diets. Based in these results it is beneficial the inclusion of CLA on finishing pigs feed.

  10. REVIEW. BACTERIAS ACIDO LÁCTICAS: PAPEL FUNCIONAL EN LOS ALIMENTOS BACTÉRIAS ÁCIDO LÁCTICAS: PAPEL FUNCIONAL NOS ALIMENTOS REVIEW LACTIC ACID BACTERIA: FUNCTIONAL ROLE IN THE FOODS

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    RICARDO ADOLFO PARRA HUERTAS

    2010-06-01

    Full Text Available Las bacterias ácido lácticas han sido importantes en los alimentos por siglos por su considerable contribución al valor de los productos. Debido a varias de sus propiedades metabólicas, las bacterias ácido lácticas desempeñan un papel importante en la industria alimentaria, por su contribución significante al sabor, olor, textura, características sensoriales, propiedades terapéuticas y valor nutricional de los productos alimentarios. Este grupo está compuesto de un número de géneros incluyendo Lactococcus, Lactobacillus, Enterococcus, Streptococcus, Leuconostoc y Pediococcus. Algunos de los metabolitos producidos por las este tipo de bacterias son ácidos orgánicos, sustancias preservantes, polisacáridos, vitaminas, endulzantes, olores y sabores entre otros. Esta revisión se enfoca en estudiar la importancia de las bacterias acido lácticas en los alimentos.As bacterias ácido lácticas têm sido importantes nos alimentos por séculos pela sua considerável contribuição ao valor dos produtos. Devido a varias das suas propriedades metabóllcas, as bacterias ácido lácticas desempenham um papel importante na industria alimentar, pela sua contribulção significante ao sabor, cheiro, textura, características sensoriais, propriedades terapêuticas e valor nutrlcional dos produtos alimentar. Este grupo está constituido de um número de gêneros incluindo Lactococcus, Lactobaclllus, Enterococcus, Etreptococcus, Leuconostoc e Pediococcus. Alguns dos metabolltos produzidos por este tipo de bacterias são ácidos orgãnicos, sustãncias preservadoras, poli-sacáridos, vitaminas, adoçantes, cheiros e sabores entre outros. Esta revisão se enfoca em estudar a importãncia das bacterias ácido lácticas nos alimentos.Lactic acid bacteria have been important in food for centuries for their significant contribution to product value. Because several of its metabolic properties, lactic acid bacteria play an important role in the food

  11. Utilisation of chlorine-dioxide and peracetic acid as disinfectants of effluents from Bologna waste water treatment plant; Sperimentazione di tecniche di disinfezione mediante biossido di cloro e acido peracetico applicate alle acque reflue dell'impianto di trattamento della citta' di Bologna

    Energy Technology Data Exchange (ETDEWEB)

    Mancini, M.L. [Bologna Univ., Bologna (Italy). Dipt. di Ingegneria delle Strutture, dei Trasporti, delle Acque, del Rilevamento e del Territorio; Sorrentino, M.

    2000-01-01

    The necessity to optimize the disinfection phase in the treatment plant of waste water of Bologna made possible an experimental survey about the efficacy of two disinfectant agents utilized: chlorine-dioxide and peracetic acid. Object of the survey is to verify the possibility of utilize, full scale, also peracetic acid as disinfection agent. The experimentation regarded the reals flows adduced and discharged from the plant and it may be an useful reference to verify performance of post-treatment constructed wetlands. Particularly it has been possible to assay the efficacy of the different treatment in waste water with residual concentrations of suspended solids. [Italian] La necessita' di ottimizzare la fase di disinfezione nell'impianto di trattamento acque reflue della citta' di Bologna, sia per il miglioramento delle rese di inattivazione, sia per la riduzione dei costi di esercizio, ha reso necessaria un'indagine sperimentale sull'efficacia di due agenti disinfettanti utilizzati: il biossido di cloro e l'acido peracetico. Scopo dell'indagine e' quello di verificare la possibilita' di impiegare, a scala reale, per il refluo tipico dell'impianto di Bologna, anche l'acido peracetico quale agente di disinfezione. La sperimentazione, condotta ha interessato le portate reali addotte e scaricate dall'impianto e puo' costituire un riferimento utile verificare la fattibilita' igienico-sanitaria di post-trattamenti di lagunaggio o fertirrigazione. In particolare si e' potuta saggiare l'efficacia dei diversi sistemi di trattamento sui reflui aventi concentrazioni residue non trascurabili di solidi sospesi.

  12. Determinación del acido abscisico en papa (Solanum sp. como respuesta a bajas temperaturas Abscisic acid determination in potato (Solanum sp. as a response to low temperature

    Directory of Open Access Journals (Sweden)

    Ortiz Luz Yineth

    2001-12-01

    Full Text Available En Colombia, existen importantes áreas con amplio potencial
    agrícola, las cuales presentan restricciones ambientales para su utilización durante determinadas épocas del año, a causa de las heladas que provocan las bajas temperaturas. Éste es el caso del Altiplano Cundiboyasence, en el cual el fenómeno en mención afecta, drásticamente, los cultivos hasta ocasionar disminución del rendimiento o perdidas totales. El presente trabajo tuvo como finalidad detectar la presencia de Acido Abscísico (ABA en las siguientes variedades de papa de la especie Solanum sp.: 'Capiro', 'Única', 'Chitagá', 'Morita', 'Pastusa', 'ICA-Zipa' y 'Nativa' (silvestre. El análisis se hizo en el estadio de prefloración bajo condiciones de temperatura ambiente (-20°C y expuestas a una simulación de helada (-4°C. Para la extracción de ABA, se recolectaron hojas del tercio superior de la planta y se sometieron a extracción Líquido-Líquido y, para su cuantificación, se utilizó el bioensayo de la inhibición del coleóptilo de trigo (Triticun tensa vulgare L., el cual se realizó por cromatografía de capa fina. Entre las variedades estudiadas, se obtuvieron dos grupos de respuesta: susceptibles y tolerantes, las cuales están asociadas con la posible ausencia o presencia de ABA. En las variedades 'ICA-Zipa' y 'Chitagá' no se detectó la presencia de ABA, como tampoco, se observó tolerancia a las bajas temperaturas. En las variedades 'Capiro', 'Pastusa', 'Nativa', 'Única' y 'Morita', se observó mayor tolerancia a las bajas temperaturas.
    There are many important geographical areas in Colombia with a high agricultural potential. They have environmental
    constrains, however, to be used in certain periods during the
    year because of the low temperature. This happens in the
    Cundiboyasence plateau, in which, this phenomenon affects
    dramatically the growing of potato crops up to the point of
    causing a decrease in production or

  13. Suplementação com ácido linoléico conjugado: estabilidade oxidativa dos suplementos e correlações com conteúdo dos lípides totais hepáticos e indicadores da oxidação dos lípides biológicos de ratos Wistar Conjugated linoleic acid supplementation: oxidative stability of supplements and correlations with total hepatic lipid contents and biological lipid oxidation indicators in Wistar rats

    Directory of Open Access Journals (Sweden)

    Lilia Ferreira Santos-Zago

    2009-02-01

    Full Text Available OBJETIVO:O objetivo do trabalho foi avaliar a estabilidade oxidativa de misturas comerciais de ácido linoléico conjugado e buscar possível correlação entre a suplementação e o conteúdo total de lípides hepáticos, e também de alguns indicadores da oxidação lipídica em ratos. MÉTODOS:Um ensaio biológico com 30 ratos divididos em três grupos (n=10 caracterizando os grupos controle e suplementados com as misturas comerciais AdvantEdge® e One® foi realizado. A concentração administrada foi de 2% em relação ao consumo de dieta e os animais foram suplementados durante 42 dias. O conteúdo total de lípides do fígado foi determinado e a morfologia do órgão foi examinada por meio de microscopia ótica. Índice de peróxido e malondialdeído foram determinados para avaliar a estabilidade oxidativa dos suplementos in vitro. Índice de peróxido, malondialdeído, 8-iso-PGF2α isoprostana e catalase foram determinados como indicadores da oxidação dos lípides biológicos. RESULTADOS: Os resultados demonstraram baixa estabilidade das misturas comerciais à oxidação in vitro. As associações entre o consumo de ácido linoléico conjugado e malondialdeído (r=-0,7914, pOBJECTIVE:The claimed action of conjugated linoleic acid as an antioxidant is unexpected and unclear, in view of its chemical structure - a conjugated diene, i.e., a fatty acid in its initial stage of autoxidation. Indeed, it can be speculated that it could act as a pro-oxidant, increasing oxidative stress in biological systems, nevertheless it has carbon-carbon bonds in the trans configuration. The objective of the present work was to evaluate the oxidative stability of commercial mixtures, and to investigate a possible correlation between conjugated linoleic acid supplementation and total hepatic lipid content, as well as some lipid oxidation indicators in rats. METHODS:A biological assay was done with thirty rats divided into three groups (n=10 characterized as

  14. Efeito da suplementação com ácido linoléico conjugado e do treinamento em natação sobre a composição corporal e os parâmetros bioquímicos de ratos Wistar em crescimento Effect of conjugated linoleic acid supplementation and swimming training on the body composition and biochemical parameters of Wistar pups

    Directory of Open Access Journals (Sweden)

    Antonio Eduardo de Aquino Junior

    2009-08-01

    Full Text Available OBJETIVO: Avaliar os efeitos da suplementação com ácido linoléico conjugado, associada ao treinamento moderado em natação, sobre a composição corporal, o consumo e a eficiência alimentar, a glicemia, o perfil lipídico e o glicogênio muscular e hepático de ratos Wistar. MÉTODOS: Ratos Wistar (30 dias foram divididos em: sedentário, sedentário suplementado, treinado e treinado suplementado. Permaneceram em gaiolas individuais com comida e água ad libitum, temperatura de 23ºC (com variação de1ºC e ciclo claro-escuro de 12 horas, durante 8 semanas. A sessão de natação durou 1 hora e foi realizada três vezes/semana, bem como a suplementação com ácido linoléico conjugado a 2%. Após sacrifício, o plasma, os tecidos adiposos brancos e o marrom, o músculo gastrocnêmio e o fígado foram coletados e pesados. RESULTADOS: A suplementação per se não promoveu modificação na ingestão alimentar e na massa corporal dos animais. Houve aumento na glicemia de jejum (pOBJECTIVE: The objective of this study was to evaluate the effects of conjugated linoleic acid supplementation associated with moderate swimming training on body composition, food efficiency and consumption, blood glucose, lipid profile, and muscle and liver glycogen of Wistar rats. METHODS: Thirty-day old Wistar rats were divided into the following groups: inactive, inactive with 2% conjugated linoleic acid supplementation, active, and active with 2% conjugated linoleic acid supplementation. They remained in individual cages with food and water ad libitum, temperature of 23±1ºC and a light and dark cycle of 12 hours for 8 weeks. The active groups swam for one hour three times per week. The animals were killed and the plasma, white and brown fat tissues, gastrocnemius muscle and liver were collected and weighted. RESULTS: Supplementation per se did not promote food intake or body weight changes in the animals. Fasting glucose (p<0.05 and high density lipoproteins

  15. Acido vainillin mandelico, disonancia cognoscitiva y autoevaluacion

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    Angel Rodriguez Kauth

    1976-01-01

    Full Text Available An. esperíment waa performed in arder to ltudy the rdationlhip among cogititive dillOnance. lelf-evaluation. and excretiOft of VáinllUn liJandelicadd. Subjetetl were 90 Itudentl with no training in lOdal pl Cho- 1081. A lICIl1eof Idf·evahiation wu applled. and IUbjecu placed in grou~ according to higb. medium or lowlCOreI. A IIgnificant difference wu found: IUbjectl with hígher ICOreI in Idf-evaluation ae:ted lO lOive the cognitive dissonance, and had differcntial excretion rates in the acid.

  16. EFECTO DE DIETAS CON ÁCIDOS GRASOS POLIINSATURADOS EN LAS PROPIEDADES SENSORIALES DE LA CARNE DE CERDO

    OpenAIRE

    Jarumi Aguilar-Guggembuhl; Daniel Mota-Rojas; Héctor Escalona-Buendía; M. Elena Trujillo-Ortega; Isabel Guerrero-Legarreta

    2014-01-01

    El consumo de algunos ácidos grasos poliinsaturados de ca - dena larga (AGPCL), en particular los ácidos docosahexa - noico (ADH), eicosapentanoico (AEP) y linoleico conjugado (ALC), es benéfico para la salud humana, por lo cual su in - corporación a la carne de abasto le da un valor agregado, pero las características sensoriales podrían alterarse ocasionando el rechazo del consumidor. El objetivo del presente estudio fue evaluar el efecto de adicionar estos tres AGPCL a la dieta de cerdos en...

  17. Obtención de Leche Entera sin Colesterol Mediante el Uso de Beta-ciclodextrina

    OpenAIRE

    Rozycki, Sergio Darío; Colombatti, Francisco; Spotti, Maria Julia; Costa, Fabiano Freire; Lazzaroni, Sandra María Sol; Pavón, Yanina Lorena

    2017-01-01

    El colesterol dietario, asociado a dicha grasa, determina en un 20% la concentración del colesterol plasmático, el cual produce enfermedades coronarias y cerebrovasculares. Este porcentaje suele promover hipercolesterolemia, siendo grasa láctea muy rica en vitamina D, ácido linoleico conjugado y promotora de características texturales (cremosidad, palatabilidad) y de flavor irreemplazables, considerándose actualmente sus ácidos grasos saturados, neutros en cuanto a la generación de enfermedad...

  18. Obtenção de leite integral sem colesterol com a utilização de β-cyclodextrina

    OpenAIRE

    Sergio Rozyck; Francisco Colombatti,; María Julia Spotti; Fabiano Freire Costa; Sandra Lazzaroni; Yanina Pavón

    2013-01-01

    El colesterol dietario, asociado a dicha grasa, determina en un 20% la concentración del colesterol plasmático, el cual produce enfermedades coronarias y cerebrovasculares. Este porcentaje suele promover hipercolesterolemia, siendo grasa láctea muy rica en vitamina D, ácido linoleico conjugado y promotora de características texturales (cremosidad, palatabilidad) y de flavor irreemplazables, considerándose actualmente sus ácidos grasos saturados, neutros en cuanto a la generación de enfermedad...

  19. Modificación de la composición de la grasa de la leche mediante pastoreo

    OpenAIRE

    Vicente, Fernando

    2016-01-01

    La formulación de la dieta es un factor determinante en la toma de nutrientes con efectos favorables en la prevención y control de enfermedades. La ingestión excesiva de lípidos ha estado relacionada tradicionalmente con el incremento en la obesidad y las enfermedades cardiovasculares, lo que ha motivado su limitación en la dieta. Sin embargo, existen efectos positivos de la grasa de la leche sobre la salud humana, principalmente atribuidos al ácido linoleico conjugado (CLA) y a los ácidos Om...

  20. COMPARACIÓN DEL CONTENIDO DE ÁCIDOS GRASOS EN QUESO ARTESANAL TEPEQUE PRODUCIDO EN UN SISTEMA SILVOPASTORIL Y UN SISTEMA TRADICIONAL DE MICHOACÁN, MÉXICO

    OpenAIRE

    Praga Ayala, Ana Rosa

    2015-01-01

    El contenido de ácidos grasos en la leche y sus derivados ha sido ampliamente investigado para obtener una mayor comprensión de sus efectos sobre la salud humana. De acuerdo con diversos autores como Bauman et al., (2001), Loor et al., (2005), Stanton et al., (2003), los niveles más altos de ácido linoleico conjugado (CLA, por sus siglas en inglés) en la grasa de la leche de vaca se han observado cuando las vacas son alimentadas con pastos frescos, dietas orgánicas y dietas suplementadas con ...

  1. Obtenção de leite integral sem colesterol com a utilização de β-cyclodextrina

    OpenAIRE

    Sergio Rozyck; Francisco Colombatti,; María Julia Spotti; Fabiano Freire Costa; Sandra Lazzaroni; Yanina Pavón

    2013-01-01

    El colesterol dietario, asociado a dicha grasa, determina en un 20% la concentración del colesterol plasmático, el cual produce enfermedades coronarias y cerebrovasculares. Este porcentaje suele promover hipercolesterolemia, siendo grasa láctea muy rica en vitamina D, ácido linoleico conjugado y promotora de características texturales (cremosidad, palatabilidad) y de flavor irreemplazables, considerándose actualmente sus ácidos grasos saturados, neutros en cuanto a la generación de enfermedad...

  2. Evaluación del perfil de ácidos grasos de carne de vacuno mediante espectroscopia MIR

    OpenAIRE

    2015-01-01

    El objetivo de este trabajo de fin de carrera es la evaluación del perfil de ácidos grasos de la carne de vacuno, con especial atención a los de interés nutricional (ácido linoleico conjugado, CLA por sus siglas en inglés, y lino) en carne y grasa intramuscular de ternero frisón mediante espectroscopia de infrarrojo medio (MIR por sus siglas en inglés). Para la realización de este trabajo se han empleado muestras de 24 terneros frisones. Estas muestras se encuentras dividida...

  3. Impact on mormortality of o one conjugated treatment in 10 paraquat intoxicated patients attended at the San Vicente de Paul University Hospital in Medellín, Colombia, from august 2002 to august 2003 Impacto en la mortalidad de un tratamiento conjugado, en pacientes intoxicados no ocupacionalmente, con paraquat en el Hospital Universitario San Vicente de Paúl de Medellín, entre agosto de 2002 y agosto de 2003

    Directory of Open Access Journals (Sweden)

    Luz Marina Quiceno Quiceno

    2004-01-01

    Full Text Available Paraquat is a frequently used herbicide in Colombia. Its ingestion produces a severe intoxication with a high lethality. Up to now there is not a successful treatment for it. The purpose of this study was to determine if a conjugated treatment with NAcetylcysteine; A, C, and E vitamins, Propranolol, Colchicine and Furosemide increased the survival of ten paraquat intoxicated patients attended at the San Vicente de Paul University Hospital in Medellín, Colombia, based on the predicted probability of survival, Paraquat plasmatic concentration and clinical assessment. Six patients died because of their intoxication severity, three of them due to multisystemic organic failure, and three from acute respiratory failure. The results had statistical significance, showing a direct proportion between the high plasma levels of paraquat and mortality; and the fact that those with a multiorganic involvement died, despite their low Paraquat plasma levels. Based on clinical data it is possible to conclude that the treatment is useful only for patients with mild to moderate intoxication; there is not an exact correlation between the clinical features and the Paraquat plasma levels; and the clinical features are a very good indicator of the prognosis in Paraquat intoxicated patients. Further experimental and clinical trials are needed. En Colombia se utiliza frecuentemente el Paraquat, herbicida que al ser ingerido en cualquier cantidad produce toxicidad grave y alta mortalidad, sin haberse encontrado un tratamiento eficaz para la recuperación de los intoxicados. El objetivo de este estudio fue establecer si un tratamiento conjugado con N-acetilcisteína, vitamina A, C, E, propranolol, colchicina y furosemida, disminuye la mortalidad en pacientes, basados en la probabilidad de supervivencia, los niveles plasmáticos y el seguimiento clínico. Resultados: De diez pacientes con intoxicaciones no ocupacionales que ingresaron al Hospital Universitario San Vicente

  4. Perfil de ácidos graxos e conteúdo de ácido linoléico conjugado no leite de vacas alimentadas com a combinação de óleo de soja e fontes de carboidratos na dieta Milk fatty acid profile and milk conjugated linoleic acid content of dairy cows fed diets with different carbohydrate sources with or without soybean oil supplementation

    Directory of Open Access Journals (Sweden)

    Eduardo da Costa Eifert

    2006-08-01

    Full Text Available A gordura do leite de 12 vacas lactantes 7/8 Holandês-Gir foi utilizada para avaliar o efeito de diferentes dietas sobre o perfil dos ácidos graxos (AG e o conteúdo de ácido linoléico conjugado (CLA no leite. Os tratamentos consistiram de concentrados formulados com milho (MI ou sua total substituição por farelo de trigo (FT ou por polpa cítrica (PC, associados ou não a óleo de soja (0 e 2,25%. A análise cromatográfica indicou que mais de 95% dos ácidos graxos (AG foram recuperados. Não foi verificada interação significativa da presença de óleo e fonte de carboidratos em qualquer variável avaliada, à exceção das concentrações de trans-10 C18:1 e da proporção de trans-10 C18:1 e trans-11 C18:1 nos totais trans- C18:1 do leite. A fonte de carboidrato utilizada não influenciou o perfil de ácidos graxos do leite ou o teor de CLA. A inclusão de óleo de soja aumentou em 35% os AG insaturados do leite e reduziu em 14% os AG saturados, principalmente os de cadeia curta (9,66 vs 7,59 g/100 g e os de cadeia média (51,80 vs 40,86 g/100 g. As dietas com óleo promoveram aumento dos AG de cadeia longa (32,17 vs 46,47 g/100 g, principalmente C18:0 (9,44 vs 13,63 g/100 g, C18:1 (20,28 vs 29,74 g/100 g e C18:2 (2,16 vs 2,92 g/100 g. A concentração de CLA cis-9 trans-11 C18:2 foi aumentada em 230% (0,46 vs 1,06 g/100 g na presença de óleo. A concentração dos AG cis e trans-C18:1 também foi aumentada; trans-11 C18:1 foi o principal isômero trans, embora a concentração de trans-10 C18:1 tenha se elevado de 0,28 para 1,11 g/100 g na presença de óleo, sendo influenciada pela fonte de carboidrato. Os tratamentos MI, FT e PC resultaram em conteúdos deste isômero semelhantes na gordura do leite, mas, na presença de óleo, as fontes MI e FT proporcionaram valores muito superiores aos obtidos com PC, indicando diferentes rotas de biohidrogenação.Milk fat from 12 7/8 crossbred Holstein-Zebu lactating dairy cows was used to

  5. Registro Nazionale Malattie Rare: malformazioni congenite e acido folico

    OpenAIRE

    Pierini, Anna; Bianchi, Fabrizio; Salerno, Paolo; Taruscio, Domenica

    2006-01-01

    It is estimated that in Italy at least 3% of babies are born with some congenital malformation. Scientific evidence demonstrates that the intake of folic acid by a woman prior the conception and during the early stages of pregnancy plays a role in preventing neural tube defects and severe birth anomalies due to the lack of neural tube closure at either the upper or lower end during the third and fourth week of pregnancy. The intake of folic acid during the periconception period can reduce the...

  6. Acidos y ésteres diterpenicos de Mikania banisteriae

    Directory of Open Access Journals (Sweden)

    Cecilia Espitia de Pérez

    2010-10-01

    Full Text Available De la fracción soluble en diclorometano, del extracto etanólico de la parte aérea de Mikania banisteriae se aislaron y purificaron por métodos cromatográficos cinco compuestos cuyas estructuras fueron determinadas por métodos espectroscópicos. Las estructuras aisladas corresponden a los ácidos kaurénico y grandiflórico y a tres esteres: benzoato, cinamato e isobutirato del ácido grandiflórico. Estos resultados contrastan con los obtenidos previamente para la misma especie, procedente de diferente zona geográfica, de la cual se aislaron otros diterpenos derivados del kaurano.

  7. Diabetic acido-ketosis revealing thiamine-responsive megaloblastic anemia.

    Science.gov (United States)

    Bouyahia, O; Ouderni, M; Ben Mansour, F; Matoussi, N; Khaldi, F

    2009-12-01

    Thiamine-responsive megaloblastic anemia (TRMA) is a rare autosomal recessive disorder characterized by megaloblastic anemia, diabetes mellitus and progressive sensorineural deafness. We report the cases of two infants, aged 4 and 5 months, hospitalized for diabetic ketoacidosis requiring insulin therapy. Laboratory tests revealed megaloblasic anemia, thrombocytopenia and normal thiamine level. Neurosensorial investigations showed bilateral deafness and ophthalmic involvement. Treatment with oral thiamine normalized hematological disorders and controlled diabetes; however, thiamine therapy had no impact on neurosensorial disorders.

  8. Acidos graso de Prochilodus lineatus (Val.) (Pisces, Curimatidae)

    OpenAIRE

    Bayo, V.; Cordiviola de Yuan, E.

    1992-01-01

    Les acides gras des dépots graisseux du mésenlère de #Prochilodus lineatus$ ont été analysés pour saisons (été et hiver). Les poissons étudiés ont été capturés dans le cours principal du Parana moyen (Argentine). Les acides les plus importants sont l'acide oléique (18:1) avec 27,15%, l'acide palmitique (16:6) avec 23,99% et l'acide palmitoleique (16:1) avec 13,90%. Ces acides sont plus abondants en hiver. Les acides supérieurs (en carbone et en insaturation) sont moins abondants en hiver (16,...

  9. Efeito dos Estrógenos Conjugados e da Medroxiprogesterona sobre a Mama: Estudo Experimental

    OpenAIRE

    Santos Luciana de Oliveira Marques dos; Biondo-Simões Maria de Lourdes Pessole; Ioshii Sérgio Ossamu

    2001-01-01

    Objetivo: avaliar no tecido mamário a influência de drogas empregadas na terapia de reposição hormonal sobre a proliferação celular, a quantidade de colágeno e de fibras elásticas e as alterações histológicas gerais do parênquima. Método: utilizaram-se 61 ratas Wistar-UFPR, adultas, divididas em 5 grupos. O grupo padrão (n=12) representou o perfil hormonal ovariano normal. As 49 ratas restantes foram ooforectomizadas e a partir do 96º dia P.O. receberam a medicação designada para cada grupo d...

  10. Nuevos sistemas ¿-conjugados basados en ensamblajes rilenimida-pirazina

    OpenAIRE

    Echegaray Carrera, Paula de

    2017-01-01

    Tesis Doctoral leída en la Universidad Rey Juan Carlos de Madrid en 2017. Directores de la Tesis: María del Mar Ramos Gallego y José Luis Segura Castedo Desde finales del siglo pasado los semiconductores orgánicos han sido ampliamente estudiados como alternativa de los semiconductores inorgánicos más habituales. Entre otros, los motivos más importantes por los que la investigación en el campo de los semiconductores orgánicos está alcanzando tanto interés y suponen un reto en...

  11. LACTIC ACID BACTERIA WITH ANTIMICROBIAL ACTIVITY AGAINST PATHOGENIC AGENT CAUSING OF BOVINE MASTITIS BACTERIAS ACIDO LACTICAS CON ACTIVIDAD ANTIMICROBIANA CONTRA PATÓGENOS CAUSANTES DE MASTITIS BOVINA OUT BACTÉRIAS LÁTICAS COM ATIVIDADE ANTIMICROBIANA CONTRA OUT PATÓGENOS DA MASTITE BOVINA

    Directory of Open Access Journals (Sweden)

    LILIANA SERNA C

    2011-06-01

    Full Text Available The use of antibiotics to treat bovine mastitis, produces antibiotic residues in milk and decreased quality of dairy products. Lactic acid bacteria have been proposed as an alternative to avoid the use of antibiotics. This paper reports the antimicrobial activity against pathogens responsible of bovine mastitis, of 4 lactic acid strains isolated from cattle in a state of acidosis ruminal. It also evaluated the specific growth rate (m and antimicrobial activity of one of the strains, using two concentrations of carbon source (20 and 60 gl-1 in the commercial substrate MRS. The strains were biochemically identified as Lactobacillus acidophilus, Lactobacillus brevis, Lactobacillus fermen-tum and Weissella confusa. Weissella confusa showed the best antimicrobial activity against the major pathogens responsible of bovine mastitis. When has been used 60 gl-1 of total sugars in the fermentation substrate, was obtained diameter of inhibition of 31 mm for Staphylococcus aureus and 36 mm for Streptococcus agalactiae. The antimicrobial activity of Weissella confusa is superior antimicrobial activity reported by many other lactic acid bacteria, therefore Weissella confusa could potentially be used to prevent bovine mastitis.El uso de antibióticos para el tratamiento de mastitis bovina, genera residuos de antibióticos en la leche y disminuye la calidad de los subproductos lácteos. Las bacterias ácido lácticas se han propuesto como una alternativa para evitar el uso de antibióticos. En este artículo se reporta la actividad antimicrobiana contra patógenos productores de mastitis bovina, de 4 cepas acido lácticas aisladas de bovinos en estado de acidosis ruminal. Se evaluó además la velocidad especifica de crecimiento (m y la actividad antimicrobiana de una de las cepas, utilizando dos concentraciones de fuente de carbono (20 y 60 gl-1 en el sustrato comercial MRS. Las cepas se identificaron bioquímicamente como Lactobacillus acidophilus

  12. Periferias e territórios sob efeitos conjugados da precarização: algumas tendências

    Directory of Open Access Journals (Sweden)

    Iracema Brandão Guimarães

    Full Text Available O artigo discute alguns aspectos do mundo do trabalho, considerando-o como dimensão estruturante da vida social e buscando perceber o modo como acarreta e reproduz seus efeitos de modo mais amplo. A desregulamentação do trabalho e dos direitos correspondentes, desencadeada no Brasil a partir dos anos oitenta, tornou os trabalhadores mais dependentes de políticas assistenciais e, mais especialmente, dos processos de integração primária, "proteção próxima" e vínculos, sugerindo indagar-se até que ponto esses últimos constituem ainda, prioritariamente, os elementos-chave da reprodução nos setores urbanos das periferias. Demonstra-se a existência de mudanças significativas que incidem sobre a relação família-comunidade, situada no eixo da integração primária, e discutem-se alguns dos seus efeitos e alcances efetivos com base nas teses que problematizam tais temas. O artigo prossegue com questões teóricas e metodológicas e, complementarmente, recorre a dados empíricos a fim de exemplificar alguns desses efeitos e alcances, abordando-os através da noção de territórios de precariedade situados entre a população de trabalhadores e não-trabalhadores residentes em bairros periféricos de Salvador, Bahia.

  13. Modelos para dispersão Raman em polímeros conjugados Raman dispersion models in conjugated polymers

    Directory of Open Access Journals (Sweden)

    Ricardo P. Millen

    2005-03-01

    Full Text Available Raman dispersion refers to the dependence of the position of Raman bands on the energy of the exciting radiation. In this work, the three main models currently used to explain this phenomenon (Conjugated Length Model, Amplitude Mode Model and Effective Conjugation Coordinate Model are discussed. Raman dispersion is a consequence of pi electron delocalization, but each model describes in a different way how pi electron delocalization affects the position of Raman bands. Here the features, qualities and problems of the three models are highlighted.

  14. Semiconductores orgánicos pi-conjugados basados en tiofeno. Un estudio teórico

    OpenAIRE

    García-Moreno, Gregorio

    2013-01-01

    En esta memoria se expone un estudio predictivo de propiedades de transporte de carga a nivel molecular para una serie de semiconductores orgánicos basados en anillos de tiofeno (derivados del politiofeno, poli(ariletinil-tienoacenos y sistemas discóticos) haciendo uso de una metodología mecanocuántica (cálculos ab initio, DFT y semiempíricos). Los resultados aquí expuestos nos ayudarán a entender la relación estructura­ propiedad y proponer modificaciones de ...

  15. Aceites vegetales sobre ácidos grasos y producción de metano in vitro en vacas lecheras.

    Directory of Open Access Journals (Sweden)

    Esperanza Prieto-Manrique

    2016-12-01

    Full Text Available El objetivo de este trabajo fue evaluar el efecto de la adición de aceites vegetales en dietas representativas de vacas lecheras bajo pastoreo, sobre los ácidos grasos, fermentación ruminal y producción de metano in vitro. La investigación se desarrolló en el laboratorio NUTRILAB–GRICA, perteneciente a la Facultad de Ciencias Agrarias, Universidad de Antioquia, Medellín, Colombia, en agosto del 2013. Se utilizó la técnica de producción de gas in vitro. En cuatro dietas (dos de monocultivo en Cynodon plectostachyus y dos de sistema silvopastoril intensivo con Leucaena leucocephala, se evaluó la adición de tres aceites vegetales (girasol, lino y palma a nivel del 2 y 4% de la MS, en un diseño completamente al azar con arreglo factorial de 4x3x2. En todas las dietas, la suplementación con aceite de girasol aumentó el contenido de ácido linoleico (C18:2 c9,12, ácido linoleico conjugado (ALC-c9t11 y ácido transvaccénico (ATV, C18:1 t11 después de la fermentación (p0,05. Ningún aceite afectó la cinética de fermentación, pH, total de ácidos grasos volátiles (AGV, proporción de AGV, ni la producción de metano.

  16. Ácidos grasos, fermentación ruminal y producción de metano, de forrajes de silvopasturas intensivas con Leucaena.

    Directory of Open Access Journals (Sweden)

    Esperanza Prieto-Manrique

    2016-06-01

    Full Text Available El objetivo del presente trabajo fue determinar el efecto de los forrajes sobre los ácidos grasos de cadena larga, fermentación ruminal y producción de metano de un sistema silvopastoril intensivo de Leucaena leucocephala. La investigación se desarrolló en el laboratorio NUTRILAB–GRICA, perteneciente a la Facultad de Ciencias Agrarias, de la Universidad de Antioquia, Medellín–Colombia, en julio del 2013. Se utilizó la técnica de producción de gas in vitro, utilizando como sustrato de fermentación las gramíneas (C. plectostachyus y/o M. maximus cv. Tanzania y leucaena (L. leucocephala, solas o en sus combinaciones, con una relación forraje:concentrado 70:30 y gramínea: leucaena 56:14, para un total de siete tratamientos. No se encontró efecto de los forrajes (p>0,05, sobre el contenido de ácido linoleico conjugado (ALC, C18:2 c9t11 o ruménico en la digesta. La inclusión de 14% de leucaena aumentó el contenido de ácido linoleico (C18:2 c9, 12 y linolénico (C18:3 c9, 12, 15 en el alimento y de transvaccénico (ATV, C18:1 t11, esteárico (C18:0, linoleico y linolénico en la digesta (p<0,05, y no afectó la cinética de fermentación, digestibilidad de la materia seca (MS, pH, total y proporción de ácidos grasos volátiles, ni redujo la producción de metano. Las gramíneas, C. plectostachyus y M. maximus, se comportaron similar en las variables evaluadas (p>0,05. Los sistemas silvopastoriles pueden ser una opción para aumentar los ácidos grasos benéficos en la leche.

  17. Acid Deposition Maps in Spain; Mapas de Deposito Acido en Espana

    Energy Technology Data Exchange (ETDEWEB)

    Artinano, B.; Cabal, H.; Garcia, C. [CIEMAT. Madrid (Spain)

    1998-12-31

    Annual and monthly deposition velocity and total sulfur deposition maps have been performed for the peninsular Spain for 1992 by using the inferential method. To de this, updated database with high space and time resolution, for land uses (CORINE) and meteorological information from analysis modelling for the same year, have been utilized. The final result are deposition maps in a 5 x 5 km``2 grid which allow to assess the methodology used in Europe to obtain the maps of excedance over the critical loads of pollutants. (Author) 32 refs.

  18. Proteine chiave dei processi metabolici indotti dall’acido indolo-3-acetico (IAA) in Rizobio

    OpenAIRE

    2006-01-01

    I batteri del suolo gram-negativi dei generi Rhizobium, Bradyrhizobium, Azorhizobium, Mesorhizobium e Sinorhizobium, collettivamente chiamati rizobi, sono microrganismi azotofissatori simbionti delle radici delle Leguminose. Nel processo di simbiosi i rizobi inducono la divisione cellulare delle cellule corticali della radice con la formazione dei cosiddetti noduli radicali, all’interno dei quali i batteroidi, ossia i batteri differenziati, riducono l’azoto atmosferico ad ammonio (P. van Rhij...

  19. ELIMINACION DEL COLORANTE NEGRO ACIDO 194 DESDE AGUAS RESIDUALES TEXTILES MEDIANTE ELECTROCOAGULACION

    OpenAIRE

    VIDAL FUENTES, JORGE ARTURO

    2013-01-01

    Diariamente, las industrias textiles descargan grandes volúmenes de aguas que contienen altas concentraciones de colorantes y aditivos, los cuales ocasionan daños considerables al medio ambiente. Muchos de estos colorantes son estables a la luz y a la biodegradación, siendo considerados como compuestos orgánicos persistentes (COPs). Es por esto que es necesario aplicar métodos que permitan la eliminación de estos contaminantes desde las aguas. Una metodología efectiva para la eliminación de C...

  20. ESTUDIO QUIMICO-COMPUTACIONAL PARA LA INHIBICION DE LA ENZIMA ACIDO ACETOHIDROXI SINTASA POR UNA SULFONILUREA

    OpenAIRE

    JAÑA VILLALOBOS, GONZALO ALFREDO

    2010-01-01

    En el presente trabajo de tesis se ha estudiado la enzima ácido acetohidroxi sintasa (AHAS), mediante el uso de métodos químico-computacionales, como dinámica molecular y QM/MM, fundamentalmente. La AHAS es una enzima que participa en la biosintesis de aminoácidos de cadena ramificada (valina, leucina e isoleucina) en plantas, hongos y bacteria. Por lo cual, esta enzima ha sido considerada como el principal blanco de acción de herbicidas.

  1. ESTUDIO QUIMICO-COMPUTACIONAL PARA LA INHIBICION DE LA ENZIMA ACIDO ACETOHIDROXI SINTASA POR UNA SULFONILUREA

    OpenAIRE

    JAÑA VILLALOBOS; GONZALO ALFREDO

    2010-01-01

    En el presente trabajo de tesis se ha estudiado la enzima ácido acetohidroxi sintasa (AHAS) , mediante el uso de métodos químico-computacionales, como dinámica molecular y QM/ MM, fundamentalmente. La AHAS es una enzima que participa en la biosíntesis de aminoácidos de cadena ramificada (valina, leucina e isoleucina) en plantas, hongos y bacteria. Por lo cual, esta enzima ha sido considerada como el principal blanco de acción de herbicidas. En el presente trabajo de tesis se ha...

  2. Isolation of deoxyribonucleic acids (A Review); Aislamiento de los acidos desoxiribonucleicos. Revision Bibliografica

    Energy Technology Data Exchange (ETDEWEB)

    Garcia de Pineda, M. de

    1974-07-01

    The criteria of choice in this Review have been to gather some of the last advances in the methodology of DNAs isolation; also the description of the generally accepted procedures has been emphasized. Only papers published before March 1974 are reviewed, because this work has been finished during this month. (Author) 109 refs.

  3. Quantification of uranyl in presence of citric acid; Cuantificacion de uranilo en presencia de acido citrico

    Energy Technology Data Exchange (ETDEWEB)

    Garcia G, N.; Barrera D, C.E. [UAEM, Facultad de Quimica, 50000 Toluca, Estado de Mexico (Mexico); Ordonez R, E. [ININ, 52750 La Marquesa, Estado de Mexico (Mexico)]. e-mail: nidgg@yahoo.com.mx

    2007-07-01

    To determine the influence that has the organic matter of the soil on the uranyl sorption on some solids is necessary to have a detection technique and quantification of uranyl that it is reliable and sufficiently quick in the obtaining of results. For that in this work, it intends to carry out the uranyl quantification in presence of citric acid modifying the Fluorescence induced by UV-Vis radiation technique. Since the uranyl ion is very sensitive to the medium that contains it, (speciation, pH, ionic forces, etc.) it was necessary to develop an analysis technique that stands out the fluorescence of uranyl ion avoiding the out one that produce the organic acids. (Author)

  4. Terpenes and fatty acids from Dipteryx lacunifera Ducke; Terpenos e acidos graxos de Dipteryx lacunifera Ducke

    Energy Technology Data Exchange (ETDEWEB)

    Vieira Junior, Gerardo Magela; Silva, Hilris Rocha e; Bittencourt, Thais Chaves; Chaves, Mariana H. [Universidade Federal do Piaui (UFPI), Teresina (Brazil). Dept. de Quimica]. E-mail: mariana@ufpi.br; Simone, Carlos Alberto de [Universidade Federal do Alagoas (UFAL), Maceio, AL (Brazil). Inst. de Quimica e Biotecnologia

    2007-07-01

    This paper describes the isolation of the furanocassane-type diterpene, named vinhaticoic acid, along with b-farnesene and spatulenol from fruit shells of D. lacunifera. Structural determinations were accomplished by chemical derivatization and spectral analysis, including 1D and 2D NMR and X-ray crystallography. The fatty portion was extracted from the fruit kernels, transesterfied and analysed by HRGC/MS. Oleic acid (75.8 +- 4.3%) was the major component. Essential oil extracted from the fruit shells of D. lacunifera was analysed by HRGC/MS and nine sesquiterpenes were identified; beta-farnesene (48.6%) and spatulenol (21.61%) were the major constituents. (author)

  5. Acid Deposition Maps in Spain; Mapas de Deposito Acido en Espana

    Energy Technology Data Exchange (ETDEWEB)

    Artinano, B.; Cabal, H.; Garcia, C.

    1998-07-01

    Animal and monthly deposition velocity and total sulfur deposition maps have been performed for the peninsular Spain for 1992 by using the inferential method. To do this, updated databases with high space and time resolution, for land uses (CORINE) and meteorological information from analysis modelling for the same year, have been utilized. The final result are deposition maps in a 5x5 Km{sup 2} grid which allow to assess the methodology used in Europe to obtain the maps of excedances over the critical loads of pollutants. (Author) 32 refs.

  6. Acido, ergo sum: Holger Hydén--the neuroscientist in Cortázar's Hopscotch.

    Science.gov (United States)

    Delgado, Guillermo; Estañol, Bruno

    2013-06-01

    The fictional Italian author Morelli is throughout the novel "Hopscotch" (1963) Julio Cortázar's alter ego. This character proposes an unoriginal literary hypothesis in chapter 62. There is an allusion to a particular Swedish that 'is working on a chemical theory of thought.' The Swedish neuroscientist under analysis is Holger Hydén (1917-2000), by then professor and chairman of the Department of Histology at the University of Göteborg. Hydén, who was the first to work in neurobiological micromethods, is mentioned by Morelli due to his participation in a symposium held at the end of January 1961, in San Francisco. His pioneering work will never be completely forgotten, because Hydén's neuroscientific legacy lives and will live in Cortázar's "Hopscotch".

  7. Hidrolisis enzimatica del acido pectico con una endopoligalacturonasa de levadura: Cinetica y distribucion de masas moleculares

    National Research Council Canada - National Science Library

    Serrat-Diaz, Manuel; Dume-Arias, Richard A; Del-Todo-Martinez, Yuniesky; Rodriguez-Gamez, Odalys; Almenares-Verdecia, Juan F; Machado-Garcia, Roberto G

    2013-01-01

    Los oligogalacturonidos se erigen como prometedoras biomoleculas para uso agricola, en la biotecnologia vegetal y en la elaboracion de alimentos funcionales, debido a su potente y diversa actividad...

  8. Equilibrio de fases de sistemas compostos por oleos vegetais, acidos graxos e etanol hidratado.

    OpenAIRE

    Cintia Bernardo Gonçalves

    2004-01-01

    Resumo: Este trabalho de tese de doutoramento teve como objetivo avaliar vários aspectos do processo de extração líquido-líquido (ELL) como uma rota alternativa para a desacidificação de óleos vegetais. O conhecimento do equilíbrio de fases do sistema de interesse é essencial para o bom planejamento e desenvolvimento do processo de ELL. O presente trabalho apresenta dados de equilíbrio para sistemas compostos por óleos vegetais (milho/palma), ácidos graxos (oléico/ palmítico) e solvente (etan...

  9. Avaliacao da seguranca de diferentes doses de suplementos de acido folico em mulheres do Brasil

    Directory of Open Access Journals (Sweden)

    Quenia dos Santos

    2013-10-01

    Full Text Available OBJETIVO Avaliar a distribuição da ingestão de ácido fólico e a segurança de diferentes doses de suplementos em mulheres em idade reprodutiva. MÉTODOS Foram utilizados dados de consumo a partir de dois dias não consecutivos de registro alimentar de 6.837 mulheres em idade reprodutiva (19 a 40 anos participantes do Inquérito Nacional de Alimentação, módulo da Pesquisa de Orçamentos Familiares 2008-2009. Médias e percentis de consumo habitual de folato natural e ácido fólico foram estimados utilizando o método do National Cancer Institute . Cinco cenários foram simulados somando-se diferentes doses diárias de fortificação (400 mcg, 500 mcg, 600 mcg, 700 mcg e 800 mcg ao ácido fólico oriundo dos alimentos consumidos pelas mulheres. Comparou-se o total de ácido fólico (dieta + suplemento com o nível máximo de ingestão tolerável (UL = 1.000 mcg para definir a dose segura de suplementação. RESULTADOS Mulheres com ingestão habitual de ácido fólico acima do nível máximo de ingestão tolerável foram observadas para doses de suplemento de 800 mcg (7,0% das mulheres. Abaixo desse valor, qualquer dose de suplementação mostrou-se segura. CONCLUSÕES O uso de suplementos de até 700 mcg de ácido fólico mostrou-se seguro.

  10. Uso del acido etilendiaminotetraacetico para evaluar la biodisponibilidad de metales pesados en lechuga

    National Research Council Canada - National Science Library

    Cordero, Y; Guridi, F

    2009-01-01

    ...) en la extraccion de metales pesados en un suelo contaminado por residuos industriales liquidos. Para ello, se estudiaron dos disoluciones de EDTA a concentraciones de 0.025 y 0.05 mol [L.sup.-1...

  11. EFECTO DE DIFERENTES ACIDOS GRASOS SOBRE LOS MARCADORES INFLAMATORIOS EN ARTERIOSCLEROSIS EN RATON

    OpenAIRE

    TORREJON SILVA ; CLAUDIA PAOLA

    2010-01-01

    Los ácidos grasos poliinsaturados de cadena larga n-3 (AGPICL) son nutrientes esenciales que tienen una función anti-inflamatoria y disminuyen el riesgo de enfermedad cardiovascular. Esta tesis examina el efecto de AGPICL n-3 comparado los AG saturados sobre la expresión de los principales efectores moleculares que están involucrados en los procesos aterogénicos previo al desarrollo de la arteriosclerosis como enfermedad. 48 ratones machos C57BL/6 (12 semanas de edad) fueron asignados e...

  12. AUSENCIA DE BIOTOXINA ACIDO DOMOICO EN LOS PANTANOS DE VILLA CHORRILLOS, PERÚ

    OpenAIRE

    Álvarez F., Pedro P.; Centro Nacional de Control de Calidad, Instituto Nacional de Salud (Perú).; Santiago Ch., Carlos A.; Centro Nacional de Alimentación y Nutrición, Instituto Nacional de Salud (Perú).

    2006-01-01

    En el verano del 2003 se produjo un fenómeno calificado como «marea roja» en un espejo de agua de los Pantanos de Villa de Lima, Perú. Con el objetivo de explicar el posible incremento de muerte de aves acuáticas, se analizó el agua en busca de la biotoxina ácido domoico. Se obtuvo una muestra de agua de color rojo y se analizó para ácido domoico por cromatografía líquida de alta performance (HPLC). El equipo empleado fue un cromatógrafo Shimadzu modelo LC-10A, con inyector automático y detec...

  13. Aislamiento y rendimiento del GMP mediante precipitacion de lactosuero con acido tricloroacetico

    National Research Council Canada - National Science Library

    Rojas V., Evelin; Valbuena C., Emiro; Torres F., Gabriel; Garcia de H., Aiza; Pinero G., Maria; Galindo A., Luz Mila

    2009-01-01

    ...) que se libera al lactosuero. El GMP presenta una estructura quimica particular donde predominan los aminoacidos con cadena lateral ramificada, no presenta aminoacidos aromaticos y contiene carbohidratos unidos a residuos de treonina...

  14. Naphthenic acid characterization and distribution in crude oils; Caracterizacao e distribuicao de acidos naftenicos em petroleos

    Energy Technology Data Exchange (ETDEWEB)

    Guimaraes, Regina C.L.; Gomes, Alexandre de O. [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil)

    2008-07-01

    Naphthenic acid corrosion was observed for the first time during the distillation process of some kind of crude oils in 1920. Recent reports about naphthenic acid corrosion have been found in China, India, Venezuela, Eastern Europe, Russia and the USA. In Brazil, heavy and acid crude oil processing is rising. Some brazilian crude oils have TAN around 3,0 mg KOH/g. The presence of relatively high levels of naphthenic acids in crude oils is a bane of petroleum refiners; and more recently, of producers as well, who have reported problems during production with calcium and sodium naphthenate . Essentially, these acids which are found to greater or lesser extent in virtually all crude oils are corrosive and tend to cause equipment failures, lead to high maintenance costs and may pose environmental disposal problems. In order to give these information to PETROBRAS, The Research and Development Center of PETROBRAS (CENPES) has been working in house and with brazilian universities developing analytical technicians to know better molecular structures and distribution of these acids compounds in crude oils. This work presents the actual methods and some results from these developments. (author)

  15. Cementation of wastes with boric acid; Cimentacao de rejeitos contendo acido borico

    Energy Technology Data Exchange (ETDEWEB)

    Tello, Cledola C.O.; Haucz, Maria Judite A. [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN), Belo Horizonte, MG (Brazil); Alves, Lilian J.L.; Oliveira, Arno H. [Minas Gerais Univ., Belo Horizonte, MG (Brazil). Dept. de Engenharia Nuclear

    2000-07-01

    In nuclear power plants (PWR) are generated wastes, such as concentrate, which comes from the evaporation of liquid radioactive wastes, and spent resins. Both have boron in their composition. The cementation process is one of the options to solidify these wastes, but the boron has a negative effect on the setting of the cement mixture. In this paper are presented the experiments that are being carried out in order to overcome this problem and also to improve the efficiency of the process. Simulated wastes were cemented using additives (clays, admixtures etc.). In the process and product is being evaluated the effect of the amount, type and addition order of the materials. The mixtures were selected in accordance with their workability and incorporated waste. The solidified products are monolithic without free water with a good mechanical resistance. (author)

  16. Copper corrosion originated by volatile organic acid vapours; Corrosion del cobre por acidos organicos volatiles

    Energy Technology Data Exchange (ETDEWEB)

    Cano, E.; Polo, J. L.; Kong, D. Y.; Mora, E. M.; Lopez-Caballero, J. A.; Bastidas, J. M.

    2004-07-01

    The corrosion of copper in the presence of volatile organic acids is frequent. Thus, for example, it is known that failures by corrosion of the copper tubes take place in the air conditioning equipment, caused by volatile organic acids emitted by oils used in their manufacturing. Another frequent case is the corrosion of copper objects caused by the acids emitted by the materials used in packing, wood and resins, amongst others. This communication presents the corrosion results of copper exposed to 100% relative humidity and different concentrations (10-300ppm) of formic (HCOOH), acetic (CH{sub 3}COOH), propionic (CH{sub 3}CH{sub 2}COOH) and butyric (CH{sub 3}(CH{sub 2}){sub 2}COOH) acid vapours, for short exposure times. the techniques used were gravimetric analysis, scanning electron microscopy (SEM) and X-ray diffraction (XRD). (Author) 9 refs.

  17. Valutazione farmacoeconomica della prevenzione con picotamide vs acido acetilsalicilico dei pazienti diabetici con vasculopatia periferica

    Directory of Open Access Journals (Sweden)

    Sergio Iannazzo

    2005-12-01

    Full Text Available Type 2 diabetes mellitus (DM and peripheral arterial disease (PAD are two very relevant cardiovascular (CV risk factors, which can often be found concurrently in the same patient. The DAVID trial, a double-blind, randomized, aspirin(ASA-controlled study, has demonstrated that the use of picotamide, a thromboxane A2 synthase and receptor dual inhibitor, is associated with lesser CV morbidity and mortality in this type of patients in comparison to ASA, considered the standard antiplatelet agent. In order to estimate clinical and economic impacts of picotamide in the Italian health care setting, we developed a pharmacoeconomic model based on clinical data from DAVID and national economic parameters and demographics. The base case scenario, which reflects current prices and reimbursement policy (i.e. ASA fully paid for, picotamide out-of-pocket for patients yielded an incremental cost/effectiveness ratio (ICER of about 8,500 euro/year of life (YOL saved, which falls below conventionally adopted willingness to pay thresholds. This cost, however, is totally born by the patient, while the savings on health care expenditures for avoided events (and less ASA benefit the national health service (NHS. These results may help the physician in explaining the consequences of this choice to his/her patients, facilitating a fully-informed choice. The availability of a theoretical model allowed to explore some alternative scenarios, that indicate that the ICER can be further lowered and the economical burden better distributed through policy changes. In conclusion, the pharmacoeconomic model indicated that picotamide is likely to be a cost/effective option for CV mortality and morbidity prevention in patients with concurrent type 2 DM and PAD and that the level of adoption of this strategy will depend on willingness to pay and policy priorities of the NHS and patients themselves.

  18. Controle eletroquimico de acido humico e algas usando um reator com eletrodo de filme de diamante

    OpenAIRE

    Andrea Alexandra Junior

    2007-01-01

    Resumo: A presença de ácidos húmico e o crescimento de algas em água de abastecimento e de piscinas geram subprodutos que são prejudiciais à saúde. Para controlar a concentração de ácidos húmico e algas, este trabalho apresenta um processo de eletro-oxidação usando anodos de diamante dopado com boro (DDB). Neste tratamento, a solução aquosa é percolada através de um reator tipo filtro-prensa, com anodo de DDB polarizado a corrente constante. Para caracterizar a eficiência do tratamento, foram...

  19. Validation of analytical method to calculate the concentration of conjugated monoclonal antibody; Validacao de metodo analitico para calculo de concentracao de anticorpo monoclonal conjugado

    Energy Technology Data Exchange (ETDEWEB)

    Alcarde, Lais F.; Massicano, Adriana V.F.; Oliveira, Ricardo S.; Araujo, Elaine B. de, E-mail: lais_alcarde@hotmail.com [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)

    2013-07-01

    The objective of this study was to develop a quantitative analytical method using high performance liquid chromatography (HPLC) to determine the antibody concentration in conjunction with bifunctional chelator. Assays were performed using a high performance liquid chromatograph, and the following conditions were used: flow rate of 1 mL / min, 15 min run time, 0.2 M sodium phosphate buffer pH 7.0 as the mobile phase and column of molecular exclusion BioSep SEC S-3000 (300 x 7.8 mm, 5 μM - Phenomenex). The calibration curve was obtained with AcM diluted in 0.2 M sodium phosphate buffer pH 7.0 by serial dilution, yielding the concentrations: 400 μg/mL, 200 μg/mL, 100 μg/mL, 50 μg/mL, 25 μg/mL and 12.5 μg/mL. From the calibration curve calculated the equation of the line and with it the concentration of the immunoconjugate. To ensure the validity of the method accuracy and precision studies were conducted. The accuracy test consisted in the evaluation of 3 samples of known concentration, being this test performed with low concentrations (50 μg/mL), medium (100 μg/mL) and high (200 μg/mL). The precision test consisted of 3 consecutive measurements of one sample of known concentration, subject to the conditions set forth above for the other tests. The correlation coefficient of the standard curve was greater than 97%, the accuracy was satisfactory at low concentrations as well as accuracy. The method was validated by showing it for the accurate and precise determination of the concentration of the immunoconjugate. Furthermore, this assay was found to be extremely important, because using the correct mass of the protein, the radiochemical purity of the radioimmunoconjugate was above 95% in all studies.

  20. Efeitos de teores proteicos da dieta, conjugados a ação de força mecanica, sobre tecidos periodontais do molar do rato

    OpenAIRE

    Renato Salge Prata

    1991-01-01

    Resumo: Realizou-se um estudo para quantificar o deslocamento dentário e as alterações do periodonto de sustentação de dentes de animais mantidos sob dietas hiper, normo e hipo-protéicas. Para tanto foram utilizados 45 ratos (Rattus novergicus albinus,Wistar) com 21 dias de idade e pesos iniciais entre 50 e 70 gramas. Os animais após serem distribuidos em três grupos receberam o seguinte tratamento: Grupo GI - (constituido de 15 ratos) recebeu 40% de proteina na dieta (dieta hiper-protéica). ...

  1. Efeitos de teores proteicos da dieta, conjugados a ação de força mecanica, sobre tecidos periodontais do molar do rato

    OpenAIRE

    1991-01-01

    Resumo: Realizou-se um estudo para quantificar o deslocamento dentário e as alterações do periodonto de sustentação de dentes de animais mantidos sob dietas hiper, normo e hipo-protéicas. Para tanto foram utilizados 45 ratos (Rattus novergicus albinus, Wistar) com 21 dias de idade e pesos iniciais entre 50 e 70 gramas. Os animais após serem distribuidos em três grupos receberam o seguinte tratamento: Grupo GI - (constituido de 15 ratos) recebeu 40% de proteina na dieta (dieta hiper-protéic...

  2. PREPARACION Y CARACTERIZACION DE CONJUGADOS ALBUMINA-POLI(ACRILAMIDA) ESTUDIOS DE UNION DE LAS 1,4-DIHIDROPIRIDINAS A LA PROTEINA LIBRE Y CONJUGADA

    OpenAIRE

    ESPINOZA SOMMER, PAMELA YAHEL

    2011-01-01

    Las albúminas del suero están entre las proteínas más importantes del plasma sanguíneo y su función principal es el transporte y distribución de muchas sustancias, entre éstas las drogas. La unión de las drogas a las albúminas varía su concentración libre, y por lo tanto la eficiencia como fármaco. Por lo cual el conocer la afinidad de la proteína por la droga es de gran importancia. Las albúminas del suero humano (HSA) y de bovino (BSA) son proteínas formadas por una simple cadena de 585 ...

  3. Detection of biologically active isomers of conjugated linoleic acid in kaymak

    Directory of Open Access Journals (Sweden)

    Ökten, Sevtap

    2005-12-01

    Full Text Available Numerous physiological effects are attributed to conjugated linoleic acids (CLA. Biologically active isomers of CLA ( cis -9, trans -11 (C18:2 and trans- 10, cis- 12 (C18:2 have been reported to have anticarcinogenic, antioxidative and antiatherosclerotic properties. Relatively rich sources of CLA include milk fat-containing foods such as kaymak. Kaymak is a kind of concentrated cream which is traditionally manufactured from buffalo or cow's milk mainly in Turkey . The objective of this study was to determine CLA concentrations during kaymak production. Kaymak was manufactured from cow's milk which was enriched with unfermented cream. Biologically active isomers of CLA in raw milk, cream and kaymak were analyzed using gas chromatography. The method was quick, repeatable and sensitive for the CLA determination of samples. Significant differences were found among the concentrations of both isomer and total CLA during the production process (pNumerosos efectos fisiológicos se atribuyen a los ácidos linoleico conjugados (CLA. Así los isómeros biológicamente activos ( cis -9, trans -11 (C18:2 y trans- 10, cis del ácido linoleico han sido descritos con propiedades anticarcinogénicas, antioxidantes y antiarterioscleróticas. Fuentes relativamente ricas de CLA incluyen alimentos con grasas lácteas tales como el kaymak. El kaymak es una crema concentrada elaborada de leche de búfalo o vaca principalmente en Turquía. El objetivo de este estudio fue la determinación de la concentración de CLA durante la producción de kaymak. El kaymak objeto de estudio fue elaborado a partir de leche de vaca que fue enriquecida con crema no fermentada. Los isómeros biológicamente activos del CLA fueron analizados por cromatografía gaseosa en leche cruda, crema y kaymak. El método empleado fue rápido, reproducible y sensible. Se encontraron diferencias significativas en las concentraciones de ambos isómeros y de CLA total durante el proceso de producci

  4. Evaluation of the antioxidant activity of rice bran extracts using different antioxidant assays

    Directory of Open Access Journals (Sweden)

    Rehman Bajwa, Jawad -ur-

    2006-09-01

    Full Text Available In the present work the antioxidant activity of different solvent (100% methanol, 80% methanol, 100% acetone, 80% acetone extracts of rice bran was evaluated following different antioxidant assays and using sunflower oil as oxidation substrate. The rice bran extracts were evaluated from the estimate of % inhibition of peroxidation in linoleic acid system, total phenolics content (TPC and loss of β-carotene in a linoleic acid system. Additionally, crude concentrated rice bran extracts were added into the sunflower oil samples and stored under ambient conditions. The extent of oxidative deterioration was followed by the measurement of peroxide-, p-anisidine-, conjugated diene-, and triene- values. The general order of antioxidant efficacy of rice bran extracts as determined by various antioxidant assays was 80% methanolic extract > 100% methanolic  extract > 80% acetone extract > 100% acetone extract. The results of the present comprehensive analysis demonstrate that rice bran extracts of the Super Kernel variety indigenous to Pakistan are a viable source of natural antioxidants and might be exploited for functional foods and nutraceutical applications.Se evalúa la actividad antioxidante diferentes extractos (100% metanol, 80% metanol, 100% acetona and 80% acetona de salvado de arroz -var. Super Kernel- mediante diferentes ensayos y utilizando aceite de girasol como substrato. Los ensayos utilizados fueron la estimación del % de inhibición de la peroxidación en sistemas con ácido linoleico, el contenido total en compuestos fenólicos y la pérdida de β-caroteno en sistemas con ácido linoleico. Adicionalmente, los concentrados de extractos de salvado de arroz se añadieron a aceite de girasol y las muestras se almacenaron a temperatura ambiente. La extensión de la oxidación se evaluó mediante el índice de peróxidos, el índice de p-anisidina, así como la formación de dienos y trienos conjugados. El orden de la eficacia antioxidante

  5. Impacto de los ácidos grasos isoméricos Trans y CLA sobre la modulación lipídica en ratas alimentadas con dietas enriquecidas o deprivadas en ácido linoleico

    OpenAIRE

    Fariña, Ana Clara

    2015-01-01

    Fil: Fariña, Ana Clara. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; Argentina. Actualmente, el consumo excesivo de aceites ricos en ácidos grasos (AG) de la serie n-6 constituye un problema nutricional. Este desbalance coexiste con déficits de AG esenciales. Los isómeros de AG han despertado gran interés por sus potenciales efectos sobre la salud. Así, los AG trans (AGT) de origen industrial han sido asociados a efectos deletéreos. Mientras que los conju...

  6. Reducción de la biohidrogenación del ácido linoleico y alfa linolénico por la adición de diferentes proporciones de ácido eicosapentaenoico y docosahexaenoico

    Directory of Open Access Journals (Sweden)

    Julian Castillo

    2014-04-01

    Full Text Available Se evaluó el efecto de la adición de ácidodocosahexaenoicoe (DHA y eicosapentaenocio(EPA a una mezcla de ácidolinoleico (ALi y alfa-linolénico (ALn,sobre su biohidrogenación, en fluidoruminal in vitro. A 500 mg de kikuyo,se agregaron 18 μL de una mezcla deALi:ALn (75:25 (Control o una mezclade 14,9 μL ALi:ALn (75:25 con 3,1μL de una mezcla que contenía cuatrorelaciones de DHA:EPA (100:0, 75:25,25:75, 0:100. El kikuyo sin adición deácidos grasos (AG (Control negativo ocon adición de estos, fue incubado confluido ruminal por triplicado, durante 0,5 o 16 horas, en tubos de 50 mL. Loslípidos del material incubado fueron extraídos,metilados y analizados para AGpor CG-FID. Las concentraciones relativas(g/100 g AG de los AG incubados ylos principales productos de la isomerizacióny biohidrogenación se compararonmediante un modelo completamenteal azar, usando el PROC GLM de SAS.La concentración relativa de ALi y ALndisminuyó con el tiempo de incubación,pero no fue diferente entre tratamientoscon EPA y DHA a las 16 horas. La adiciónde DHA y EPA puros o en mezclasdisminuyó la concentración relativade C18:0 (P < 0,01 e incrementó la deC18:1 trans-11 (ATV (P < 0,01 y C18:2trans-11, cis-15 (P < 0,01 (ALC,mientras que los cambios en la concentraciónrelativa del C18:2 cis-9, trans-11no fueron claros. Los resultados sugieren que la acción inhibitoria del EPA y DHA ocurre en los pasos finales de la biohidrogenación del ALi y del ALn.

  7. Influencia de la alimentación con altos niveles de ácidos grasos insaturados en la calidad de la canal y de la carne de terneros sacrificados a dos niveles de acabado, linoleico, alpha linolenico,

    OpenAIRE

    Alberti Lasalle, Pere; Sañudo Astiz, Carlos; Beriáin Apesteguía, María José

    2012-01-01

    El objetivo fue evaluar el efecto de la inclusión de semilla de lino en el concentrado de terneros sobre los parámetros productivos, en el perfil de ácidos grasos de la grasa intramuscular y en la calidad sensorial y vida útil de la carne. Se utilizaron terneros de raza Pirenaica que fueron cebados con pienso control, o un pienso con un 5% de semilla de lino, o bien con lino y enriquecido con 200 UI de vitamina E, y los animales fueron faenados a dos niveles de engrasamiento. La composición d...

  8. Acido, ergo sum: Holger Hydén – the neuroscientist in Cortázar's Hopscotch Acido, ergo sum: Holger Hydén – o neurocientista em O Jogo da Amarelinha, de Cortázar

    Directory of Open Access Journals (Sweden)

    Guillermo Delgado

    2013-06-01

    Full Text Available The fictional Italian author Morelli is throughout the novel “Hopscotch” (1963 Julio Cortázar's alter ego. This character proposes an unoriginal literary hypothesis in chapter 62. There is an allusion to a particular Swedish that ‘is working on a chemical theory of thought.’ The Swedish neuroscientist under analysis is Holger Hydén (1917-2000, by then professor and chairman of the Department of Histology at the University of Göteborg. Hydén, who was the first to work in neurobiological micromethods, is mentioned by Morelli due to his participation in a symposium held at the end of January 1961, in San Francisco. His pioneering work will never be completely forgotten, because Hydén's neuroscientific legacy lives and will live in Cortázar's “Hopscotch”.O autor italiano de ficção Morelli atua, no romance “Jogo da Amarelinha” (1963, como o alter ego de Julio Cortázar. Este personagem propõe uma hipótese literária sem originalidade no capítulo 62. Há uma alusão a um sueco em particular que “está trabalhando em uma teoria química do pensamento”. O neurocientista sueco em questão é Holger Hydén (1917-2000, então professor e diretor do Departamento de Histologia da Universidade de Gotemburgo. Hydén, que foi o primeiro no uso de métodos para a microdissecção de neurônios individuais, é mencionado por Morelli devido a sua participação em um simpósio realizado em São Francisco, no final de janeiro de 1961. Seu trabalho pioneiro nunca será esquecido completamente porque seu legado neurocientífico vive e vai viver em “Jogo da Amarelinha”, de Cortázar.

  9. Acid—base behavior of aluminum and silicon oxides — a combination of two approaches: XPS and Lewis acido-basicity; rest potential and Brönsted acido-basicity

    Science.gov (United States)

    Casamassima, M.; Darque-Ceretti, E.; Etcheberry, A.; Aucouturier, M.

    1991-11-01

    In the frame of an investigation on adhesion phenomena between elastomers and oxide substrates, X-ray photoelectron spectroscopy (XPS) and rest electrochemical potential measurements have been used in order to attempt a characterization of the reactivity of various oxides. The first step of the study is a definition of donor/acceptor properties for a solid surface in an interactive model such as the Lewis one. In this case, the Fermi level is an appropriate parameter. An experimental approach is developed to estimate this parameter through photoelectronical data obtained by XPS. As proposed by Mullins and Averbach in 1988 in the case of Al and Si oxides, XPS allows an estimation of the Fermi energy EF, defined as the energy difference between the Fermi level and the upper occupied valence band. A classification of EF values is obtained for different samples of aluminum and silicon oxides; the donor (acceptor) behavior increases for decreasing (increasing) EF. The second step is the validation of the EF classification obtained by XPS. A potentiometric method is used to estimate the rest potential Eo in aqueous solution. The relationship between the Eo and the solution pH is a Nernst law for a large range of pH values, which means that the system is governed by acid-base interactions in Brönsted definition in the interfacial area. When the nature of the oxide substrate is modified, the translation of the Eo versus pH line can be correlated with the EF classification obtained previously. This confirms the relationship already reported between point of zero charge and EF. It can also be considered as a validation of the idea that XPS allows the classification of EF values for those oxides.

  10. Uranium accumulation in Brassica rapa L. and effect of citric acid and humic acids as chelating agents; Acumulacion de uranio en Brassica rapa L. y efecto del acido citrico y acidos humicos como agentes quelantes

    Energy Technology Data Exchange (ETDEWEB)

    Lopez del R, H.; Perez C, G. A.; Davila R, J. I.; Mireles G, F. [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Cipres No. 10, Fracc. La Penuela, 98060 Zacatecas, Zac. (Mexico); Rodriguez H, G., E-mail: hlopezdelrio@hotmail.com [Universidad Autonoma de Zacatecas, Unidad Academica de Agronomia, Carretera Zacatecas-Guadalajara Km 15.5, Cieneguillas, Zacatecas (Mexico)

    2016-09-15

    Phyto extraction is a technique that makes use of plants for the remediation of soils contaminated with heavy metals. In this study the uranium incorporation in the Brassica rapa L. species was evaluated, in artificially contaminated inert soils with 40 mg U/kg, and the effect of adding of the natural chelating agents citric acid and humic acids in the accumulation of uranium was analyzed. Soil free of organic matter and biologically inert was obtained by controlled calcination s of natural soil. Cultures in the prepared soil consisted of five growth treatments: 1) cultivation without uranium or additives; 2) cultivation in the uranium presence; 3) cultivation with uranium and citric acid (2 g/kg); 4) cultivation with uranium and humic acids (10 g/kg); 5) uranium cultivation and combination of citric and humic acids at the same concentrations. There was no adverse effect on plant growth with the presence of uranium at the given concentration. Regarding the controls, the total biomass in the presence of uranium was slightly higher, while the addition of humic acids significantly stimulated the production of biomass with respect to the citric acid. The combined action of organic acids produced the highest amount of biomass. The efficiency of phyto extraction followed the order Humic acids (301 μg U/g) > Non-assisted (224 μg U/g) >> Citric acid + Humic acids (68 μg U/g) > Citric acid (59 μg U/g). The values of uranium concentration in the total biomass show that the species Brassica rapa L. has the capacity of phyto extraction of uranium in contaminated soils. The addition of humic acids increases the uranium extraction while the addition of citric acid disadvantages it. (Author)

  11. Estudios Cinéticos de la Disolución de Hidroboracita en Soluciones de Acido Clorhídrico y Acido Sulfúrico Dissolution Kinetics of Hydroboracite in Hydrochloric Acid and Sulphuric Acid Solutions

    Directory of Open Access Journals (Sweden)

    Graciela V Morales

    2008-01-01

    Full Text Available Se realizan estudios cinéticos de la disolución de hidroboracita en soluciones de ácido clorhídrico y ácido sulfúrico en un reactor tanque agitado discontinuo de acero inoxidable, a presión atmosférica. Se investiga el efecto de la temperatura, el tamaño de partícula, la relación sólido/líquido y la concentración de ácido sobre la velocidad de disolución. Los resultados experimentales permiten observar que la velocidad de disolución aumenta con el incremento de la concentración del ácido y de la temperatura, y disminuye con el aumento del tamaño de partícula y con la relación sólido/líquido. La energía de activación aparente calculada para la disolución de hidroboracita en soluciones de ácido clorhídrico es 44.9 kJ/mol, lo cual no permite inferir cual es la etapa controlante del proceso; mientras que la energía de activación aparente calculada para la disolución de hidroboracita en soluciones de ácido sulfúrico es 14.6 kJ/mol, lo cual permite inferir que el proceso ocurre con control difusivo.The dissolution kinetics of hydroboracite in hydrochloric acid and sulphuric acid solutions was investigated. The experiments were carried out in a steel batch reactor equipped with a mechanical stirrer, at atmospheric pressure. The effect of reaction temperature, particle size, solid/liquid ratio and acid concentration on the dissolution rate was determined. It was found that the dissolution rate increased with increasing the acid concentration and reaction temperature. However, the increase of particle size and solid/liquid ratio decreased the dissolution rate. The activation energy for the hydroboracite dissolution in hydrochloric acid was calculated as 44.9 kJ/mol, which does not permit to know the process controlling step. The activation energy for the hydroboracite dissolution in sulphuric acid was found to be 14.6 kJ/mol, which indicates that the dissolution is a diffusion controlled process.

  12. Effect of relative humidity on lipid oxidation in freezedried emulsions

    Directory of Open Access Journals (Sweden)

    Chinachoti, P.

    2000-10-01

    Full Text Available Oxidative stability was studied in a freeze-dried emulsion consisting of linoleic acid (LA, Tween-20, sucrose and maltodextrin in the presence of a catalyst (FeSO4/ascorbic acid. Changes in residual LA and conjugated dienes as a function of time were monitored at 0, 32, 43 and 75% relative humidities (RH. Based on GC analyses, LA oxidation was more significant in the surface fraction than the entrapped. The loss of surface oil upon storage may also be due to partial entrapment. However faster oxidation of the surface oil was confirmed by measurement of diene conjugation. Oxidation was more rapid at the lower relative humidities (0 and 32% RH and decreased with increasing RH. At high moisture, physical modifications in the sample were observed, including reduced porosity, structural collapse, reduction of the surface oil and coalescence of oil droplets triggered by sucrose crystallization. These may be responsible for the decreased oxidation. Sucrose crystallization at the higher humidities inhibited oxidation. In addition, while samples with similar glass transition temperature (Tg range behaved differently, samples with different glass transition range showed similar oxidative behaviour. Microstructural changes leading to oil entrapment and oil droplet coalescence were found to be significant, in this case.Se ha estudiado la estabilidad oxidativa en una emulsión liofilizada compuesta de ácido linoleico (LA, Tween-20, sacarosa y maltodextrina en presencia de un catalizador (FeSO4/ácido ascórbico. Los cambios en ácido linoleico remanente (LA y dienos conjugados en función del tiempo fueron monitorizados a humedades relativas (RH del 0, 32, 43 y 75%. Basado en análisis por cromatografía gaseosa, la oxidación de LA fue más significativa en la fracción superficial que en la encapsulada. La pérdida de aceite superficial con el almacenamiento puede deberse también al encapsulado parcial. Sin embargo, la más rápida oxidación del aceite

  13. CLA ¿antioxidante o prooxidante?

    Directory of Open Access Journals (Sweden)

    Cruz Pardos, S.

    2000-08-01

    Full Text Available The conjugated linoleic acid (CLA is a term referred to a mixture of positional and geometrical isomers of linoleic acid with double conjugated bonds in carbon atoms 10 and 12 or 9 and 11 with all of the possible cis and trans combinations. CLA is a naturally occurring substance in food. The major dietary sources of CLA are foods derived from ruminants, e.g. beef and cheese and its content increases when meals are processed. There is ample evidence showing that free radicals and oxidation processes mediated by free radicals play an important role in many pathological situations including cancer and atherosclerosis. Natural and synthetic antioxidants, tolerated by humans, are employed in order to avoid or treat these pathologies. In the present paper, articles evaluating the antioxidant or prooxidant activity of CLA have been revised. Preliminary in vivo and in vitro studies suggested the antioxidant role for CLA, however recent researches have not shown any evidence related to it. New studies have to be carried out in order to get more information on the antioxidant and protective role of CLA in free radical-related degenerative diseases.Se define como conjugado dienoico derivado del ácido linoleico (CLA a una mezcla de isómeros posicionales y geométricos del ácido linoleico con dobles enlaces conjugados en los átomos de carbono 10 y 12 ó 9 y 11 con todas las posibles combinaciones cis y trans. El CLA se encuentra de forma natural en los alimentos, principalmente de origen animal y en particular en las carnes y productos lácteos de rumiantes, y su contenido aumenta por el cocinado o procesado. Actualmente se acepta que los radicales libres y los procesos de oxidación mediados por los mismos juegan un papel importante en muchas situaciones patológicas incluyendo cáncer y aterosclerosis. Por ello la búsqueda de antioxidantes naturales y sintéticos, tolerados por el organismo, que puedan ayudar a prevenir o tratar estas patologías es

  14. Actividad antimicrobiana del acido acetico y el cepillo Colgate 360[grados] antibacterial[R]: un estudio in vitro

    National Research Council Canada - National Science Library

    Caballero Romero, Stephanny Gissell; Sandoval, Laura Viviana Herrera; Torres Pinzon, Harold; Martinez Lopez, Carmen Alodia; Claro Numa, Andrea

    2012-01-01

    Introduccion: el cepillo dental se convierte en una fuente potencial de patogenos orales cuando no se hace un proceso de desinfeccion despues de su uso, sobre todo en pacientes con infecciones en el sistema...

  15. Nefrotoxicidade experimental por ciclosporina : efeito protetor da normalização dos niveis de acido urico

    OpenAIRE

    Fernanda Cristina Mazali

    2006-01-01

    Resumo: Objetivo: Hiperuricemia é uma complicação freqüente da terapêutica com ciclosporina (CsA). Estudos anteriores demonstraram que a hiperuricemia exacerba a lesão intersticial e vascular no modelo experimental de nefrotoxicidade por CsA (CsA ntx). O presente estudo tem como hipótese que a normalização da uricemia preveniria o desenvolvimento da nefropatia crônica por CsA. Metodologia: A nefropatia crônica por CsA foi induzida em ratos machos, Sprague Dawley, através da injeção subcutânea...

  16. Nanofibras de Poli (L-Alanina-Dodecanodiol-L-Alanina-Acido Sebácico) [PADAS] elaboradas por electrospinning. Actividad antibacteriana

    OpenAIRE

    2011-01-01

    El electrospinning es una técnica para producir fibras poliméricas con diámetros de entre 50- 5000 nanómetros empleando fuerzas electrostáticas. Con esta metodología se han elaborado micro y nanofibras de polímeros como poliésteres, poliamidas, poliuretanos y otros. Sin embargo, se han publicado muy pocos trabajos sobre la elaboración de nanofibras de Poliesteramidas. PADAS es una Poliesteramidas derivada de 1,12-dodecanodiol, L-alanina y ácido. Sebácico, que se obtiene con ...

  17. New heterogeneous acid catalysts in the synthesis of biodiesel; Estudo de novos catalisadores heterogeneous acidos na sintese de biodiesel

    Energy Technology Data Exchange (ETDEWEB)

    Soldi, Rafael A.; Cesar-Oliveira, Maria Aparecida F. [Universidade Federal do Parana (UFPR), Curitiba, PR (Brazil). Dept. de Quimica. Lab. de Polimeros Sinteticos], e-mail: mafco@quimica.ufpr.br; Oliveira, Angelo R.S.; Ramos, Luiz P. [Universidade Federal do Parana (UFPR), Curitiba, PR (Brazil). Dept. de Quimica. Centro de Pesquisa em Quimica Aplicada (CEPESQ)

    2007-07-01

    In this work, sulfonated polystyrene compounds (PSS) were synthesized from linear polystyrene (PS). Several methods and experimental conditions were investigated for the sulfonation of PS, producing catalytically active polymeric materials with sulfonation degrees in the range of 5.0-6.2 mmol -SO{sub 3}H/g of dry polymer. The performance of these catalysts was evaluated in transesterification reactions of beef tallow and vegetable oils with ethanol and methanol. For the sake of comparison, the same reaction conditions employed for the PSS catalysts were also used for an Amberlyst 15 (3,7 mmol SO{sub 3}H/g - Aldrich). The PSS samples were shown to be insoluble in the reaction media, leading to conversion rates of 85%, 75% and 80% of the refined soybean oil, beef tallow and crude corn oil in to ethyl esters, respectively, and 94% of the refined soybean oil methyl esters. Amberlyst 15 was studied as an alternative to the process, but its conversion rate to alkyl esters was very low in the employed conditions. These results demonstrated that our synthetic PSS materials have a great potential to act as heterogeneous catalysts for transesterification. (author)

  18. Properties of microalloyed steels used for sour gas transportation; Propiedades de aceros microaleados utilizados para el transporte de gas acido

    Energy Technology Data Exchange (ETDEWEB)

    Saldana, E.; Castro, H.; Rodriguez, C.; Belzunce, J.

    2001-07-01

    The aim of this work was to evaluate the hydrogen induced damage on the microstructure and mechanical properties of API steels (X-52 and X-65 grades). Both steels were characterized in the as-rolled state and after being submitted to NACE TM 284/87, pH 3.5, test. Microstructure, mechanical properties and fracture behaviour have been determined along with the internal cracking due to hydrogen. The appearance of these cracks were located in reference to the geometry of the plate and the way they propagate through the steel microstructure was also assessed. (Author) 6 refs.

  19. Contribución de los Acidos Grasos Omega-3 para la Memoria y la Función Cognitiva

    Directory of Open Access Journals (Sweden)

    Dan L. Waitzberg

    Full Text Available Una disminución de la función cognitiva y de la memoria se considera que es una consecuencia normal del envejecimiento. Los ácidos grasos omega-3 poliinsaturados son cada vez más propuestos como suplementos dietéticos con la capacidad de reducir el riesgo de deterioro cognitivo, incluyendo la enfermedad de Alzheimer (EA. Objetivo: Estudiar el efecto de los omega-3 en el deterioro cognitivo a través de la revisión de estudios recientes de observación, intervención y experimentales. Métodos: Se realizó una búsqueda en PubMed, Medline, Cochrane y Embase para los estudios epidemiológicos y clínicos en la literatura internacional que utilizan combinaciones de las siguientes palabras clave: "la enfermedad de Alzheimer", "deterioro cognitivo leve", "función cognitiva", "factores dietéticos", "ácidos grasos omega-3", "EPA y DHA". Conclusiones: Los estudios han demostrado el papel protector de los ácidos grasos omega-3 en el deterioro cognitivo leve, demencia y en el riesgo y la progresión de la enfermedad de Alzheimer en los adultos mayores. Se necesitan más estudios para comprender el mecanismo de acción de los ácidos grasos omega-3 sobre la cognición. Las dosis, la composición de cápsulas de EPA y DHA y el tiempo de suplementación deben ser explorados.

  20. Bacterias halotolerantes/alcalofilas productoras de acido indol acético (AIA asociadas a Arthrospira platensis (Cyanophyceae

    Directory of Open Access Journals (Sweden)

    Liliana Cecilia Gómez Gómez

    2012-08-01

    Full Text Available Título en ingles: Halotolerant alkalophilic and indolacetic acid producing acid producing bacteria associated with Arthrospira platensis (Cyanophyceae Resumen: Este trabajo tuvo como propósito contribuir al conocimiento de la interacción entre la cianobacteria alcalófila Arthrospira platensis y las bacterias que crecen asociadas a su mucilago. Se desarrolló un  medio de cultivo heterotrófico en el cual se aislaron cinco cepas bacterianas asociadas a un monocultivo de A. platensis. Se determinó la capacidad de estas cinco cepas para producir ácido 3- indol acético (AIA. La tipificación molecular de los aislamientos bacterianos permitió identificarlos como Exiguobacterium aurantiacum str. DSM 20416, Xanthomonas sp. ML-122, Halomonas sp. Ap-5, Bacillus okhensis str.  Kh10-101, Indibacter alkaliphilus, type str. LW1T; todas las cepas bacterianas obtenidas  son halotolerantes, alcalófilas y productoras de AIA. Los resultados aportan evidencia para sugerir una interacción benéfica entre A. platensis y sus bacterias asociadas,  quizá como estrategia evolutiva  de cooperación para desarrollarse en  un ambiente hipersalino.    Palabras claves: Bacillus okhensis, Exiguobacterium aurantiacum, Halomonas sp., Indibacter alkaliphilus. Xanthomonas sp. Abstract: The aim of this study was contribute to knowledge over alkalophilic cianobacteryum  Arthrospira platensis  and their  interaction with some associated bacteria growing in their mucilage. Heterotrophic culture medium was designed, in this medium were isolated five bacterial strains associated to single culture of A. platensis. It was measured the 3-indol acetic acid (IAA production by these bacterial strains. Molecular typing allowed identify these bacterial strains like Exiguobacterium aurantiacum str. DSM 20416, Xanthomonas sp. ML-122, Halomonas sp. Ap-5, Bacillus okhensis str. Kh10-101, Indibacter alkaliphilus, type str. LW1T; all these bacteria are halotolerant, alkalophilic and IAA producer.  The findings allow suggest a beneficial interaction between A. platensis and their associated bacteria, maybe as evolutionary strategy of cooperation to grow and develop in  hypersaline environments. Key words: Bacillus okhensis, Exiguobacterium aurantiacum, Halomonas sp., Indibacter alkaliphilus.Xanthomonas sp.

  1. Stability constant of the lanthanum complex with humic acid; Constante de estabilidad del complejo de lantano con acido humico

    Energy Technology Data Exchange (ETDEWEB)

    Jimenez R, M.; Solache R, M. J. [ININ, Carretera Mexico-Toluca s/n, Ocoyoacac 52750, Estado de Mexico (Mexico)

    2008-07-01

    The work described here is a study on the formation of trivalent lanthanum complex with humic acid. Commercial humic acid was purified and then characterized by various analytical techniques. The stability constant determined by a radiochemical method has a worth of log {beta}{sub La},{sub AHA} = 13.6. (Author)

  2. Acido, ergo sum: Holger Hydén – the neuroscientist in Cortázar's Hopscotch

    Directory of Open Access Journals (Sweden)

    Guillermo Delgado

    2013-06-01

    Full Text Available The fictional Italian author Morelli is throughout the novel “Hopscotch” (1963 Julio Cortázar's alter ego. This character proposes an unoriginal literary hypothesis in chapter 62. There is an allusion to a particular Swedish that ‘is working on a chemical theory of thought.’ The Swedish neuroscientist under analysis is Holger Hydén (1917-2000, by then professor and chairman of the Department of Histology at the University of Göteborg. Hydén, who was the first to work in neurobiological micromethods, is mentioned by Morelli due to his participation in a symposium held at the end of January 1961, in San Francisco. His pioneering work will never be completely forgotten, because Hydén's neuroscientific legacy lives and will live in Cortázar's “Hopscotch”.

  3. Revisión de los niveles de acidos grasos trans encontrados en distintos tipos de alimentos

    Directory of Open Access Journals (Sweden)

    Vicario, I. M.

    2007-03-01

    Full Text Available In this paper a comprehensive review of trans-fatty acid levels reported in different types of food products is offered. The lowest levels are found in some types of bread (0,1% while the highest levels (up to 40% are found in fried potatoes. Some foods like shortenings, cakes and pastries may have up to 30% of these fatty acids. In milk and dairy products the reported levels are between 1.50% and 5.20%, in meat and derived products between 0.20% and 21,30%; in chocolates from 0% to 15, 70%. The greatest variability is found in margarines, where a variety has been reported from “trans-free products” to products containing up to 34. 30%. In relation to the trans-fatty acid profile, 18:1t is the most abundant fatty acid found in the majority of foods, followed by C18:2t, C18:3t, C18:1t y C14:1t. Due to the negative health effects of these fatty acids, there is a trend to reduce their levels in food products and to include them in the nutritional label of food packaging.En este trabajo se realiza una exhaustiva revisión bibliográfica de los contenidos en grasos trans en alimentos de distinto origen. Los niveles más bajos se encuentran en algunos tipos de pan (0,10%, y los más elevados (hasta 40%, en algunas muestras de patatas fritas. Alimentos tales como shortenings, algunos tipos de galletas y bollería contienen hasta el 30% de dichos ácidos grasos. En las leches y derivados se encuentran cantidades entre 1,50% y 5,20%; en carnes y derivados entre 0,20% y 21,30%; en chocolates desde cantidades nulas hasta 15,70%. La mayor variabilidad se registra en margarinas, entre las que se encuentran desde las “libres de trans”, hasta algunas con 34,30% de estos ácidos grasos. En cuanto a los distintos isómeros, el mayoritario es el C18:1t seguido del C18:2t, C18:3t, C18:1t y C14:1t. Debido a los efectos desfavorables que presentan sobre la salud se observa en los últimos años una tendencia a reducir este tipo de ácidos grasos en algunos alimentos y a incluirlos en el etiquetado nutricional de los alimentos.

  4. Gas chromatography of alkylphosphonic and dialkyl phosphinic acids; Cromatografia en fase gaseosa de acidos alquifosfonicos y dialquilfosinicos

    Energy Technology Data Exchange (ETDEWEB)

    Gasco Sanchez, L.; Barrera Peniero, R.; Ramirez Caceres, A.; Marin Munoz, M.

    1978-07-01

    After carrying out an optimization study on the separation conditions for the TMSr- derivatives, of the hexyl-, cyclohexyl-, heptyl-, and octyl-phosphonic acids; dihexyl dicyclohexyl-, heptyl-, and octyl-phosphinic acids, and dioctyl phosphine oxide, their retention indices (I) at two temperatures and on the OV-1 and OV-17 stationary phase were determined. Correlations between I and molecular structure were established. Calibration factors of these compounds in the flame ionization detector were studied, and the results analyzed taking into account the variables affecting the quantitative results, These results were unbiased but they had a lower precision than that usually achievable in gas chromatography. (Author) 24 refs.

  5. Descripción del estado acido base en pacientes con quemaduras térmicas agudas: serie de casos

    OpenAIRE

    nieto angel, maria victoria; cortes puentes, luis arcadio; Linares Mendoza, Gerardo; navarrete, norberto; fernandez, federico

    2014-01-01

    Introducción: Los pacientes con lesiones térmicas presentan alteraciones fisiológicas complejas que hacen difícil la caracterización del estado ácido-base y así mismo alteraciones electrolíticas e hipoalbuminemia que pudieran estar relacionados con un peor pronóstico. Se ha estudiado la base déficit (BD) y el lactato, encontrando una gran divergencia en los resultados. Por lo anterior, el análisis físico-químico del estado ácido-base podría tener un rendimiento superior a los métodos tradic...

  6. Estudio de pacientes con aciduria glutarica tipo II, mediante la incubacion de fibroblastos con acidos palmitico y miristico tritiados

    National Research Council Canada - National Science Library

    Osorio Orozco, Jose Henry

    2011-01-01

    Introduccion: la aciduria glutarica tipo II, o deficiencia multiple de acil-CoA deshidrogenasas, es un trastorno causado por deficiencia de la flavoproteina de transferencia de electrones, de su oxidorreductasa o de ambas...

  7. Effects of acido-basic support properties on the catalytic hydrogenation of acetylene on gold nano-particles

    Science.gov (United States)

    Manda, Abdullah Ahmed

    Metallic gold nanoparticles supported on gamma-Al2O 3 and magnesia-alumina mixed oxide, with different magnesia content have been prepared by sol-gel method and characterized by different techniques (inductive coupled plasma-mass spectroscopy (ICP-MS), XRD, BET surface area analysis, transmission electron microscopy (TEM), CO2 and NH 3 temperature programmed desorption (TPD), H2 temperature programmed reduction (TPR) and FTIR of adsorbed CO2). Such systems were found to produce catalysts with controllable acidity, varying from catalyst possessing large density of acidic and low density of basic sites, others with acidic and basic sites of equal strength and density, and others with large basic and low acid sites densities, respectively. The catalytic assessment of the generated acidity was carried out using 2-propanol decomposition as a test reaction. The results obtained indicate that the presence of magnesia and reduced gold nanopartilces has imparted the catalysts, 1%Au/4%Mg-Al 2O3 and 1%Au/8%Mg-Al2O3, with significant base-catalytic properties. Acetylene hydrogenation and formation of coke deposits were investigated on a gold catalyst supported on gamma-Al2O3 and gold supported on alumina-magnisia mixed oxide with different gold content; 1%Au/gamma-Al 2O3, 1%Au/15%Mg-Al2O3, 2%Au/15%Mg-Al 2O3 and 4%Au/15%Mg-Al2O3. The effect of the H2/C2H2 ratio was studied over a range of values. The catalytic activity and selectivity towards ethylene and other products were investigated at different reaction temperatures. Acetylene hydrogenation was investigated in the presence and absence of ethylene in stream. It is investigated that the adsorption of the triple bond is preferred over the double bond and during selective catalytic (SCR) of C2H2 the two hydrocarbons do not compete for the same adsorption sites. The deactivation of catalysts was studied by temperature programmed oxidation (TPO). Higher content of coke over 1%Au/Al2O3 catalyst was investigated in contrast to the other catalysts in which the basisity of magnesia-alumina supports could have played an important role in inhibiting the acidic carbon formation by possessing smaller number and/or weaker acid sites.

  8. Producción de acido láctico por Lactobacillus plantarum L10 en cultivos batch y continuo

    Directory of Open Access Journals (Sweden)

    Waldir Estela

    2013-04-01

    Full Text Available Se ha ensayado a escala de laboratorio la cepa Lactobacillus plantarum L10, para la producción de ácido láctico en cultivos batch y continuo; además se ha optimizado la composición del medio y las condiciones de cultivo para este propósito. Los mejores parámetros de producción de ácido láctico encontrados en cultivo batch fueron los siguientes: YP/S 86,1%; PP 5,4 g/L/h; unido a YX/S 13,2%; PX 1,2 g/L/h y μ = 0,2 h-1, el cultivo se ha llevado a cabo en un medio conteniendo glucosa 70 g/L; extracto de levadura 12,1 g/L; KH2PO4 1,2 g/L; (NH42HPO4 1,2 g/L; citrato de amonio 3,0 g/L; MgSO4. 7H2O 0,3 g/L y MnSO4. 4H2O 0,03 g/L. Así mismo los mejores parámetros de producción de ácido láctico encontrados en cultivo continuo fueron los siguientes: YP/S 96%; P´P 6,0 g/L/h; unido a YX/S 19 %; P´X 1,2 g/L/h; y tasa de dilución (D 0,46 h-1.

  9. Efeitos de oxigenio singlete gerado fotoquimica e enzimaticamente sobre o acido ribonucleico de transferencia de E. coli

    OpenAIRE

    Maria Cristina Marcucci

    1986-01-01

    Resumo: O malonaldeído e o ácido indol-3-acético são oxidados aerobicamente pela peroxidase, produzindo oxigênio singlete em ambos os processos, e no último caso também indol-3-aldeído excitado. Estes processos são chamados de biofotoenergizados. Entretanto, existem outras vias de geração de oxigênio singlete como processos fotoquímicos, pelo uso de sensibilizadores. Foi comprovada a similaridade entre os efeitos de oxigênio singlete gerado fotoquimica e enzimaticamenle sobre o ácido ribonucl...

  10. Contenidos de isomeros trans de los acidos grasos en productos carnicos. (III) Tejido adiposo y grasa intramuscular de vacuno

    OpenAIRE

    Lluch, M. C.; Roca de Vinyals, M.; Parcerisa Egea, Javier; Guardiola Ibarz, Francesc; Codony Salcedo, Rafael; Rafecas Martínez, Magdalena; Boatella Riera, Josep

    1993-01-01

    Se presentan los resultados obtenidos para la determinación de ácidos grasos en una serie de muestras de tejidos subcutáneo y muscular, procedentes de canales de vacuno, por aplicación de la cromatografía en fase gaseosa, para los que se obtuvieron unos valores medios de 58.7% de ácidos saturados, 39.1 % de monoinsaturados y 2.7% de polinsaturados, en el tejido adiposo, y de 44.7% de saturados, 46.1% de monoinsaturados y 9.4% de polinsaturados, en el tejido muscular. Los contenidos de ácidos ...

  11. Volatile fatty acid degradation kinetics in anaerobic process; Cinetica de la degradacion de acidos grasos volatiles en procesos anaerobios

    Energy Technology Data Exchange (ETDEWEB)

    Riscado, S.; Osuna, B.; Iza, J.; Ruiz, E. [Universidad del Pais Vasco. Bilbao (Spain)

    1998-10-01

    While searching for the optimal substrate load for anaerobic toxicity assays, the inhibition caused by the propionic acid has been addressed. Lab scale experiments have been carried out to assess the effects of different loads and acid ratios. Results bad been subjected to kinetic analysis and show the degradation follows a first order kinetic, and acetic is easier to degrade than propionic acid. The optimal load for a 100 ml vial assay is composed of 158 mg COD of the 3:1:1 HAc:HPr:HBu mixture. (Author) 9 refs.

  12. Contenidos de isomeros trans de los acidos grasos en productos carnicos (II). Tejidos adiposo y grasa intramuscular del cerdo

    OpenAIRE

    Lluch, M. C.; Pascual, J.; Parcerisa Egea, Javier; Guardiola Ibarz, Francesc; Codony Salcedo, Rafael; Rafecas Martínez, Magdalena; Boatella Riera, Josep

    1993-01-01

    Se presentan los resultados obtenidos en la determinación de ácidos grasos trans en una serie de muestras de tejidos subcutáneo y muscular, procedentes de canales de cerdo, mediante cromatografía en fase gaseosa. Ambos tipos de grasas presentan valores similares y relativamente bajos, con un valor medio del 0.6% de 018:1 t. Se detecta una marcada influencia de la alimentación, puesta de manifiesto por las diferencias significativas obtenidas para los contenidos de C18:1 trans, en función del ...

  13. REGULACION DEL METABOLISMO DEL FRUTO DE TOMATE (SOLANUM LYCOPERSICUM) POR UN FACTOR DE TRANSCRIPCION BZIP REGULADO POR ACIDO ABSCISICO

    OpenAIRE

    BASTIAS BARRIENTOS, ADRIANA DEL CARMEN

    2011-01-01

    El desarrollo del fruto es un proceso complejo regulados por hormonas vegetales y que involucra varios cambios metabólicos y fisiológicos coordinados. Mientras etileno actúa en etapas tardías de la maduración de frutos climatéricos tales como tomate, nuevas evidencias señalan una posible función de la fitohormona ácido abscísico (ABA) en etapas más tempranas de la inducción de la maduración. ABA es conocida por regular el desarrollo y maduración de semillas y estar involucrada en conferir...

  14. Detalhes sobre a historia geologica da Bacia Sergipe/Alagoas a partir de biomarcadores acidos e sintese de biomarcadores

    OpenAIRE

    Pericles Barreto Alves

    1997-01-01

    Resumo: Este trabalho é dividido em três partes distintas. A primeira parte envolve o estudo de nove (9) óleos da bacia Sergipe-Alagoas originados das formações Coqueiro Sêco, Carmópolis e Muribeca do Apitiano (97-113m.a.). A análise dos constituíntes neutros permitiu caacterizar esses óleos como de origem marinha evaporítica e pouco evoluídos termicamente. Os níveis de biodegradação destes óleos a partir da alteração de determinadas classes de biomarcadores, variam entre os níveis de biodegr...

  15. Use of immobilized phospholipase A1-catalyzed acidolysis for the production of structured phosphatidylcholine with an elevated conjugated linoleic acid content

    Directory of Open Access Journals (Sweden)

    Baeza-Jiménez, R.

    2012-03-01

    Full Text Available Structured phosphatidylcholine (SPC was successfully produced via immobilized phospholipase A1 (PLA1 – catalyzed acidolysis of phosphatidylcholine (PC with conjugated linoleic acid (CLA. The effects of enzyme loading (2, 5, 10, 15 and 20%, with respect to the weight of substrates, temperature (20, 30, 40, 50 and 60 °C and the molar ratio of substrates (1:2, 1:4, 1:6, 1:8 and 1:10, PC/CLA were evaluated to maximize the incorporation of CLA into PC. The maximum incorporation of CLA achieved was ca. 90% for 24 h of reaction at 50 °C and 200 rpm, using a 1:4 substrate molar ratio and an enzyme loading of 15%.

    Fosfatidilcolina estructurada (SPC fue producida por acidólisis de fosfatidilcolina (PC y ácido linoleico conjugado (CLA usando fosfolipasa A1 (PLA1 inmovilizada. Los efectos de carga de enzima (2, 5, 10, 15 y 20%, respecto al peso de los sustratos, temperatura (20, 30, 40, 50 y 60 °C y la relación molar de sustratos (1:2, 1:4, 1:6, 1:8 y 1:10, PC/CLA fueron evaluados para alcanzar la más elevada incorporación de CLA en PC. La máxima incorporación de CLA obtenida fue de 90% a 50 °C y 200 rpm, para una relación molar 1:4 con una carga de enzima de 15% después de 24 h.

  16. Perfil de ácidos graxos do leite de cabras leiteiras alimentadas com dieta contendo dois níveis de óleo de arroz

    Directory of Open Access Journals (Sweden)

    M.S. Vilanova

    2012-12-01

    Full Text Available Foram testados os efeitos de dois níveis de extrato etéreo à base de óleo de arroz no concentrado em 30 cabras Saanen durante a fase inicial de lactação. A alimentação baseou-se na relação 60% de volumoso (feno de alfafa e 40% de concentrado comercial com dois níveis de extrato etéreo (3% e 5%. As variáveis estudadas foram a quantificação e qualificação do perfil de ácidos graxos do leite total e frente ao tempo de lactação. O acréscimo de óleo de arroz na dieta diminuiu (P<0,05 a concentração de ácidos graxos saturados e aumentou (P<0,05 a concentração de ácidos graxos poli-insaturados no leite caprino. O ácido linoleico conjugado (ALC também é afetado positivamente pelo acréscimo de óleo de arroz na dieta. A inclusão de óleo de arroz nos níveis de 3% e 5% da matéria seca, na dieta de cabras leiteiras da raça Saanen, influencia o perfil de ácidos graxos do leite, com ênfase no ALC, até a 11ª semana de lactação.

  17. Composição química e de ácidos graxos do músculo longissimus dorsi e da gordura subcutânea de tourinhos Red Norte e Nelore Chemical composition and of fatty acids of the muscle longissimus dorsi and backfat of Red Norte and young Nellore bulls

    Directory of Open Access Journals (Sweden)

    Leandro Sâmia Lopes

    2012-04-01

    Full Text Available Objetivou-se com este trabalho avaliar a composição química e o perfil de ácidos graxos do músculo longissimus dorsi e da gordura subcutânea de tourinhos Red Norte e Nelore terminados em confinamento. Utilizaram-se 44 animais, sendo 22 Red Norte com peso vivo inicial médio de 367±30 kg e 22 do grupo Nelore com peso vivo inicial médio de 361±30 kg. Os animais receberam ração à vontade durante 112 dias e foram abatidos com 519 e 482 kg, respectivamente. Amostras do músculo longissimus dorsi e da gordura subcutânea foram coletadas 24 horas após abate entre a 12ª e 13ª costelas para análise da composição centesimal e do perfil de ácidos graxos. As análises de ácidos graxos foram realizadas por meio de cromatografia gasosa, em coluna capilar de 100 m. Não houve diferença na composição química da carne entre os grupos genéticos. Nos animais Red Norte, foram maiores os teores dos ácidos graxos pentadecanoico, palmítico, palmitoleico, linoleico e ácido linoleico conjugado (CLA, enquanto nos animais Nelore foi encontrado o maior teor de ácido oleico. O músculo longissimus dorsi apresentou maiores teores dos ácidos láurico, heptadecenoico, esteárico, linoleico, α-linolênico e araquidônico. Em comparação ao músculo longissimus dorsi, na gordura subcutânea foram maiores os teores dos ácidos mirístico, miristoleico, pentadecanoico, palmítico, palmitoleico, oleico e CLA. Os animais Red Norte apresentaram maiores teores de ácidos graxos saturados em comparação aos Nelore. Em bovinos, o perfil de ácidos graxos depositados no músculo é diferente do observado na gordura subcutânea. O perfil de ácidos graxos da carne de tourinhos difere entre grupos genéticos.The objective of this study was to evaluate the chemical composition and the fatty acid profile of the longissimus dorsi muscle and the backfat thickness of Red Norte and Nellore young bulls finished in feedlot. Fourty-four animals (22 Red Norte with

  18. Sensibilidad a la amoxicilina de bacterias anaerobias de pacientes con periodontitis agresiva.(Articulo de Investigacion: Cientifica y Tecnologica)(Perspectiva general del medicamento)

    National Research Council Canada - National Science Library

    Cardona, Dora; Hernan Henao, Jorge; Aberto Aristizabal, Juan; Catalina Catano, Laura; Hernando Sanabria, Jairo

    2012-01-01

    .... La amoxicilina y la amoxicilina/ acido clavulanico son algunos de los mas utilizados. Establecer el tipo de bacterias y su sensibilidad a la amoxicilina y a la amoxicilina/acido clavulanico en pacientes con periodontitis agresiva...

  19. Caracterización y estudio de ácidos arildentiobarbitúricos formados por reacción entre el ácido 2-tiobarbitúrico (atb) y aldehídos aromáticos

    OpenAIRE

    Guillén Sanz, Remedios

    1986-01-01

    En esta memoria se ha realizado un estudio de la reaccion acido 2-tiobarbiturico-aldehido a traves de la sintesis de los derivados: acido 5-(anisiliden)-2-tiobarbiturico acido 5-(p-dimetilaminobenciliden)-2-tiobarbiturico y acido 5-(saliciliden)bis-2-tiobarbiturico. Este estudio comprende la preparacion de los tiobarbituricos su caracterizacion espectral estabilidad y determinacion de constantes fisico-quimicas importantes (pka coeficiente de particion en distintos sistemas disolventes pa...

  20. Determinación espectrofluorimétrica de fitohormonas derivadas del indol y del naftaleno

    OpenAIRE

    Blanc García, María del Rosario

    2014-01-01

    Se realiza el estudio de las propiedades fluorescentes y la puesta a punto de metodología espectrofluorimétrica en disolución y en fase sólida para la determinación en aguas, suelos y formulaciones comerciales de las fitohormonas derivadas del indol: acido indol-3-acetico. acido indol-3-butirico, acido indol-3-propinoico y acido 5-hidroxiindol-3-acetico; y del naftaleno: acido 1-naftilacetico y 1-naftilacetamida. se lleva a cabo la determinación individual de cada una de las fitohormonas as...

  1. Solution for the power flow in vector environment using the bi-conjugated stabilized gradient method; Solucao do fluxo de potencia em ambiente vetorial usando o metodo do gradiente bi-conjugado estabilizado

    Energy Technology Data Exchange (ETDEWEB)

    Borges, Carmen L.T.; Coutinho, Alvaro L.G.A.; Falcao, Djalma M. [Universidade Federal, Rio de Janeiro, RJ (Brazil). Coordenacao dos Programas de Pos-graduacao de Engenharia

    1996-12-31

    This work presents a methodology for the solution of the power flow problem using the bi-conjugated stabilized gradient method pre-conditioned to the solution of the linearized system of Newton-Raphson method. Three different pre-conditioning matrices were researched aiming the reduction in the computation costs. The algorithm was ran in parallel vector computational environment. The presented results indicate velocity gain of the proposed method when compared to the Newton-Raphson conventional algorithm with solution of the linearized system by direct methodology 12 refs., 2 figs., 2 tabs.

  2. Ácido linoléico conjugado: efeitos no perfil lipídico e na composição corporal de camundongos exercitados Conjugated linoleic acid: effects on lipid profile and body composition of exercised mice

    OpenAIRE

    Silvio Anderson Toledo Fernandes; Antônio José Natali; Mateus Camaroti Laterza; Bruno Gonzaga Teodoro; Frederico Souzalima Caldoncelli Franco; Maria do Carmo Gouveia Peluzio

    2011-01-01

    Objetivo: Avaliar os efeitos do CLA associado à dieta hiperlipídica sobre o perfil lipídico e composição corporal de camundongos knockout para o gene da ApoE exercitados. Métodos: 32 camundongos foram divididos e submetidos à dieta normo e hiperlipídica suplementadas ou não com 1% de CLA. Todos realizaram exercício físico em esteira, durante 12 semanas. Utilizou-se o teste de Kruskal-Wallis ao nível de significância de 5%. Resultados: Os animais que ingeriram dieta hiperlipídica com CLA aumen...

  3. A NIM (Nuclear Instrumentation Module) system conjugated with optional input for pHEMT amplifier for beta and gamma spectroscopy; Um sistema de modulos NIM conjugados com entrada opcional por amplificador pHEMT para espectroscopia beta e gama

    Energy Technology Data Exchange (ETDEWEB)

    Konrad, Barbara; Lüdke, Everton, E-mail: barbarakonradmev@gmail.com, E-mail: eludke@smail.ufsm.br [Universidade Federal de Santa Maria (LAE/UFSM), RS (Brazil). Lab. de Astrofisica e Eletronica

    2014-07-01

    This work presents a high speed NIM module (Nuclear Instrumentation Module) to detect radiation, gamma and muons, as part of a system for natural radiation monitoring and of extraterrestrial origin. The subsystem developed consists of a preamplifier and an integrated SCA (Single Channel Analyzer), including power supplies of ± 12 and ± 24V with derivations of +3.6 and ± 5V. The single channel analyzer board, consisting of discrete logic components, operating in window modes, normal and integral. The pulse shaping block is made up of two voltage comparators working at 120 MHz with a response time > 60 ns and a logic anticoincidence system. The preamplifier promotes a noise reduction and introduces the impedance matching between the output of anode / diode photomultiplier tubes (PMTs) and subsequent equipment, providing an input impedance of 1MΩ and output impedance of 40 to 140Ω. The shaper amplifier is non-inverting and has variable input capacitance of 1000 pF. The upper and lower thresholds of the SCA are adjustable from 0 to ± 10V, and the equipment is compatible with various types of detectors, like PMTs coupled to sodium iodide crystals. For use with liquid scintillators and photodiodes with crystals (CsI: Tl) is proposed to include a preamplifier circuit pHEMT (pseudomorphic High Electron Mobility Transistor) integrated. Yet, the system presents the possibility of applications for various purposes of gamma spectroscopy and automatic detection of events producing of beta particles.

  4. Production of membrane-electrode assemblies to be used in high temperature solid oxide fuel cells; Producao de conjugados eletrolito-eletrodos para pilhas a combustivel de oxido solido de alta temperatura

    Energy Technology Data Exchange (ETDEWEB)

    Villalobos, Pedro R.; Silva, Gilmar Clemente; Miranda, Paulo Emilio V. de [Coordenacao dos Programas de Pos-graduacao de Engenharia (COPPE/UFRJ), Rio de Janeiro, RJ (Brazil). Programa de Engenharia Metalurgica e de Materiais. Lab. de Hidrogenio], e-mail: vlobos@labh2.coppe.ufrj.br

    2004-07-01

    This article describes the production and characterization of membrane-electrode assemblies to be used in high temperature solid oxide fuel cells. The single cells produced were characterized using scanning electron microscopy and X ray diffractometry, seeking the morphological characterization of the complete device and to verify the stability of the materials used with respect to the processing conditions. (author)

  5. Análisis del problema conjugado de transferencia de calor en un microcanal para un flujo electro-ósmotico de un fluido con modelo reológico Phan-Thien Tanner /

    OpenAIRE

    Escandón Colin, Juan Pablo

    2011-01-01

     tesis que para obtener el grado de Doctor en Ingeniería Mecánica, presenta Juan Pablo Escandón Colin ; asesor Oscar Eladio Bautista Godínez. ii, 116 páginas : ilustraciones. Doctorado en Ingeniería Mecánica UNAM, Facultad de Ingeniería, 2011

  6. Multivalent system for therapy of non-Hod king lymphomas based on Anti-CD20 conjugated to gold nanoparticles; Sistema multivalente para terapia de linfomas no-Hodking basado en Anti-CD20 conjugado a nanoparticulas de oro

    Energy Technology Data Exchange (ETDEWEB)

    Miranda O, R. M.

    2014-07-01

    In recent publications has been reported that gold nanoparticles have an effect in reducing the expression of the oncogene Bcl -2 and have a high biocompatibility , this is the importance for using gold nanoparticles for this work. The antibody CD20 is an antibody that specifically binds to that over expressed CD20 antigen on the cell membrane of B lymphoma cell non- Hodgkin (cell line Raji) behold the importance of combining this bio molecule to gold nanoparticles since they have a high specificity with CD20 positive cells , also to carry out the antigen- antibody immunological reactions triggered mediating cell lysis, possibly by cytotoxicity and apoptosis. Therefore, this system must have characteristics of both components to eliminate B cell non- Hodgkin lymphoma.In this work it was studied a multivalent system composed of gold nanoparticles and anti-CD20 antibody, the term multi valency refers to the number of biomolecules attached to the surface of the gold nanoparticle. The synthesis and characterization of the gold nanoparticles and the multivalent system was performed and the effect of the multivalent system on the expression of oncogene Bcl-2 (group of proteins associated with the apoptotic pathway) was evaluated. Characterization of raw materials and the multivalent system was performed using spectroscopic and microscopic techniques, this to verify structural changes in raw materials and thus confirm the formation of CD20 binding to the surface of the nanoparticle gold by the bond between gold and sulfur in the cysteines of CD20. Taking advantage that the metal nanoparticles have the optical property of surface plasmon resonance, the absorption of gold nanoparticles was measured on the UV-Vis as it is affected by the surface molecules bind to it, showing a bathochromic displacement effected. The hydrodynamic diameter of the gold nanoparticles was measured to verify that the antibody is bound to the surface; this evidence was complemented by micrographs obtained by transmission electron microscopy. (Author)

  7. Production and characterization of an acido-thermophilic, organic solvent stable cellulase from Bacillus sonorensis HSC7 by conversion of lignocellulosic wastes

    Directory of Open Access Journals (Sweden)

    Fatemeh Azadian

    2017-06-01

    Full Text Available The acidophilic and thermophilic cellulase would facilitate the conversion of lignocellulosic biomass to biofuel. In this study, Bacillus sonorensis HSC7 isolated as the best thermophilic cellulose degrading bacterium from Gorooh hot spring. 16S rRNA gene sequencing showed that, this strain closely related to the B. sonorensis. CMCase production was considered under varying environmental parameters. Results showed that, sucrose and (NH42SO4 were obtained as the best carbon and nitrogen sources for CMCase production. B. sonorensis HSC7 produced CMCase during the growth in optimized medium supplemented with agricultural wastes as sole carbon sources. The enzyme was active with optimum temperature of 70 °C and the optimum CMCase activity and stability observed at pH 4.0 and 5.0, respectively. These are characteristics indicating that, this enzyme could be an acidophilic and thermophilic CMCase. Furthermore, the CMCase activity improved by methanol (166%, chloroform (152%, while it was inhibited by DMF (61%. The CMCase activity was enhanced in the presence of Mg+2 (110%, Cu+2 (116%, Triton X-100 (118% and it retained 57% of its activity at 30% NaCl. The compatibility of HSC7 CMCase varied for each laundry detergent, with higher stability being observed in the presence of Taj® and darya®. This enzyme, that is able to work under extreme conditions, has potential applications in various industries.

  8. Study of the interaction of enzyme Heparanase 1 (HPSE1) active with deoxyribonucleic acids; Estudo de interacao da enzima Heparanase 1 (HPSE 1) ativa com acido desoxirribonucleicos

    Energy Technology Data Exchange (ETDEWEB)

    Cid, Gisele da Silva

    2016-07-01

    The human heparanase 1 (HPSE 1) is a protein with multiple functions and has emerged as a promising therapeutic target in the context of antitumor therapy. This fact is due to its clinical relevance in the tumor development and progression, as determined by their enzymatic ability to degrade heparan sulfate (HS), the main constituent of the extracellular matrix, providing a tumor microenvironment to tumor dissemination. In addition, this protein plays a significant role in the increase of tumor cells migration ionizing radiation dose delivery in radiotherapy from the increase in the expression levels of HPSE1. In order to evaluate in more detail the functions of active HPSE1, it has been proposed to characterize the interaction of human heparanase protein 1 with deoxyribonucleic acids. Our results are original and point to a new function of HPSE1 of the endonuclease type. (author)

  9. Influence of state of charge in lead-acid batteries operating in PV systems; Comportamiento no repetitivo de las baterias de plomo-acido operando en sistemas FV.

    Energy Technology Data Exchange (ETDEWEB)

    Vela, N.; Chenlo, F.

    2004-07-01

    Correct determination of the overcharge cut-off voltage is a key point for both the optimal operation and maximum life-time of batteries in photovoltaic (PV) systems. This work presents the results of analysing the influence on charge voltage of different operation conditions, mainly current rate, temperature and state of charge (SOC). From the results obtained we have observed that voltage evolution during a charge process depends on its activation degree of the battery. The battery activation is reached when battery was previously fully charged. So, we can conclude that variation of the charge voltage with time as function of starting point (fully charged or fully discharged) together with current rate and temperature should be taking into account in the battery SOC determination and in the design of charge controllers. (Author)

  10. Detection of fluorescent labelled oligonucleotides using oxalate chemiluminiscence. Estudio de la deteccion de oligonucleotidos marcados con compuestos fluorescentes utilizando la quimioluminiscencia de los esteres del acido oxalico

    Energy Technology Data Exchange (ETDEWEB)

    Eritia, R. (Barcelona Univ. (Spain). Dept. de Quimica Organica); Johnson, D.; Paige, J.; Walker, P.; Kaplan, B. (Beckman Research Institute of City of Hope, CA (USA))

    1989-01-01

    The preparation and characterization of oligonucleotides containing fluorescent compounds at the 5' terminus is described together with the utilization of oxalate chemiluminiscence for their detection. (Author)

  11. ANALISIS DE ESTRUCTURA-FUNCION DEL CO-TRANSPORTADOR DE NA+/ACIDO ASCORBICO SVCT2: MECANICO DE TRANSPORTE Y ASPECTOS REGULATORIOS

    OpenAIRE

    GODOY SANCHEZ, ALEJANDRO SAMUEL

    2004-01-01

    Hasta el momento se han identificado dos sistemas que median el transporte de vitamina C en células de mamíferos . La forma oxidada de esta vitamina (ácido deshidroascórbico) ingresa a la célula por los transportadores facilitativos de hexosas (GLUTs), en tanto que la forma reducida (ácido ascórbico) lo hace a través de una familia de proteínas denominadas SVCTs, de los cuales se han descrito dos miembros hasta el momento, SVCTI y SVCT2. Estos últimos transportadores se caracterizan por...

  12. Comparative experimental study on municipal wastewater disinfection with ozone and peracetic acid; Indagine sperimentale comparata sulla disinfezione di acque reflue urbane con ozono e acido peracetico

    Energy Technology Data Exchange (ETDEWEB)

    Andreottola, G.; Bertola, P.; Ziglio, G. [Trento Univ. (Italy). Dip. di Ingegneria Civile Ambientale

    1996-04-01

    The results of a pilot experimental study on the disinfection of treated municipal wastewater to be used in agriculture are presented. A comparative evaluation has been carried out on two parallel pilot-scale disinfection plants using respectively ozone and peracetic acid. After a preliminary sand filtration pilot unit. Both processes showed the capability of meeting the Italian standards for agricultural reuse, but the disinfection process with ozone required much higher doses than the one with peracetic acid, probably because of the higher reactivity of ozone, if compared to peracetic acid with the organic matter present in wastewater. Further research is needed in order to evaluate the efficiency of peracetic acid applied to microorganism different from the bacterial ones and to identify nature and consequences of possible disinfection by products.

  13. DETERMINACIÓN DE RESIDUOS DE GLIFOSATO Y DE SU METABOLITO ACIDO AMINOMETILFOSFONICO EN AGUAS MEDIANTE CROMATOGRAFIA LIQUIDA DE ALTA EFICIENCIA CON DERIVACION POSCOLUMNA Y DETECCION POR FLUORESCENCIA

    Directory of Open Access Journals (Sweden)

    Hugo A Rodríguez

    2010-11-01

    Full Text Available El glifosato es un herbicida no selectivo,ampliamente utilizado en el mundo para controlar malezas anuales y perennes. Su principal metabolito en suelos y aguas es el ácido aminometilfosfónico (AMPA formado por la acción de microorganismos. Este herbicida se utiliza en Colombia en altas dosis para la erradicación de cultivos ilícitos de coca y amapola, y como madurante en caña de azúcar, constituyendo un problema ambiental y social en el país, y haciéndose necesaria la evaluación de residuos de glifosato y su metabolito en diferentes matrices. En este trabajo se validó una metodología analítica para determinar residuos de glifosato y de su metabolito AMPA en aguas de influencia de algunas regiones colombianas. El procedimiento experimental comprende dos pasos principales: el primero es un paso de limpieza, extracción y concentración en fase sólida; el Segundo corresponde a la separación, identificación y cuantificación de los compuestos mediante Cromatografía Líquida de Alta Eficiencia (CLAE con derivación poscolumna y detección por fluorescencia. Los resultados de la validación muestran que la metodología es específica, selectiva, precisa y robusta en un rango lineal entre 10 y 750 /xg/L, con límites de detección de 0,8 /xg/L y límites de cuantificación de 2 /ig/L para los dos analitos. Las recuperaciones se encuentran en el orden del 73% para glifosato y del 70% para el AMPA. Además, se muestran los resultados de análisis de aguas tomadas en algunas zonas del país donde se aplica glifosato en diferentes dosis con diferentes propósitos, encontrándose residuos del herbicida y de su metabolito en concentraciones por encima de los valores permitidos en aguas potables para plaguicidas de categoría toxicológica IV, caso del glifosato, de acuerdo con la legislación colombiana

  14. The dynamics of acetic acid in the anaerobic treatment of abattoir sewage; Dinamica del acido acetico en la depuracion anaerobia de aguas residuales de mataderos

    Energy Technology Data Exchange (ETDEWEB)

    Vazquez Borges, E.; Acosta Viana, K. [Universidad Autonoma de Yucatan. Mexico (Mexico)

    1999-05-01

    The purpose of this experiment was to examine the production and consumption of acetic acid during the anaerobic treatment of sewage from a municipal abattoir. The experiment studied a 20-litre UASB reactor under three hydraulic retention time (HRT) conditions-4 days, 2.5 days and 1.6 days-measuring the acetic acid concentration in the reactor in fluent and effluent. The results obtained during the experiment with the three different HRTs are reported. The highest percentages of acetic acid removed ( an average of 44%) were obtained with an HRT of 4 days. The amount of acetic acid removed with and HRT of 2.5 days was 27%. (Author) 18 refs.

  15. Removing volatile fatty acids during the anaerobic treatment of pig sewage; Remocion de acidos grasos volatiles durante el tratamiento anaerobio de aguas residuales porcicolas

    Energy Technology Data Exchange (ETDEWEB)

    Vazquez Borges, E.; Mendez Novelo, R.; Magana Pietra, A.; Partinez Pereda, P.; Fernandez Villagomez, G. [Facultad de Ingenieria, Universidad Atuonoma de Yucatan. Mexico (Mexico)

    1997-06-01

    This study examined the behaviour of a hybrid anaerobic digester in treating pig farm sewage. The experimental model consisted of a 208-litre UASB reactor at the bottom and a 195-litre high-rate sedimentator at the top. The digester was installed on a pig farm and its efficiency in removing volatile (acetic and propionic) fatty acids (VFA) was determined with hydraulic retention time (HTR) as the critical parameter for evaluating the anaerobic system`s performance. The results obtained with the five different HRTs used during the experiment are reported. The highest removal rates were obtained with an HRT of 2.8 days: 98% in the UASB, 28% in the sedimentator and 98% in the digester as a whole. An HRT of 1 day gave VFA removal rates of 40%, 12% and 50% in the UASB reactor sedimentator and digest respectively. (Author) 16 refs.

  16. Elution of nickel ions from alginate beads in an acid media; Elucion de iones de niquel desde esferas de alginato en un medio acido

    Energy Technology Data Exchange (ETDEWEB)

    Aracena, A.; Carcamo, F.; Jerez, O.; Constanzo, R.

    2016-05-01

    Elution of nickel ions from alginate beads was studied in a temperature range of 2 to 80 degree centigrade and a sulfuric acid concentration between 0.005 to 2.5 g L{sup -}1. The elution mechanism was established by ion exchange between nickel and ions protons, obtaining a value of 93% elution at a temperature of 80 degree centigrade and a H{sub 2}SO{sub 4} concentration of 0.25 g L{sup -}1. The influence of other acids on nickel elution was also studied. The nickel elution rate was significantly influenced by temperature and concentration of H{sub 2}SO{sub 4}. Elution kinetics of nickel ions was studied, and the 1-(1-α){sup 1}/3=k{sub a}ppt model properly described the kinetics of this reaction. The dependence of nickel elution on the sulfuric acid concentration was of the order of 0.33. Moreover, the intrinsic rate constants were determined and an activation energy value of 54.5 kJ mol{sup -}1 was obtained for the temperature range studied. The results indicated that the nickel elution is a process controlled by chemical reactions. (Author)

  17. Degradation of polylactic acid (Pla) at different doses of gamma radiation; Degradacion del acido polilactico (PLA) a diferentes dosis de radiacion gamma

    Energy Technology Data Exchange (ETDEWEB)

    Castillo R, Y.

    2015-07-01

    The excessive use of polymers such as polyethylene (PET), polystyrene (Ps) and recently the polylactic acid (Pla) that take more than 20 years to degrade, have caused great pollution in the environment. In this study the effects of gamma radiation in the Pla to different doses were studied, in order to reduce the degradation time of this polymer. The changes in physico-chemical structure of Pla during radiation were studied by thermo-gravimetric/Mass analysis; differential scanning calorimetry; scanning electron microscopy; X-ray dispersive analysis; infrared spectroscopy; X-ray diffraction and mechanical tests of hardness, elasticity and deformation. With scanning electron microscopy, the morphology of the Pla surface unirradiated was observed, in which an apparently smooth surface was observed, after changes that had the Pla when irradiated also was observed, where the effects of radiation were observed in form of scratch, agglomeration and small fractures. By X-ray dispersive analysis was determined and verified the elemental chemical composition of the Pla; as expected the tests showed only carbon, oxygen and hydrogen. With thermo-gravimetric/Mass analysis the decomposition temperatures of Pla were determined, identifying that the degradation compounds are CO, CO{sub 2} and CH{sub 4}. With infrared spectrometry the major peaks of Pla were observed before and after being irradiated with increasing of radiation dose the intensity of the bands decreased. Also by X-ray diffraction was observed that the polymer is an amorphous material. The mechanical tests indicate that the values of each of the tests decrease significantly with increasing the radiation dose. (Author)

  18. Mechanical properties of poly(N-isopropylacrylamide-Co-itaconic acid) hydrogels; Propiedades mecanicas de hidrogeles de poli(N-sopropilacrilamida-Co-acido itaconico)

    Energy Technology Data Exchange (ETDEWEB)

    Valderruten, N. E.; Quintana, J. R.; Katime, I.

    2001-07-01

    It is well known that polymers of N-isopropylacrylamide (NIPA) show lower critical solution temperature (LCST) behavior in water and its gels have a volume phase transition at about 34 degree centigree in water. In this study, we reported the polymerization of NIPA in the presence of N,N methylenebisacrylamide (BIS). Poly(N-isopropylacrylamide) and poly(N-isopropylacrylamide-co-itaconic acid) hydrogels were obtained by swelling the resultant solid xerogels to equilibrium in water. The effects of monomer composition and concentration of added cross-linking agent on the swelling behavior and mechanical properties of these hydrogels at 22 and 37 degree centigree were investigated, the latter involving measurements of shear in a DMTA system. The storage moduli at 22 degree centigree lay within the range 9.08-5.08 KPa. At a fixed BIS concentration, an increase from 22 to 37 degree centigree resulted in an increase in the shear moduli and the effective crosslinking density (v{sub e}) and a decrease in the interaction parameter hydrogel/water, {chi}. (Author) 6 refs.

  19. Estudio experimental para la obtención de dióxido de titanio a partir de ilmenita vía acido clorhídrico

    Directory of Open Access Journals (Sweden)

    Pedro Hernández

    2010-07-01

    Full Text Available Una ilmenita colombiana con un tamaño de partícula que pasa malla 100, se lixivió con soluciones de ácido clorhídrico cuyas concentraciones oscilaron entre 17% y el 41% (p/v, en relaciones estequiométricas de 1.0 a 2.5 veces, temperaturas entre 75°C y lOrC y tiempos de 1 a 5 horas. La mezcla resultante se filtró obteniéndose un licor que contenía entre 70% y 80% del TiO^ presente en la ilmenita, el cual se hidrolizó térmicamente. El producto final fue obtenido por calcinación a 900°C y posee un contenido de TiO^ mayor del 97%.

  20. Evolution of biochemical parameters in irradiated fishes: Serum proteins and intestinal nucleic acids; Evolucion de parametros bioquimicos en peces irradiados: Proteinas en suero y acidos nucleicos en intestino

    Energy Technology Data Exchange (ETDEWEB)

    Garces, F.; Andres, P.; Davila, C. A.

    1976-07-01

    In sublethal gamma-irradiated C. auratus, a sudden decrease of total serum protein concentration and a preferential descent of the low molecular weight gamma-globulin fraction have been observed. These effects are transient and after different latent periods dependent on doses, normal values are recovered, A temporal failure of a vascular permeability regulation system is probably implied. The DMA depolymerization. observed in the intestine indicates the action of radio-induced DNA degradation mechanisms since this effect is independent on doses. (Author) 29 refs.

  1. Ação do acido pteroílglutâmico sobre o peso e a fosfatase alcalina do rim

    Directory of Open Access Journals (Sweden)

    Gilberto G. Villela

    1948-12-01

    Full Text Available O APG ministrado subcutaneamente a camondongos normais em injeção unica após 24 hs produz um aumento do peso total dos rins e uma baixa da fosfatase alcalina destes orgãos. Os valores normais foram baseados em experiencias feitas em 54 camondongos e comparados com outros obtidos com 88 camondongos injetados com doses crescentes de APG (0,5~500mg/k. A fosfatase alcalina foi determinada por uma modificação do metodo colorimetro de King & Armstrong. A retenção e precipitação do APG nos estudosrenais parece ser responsavel pelo aumento de peso e a abaixa das fosfatase dos rins.PGA when administered subcutaneously into normal mice in a single injection produces after 24 hours an affective increase of the total weight and a decrease of the "alkaline" phosphatase of the kidneys. Normal values based on 54 mice are reported and compared with those obtained from 88 mice injected with graded doses of PGA (0.5mg/Kg to 500mg/Kg body weight. The "alkaline" phosphatase was determined by a slight modification of the colorimetric method of king & Armstrong using disodium phenylphosphate as a substrate. It is suggested that the retention and precipitation of PGA in the renal tubuli could be responsible for the increased weight and decreased phosphatase activity of the kidneys.

  2. Radioprotection potential of the ascorbic acid on the carrageenan used as food additive; Potencial radioprotetor do acido ascorbico sobre a carragenana utilizada como aditivo alimenticio

    Energy Technology Data Exchange (ETDEWEB)

    Aliste, Antonio Joao; Mastro, Nelida Lucia del [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil)]. E-mail: ajaliste@net.ipen.br; nlmastro@net.ipen.br

    2002-07-01

    Carrageenans are a group of natural carbohydrates that are present in the structure of certain varieties of red algae (Rhodophyceae). They are used in emulsions, for syneresis control and to grow up, to promote adhesiveness and dispersion. In the industry of foods they can be used for instance, as thickness and gelling agents, alone or together with other additives. The processing of foods by radiation is increasing considerably, because the efficiency of the process in the industrial decontamination of products. The objective of this work was to study the action of the ascorbic acid as potential radioprotector of the carrageenan against {sup 60} Co gamma radiation effects, using the viscosity as parameter. Samples of commercial carrageenan dissolved at 1,0% were irradiated in the presence or not of ascorbic acid, with doses of 0.0 kGy; 1.0 kGy; 2.5 kGy; 5.0 kGy and 10.0 kGy. After the irradiation the relationships viscosity/dose were established for the temperature of 60 deg C. For the dose of 10.0 kGy a better protecting effect of the ascorbic acid on the carrageenan was seen. The implications of the use of this antioxidant is discussed as a form of minimizing the effect of the radiation in irradiated foods. (author)

  3. RELACION DEL ESTRES OXIDATIVO CON EL PERFIL DE ACIDOS GRASOS DE HIGADO Y TEJIDO ADIPOSO EN PACIENTES OBESOS CON ENFERMEDADES DE HIGADO GRASO NO ALCOHOLICO.

    OpenAIRE

    PETTINELLI ROCHA, PAULINA PILAR

    2004-01-01

    La enfermedad de hígado graso no alcohólico (HGNA) es de etiología multifactorial que incluye la participación de factores como aumento del estrés oxidativo y preexistencia de anormalidades metabólicas, incluyendo un metabolismo alterado de los ácidos gra 61p.

  4. Polyesters production from the mixture of phthalic acid, terephthalic and glycerol; Producao de poliesteres a partir da mistura de acido ftalico, tereftalico e glicerol

    Energy Technology Data Exchange (ETDEWEB)

    Carvalho, A.L.S.; Oliveira, J.C.; Miranda, C.S.; Boaventura, J.S.; Jose, N.M., E-mail: adrianaequfba@gmail.co [Universidade Federal da Bahia (GECIM/UFBA), Salvador, BA (Brazil). Inst. de Quimica. Grupo de Energia e Ciencias dos Materiais; Carvalho, R.F. [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil). Escola Politecnica. Curso de Mestrado em Engenharia Ambiental Urbana

    2010-07-01

    Glycerin, a byproduct of biodiesel is currently an environmental and economic problem for producers of this renewable fuel in Brazil and in others parts of the world. In order to offer new proposals for recovery, it is used for the manufacture of polyesters used in applications in diverse areas such as construction and automobile industry. This work reports the production of polymer from the mixture of terephthalic and phthalic acid in three different proportions. The polyesters showed good thermal stability, analyzed by TGA and DSC, with an increase proportional to the terephthalic acid content. The X-ray diffraction patterns show that the samples are semi crystalline polymers. The micrographs indicated the presence of a smoother surface in the polyester that has a larger amount of phthalic acid, as reported in the literature. Therefore, the materials showed good thermal properties and morphological characteristics, so it consists in a new alternative to use glycerin. (author)

  5. Efecto de enjuagues de acido hipocloroso en el pH de la saliva: estudio in vitro.(CIENCIAS BASICAS, BIOTECNOLOGIA Y BIOINFORMATICA)

    National Research Council Canada - National Science Library

    Lafaurie Villamil, Gloria Ines; Buitrago Ramirez, Diana Marcela; Gualtero Escobar, Diego Fernando; Trujillo Perez, Diego Alejandro; Calderon Robles, Justo

    2015-01-01

    .... El potencial uso de enjuagues con HOCl debe valorarse para establecer si afecta el pH y las propiedades amortiguadoras de la saliva que favorezcan procesos de desmineralizacion dental. Objetivo...

  6. PRODUCCIÓN DE ACIDO CLAVULÁNICO POR FERMENTACIÓN DE Streptomyces clavuligerus: EVALUACIÓN DE DIFERENTES MEDIOS DE CULTIVO Y MODELADO MATEMÁTICO

    Directory of Open Access Journals (Sweden)

    CLAUDIA PATRICIA SANCHEZ HENAO

    2012-01-01

    Full Text Available El ácido clavulánico (AC es un antibiótico b-lactámico con una potente capacidad inhibidora de la actividad b-lactamasa. En el presente trabajo se evaluaron cuatro medios de cultivo reportados en la bibliografía y uno propuesto por los autores, para la producción de AC. Se evaluó también la concentración de glicerol adecuada para el medio seleccionado y con base en los resultados obtenidos se realizó una evaluación de la producción de AC en un biorreactor de laboratorio. Se propuso un modelo matemático y se evaluó su ajuste a los resultados experimentales. Se observó que los medios complejos con presencia de una mezcla de aminoácidos libres, son adecuados para la producción de AC. El glicerol presentó un valor óptimo frente a la producción de AC en 50 g.L-1 y se observó el efecto inhibitorio a concentraciones de 100 g.L-1. Con el medio complejo y 50 g.L-1 de glicerol, la concentración de AC alcanzada fue de 994 mg.L-1. El modelo matemático propuesto que incluye una cinética tipo Contois para la biomasa y una cinética de formación de producto parcialmente asociado al crecimiento, presentan un ajuste significativo con un 95% de nivel de confianza.

  7. The importance of the fatty acids in breast milk and in lacteal formulae; La importancia de los acidos grasos en la leche materna y en las formulas lacteas

    Energy Technology Data Exchange (ETDEWEB)

    Vega, S.; Gutierrez, R.; Radilla, M.; Ramirez, A.; Perez, J. J.; Schettino, B.; Ramirez, M. L.; Ortiz, R.; Fontecha, J.

    2012-11-01

    The best choice for feeding the newborn child is breast milk, and when it is not possible to breast feed a baby, the breast milk is replaced by lacteal formula, which is why numerous studies focus their attention on the analysis of the diverse components of baby formula as well as functions in the breast fed baby. Fatty acids are components of great nutritional importance in the fetus and in the newborn child. Nowadays it is estimated that the fetus, during the last trimester of the gestational period and the newborn child, during the first six months of life, need a great contribution of araquidonic and docosahexaenoic acids, due to the fact that the speed of transformation of the predecessors to the hepatic level are not sufficient to cover the metabolic requirements of these fatty acids and it is the mother who contributes them through placental transport during gestation and her milk during lactation. The Organization of Food and Agriculture (FAO), the World Health Organization (WHO), the European Society of Gastroenterology, Hepato logy and Pediatric Nutrition (ESPGHAN) and the American Academy of Pediatrics recommend that lacteal formula imitate the composition of the breast milk, especially in the fatty polyunsaturated acids (PUFA). (Author) 61 refs.

  8. Sprayed microspheres of poly(lactic acid) obtained with calcium compounds; Microesferas aspergidas de poli(acido latico) obtidos com compostos de calcio

    Energy Technology Data Exchange (ETDEWEB)

    Goncalves, Raquel P.; Picciani, Paulo H. de Souza; Dias, Marcos L., E-mail: raquelpires@ima.ufrj.br [Instituto de Macromoleculas - Universidade Federal do Rio de Janeiro - UFRJ, Rio de Janeiro, RJ (Brazil)

    2011-07-01

    In this work PLLA and PDLA were synthesized using calcium methoxide (Ca(OMe){sub 2}) as initiator. This compound shows good activity in the bulk polymerization of L-lactide (LLA) and D-lactide (DLA) producing polymers with average molecular weight up to 22,300 g/mol, but with microstructure containing a significant amount of estereoerros, as revealed by {sup 13} C NMR. Block copolymers containing blocks of L-and D-lactic acid were also prepared, using the method of sequential addition of LLA and DLA in an attempt to obtain stereo complexes. Analyses of scanning electron microscopy (SEM) revealed that the polymers obtained with catalysts of calcium produced PLA microspheres with diameters of around 5 {mu}m via electro spray technique. (author)

  9. EFECTO NEUROPROTECTOR DE LA HIPERTERMIA SOBRE EL ESTRÉS OXIDATIVO ASOCIADO A LA TOXICIDAD DEL ACIDO 3-NITROPROPIÓNICO

    OpenAIRE

    Guerrero Linares, Israel

    2012-01-01

    La hipertermia activa mecanismos de protección que podrían tener un beneficio terapéutico, en particular en aquellas enfermedades que comparten como factor común una falla crónica en al metabolismo energético (Karunanithi et al., 1999; Franklin et al., 2005; Neal et al., 2006). El ácido 3-nitropropiónico (3-NP) es un inhibidor del complejo II de la cadena transportadora de electrones mitocondrial, que tiene la capacidad de inactivar irreversiblemente la enzima succinato desh...

  10. p-Coumaric acid biodegradation improvement by bacterial selection; Estrategia para la mejora de la degradaciond el acido p-cumarico mediante seleccion bacteriana

    Energy Technology Data Exchange (ETDEWEB)

    Otal, E.; Arnaiz, C.; Gutierrez, J. C.; Lebrato, J. [Universidad de Sevilla, Sevilla (Spain)

    2003-07-01

    Over the last years, the treatment of wastewaters containing recalcitrant organic compounds by means of integrated chemical-biological processes has received a lot of attention. Nevertheless, studies with synthetic waters with acid p-coumaric showed that the chemical treatment before the biological one did not improve its degradation. In this work, we have selected several bacterial strain in order to obtain an inoculum with a high degradative potential of this compound and its intermediates from the chemical pre-treatment. (Author) 10 refs.

  11. Effect of succinic acid concentration in poly(glycerol citrate/succinate) properties; Efeito da concentracao do acido succinico nas propriedades do poli(glicerol citrato/succinato)

    Energy Technology Data Exchange (ETDEWEB)

    Brioude, Michel M.; Guimaraes, Danilo H.; Fiuza, Raigenis P.; Jose, Nadia M. [Universidade Federal da Bahia - UFBA, Instituto de Quimica, Salvador, BA (Brazil)

    2011-07-01

    In this work were prepared and characterized polymer based on glycerol, citric and succinic acid, in three different ratios to evaluate the effect of succinic acid concentration in materials properties. The polymers were obtained by polycondensation reaction between polyol and poly acids, and were characterized by X-ray diffraction (XRD), infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning differential calorimetry (DSC), scanning electron microscopy (SEM). The materials are amorphous polyesters and its thermal and morphological properties change depending on the succinic acid concentration. (author)

  12. Effect of the temperature and oxalic acid in the uranyl sorption in zircon; Efecto de la temperatura y acido oxalico en la sorcion de uranilo en circon

    Energy Technology Data Exchange (ETDEWEB)

    Ordonez R, E.; Almazan T, M. G.; Garcia G, N. [ININ, Departamento de Quimica, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico); Hernandez O, R., E-mail: eduardo.ordonez@inin.gob.mx [Instituto Tecnologico de Veracruz, Ingenieria Quimica, Miguel Angel de Quevedo No. 2779, 91860 Veracruz (Mexico)

    2012-10-15

    In this work the results of the temperature effect study are presented on uranyl solutions adsorbed on zirconium silicate (ZrSiO{sub 4}) and also on the compounds formed in surface with oxalic acid. The adsorption isotherms of uranyl on hydrated zircon with NaClO{sub 4} 0.5 M, show an increase of the uranyl sorption efficiency when increasing the temperature from 20 to 4 C with a sudden descent in this efficiency when changing the temperature at 60 C. The uranyl sorption efficiency increases to hydrate the zircon with a solution of oxalic acid 0.1 M, maintaining the same tendency regarding to the temperatures of the sorption in medium NaClO{sub 4} 0.5 M. The complex formation in the zircon surface with organic acids of low molecular weight increases the fixation of the uranyl in solution due to the formation of ternary systems, in the order Zircon/A. Organic/Uranyl, without altering their response to the temperature. (Author)

  13. Myrsinoic A acid and its derivative: in vitro inhibitors of photosynthesis; Acido myrsinoico A e derivado: inibidores da fotossintese in vitro

    Energy Technology Data Exchange (ETDEWEB)

    Burger, Marcela Carmen de M.; Oliveira, Gracielle S. de; Menezes, Antonio Carlos S. [Universidade Estadual de Goias, Anapolis, GO (Brazil). Unidade Universitaria de Ciencias Exatas e Tecnologicas; Vieira, Paulo Cezar; Silva, Maria Fatima das G.F. da [Universidade Federal de Sao Carlos (UFSCar), SP (Brazil). Dept. de Quimica; Veiga, Thiago A.M., E-mail: tveiga@unifesp.br [Universidade Federal de Sao Paulo (UNIFESP), SP (Brazil). Inst. de Ciencias Ambientais, Quimicas e Farmaceuticas. Dept. de Ciencias Exatas e da Terra

    2012-07-01

    Myrsinoic A acid, isolated from Myrsine cuneifolia and its hydrogenated derivative had their effect on photosynthesis tested. The compounds inhibited the electron flow (basal, phosphorylating and uncoupled) from water to methyl viologen; therefore, they act as Hill reaction inhibitors in spinach thylakoids. They inhibited partial reactions of PSII electron flow from water to 2,5-dichloro-1,4-benzoquinone, from water to sodium silicomolybdate, and partially electron flow from diphenylcarbazide to 2,6-dichloroindophenol. Their inhibition sites were at the donor and acceptor sides of PSII, between P{sub 680} and Q{sub A}. Chlorophyll {alpha} fluorescence measurements confirmed the behavior of the compounds (pool of quinones). (author)

  14. Canaric acid (3,4-seco-lupane derivative) isolated from propolis of Ceara, BR; Acido canarico (3,4-seco derivado do lupano) em propolis do Ceara

    Energy Technology Data Exchange (ETDEWEB)

    Albuquerque, Irineu L. de; Alves, Leonardo A.; Lemos, Telma L.G.; Monte, Francisco J.Q. [Universidade Federal do Ceara (UFC), Fortaleza, CE (Brazil). Dept. de Quimica Organica e Inorganica]. E-mail: tlemos@dqoi.ufc.br; Braz-Filho, Raimundo [Universidade Estadual do Norte Fluminense (UENF), Campos dos Goytacazes, RJ (Brazil). Centro de Ciencias e Tecnologia. Setor de Produtos Naturais

    2007-07-15

    Phytochemical investigation of a propolis sample from Alto Santo - Ceara, Brazil, allowed identification of triterpenes (lupeol, lupenone, germanicone, Canaric acid) and flavonoids (quercetin, kaempferol and acacetin), which were identified by spectroscopic data (IR, MS, and NMR, including 2D techniques). This is the first report of Canaric acid in propolis. Propolis extract and flavonoids showed antioxidant activity using a DPPH radical scavenging assay. (author)

  15. Estudio experimental para la obtención de dióxido de titanio a partir de ilmenita vía acido clorhídrico

    OpenAIRE

    Pedro Hernández; Andrés Hurtado; Luis Peñaloza; Jacqueline Romero

    2010-01-01

    Una ilmenita colombiana con un tamaño de partícula que pasa malla 100, se lixivió con soluciones de ácido clorhídrico cuyas concentraciones oscilaron entre 17% y el 41% (p/v), en relaciones estequiométricas de 1.0 a 2.5 veces, temperaturas entre 75°C y lOrC y tiempos de 1 a 5 horas. La mezcla resultante se filtró obteniéndose un licor que contenía entre 70% y 80% del TiO^ presente en la ilmenita, el cual se hidrolizó térmicamente. El producto final fue obtenido por calcinación a 900°C y po...

  16. Oxidative stability of biodiesel from soybean oil fatty acid ethyl esters; Estabilidade oxidativa de biodiesel de esteres etilicos de acidos graxos de soja

    Energy Technology Data Exchange (ETDEWEB)

    Ferrari, Roseli Ap.; Oliveira, Vanessa da Silva; Scabio, Ardalla [Universidade Estadual de Ponta Grossa (UEPG), PR (Brazil). Dept. de Engenharia de Alimentos]. E-mail: ferrarir@uepg

    2005-06-01

    Biodiesel consists of long-chain fatty acid esters, derived from renewable sources such as vegetable oils, and its utilization is associated to the substitution of the diesel oil in engines. Depending on the raw material, bio diesel can contain more or less unsaturated fatty acids in its composition, which are susceptible to oxidation reactions accelerated by exposition to oxygen and high temperatures, being able to change into polymerized compounds. The objective of this work was to determine the oxidative stability of bio diesel produced by ethanolysis of neutralized, refined, soybean frying oil waste, and partially hydrogenated soybean frying oil waste. The evaluation was conducted by means of the Rancimat equipment, at temperatures of 100 and 105 deg C, with an air flow of 20 L h{sup -1}. The fatty acid composition was determined by GC and the iodine value was calculated. It was observed that even though the neutralized, refined and waste frying soybean oils presented close comparable iodine values, bio diesel presented different oxidative stabilities. The bio diesel from neutralized soybean oil presented greater stability, followed by the refined and the frying waste. Due to the natural antioxidants in its composition, the neutralized soybean oil promoted a larger oxidative stability of the produced bio diesel. During the deodorization process, the vegetable oils lose part of these antioxidants, therefore the bio diesel from refined soybean oil presented a reduced stability. The thermal process degrades the antioxidants, thus the bio diesel from frying waste oil resulted in lower stability, the same occurring with the bio diesel from partially hydrogenated waste oil, even though having lower iodine values than the other. (author)

  17. Selection of refractory materials for acid tanks at the CSN continuous pickling line; Selecao de materiais refratarios para tanques de acido das linhas de decapagem continua da CSN

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Sidiney Nascimento; Marques, Oscar Rosa; Bueno, Mauricio Chaves [Companhia Siderurgica Nacional, Volta Redonda, RJ (Brazil); Longo, Elson; Silva Pinheiro, Adriano da [Sao Carlos Univ., SP (Brazil). Dept. de Quimica

    1997-12-31

    Aiming at the revamping of the CSN continuous pickling line 4 acid tanks, a Post Mortem study of the refractory lining was carried out. The collected samples were characterized through techniques such as chemical analysis, mercury porosimetry, X-ray diffraction and scanning electronic microscopy. Trying to reproduce the operational conditions closely, laboratorial simulations were carried out. Such simulations lead to the addition of some alterations on the test method proposed by ABNT. Primarily, the sulfuric acid was substituted by hydrochloric acid (30%), containing iron in solution (130g/l). As result, it was concluded that acid resistant refractories containing a smaller alumina and /or corundum and mullite concentrations, presenting a smaller open porosity and average pore diameter, have a better performance face to corrosion due to hydrochloric acid solution. In addition, abrasion wear resistance tests, according to the ASTM-G65-85 standard were carried out in order to select different materials to the acid tanks cells. (author) 3 refs., 5 figs., 12 tabs.

  18. Analytical methods for 2,4-D (Dichlorophenoxyacetic acid) determination; Metodos analiticos para la determinacion del 2,4-D (Acido diclorofenoxiacetico)

    Energy Technology Data Exchange (ETDEWEB)

    Martinez G, M.S.M

    1999-06-01

    The 2,4-D herbicide is one of the main pesticides for controlling the bad grass in crops such as the water undergrowth. In Mexico the allowed bound of this pesticide is 0.05 mg/l in water of 2,4-D so it is required to have methods trusts and exacts, which can used in order to detected low concentration of it. In this work we show some for the conventional techniques and for establishing the 2,4-D concentrations. The UV-Vis spectrometer and liquids chromatography due that they are the most common used nowadays. Beside, we introduce a now developed technique, which is based on the neutronic activation analysis. Though use of the UV-Vis spectrometer technique it was possible target the concentrations interval between 1 and 200 mg/l. In the liquids chromatography interval was between 0.1 and 0.9, and by the neutronic activation analysis the interval was between 0.01 and 200 mg/l. (Author)

  19. Use of chemical pre-treatment based chromic acid; Uso de pre-tratamento quimico a base de acido cromico. Beneficios versus desvantagens

    Energy Technology Data Exchange (ETDEWEB)

    Campos, Paulo Henrique Leite [TENARIS CONFAB S.A., Pindamonhangaba, SP (Brazil); Bibiano, Paulo de Tarso [SOCO-RIL do Brasil S.A., Pindamonhangaba, SP (Brazil); Koebsch, Andre; Mollica, Eduardo de Oliveira [PETROBRAS, Rio de Janeiro, RJ (Brazil)

    2005-07-01

    In this work were going compared the polyethylene and FBE coatings performances in triple layer for tubes done with and without the presence of the pre-treatment chemist with chromic acid of the tube surface. The performance test chosen for accomplishes the comparison was the cathodic disbondment and hot water soak, for being this the test that has objective to improve the performance with the chromic acid application. The obtained results were going extracted of a factory database of TENARIS CONFAB S.A. in Pindamonhangaba - Sao Paulo. The adopted technical specification like reference for the tried coatings belonged to PETROBRAS S.A. Were compared also tests results of jobs using chromate and jobs that were not used pre-treatment. (author)

  20. Kraft pulp bleaching with molybdenum activated acid peroxide (P{sub Mo} stage); Branqueamento de polpa celulosica kraft de eucalipto com peroxido acido ativado por molibdenio

    Energy Technology Data Exchange (ETDEWEB)

    Rabelo, Marcos Sousa [Servico Nacional de Aprendizagem Industrial (SENAI), Lauro de Freitas, BA (Brazil). Dept. Regional da Bahia; Silva, Vanessa Lopes; Barros, Denise Pires de; Colodette, Jorge Luiz [Universidade Federal de Vicosa (UFV), MG (Brazil). Dept. de Engenharia Florestal; Sacon, Vera Maria; Silva, Marcelo Rodrigues da [Votorantim Celulose e Papel, Jacarei, SP (Brazil)

    2009-07-01

    Optimum conditions to run the P{sub Mo} stage for bleaching eucalyptus kraft pulp were 90 deg C, pH 3.5, 2 h, 0.1 kg/t Mo and 5 kg/t H{sub 2}O{sub 2}. The P{sub Mo} stage efficiency increased with decreasing pH (1.5-5.5) and increasing temperature (75-90 deg C), time (2-4 h), and hydrogen peroxide (3-10 kg/t) and molybdenum concentration (0.1-0.4 kg/t). The implementation of the P{sub Mo} stage, as replacement for the A stage, decreased total active chlorine demand of the OAZDP sequence by 6 kg/t to reach 90% ISO, both in laboratory and mill scale. Such practice resulted in decreased bleaching chemical costs to produce fully bleached pulp of 90% ISO. (author)

  1. Radiological assessment occupational radionuclides in a phosphoric acid plant; Evaluacion radiologica ocupacional y distribucion de radionucleidos en una planta de acido fosforico

    Energy Technology Data Exchange (ETDEWEB)

    Bolivar, J. P.; Garcia-Tenorio, R.

    2008-07-01

    On the frame of a research project devoted to the control of the exposure due to natural radiation in several NORM industries located at the South of Spain, a detailed to the production of phosphoric acid has been performed. In addition, the behaviour along the mentioned process of the different radionuclides involved has been analysed. It has been concluded that the effective dose which can be received by the workers of the plant is clearly below 1 mSv/year. And it has been demonstrated that the main route of occupational exposure corresponds to the external radiation due mainly to the permanent presence of a radioactive contamination source in different zones of the plant. This contamination source is associated to the presence of scales in the inner surfaces of pipes and equipment as well as to the presence of sludges in the phosphoric acid storage tanks, which in both cases contain elevated concentrations of 226{sup R}a. Moreover, the 222{sup R}n concentrations inside the plant do not overpass 100 Bq/m{sup 3}, which not constitutes a radiological problem. (Author) 9 refs.

  2. Efecto de dos citoquininas, acido ascorbico y sacarosa en la obtencion de plantas in vitro de Sorghum bicolor para la formacion de callos

    National Research Council Canada - National Science Library

    de Jesus Martinez Medina, Silvio; Gomez Kosky, Rafael; Posada Perez, Laisyn; Barbon Rodriguez, Raul; Acosta Suarez, Maira; Reyes Vega, Maritza; Perez Benitez, Martha; Torres Rodriguez, Damaris; Pons Corona, Mileidys; La O Cardenas, Mariana; Aguilera Chavez, Annerys; Tejeda Gonzalez, Miguel

    2012-01-01

    .... Se tomaron semillas maduras de plantas que crecian en condiciones controladas, las que se desinfectaron y fueron colocadas a germinacion en un medio de cultivo con las sales MS, mioinositol 100 mg [L.sup.-1], sacarosa 3...

  3. Description and implementation of acid/base titrimetric techniques for process monitoring; Descripcion e implementacion de tecnicas titrimetricas acido/base para la monitorizacion de procesos

    Energy Technology Data Exchange (ETDEWEB)

    Marcelino Represa, M.; Guisasola i Canudas, A.; Casa Alvero, C.; Lafuente Sancho, F. J.

    2006-07-01

    The basis of titrimetric techniques is that the proton production (or consumption) rate can be indirectly measured with the amount of base (or acid) dosage necessary to maintain the pH at a certain setpoint value. Titrimetric measurements are very useful for the monitoring of any process that influences pH with simple equipment (an accurate pH control loop). This work describes the theoretical basis of titrimetric measurements and shows three examples of the application of titrimetric techniques for the process monitoring: CO{sub 2} absorption, nitrification and biological organic matter removal. (Author)

  4. Electrodialytic separation of Cu(II) and As(V) in acidic electrolytes; Separacion electrodialitica de Cu(II) y As(V) en electrolitos acidos

    Energy Technology Data Exchange (ETDEWEB)

    Ibanez, J. P.; Ipinza, J.; Cifuentes, L.

    2007-07-01

    The separation of copper and arsenic from acidic electrolytes by electrodialysis was investigated at room temperature. the effect of current density and pH was studied in a batch cell during 3 hours. The kinetic parameters showed that Cu(II) transport rate was 0.75 mol/m''2/h and the As(V) transport rate was 0.002 mol/m''2/h. An efficient separation between Cu(II) and As(V) was achieved; Generating a concentrated solution of copper with no arsenic, which was obtained independently of the electrolyte acidity and current density used. The effect of the arsenic speciation with pH is discussed as well. (Author) 23 refs.

  5. Behaviour of the 1-Ascorbic as supporting Electrolyte. Influence of the Magnesium Ion; Comportamiento del acido 1-Ascorbico como electrolito soporte influencai del ion magnesio

    Energy Technology Data Exchange (ETDEWEB)

    Alonso Lopez, J.

    1962-07-01

    The behaviour of 1-ascorbic acid, as supporting electrolyte of the uranyl ion in a 0{sub 1}-0.7 M concentration range, and the influence of pH on the diffusion current and half wave potential of 0,1 M uranyl ion is studied. The cathodic waves from 0 to -2,5 volts, with mercury dropping electrode are studied in fresh 0,1 M aqueous solution in presence of Mg{sup 2}+ and at 2,0-12 pH range. A kinetic current with a half wave potential of 0,85 v. vs. Hg. b.e. is obtained at pH> 9,5 appears a tilth wave a -0,60 v. The pH variation does not influence these potentials. (Author) 18 refs.

  6. Formation mechanism of manganese compounds in acidic electrolytes of copper; Mecanismo de la formacion de compuestos de manganeso en electrolitos acidos

    Energy Technology Data Exchange (ETDEWEB)

    Ipinza, J.; Ibanez, J. P.; Pagliero, A.; Vergara, F.

    2007-07-01

    The formation mechanism of manganese compounds in acidic electrolytes (180 g/l of H{sub 2}SO{sub 4}) was studied by potentiostatic experiments at 50 degree centigree. In the oxide layer on a PbCaSn anode, amorphous MnOOH was formed XRD showed that anodic slimes collected from the cell bottom after 3 h was made up of: {gamma}-MnO{sub 2} and {epsilon}-MnO{sub 2}. It was proved that the {epsilon} type oxide was formed by an electrochemical process and the {gamma} type oxide was formed by a pure chemical precipitation, the last one depends on the MnO{sub 4} concentration in the electrolyte. The electrochemical formation of MnOOH only depends on the concentrations of Mn''3+ in the electrolyte, and this amorphous compounds in the intermediate specie for generating {epsilon}-MnO{sub 2}. Fe''2+, in the presence of Mn''2+. inhibited the formation of both MnO{sub 2} oxides, and in the anode interface reduces PbO{sub 2} to PbSO{sub 4}, that reports in the anodic slime. furthermore, the presence of ferrous ion resulted in a better distribution of the manganese compounds and originates PbSO{sub 4} precipitates, which report on the slime. (Author) 25 refs.

  7. The impact of heavy and acid oil production in PETROBRAS downstream area; A influencia dos petroleos pesados e acidos no parque de refino da PETROBRAS

    Energy Technology Data Exchange (ETDEWEB)

    Perisse, Juarez Barbosa; Oddone, Maria Regina Rezende; Bela, Donizeti Aurelio Silva [PETROBRAS, Rio de Janeiro, RJ (Brazil)

    2004-07-01

    PETROBRAS is facing a great challenge processing heavy and acid oils. The low API of the more recent offshore discoveries leads to an increase in vacuum residue yields which is one important component of the fuel oil's 'pool'. The fuel oil demand is expected to decrease along the next years due to natural gas substitution and to environmental issues, generating exceeding fuel oil exportation at low prices. This paper will discuss World and PETROBRAS technological choices to process these oils meeting the required future demand and quality. A comparison among various residue conversion technologies is also presented in this paper focused on the reduction of fuel oil production and on the improvement of diesel / gasoline rate. Another important issue that will be discussed in this paper is related to the different solutions implemented all over the world to deal with the crude acidity problem and the solutions adopted by PETROBRAS. (author)

  8. Natural Radiation in byproducts of the production of phosphoric acid; Radiacao natural em residuos gerados no processo de producao de acido fosforico

    Energy Technology Data Exchange (ETDEWEB)

    Silveira, Marcilei A. Guazzelli da; Cardoso, L.L., E-mail: marcilei@fei.edu.br [Centro Universitario da FEI, Sao Bernardo do Campo, SP (Brazil); Medina, N.H. [Universidade de Sao Paulo (USP), Sao Paulo, SP (Brazil). Institutlo de Fisica

    2014-07-01

    Natural radiation is the largest source of radiation exposure to which man is subject. It is formed basically by cosmic radiation and the radionuclides present in the Earth crust, as {sup 40}K and the elements of the decay series of {sup 232}Th and {sup 238}U. Phosphate ores, which constitutes the raw material for the production of phosphoric acid, have a high rate of natural radiation from the decay series of {sup 232}Th and {sup 238}U. Phosphogypsum, which is naturally radioactivity, is a by-product of the production of phosphoric acid by the wet method. For each ton of phosphoric acid it is produced about 4.5 tons of phosphogypsum. This work presents the analysis of samples collected in all stages of the manufacturing process of phosphoric acid, which generates the phosphogypsum. Gamma-ray spectrometry was used to measure the concentration of the elements of the decay series of {sup 232}Th and {sup 238}U. All analyzed samples showed a high concentration of radionuclides, promoting the need for further steps in the process in order to reduce the presence of such radionuclides in the phosphogypsum. The results indicate the radionuclide {sup 238}U has higher contribution in some samples of the intermediate stages of the process. All samples exceeded the international average range of human exposure to terrestrial gamma radiation, which is 0.3 to 1.0 mSv/year. (author)

  9. Study of the desphosphatization process. The impact of nitrilotriacetic acid trisodium salt (NTA). Estudio del proceso de defosfatacion. Impacto de la sal tisodica del acido nitrilotriacetico SNTA

    Energy Technology Data Exchange (ETDEWEB)

    Peisajovich, A.; El Falaki, K.; Martin, G.

    1993-07-01

    In this paper we examined the effects of NTA on the removal of phosphorus process. The biological phosphorus removal process has been studied in the batch tests. This process indicated that there is a perturbation level (DD) of the phosphorus removal which is situated at 40 mg/g MVLSS. A dynamic lab-scale study showed a reduction of the nitrogen and phosphorus removal efficiency, ten days after the introduction of NTA in the influent water in concentration lower than DD. The precipitation of phosphate from wastewater has been examined using the Jar-Test method. The resultants of phosphate precipitation employed iron (III), aluminium (III) or lime did not reveal any differences in the efficiency between the coagulants. The present of NTA did not show a reduction of efficiency in the removal phosphorus process. (Author) 32 refs.

  10. Efeito do acido borico sobre a reação de formação da oxima da benzoina

    OpenAIRE

    Dal Magro,Jacir

    1993-01-01

    Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciencias Fisicas e Matematicas A reação entre a hidroxilamina e benzoína ocorre em duas etapas: formação de um intermediário de adição e a desidratação deste à oxima. A reação na presença de ácido bórico (0,01M) a pH 8,5 apresenta um aumento no valor de kobs em até l5 vezes. Este valor é maior na presença de ácido fenil bórico, onde a diferença atinge 28 vezes. Tampões que possuem pKas semelhantes não apresentam ne...

  11. Evaluation of ultrasonic technique to characterize the concentration of boric acid in liquid medium; Avaliacao de tecnica ultrassonica para medida de concentracao de acido borico em meio liquido

    Energy Technology Data Exchange (ETDEWEB)

    Kohara, Richard Yuzo Ramida

    2015-06-01

    This dissertation is to analyze the viability of using ultrasonic technique to characterize the concentration of boric acid in liquid medium non-invasively, therefore, ultrasonic tests were performed relating different boric acid concentrations with the travel time of the ultrasonic wave, also were evaluated factors able to mask the characterization of these concentrations by ultrasonic technique. The results showed that the ultrasonic technique allows the characterization of boric acid concentrations in liquid medium in very simple terms by the ultrasonic wave travel time, requiring further studies in complex conditions. (author)

  12. Hydrogen embrittlement in superaustenitic stainless steels welded unions in sulfuric acid; Fragilizacao por hidrogenio em juntas soldadas de acos inoxidaveis superausteniticos em acido sulfurico

    Energy Technology Data Exchange (ETDEWEB)

    Berthier, T. [Parana Univ., Curitiba, PR (Brazil). Lab. de Materiais e Tratamento de Superficies (LaMaTS)]. E-mail: thiana@demec.ufpr.br; Kuromoto, N.K. [Parana Univ., Curitiba, PR (Brazil). Lab. de Nanopropriedades Mecanicas; Paredes, R.S.C. [Instituto de Tecnologia para o Desenvolvimento (LACTEC), Curitiba, PR (Brazil)

    2003-07-01

    The embrittlement of the austenitic stainless steel by hydrogen has been known for more than four decades. Researches done into the behavior of the hydrogenated homogeneous structures, under cathodic charging at room temperature, have shown that the hydrogen induces phase transformations and nucleation of retarded superficial cracks during the outgassing which is followed by the end of the hydrogenation. The results obtained upon austenitic and superaustenitic stainless steels are few considering the changes produced in welded unions. The aim of this work is to evaluate mechanical properties of material and its relation to the nucleation of the cracks in the austenitic steels welds type AISI 904L submitted to hydrogenated solutions. The samples have been welded through the process MIG/MAG; the hydrogenation has been made catholically in a sulfuric acid solution of 1N, with variable time of 1 to 4 hours at the room temperature. An anode of platinum in and density of current 1000 A/m{sup 2} has been used. The outgassing has occurred at the room temperature. Many retarded superficial cracks with different morphologies have been observed. Regarding the hardness measure, major alterations in all the regions of the sample have not been noticed. (author)

  13. The influence of acid and base waste on the activated sludge system; Influencia de vertidos acidos y basicos sobre el sistema de fangos activados

    Energy Technology Data Exchange (ETDEWEB)

    Coello Oviedo, M. D.; Sales Marquez, D.; Quiroga Alonso, J. M.

    2003-07-01

    A study has been made of the effect of acid and base waste on the microorganisms in the activated sludge reactor. This effect was monitored using the classical control parameters (SVS and the percentage of organic matter eliminated) and by measuring the activity of the microorganisms (specific breathing rate and percentage of active cells). The results obtained indicate that the macrobiotic is affected at the extremes of the pH range (pH 4,5 and pH 10.5). The system's performance worsens and therefore the quality of the effluent fails to comply with European Directive 91/271/EEC. In the tests carried out with pH 6 and 9, the microorganisms activity declined at first,but the system eventually recovered and returned to levels of activity similar to those prior to the test. It was also found that deviations of the supply towards acid pH had a greater negative effect on the reactor than identical deviations towards baseness. (Author) 12 refs.

  14. Acid formic effect in zinc coatings obtained by galvanostatic deposition; Efeito do acido formico em revestimentos de zinco obtidos por deposicao galvanostatica

    Energy Technology Data Exchange (ETDEWEB)

    Lopes, C.; David, M.; Souza, E.C., E-mail: carolinalops@gmail.com [Universidade Federal da Bahia (UFBA), BA (Brazil). Escola Politecnica. Departamento de Engenharia Quimica

    2016-07-01

    Zinc deposits obtained from electrodeposition is widely used for the purpose of protecting steel substrates from corrosion. They are generally added to Zn deposition bath many additives for improving certain characteristics of the deposit. As far as is known there is no information in literature about the effect of formic acid in corrosion resistance of a Zn deposit. Because it is an acid additive, it has the use of cyclohexylamine, in order for the electrolytic bath continue with a pH equal to the one used commercially, around 5. The main goal of this study is analyze the effect of the formic acid addition in the corrosion resistance of an Zn electrodeposition obtained by galvanostatic deposition. The results obtained by performance tests, cyclic voltammetry and X-ray diffraction showed that the formic acid addition may be promising in combating the corrosion of materials. (author)

  15. Behaviour and reliability of lead-acid batteries in stand-alone photovoltaic systems; Comportamiento y durabilidad de baterias de plomo-acido en sistemas fotovoltaicos autonomos

    Energy Technology Data Exchange (ETDEWEB)

    Vela Barrionuevo, N.

    2007-07-01

    Vented stationary lead-acid batteries are currently the most commonly used type of accumulator in stand-alone PV systems. The state-of the art of the technology suggests that lead-acid batteries will maintain a predominant position in the PV market for the next years. Additionally to the specific operating requirements of batteries in PV systems, there are other questions not completely solved related to battery characterisation and testing methods for this type of application. The objective of this work is to contribute to the operational optimisation and reliability improvement of lead-acid batteries operating in stand-alone PV systems. This objective has been approached by means of eminently experimental works. These works are focused firstly on functional characterisation of batteries, with special emphasis on capacity and characteristic voltages study and secondly on degradation analysis of these batteries taking into account the specific working conditions of stand-alone PV systems which main characteristic is its wide variability of operational conditions (current rates, temperature and state of charge). In relation with battery characterisation, a procedure for the determination of the usable capacity of lead-acid batteries has been established and applied to a set of commercial batteries at different current rate and temperature conditions. From each battery experimental data and using a model equation describing the battery capacity as function of current rate and temperature, the corresponding parameters for each battery have been obtained. A comparative analysis of the model application to experimental data and data supplied by the manufacturer is included. Also, initial gassing voltage and end-of-charge voltage values have been measured at different current rate and temperature conditions for the whole set of batteries. Experimental values of voltage from each battery have been fitted with high degree of accuracy to simple mathematical expressions for both characteristic voltages as function of current rate and temperature. From the regression analysis, temperature coefficients have been obtained. To conclude the characterisation works, an study of charge voltage evolution and overall charge discharge efficiency at different operating conditions (current rate and temperature) combined with different initial test conditions and variations of state of- charge has been performed. It has been observed that battery voltage, in many cases, could not be indicative of its actual state of charge, instead of this a strong dependence on the voltage evolution on initial battery condition has been obtained. With respect to battery reliability, an analysis of failures and degradation mechanisms of lead-acid batteries under specific PV operation condition is presented. From this analysis we can conclude that the main causes of degradation of lead-acid batteries in PV systems are due to extended periods working at overcharge or over discharge conditions and typical cycling condition. Because of this, different accelerated battery tests have been developed to reproduce these degradation mechanisms. The objective of these procedures is to considerably reduce the tests duration without causing any alteration to the physical meaning of the actual degradation mechanism. Results of applying these accelerated degradation tests to two different batteries are presented. Finally, in basis of the obtained results, a general qualification test sequence for lead-acid batteries in PV stand-alone systems has been proposed. The proposed sequence includes individual specific test procedures for: technical specifications included in the documentation supplied with the battery, visual inspection, characterisation (full charge, capacity and efficiency) and reliability (overcharge, over discharge and cycling). (Author)

  16. Profile of ingested fatty acids and in the duodenal digest of steers fed different diets Perfil de ácidos graxos ingeridos e na digesta duodenal de novilhos recebendo diferentes dietas

    Directory of Open Access Journals (Sweden)

    Luís Fernando Glasenapp de Menezes

    2010-11-01

    ção de milheto (Pennisetum americanum, Leeke + capim-papuã, Brachiaria plantaginea. Foram utilizados seis novilhos mestiços Charolês × Nelore canulados no duodeno, em duplo quadrado latino 3 × 3. O consumo de matéria seca (MS foi semelhante entre os grupos (média de 4.037 g/dia, mas o consumo de ácidos graxos totais e de ácidos graxos saturados foi mais alto no grupo que recebeu silagem de forrageira tropical. Por outro lado, os animais que receberam a dieta convencional consumiram maior quantidade de ácidos graxos insaturados. A silagem de forrageira tropical proporcionou maior consumo de ácido vacênico (C18:1 t-11 e a de forrageira temperada maior consumo de ácido linoleico conjugado. O consumo dos ácidos graxos ômega-6 foi maior no grupo alimentado com a dieta convencional e o de ômega-3, no grupo alimentado com a dieta com forrageira tropical. O fluxo de ácidos graxos totais no duodeno não foi influenciado pelas dietas, mas em todos os grupos foi maior queo consumido. Animais que recebem concentrado na dieta apresentam maiores mudanças do perfil de ácidos graxos do alimento durante a fermentação ruminal. Dietas convencionais proporcionam maior consumo de ácidos graxos insaturados e disponibilidade mais alta de ácido vacênico no intestino delgado, mas não aumentam a oferta intestinal de ácido linoléico conjugado.

  17. Efecto in vitro del D-003 sobre la actividad enzimática de la 5-lipoxigenasa (5-LOX

    Directory of Open Access Journals (Sweden)

    Yohani Pérez Guerra

    Full Text Available Introducción: el D-003, mezcla de ácidos alifáticos primarios superiores purificada de la cera de la caña, inhibe la síntesis de colesterol. Trabajos recientes han demostrado que el D-003 resulta efectivo en modelos experimentales de osteoartritis y que inhibe la actividad de las enzimas COX1 y COX2, preferentemente la COX1, sin producir gastrotoxicidad. Ha sido referido que los inhibidores duales de las enzimas COX y 5-LOX presentan efectos antinflamatorios desprovistos de gastrotoxicidad o que incluso, pueden resultar gastroprotectores. De acuerdo con estos antecedentes, el D-003 podría ser un inhibidor dual de dichas enzimas. Objetivo: investigar el efecto in vitro del D-003 sobre la actividad enzimática de la 5-LOX, utilizando la fracción citosólica de leucocitos polimorfonucleares de ratas. Métodos: se utilizaron las condiciones de ensayo siguientes: fracción citosólica (50 µg de proteína disuelta en solución reguladora borato 0,2 mol/L (pH 9 y ácido linoleico (7,8-250 mmol/L como sustrato, ensayándose muestras paralelas incubadas con Tween-20/H2O (2 % (vehículo, D-003 (0,6-6 000 µg/mL o extracto de Perna canaliculus (50 µg/mL (sustancia de referencia. Se evaluó la actividad enzimática mediante el cambio de absorbancia a 234 nm producido por la formación de dienos conjugados y medido en espectrofotómetro UV-visible. Resultados: la adición de D-003 produjo una inhibición dosis dependiente de la actividad enzimática de la 5-LOX (r= 0,975; p< 0,05 (CI50= 23,06 µg/mL in vitro. La magnitud de esta inhibición fue moderada, ya que la inhibición máxima, alcanzada a partir de 1 250 µg/mL, resultó de solo un 30 %. Conclusiones: el estudio demuestra que el D-003 es capaz de inhibir la actividad enzimática de la 5-LOX in vitro, pero moderadamente.

  18. Fatty acid composition of soybean/sunflower mix oil, fish oil and butterfat applying the AOCS Ce 1j-07 method with a modified temperature program

    Directory of Open Access Journals (Sweden)

    Masson, L.

    2015-03-01

    Full Text Available Gas-Liquid Chromatography (GLC methods such as AOAC Fat in foods 966.06 (2005, AOCS Official Methods Ce 1h-05 (2005, Ce 1j-07 (2007, allow for analyzing the fatty acids (FAs in dietary fats using highly polar liquid phase capillary columns. However, there are still difficulties in completely separating butiric acid from solvent, FA critical pairs with similar polarity, conjugated linoleic acid (CLA isomers, and long chainpolyunsaturated FAs (LC-PUFAs. Therefore, the selection of the temperature program to be employed is important. This work aimed to improve the AOCS Ce 1j-07 Method for the FA composition of a mixture of soybean and sunflower oil, fish oil, and butterfat, using a modified temperature program, tested among five laboratories. It takes more time, but it allows to completely separate butyric acid from the solvent, trans-18:1 from cis-18:1, 20:1 isomers from 18:3 n-3, 22:1 n-9 from 20:4 n-6, 20:5 n-3 from 24:0 and the main CLA isomers, thus permitting FA quantification in fats and oils for different purposes such as nutritional labeling, quality control and research.Métodos por cromatografía gas-líquido, AOAC 966.06 (2005, AOCS Ce 1h-05 (2005, Ce 1j-07 (2007 permiten determinar ácidos grasos (AG en matrices grasas usando columnas capilares altamente polares y distintos programas de temperatura. No obstante, aún existen dificultades para separar ácido butírico del solvente, pares críticos de AG con polaridades similares, isómeros del ácido linoleico conjugado (CLA, AG de cadena larga poliinsaturados (LC-PUFAs. El objetivo fue mejorar el Método AOCS Ce 1j-07 aplicándolo a la composición en AG de mezcla de aceite soja/girasol, aceite de pescado, mantequilla, usando un programa de temperatura modificado, entre cinco laboratorios. El programa de temperatura elegido, si bien emplea más tiempo, permite separar completamente ácido butírico del solvente, trans-18:1 de cis-18:1, isómeros 20:1 de 18:3 n-3, 22:1 n-9 de 20:4 n-6

  19. Conjugated linoleic acid (CLA. Cis 9, trans 11 and trans 10, cis 12 isomer detection in crude and refined corn oils by capillary GC

    Directory of Open Access Journals (Sweden)

    Özlem Tokuşoğlu

    2008-06-01

    Full Text Available Conjugated linoleic acids (CLAs exhibit protective effects against various types of cancer and heart diseases. With the newly developed capillary gas chromatographic method (GC, cis9, trans11 and trans10, cis12 octadecadienoic acid isomers of CLA (C18:2 were determined in crude and refined corn oils as qualitative and quantitative measurements. Cis 9, trans11 C18:2 (c9, t11 CLA was the major CLA isomer in both oils. It was found that c9, t11 CLA was 0.62% of the total lipid in crude oil and 1.24% of the total lipid in refined oil. Using the refining process, the total CLA was 1.38% whereas that of crude corn oil was 0.62%. An approximate 2.2 fold increase in the total CLA was found in refined oil (n = 9 (p y = 2.782x + 0.046 (R2 = 0.9999] were performed (p El ácido linoleico conjugado (CLA parece exhibir efecto protector frente a enfermedades cardiovasculares y varios tipos de cáncer. En este trabajo, se establece un mátodo analítico mediante cromatografía de gases con columna capilar para la determinación cualitativa y cuantitativa de los isómeros cis 9,trans 11 y trans 10, cis 12 en aceites de maiz crudo y refinado. El isómero cis 9, trans11 C18:2 fue el mayoritario encontrándose en concentraciones de 0.62% en el aceite cru,do y de 1.24 % en el aceite refinado. La cantidad total de CLA encontrada en el aceite refinado (n = 9 (p 2 = 0.9999 y de recuperación [y = 2.782x+0.046 (R2 = 0.9999]. El método cromatográfico propuesto podría ser usado para el control de calidad de los aceites vegetales.

  20. Antioxidant potential of extracts from different agro wastes: Stabilization of corn oil

    Directory of Open Access Journals (Sweden)

    Ali Shahid Chatha, Shahzad

    2008-09-01

    Full Text Available The antioxidant potential of 80% methanolic extracts of some agro wastes (pomegranate peel, apple peel, banana peel, citrus peel, corncob, wheat husk, wheat bran, rice bran, and rice hull was assessed. The yields of the extracts varied over a wide range (8.83 to 29.9 g/100g of dry weight. TPC, TFC, total flavonols (kaempeferol, quercetin, myricetin; HPLC method, DPPH. radical scavenging and inhibition of linoleic acid peroxidation for the extracts varied significantly (P En este studio se determinó el potencial antioxidante de extractos de methanol al 80%, de distintos resíduos de granada, manzana, frutos cítricos, maíz, trigo y arroz. Los rendimientos de los extractos variaron en un amplio rango (8.89 a 29.9 g/100 g de materia seca. La cantidad total de compuestos fenólicos, de flavonoides y de flavonoles, así como la capacidad para secuestrar radicales y la inhibición de la oxidación del ácido linoleico varió significativamente (P < 0.05. El extracto de piel de granada contenía las cantidades más elevadas de compuestos fenólicos, de flavonoides y de flavonoles y exhibió la capacidad antioxidante más elevada, seguido del de piel de manzana, piel de cítricos, piel de plátano, mazorca de maíz, salvado de trigo, salvado de arroz, cáscara de trigo y cáscara de arroz. Igualmente, se estableció la actividad antioxidante de los extractos usando aceite de maíz como sustrato. Muestras de aceite estabilizadas con los distintos extractos (600 mg/kg fueron sometidas a oxidación acelerada (60 °C en horno durante 30 días con ciclos de calentamiento de 8 h/día y periódicamente se determinaron los siguientes índices: dienos y trienos conjugados, índice de panisidina e índice de peróxidos. Finalmente, se estudiaron las correlaciones entre los resultados de los distintos ensayos y los niveles de compuestos con acción antioxidante, destacando los extractos de pieles de fruta por su mayor contenido en compuestos fen

  1. NOVEL INSIGHTS ON INTAKE OF MEAT AND PREVENTION OF SARCOPENIA: ALL REASONS FOR AN ADEQUATE CONSUMPTION.

    Science.gov (United States)

    Rondanelli, Mariangela; Perna, Simone; Faliva, Milena Anna; Peroni, Gabriella; Infantino, Vittoria; Pozzi, Raffaella

    2015-11-01

    Introducción: la sarcopenia se define como un síndrome caracterizado por la pérdida progresiva y generalizada de la masa muscular y de la fuerza. La principal causa de la sarcopenia es la alteración del metabolismo de las proteínas, en la que los procesos proteolíticos no van acompañados de una síntesis de proteínas y células musculares adecuadas, con lo que se pierde progresivamente la sensibilidad al estímulo anabólico. El enfoque más racional para retrasar la progresión de la sarcopenia y contrarrestar la resistencia anabólica es una nutrición adecuada. La carne contiene compuestos biológicamente activos, tales como creatina, carnitina y ácido linoleico conjugado (CLA) que tienen impactos significativos sobre el metabolismo de la proteína humana. Métodos: se realizó una revisión de la literatura narrativa para evaluar la evidencia hasta ahora, en relación con: 1. ingesta adecuada de carne en ancianos como prevención de la sarcopenia; 2. la ingesta correcta de compuestos biológicamente activos que contiene la carne, que tienen impactos significativos sobre el metabolismo de la proteína humana y para así obtener efectos beneficiosos en la prevención de la sarcopenia. Esta revisión incluyó 62 estudios elegibles. Resultados: los resultados demostraron que en personas de edad avanzada la terapia óptima con dieta para la prevención y tratamiento de la sarcopenia, que debe apuntar al logro de los objetivos metabólicos específicos, debe recomendar el consumo de 113 g de carne (220 kcal; 30 g de proteínas) cinco veces a la semana. Conclusión: en una dieta variada y equilibrada, para prevenir la sarcopenia, se recomienda consumir la carne 4-5 veces a la semana (carne blanca 2 veces por semana, carne roja magra menos de 2 veces por semana, carne procesada menos de 1 vez por semana), como se sugiere en la pirámide de la dieta para personas mayores.

  2. Effect of conjugated linoleic acid mixtures and different edible oils in body composition and lipid regulation in mice.

    Science.gov (United States)

    Scalerandi, María Victoria; Gonzalez, Marcela Aida; Saín, Juliana; Fariña, Ana Clara; Bernal, Claudio Adrián

    2014-03-01

    Introducción: Las evidencias sugieren que las mezclas de Ácido Linoleico Conjugado (ALC) de origen comercial o natural diferencialmente afectan diferencialment al estado nutricional y al metabolismo lipídico. Objetivo: Investigar el efecto de dos preparaciones de ALC como complemento de grasas dietarias con diferentes proporciones de ácidos grasos (AG) n-9, n-6 y n-3 sobre composición corporal, niveles de triacilglicéridos (TG) y metabolismo lipídico en ratones. Métodos: Se alimentó a ratones en crecimiento con dietas con aceite de oliva, maíz y canola, o colza suplementadas con una mezcla equimolecular de ALC (mezcla-ALC) o aceites ricos en ácido ruménico (AR) por 30 días. Se evaluó: ganancia de peso, composición corporal, peso de tejidos, niveles de TG plasmáticos y séricos, y parámetros de regulación lipídica. Resultados: Independientemente de las grasas dietarias, la mezcla-ALC redujo el peso corporal y depósitos grasos relacionados con hepatomegalia, incremento de TG séricos y descenso de TG musculares. El aceite de canola previno la esteatosis hepática producida por la mezcla-ALC a aceites de oliva y maíz por incremento de la secreción de TG. AR decreció los depósitos grasos sin hepatomegalia, esteatosis hepática e hipertrigliceridemia. Aceite de oliva previno el incremento de TG musculares inducidos por suplementación con AR al aceite de maíz y canola. Discusión y conclusión: Las proporciones de AG insaturados dietarios modularon la respuesta de mezcla-ALC y AR al metabolismo lipídico en ratones. Finalmente, aceite de canola previno la esteatosis hepática inducida por mezcla-ALC, y los efectos benéficos más notorios fueron observados cuando aceite de oliva fue suplementado con AR, debido a la reducida acreción de lípidos sin cambios en los niveles de TG.

  3. ENRIQUECIMIENTO DE HUEVOS CON ÁCIDOS GRASOS OMEGA-3 MEDIANTE LA SUPLEMENTACIÓN CON SEMILLA DE LINO (Linum usitatissimum EN LA DIETA

    Directory of Open Access Journals (Sweden)

    Gonzalo Díaz

    2009-04-01

    Full Text Available Objetivo. Enriquecer los huevos de gallina con ácidos grasos omega-3 (n-3 mediante la inclusión de semillas de lino en la dieta. Materiales y métodos. La dieta de las aves fue formulada con niveles de 0 (L0, 10 (L10, 15 (L15 y 20% (L20 de linaza. Se determinó la composición de ácidos grasos por cromatografía de gases y se evaluó la producción y calidad del huevo. Resultados. El porcentaje de producción de huevo fue superior en los grupos L0 y L15 (p<0.05 con 93,0 y 91,5% de producción comparada con 86,0 % en los grupos L10 y L20. La mejor conversión de alimento se presentó también en los grupos L0 y L15. Con la inclusión de semilla de lino, se incrementó el contenido de ácidos grasos n-3 desde 3,0 % en el grupo L0 hasta 12,6 % en el grupo L20, siendo los ácidos grasos n-3 á-linolénico (C18:3, n-3 y docosahexahenóico (DHA, C22:6, n-3 los hallados en mayor concentración. Con la inclusión de linaza en la dieta de las gallinas ponedoras se redujo el contenido de acido linoleico (C18:2n-6, lo cual resultó en una disminución en la relación n-6: n-3. Conclusiones. Con base en la evaluación económica se concluye que es posible enriquecer la yema de huevo de gallina hasta con un 10,1 % de ácidos grasos n-3 mediante la inclusión de un 15 % de linaza en la dieta de las gallinas, sin embargo, esto representó un sobrecosto de producción del 12%.

  4. Qualidade da carne do músculo longissimus dorsi de novilhos superjovens Aberdeen Angus de biótipo pequeno e médio abatidos com o mesmo estágio de acabamento na carcaça = Meat quality of the longissimus dorsi muscle of Aberdeen Angus steers of small and medium frame score, slaughtered at the same carcass finishing stage

    Directory of Open Access Journals (Sweden)

    Miguelangelo Ziegler Arboitte

    2011-04-01

    Full Text Available O objetivo deste trabalho foi verificar a influencia do biotipo pequeno e medio de novilhos Aberdeen Angus superjovens na composicao da carne do longissimus dorsi (LD. Foram utilizadas seccoes do LD de oito novilhos com biotipo pequeno e dez com biotipo medio, confinados por 158 dias, apresentando ao abate idade e peso vivo medio de 456 dias e 429 kg. A alimentacao foi constituida de silagem de sorgo e concentrado na relacao 60:40 nos primeiros 63 dias e apos 50:50 ate o abate. O biotipo foi calculado por meio da formula: B = -11,548 +(0,4878 x h - (0,0289 x ID + (0,0000146 x (ID2 + (0,0000759 x h x ID; h = altura em polegadas e ID=idade em dias. A carne do LD apresentou gordura intramuscular media (10,11 pontos; p = 0,7034, coloracao vermelha (4,33 pontos; p = 0,3724, textura com tendenciaa muito fina (4,61 pontos; p = 0,3075 e forca ao cisalhamento de 2,72 kgf cm-2 (p = 0,4009. A carne apresentou 72,27% (p = 0,4355 de umidade, 19,34% (p = 0,4150 de proteina bruta, 3,96% (p = 0,9071 de lipidios, 4,43% (p = 0,9842 de minerais e 0,25 mg 100g-1 de carne(p = 0,2375 de colesterol. Os biotipos nao influenciaram na concentracao dos acidos graxos palmitico (p = 0,0790, estearico (p = 0,2455, oleico (p = 0,3046, linoleico (p = 0,9456, ocorrendo alteracao na participacao do acido graxo miristico (. = 1,85 + 0,12B; p = 0,043. O estudo do biotipo na composicao da carne e importante para a identificacao de melhores caracteristicas nutraceuticas.The objective of this work was to assess the influence of small and medium frame scores in the meat composition of the longissimus dorsi (LD muscle of Abredeen Angus steers. We used LD sections from eight small-framed steers and ten medium-framed steers, confined for 158 days, with mean slaughter age of 457 days and 429 kg live weight. The feed was composed of sorghum silage and concentrate in a 60:40 ratio for the first 63 days, and 50:50 thereafter until slaughter. Frame wascalculated using the formula: F=-11

  5. Double blind randomized clinical trial controlled by placebo with an alpha linoleic acid and prebiotic enriched cookie on risk cardiovascular factor in obese patients Ensayo clínico aletorizado doble ciego controlado con placebo con una galleta enriquecida en ácido alfa linoleico y prebióticos en el patrón de riesgo cardiovascular de pacientes obesos

    OpenAIRE

    D. A. De Luis; B. de la  Fuente; O. Izaola; Conde, R.; Gutiérrez, S.; M.ª Morillo; C. Teba Torres

    2011-01-01

    Introduction: Inulin and FOS are prebiotics with potential benefit in cardiovascular risk factors. Alpha linolenic acid (ALA) is the metabolic precursor of the long chain n-3 fatty acid eicosapentaenoic acid (20: 5n-3), this fatty acid has anti-inflammatory properties. The aim of our study was to evaluate the response of the cardiovascular risk profile in obese patients after inclusion in the diet of an ALA, FOS and inulin enriched-cookie. Material and methods: 36 patients were randomized in ...

  6. Impregnation of 12-tungstophosphoric acid on silica - part II: effect of different solvents on the impregnation and catalytic activity in methyl esterification of stearic acid; Impregnacao do acido 12-tungstofosforico em silica - parte II: efeito de diferentes solventes na impregnacao e atividade catalitica na esterificacao metilica de acido estearico

    Energy Technology Data Exchange (ETDEWEB)

    Scroccaro, Karine Isabel; Yamamoto, Carlos I., E-mail: karineisabel@yahoo.com.br [Universidade Federal do Parana (UFPR), Curitiba, PR (Brazil). Centro Politecnico. Departamento de Engenharia Quimica; Tanobe, Valcineide O. de A.; Oliveira, Alan Antonio de [Universidade Federal do Parana (UFPR), Curitiba, PR (Brazil). Departamento de Engenharia e Tecnologia Florestal; Wypych, Fernando [Universidade Federal do Parana (UFPR), Curitiba, PR (Brazil). Departamento de Quimica

    2014-04-15

    Materials obtained by the immobilization of 12-tungstophosphoric acid (PTA) on silica using the method of impregnation with excess solution in distinct solvents (aqueous HCl, methanol:H{sub 2}O, and acetonitrile) were evaluated for use as catalysts in the methyl esterification of stearic acid. Optimum conditions were established for the impregnation of 0.5 g (w/w) of PTA on amorphous silica, under stirring at 150 rpm for 24 h, using 20 mL of 0.1 mol L{sup -1} HCl as the solvent. After calcination at 200 deg C, high conversions were obtained under mild reaction conditions, resulting in high turnover numbers. The catalyst was evaluated in ten catalytic cycles of use, where the activity was reduced only slightly, attesting its stability and the possibility to apply it to industrial production of methylesters. (author)

  7. Optimized Analytical Method to Determine Gallic and Picric Acids in Pyrotechnic Samples by Using HPLC/UV (Reverse Phase); Optimizacion del Metodo Analitico mediante HPLC/UV Operando en Fase Inversa para la Determinacion de Acido Galico y Acido Picrico en Muestras de Origen Pirotecnico

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Alonso, S.; Perez Pastor, R. M.

    2013-10-01

    A study on the optimization and development of a chromatographic method for the determination of gallic and picric acids in pyrotechnic samples is presented. In order to achieve this, both analytical conditions by HPLC with diode detection and extraction step of a selected sample were studied. (Author)

  8. Development of methodology for the synthesis of poly(lactic acid-co-glycolic acid) for use in the production of radioactive sources; Desenvolvimento da metodologia para sintese do poli(acido latico-co-acido glicolico) para utilizacao na producao de fontes radioativas

    Energy Technology Data Exchange (ETDEWEB)

    Peleias Junior, Fernando dos Santos; Zeituni, Carlos Alberto; Rostelato, Maria Elisa Chuery Martins; Souza, Carla Daruich de; Mattos, Fabio Rodrigues de; Moura, Eduardo Santana de; Moura, Joao Augusto; Benega, Marcos Antonio Gimenes; Feher, Anselmo; Costa, Osvaldo Luiz da; Rodrigues, Bruna Teiga, E-mail: fernandopeleias@gmail.com [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP/CTR), Sao Paulo, SP (Brazil). Centro de Tecnologia das Radiacoes; Fechine, Guilhermino Jose [Universidade Presbiteriana Mackenzie, Sao Paulo, SP (Brazil). Escola de Engenharia

    2015-05-15

    According to the World Health Organization, cancer is a leading cause of death worldwide. A radiotherapy method extensively used in prostate cancer is brachytherapy, where the area requiring treatment receives radioactive seeds. Iodine-125 seeds can be inserted loose or stranded in bioabsorbable polymers produced from poly(lactic-co-glycolic acid) (PLGA). We developed the synthesis methodology for PLGA and the results obtained show that it was possible to determine the optimal reaction parameters (time and temperature) for PLGA in 80/20 (lactide/glycolide) ratio. The yield was higher than 90% using a temperature of 110 °C and reaction time of 72 hours; however, the molecular weight values obtained are very low compared to those obtained by other authors. New tests using previously synthesized dimers and nitrogen atmosphere are being performed. These conditions could potentially increase the molar mass of PLGA. All techniques used confirmed the expected structure of the polymer. (author)

  9. Marginal microleakage in vitro study on class V cavities prepared with Er:YAG laser and etched with acid or etched with Er:YAG laser and acid; Estudo in vitro da microinfiltracao marginal em cavidades classe V preparadas com laser de Er:YAG e condicionadas com acido ou com laser de Er:YAG e acido

    Energy Technology Data Exchange (ETDEWEB)

    Tavares, Henrique Dutra Simoes

    2001-07-01

    Microleakage at the interface between the teeth and the restorative materials remains a problem with composite resin restorations. Microleakage at the gingival margins of class V cavities restorations still challenge as they are usually placed in dentin and/or cementum. Previous studies have shown that the cavity preparation with Er:YAG laser is possible. It has been reported that Er:YAG laser has ability to create irregular surface providing micromechanical retention for adhesive dental restorative materials and to improve marginal sealing. The purpose of this in vitro study was to evaluate the marginal microleakage on class V cavities prepared with Er:YAG laser and etched with acid or with Er:YAG laser and acid, in compared to those prepared and etched conventionally. Thirty human molars were divided into three groups, namely: group I - prepared with Er:YAG laser (KaVo KEY Laser II - Germany) and etched with 37% phosphoric acid; group II - prepared with Er:YAG laser and etched with Er:YAG laser and 37% phosphoric acid; group III (control group) - prepared with high speed drill and etched with 37% phosphoric acid. All cavities were treated with same adhesive system (Single Bond - 3M) and restored with the composite resin (Z100 - 3M), according to the manufacturer's instructions. The specimens were stored at 37 deg C in water for 24 hours, polished with Sof-Lex discs (3M), thermally stressed, sealed with a nail polish coating except for the area of the restoration and 1 mm around it, and immersed in a 50% aqueous solution of silver nitrate for 24 hours. After that, the specimens were rinsed in water, soaked in a photodeveloping solution and exposed to a fluorescent light for 8 hours. The teeth were embedded in an autopolymerizing resin and sectioned longitudinally using a diamond saw microtome under running water. The sections were photographed. The microleakage at the occlusal cavity and at the gingival margins of each specimen was evaluated with scores (0-3) by three calibrated examinators. Both results on occlusal and gingival margins have shown no statistic significant difference among the three groups evaluated (p>0.05). The Er:YAG laser have shown to be as effective as the conventional methods for cavity preparation and etching, suggesting its use for the class V cavity preparation and enamel etching. (author)

  10. Composicao quimica, perfil de acidos graxos e quantificacao dos acidos ƒ¿-linolenico, eicosapentaenoico e docosahexaenoico em visceras de tilapias (Oreochromis niloticus = Percentual composition, fatty acids and quantification of the LNA (Alfa-Linolenic, EPA (Eicosapentaenoic and DHA (Docosahexaenoic acids in visceras of Nile Tilapia (Oreochromis niloticus

    Directory of Open Access Journals (Sweden)

    Nilson Evelázio de Souza

    2005-01-01

    Full Text Available Foi avaliada a composição química de vísceras de tilápias (Oreochromis niloticus criadas em cativeiro Os teores de umidade, cinza, proteína bruta e lipídios totais foram de 64,4%; 1,3%; 6,3% e 18,0%, respectivamente, caracterizando alta concentração de lipídiostotais em relação a outros resíduos de peixes. Foram identificados 49 ácidos graxos, sendo majoritários os ácidos: oléico, (32,8%, seguido do palmítico, (19,9% e linoléico, (18,2%. As razões entre n-6/n-3 e ácidos poliinsaturados/saturados foram de 5,5 e 0,9, respectivamente. As quantificações dos ácidos graxos alfa-linolênico, eicosapentaenóico e docosahexaenóico, em mg/g de lipídios totais, foram de 10,4, 1,4 e 9,3, respectivamente. O elevado teor de lipídios totais das vísceras contribuiu significativamente para as quantidadesde ácidos graxos n-3. Todos os parâmetros analisados foram satisfatórios sob o ponto de vista nutricional e neste sentido as vísceras de tilápias poderão ser utilizadaa para alimentar peixes ou outros animais.The chemical composition was evaluated in visceras of tilapias raised in captivity. The moisture, ash, crude protein and total lipids contents were 64.4%; 1.3%; 6.3% and 18.0%, respectively, characterizing high total lipids concentration in relation other residues of fish. Forty nine fatty acids were detected, the major fatty acids were oleic (32.8%, palmitic (19.9% and linoleic-1 (18.2% and oleic (9.4%. The ratio n-6/n-3 and polyunsaturated/saturated fatty acids, showed the values 5.5 and 0.9, respectively. The quantifications of alfa-linolenic, eicosapentaenoic and docosahexaenoic acids (in mg/g of total lipids, were 10.4, 1.4 and 0.3, respectively. The higher contents of total lipids in visceras contributed significantly for amounts of n-3 fatty acids. All the parameters analyzed were shown nutritional value satisfactory in this sense visceras of tilapias can be used in the feed of fish and other animal.

  11. Development of methodology for the synthesis of poly(lactic acid-co-glycolic acid) for use in the production of radioactive sources; Desenvolvimento da metodologia para sintese do poli(acido latico-co-acido glicolico) para utilizacao na producao de fontes radioativas

    Energy Technology Data Exchange (ETDEWEB)

    Peleias Junior, Fernando dos Santos

    2013-07-01

    According to World Health Organization (WHO), cancer is a leading cause of death worldwide. Prostate cancer is the second most common cancer in men. A method of radiotherapy which has been extensively used is brachytherapy, where radioactive seeds are placed inside the area requiring treatment. Iodine-125 seeds can be placed loose or stranded in bioabsorbable polymers. Stranded seeds show some advantages, since they reduce the rate of seed migration, an event that could affect the dosimetry of the prostate and cause unnecessary damage to healthy tissues or organs. For Iodine-125 stranded seeds, polyglactin 910 (poly(lactic-co-glycolic acid)) (PLGA), with a coverage of polyglactin 370 (Vicryl Registered-Sign ) is used. It was purposed in this dissertation, the study and development of the synthesis methodology for PLGA via ring-opening polymerization, as well as its characterization, with the objective of using the synthesized material to manufacture a material similar to RAPID Strand{sub Registered-Sign }. The results obtained show that it was possible to determine the optimal reaction parameters (time and temperature) for PLGA in 80/20 (lactide/glycolide) ratio. Using a temperature of 110 Degree-Sign C and reaction time of 24h, a yield of 86% was obtained, and increasing the reaction time to 72 hours, the yield was higher than 90%. The molecular mass values obtained from the samples are still very low compared to those obtained by other authors in the literature (about 20%). Failures in the sealing of vials, leaving them vulnerable to moisture and oxygen, or lack of an efficient stirring system might be possible explanations for these results. A suitable chemical reactor could solve the problem. Regarding polymer characterization, all techniques used not only confirmed the expected structure of the polymer, but also showed the highest proportion of lactide units compared to to glycolide units. (author)

  12. Liquid-liquid extraction (LLE) of Fe(III) and Ti(IV) by bis-(2-ethyl-hexyl) phosphoric acid (D2EHPA) in sulfuric acid medium; Extracao liquido-liquido de ferro (III) e titanio (IV) pelo acido bis-(2-etil-hexil) fosforico (D2EHPA) em meio de acido sulfurico

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Glauco Correa da; Cunha, Jose Waldemar Silva Dias da [Instituto de Engenharia Nuclear (IEN), Rio de Janeiro, RJ (Brazil). Dept. de Quimica e Materiais Nucleares; Dweck, Jo [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Escola de Quimica. Dept. de Processos Inorganicos; Afonso, Julio Carlos [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Inst. de Quimica. Dept. de Quimica Analitica]. E-mail: julio@iq.ufrj.br

    2008-07-01

    This work presents a study on the separation of Fe(III) and Ti(IV) from sulfuric acid leaching solutions of ilmenite (FeTiO{sub 3}) using liquid-liquid extraction with D2EHPA in n-dodecane as extracting agent. The distribution coefficients (K{sub D}) of the elements related to free acidity and concentration of Fe(III) and Ti(IV) were determined. Free acidity was changed from 3x10{sup -2} to 11.88 mol L{sup -1} and D2EHPA concentration was fixed at 1.5 mol L{sup 1}. Recovery of final products as well as recycling of wastes generated in the process were also investigated. The LLE process as a feasible alternative to obtain high-purity TiO{sub 2}. (author)

  13. Esterificacion quimioselectiva de fitosteroles de madera mediante lipasas

    National Research Council Canada - National Science Library

    Illanes, Andres; Alvarez, Lorena; Alvaro, Gregorio

    2008-01-01

    .... Ambas sustancias son muy similares, lo que impide su separacion por metodos fisicos, siendo la esterificacion selectiva de esta mezcla con esteres de acidos grasos mediante lipasas quimioselectivas...

  14. NCBI nr-aa BLAST: CBRC-PHAM-01-1048 [SEVENS

    Lifescience Database Archive (English)

    Full Text Available CBRC-PHAM-01-1048 ref|YP_003183601.1| hypothetical protein Aaci_0148 [Alicyclobacillus acido...caldarius subsp. acidocaldarius DSM 446] gb|ACV57212.1| hypothetical protein Aaci_0148 [Alicyclobacillus acido...caldarius subsp. acidocaldarius DSM 446] YP_003183601.1 6e-05 22% ...

  15. NCBI nr-aa BLAST: CBRC-PHAM-01-1744 [SEVENS

    Lifescience Database Archive (English)

    Full Text Available CBRC-PHAM-01-1744 ref|YP_003183601.1| hypothetical protein Aaci_0148 [Alicyclobacillus acido...caldarius subsp. acidocaldarius DSM 446] gb|ACV57212.1| hypothetical protein Aaci_0148 [Alicyclobacillus acido...caldarius subsp. acidocaldarius DSM 446] YP_003183601.1 4e-17 40% ...

  16. Study of stability of humic acids from soil and peat irradiated by gamma rays; Estudo da estabilidade de acidos humicos extraidos de solo e turfa, frente a radiacao ionizante gama

    Energy Technology Data Exchange (ETDEWEB)

    Silva, Wilson Tadeu Lopes da

    1995-07-01

    Humic acids samples (one deriving from a sedimentary soil and other from a peat), in aqueous media, were irradiated with gamma rays, in doses of 10, 50 and 100 kGy, in order to understand their chemical behavior after the irradiation. The material, before and after irradiation, was analyzed by Elemental Analysis, Functional Groups (carboxylic acids and phenols), UV/Vis Spectroscopy (E{sub 4}/E{sub 6} ratio), IR spectroscopy, CO{sub 2} content and Gel permeation Chromatography (GPC) ). The Elemental Analysis showed the humic acid derived from a peat had a most percentage quantity of Carbon and Hydrogen than the material from a sedimentary soil. From the UV/Vis Spectroscopy, it was observed a decrease of E{sub 4}/E{sub 6} ratio with an increase of the applied dose. The data from GPC are in agreement with this. The results showed that the molecular weight of the material increased by exposing it to a larger radiolitical dose. The peat material was less affected by the gamma radiation than the soil material. The carboxylic groups were responsible by radiochemical behavior of the material. (author)

  17. Estudio de las propensiones conformacionales del amino acido l-glutamato en regiones altamente estructuradas de proteínas resueltas por cristalografía de rayos x

    OpenAIRE

    Hincapié Parra, Dalia Andrea

    2011-01-01

    Aunque el estudio de la conformación en biomoléculas es fundamental para el entendimiento de sus funciones biológicas, la información concerniente a estudios estructurales y conformacionales de las estructuras de macromoléculas a partir de los datos reportados experimentalmente resonancia magnética nuclear (RMN) y cristalografía de rayos X (DRX) y de los estados estructurales preferenciales particularmente para proteínas y los residuos de aminoácidos que las constituyen son limitados y en muc...

  18. Niobium (V) doped bioceramics: evaluation of the hydrothermal route modified with citric acid and urea to obtain modified hydroxyapatite; Bioceramicas aditivadas com niobio (V): avaliacao da rota hidrotermica modificada com acido citrico e ureia para obtencao de hidroxiapatitas modificadas

    Energy Technology Data Exchange (ETDEWEB)

    Simomukay, E.; Souza, E.C.F. de; Antunes, S.R.M.; Borges, C.P.F.; Michel, M.D.; Antunes, A.C. [Universidade Estadual de Ponta Grossa (UEPG), Ponta Grossa, PR (Brazil)

    2016-01-15

    Synthetic hydroxyapatite (Ca{sub 10}(PO{sub 4}){sub 6}(OH){sub 2}; HA) has become a widely used ceramic material for bone reconstruction due to its biocompatibility with the bone tissue. This biocompatibility as well as other physical and chemical properties of the hydroxyapatite can be modified by the addition of different ions to its structure. Niobium (V) ion has not been commonly used in the hydroxyapatite synthesis. The objective of this study was to evaluate the use of hydrothermal route in the niobium (V) doped hydroxyapatite synthesis. The route used the niobium ammonium oxalate (NH{sub 4}H{sub 2}[NbO(C{sub 2}O{sub 4}){sub 3}].3H{sub 2}O) complex as a niobium (V) ion precursor. The addition of citric acid and urea in the hydrothermal route is used for the control of synthesis pH and precipitation rate. Pure sample and sample added with 5.3 ppm of niobium (V) ion were prepared. The coexistence of other phases besides the hydroxyapatite was not observed in any of the samples through the use of X-ray diffraction and infrared spectroscopy (FTIR) techniques. The FTIR technique revealed the presence of hydroxyapatite characteristic functional groups. The scanning electron microscopy analysis showed the formation of agglomerates composed of round particles, confirmed by the transmission electron microscopy technique. The X-ray fluorescence spectroscopic analysis detected the presence of niobium in the doped sample. The results showed that niobium (V) doped hydroxyapatite can be synthesized by means of hydrothermal route, which may be considered as huge potential for future application in bioceramics. (author)

  19. Preparation and characterization of polymer blends based on recycled PET and polyester derived by terephthalic acid; Preparacao e caracterizacao de blendas polimericas a base de PET reciclado e poliester derivado do acido tereftalico

    Energy Technology Data Exchange (ETDEWEB)

    Ohara, L.; Miranda, C.S.; Fiuza, R.P.; Luporini, S.; Carvalho, R.F.; Jose, N.M., E-mail: leandro.ohara@gmail.co [Universidade Federal da Bahia (GECIM/UFBA), Salvador, BA (Brazil). Inst. de Quimica. Grupo de Energia e Ciencias dos Materiais

    2010-07-01

    Environmentally friendly materials, made from industrial waste, are being increasingly used as a solution to the growing amount of waste generated by society, but also as a cheaper alternative to replace conventional materials for use in construction. In this work were investigated the properties of polymer blends based on recycled PET and a polyester derived from terephthalic acid and glycerin, a co-product of biodiesel. The samples were characterized by XRD, TGA, DSC, FTIR and SEM. The polyester synthesized showed a degradation event near 300 deg C. The blends with higher ratio of PET showed thermal behavior similar to pure PET. The X-ray diffraction showed that the polymer blends are semicrystalline materials. The micrographs presents the presence of a smooth surface, indicating the possibility of miscibility between the arrays. Therefore, the blending makes possible the fabrication of low-cost materials with applications in several areas. (author)

  20. Se trata de determinar la eficacia y seguridad del acido tranexamico frente a placebo en la reduccion de las perdidas sanguineas asociadas a la cirugia de reemplazo total de cadera | EU Clinical Trials Register [EU Clinical Trials Register

    Lifescience Database Archive (English)

    Full Text Available reduccion de las perdidas sanguineas asociadas a la cirugia de reemplazo total de cadera MedDRA Classificat...de edad que se les vaya a realizar cirugia de reemplazo total de cadera (CRT)---ASA I-III-Sin alergias al ác

  1. Estabilidad oxidativa y calidad sensorial de carne de pollo enriquecida con acidos grasos n-3 proveniente de fuentes de origen vegetal y animal, protegida con vitamina E y selenio orgánico.

    OpenAIRE

    GALLINGER, CLAUDIA ISABEL

    2015-01-01

    [EN] Despite people attitudes concerning healthy eating, western diets still show a low intake of n-3 polyunsaturated fatty acid (PUFA). Among Argentinean people the consumption of fish meat is relatively poor, being beef and chicken meat their main sources of protein. A viable way of increasing the consumption of n-3 PUFA is to raise the intake of products enriched with them. Chicken meat is rated in second place in the consumption of meat in Argentina. This meat, like others, is a nutrit...

  2. Synthesis and characterization of chitosan-graft-poly(acrylic acid)/rice husk ash hydrogels composites; Sintese e caracterizacao de hidrogeis compositos de cinza da casca de arroz e quitosana enxertada com poli(acido acrilico)

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigues, Francisco H.A. [Universidade Estadual Vale do Acarau - UVA, Sobral, CE (Brazil); Lopes, Gabriel V.; Pereira, Antonio G.B.; Fajardo, Andre R.; Muniz, Edvani C. [Universidade Estadual de Maringa - UEM, PR (Brazil)

    2011-07-01

    According to environmental concerns, super absorbent hydrogel composites were synthesized based on rice husk ash (RHA), an industrial waste, and Chitosan-graft-poly(acrylic acid). The WAXS and FTIR data confirmed the syntheses of hydrogel composites. The effect of crystalline or amorphous RHA on water uptake was investigated. It was found that the RHA in crystalline form induces higher water capacity (W{sub eq}) of composites hydrogels due to the fact that the intra-interactions among silanol groups on RHA make available new sites in the polymer matrix, which could interact to water. (author)

  3. Modified montmorillonite as a heterogeneous catalyst in (m)ethyl esterification reaction of lauric acid; Montmorilonita modificada como catalisador heterogeneo em reacoes de esterificacao (M)etilica de acido laurico

    Energy Technology Data Exchange (ETDEWEB)

    Zatta, Leandro; Nepel, Angelita; Barison, Andersson; Wypych, Fernando, E-mail: wypych@ufpr.br [Departamento de Quimica, Universidade Federal do Parana (UFPR), Curitiba , PR (Brazil)

    2012-07-01

    Montmorillonite was modified with zirconium polyoxycations in the presence of ammonium sulphate. The material was characterized and used as a catalyst in the esterification of lauric acid, the reactions being accompanied by 2{sup 3} factorial design. Conversions of up to 95.33 and 83.35% were observed for the methyl and ethyl esterification reactions respectively, proving superior to results obtained by thermal conversion. The material was submitted to three reaction cycles and similar conversions were observed, indicating the catalyst is not significantly deactivated after reuse. The catalyst was also tested under reflux conditions, yielding a maximum conversion of 36.86%. (author)

  4. Cleaning of the diffusers with formic acid for aeration of an active sludge process; Limpieza con acido formico de los difusores demembrana para la aireacion en un proceso de fangos activos

    Energy Technology Data Exchange (ETDEWEB)

    Simon Andre, P.; Lardin Mifsut, C.; Abella Solar, M.; Marc Ponsoda, J.; Garcia del Real, A.; Perez Sanchez, P.

    2009-07-01

    Electric energy costs are one of the main issues inside the total amounts in a WWTP, being the aeration system consumption the highest one but also the most flexible and order to reduce the global costs. In this work it has been quantified the improvement obtained when formic acid is used to do periodic cleanness of the diffusers. When this is used, manual cleanness can be kept apart. During the cleanness processes with formic acid, it has been observed a reduction in the pressure drop, between 6 and 13%, and a reduction in the power demand, between 7 and 12% . These reduction have been correlated with the annual costs, reaching an annual saving of near 3%. (Author) 8 refs.

  5. Evaluation of oil ducts wettability by measurements of contact angle. Effect of asphaltenes and naphtenic acids; Avaliacao da molhabilidade de oleodutos atraves de medidas de angulo de contato. Efeitos de asfaltenos e acidos naftenicos do petroleo

    Energy Technology Data Exchange (ETDEWEB)

    Santos, Ronaldo G. dos; Mokamed, Rahoma S. [Universidade Estadual de Campinas, SP (Brazil). Faculdade de Engenharia Quimica; Loh, Watson [Universidade Estadual de Campinas, SP (Brazil). Inst. de Quimica

    2003-07-01

    The recent interest of the petroleum companies for heavy crude oils reserves have been increased in the last decades. Rheological properties of these oils interferes with their economical production and transportation. Technologies based on the flow of lubricated oil through an aqueous film (Core Flows) represent an alternative way to improve of the flow efficiency and viability of the recovery of these heavy oils. In the systems, the pressure drop caused from the high values of viscosity can be reduced to values similar to those encounter in single aqueous flow. The progressive accumulation oil on the pipeline walls is, however, the major problem for the implementation of core flow. For oil accumulation to take place, pipeline surface would need to be oil-wet. This work examines the wettability of pipeline surfaces and the effect of oil phase polar constitute such as asphaltenes and naphtenic acids in the possible alteration of these surfaces from water-wet to oil-wet. The effect of crude oil fractions on the wettability is shown by measurements of contact angle. Commercial and carbon steel are tested. The results show that the wettability of the surfaces depend on oil composition and can be rectified by components in aqueous phase. (author)

  6. Influence of the temperature in the uranyl sorption in zirconium diphosphate modified with salicylic acid; Influencia de la temperatura en la sorcion de uranilo en difosfato de circonio modificado con acido salicilico

    Energy Technology Data Exchange (ETDEWEB)

    Garcia G, N.; Solis C, D. A. [Universidad Autonoma del Estado de Mexico, Facultad de Quimica, Paseo Colon y Paseo Tollocan s/n, 50000 Toluca, Estado de Mexico (Mexico); Ordonez R, E., E-mail: nidgg@yahoo.com.mx [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (MX)

    2011-11-15

    In this work the experimental conditions were established to evaluate the uranium (Vi) sorption to 20 and 40 C on the surface of the zirconium diphosphate (ZrP{sub 2}O{sub 7}) modified with a solution of salicylic acid 0.1 M. The modification of the ZrP{sub 2}O{sub 7} was produced during the hydrate process, taking advantage that these are formed complexes between the carboxyl and hydroxyl groups of salicylic acid and amphoteric species of the interface solid/liquid. The method is used by lots to elaborate the isotherms that explain the behavior of this sorption in different ph conditions and temperature, the quantity of the uranium reaction is analyzed with the fluorescence technique. The results indicated that in the temperature increases the uranium sorption on the material and is more efficient to low ph values. (Author)

  7. LF-NMR study of effect the octadecylamine addition in the copolymerization process between acrylic acid and styrene monomers; Estudo por RMN de baixo campo do efeito da adicao de octadecilamina na copolimerizacao dos monomeros de acido acrilico e estireno

    Energy Technology Data Exchange (ETDEWEB)

    Pedroza, Oscar J.O.; Tavares, Maria I.B. [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Inst. de Macromoleculas Professora Eloisa Mano]. E-mail: oscarjop@ima.ufrj.br, mibt@ima.ufrj.br

    2005-07-01

    The copolymer content at least two monomer units that are the repetitive unities in the polymeric chains. The use of Low Field Nuclear Magnetic Resonance (LF-NMR), MARAN ultra 23, was applied to measure the proton spin-lattice relaxation time values. The process of copolymerization between the acrylic acid (A) and the styrene (S) monomers was studied with the addition of the octadecylamine (D) in the acrylic acid monomer. These materials were submitted at reflux by 24 hours. After this process the polymerization was carried out at room temperature. The values of the relaxation parameter are showed in Table 1. The co polymerizations between acrylic acid and styrene monomers were influenced by the octadecylamine addition. The results showed that an increase in the amine concentration promotes flexibility in the final material. This can be explained in terms of chains size after amine addition, which promotes an increasing in the free space among the polymer chains. (author)

  8. Obtention of Samarium and Gadolinium concentrates by solvent extraction using mono-2-ethylhexyl ester of 2-ethylhexyl phosphonic acid; Obtencao de concentrados de samario e gadolinio via extracao por solventes com o ester mono-2-etilhexil do acido 2-etilhexilfosfonico

    Energy Technology Data Exchange (ETDEWEB)

    Miranda Junior, Pedro

    1996-07-01

    The rare earth chlorides solution employed in this study, which is constituted by medium and heavy fractions, is derived from monazite processing accomplished by NUCLEMON-Mineroquimica (SP). This solution shows an acidity about 1.18 M and 189 g/L of rare earth oxides, containing as main constituents: Sm(34.55%), Gd(23.85%), Dy (6.82%), and Y (24.45%). It was used, as organic phase, 2-ethylhexyl phosphonic acid, mono-2-ethylhexylester diluted to 1 M in isododecane. (author)

  9. The elution of erbium from a cation exchanger bed by means of the N-hydroxyethyl-ethylene-diamine triacetic acid; Mecanismo de la elucion del erbio en un cambiador cationico con el acido n-hidroxietil-etilen-diamono-triacetico

    Energy Technology Data Exchange (ETDEWEB)

    Amer Amezaga, S.

    1963-07-01

    A physicochemical study of the phenomena resulting when erbium is eluted from a cation-exchanger bed at a steady by means of the N-hydroxyethyl-ethylene-diamine-triacetic acid (HEDTA) is made. Two different retaining beds are used, a hydrogen bed, in which no ammonium passes through, and a zinc bed, which leaks ammonium ion. Good agreement between experimental and calculated values by using the equations deduced for the concentrations of the main species has been achieved, with errors around 1-2% in most of the experiments. (Author) 69 refs.

  10. Crystal structure of ATVORF273, a new fold for a thermo- and acido-stable protein from the Acidianus two-tailed virus

    DEFF Research Database (Denmark)

    Felisberto-Rodrigues, Catarina; Blangy, Stéphanie; Goulet, Adeline;

    2012-01-01

    in the viral world. To understand this intriguing phenomenon, we have undertaken structural studies of ATV virion proteins and here we present the crystal structure of one of these proteins, ATV[Formula: see text]. ATV[Formula: see text] forms tetramers in solution and a molecular envelope is provided...... for the tetramer, computed from small-angle X-ray scattering (SAXS) data. The crystal structure has properties typical of hyperthermostable proteins, including a relatively high number of salt bridges. However, the protein also exhibits flexible loops and surface pockets. Remarkably, ATV[Formula: see text......] displays a new [Formula: see text] protein fold, consistent with the absence of homologues of this protein in public sequence databases....

  11. Cyclopentenyl acids from sapucainha (Carpotroche brasiliensis Endl, Flacourtiaceae): the first antileprotic used in Brazil; Acidos ciclopentenicos do oleo da sapucainha (Carpotroche brasiliensis Endl, Flacourtiaceae): o primeiro antileprotico usado no Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Adriana S.; Lima, Joselia A.; Rezende, Claudia M.; Pinto, Angelo C. [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Centro de Tecnologia. Inst. de Quimica]. E-mail: crezende@iq.ufrj.br

    2009-07-01

    The chaoolmugra oil is one of the oldest medicines used for leprosy until the development of sulfas. In Brazil, it is known as sapucainha oil that is obtained from Carpotroche brasilienesis seeds (Flacourtiaceae). Chemical and medicinal studies of sapucainha oil were introduced in Brazil by Peckolt, Cole and Cardoso which showed that major ciclopentenyl fatty acids as chaulmoogric, hydnocarpic and gorlic were responsible for its bactericidal activity. In this work, a method for quantification of sapucainha oil acidic fraction by HRGC was established using methyl n-heptadecanoate as internal standard. The oil chemical stability was investigated by the use of GC-MS, IR, {sup 1}H and {sup 13}C NMR and showed that the main degradation products belong to the cyclopentenyl moiety oxidation. (author)

  12. Dosimetric influence of hyaluronic acid in patients with prostate cancer treated with RT3D; Influencia dosimetrica del acido hialuronico en pacientes cancer de prostata tratados con RT3D externa+HDR braquiterapia

    Energy Technology Data Exchange (ETDEWEB)

    Sanchez, J.; Vazquez, J. A.; Garcia Blanco, A. S.; Gomez, F.; Montejo, A.; Raba, J. I.; Pacheco, M. T.; Cardenal Carro, J.; Mendigueren, M. A.

    2013-07-01

    This study aims to assess the influence on dosimetry by the introduction of hyaluronic acid and assess the need for the realization of a second CT scan and consequent re-planning of RT3D treatment. (Author)

  13. Gamma radiation effects at color, antioxidant capacity and fatty acid profile in peanut (Arachis hypogaea L.); Efeitos da radiacao gama na cor, capacidade antioxidante e perfil de acidos graxos em amendoim (Arachis hypogaea L.)

    Energy Technology Data Exchange (ETDEWEB)

    Camargo, Adriano Costa de; Canniatti-Brazaca, Solange Guidolin; Mansi, Debora Niero; Domingues, Maria Antonia Calori [Escola Superior de Agricultura Luiz de Queiroz (ESALQ/USP), Piracicaba, SP (Brazil). Dept. de Agroindustria, Alimentos e Nutricao; Arthur, Valter, E-mail: arthur@cena.usp.b [Centro de Energia Nuclear na Agricultura (CENA/USP), Piracicaba, SP (Brazil)

    2011-01-15

    Irradiation is efficient at extinction fungi contamination in peanuts. Peanuts have high biologic value protein, minerals, vitamin E, complex B, and high concentration of lipids. The objective of this research is to evaluate the gamma irradiation effect on color, total phenolic, antioxidant activity, and fatty acid profile in peanuts (Arachis hypogaea L.). Cultivars IAC-Tatu ST and IAC-Runner 886 were submitted to gamma radiation with doses of 5.0; 7.5; 10.0, and 15.0 kGy and storage at room temperature. There was no significant difference in the color of IAC-Tatu ST. However, significant difference was found in the luminosity and Chroma in IAC-Runner 886. Total fenolics differed from the control with 33.27 mg.g{sup -1} and treatment dose of 10.0 kGy with 58.60 mg.g{sup -1} in IAC-Tatu ST. This parameter not had significant difference in IAC-Runner 886 and the control with 51.59 mg.g{sup -1}. The antioxidant activity did not present significant difference with a dose of 10.0 kGy, recommended for the elimination of fungi in peanuts. The dose of 10.0 kGy showed a decrease in saturated fatty acids, increase in unsaturated fatty acids, and an increase in linolleic acid. The oleic/linoleic relation decreased justifying further research correlating storage and oxidative stability. (author)

  14. Exhaust lead-acid batteries recycling as a tool of the environmental protection policy. Energy, environmental and economic issues; Il riciclaggio delle batterie al piombo-acido esauste come strumento della politica di salvaguardia ambiental. Aspetti energetici, ambientali ed economici

    Energy Technology Data Exchange (ETDEWEB)

    Picini, P.; Battista, A. [ENEA, Divisione Caratterizzazione dell' Ambiente e del Territorio, Centro Ricerche Casaccia, S. Maria di Galeria, RM (Italy)

    2001-07-01

    Lead is an heavy metal that has a major impact on human health and his removal from the environment is an important action for its protection. The aim of the present work is to provide a framework of the Italian lead recycling with respect to the economic and environmental aspects of COBAT activities (COBAT is the Mandatory Consortium to collect and recycle the exhaust lead-acid batteries and lead wastes). In order to better understand the context in which COBAT works, some statistical data on the lead production, consumption and end uses in Italy and in the world are provided. An estimate of the energy consumptions and the environmental impact related to Italian lead production was also carried out. [Italian] Il piombo e' uno dei metalli pesanti a maggiore impatto ambientale e sanitario e la sua rimozione dall'ambiente costituisce un'importante azione di protezione e tutela della salute umana. Lo scopo del presente lavoro e' quello di fornire un quadro di riferimento relativo al riciclaggio del piombo in Italia evidenziandone gli aspetti ambientali ed economici in relazione alle attivita' condotte dal COBAT (Consorzio Obbligatorio delle Batterie Esauste e dei rifiuti piombosi). In tal senso, per disporre di una visione piu' completa del contesto in cui si inserisce l'attivita' del Consorzio, vengono forniti alcuni dati di carattere statistico sulla produzione, sul consumo e sugli utilizzi del piombo in Italia e nel mondo e viene effettuata una stima dei consumi energetici e dell'impianto ambientale associati alla produzione di piombo nazionale.

  15. Phosphorus in chronosequence of burnt sugar cane in Brazilian cerrado: humic acid analysis by {sup 31}P NMR; Fosforo em cronossequencia de cana-de-acucar queimada no cerrado goiano: analise de acidos humicos por RMN de {sup 31}P

    Energy Technology Data Exchange (ETDEWEB)

    Rossi, Celeste Q.; Pereira, Marcos G.; Garcia, Andreas C., E-mail: mgervasiopereira@gmail.com [Universidade Federal Rural do Rio de Janeiro (UFRRJ), Seropedica, RJ (Brazil). Dept. de Solos; Perin, Adriano; Gazolla, Paulo R. [Instituto Federal de Educacao, Ciencia e Tecnologia Goiano, Rio Verde, GO (Brazil); Gonzalez, Antonio P. [Universidade de Coruna, ES (Spain). Faculdad de Ciencias

    2013-10-01

    The aim of this study was to identify, with the use of {sup 31}P NMR spectroscopy, organic P species in humic acids (HA) in samples from Oxisol cultivated in chronosequence with sugar cane, pasture and Cerrado. The main forms of P-type found were orthophosphate, monoester-P (phosphate sugars) and P-diester (orthophosphate). The {sup 31}P NMR technique proved capable of identifying changes in the areas studied as a function of sugar cane burning time. In areas with 1 and 5 years of burnt cane, a decrease in recalcitrant organic P in humic acids indicated the need for use of P-humic substances for plant nutrition (author)

  16. Study of the reaction between {sup 51}CrO{sub 3} and concentrated nitric acid by radio chromatographic methods; Estudo da reacao entre {sup 51}CrO{sub 3} e acido nitrico concentrado por metodos radiocromatograficos

    Energy Technology Data Exchange (ETDEWEB)

    Pezzin, Sergio H. [Univesidade do Estado de Santa Catarina (UDESC), Joinville, SC (Brazil). Centro de Ciencias Tecnologicas; Collins, Carol H.; Collins, Kenneth E. [Universidade Estadual de Campinas, SP (Brazil). Inst. de Quimica

    2000-07-01

    The objective of the present work is to verify the reduction of CrO{sub 3} in concentrated nitric acid, using {sup 51}Cr as a tracer. For the study, {sup 51}CrO{sub 3} (ca. 200,000 cpm/mg) was added to 65% HNO{sub 3} and maintained under agitation at 20 deg C for specified time periods. Aliquots (100 {mu}) were analyzed by open column cation (AG50Wx8, 100-200 mesh, Na{sup +} form) chromatography, either immediately or after dilution to approximately pH 2 and storage for specified time periods. The separations, which were made by stepwise elution using HClO{sub 4} and Ca(ClO{sub 4}){sub 2} solutions as effluents with fraction collection, followed by counting with a NaI(Tl) detector and a single channel analyzer. It was verified that ca. 3.5% of Cr(III) is obtained after 15 min of reaction. The major reaction product is hexaaquo chromium(III), with minor concentrations of mononitrate penta-aquochromium(III), [Cr(H{sub 2}O){sub 5}NO{sub 3}]{sup 2+}, a product which undergoes watering at pH 2 to produce, after 360 h, [Cr(H{sub 2}O){sub 6}]{sup 3+}. (author)

  17. Study of the nitric acid influence on the production of Ce O{sub 2} with high specific surface area; Estudo da influencia do acido nitrico na obtencao de CeO{sub 2} com alta area superficial especifica

    Energy Technology Data Exchange (ETDEWEB)

    Albanez, Nelma Kunrath; Bressiani, Jose Carlos [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil)

    1996-12-31

    The cerium oxide (Ce O{sub 2}) main characteristics for use as catalyst in an exhaust gases purification system are: high specific surface area (approximately 30 m{sup 2}/g after calcination at 800 deg C/ 2 hs), and thermal stability. The Ce O{sub 2} powders obtained by conventional route, i.e., precipitation, and submitted high temperature (800 deg C) heat treatments, showed low specific surface area. In this work nitric acid effects on the Ce O{sub 2} surface area values were investigated. The variables studied were nitric acid concentration, humidity content in the raw material, re pulp after leaching, addition of hydrogen peroxide (H{sub 2} O{sub 2}) and starting material specific surface area. By this process, it was possible to obtain powders with specific surface area larger than 40 m{sup 2}/g, after treatment at 800 deg C during two hours. (author) 8 refs., 3 figs., 1 tab.

  18. 15-demethylisoplumieride acid, a new iridoid isolated from the bark of Plumeria rubra and latex of Himatanthus sucuuba; Acido 15-desmetilisoplumierideo, um novo iridoide isolado das cascas de Plumeria rubra e do latex de Himatanthus sucuuba

    Energy Technology Data Exchange (ETDEWEB)

    Barreto, Alaide de Sa; Amaral, Ana Claudia F. [Fundacao Inst. Oswaldo Cruz (FIOCRUZ), Rio de Janeiro, RJ (Brazil). Instituto de Tecnologia em Farmacos -Farmanguinhos. Lab. de Plantas Medicinais e Derivados; Silva, Jefferson Rocha de A. [Universidade Federal do Amazonas, Manaus, AM (Brazil). Dept. de Quimica]. E-mail: jrocha_01@ufam.edu.br; Schripsema, Jan [Universidade Estadual do Norte Fluminense (UENF), Campos dos Goytacazes, RJ (Brazil). Setor de Quimica de Produtos Naturais; Rezende, Claudia M.; Pinto, Angelo C. [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Inst. de Quimica

    2007-09-15

    Himatanthus sucuuba and Plumeria rubra are used in folk medicine in Brazil to treat various ailments. The isolation of the new iridoid 15-demethylisoplumieride from the bark of Plumeria rubra L. var. acutifolia (Ait) Woodson and latex of Himatanthus sucuuba (Spruce) Woodson is reported. Other iridoid glycosides were obtained from both plants. The structures of these substances were elucidated by spectral analysis and comparison with data already reported. (author)

  19. Polymeric blends from post-consumer PET and polyester becoming of glycerol and phthalic acid; Misturas polimericas a partir do PET pos-consumo e poliesteres derivados do gliceraol e acido ftalico

    Energy Technology Data Exchange (ETDEWEB)

    Miranda, C.S.; Brioude, M.; Fiuza, R.P.; Luporini, S.; Carvalho, R.F.; Jose, N.M., E-mail: cleidienesm@gmail.co [Universidade Federal da Bahia (GECIM/UFBA), Salvador, BA (Brazil). Inst. de Quimica. Grupo de Energia e Ciencias dos Materiais

    2010-07-01

    Preparation of physical mixture or polymer blends is a very important method to obtain a final product with excellent balance of properties, where one component can compensate for the poor property of another, and is often a modified low cost compared to development and synthesis of a new polymer. PET has become a major waste of post-consumer plastics and aiming to remedy this problem, this work aims to obtain blends from recycled PET and polyesters derived from glycerol and phthalic acid. The material with higher proportion of PET showed better thermal properties, observed by TGA and DSC, with a similar profile of pure PET. In XRD analysis showed a semicrystalline, while the SEM is a smooth surface on all materials, characteristic of pure polyester. The ratio of 50% its surface showed a probable immiscibility of polymers. (author)

  20. Modeling of an immobilized lipase tubular reactor for the production of glycerol and fatty acids from oils; Modelado de un reactor tubular de lipasas inmovilizadas para la produccion de glicerol y acidos grasos a partir de aceites

    Energy Technology Data Exchange (ETDEWEB)

    Oddone, S.; Grasselli, M.; Cuellas, A.

    2010-07-01

    Advances in the design of a bioreactor in the fats and oils industry have permitted the hydrolysis of triglycerides in mild conditions and improved productivity while avoiding the formation of unwanted byproducts. The present work develops a mathematical model that describes the hydrolytic activity of a tubular reactor with immobilized lipases for the production of glycerol and fatty acids from the oil trade. Runge Kuttas numerical method of high order has been applied, considering that there is no accumulation of the substratum in the surface of the membrane, where the enzyme is. At the same time, different equations based on the kinetic model of Michaelis Mentens and the Ping-Pong bi-bi mechanism were examined. Experimental data in discontinuous systems are the basis for the development of the quantitative mathematical model that was used to simulate the process computationally. The obtained results allow for optimizing both the operative variables and the economic aspects of industrial processes. (Author)

  1. Modification of zirconium diphosphate with salicylic acid and its effect on the uranium (Vi) sorption; Modificacion del difosfato de circonio con acido salicilico y su efecto sobre la sorcion de uranio (VI)

    Energy Technology Data Exchange (ETDEWEB)

    Almazan T, M. G.; Garcia G, N. [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico); Simoni, E., E-mail: guadalupe.almazan@inin.gob.mx [Universidad Paris Sud, Instituto de Fisica Nuclear, Georges Clemenceau No. 15, Orsay (France)

    2014-10-15

    The surface of zirconium diphosphate (ZrP{sub 2}O{sub 7}) was modified with salicylic acid and its effect was evaluated on the uranium (Vi) sorption. The modified surface of the material was analyzed with different analytical techniques among which are included the atomic force microscopy, scanning electron microscopy and X-ray photoelectron spectroscopy. This analysis allowed showing that the salicylic acid is being held on the surface of the zirconium diphosphate. The reactivity of modified zirconium diphosphate compared with uranium (Vi) was investigated using the classical method of batch sorption. The analysis of sorption isotherms shows that the salicylic acid has an important effect in the uranium (Vi) sorption. According to the study conducted, the interaction among the uranium (Vi) and the surface of zirconium diphosphate modified with the salicylic acid most likely leads to the complexes formation of binary (U(Vi)/ZrP{sub 2}O{sub 7}) and ternary (U(Vi)/salicylate/ZrP{sub 2}O{sub 7}) surface. (Author)

  2. Impregnation of 12-tungstophosphoric acid on silica - part I: determination of impregnation parameters, characterization and evaluation of catalytic activity; Impregnacao do acido 12-fosfotungstico em silica - parte I: determinacao de parametros de impregnacao, caracterizacao e avaliacao da atividade catalitica

    Energy Technology Data Exchange (ETDEWEB)

    Scroccaro, Karine Isabel; Tanobe, Valcineide Oliveira de Andrade; Cocco, Lilian Cristina; Yamamoto, Carlos Itsuo, E-mail: karineisabel@yahoo.com.br [Universidade Federal do Parana, Curitiba, PR (Brazil). Centro Politecnico. Dept. de Engenharia Quimica; Wypych, Fernando [Universidade Federal do Parana, Curitiba, PR (Brazil). Centro Politecnico. Dept. de Quimica

    2012-07-01

    Catalyst based on Kegging-type heteropolyacids (H{sub 3}PW{sub 12}O{sub 40} - HPA), supported on SiO{sub 2} (H{sub 3}PW), were prepared by the impregnation method under different thermal treatment conditions. The materials were characterized by different instrumental techniques and used as catalysts in the methyl esterification reactions of stearic acid. Using the catalyst with 15% of HPA, conversions higher than 60% were obtained after 2 h of reaction at 65 deg C. Recovery studies using hot-filtration with ethanol at 75 deg C showed satisfactory activity for two additional reaction cycles. (author)

  3. Evaluation of human dental loss caused by carbamide peroxide bleacher compared with phosphoric acid conditioning - radioactive method; Avaliacao da perda dental humana com o uso do clareador peroxido de carbamida comparado ao condicionamento com acido fosforico - metodo radiometrico

    Energy Technology Data Exchange (ETDEWEB)

    Adachi, Eduardo Makoto; Yousseff, Michel Nicolau [Sao Paulo Univ., SP (Brazil). Faculdade de Odontologia. Dept. de Dentistica; Saiki, Mitiko [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil). Lab. de Analise por Ativacao Neutronica

    2002-07-01

    The radiometric method was applied to the evaluation of dental loss caused by carbamide peroxide when it is applied on the surface layers of enamel and dentin tissues. Also the dental loss caused by the etching with 37% phosphoric acid procedure used in aesthetic restoration was assessed for comparison with those results obtained. The tooth samples irradiated with a P standard in a thermal neutron flux of the nuclear reactor were placed in contact with 10% carbamide peroxide or with 37% phosphoric acid solution. The radioactivity of {sup 32} P transferred from the radioactive teeth to the bleaching gel or to etching acid was measured using a Geiger Muller detector to calculate the mass of P removed in this treatment and losses were calculated after obtaining their P concentrations. Results obtained indicated that enamel and dentin exposed to carbamide peroxide bleaching agent lose phosphorus. The extent of enamel loss was smaller than that obtained for dentin. In the case of acid etching, there was no difference between the results obtained for enamel and dentin loss. Also the dentin loss obtained after a treatment of 30 applications of 10% carbamide peroxide was the same magnitude of that one application of 37% phosphoric acid. (author)

  4. Morphology and thermal degradation study of poly(lactic acid)/synthetic mica composites; Estudo da morfologia e da degradacao termica de compositos de poli(acido latico)/mica sintetica organofilica

    Energy Technology Data Exchange (ETDEWEB)

    Souza, D.H.S.; Dias, M.L., E-mail: diegosaboya@ima.ufrj.b [Universidade Federal do Rio de Janeiro (IMA/UFRJ), RJ (Brazil). Inst. de Macromoleculas Professora Eloisa Mano

    2010-07-01

    Poly(lactic acid) (PLA)/synthetic mica composites has been little studied in the literature. In this work, an organophilic synthetic mica was used to prepare PLA nanocomposites. The composites were obtained at an internal mixer containing 3, 5, 7 and 10 wt% of mica. The materials were analyzed by x-ray diffraction, thermogravimetric analysis and gel permeation chromatography. (author)

  5. Resistance to acid attack of portland cement mortars produced with red mud as a pozzolanic additive; Resistencia ao ataque acido de argamassas de cimento Portland produzido com residuo de bauxita como aditivo pozolanico

    Energy Technology Data Exchange (ETDEWEB)

    Balbino, Thiago Gabriel Ferreira; Fortes, Gustavo Mattos; Lourenco, Rafaela Roberta; Rodrigues, Jose de Anchieta [Universidade Federal de Sao Carlos (DEMa/PPGCEM/UFSCar), SP (Brazil). Programa de Pos-Graducao em Ciencia e Engenharia de Materiais. Departamento de Engenharia de Materiais; Montini, Marcelo [Alcoa Aluminio S.A., Pocos de Caldas, MG (Brazil)

    2011-07-01

    Portland cement structures are usually exposed to aggressive environments, which requires the knowledge of the performance of these materials under deleterious conditions. In this study, it was evaluated the resistance to acid attack of mortars that contain ordinary (CPI) and compost (CPII-Z) Portland cements, adding to the first red mud (RB) as a pozzolanic additive in different conditions: without calcination, calcined at 400 ° C and at 600 ° C. The specimens were subjected to HCl and H{sub 2}SO{sub 4} solutions, both with concentration of 1.0 Mol L{sup -1} for 28 days, monitoring the weight loss and leached material nature by atomic emission inductively coupled plasma (ICP). The hydration products were studied by thermogravimetric analysis (TGA) and X-ray diffraction (XRD) of the hydrated cement pastes. It was observed a reduction of portlandite amount in the RB containing cement pastes, indicating a possible pozzolanic activity of the red mud. The mortars prepared with RB were more resistant to HCl, while that ones with calcined RB present a better performance in H{sub 2}SO{sub 4} attack. (author)

  6. Efeito da concentração de acido, umidade e temperatura na hidrolise de amido de mandioca por extrusão termoplastica visando a produção de alcool

    OpenAIRE

    1989-01-01

    Resumo: Tem-se conhecimento que a produção de álcool a partir de amido de mandioca tornou-se economicamente inviável, devido ao processo requerer um alto consumo de energia e uso de grande quantidade de água e de enzima α-amilase e amiloglicosidase na etapa de gelatinização, liquefação e sacarificação do amido. Entretanto, a extrusão termoplástica é considerada uma tecnologia que permite a gelatinização e dextrinização de materiais amiláceos a seco com baixo consumo de energia. Portanto, o ob...

  7. Preparation of polymer blends from glycerol, fumaric acid and of poly(ethylene terephthalate) (PET) recycled; Preparacao de blendas polimericas a partir do glicerol, acido fumarico e do politereftalato de etileno (PET) pos consumo

    Energy Technology Data Exchange (ETDEWEB)

    Medeiros, Marina A.O.; Guimaraes, Danilo H.; Brioude, Michel M.; Jose, Nadia M. [Instituto de Quimica, Universidade Federal da Bahia, Salvador, BA (Brazil); Prado, Luis A.S. de A. [Institut fuer Kunststoffe und Verbundwerkstoffe - Technische Universitaet Hamburg-Harburg, Hamburg (Germany)

    2011-07-01

    Polymer blends based on recycled poly(ethylene terephthalate) (PET) and poly(glycerol fumarate) polyesters were prepared in different PET concentrations. The PET powder was dispersed during the poly(glycerol fumarate) synthesis at 260 deg C. The resulting blends were characterized by X-ray diffraction. The thermal stability of the materials was evaluated by thermogravimetric analysis and differential scanning calorimetry. The morphology was studies by scanning electron microscopy. The blends were clearly immiscible. The possibility of (interfacial) compatibilization of the PET domains, caused by transesterification reactions between PET and glycerol were discussed. (author)

  8. Aspectos moleculares da fração acida de querosene de aviação : sintese de padrões (fenolicos, acidos carboxilicos e neutros) para analise em cromatografia gasosa acoplada a espectrometria de massas

    OpenAIRE

    Joana D'Arc Felix de Sousa

    1990-01-01

    Resumo: O petróleo Cabiúnas, proveniente da Bacia de Campos, possui um índice de acidez considerável (IA = 1,0), classificando-o como petróleo de acidez média para alta. Sabemos que as frações do petróleo, Querosene de Aviação (QAV) e Gasolina, são obtidas numa faixa de ebulição (250-300°C) semelhante à faixa de destilação dos ácidos naftênicos (200-370°C). Este fato nos motivou a estudar a fração ácida do Querosene de Aviação em uma confirmação de resultados anteriores, deste laboratório. A ...

  9. Sterols and fatty acids analysis at the Llobregat River for a wastewater dumping episode; Analisis de esteroles y acidos grasos en el rio Llobrgat por un vertido de aguas residuales

    Energy Technology Data Exchange (ETDEWEB)

    Romero-Lacal, J.; Garcia-Mendi, C.; Vega, A.; Pujadas, M.

    2006-07-01

    The study by gas chromatography (HRGC) and mass spectrometry (MS) of fatty acids and sterols of water samples from Anoia and Llobregat River, allowed to rule out the hypothesis of the Anoia River as the cause of dumping episode and even to determine that the episode was not associated to the faecal or residual contamination. Nevertheless, it has permitted us to have a better knowledge of these families of organic compounds in the basin of the Llobregat River. In the acidic fraction, saturated and unsaturated fatty acids of 14, 16 and 18 atoms of carbon from oil fish, animal fat or hydrogenated oils with industrial and domestic use were found. The application of different sterols indices (coprostanol, cholesterol, cholestanol, stigmasterol, stigmastadienol and sitosterol) permitted us to study the role of the sterols and the significance of the contamination from animal sterols, fitosterols in the studied samples. (Author) 19 refs.

  10. 基于BP神经网络的污泥酸性发酵过程预测%Prediction of Sludge Acido-Genic Fermentation Process Based on BP Neural Network

    Institute of Scientific and Technical Information of China (English)

    石杰; 宋秀兰; 李亚新

    2015-01-01

    为了预测污泥产酸能力及产酸组成,对生物脱氮除磷过程所需的碳源投加量的计算有意义.用两种BP神经网络模型对采用半连续运行方式的污泥酸性发酵过程进行预测.结果表明,8-23-4BP网络除乙酸产率以外,丙酸产率、容积产酸能力、丁酸产率预测值与实测值相关系数都大于0.9,各目标变量预测值与实测值平均相对误差都小于15%;7-22-4BP网络乙酸产率、丙酸产率、丁酸产率、容积产酸能力预测值与实测值相关系数都大于0.9,各目标变量预测值与实测值平均相对误差都小于13%.7-22-4BP模型网络预测性能优于8-23-4BP网络模型.8-23-4BP模型对污泥丙酸产率预测更精确.两种BP神经网络模型可以实现对污泥酸性发酵过程产酸量的预测.实验结果可为污水处理厂污泥酸性发酵的在线控制提供参考.

  11. ({sup 1} H, {sup 13} C and {sup 31} P) NMR of phosphonic acid derivatives; Ressonancia magnetica nuclear ({sup 1} H, {sup 13} C, {sup 31} P) de derivados do acido fosfonico

    Energy Technology Data Exchange (ETDEWEB)

    Campos, Valdevino; Costa, Valentim E. Uberti [Rio Grande do Sul Univ., Porto Alegre, RS (Brazil). Inst. de Quimica

    1991-12-31

    In the last years the development of phosphates analogues in the medical and agricultural pesticides has being very expressive. {sup 1} H, {sup 13} C and mainly {sup 31} P NMR are used for stereochemical and conformational analysis, and reactivity studies on the compounds resulting from those chemical processes 2 refs., 4 figs., 1 tab.

  12. Characterization of peat and humic acid in the margins of Mogi-Guacu river, Sao Paulo state, Brazil; Caracterizacao da turfa e dos acidos humicos das margens do rio Mogi-Guacu, SP

    Energy Technology Data Exchange (ETDEWEB)

    Prado, Alexandre G.S.; Rezende, Mara O. de O. [Sao Paulo Univ., Sao Carlos, SP (Brazil). Inst. de Quimica. Lab. de Radioquimica e Quimica Ambiental

    1999-07-01

    The slow chemical and microbiological decomposition of flooded soils form a material with high proportion of organic matter known as peat. The presence of favorable areas for peat formation is a characteristic of the Brazilian territory; even so, the potential of this material is seldom used. Peat can be used as a fertilizer complement in agriculture, as source of energy, and as a pollutant extractor. The peat samples studied were collected in the margins of the Mogi Guacu river, in Sao Paulo state. The peat samples and the humic acids extracted from peat were characterized by several techniques. The results showed that the material can be applied in agriculture and presents a great potential for removal of environmental contaminants, besides being a good source of humic acids. (author)

  13. Chemical characterization of composites developed from glycerol and dicarboxylic acids rein forced with piassava fiber; Caracterizacao quimica de compositos desenvolvidos a partir do glicerol e acidos dicarboxilicos reforcados com fibra de piacava

    Energy Technology Data Exchange (ETDEWEB)

    Miranda, Cleidiene S.; Oliveira, Jamerson C.; Guimaraes, Danilo H.; Jose, Nadia M., E-mail: cleidienesm@gmail.com [Universidade Federal da Bahia, Instituto de Quimica, GECIM - Programa de Pos-Graduacao em Engenharia Quimica, Salvador, BA (Brazil); Carvalho, Ricardo F. [Universidade Federal da Bahia, Escola Politecnica, Mestrado em Engenharia Ambiental Urbana, Salvador, BA (Brazil)

    2011-07-01

    In search of alternative technologies that enable the use of products with lower environmental impact, This study aims to develop a composite polymer-based piassava fiber. The sludge, waste and byproduct of commercial uses currently being used as reinforcement in polymer matrices, due to presence of lignocellulosic materials. The matrix polymer used was synthesized from glycerol with dicarboxylic acids, in order to open future perspectives on the use of glycerin generated from purified biodiesel production plastics. Composites with 2, 5, 10 wt% of piassava fiber cut into 5 mm raw and treated were obtained a mixture of solution. The materials were characterized by TGA, DSC, XRD and SEM. It was observed that the material under study is promising for the industrial market, because it has good compatibility with natural fibers allowing wider application of fiber natural and glycerol, producing semicrystalline composites and with good thermal properties. (author)

  14. Behavior of uranium isotopes along a tidal cycle in a study affected by acid mine drainage; Comportamiento de los isotopos de uranio a lo largo de un ciclo mareal en un estuario afectado por denaje acido de minas

    Energy Technology Data Exchange (ETDEWEB)

    Hierro, A.; Martin, J. e.; Olias, M.; Garcia, C.; Bolivar, J. P.

    2013-07-01

    The Tinto and Odiel rivers converge in an estuarine system known as the Ria de Huelva, which is an ecosystem of great interest, conditioned by hydrochemical facts. The main objective of this study was to analyze the behavior of uranium isotopes in the waters of the Red River estuary in a tidal cycle under hydrochemical conditions of high gradients of salinity and pH generated by the acidic waters of the Rio Tinto and seawater. (Author)

  15. Influence of several nonferrous metals in the treatment of residual liquors from hydrochloric acid pickling processes. Influencia de diversos metales no ferreos en el tratamiento de lejias residuales de decapado con acido clorhidrico

    Energy Technology Data Exchange (ETDEWEB)

    Negro, C.; Cobos, M.A.; Latorre, R.; Dufour, J.; Formoso, A.; Lopez, F.

    1994-01-01

    In the oxiprecipitation of waste liquors from siderurgical processes of pickling with hydrochloric acid, several kinds of iron oxides and oxihydroxides are obtained: alpha-FeOOH, gamma-FeOOH, Fe[sub 3]O[sub 4], gamma-Fe[sub 2]O[sub 3]. Fe[sub 2]O[sub 3].1,2H[sub 2]O, etc. These products can be used like pigments in the painting industry and like raw materials for the obtaining of ferrites. Varying the operation conditions, the presence of these products can be changed greatly, obtaining different mixtures of them. The presence of non-ferrous metals catalyzes and modifies the mechanism of the reaction, yielding pure products. This simplifies their later industrial applications. The aim of this work is to determine the influence of Cu(II), Zn(II), Mo(VI) and Al(III) on the oxiprecipitation of residual liquors from hydrochloric acid pickling processes, selecting the most favourable operation conditions at which it is possible to obtain products for industrial applications.

  16. Effect of glycerin and formic acid in the efficiency of deposit on Zn-Ni, obtained by electrodeposition; Efeito da glicerina e do acido formico na eficiencia de deposito da liga Zn-Ni, obtido atraves de eletrodeposicao

    Energy Technology Data Exchange (ETDEWEB)

    Pedroza, G.A.G.; Souza, C.A.C.; Lima, L.R.P.A.; Ferreira, D.M. [Universidade Federal da Bahia - Escola Politecnica, BA (Brazil)

    2010-07-01

    Additives are added to the electrodeposition of metal coatings to improve the characteristics of the deposit. However, the objective was to investigate the effect of adding glycerin and formic acid in the deposition efficiency and deposit structure of zinc-nickel alloy obtained by electrodeposition. The depositions were made at a galvanostatic current density of 10 mA/cm{sup 2} to obtain a deposit of about 5 mm in thickness. The deposition efficiency was determined through measures of mass, chemical composition of the deposit in the presence and absence of additives was examined by X-ray Spectrometer Fluorescence (XRF) and surface characterization of coatings was performed by Scanning Electron Microscopy (SEM). The high levels of glycerin (0,07 M) and formic acid (0,26 M) in bath deposition increased the deposition efficiency of around 10% to 12% by mass, respectively. (author)

  17. Influence of acids composition in the properties of poly(glycerol citrate-co-adipate); Influencia da composicao dos acidos nas propriedades do poli(glicerol citrato-co-adipato)

    Energy Technology Data Exchange (ETDEWEB)

    Brioude, M.M.; Pereira, R.; Fiuza, R.P.; Jose, N.M., E-mail: mbrioude@gmail.co [Universidade Federal da Bahia (UFBA), Salvador, BA (Brazil). Inst. de Quimica

    2010-07-01

    Synthetic polymers are highly resistant to degradation, being one of the greatest responsible for environment pollution. Consequently, an increase in biodegradable polymers research and development is happening. In this work we propose the synthesis and characterization of polyesters potentially biodegradable using glycerol, citric acid (CA) and adipic acid (AD). The polyesters were prepared by adding the reactants in molar ratio between glycerol:acids (1:1,5), but changing the acids ratio. The system was heated to 150-160 deg C, under nitrogen atmosphere and magnetic stirring, without catalyst adding. The samples were characterized by TGA, DSC, FTIR, XRD e SEM. The results show that the polymers prepared are amorphous polyesters, with two thermal events in 250 deg C and 450 deg C and the surfaces presents smooth and rough regions refers to bonds between glycerol and CA or AD, respectively. (author)

  18. Treatment effect with hydrogen peroxide and/or stannous chloride in incubate cell culture with glucoheptonic acid; Efeito do tratamento com peroxido de hidrogenio e/ou cloreto estanoso em cultura celular encubada com acido glucoheptonico

    Energy Technology Data Exchange (ETDEWEB)

    Assis, M.L.B.; Silva, F.C.P. da; Caldeira de Araujo, A.; Valsa, J.O. [Universidade do Estado, Rio de Janeiro, RJ (Brazil). Inst. de Biologia; Bernardo Filho, M. [Instituto Nacional do Cancer, Rio de Janeiro, RJ (Brazil). Centro de Pesquisa Basica

    1995-12-31

    The stannous salt (Sn Cl{sub 2}) can be found in an associated form with another molecules, as in the kits for the production of {sup 99m} technetium labeled radiopharmaceuticals, widely employed in nuclear medicne procedures. Here, it was described the results obtained with treatment of an Escherichia coli AB1157 culture with Sn CL{sub 2} [5,5 x 10{sup -5} M] associated to the radiopharmaceuticals glucoheptonic acid (GHA). Our results show a culture`s protection in differents concentrations of GHA [2 x 10{sup -}2 M], [4 x 10{sup -2} M], [1 x 10{sup -1} M] and [2 x 10{sup -1} M], eliminating, almost completely, the lethal effect of the Sn CL{sub 2}. The culture survival was not affected when submitted only to GHA (control) solution. When the culture was submitted to hydrogen peroxide (H{sub 2} O{sub 2}) [2 x 10{sup -2} M] associated to the same concentration of GHA, we did not obtain protection, suggesting, a chelating action of GHA on the stannous ions. Further experiments associating Sn Cl{sub 2} [5,5 x 10{sup -5} M] + H{sub 2} O{sub 2} [2 x 10{sup -2} M] + GHA [4 x 10{sup -2} M] tend to confirm this result, as well as to suggest the sinergistic effect between the Sn Cl{sub 2} and the H{sub 2} O{sub 2}. (author). 20 refs, 3 figs.

  19. Combustion synthesis by reaction and characterization of nano ferrites: study of fuel aniline, citric and its mixture; Sintese por reacao de combustao e caracterizacao de nanoferritas Ni-Zn: estudo dos combustiveis anilina, acido citrico e sua mistura

    Energy Technology Data Exchange (ETDEWEB)

    Silva, M.C. da; Coutinho, J.P.; Costa, A.C.F.M., E-mail: normanda@ufcg.edu.br [Universidade Federal de Campina Grande (UFCG), PB (Brazil). Unidade Academica de Engenharia de Materiais; Kiminami, R.H.G.A. [Universidade Federal de Sao Carlos (UFSCar), SP (Brazil). Departamento de Engenharia de Materiais; Freitas, N.L. de [Universidade Federal de Campina Grande (UFCG), PB (Brazil). Unidade Academica de Tecnologia do Desenvolvimento

    2012-07-01

    The present study aims to evaluate the influence of aniline and citric acid used alone and combined in a ratio of 50% each in the characterization of NiZn ferrite synthesized by combustion reaction method in a muffle furnace. Measurements were made of temperature and reaction time. The nano-powders were characterized by XRD, EDX, textural analysis and SEM. The highest temperature was achieved by the reaction using the mixture of fuel and increased reaction time using citric acid. The nano ferrites using different fuels, and the mixture changed phases, the crystallite size and decreased surface area of the samples with aniline, citric acid and a mixture of both, respectively. The powder morphology ranged from presenting the formation of irregular blocks for the use of citric agglomerated in the form of skeins with aniline and a mixture to agglomerate larger particles. (author)

  20. Influence of zeolite treated with sulphuric acid and sodium hydroxide on the coagulation-flocculation process of drainage. Influencia de la zeolita tratada con acido sulfurico y con hidroxido de sodio en el proceso de coagulacion floculacion en aguas superficiales

    Energy Technology Data Exchange (ETDEWEB)

    Gutierrez Duque, M.; Herrera Vasconcelos, T.; Laria Piedra, N.

    1994-01-01

    The present paper has had as objective the treatment of natural zeolite from Tasajera with sulfuric acid and sodium hydroxide (residuals acid and basic from the regeneration of cationic and anionic resins of the ''Otto Parallada'' thermoelectric plant) at different times and concentrations, with a further comparison and testing of the effectiveness of the obtained zeolite in respect to the natural one as a coadyuvant of the coagulation-flocculation process in the treatment of superficial water. (Author)

  1. Hydrometallurgical route to recover molybdenum, nickel, cobalt and aluminum from spent hydrotreating catalysts in acid medium; Rota hidrometalurgica de recuperacao de molibdenio, cobalto, niquel e aluminio de catalisadores gastos de hidrotratamento em meio acido

    Energy Technology Data Exchange (ETDEWEB)

    Valverde Junior, Ivam Macedo; Paulino, Jessica Frontino; Afonso, Julio Carlos [Universidade Federal do Rio de Janeiro (UFRJ), RJ (Brazil). Inst. de Quimica. Dept. de Quimica Analitica]. E-mail: julio@iq.ufrj.br

    2008-07-01

    This work describes a hydrometallurgical route for processing spent commercial catalysts (CoMo and NiMo/Al{sub 2}O{sub 3}). Samples were preoxidized (500 deg C, 5 h) in order to eliminate coke and other volatile species present. The calcined solid was dissolved in concentrated H{sub 2}SO{sub 4} and water (1:1 vol/vol) at 90 de C; the insoluble matter was separated from the solution. Molybdenum was recovered by solvent extraction using tertiary amines at pH around 1.8. Cobalt (or nickel) was separated by addition of aqueous ammonium oxalate at the above pH. Phosphorus was removed by passing the liquid through a strong anion exchange column. Aluminum was recovered by neutralizing the solution with NaOH. The route presented in this work generates less final aqueous wastes because it is not necessary to use alkaline medium during the metal recovery steps. (author)

  2. Oscillatory dynamics in systems containing bromate and 1,4-cyclohexanedione in acidic media. I. The effect of temperature; Dinamica oscilatoria em sistemas contendo bromato e 1,4-ciclo-hexanodiona em meio acido. I. Efeito da temperatura

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Hyrla C.L.; Oliveira, Tatiane B.; Varela, Hamilton, E-mail: varela@iqsc.usp.br [Instituto de Quimica de Sao Carlos, Universidade de Sao Paulo (IQSC/USP), Sao Carlos, SP (Brazil)

    2012-07-01

    We present in this work the influence of temperature on the dynamics of homogeneous chemical systems containing bromate and 1,4-cyclohexanedione (1,4-CHD) in acidic media. In particular, the following systems were studied: bromate/1,4-CHD/acid, bromate/1,4-CHD/ferroin/acid and bromate/1,4-CHD/trisbipyridine ruthenium/acid. Investigations were carried out by means of an electrochemical probe, at five temperatures between 5 and 45 degree C. Activation energies (Ea) were estimated in different ways for the pre-oscillatory and oscillatory regimes. In any case, the Ea was found to depend on the catalyst, composition and initial concentrations. In addition, it was observed that ferroin and trisbipyridine ruthenium act as catalysts only during the transition between the induction period and oscillatory regime. (author)

  3. Evaluation of gamma irradiation effects on carotenoids, ascorbic acid and sugar contents of buriti fruit (Mauritia flexuosa L.); Avaliacao dos efeitos da radiacao gama nos teores de carotenoides, acido ascorbico e acucares do fruto Buriti do Brejo (Mauritia flexuosa L.)

    Energy Technology Data Exchange (ETDEWEB)

    Lima, Antonio Luis dos Santos [Instituto Militar de Engenharia (IME), Rio de Janeiro, RJ (Brazil). Secao de Engenharia Quimica, Quimica Organica e de Produtos Naturais], e-mail: santoslima@ime.eb.br; Lima, Keila dos Santos Cople; Silva, Jaqueline Michele [Instituto Militar de Engenharia (IME), Rio de Janeiro, RJ (Brazil). Secao de Engenharia Nuclear. Irradiacao de Alimentos], e-mail: keila@ime.eb.br, e-mail: jaquelinefisica@bol.com.br; Coelho, Maysa Joppert [Instituto Militar de Engenharia (IME), Rio de Janeiro, RJ (Brazil). Secao de Engenharia Nuclear. Engenharia Ambiental], e-mail: maysa@ime.eb.br; Godoy, Ronoel Luiz de Oliveira [EMBRAPA Agroindustria de Alimentos, Rio de Janeiro, RJ (Brazil). Lab. de Cromatografia Liquida, Quimica Organica e de Produtos Naturais], e-mail: ronoel@ctaa.embrapa.br; Pacheco, Sidney [EMBRAPA Agroindustria de Alimentos, Rio de Janeiro, RJ (Brazil). Lab. de Cromatografia Liquida, Ciencia e Tecnologia de Alimentos], e-mail: sidney@ctaa.embrapa.br

    2009-07-01

    Buriti (Mauritia flexuosa L.), a typical fruit from the Northeast and Center-West Amazon of Brazil, is used in many regional dishes. It is considered an excellent source of carotenoids that are A vitamin precursors, showing a majority of beta-carotene. It also presents ascorbic acid and sugar contents. Many studies have indicated that the lack of A vitamin is the main cause of night blindness and xerophthalmia. Also, ascorbic acid deficiency may cause scorbutic disease. The use of food irradiation is growing and represents an economic benefit to agriculture through the reduction of post-harvesting losses while maintaining food nutritional quality. In this study, buriti in natura was treated with gamma irradiation with doses of 0.5 kGy and 1.0 kGy. The objective was to evaluate the irradiation effects on total carotenoids, ascorbic acid and sugars concentrations of buriti. The fruit was evaluated through the total carotenoids analysis, by spectrophotometry, and the carotenoids (alpha and beta-carotene and lutein), ascorbic acid and sugars were determined by high performance liquid chromatography (HPLC). The results showed that buriti is an excellent source of total carotenoids (44600 {mu}g/100 g). The irradiation of buriti with the dose of 0.5 kGy did not significantly change carotenoids and sugars contents. However, there was a reduction of ascorbic acid concentration with an increase of the dose, which may have been caused by irradiation or by intrinsic and extrinsic factors that alter ascorbic acid stability in food, converting ascorbic to dehydroascorbic acid, while keeping the C vitamin active form. (author)

  4. {sup 1} H and {sup 13} C NMR studies on the enoling of 5-benzyl barbituric acids; Estudos por H-1 e C-13 RMN da enolizacao de acidos 5-benzil barbituricos

    Energy Technology Data Exchange (ETDEWEB)

    Villar, Jose Daniel Figueroa; Santos, Nedina Lucia dos; Cruz, Elizabete Rangel [Instituto Militar de Engenharia (IME), Rio de Janeiro, RJ (Brazil). Secao de Quimica

    1991-12-31

    This work shows that the derivatives of the 5-benzyl barbituric acids hydroxylated at the ortho position of the aromatic ring only exist in the enol form. and that the alkylation of this hydroxyl gives products which exist mainly in the ketone form of the DMSO 5 refs., 2 figs., 2 tabs.

  5. Radiation characterization, physico-chemical and mineralogical materials associated with the production of phosphoric acid; Caracterizacion radiactiva, fisico-quimica y mineralogica de materiales asociados con la proudccion del acido fosforico

    Energy Technology Data Exchange (ETDEWEB)

    Pereira Ambrosio, E.; Gazquez Gonzalez, M.; Bolivar Raya, J. P.

    2011-07-01

    For over 20 years there is a clear awareness in the scientific community about the need to assess the occupational and environmental radiological impact caused by the activities of conventional nuclear industries (industries NORM). These are characterized either by use in their production processes raw materials rich in natural radionuclides, or by generating commercial products, by-products or residues enriched in these radionuclides. (Author)

  6. Influence of the addition of bentonite clay in poli (butylene adipate co-terephthalic) / poly(lactic acid) membranes; Influencia da adicao de argila bentonita em membranas de poli(butileno adipato co-tereftalico)/poli(Acido latico)

    Energy Technology Data Exchange (ETDEWEB)

    Morais, D.D.S.; Medeiros, K.M.; Araujo, E.M.; Melo, T.J.A. [Universidade Federal de Campina Grande (UAEMa/UFCG), PB (Brazil). Unidade Academica de Engenharia de Materiais; Barbosa, R., E-mail: dayannediniz@hotmail.com [Universidade Federal do Piaui (CT/UFPI), PI (Brazil). Centro de Tecnologia

    2014-07-01

    The processes of membrane separation have been used in many different sectors of industrial activity, ranging from the chemical industry, food, pharmaceutical, medical and biotech. In this paper, a bentonite clay was added by melt intercalation in a poly(butylene adipate-co-terephthalic acid)/poly(lactic acid) blend at levels 1 and 3 wt% of clay. After that, membranes were produced by solvent evaporation technique. From the XRD results, it was verified the possible formation of exfoliated/partially exfoliated structures in the membranes. By DSC, it was observed that the addition of clay did not promote alterations in glass transition temperature and crystalline melting of the PBAT/PLA matrix. The morphology of the membranes were observed by SEM and it was verified the clay formation of porous membranes. (author)

  7. Influence of -tocopherol on arachidonic acid deposition and peroxidation in Atlantic salmon (Salmo salar L.) fingerlings/Influencia del -tocoferol en la incorporacion y peroxidacion del acido araquidonico en alevines parr de salmon del Atlantico (Salmo salar L.)

    National Research Council Canada - National Science Library

    Dantagnan, Patricio; Dominguez, Astrid; Borquez, Aliro; Alcaino, Javier; Pavez, Claudio; Hernandez, Adrian

    2012-01-01

    The synergistic effect of arachidonic acid (ARA) (20:4n-6) and [alpha]-tocopherol on the accumulation of fatty acids and the peroxidation of lipids in liver and muscle was evaluated in Atlantic salmon (Salmo salar) juveniles...

  8. Effect of niobium addition to the Fe-17% Cr alloy on the resistance to generalized corrosion in sulfuric acid; Efeito da adicao de niobio a liga Fe-17% Cr sobre a resistencia a corrosao generalizada em acido sulfurico

    Energy Technology Data Exchange (ETDEWEB)

    Alonso, Neusa; Wolynec, Stephan

    1992-12-31

    The aim of present work was to investigate the influence of Nb upon the corrosion resistance to o.5 M H2 SO{sub 4} cf 17% Cr ferritic stainless steels, to which it was added in amounts larger than those necessary for the stabilization of interstitial elements. The performance of Fe-17% Cr alloys containing 0.31%, 0.58%, 1.,62% Nb was compared to that of two other Fe-17% Cr alloys containing 0.31%, 0.58% and 1.62% Nb was compared to that of two other Fe-175 Cr alloys, one without additions and another containing 0.93% Nb. Through weight and electrochemical measurements and through morphologic examination of corroded surface it was found that in o.5 M H{sub 2} SO{sub 4} solution the corrosion of these alloys, with the exception of that containing molybdenum, products in two different stages. In the first stage (up to about 60 minutes) the rate practically does not change with time, the lower rates being displayed by alloys containing larger mounts of Nb. In the second stage (for immersion times larger than 60 minutes) the corrosion rate increases with time. the corrosion rate of Mo containing alloy is constant with time so that for longer immersion times this alloy becomes the most resistant. The first stage was discussed in terms of electromechanical properties of Nb and its ability to combine with steel impurities, while the second stage was considered as affected by corrosion products formed on the surface of these alloys after certain time of immersion. (author) 24 refs., 1 fig., 3 tabs.

  9. Characterization of commercial ceramic adsorbents and their application on naphthenic acids removal of petroleum distillates; Caracterizacao de adsorventes ceramicos comerciais e sua aplicacao na remocao de acidos naftenicos de destilados de petroleo

    Energy Technology Data Exchange (ETDEWEB)

    Silva, J.P.; Senna, L.F. de; Lago, D.C.B. do; Silva Junior, P.F. da; Figueiredo, M.A.G. de; Dias, E.G. [Universidade do Estado do Rio de Janeiro (UERJ), RJ (Brazil)], e-mail: julia_psi@yahoo.com.br; Chiaro, S.S.X. [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil). Centro de Pesquisas (CENPES)

    2006-07-01

    One denominates 'naphthenic acids' to the mixture of carboxylic acids that is present in petroleum oil, and is directly responsible for its acidity and corrosiveness in liquid phase during the refine process. These acids are also presents in distilled fraction of petroleum, causing several problems in final products quality. A possible way to remove them from petroleum distilled fractions is the adsorption in porous materials. However, the published results indicate that ion exchange resins would be the best adsorbents for this process, which would probably increase its cost. In this work, two commercial adsorbents (clay and activated alumina) were characterized by a set of physical-chemistry techniques and evaluated concerning their capacity of removing naphthenic acids from a light petroleum fraction. It was also verified the influence of a previous thermal treatment to the adsorption in their physical-chemistry characteristics and its properties. (author)

  10. 铌-酒石酸-邻硝基苯基萤光酮-CTMAB 多元络合物显色反应的研究%Colour Reaction of Multicomponent Complex Niobium-Tartaric Acido-Nitrophenylfluorone-CTMAB

    Institute of Scientific and Technical Information of China (English)

    沈含熙; 王连生

    1984-01-01

    @@铌的高灵敏显色反应,迄今报道甚少。以邻硝基苯基萤光酮为显色剂的氯仿萃取光度法[1],虽然具有较高的灵敏度(8=1.38×105),但由于使用有机溶剂进行萃取操作而感不便。我们考虑以胶束增敏反应在水溶液中进行铌的测定来代替萃取光度法,可能使实验操作简化。 试验结果表明,在酒石酸-盐酸介质中,铌(Ⅱ) 可以与邻硝基苯基萤光酮以及阳离子表面活性剂CTMAB形成具有四元组分的络合物,其最大吸收峰位于525nm,相应的摩尔吸光系数可达到1.63×105升·摩尔-1·厘米-1。有可能发展成为水相介质中测定微量铌的高灵敏分光光度法。

  11. Impact of acid mine drainage from mining exploitations on the Margajita River basin and the Hatillo reservoir (Dominican Republic); Impacto del drenaje acido de explotaciones mineras en la cuenca del Rio Margajita y Embalse de Hatillo (Republica Dominicana)

    Energy Technology Data Exchange (ETDEWEB)

    Grandia, F.; Salas, J.; Arcos, D.; Archambault, A.; Cottard, F.

    2009-07-01

    Mining of the Pueblo Viejo high-sulphidation epithermal deposit (Dominican Republic) leads to environmental impact due to the formation of acid mine drainage associated with the oxidative dissolution of sulphides and sulpho salts. In addition to the very low pH, the acid waters are capable of transporting away from the mining areas high concentrations of metals and metalloids in solution. In the present work, a geochemical study of sediments deposited in the Hatillo reservoir is carried out. This reservoir is fed by the Margajita and Yuna streams which transport leachates from the Pueblo Viejo and Falcondo-Bonao (Cr-Ni) mining areas, respectively. The results show that these sediments have very high concentrations of Fe, Al and sulphate, along with significant amounts of As, Zn and Te, which are of especial environmental concern. The main contributor to this metal discharge into the reservoir is the Margajita stream, whereas the Yuna stream does not transport significant amounts of metals in solution due to its neutral pH, although it is likely that metals such as Mn, Cr, Ni and Co can be mobilised as a particulate. (Author) 5 refs.

  12. Modificacion del Valor Nutrimental de Acidos Grasos en Semilla de la Halofita Salicornia bigelovii Torr. con la Interaccion de Bacterias Promotoras del Crecimiento de Plantas (Azospirillum halopraeferens y Klebsiella pneumoniae)

    OpenAIRE

    Edgar Omar Rueda Puente; Enrique Troyo Dieguez; Thelma Castellanos Cervantes; Bernardo Murillo-Amador; Bertha Olivia Arredondo Vega; Jose Luis Díaz de Leon Alvarez; Mario Antonio Tarazon Herrera

    2005-01-01

    Una especie vegetal a gran escala se presenta como una alternativa para la producción de ácidos grasos esenciales en nutrición humana por lo que su composición de ácidos grasos cobra especial importancia. Salicornia bigelovii una halófita que se desarrolla en ambientes áridos y costeros como las del estado de Sonora y de la península de Baja California Sur, México, presenta ser una especie alternativa en la producción de aceites comestibles. La fijación de N2 por bacterias asociadas con raíce...

  13. Obtention and characterization of acrylic acid-i-polyethylene organometallic copolymers with Mo, Fe, Co, Zn, and Ni; Obtencion y caracterizacion de copolimeros organometalicos de acido acrilico-i-polietileno, con Mo, Fe, Co, Zn y Ni

    Energy Technology Data Exchange (ETDEWEB)

    Dorantes, G.; Urena, F.; Lopez, R. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico); Lopez, R. [Universidad Autonoma del Estado de Mexico (Mexico)

    1997-07-01

    In this study a graft acrylic acid (AA) in low density polyethylene (PEBD) copolymers were prepared, using as reaction initiator, gamma radiation at different doses. These copolymers were coordinated with molybdenum, cobalt, iron, zinc and nickel. the obtained polymeric materials were characterized by conventional analysis techniques. It was studied the measurement parameter variation of the positron annihilation when they inter activated with this type of materials and so obtaining information about microstructure of these polymers. (Author)

  14. Bioethanol production by cashew apple bagasse (Anacardium occidentale L.): comparison of acid diluted and alkali pre-treatments; Producao de bioetanol a partir da fibra do caju (Anacardium occidentale L.): comparacao entre o pre-tratamento acido e alcalino

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigues, Tigressa H.S.; Pinheiro, Alvaro D.T.; Goncalves, Luciana R.B. [Universidade Federal do Ceara (UFC), Fortaleza, CE (Brazil); Rocha, Maria V.P.; Macedo, Gorete R. de [Universidade Federal do Rio Grande do Norte (UFRN), Natal, RN (Brazil)

    2008-07-01

    Due to the growing environmental awareness on the negative impact resulting from utilization of fossil fuels, and in the search for renewable energy sources, biofuels' interest as Bioethanol has rapidly expanded recently. In this context, lignocellulosic compounds have become center of attention as an abundant and economic alternative source of carbohydrates for ethanol production. In this study, cashew's bagasse acid hydrolysis was initially studied for glucose synthesis and its fermentation towards ethanol production. Sulfuric acid concentration, solids concentration and time were some of the factors evaluated. The highest glucose productivity value (162,9 mg.g de bagaco{sup -1}) , was obtained for 0,6 mol.L{sup -1} of sulfuric acid in an autoclave at 121 deg C for 15 min. For the fermentation of the hydrolyzed material by S. cerevisiae containing 16 {+-} 2,0 g.L{sup -1} of glucose metabolic, the yield and productivity obtained were 0,63 g-g glucose{sup -1} and 1,43 g.L{sup -1}h{sup -1} respectively. Ethanol concentration after 6 h of fermentation of this hydrolyzed was 11 g.L{sup -1}. In the best conditions of acid hydrolysis, a second pre-treatment with diluted sulfuric acid was performed to evaluate availability of hemicelluloses at 160 deg C and 180 deg C. For comparative purposes, alkali pre-treatment was evaluated under the conditions of 0,6 mol.L{sup -1}, 30% p/v of bagasse thermically treated at 121 deg C for 15 minutes. However, concentration of sugars was not sufficient for fermentation. Also, nitrogen supplementation of the hydrolyzed fraction did not influence significantly ethanol production. The results demonstrate that the hydrolyzed fraction from the acid pre-treatment of cashew's bagasse could be utilized for ethanol production. (author)

  15. Un nuevo Método para Mejorar el Proceso de Producción de Acido Bórico A New Method to Improve the Production Process of Boric Acid

    OpenAIRE

    Orlando J Domínguez; Emilio M Serrano; Jorge E Flores; Raquel L Michel

    2011-01-01

    En este trabajo se propone una modificación al proceso tradicional para obtener ácido bórico, con el agregado fraccionado del ácido lixiviante, para lograr un producto altamente soluble, como el pentaborato de sodio. Con esto se consigue la disolución del mineral en frío con menor cantidad de reactivo lixiviante, ahorrando así energía. Al líquido clarificado se le disminuye el pH logrando así la precipitación del ácido bórico. La ganga se agota con diferentes etapas de precipitación y filtrac...

  16. Effect of organoclays content and modify the impact on mechanical properties of of bionanocomposites poly (lactic acid ) - PLA; Efeito do teor de argilas organofilicas e modificador de impacto nas propriedades mecanicas de bionanocompositos de poli (acido latico)-PLA

    Energy Technology Data Exchange (ETDEWEB)

    Cavalcanti, Shirley N.; Alves, Amanda M.; Agrawal, Pankaj; Silva, Moacy P. da; Araujo, Aylanna P.M.; Araujo, Edcleide M.; Melo, Tomas J.A., E-mail: shirleynobre@gmail.com [Universidade Federal de Campina Grande (UFCG), Campina Grande, PB (Brazil). Departamento de Engenharia de Materiais

    2013-07-01

    Until recently, it has become important to develop more durable plastic materials to meet the needs of the market, which have wide range of applications. But these materials are from non-renewable sources cause environmental impact due to the large amount of waste they produce. In order to evaluate the effect of organoclay (Brasgel PA and vermiculite) and impact modifier (EMA-GMA) were developed PLA bionanocomposites / Clays through the merge process by melting and rated the content (1, 3 and 5pcr) the mechanical properties of these clays. The clays were organophilizated using a percentage of surfactant based on the capacity of cation exchange. The bionanocomposites were prepared by extrusion followed the injection molding step of the specimens. The clays were characterized by X-ray diffraction (XRD).The bionanocomposites were characterized by the mechanical properties of impact and traction. The techniques of X-ray diffraction showed that organophilization process used was efficient. The mechanical properties were changed, and the impact strength showed considerable gain when the PLA was blended with the copolymer and the organoclay. (author)

  17. Shyntesis and cytotoxicity evaluation in vitro of new compounds with hybrid structures of 8-flavoneacetic acid and quinolones; Sintesis y evaluacion citotoxica in vitro de nuevos compuestos con estructuras hibridas del acido 8-flavonacetico quinolonas

    Energy Technology Data Exchange (ETDEWEB)

    Biaa, M.F.; Castellano, J.M.; Emling, F.; Schlick, E. [Knoll, S.a., Madrid (Spain)

    1994-12-31

    Using the structural similarity between 8-flavoneacetic acid the antitumor quinolones, we have prepared some hybrid compounds on both systems and studied their cytotoxicity. None of the sinthesized compounds have shown sufficient interest for further development. 33 refs.

  18. Adição de IN3 a derivados de acidos -alquil cinamicos : obtenç2o de 2-alquil-3-fenil-1-azirinas e 3-azido-2-azetidinonas

    OpenAIRE

    Cintia Maria Rubo de Souza Nobre

    1987-01-01

    Resumo: O presente trabalho iniciou-se com a preparação da 2- fenil-3-carbometoxi-1-azirina (16) onde se pretendia o estudo da reatividade dos dois centros eletrófilos existentes no carbono da ligação imino e na carbonila do éster. . Reação entre o sistema 16 com hidrazina em benzeno, conduz a o 4-aminopirazol-3-ona (26) interceptado primeiramente com a adição ao meio reacional, de benzaldeído e depois acetil acetona através da obtenção respectivamente, da base de Schiff 37 e enaminona 38 cor...

  19. Labelling of 5-ethyl-5-phenylbarbituric acid with Technetium-99m: biodistribution study in Swiss mice; Marcacao do acido 5-etil-5-fenilbarbiturico com tecnecio-99m: estudo da biodistribuicao em camundongos Swiss

    Energy Technology Data Exchange (ETDEWEB)

    Simoes, Susana B.E.; Oliveira, Marcia B.N. de; Gutfilen, Bianca; Bernardo-Filho, Mario [Universidade do Estado, Rio de Janeiro, RJ (Brazil). Inst. de Biologia. Dept. de Biofisica e Biometria; Alves, Andreia Coelho; Machado-Silva, Jose R. [Universidade do Estado, Rio de Janeiro, RJ (Brazil). Inst. de Biologia. Dept. de Parasitologia

    1996-07-01

    The 5-ethyl-5-phenylbarbituric acid (phenobarbital) is used as a sedative, hypnotic and anticonvulsant drug. We decided to label it with technetium-99m. In order to determine the optimal conditions, different concentrations of this drug were incubated with various stannous chloride solutions. Then, {sup 99m}Tc was added and chromatography was performed using 0.9% NaCl solution, acetone and n-butyl alcohol as the mobile phase. Using a solution of 0.01 mg/ml stannous chloride and 1.0 mg/ml phenobarbital over 92% of the radioactivity bound to phenobarbital {sup 99m}Tc-phenobarbital. In the biodistribution study, {sup 99m}Tc-phenobarbital was administered in mice intraperitoneal. The main uptake of the labeled drug was in the liver, blood, kidneys, spleen and stomach. The phenobarbital is also used as anesthetic drug in animals. Earlier studies confirm that this drug can dislocate the adult worms of Schistosoma mansoni to mesenteric vein towards the liver and portal vein, so that we used infected animals, radioactivity was not found in isolated worms and we can conclude that the phenobarbital has an indirect action in relation to the displacement of the worms. (author)

  20. Influence of several non ferrous metals in the treatment of residual liquors from sulfuric acid picking processes. Influencia de diversos metales no ferreos en el tratamiento de lejias residuales de decapado con acido sulfurico

    Energy Technology Data Exchange (ETDEWEB)

    Negro, C.; Gonzalez, A.; Latorre, R.; Dufour, J.; Formoso, A.; Lopez-Mateos, F. (Departamento de Ingenieria Quimica. Facultad de Ciencias Quimicas, Universidad Complutense, Madrid (Spain))

    1994-01-01

    In the oxiprecipitation of waste liquors from sulfuric picking processes several kinds of ferrous oxides and oxihydroxides are obtained which can be used like raw materials for the chemical industry. Generally, in this process different mixtures of then are obtained and only in the most drastic conditions, pure products can be obtained. The presence of non-ferrous metals catalyzes and modifies the mechanism of the reaction, yielding pure products. The aim of this work is to determine the influence of Cu(II), Al(III), Zn(II) and Mo(VI) on the oxiprecipitation of residual liquors from sulfuric acid picking processes, selecting the most favorable operation conditions at which it is possible to obtain products for industrial applications. (Author) 20 refs.

  1. Avaliação histometrica da regeneração periodontal obtida com o uso de membranas reabsorviveis de acido polilactico em defeitos periodontais em cães

    OpenAIRE

    Enilson Antonio Sallum

    1996-01-01

    Resumo: O objetivo deste estudo foi avaliar o uso das membranas reabsorvíveis (GUIDOR `MARCA REGISTRADA´) no tratamento de defeitos periodontais em cães, utilizando análise histométrica, comparando com o uso da terapia convencional. Deiscências ósseas vestibulares (3x5mm) foram criadas nas raízes distais dos terceiros pré-molares mandibulares (P3) em 5 cães e uma tira matriz metálica tipo Toffelmire foi fixada na área. Três meses após a fabricação do defeito, as bandas metálicas foram removid...

  2. Effect of the humic acids in the adsorption of U (Vi) in a Mexican natural zeolite; Efecto de los acidos humicos en la adsorcion de U (VI) en una zeolita natural mexicana

    Energy Technology Data Exchange (ETDEWEB)

    Sandoval G, H. A.; Lopez del R, H.; Davila R, J. I.; Mireles G, F., E-mail: hlopezdelrio@hotmail.com [Universidad Autonoma de Zacatecas, Unidad Academica de Estudios Nucleares, Cipres No. 10, Fracc. La Penuela, 98068 Zacatecas (Mexico)

    2012-10-15

    The uranium adsorption was studied in a Mexican natural zeolite of the clinoptilolite type in presence and absence of humic acids (Ha). The adsorption kinetics of the binary U-zeolite and ternary U-Ha-zeolite systems were compared, and the effect of the humic matter impregnated in the zeolite in the uranium removal in function of the solution ph was studied. The experiments were made to environmental conditions and lightly acid ph, with fixed concentrations of uranium and Ha of 1 x 10{sup -5} M and 20 ppm, respectively, and a reason m/V of 5 mg/ml. The uranium adsorption in absence of Ha was of 96% and decreased to 45% in the ternary system U-Ha-zeolite. The data of the binary system U-zeolite were analyzed with three kinetic models of adsorption (pseudo-first order, pseudo-second order and Elovich). By means of non lineal regression was found that the uranium adsorption obeys a kinetic of pseudo-second order. It was observed that the uranium adsorption in the zeolite impregnated with Ha is favored to more ph at 5. (Author)

  3. COMPOSICIÓN MOLECULAR DE ACIDOS HUMICOS EVALUADA MEDIANTE PIRÓLISIS -CROMATOGRAFIA DE GASES- MASAS E HIDRÓLISIS TÉRMICA ASISTIDA Y METILACIÓN, EN SUELOS ALTOANDINOS – COLOMBIA

    Directory of Open Access Journals (Sweden)

    Claudia Martinez

    2014-07-01

    Full Text Available Se determinó la composición  molecular de ácidos húmicos (AH, extraídos del horizonte A de suelos altoandinos, Colombia dedicados a tres usos: bosque primario, cultivo y pastura. Los AH se obtuvieron mediante extracción secuencial de la materia orgánica humificada (MOH con soluciones de tetraborato, pirofosfato e hidróxido de sodio (0,1N, y fueron purificados por diferentes procesos analíticos. Su composición molecular se determinó  por Py-GC/MS y THMA. Los diferentes productos de la pirolisis se clasificaron atendiendo a la familia química a la que pertenecen,  prevalecieron los ácidos grasos (FA como el producto más abundante en los AH de todos los usos, mientras que  los fenoles, esteroles, S-compuestos y terpenos se encontraron en menor abundancia. Se presentaron diferencias en los porcentajes de abundancia relativa de los grupos identificados, demostrando que el cambio de uso de suelo influye en las propiedades físicas, químicas y biológicas del suelo por lo que se perciben diferentes grados de transformación, que afectan la composición de los AH y su reactividad en el suelo.

  4. Evaluation of the physicochemical properties of structured materials: metallic, polymeric and ceramic, for the treatment of sour gases; Evaluacion de las propiedades fisicoquimicas de materiales estructurados: metalico, polimerico y ceramico, para el tratamiento de gases acidos

    Energy Technology Data Exchange (ETDEWEB)

    Salazar, A.; Chavez, R. H. [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico); Olea, O.; Solis, D., E-mail: rosahilda.chavez@inin.gob.mx [Universidad Autonoma del Estado de Mexico, Facultad de Quimica, Cerro de Coatepec s/n, Ciudad Universitaria, 50100 Toluca, Estado de Mexico (Mexico)

    2013-07-01

    in this work the physicochemical properties of three structured materials: metallic, polymeric and ceramic, from Sulzer Brothers Limited brand, are studied in order to removal sour gases, by absorption process, in aqueous solution of Monoethanolamine (Mea), at 30% weight. Mechanical properties, chemical composition, morphology and corrosion resistance were determined, using different characterization techniques, such as: 1) mechanically, according to standard procedures Astm E-384-1990, 2) chemically, by the corrosion resistance in the presence of an electrochemical cell, in aqueous solution of H{sub 2}SO{sub 4}, 1 N by Astm G-5-1999, 3) morphologically by scanning electron microscopy technique, and 4) efficiency of separation, by the gas chromatography technique in order to determine the chemical absorption of CO{sub 2} by Mea. The ceramic material was the hardest with 700 Hk value and tensile strength of 90 MPa, likewise showed resistance to corrosion of 10.28 m py, separation efficiency of 74% CO{sub 2}, at 10 minutes. The metallic material had a hardness of 190 Hk and it was the most resistant of tension, with 831 MPa, and corrosion resistance of 780.4 x 10{sup -6} m py, likewise promoted CO{sub 2} separation efficiency of 90% during the evaluation. The polymeric material presented hardness of 20 Hk and 35 MPa and it was not suffered surface change with electrochemical attack, with 282.4 x 10{sup -6} m py, and separation efficiency of 88%. Therefore the polymer was the most ductile, with smooth surface and greater resistance with H{sub 2}SO{sub 4}. The metal material was more resistant to plastic deformation and more corrugated surface and the second resistance in the presence of acid medium in aqueous solutions. For all the above, the metallic material is recommended by its greater separation in the reduction of acid gases and the polymer due to its greater chemical resistance. (Author)

  5. Composição química e perfil de ácidos graxos do leite e muçarela de búfalas alimentadas com diferentes fontes de lipídeos Chemical composition and fatty acids profile in milk and mozzarella cheese of water buffalo fed different lipid sources

    Directory of Open Access Journals (Sweden)

    R.L. Oliveira

    2009-06-01

    Full Text Available Avaliaram-se a composição química e o perfil de ácidos na gordura do leite de búfalas alimentadas com fontes de lipídeos. Foram utilizadas nove búfalas em lactação, multíparas e com produção média diária de leite de 6,5kg. O delineamento experimental foi quadrado latino 3x3, triplo, composto por três tratamentos, três períodos de 21 dias e nove repetições. Os tratamentos foram dietas sem lipídeo adicional, com grão de soja e com óleo de soja. A proporção de silagem de milho variou entre 70 e 75%. A inclusão de óleo de soja elevou os teores de gordura no leite e no queijo tipo muçarela. As concentrações de ácidos graxos saturados (AGS variaram de 62,8 a 69,8%. Não houve diferenças nos teores de AGS entre os tratamentos sem lipídeo adicional e com grão de soja. O tratamento com óleo de soja resultou em queda de 10% no teor de AGS. As fontes lipídicas reduziram as concentrações de AGS e aumentaram as concentrações de ácidos graxos insaturados. Ácidos graxos encontrados na muçarela, em ordem decrescente, foram: palmítico, oleico, láurico e esteárico. O óleo de soja apresentou maior capacidade de elevar as concentrações do ácido linoleico conjugado (CLA e do ácido vaccênico no leite e no queijo muçarela.The chemical composition of milk and fatty acids profile in milk fat of water buffaloes fed different lipid sources were evaluated. Nine lactating multiparous water buffaloes, averaging 6.5kg of milk daily, were used. The statistical design was 3x3 triple Latin Square, three periods of 21 days and nine repetitions. The treatments were diet without additional fat, diet with soybean grain, and diet with soybean oil. Corn silage content in the diets ranged from 70 to 75%. The inclusion of soybean oil increased fat content in milk and mozzarella. Saturated fatty acid (SFA concentrations in milk ranged from 62.8 to 69.8%. SFA content was similar in milk for the diets without additional fat and with

  6. Antioxidant activity of 100% and 80% methanol extracts from barley seeds (Hordeum vulgare L.: stabilization of sunflower oil

    Directory of Open Access Journals (Sweden)

    Iqbal, Shahid

    2010-09-01

    Full Text Available The antioxidant potential of 100% and 80% methanol extracts from the seeds of three barley varieties (Jou 83, Jou 87 and Haider 93 was assessed. The extract yields from barley seeds ranged from 3.23% (Haider 93,100% methanol to 5.31% (Jou 83, 80% methanol. The total phenolic contents, DPPH radical scavenging activity (IC50 values and inhibition of linoleic acid oxidation of barley seed extracts (BSE were determined to be 88.1-145.7 mg/100g, 90.8-168.6 μg/mL and 62.6-74.6%, respectively. The antioxidant effectiveness of BSE was also assessed by stabilizing sunflower oil (SFO with BSE at a concentration of 600 ppm (oil weight basis. The stabilized (treated with extract and the control (without extract addition SFO samples were subjected to accelerated (oven heating at 60ºC for 30 days, 8 h heating cycle/day storage. These were analyzed at regular intervals for the extent of oxidative changes according to the measurements of their contents of peroxide value, para-anisidine value, conjugated dienes and conjugated trienes. Generally, the 80% methanol extract of barely seeds demonstrated better antioxidant action than the 100% methanol extract. The antioxidant activity of BSE was also found to be considerably varied among the varieties tested. The present results suggest that antioxidant extracts from barely seeds might be used to protect vegetable oils from oxidation.El potencial antioxidante de extractos de metanol al 100% y el 80% de semillas de tres variedades de cebada (Jou 83, Jou 87 y Haider 93 fue evaluada. El rendimiento de los extractos de las semillas de cebada vario desde un 3.23% (Haider, 100% methanol a un 5.31% (Jou 83, 80% metanol. El contenido total de fenoles, la actividad atrapadora del radical DPPH (valores IC50 y la inhibición de la oxidación del ácido linoleico de los extractos de semilla de cebada (BSE fueron 88.1-145.7 mg/100g, 90.8-168.6 μg/mL y 62.6- 74.6%, respectivamente. La efectividad antioxidante de BSE fue tambi

  7. Characteristics and fatty acid composition of milk fat from Saudi Aradi goat

    Directory of Open Access Journals (Sweden)

    Sbihi, H. M.

    2015-12-01

    ,2 mg de KOH·g−1 de grasa; índice de refracción a 25 °C: 1.4583; insaponificable: 0,54%; acidez: 0,52%; y el índice de peróxidos, 2,07 meq O2·kg−1 de grasa. α-tocoferol fue el principal tocol (70,9%, seguido de β- tocoferol (22,02%. La GLC tiene un contenido significativo de ácidos grasos poliinsaturados (FA (6,16%, ácido linoleico conjugado (0,36%, ácidos grasos saturados (67,04% y ácidos grasos ramificados (1,98%. Los perfiles térmicos de las muestras de GLC de Arabia Aradi fueron examinados utilizando análisis térmico gravimétrico (ATG y calorimetría diferencial de barrido (CDB. La GLC de Arabia Aradi mostró cierta absorbancia en el rango UV-C. Este estudio demostró que la grasa de la leche de la cabra de Arabia tiene propiedades física y químicamente favorables, así como buenas propiedades nutricionales, como fuente de ácidos grasos esenciales y vitamina E liposoluble.

  8. Encapsulated specialty oils commercialized in São Paulo state, Brazil: evaluation of identity (fatty acid profile and compliance of fatty acids and Vitamin E contents with nutrition labeling Óleos especiais encapsulados comercializados no estado de São Paulo, Brasil: avaliação da identidade (perfil de ácidos graxos e da adequação do conteúdo de ácidos graxos e vitamina E da informação nutricional

    Directory of Open Access Journals (Sweden)

    Karen Hirashima

    2013-03-01

    ártamo, 3 de linhaça e uma de prímula. Entre as adulteradas, 3 de linhaça e 2 de cártamo tinham, provavelmente, adição de óleo de soja. Ácido linoleico conjugado (CLA foi encontrado em duas amostras denominadas de óleo de cártamo, apesar da Agência Nacional de Vigilância Sanitária (ANVISA não autorizar a venda de óleos contendo CLA no Brasil. Somente duas amostras apresentaram todos os componentes analisados de acordo com o declarado na rotulagem (uma de óleo de linhaça e outra de borage. Os resultados indicam a necessidade de um monitoramento contínuo dos óleos especiais encapsulados comercializados no Brasil, incluindo um número maior de amostras e em conjunto com a vigilância sanitária.

  9. Desarrollo y caracterización de un conjugado del péptido análogo a glucagón (GLP-1) a nanopartículas de oro, como nueva forma de entrega de biomoléculas con potencial aplicación en diabetes

    OpenAIRE

    PÉREZ ORTIZ, MARÍA MAGDALENA

    2014-01-01

    Generalmente el potencial terapéutico de péptidos y proteínas se ve dificultado por sus características físico-químicas, las cuales impiden su entrega de manera exitosa. En este sentido, la incretina GLP-1 es un péptido que posee gran utilidad terapéutica, debido a sus interesantes acciones sobre el metabolismo de la glucosa, por lo que actualmente es un excelente candidato para el tratamiento de la Diabetes Mellitus tipo 2. Sin embargo, como macromolécula de tipo peptídico,...

  10. Ácido linoléico conjugado (CLA em dietas para tilápia-do-nilo: desempenho produtivo, composição química e perfil de ácidos graxos Conjugated linoleic acid (CLA in Nile tilapia diets: productive performance, chemical and fatty acids composition

    Directory of Open Access Journals (Sweden)

    Lilian Dena dos Santos

    2007-10-01

    Full Text Available Objetivou-se avaliar a influência da adição de CLA na dieta sobre o desempenho produtivo, a composição química e o perfil de ácidos graxos de tilápia-do-nilo. Foram utilizados 80 peixes revertidos, com 109 ± 10 g, distribuídos em oito tanques (0,8 m³ cada, em densidade de 10 peixes/tanque, durante 90 dias. Avaliou-se a inclusão na dieta de 2% de CLA (Luta-CLA®-BASF, Brasil com 60% dos isômeros (cis-9,trans-11 e trans-10,cis-12 e 40% do veículo (ácido oléico e outros ácidos graxos. Como dieta utilizou-se ração comercial extrusada, com 29% PB e 3.000 kcal ED/kg de ração. Ao final do experimento, todos os peixes foram utilizados para avaliação do desempenho, da composição química e do perfil de ácidos graxos no fígado e nos filés. A taxa de eficiência protéica, o rendimento de carcaça, o índice hepatossomático e a gordura visceral não diferiram com a adição de CLA a dieta. A adição de CLA a dieta promoveu melhora no ganho de peso, aumento no consumo e melhora na conversão alimentar. Os peixes alimentados com dietas com adição de CLA apresentaram aumento na composição de ácidos graxos saturados e redução dos ácidos graxos n-6 nos filés. Houve também aumento na composição de ácidos graxos n-3 e de ácidos graxos poliinsaturados totais no fígado. Houve aumento da proteína nos filés de tilápias alimentadas com dietas enriquecidas com CLA. O uso do CLA melhora variáveis de desempenho produtivo, afeta o metabolismo e a proporção dos ácidos graxos nos filés e fígados e aumenta proteína nos filés em tilápia-do-nilo.The objective of this work was to evaluate the influence of the addition of CLA in the diet on Nile tilapia productive performance, chemical and fatty acids composition. Eighty reversed fish with 109 ± 10 g were used, distributed in eight tanks (0.8 m³ each in density of ten fishes/tank, during 90 days. It was evaluated the inclusion in the diets of 2% of CLA (Luta-CLA®-BASF, Brazil with 60% of isomers (cis-9,trans-11 and trans-10,cis-12 and 40% of vehicle (oleic acid and other fatty acids. As diets, a commercial extruded ration with 29% CP and 3000 kcal DE/kg of ration was used. At the end of the experiment all fishes were used for the evaluation of performance, of chemical composition and profile of fatty acids on liver and fillets. No differences for protein efficiency ratio, carcass yield, hepatosomatic index and visceral fat, were observed with the addition of CLA in the diet. The addition of CLA in the diet improved weight gain, feed intake and feed conversion ratio. Fishes fed diets with addition of CLA showed an increase in saturated fatty acids composition, reduction in n-6 fatty acids in the fillets and increase in n-3 fatty acids and total polyunsaturated fatty acids composition in the liver. There was an increase of protein in fillets of tilapia fed with rations enriched with CLA. CLA utilization improve productive performance, affect the fatty acids metabolism and pattern in fillets and liver and increase the body protein of Nile tilapia.

  11. Nonlinear analysis of thermal stresses of a of first stage nozzle of a gas turbine at full load from the results of an analysis of conjugated heat transference; Analisis no lineal de esfuerzos termicos de una tobera de primera etapa de turbina de gas a plena carga a partir de resultados de un analisis de transferencia de calor conjugado

    Energy Technology Data Exchange (ETDEWEB)

    Perez Hernandez, Efrain [Centro Nacional de Investigacion y Desarrollo Tecnologico (Cenidet), Cuernavaca, Morelos (Mexico); Mazur C, Zdzislaw; Garcia Illescas, R; Hernandez Rossette, Alejandro [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2007-11-15

    The gas turbines operate at extremely high temperatures, at high thermal and mechanical stresses, causing that the useful life of the involved components be reduced. In the present article the results realized by previous investigations of temperatures obtained from analysis of heat transfer and flow of fluids of the nozzle by means of the Star-CD program based on finite volumes is presented. Later, the NISA program of finite elements was used to realize the analysis of thermal stresses considering the material plasticity. The methodology employed to determine the material properties variable with the temperature of the super-alloy FSX-414 and the plasticity model used in the structural analysis in the finite element program. The result will be later used in the fatigue analysis for the useful life assessment. [Spanish] Las turbinas de gas operan a temperatura extremadamente altas, a elevados esfuerzos termicos y mecanicos, ocasionando que la vida de los componentes involucrados se reduzca. En el presente articulo se presentan los resultados realizados por previas investigaciones de temperaturas obtenidas a partir de analisis de transferencia de calor y flujo de fluidos de la tobera mediante el programa Star-CD basado en volumenes finitos. Posteriormente, se utilizo el programa NISA de elementos finitos para realizar el analisis de esfuerzos termicos considerando plasticidad del material. Se muestra la metodologia empleada para determinar las propiedades del material variables con la temperatura de la superaleacion FSX-414 y el modelo de plasticidad utilizado en el analisis estructural en el programa de elemento finito. Los resultados seran empleados posteriormente en el analisis de fatiga para la estimacion de vida util.

  12. Bioquímica: pH and Equilibrios ácido – base, 2010-11

    OpenAIRE

    González-Núñez, Verónica

    2010-01-01

    I. Materiales de clase: 1. Introducción. Conceptos previos; 2. Curvas de titulación de ácidos and bases; 3. Aminoácidos. Propiedades ácido – base; 4. Curvas de titulación de aminoácidos; 5. Problemas sobre equilibrios acido - base and aminoácidos; 6. Mantenimiento del pH en el medio extracelular; 7. Estudio del equilibrio acido-base de un paciente; 8. Casos prácticos de alteraciones del equilibrio acido-base. II. Bibliografía. III. Materiales complementarios El objetivo general de esta asi...

  13. Phosphategypsum wastes in Venice lagoon. Radiological impact; Le discariche di fosfogessi nella laguna di Venezia. Valutazioni preliminari dell'impatto radiologico

    Energy Technology Data Exchange (ETDEWEB)

    Belli, M; Blasi, M; Guogang, J.; Rosamilia, S.; Sansone, U. [Agenzia Nazionale per la Protezione dell' Ambiente, Rome (Italy); Biancotto, R.; Bidoli, P.; Sepulcri, D. [Agenzia Regionale di Prevenzione e Protezione del Veneto, Venice (Italy). Dipt. provinciale di Venezia; Cavolo, F. [Smilax, Mira, VE (Italy)

    2000-07-01

    The phosphoric minerals utilized in phosphoric acid production, presents high concentrations of radioactive materials: U238, Th 232, K 40. The phosphogypsum is the waste material obtained in the phosphoric acid production in wet process. This type of production method is employed for many years in Venice lagoon (Porto Marghera chemical plants). In this paper are reported evaluations of radiological impact on aquatic environment of lagoon. [Italian] Con il termine di fosfogessi si intende comunemente il materiale di risulta che si ottiene nella produzione di acido fosforico attraverso la via umida (attacco acido). Questa tipologia di produzione che ha operato per diversi decenni a Porto Marghera, e' finalizzata allo scopo di ottenere acido fosforico principalmente per l'industria dei fertilizzanti e quindi come prodotto intermedio per la chimica e per le preparazioni alimentari. Il fosforo, elemento principale della reazione, era ricavato da rocce fosfatiche di origine sedimentaria marina provenienti per lo piu' dall'Africa settentrionale. Il sistema produttivo utilizzato negli impianti di Porto Marghera era basato su una reazione principale, che partendo dal minerale attraverso un attacco acido, produceva acido fosforico: Ca{sub 3}(PO{sub 4}){sub 2} (Minerale Fosforico) + 3H{sub 2}SO{sub 4} (Acido Solforico) + 3H{sub 2}O (Acqua) {yields} 2H{sub 3}PO{sub 4} (Acido fosforico) + 3CaSO{sub 4}H{sub 2}O (Solfato di calcio (gesso)). In particolare il minerale era preventivamente macinato e vagliato, quindi si procedeva alla sua miscelazione con l'acido fosforico ed alla successiva reazione del composto ottenuto.

  14. FOOD SAFETY AND QUALITY IN DEVELOPING COUNTRIES: THE ROLE OF LACTIC ACID BACTERIA

    OpenAIRE

    ANGRI, MATTEO

    2016-01-01

    La sicurezza e la qualità degli alimenti sono tutt’ora un problema critico per i paesi in via di sviluppo. Le diete a basso contenuto di acido folico, per esempio, possono causare gravi problemi di salute, soprattutto nei bambini. Gravi disturbi legati al tubo neurale (DTN) nei neonati possono derivare infatti da madri che hanno insufficiente apporto di acido folico (400-600 g / giorno) durante il periodo di gravidanza. Inoltre, se non adeguatamente protetti o trattati, I prodotti alimentari ...

  15. Derivados funcionalizados e inmunorreactivos para el fungicida fludioxonil

    OpenAIRE

    Mercader Badia, Josep Vicent; Esteve Turrillas, Francesc Albert; Abad Fuentes, Antonio; Abad Somovilla, Antonio; Agulló, Consuelo

    2012-01-01

    [ES] La presente invención se refiere a haptenos, conjugados, derivados marcados y anticuerpos para fludioxonil. Así mismo, la presente invención también se refiere al uso de conjugados de fludioxonil como antígenos de ensayo o inmunógenos para obtener anticuerpos de este fungicida; y al uso de los derivados marcados de fludioxonil como antígenos de ensayo. Además, la presente invención también se refiere a un método de análisis de fludioxonil utilizando los anticuerpos obtenidos, en ocasione...

  16. Innovation in sodium erythorbate production. The use of membrane-reactors

    Energy Technology Data Exchange (ETDEWEB)

    Spigno, G. [Piacenza Univ. Cattolica del S. Cuore, Piacenza (Italy). Ist. di Enologia e Ingegneria Alimentare

    2001-04-01

    Isoascorbic or erythorbic acid is a stereoisomer of ascorbic acid acting as a preservative against oxidation and decoloration, recently approved for food use also in the European Market. Actually erythorbate is produced by means of a complex and long process after bio-fermentation of dextrose. In order to simplify and improve this process a membrane system was conceived able to induce acid 2-ketogluconic diffusion from fermentation broth directly into methanol where it esterficates. Acid 2-ketogluconic methyl ester is the intermediate for erythorbic acid. The principal problem was to perfectly separate water methanol to avoid saponification instead of esterification. [Italian] L'acido eritorbico o isoascorbico, recentemente approvato per uso alimentare anche in Europa, e' uno stereoisomero dell'acido ascorbico e agisce come antiossidante e preservante del colore. Attualmente viene prodotto con un complicato processo dopo fermentazione del destrosio. Per semplificare e migliorare questo processo, e' stato studiato un sistema a membrane in grado di trasferire direttamente l'acido 2-chetogluconico dal brodo di fermentazione al metanolo, dove esterifica. L'estere metilico dell'acido 2-chetogluconico e' l'intermedio dell'acido eritorbico. Il problema maggiore era quello di mantenere separati l'acqua ed il metanolo, per evitare la saponificazione al posto della esterificazione.

  17. Chemical recycling of post-consumer PET: structural characterization of terephthalic acid and the effect of Alkaline Hydrolysis at low temperature; Reciclagem quimica do PET pos-consumo: caracterizacao estrutural do acido tereftalico e efeito da hidrolise alcalina em baixa temperatura

    Energy Technology Data Exchange (ETDEWEB)

    Fonseca, Talitha Granja; Almeida, Yeda Medeiros Bastos de; Vinhas, Gloria Maria, E-mail: gmvinhas@yahoo.com.br [Universidade Federal de Pernambuco (UFPE), Recife, PE (Brazil). Dept. de Engenharia Quimica

    2014-09-15

    Due to the environmental impact caused by PET packaging disposal, this material recycling has been thoroughly discussed and evaluated. In particular, chemical recycling enables achievement of the monomers that are used in PET resin manufacture: ethylene glycol (EG) and terephthalic acid (PTA). Therefore, studies for this process optimization are important from environmental and economic points of view. The present study investigated certain parameters that influence the depolymerization reaction of PET post-consumer via alkaline hydrolysis in order to obtain PTA. Assays were performed at 70 °C by varying the concentration of sodium hydroxide and the reaction time. The best results were obtained at 10.82 mol L{sup -1} NaOH and 9 h reaction time. Consequently, it was possible to prove this process viability, once analyses by infrared and nuclear magnetic resonance confirmed that PTA was obtained in all reactions performed. (author)

  18. Determinacion de la configuracion E-Z de los acidos Fumarico y Maleico. Un experimento orientado a incentivar el desarrollo de la investigacion cientifica en alumnos de Pregrado Determination of the E-Z fumaric and maleic acids configuration. An experiment designed to develop scientific research abilities in undergraduates students

    Directory of Open Access Journals (Sweden)

    Carlos Bustos

    2000-08-01

    Full Text Available In this work we intend to eliminate the idea that laboratory exercises seem like cookbooks. That is, exercises shall be presented as a problematic situation. Based on observation and experimentation, the students should determine the E-Z configuration of maleic and fumaric acids. The basis of this laboratory exercise is the acid-catalyzed isomerization of maleic acid to fumaric acid. Students are given the starting material, reagents and the experimental procedure. They are told that the starting material is a dicarboxylic acid containing a C=C double bond of formula C4H4O4. Students determine melting points, solubilities, acidity and chromatographic patterns for both the starting material and the product, so that a configuration of each acid can be proposed. This type of experiment yields excellent results, because the students are left to deduce that maleic acid is less stable than fumaric acid. Additionally, they conclude that maleic acid is the "Z" isomer and fumaric acid is the "E" isomer. Finally, this laboratory exercise allows the students to develop simultaneously their critical-thinking skills with the respective laboratory techniques and not to see chemistry as recipes to be followed.

  19. Use of probabilistic safety analysis for design of emergency mitigation systems in hydrogen producer plant with sulfur-iodine technology, Section II: sulfuric acid decomposition; Uso de analisis probabilistico de seguridad para el diseno de sistemas de mitigacion de emergencia en planta productora de hidrogeno con tecnologia azufre-iodo, Seccion II: descomposicion de acido sulfurico

    Energy Technology Data Exchange (ETDEWEB)

    Mendoza A, A.; Nelson E, P. F.; Francois L, J. L. [Facultad de Ingenieria, Departamento de Sistemas Energeticos, UNAM, Paseo Cuauhnahuac 8532, 62550 Jiutepec, Morelos (Mexico)], e-mail: iqalexmdz@yahoo.com.mx

    2009-10-15

    Over the last decades, the need to reduce emissions of greenhouse gases has prompted the development of technologies for the production of clean fuels through the use of primary energy resources of zero emissions, as the heat of nuclear reactors of high temperature. Within these technologies, one of the most promising is the hydrogen production by sulfur-iodine cycle coupled to a high temperature reactor initially proposed by General Atomics. By their nature and because it will be large-scale plants, the development of these technologies from its present phase to its procurement and construction, will have to incorporate emergency mitigation systems in all its parts and interconnections to prevent undesired events that could put threaten the plant integrity and the nearby area. For the particular case of sulfur-iodine thermochemical cycle, most analysis have focused on hydrogen explosions and failures in the primary cooling systems. While these events are the most catastrophic, is that there are also many other events that even taking less direct consequences, could jeopardize the plant operation, the people safety of nearby communities and carry the same economic consequences. In this study we analyzed one of these events, which is the formation of a toxic cloud prompted by uncontrolled leakage of concentrated sulfuric acid in the second section of sulfur-iodine process of General Atomics. In this section, the sulfuric acid concentration is near to 90% in conditions of high temperature and positive pressure. Under these conditions the sulfuric acid and sulfur oxides from the reactor will form a toxic cloud that the have contact with the plant personnel could cause fatalities, or to reach a town would cause suffocation, respiratory problems and eye irritation. The methodology used for this study is the supported design in probabilistic safety analysis. Mitigation systems were postulated based on the isolation of a possible leak, the neutralization of a pond of sulfuric acid and finally washing the same; later some scenarios and modifications were analyzed to determine their impact on the likelihood of failure system and provide feedback design with the information produced in the probabilistic safety analysis. (Author)

  20. Influence of method of preparation of Pt Ru/C electrocatalysts on the catalytic activity for the ethanol oxidation reaction in acidic medium; Influencia do metodo de preparacao de eletrocatalisadores PtRu/C sobre a atividade catalitica frente a reacao de oxidacao de etanol em meio acido

    Energy Technology Data Exchange (ETDEWEB)

    Gomes, Walber dos Santos; Silva, Uriel Lean Valente; Souza, Jose Pio Iudice de, E-mail: jpio@ufpa.br [Universidade Federal do Para, (UFPA), Belem, PA (Brazil). Instituto de Ciencias Exatas e Naturais. Faculdade de Quimica

    2013-09-01

    In this work the influence of variations in the borohydrate reduction method on the properties of Pt Ru/C electrocatalysts was investigated. The electrocatalysts were prepared using 1:1 ; 2:1; 5:1; 50:1 and 250:1 molar ratios of NaBH{sub 4} to metals. The reduction was also performed by dripping or by fast addition of the solution. The results showed that Pt Ru nanoparticles obtained by fast addition had the smallest crystallite sizes. It was also noted that the catalytic activity increased as the borohydrate:metal molar ratio increased. The Pt Ru/C electrocatalysts (50:1) obtained by fast addition presented the best catalytic activity for ethanol electro-oxidation. (author)

  1. Effect of support on the crystalline structure, the acid-base properties and activity of iron based systems in the CO + H{sub 2}O reaction; Influence du support sur la structure cristalline, les proprietes acido-basiques et l'activite des systemes a base de fer en reaction CO + H{sub 2}O

    Energy Technology Data Exchange (ETDEWEB)

    Bouarab, R. [Ecole nationale Polytechnique, Dept. des Sciences Fondamentales, Alger (Algeria); Bouarab, R.; Boudjemaa, A.; Trari, M. [Faculte de Chimie, USTHB, Lab. C. G. N. et L. S. V. E. R., Alger (Algeria); Bennici, S.; Auroux, A. [Institut de Recherches sur la Catalyse et l' Environnement de Lyon, UMR 5256, CNRS-UCB Lyon1, 69 - Villeurbanne (France)

    2009-03-15

    The water gas shift reaction was studied in the temperature range of 350-450 C over iron based catalysts exempt of Cr{sub 2}O{sub 3}. The basic properties and CO conversion of these catalysts are given in the following sequence: Fe{sub 3}O{sub 4}/MgO {>=} Fe{sub 3}O{sub 4}/TiO{sub 2} {>=} Fe{sub 3}O{sub 4} {>=} Fe{sub 3}O{sub 4}/SiO{sub 2}. The basic catalysts are consequently more active than acid ones. On the other hand, the DRX results showed a strong crystalline fraction of MgO in the Fe{sub 3}O{sub 4}/MgO catalyst calcined at 400 C. Hence, Fe{sub 3}O{sub 4}/MgO generates an MgO reservoir able to feed the catalyst surface with formate species during the water gas shift reaction. (authors)

  2. Polarographic study of the Cu(II)/Cu(I) system in the presence of 1-ascorbic acid and 0,1 M ClK; Estudio polarografico del sistema Cu(II)/Cu(I) en presencia del acido 1-ascorbico y en ClK 0,1 M

    Energy Technology Data Exchange (ETDEWEB)

    Alonso Lopez, J.

    1969-07-01

    While studying the catalytic effect of Cu{sup {down_arrow}}2 ions on the oxidation process of 1-ascorbic acid, it has been observed that, in a 0,1 M solution of K1 at a pH 6 to 7, the above acid gives rise in the presence of Cu{sup {down_arrow}}2 ions to a polarographic wave of half-wave potential of -0,41 V (vs. S.C.E.). (Author) 14 refs.

  3. Oxidizing gel formulation for nuclear decontamination: rheological and acidic properties of the organic matrix and its ozonolysis; Formulation d'un gel oxydant a matrice organique applicable a la decontamination nucleaire: proprietes rheologiques, acido-basiques et ozonolyse de la matrice

    Energy Technology Data Exchange (ETDEWEB)

    Rouy, E

    2003-10-15

    An acidic and oxidizing gel was formulated with a purely organic matrix, xanthan gum, at low concentrations (1 to 2 wt %). This polymer gel was investigated in various media (aqueous, acidic and ceric) by means of rheology: shear thinning behaviour, thixotropy, yield stress... Evidences of unexpected rheological properties in highly concentrated media show that xanthan is quite convenient for industrial projection of this type of gel on metallic walls in nuclear plants, notwithstanding its time-limited resistance to oxidation (about a few hours). Complexation mechanisms between ceric species and polar sites of the polymer led us to characterise acidic properties of our xanthan sample by potentiometric titration and {sup 1}H NMR techniques. The matrix was finally treated by ozonolysis to suppress organic residues, as required to handle nuclear wastes. In acidic medium, ozonolysis of the gel was achieved successfully while in acidic and ceric medium this process showed limited efficiency, needing further investigation to be clarified. (author)

  4. Trimerization process of vegetables oils and fats and its application in additives for synthetic fluids used in the perforation of petroleum well bore; Processo de trimerizacao de oleos vegetais e acidos graxos e sua aplicacao em aditivos para fluidos sinteticos utilizados na perfuracao de pocos de petroleo

    Energy Technology Data Exchange (ETDEWEB)

    Moreira, Viviane X.; Souza, Roberta C.R.; Coelho, Anderson S.; Lopes, Grazielle; Yoshida, Renan O.; Goncalves, Gizelle de Fatima G.D.V.; Silva, Sandra Regina da [Centro Tecnico Aeroespacial (CTA), Sao Jose dos Campos, SP (Brazil). Centro de Tecnologia; Poland Quimica Ltda., Macae, RJ (Brazil)

    2007-07-01

    Derivatives of vegetable oils and fatty acids such epoxides, polyols and fatty acid dimmers are industrially used for a variety of polymer applications, such as additives for plastics and composites and in filtration control aid in in perforation fluids as well as in the synthesis of polyamides and polyurethanes. In this article a vegetable oil was chemically modified by trimerization and used as filtration control and in a paraffin based perforation fluid. The rheology and filtration parameters were studied and the results were compared to desired specifications to maintenance of stability of well bore. (author)

  5. The preparation of nucleotides uniformly labelled with carbon-14 by biosynthetic methods. Isolation of adenylic, uridylic, cytidylic,and guanylic acids, from the alkaline hydrolysate of escherichia coli RNA; Preparacion de nucleiotidos uniformemente marcados con 14{sup C}, por via biosintetica. Aislamiento de los acidos adenilico, uridilico, citidilico y guanilico, procedentes de la hidrolisis alcalina de RNA de escherichia Coli.

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Pineda, M. D.; Pacheco Lopez, J.

    1978-07-01

    A method is described for the preparation and analysis of adenylic, uri dilic, cytidi- 11c and guanylic acids, labelled with 14{sup C}. Escherichia coli cells have been labelled by growing them in a medi dia containing glucose-14{sup C} as their only source of carbon. RNA is isolated from the cells, and after hydrolysis of the molecule the resulting nucleotides are separated by gel filtration and exchange chromatography. Chemical and radiochemical purity of the Isolated nucleotides is determined, and also its specific radioactivity. (Author) 30 refs.

  6. Characterization and corrosion behavior of phytic acid coatings, obtained by chemical conversion on magnesium substrates in physiological solution; Caracterizacion y comportamiento frente a la corrosion de recubrimientos de acido fitico, obtenidos por conversion quimica, sobre substratos de magnesio en solucion fisiologica

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez-Alvarado, L. A.; Lomeli, M. A.; Hernandez, L. S.; Miranda, J. M.; Narvaez, L.; Diaz, I.; Garcia-Alonso, M. C.; Escudero, M. L.

    2014-10-01

    In order to improve the corrosion resistance of biodegradable magnesium and AZ31 magnesium alloy implants, a phytic acid coating has been applied on both substrates and their protective effect against corrosion has been assessed. The morphology and the chemical nature of the conversion coating were analyzed by SEM/EDX, XRD and FTIR. The spectra showed that the conversion coating was amorphous, and it was composed of Mg, O, and P on magnesium surface, along with Al, Zn and C on AZ31 alloy. The main coating components were chelate compounds formed by phytic acid and metallic ions. The corrosion resistance of bare and coated samples was evaluated by potentiodynamic polarization technique in Hank's solution at 37 degree centigrade. The results indicate that phytic acid conversion coatings provided a very effective protection to the magnesium substrates studied. (Author)

  7. Evolution evidence of a basic fluid to an acid based in the analysis of hydrothermal alteration of the geothermic field of the Azufres, Michoacan; Evidencias de evolucion de un fluido basico a acido a partir del analisis de la alteracion hidrotermal del campo geotermico de los Azufres, Michoacan

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez Partida, Eduardo [Universidad Nacional Autonoma de Mexico, Mexico, D.F. (Mexico)

    2000-07-01

    Hydrothermal alteration at the Los Azufres geothermal field is mostly composed of calc-silicate minerals that define a propylitic alteration zone, which shows progressive dehydration with depth and temperature increase. A generalized zoning of the calc-silicate zone can be observed, with zeolites in the upper part and epidote-clinozoisite at the deepest levels. An argillic alteration zone overlies the calc-silicate zone and is the dominant surface manifestation of the hydrothermal alteration. In some parts, there is a mineral assemblage composed of kaolinite-alunite-native sulfur-quartz (advanced argillic zone) formed by the interaction of vapor and shallow groundwater. The proto-fluid at the Los Azufres geothermal system is related to a neutral sodium chlorine brine, which favors deep propyllitic alteration (productive zone). This zone is characterized by secondary permeability due to fracturing. At depth the geothermal field is dominated by a pressurized liquid, yielding to vapor at more shallow zone. The gradual change from a liquid to a vapor phase occurs through boiling at depths between 1,200 and 1,500 m, and is accompanied by changes in the hydrothermal alteration mineralogy. The type of alteration passes from proylitic to argillic by means of an oxidation-acidification process, which includes the participation of a gas, particularly CO{sub 2}. Considering the physicochemical characteristic of the brine and the evolution of the paragenetic sequence, the Los Azufres geothermal field could de considered a model for hydrothermal behavior at ore deposits which develop by boiling and oxidation of low sulfidation fossil hydrothermal fluids. [Spanish] En el campo geotermico de Los Azufres la zona de alteracion hidrotermal esta formada en su mayor parte por calcosilicatos (que definen una zona paragenetica del tipo propilitico), los cuales muestran una deshidratacion progresiva conforme se va profundizando e incrementandose la temperatura. Se puede generalizar un zoneamiento evolutivo para los calcosilicatos predominando las zeolitas hacia la cima y la epidota-clinozoicita en los niveles mas profundos. Le sobreyace una zona de argilitizacion que domina las manifestaciones hidrotermales superficiales. En algunas zonas, se tiene la asociacion caolinita-alunita-azufre nativo-cuarzo (zona argilica avanzada) formada por la interaccion vapor-acuifero someros. En el sistema geotermico de Los Azufres el protofluido esta ligado a una salmuera clorurado-sodica de caracter neutro que propicia una alteracion hidrotermal propilitica profunda (zona productoras) y se caracteriza por tener una permeabilidad secundaria debido al fracturamiento. A profundiad el yacimiento es a liquido dominante presurizado para evolucionar a vapor en su parte mas somera. El cambio gradual de la fase liquida a vapor se da por ebullicion a profundidades del orden de 1,200 a 1,500 m, y esta acompanado por cambios igualmente presentes en la mineralogia de alteracion hidrotermal. Ella pasa de propilitica a argilica por un proceso de oxidacion-acidificacion, en donde la participacion de gases, principalmente de CO{sub 2}, es importante. De acuerdo a las caracteristicas fisicoquimicas de la salmuera y la evolucion en las fases parageneticas, el yacimiento de Los Azufres pudiera ser un modelo de comportamiento hidrotermal en el deposito de las menas que se dan por ebullicion y oxidacion de los fluidos hidrotermales fosiles de baja sulfidacion.

  8. Synthesis of zeolites coal ash in surfactant modified in application and removal of orange 8 acid solution: study in batch, fixed bed column and evaluation ecotoxicological; Sintese de zeolitas de cinzas de carvao modificada por surfactante e aplicacao na remocao de acido laranja 8 de solucao aquosa: estudo em leito movel, coluna de leito fixo e avaliacao ecotoxicologica

    Energy Technology Data Exchange (ETDEWEB)

    Magdalena, Carina Pitwak

    2015-09-01

    In this study, synthesized zeolitic material from coal ash and modified cationic surfactant was used for removing the acid dye Orange 8 (AL8) by adsorption process using moving bed and fixed-bed column. The raw material and adsorbents were characterized by different techniques, such as X-ray diffraction, X-ray fluorescence spectroscopy, among others. The adsorption of AL8 was performed by moving bed in order to optimize the results when they are launched in a fixed bed. The effects of adsorption on zeolite AL8 were compared: (1) Effect of counterions Br{sup -} and Cl{sup -} surfactant used in the modification of the zeolite; (2) effect of type of coal ash used as raw material in the synthesis of zeolites (fly and bottom). The following adsorbents were used in the study: fly and bottom zeolite modified by surfactant hexadecyltrimethylammonium bromide (ZLMS-Br-Br and ZPMS-Br) and fly zeolite modified by surfactant hexadecyltrimethylammonium chloride (ZLMS-Cl). The pseudo-second-order kinetic described the adsorption of the dye on all adsorbents. The equilibrium time was reached 40, 60 and 120 min for ZLMS-Br, ZLMS-Cl and ZPMS-Br, respectively. The adsorption equilibrium was analyzed by the equations of the models of linear and nonlinear isotherms of Langmuir, Freundlich, Temkin and Dubinin- Radushkevivh (DR) and the criterion of best fit was evaluated using the error functions.The DR model was adjusted better to the experimental data for the system AL8 / ZLMS-Br, the Freundlich model for AL8 / ZLMS-Cl and Langmuir for AL8 / ZPMS. According to the Langmuir maximum adsorption capacity was 4.67, 1.48 and 1.38 mg g{sup -1} for ZLMS-Br, ZLMS-Cl and ZPMS-Br, in order. In studies employing fixed bed columns, the effects of inlet concentration (20- 30 mg L{sup -1}), flow rate (4.0 -5.3 mL min{sup -1}) and the bed height (5, 5 - 6.5 cm) above the breakthrough curves characteristics in the adsorption system were determined. The Adams-Bohart, Thomas, Yoon-Nelson models were applied to experimental data to predict the breakthrough curves and to determine the parameters that characterize the column. The mathematical models of Thomas and Yoon-Nelson adjusted well to the data of breakthrough curves. The highest bed capacity of 5.3 mg g{sup -1} was obtained using 30 mg L{sup -1} inlet Acid Orange 8 concentration, 5.5 cm bed height and 5.3 mL min{sup -1} flow rate. Acute ecotoxicity tests using Daphnia similis microcrustacean with wastewater (AL8) and after treatment with surfactant modified zeolite were carried out with the purpose of evaluating evidence of possible contamination when launched on the receiving water body. The results of this study showed that samples AL8 dye in aqueous solution does not show any toxic effect, and the treated samples showed toxicity with ZLMS-Br. (author)

  9. Enrichment of nitrogen-15 by Nitrox system. Part 2: determination of the fractionation factor, height of an equivalent theoretical plate and production of nitric acid enriched in nitrogen-15; Enriquecimento de nitrogenio-15 pelo sistema Nitrox. Parte 2: determinacao do fator de fracionamento, altura equivalente de uma placa teorica e producao de acido nitrico enriquecido em nitrogenio-15

    Energy Technology Data Exchange (ETDEWEB)

    Ducatti, Carlos [UNESP, Botucatu, SP (Brazil). Inst. de Biociencias. Dept. de Fisica e Biofisica; Matsui, Eichii [Centro de Energia Nuclear na Agricultura (CENA), Piracicaba, SP (Brazil)

    1997-12-01

    The expression S = f(alpha, P,L,N{sub o},N{sub p}) showed here, allows the simultaneous determination of the isotopic fractionation factor ({alpha}) by Nitrox System and the number of theoretical plates (s) of the column in countercurrent. For the experimental conditions utilized, room temperature, atmospheric pressure, column packing with stainless steel. Gauze spiral type of ({theta} o,4x h 0,4) cm, feed flow (1,4{+-}0,2) cm{sup 3}/min, feed concentration (4,7 {+-} 0,2)M and (0,369{+-} 0,001) atoms % {sup 15}N, the isotopic fractionation factor of HNO{sub 3}/NO system was {alpha} = 1,062 {+-} 0,001. The total number of theoretical plate (s) and height of an equivalent theoretical plate (HETP) of the isotopic exchange column was 45,3 {+-} 7,1 and (9,1 {+-} 1,6) cm, respectively. It was also vefified that the production of H {sup 15} NO{sub 3} in the isotopic exchange column shows a comprise relationship subject to the same time interval, which means to withdrow little quantity of H{sup 15} NO{sub 3} subject to low concentration (130 cm{sup 3} H{sup 15} NO{sub 3}/week; 2.0 atoms % {sup 15} N). (author). 7 refs., 6 tabs., 3 figs.

  10. Enrichment of nitrogen-15 by nitrox system. Part 1: countercorrent column of aqueous nitric acid and nitrogen oxides in gaseous phase; Enriquecimento de nitrogenio-15 pelo sistema Nitrox. Parte 1: coluna de contracorrente entre solucao de acido nitrico e oxidos de nitrogenio na fase gasosa

    Energy Technology Data Exchange (ETDEWEB)

    Ducatti, Carlos [UNESP, Botucatu, SP (Brazil). Inst. de Biociencias. Dept. de Fisica e Biofisica; Bonassi, Jose A.; Matsui, Eichii [Centro de Energia Nuclear na Agricultura (CENA), Piracicaba, SP (Brazil)

    1997-12-01

    In this paper described the operational mode of countercurrent column of aqueous nitric acid and nitrogen oxides (Nitrox System) for the production of nitric acid in the concentration of 5% atoms of {sup 15} N in laboratory. (author). 8 refs., 2 tabs., 1 fig.

  11. Synthesis of polyaniline catalysed by Cu(I), Ni(II) and Fe(II) supported on the polyethylene-i-acrylic acid copolymer; Sintesis de polianilina catalizada por Cu(I), Ni(II) y Fe(II), soportados en el copolimero polietileno-i-acido acrilico

    Energy Technology Data Exchange (ETDEWEB)

    Hernandez, L.; Urena, F.; Lopez, R. [Instituto Nacional de Investigaciones Nucleares, A.P. 18-1027, 11801 Mexico D.F. (Mexico)

    1997-07-01

    In this study the active sites of acrylic acid (AA) were grafted in low density polyethylene (PEBD) using gamma radiation. Subsequently, the graft copolymer PEBD-i-AA was coordinated with different metals such as copper, nickel and iron. The organometallic copolymers so formed were used as catalysts in the aniline polymerization reaction. Finally, it was realized the characterization of the obtained products, determining their thermal properties, copolymer graft percentage, quantification of the metal contained in the complex as well as polymerization and electric conductivity percentages of the poly aniline film. (Author)

  12. Study of conformational and acid-base properties of norbadione A and pulvinic derivatives: Consequences on their complexation properties of alkaline and alkaline earth cations; Etude des proprietes conformationnelles et acido-basiques de la norbadione A et de derives pulviniques: consequences sur leurs proprietes complexantes de cations alcalins et alcalino-terreux

    Energy Technology Data Exchange (ETDEWEB)

    Kuad, P

    2006-01-15

    This work deals with the study of norbadione A, a pigment extracted from mushrooms and known to complex cesium cations. The study of the acid-base properties of norbadione A has allowed to determine the relative acidity of the seven protonable functions of the molecule and to reveal a reversible isomerization of the double exocyclic bond of the pulvinic moieties. The observed change of configuration is induced by a hydrogen bond of the H-O-H type and by electrostatic interactions. Moreover, the microscopic protonation mechanism of the norbadione A has been analyzed, considering three different study media where the acid-base properties of the norbadione A are compared. In the presence of 0.15 mol.l{sup -1} of NaCl, it has been observed a remarkable cooperativity in the protonation of the enol groups. At last, the use of different analytical methods (NMR, potentiometry and calorimetry) has allowed to study the complexing properties of the norbadione A towards cesium and other alkaline and rare earth cations. (O.M.)

  13. Bactérias do acido láctico e leveduras associadas com o queijo-de-minas artesanal produzido na região da Serra do Salitre, Minas Gerais Lactic acid bacteria and yeasts associated with the artisanal Minas cheese produced in the region of Serra do Salitre, Minas Gerais

    Directory of Open Access Journals (Sweden)

    C.D.L.C. Lima

    2009-02-01

    Full Text Available Em 10 fazendas da região da Serra do Salitre, MG, foram coletadas amostras de leite, soro fermentado (pingo, coalhada e queijo frescal para avaliar a microbiota de bactérias láticas e leveduras presentes. Uma diversidade menor de bactérias láticas foi observada durante a produção do queijo quando comparada à de leveduras. As espécies de bactérias láticas mais freqüentes foram Lactococcus lactis, Enterococcus spp., Enterococcus faecalis e Streptococcus agalactiae e de leveduras foram Debaryomyces hansenii e Kluyveromyces lactis. Apenas as populações de Enterococcus spp., Enterococcus faecalis e Leuconostoc mesenteroides apresentaram aumento significativo durante a produção do queijo. As espécies de bactérias láticas e leveduras encontradas nos diferentes substratos estudados podem ser responsáveis pelas características de aroma e sabor do queijo artesanal da Serra do Salitre.Samples of milk, curd, cheese whey, and cheese were collected in 10 farms located at the region of Serra do Salitre, Minas Gerais state. These samples were studied in relation to their lactic acid bacteria and yeast populations. The diversity of lactic acid bacteria species was lower than the diversity of yeasts in these samples. The isolated lactic acid bacteria were Lactococcus lactis, Enterococcus spp., Enterococcus faecalis, and Streptococcus agalactiae; and the yeasts were Debaryomyces hansenii and Kluyveromyces lactis. Only the species Enterococcus spp., Enterococcus faecalis, and Leuconostoc mesenteroides showed an increase in their populations during the production of the artisanal cheese. Lactic acid bacteria and yeasts found in this study could be responsible by the sensorial characteristics of the artisanal cheese produced in the region of Serra do Salitre.

  14. Increase resolution of {sup 13}C NMR spectra of humic acids in solution by previous treatment with 0,03 mol L{sup -1} KCl; Aumento da resolucao de espectros de RMN {sup 13}C de acidos humicos em solucao atraves do tratamento previo com KCl 0,03 mol L{sup -1}

    Energy Technology Data Exchange (ETDEWEB)

    Canellas, Luciano Pasqualoto; Guridi, Fernando; Santos, Gabriel de A. [Universidade Federal Rural do Rio de Janeiro, RJ (Brazil). Dept. de Solos; Rumjanek, Victor Marcos [Universidade Federal, Rio de Janeiro, RJ (Brazil). Dept. de Quimica; Braz-Filho, Raimundo [Universidade Estadual do Norte Fluminense, Campos, RJ (Brazil). Setor de Quimica dos Produtos Naturais

    2001-02-01

    High levels of Fe and Mn present in some soils and compost organic matter decrease the resolution of {sup 13} C NMR spectra of humic substances. Addition of K Cl up to a concentration of 0,03 mol L{sub -}{sup 1} to humic substances extracts followed by centrifugation is an efficient method of eliminating clays and minerals containing high levels of paramagnetic metals such as Fe and Mn thus increasing the resolution of {sup 13} C NMR spectra. (author)

  15. Poderá o carrapato transmitir a lepra?: mais quatro amostras de culturas de bacilos acido-alcool resistentes obtidas de carrapatos (2 de "Amblyomma cajennense"e 2 de "Boophilus microplus" infectados em leprosos do Paraná: 3ª nota May leprosy be transmitted by ticks?: third note

    Directory of Open Access Journals (Sweden)

    H. C. de Souza-Araujo

    1942-01-01

    Full Text Available The AA. carried out experiments in the leprosarium São Roque, State of Paraná, South Brazil, to verify if the cattle tick Boophilus microplus could be experimentally infected in lepers, which was true. The AA. Tried also to be ascertained if Boophilus microplus and Amblyomma cajennense could change of hosts during their feedings which was true, both ticks continue feeding, the last species for many days, after being transferred from one to another leper. The junior A. describes in full their experiments and also a dermatites caused by tick bites. The senior A. brought to Rio de Janeiro most of the infected ticks for examination, which revealed a very high positivity. He smeared the sediments of lots of both species of ticks in Loewenstein medium and after a variable periode of incubation at 37° C. he obtained four new samples of cultures of acid-fast organisms, two from Amblyomma cajennense and two from Boophilus microplus. These cultures are being studied and will be inoculated into laboratory animals. The senior A. inoculated new batches of white rats with sediments of many ticks infected in lepers. Various hypotheses of both previous notes upon the subject now are verified facts. The A. is accumulating facts to draw the conclusions in the future. He also suggested the leprosy workers in the interior of the country to cooperate with him in such important studies, specially in the habitat of lepers in the rural zones of various States.

  16. Preparation of manganese salts of carboxylic acids labelled with ''54Mn and comparison with ''54 MnCl{sub 2} in liquid scintillation counting; Preparacion de sales manganosas de acidos alifaticos monocarboxilicos marcados con ''54 MnCl{sub 2} en medidas por centelleo liquido

    Energy Technology Data Exchange (ETDEWEB)

    Rodriguez Barquero, L.; Arcos Merino, J. M. los; Grau Malonda, A.

    1992-07-01

    Procedures for liquid scintillation sample preparation of manganese dimethylbutirate, decanoate and palmitate, labelled with 54 Mn are described. their quenching effect, spectral evolution and counting stability along several weeks are analysed in liquid scintillation measurements with Toluene. HISafe II. PCS, instagel. Dioxane-naphtalene and Toluene-alcohol. For comparison, Inorganic 54 MnCl-2 samples are also studied, resulting in acceptable counting stability but showing greater quenching and signs of little spectral degradation against the organic samples. (Author)

  17. The sealing of second mandibular temporary molar pits and fissure with the laser of Nd: YAG, phosphoric acid and the glass ionomer cement; Selamento de fossulas e fissura de segundo molar deciduo inferior com laser de Nd: YAG, acido fosforico e cimento de ionomero de vidro

    Energy Technology Data Exchange (ETDEWEB)

    Toda, Maria Aparecida

    2003-07-01

    The main of our study was to check the sealing of second mandibular temporary molar pits and fissure, in vitro, with the laser of Nd: YAG, phosphoric acid at 37% and the glass ionomer cement (CIV, Fuji IX GC).The proposal was to check the structural morphologic changes in the laser irradiation upon the enamel surface to watch the pits and fissure sealing with the glass ionomer cement use after the laser irradiation and to verify the efficiency of the 'double conditioning' (phosphoric acid + Nd: YAG). At the same time we watch the evolution of the temperature in the pulp chamber's inside. Our desire was to achieve a therapeutic alternative technic to prevent the dental caries. The Nd: YAG laser parameters were the same: 79 mJ of energy per pulse; frequency of 5 Hz; mean power of 0,4 W; optical fiber on contact of 320 {mu}m diameter; fluency of 99,52 J/ cm{sup 2}, assuming that the only differential was the time of the laser application on the enamel surface. The samples were prepared with this way: Laser Nd: YAG (53 second) + acid + CIV (Fuji IX); Laser Nd: YAG (53 s); Laser Nd: YAG (20 s + 20 s) + acid + CIV; Laser Nd: YAG (20 s + 20 s); Acid + CIV; Control. Through the scanning electron microscopy (MEV) we noticed fusion and resolidification regions due to the laser irradiation and a better adaptation of the glass ionomer cement when we did the 'double conditioning'. Concerning the temperature increase we can conclude that the echeloned period was the best recommended because the temperature was found in a pattern that would not cause any damage to the dental pulp. For future studies we suggest a longer relaxing time between the laser irradiation, a comparative study of this method with other lasers, the use of other sealing materials and the study with the permanent teeth. (author)

  18. Efectividad del Acido Peracético sobre la reducción de la carga de Esporas de Mohos causantes de Pudrición Poscosecha de Frutas y Hortalizas Effectiveness of Peracetic Acid on fungal Spores reduction of Moulds causing rotting in Fruits and Vegetables

    Directory of Open Access Journals (Sweden)

    María V Kyanko

    2010-01-01

    Full Text Available Se evaluó in vitro la efectividad del ácido peracético sobre la reducción de la carga de esporas de mohos micotoxicogénicos causantes de pudrición de frutas y hortalizas, para determinar su potencial aplicación al control poscosecha de esta patología. Se evaluó tres concentraciones de ácido (0.05%, 0.1 % y 0.3% para determinar su capacidad antifúngica frente a Alternaria alternata, Fusarium graminearum, Aspergillus ochraceus, A. níger, A. flavus, Penicillium roqueforti y P. expansum. Se observó una reducción de la carga de esporas aún a la más baja concentración ensayada, efecto que incrementó con el aumento de la concentración del tratamiento. A una concentración del 0.3 % se logró una mucho mayor reducción de la carga de esporas viables de A. alternata, F. graminearum y A. ochraceus, respectivamente. El ácido peracético podría resultar una alternativa de tratamiento no contaminante para el control poscosecha de la pudrición fúngica.The objective of this work was to determine in vitro the effectiveness of peracetic acid on the load reduction of mould spores that are responsible for rotting in fruits and vegetables to evaluate its potential application to post-harvest control. Three concentrations of peracetic acid (0.05%, 0.1% and 0.3% were used to evaluate its anti-fungal capacity against Alternaria Alternata, Fusarium graminearum, Aspergillus ochraceus, A. niger, A. flavus, Penicillium roqueforti and P. expansum. It was observed reduction of the load of spores using the lowest concentration. This effect was increased with a higher concentration of peracetic acid. It was extremely effective at a concentration of 0.3% against A. alternata, F. graminearum and A. ochraceus. It is concluded that the peracetic acid is a nonpolluting alternative treatment for post-harvest rotting control of fruits and vegetables

  19. Synthesis of aluminum oxide by the polymer precursor method (Pechini) in 4: 1 ratio of citric acid: metal cation: calcination temperature effect; Sintese do oxido de aluminio pelo metodo dos precursores polimericos (Pechini) na relacao 4:1 de acido citrico: cation metalico: efeito da temperatura de calcinacao

    Energy Technology Data Exchange (ETDEWEB)

    Silva, M.C.; Lira, H.L.; Ribeiro, P.C.; Freitas, N.L., E-mail: mirelecsilva@hotmail.com [Universidade Federal de Campina Grande (UFCG), PB (Brazil). Unidade Academica de Engenharia de Materiais

    2014-07-01

    The technology field is nanopowders prominent in science since these materials fall in various sectors regarding their applications. This work aims at the synthesis of aluminum oxide by polymeric precursors in 4:1 ratio of citric acid:metal cation and evaluate the influence of calcination temperature on their structural and morphological characteristics. The samples after reaction were characterized by XRD and thermal analysis. After calcination 500-1200°C the samples were characterized by XRD, SEM and particle size distribution. The results showed that the variation of the calcination temperature is sufficient to achieve a same material with different structural and morphological characteristics. The most stable phase aluminum oxide arose only after calcination at 1100°C, below 900°C, the amorphous material appeared. As regards the morphology, the change was not as significant as compared to the structure. (author)

  20. Characterization of ZrP{sub 2}O{sub 7} modified with oxalic acid and thermodynamic analysis associated to the uranyl (Vi) sorption; Caracterizacion de ZrP{sub 2}O{sub 7} modificado con acido oxalico y analisis termodinamico asociado a la sorcion de uranilo (VI)

    Energy Technology Data Exchange (ETDEWEB)

    Garcia G, N.; Ordonez R, E. [ININ, Carretera Mexico-Toluca s/n, 52750 Ocoyoacac, Estado de Mexico (Mexico); Solis C, D. A. [Universidad Autonoma del Estado de Mexico, Facultad de Quimica, Paseo Colon y Paseo Tollocan, 50120 Toluca, Estado de Mexico (Mexico); Simoni, E.; Drot, R.; Jeanson, A., E-mail: eduardo.ordonez@inin.gob.mx [Universite Paris-Sud, Institut de Physique Nucleaire, Georges Clemenceau No. 15, Orsay (France)

    2013-10-15

    Several physical and chemical tests were carried out to evaluate the influence of the oxalic acid in the uranium (Vi) sorption on the surface of the zirconium diphosphate. The physical analyses consist of atomic force microscopy (AFM) and total organic coal, and the chemists are the calculation of the reaction heat for the hydrate and sorption processes, the reaction speed constant and the sorption yield in the sodium perchlorate systems and of oxalic acid; these tests allow to corroborate that the oxalic acid influences positively in the uranium (Vi) sorption forming a ternary system of ZrP{sub 2}O{sub 7}/(C{sub 2}O{sub 4})/U(Vi), with a single configuration along the ph interval studied. (Author)

  1. Evaluation and characterization of ceramic membranes based on Pdms/SiC containing phosphotungstic acid as electrolytes for PEM-FC; Avaliacao e caracterizacao de membranas ceramicas condutoras a base de PDMS/SiC contendo acido fosfotungstico como eletrolito para PEM-FC

    Energy Technology Data Exchange (ETDEWEB)

    Lima, Marcelo de Oliveira; Guimaraes, Danilo Hansen; Boaventura Filho, Jaime Soares; Jose, Nadia Mamede [Universidade Federal da Bahia (IQ/UFBA), Salvador, BA (Brazil). Inst. de Quimica. Grupo de Energia e Ciencias dos Materiais; Barbosa, Diego Augusto Batista; Paschoal, Carlos William de Araujo [Universidade Federal do Maranhao (DF/UFMA), Sao Luis, MA (Brazil). Dept. de Fisica; Almeida, Rafael Mendonca; Tanaka, Auro Atsushi [Universidade Federal do Maranhao (DQ/UFMA), Sao Luis, MA (Brazil). Dept. de Quimica

    2009-07-01

    This work presents the development of membranes with potential use in Proton Exchange Fuel Cells (PEM-FC), consisting of hybrid materials based on poly(dimethylsiloxane), crosslinked with tetraethyl orthosilicate (TEOS), and reinforced with silicon carbide and phosphotungstic acid. The membrane series PDMS/TEOS/SiC/PWA were prepared by the reaction of PDMS and TEOS, 70/30% proportions in mass, catalyzed by dibutyltin dilaurate. SiC was incorporated in a 25% proportion, and PWA in varied proportions (5, 10, 15 and 20%), by weight. The membranes were characterized by Thermo-Gravimetric Analysis (TGA), X-ray Diffraction, Scanning Electron Microscopy and impedance spectroscopy. SiC and PWA addition to the membrane increased both structure organization and material crystallinity. The insertion of PWA provided an increase in the conductivity. However, maximum conductivity was obtained with concentration levels above 10%. The insertion of SiC associated with the PWA did not influence the conductivity for concentrations between 10 and 20%. (author)

  2. Crystallochemical study of esters derived from 6{alpha}, 7{beta}-diidroxivouacapan-17{beta}-oic acid by x-ray diffraction; Estudo cristaloquimico de esteres derivados do acido 6{alpha}, 6{beta}-di-hidroxivouacapan-17{beta}-oico por difracao de raios-X

    Energy Technology Data Exchange (ETDEWEB)

    Abrahao Junior, Odonirio [Sao Paulo Univ., Sao Carlos, SP (Brazil). Inst. de Quimica

    1995-12-31

    The 6{alpha}, 7{beta}-diidroxivoacapan-17{beta}-oic acid (DVA) is a Furane-diterpene isolated from Peterodon genus. It has anti-inflammatory and analgesic properties. The purpose of this work is the characterisation by x-ray single crystal diffraction technique of esters derived from DVA, to understand the relationship between chemical structure and biological activity of vouacapanes. (author) 15 refs.

  3. Synthesis of chromatographic standards and establishment of a method for the quantification of the fatty ester composition of biodiesel from babassu oil; Sintese de padroes cromatograficos e estabelecimento de metodo para dosagem da composicao de esteres de acidos graxos presentes no biodiesel a partir do oleo de babacu

    Energy Technology Data Exchange (ETDEWEB)

    Urioste, Daniele; Castro, Matheus B.A.; Biaggio, Francisco C.; Castro, Heizir F. de [Universidade de Sao Paulo (USP), Lorena, SP (Brazil). Escola de Engenharia]. E-mail: heizir@dequi.eel.usp.br

    2008-07-01

    Several alkyl esters were synthesized, purified, characterized by {sup 1}H NMR and employed as standards for establishing chromatographic methods to monitor their formation in the synthesis of biodiesel. The efficiency of the chromatographic methods was confirmed with the products of enzymatic transesterification of babassu oil with different alcohols (C{sub 2} to C{sub 4}), using Lipozyme as catalyst. (author)

  4. Evaluation of mitomycin-C effect on biodistribution of {sup 99m}Tc-dimercaptosuccinic acid in BALB/C mice; Avaliacao do efeito da mitomicina-c na biodistribuicao do radiofarmaco acido dimercaptosuccinico marcado com tecnecio-99m em camundongos BALB/C

    Energy Technology Data Exchange (ETDEWEB)

    Gomes, Maria Luisa; Britto, Deise Mara de M.; Freitas, Rosimeire de S.; Bernardo-Filho, Mario [Instituto Nacional do Cancer, Rio de Janeiro, RJ (Brazil). Centro de Pesquisa Basica; Braga, Ana Cristina de S.; Bezerra, Roberto Jose A.C. [Universidade do Estado, Rio de Janeiro, RJ (Brazil). Inst. de Biologia Roberto Alcantara Gomes. Dept. de Biofisica e Biometria

    1999-11-01

    The many desirable characteristics of technetium-99m have stimulated the development of labeling techniques for different molecular and cellular structures. It is accepted that a variety of factors such the drug chemotherapy can alter the biodistribution of radiopharmaceuticals. The unknowledge of these factor may result in an unexpected behavior of the radiopharmaceuticals. Since patients on chemotherapeutic treatment can be submitted to a nuclear medicine procedure, we have studied in mice, the effect of mitomycin-C on the {sup 99m} Tc-DMSA used for kidney scintigraphy. Mitomycin-C is an antineoplastic agent obtained from Streptomyces caesptosus. The metabolism of this drug produces different toxic and inactive metabolites. Mitomycin-C 0.15 mg was administered in Balb/c female with an interval of 72 hours. After one hour of the last dose, 0.3 ml of 9{sup 9m}c-DMSA (7.4 MBq) were injected and after 0.5 h the animals were sacrificed. The organs were isolated and counted in a well counter. The percentage of radioactivity (%ATI) were calculated and statistical analysis were performed (Wilcoxon Test). The results have shown that the %ATI: has increased in stomach and uterus, has decreased in kidney and ovary; has not altered in pancreas, spleen, lung, heart, liver, thymus, thyroid, bone and brain. The increase of % ATI could be justified by the metabolic process or the therapeutical effect of mitomycin-C. As an effect of this drug is observed in the uptake of the {sup 99m} Tc-DMSA by the kidney, probably an alteration in the kidney scintigraphy is expected. However, the increase of %ATI of this radiopharmaceutical in other organs by the mitomycin-C could be evaluated carefully. (author) 12 ref., 2 tabs.

  5. Efectividad del Acido Peracético sobre la reducción de la carga de Esporas de Mohos causantes de Pudrición Poscosecha de Frutas y Hortalizas Effectiveness of Peracetic Acid on fungal Spores reduction of Moulds causing rotting in Fruits and Vegetables

    OpenAIRE

    María V Kyanko; Mara L Russo; Mariela Fernández; Graciela Pose

    2010-01-01

    Se evaluó in vitro la efectividad del ácido peracético sobre la reducción de la carga de esporas de mohos micotoxicogénicos causantes de pudrición de frutas y hortalizas, para determinar su potencial aplicación al control poscosecha de esta patología. Se evaluó tres concentraciones de ácido (0.05%, 0.1 % y 0.3%) para determinar su capacidad antifúngica frente a Alternaria alternata, Fusarium graminearum, Aspergillus ochraceus, A. níger, A. flavus, Penicillium roqueforti y P. expansum. Se obse...

  6. Determination of uranium and {sup 2}10Po in the river Odiel to assess the radioactive impact of acid mine drainage; Determinacion de uranio y {sup 2}10Po en el rio Odiel para valorar el impacto radiactivo de los drenajes acidos mineros

    Energy Technology Data Exchange (ETDEWEB)

    Manjon, G.; Lehritani, M.; Mantero, J.; Diaz Frances, I.; Garcia-Tenorio, R.

    2013-07-01

    Since 1986 this research group has been monitoring of radioactive environmental impact in the estuary of the river Odiel, generated by the factories of production of phosphoric acid from Huelva, that emitting NORM waste. Once closed factories, is observed a second source of contamination: mining drains. To verify this source have been studied concentration levels of natural radionuclides in the waters and sediments of the river Odiel, in areas that are incorporated drains. (Author)

  7. Assessment of micro, macro, toxic elements (Cd, Hg, Pb) and fatty acids profile in consumed fish commercially available in Cananeia and Cubatao, Sao Paulo State; Avaliacao de micro e macroelementos, elementos toxicos (Cd, Hg e Pb) e acidos graxos, em peixes disponiveis comercialmente para consumo em Cananeia e Cubatao, Estado de Sao Paulo

    Energy Technology Data Exchange (ETDEWEB)

    Curcho, Michel Rodrigues da Silva Morales

    2009-07-01

    Aside from their nutritional importance, fish are considered one of the most important bio indicators in aquatic systems for the estimation of pollution levels by toxic metals. This is so, since fish can bio accumulate these elements and they occupy different trophic levels and present different sizes and age. The purpose of the present study was to contribute with important data for the knowledge of nutritional and toxic constituents in muscles of the most consumed fish species from two coastal regions, Cananeia and Cubatao. Cananeia fish species analyzed were: Micropogonias furnieri (Corvina), Macrodon ancylodon (Pescada), Centropomus undecimalis (Robalo peba) and Mugil platanus (Tainha). From Cubatao, Micropogonias furnieri (Corvina), Macrodon ancylodon (Pescada), Menticirrhus americanus (Perna de moca), Sardella braziliensis (Sardinha) and Mugil liza (Tainha). For this study, analytical methodologies were developed and validated, regarding precision and accuracy, by means of certified reference materials. Micronutrients (Ca, Fe, K, Na, Se and Zn) and some trace elements (As, Br, Co, Cr, Rb) in fish muscle were determined by means of neutron activation analysis (NAA). Cold Vapor Atomic Absorption Spectrometry (CV AAS) was used for total Hg determination and Electrothermal Atomic Absorption Spectrometry (ET AAS) for Cd and Pb determinations. Proximate composition determinations according to AOAC methodologies and fatty acids profiles by gas chromatography were done in these muscle fish samples. Regarding fatty acids profile from the {omega}-6 family, Tainha species pool presented the highest values (8.9%) and Pescada species pool the lowest ones (4.4%) for Cananeia species. Fatty acids from the {omega}-3 family, Sardinha pool species presented the highest values (31.8%) for all species analyzed. Regarding micronutrients content great concentration variations between individual of the same species and between different species were observed. Discriminate analysis was used for the values for micronutrient content for all fish species analyzed in order to identify samples of similar chemical composition and respective food habits. Concerning populational risk to toxic elements exposure, in this case As and Hg, it was possible to conclude that Corvina and Pescada from Cananeia and Corvina, Sardinha and Tainha from Cubatao presented the highest values for As exceeding the Brazilian legislation limits for this contaminant. For Hg, all the species analyzed did not exceed the Brazilian legislation limits for predatory and non predatory species. Results from this study also suggest that Corvina species can be used as a bioindicator since this species bioaccumulate metals and remains in the estuary until it reaches adulthood. Thus, Corvina can be considered as a good indicator of the conditions of the coastal region where it inhabits. (author)

  8. Determination of the extractive capacity of para-tert butyl calix[8]arene octa-phosphinoylated towards uranyl ions from an aqueous-acidic-salty medium; Determinacion de la capacidad extractiva del p-ter-butilocalix[8]areno octa-fosfinoilado hacia iones uranilo de un medio acuo-acido salino

    Energy Technology Data Exchange (ETDEWEB)

    Serrano V, E. C.

    2011-07-01

    The extraction properties of octa-phosphinoylated para-tert butyl calix[8]arene (prepared in the laboratory) in chloroform towards uranyl ions from an aqueous-acidic-salty medium (HNO{sub 3}-3.5 NaNO{sub 3}) containing uranyl nitrate salt, was investigated. Two spectroscopic techniques UV/Vis and Luminescence were used for this study. The latter permitted analyze the fluorescence from the uranyl ions influenced by the surrounding medium. Both permitted to learn about the power of this calixarene as extractant towards the mentioned ions. Its extraction ability or capability using this calixarene at 5.91 x 10{sup -4} M towards the uranyl ions was 400% as determined by UV/Vis while fluorescence revealed 100% of uranyl ion extraction. A closed analysis of the results obtained by using these techniques revealed that the stoichiometry of the main extracted species was 1calixarene:2 uranyl ions. The loading capacity of the calixarene ligand towards the uranyl ions was also investigated using both techniques. UV/Vis resulted to be inadequate for quantifying exactly the loading capacity of the calixarene whereas luminescence was excellent indeed, using a 5.91 x 10{sup -4} M calixarene concentration, its loading capacity was 0.157 M of free uranyl ions from 0.161 M of uranyl ions present in the aqueous-acidic-salty medium. The extracts from the ability and capacity studies were concentrated to dryness, purified and the dried extracts were analyzed by infrared and neutron activation analysis. By these techniques it was demonstrated that during the extraction of the uranyl ions by the calixarene ligand they form thermodynamically and kinetically stable complexes, since in the solid state, the 1:2, calixarene; uranyl ions stoichiometry was kept with the minimum formula: (UO{sub 2}){sub 2}B{sub 8}bL{sup 8}(NO{sub 3}){sub 4}(H{sub 2}O){sub 4}CHCl{sub 3}(CH{sub 3}OH){sub 3} the methanol molecules come from its purification. It is proposed that B{sub 8}bL{sup 8} calixarene in chloroform medium is a good extractant for the treatment of nuclear wastes or radioactive wastes containing uranium in a rich aqueous-acidic-salty medium. (Author)

  9. Influencia del [alpha]-tocoferol en la incorporacion y peroxidacion del acido araquidonico en alevines parr de salmon del Atlantico (Salmo salar L.)/Influence of [alpha]-tocopherol on arachidonic acid deposition and peroxidation in Atlantic salmon (Salmo salar L.) fingerlings

    National Research Council Canada - National Science Library

    Patricio Dantagnan; Astrid Domínguez; Aliro Bórquez; Javier Alcaíno; Claudio Pavez; Adrián Hernández

    2012-01-01

      The synergistic effect of arachidonic acid (ARA) (20:4n-6) and a-tocopherol on the accumulation of fatty acids and the peroxidation of lipids in liver and muscle was evaluated in Atlantic salmon (Salmo salar) juveniles...

  10. Teores de gordura e acidos graxos de clones de cacau nas condições do Vale do Ribeira (SP Fat and fatty acids content of cocoa clones under the conditions of Vale do Ribeira, State of São Paulo, Brazil

    Directory of Open Access Journals (Sweden)

    Maria Luiza Sant'Anna Tucci

    1996-01-01

    Full Text Available O Estado de São Paulo é uma das regiões em que se cultiva o cacaueiro (Theobroma cacao L. mais afastadas do equador, com características climáticas distintas daquelas registradas nas regiões tradicionais de cultivo. A manteiga de cacau apresenta características físico-químicas peculiares, estreitamente relacionadas aos teores dos ácidos graxos que a constituem, os quais são influenciados pelas condições climáticas, especialmente a temperatura do ar. No presente trabalho, caracterizaram-se treze genótipos de cacau, da coleção do Instituto Agronômico, em Pariquera-Açu a 24°43' S, 47°53' W e 25 m de altitude, com base no teor de gordura e na composição em ácidos graxo. Os clones estudados foram os seguintes: SCA 6, SCA 12, IAC 1, ICS 39, ICS 60, ICS 95, UF29, UF 613, UF 667, UF 668, UF 677, P 7 e IMC 67. Houve diferenças significativas entre os clones quanto ao teor de gordura, que variou de 50,7%, para o ICS 95, a 57,6%, para o IAC 1. A composição de ácidos graxos diferiu significativamente entre os clones, exceto para o ácido araquídico. A relação entre ácidos graxos saturados e insaturados variou de 1,37 a 1,74: os clones SCA 12, SCA 6 e P 7 diferiram estatisticamente dos clones ICS 39, 60, 95, IMC 67 e UF 668.The State of São Paulo (Brazil represents the farthest region from the equator in which cocoa (Theobroma cacao L. is cultivated, with different climatic conditions from those observed in the traditional growing areas. Cocoa butter shows peculiar physical and chemical characteristics closely related to fatty acids balance, which are influenced by climatic conditions, mainly air temperature. This paper deals with the characterization of 13 clones of cocoa, growing in the State of São Paulo, based on fat content and fatty acid composition for the climatic conditions of Pariquera-Açu Experimental Station, at 24°43' S, 47°53' W and 25 m of altitude. The clones studied were: SCA 6, SCA 12, IAC 1, ICS 39, ICS 60, ICS 95, OF 29, OF 613, OF 667, OF 668, OF 677, P 7 e IMC 67. Significant differences were found for fat content, which varied from 50.7% for ICS 95 to 57.6% for IAC 1. Fatty acid composition differed significantly among the clones, except for araquidic acid. The saturated and unsaturated fatty acids ratio varied from 1.37 to 1.74, and the clones of SCA 12, SCA 6 and P 7 differed statistically for ICS 39, ICS 60, ICS 95, IMC 67 and OF 668 clones.

  11. Crystallochemical study of amides derived from 6{alpha}, 7{beta}-diidroxivoacapan-17{beta}-oic acid by X-ray diffraction; Estudo cristaloquimico de amidas derivadas do acido 6{alpha}, 7{beta}-di- hidroxivouacapan-17 {beta}-oico por difracao de raios-X

    Energy Technology Data Exchange (ETDEWEB)

    Branco, Marcello Cardoso; Prado Gambardella, Maria Teresa do [Sao Paulo Univ., Sao Carlos, SP (Brazil). Inst. de Quimica. Dept. de Quimica e Fisica Molecular

    1995-12-31

    Abstract. The 6{alpha}, 7{beta}-diidroxivoacapan-17{beta}-oic acid (DVA) is a Furane-diterpene isolated from Peterodon genus. It has anti inflammatory and analgesic properties. The purpose of this work is the characterization of amides derived from DVA, in order to understand the relationship between Chemical Structure and Biological Activity of Vouacapanes. The structures of DVA derivatives will be solved by single-crystal X-ray diffraction. (author) 15 refs., 2 figs.

  12. The speciation of products from the reaction of {sup 51} Cr(VI) with mineral acids by high efficiency liquid chromatography; Especiacao dos produtos da reacao entre {sup 51} Cr(VI) e acidos minerais por cromatografia liquida de alta eficiencia

    Energy Technology Data Exchange (ETDEWEB)

    Pezzin, Sergio H.; Collins, Carol H.; Collins, Kenneth E. [Universidade Estadual de Campinas, SP (Brazil). Inst. de Quimica; Archundia, Cielita [Universidad Nacional Autonoma de Mexico, Mexico DF (Mexico). Inst. de Ciencias Nucleares

    1996-07-01

    The speciation of the products from the reaction of {sup 51} Cr(VI) with concentrated acids (HClO{sub 4}, HCl e HF) was carried out by ion chromatography. The separation was made on a Partisil SCX (10 {mu}m) column, using HClO{sub 4} and Ca(ClO{sub 4}){sub 2} solutions as eluents. The eluates were measured by {gamma}-counting. The results for the reaction (1h) of carrier-free {sup 51} Cr(VI) with HCl show that 96.4% from the {sup 51} Cr is not retained on the column (anionic and/or neutral species). A similar result (92.7% not retained) is observed in a Cr(VI)-HF system. However, for the reaction with HClO{sub 4}, 82% of the {sup 51} Cr was observed as a +3 species and only 5.9% as anionic and/or neutral species. (author)

  13. Influence of the acid and basic properties of rhenium oxide supported on alumina catalyst on the catalytic performance in olefin metathesis; Influence des proprietes acido-basiques de l`oxyde de rhenium supporte sur les performances catalytiques en metathese des olefines

    Energy Technology Data Exchange (ETDEWEB)

    Nahama, F.

    1996-11-30

    The aim of this work is to study the influence of the acid-basic properties of rhenium oxide supported on alumina catalyst on the catalytic performance in olefin metathesis. The literature data indicate that the environment of the active site does possess acid properties. However, the nature of the acid sites is still matter of debate. Concerning the Re O{sub x} - Al{sub 2}O{sub 3} interactions, we have shown that perrhenate ions are electrostatically absorbed on alumina. The uptake of rhenium is favoured at acidic pH (below 4), and the absorbed rhenium is in equilibrium with rhenium in solution. The results of rhenium extraction by water strongly suggest that the surface compounds of the calcined Re{sub 2}O{sub 7}/Al{sub 2}O{sub 3} materials is aluminium perrhenate. Characterization of surface acidity of the catalyst by infrared spectroscopy reveals that the initiation of the metathesis reaction is governed essentially by Lewis acidity. This strongly supports the role of Lewis acidity, which is exalted by the increase of the rhenium content and the calcination temperature. Finally, we point out by ammonia adsorption-thermodesorption a band at 1320 cm{sup -1} characteristic of the Lewis acidity of aluminium perrhenate. This result is a second indication of the presence of aluminium perrhenate on the Re{sub 2}O{sub 7}/Al{sub 2}O{sub 3} catalyst surface. (author)

  14. Comparison of the efficacy of carbamazepine, haloperidol and valproic acid in the treatment of children with Sydenham´s chorea: clinical follow-up of 18 patients Comparación de la eficacia de carbamazepina, haloperidol y acido valproico en el tratamiento de niños con corea de Sydenham: seguimiento clínico de 18 pacientes

    Directory of Open Access Journals (Sweden)

    Joaquín Peña

    2002-06-01

    Full Text Available In order to compare and contrast the efficacy of haloperidol, carbamazepine, and valproic acid in the treatment of Sydenham´s chorea a prospective study including 18 cases of this disorder was undertaken. Age of patients ranged from 7 to 15 years. Ten children were female and 8 were male. All but one had generalized, either symmetric or asymmetric chorea. The patients were divided in three equal groups, and were given a standardized dose of each of the drugs built-up over a week. Following therapy, the six children receiving valproic acid showed remarkable improvement, without side effects. Five patients receiving carbamazepine showed improvement without side effects. Only three of the patients that received haloperidol improved. In the 4 cases that did not show clinical improvement after one week of treatment, therapy with valproic acid led to disappearance of the symptoms in a lapse that ranged from 4 to 7 days. Recurrence related to discontinuation of treatment was observed in two patients. In view of the present results we recommend valproic acid as the first choice drug to treat Sydenham chorea.A fin de comparar y contrastar la eficacia de haloperidol, carbamazepina y ácido valproico en el tratamiento de la corea de Sydenham, se realizó un estudio prospectivo que incluyó 18 casos de esta patología. La edad de los pacientes varió de 7 a 15 años. Diez de los niños eran varones y el resto hembras. A excepción de uno de ellos, todos tenían corea generalizada, simétrica ó asimétrica. Los pacientes fueron divididos en tres grupos iguales, a cada uno de los cuales se le administró una dosis estandarizada de los medicamentos mencionados durante una semana. Luego del tratamiento, los seis pacientes que recibieron ácido valproico mostraron mejoría notable sin efectos colaterales. Cinco de los seis pacientes que recibieron carbamazepina exhibieron mejoría sin efectos colaterales. Solo tres de los pacientes que recibieron haloperidol mejoraron. En los cuatro casos que luego de recibir estas dos últimas drogas sin experimentar mejoría clínica luego de una semana, se instaló terapia con ácido valproico, lo que llevó a desaparición de la sintomatología en un lapso de 4 a 7 días. Se observó recaída relacionada con tratamiento discontinuado en dos de los pacientes. A la vista de nuestros resultados, recomendamos el ácido valproico como droga de primera elección en el tratamiento de la corea de Sydenham.

  15. Study of the temperature influence during the uranium (Vi) sorption on surface of ZrP{sub 2}O{sub 7} in presence of oxalic and salicylic acid; Estudio de la influencia de la temperatura durante la sorcion de uranio (VI) en la superficie del ZrP{sub 2}O{sub 7} en presencia de acidos oxalico y salicilico

    Energy Technology Data Exchange (ETDEWEB)

    Garcia G, N.

    2013-07-01

    This work studies the effect of temperature on the uranium (Vi) sorption onto zirconium diphosphate in the presence of organic acids (oxalic and salicylic acids). Zirconium diphosphate was synthesized by a chemical condensation reaction and characterized using several analytical techniques, in order to check its purity. This point is very important because the presence of any impurities or secondary phases may interfere with the hydration and sorption process. Prior to the sorption experiments, three batches of zirconium diphosphate were pre-equilibrated with NaClO{sub 4}, oxalic acid or salicylic acid solutions. The hydrated solids were washed and dried and then again characterized in order to study the interactions between organic acids and zirconium diphosphate surface. Uranium sorption onto zirconium diphosphate (pre-equilibrated with NaClO{sub 4}, oxalic acid and salicylic acid solutions) was investigated as a function of ph, organic acid and temperature (20, 40 y 60 grades C). Thermodynamic parameters for the sorption reactions (enthalpy change, entropy change and Gibbs free energy change) were determined from temperature dependence of distribution coefficient by using the Vant Hoff equation. Solids characterization after hydration shows that exist an interaction between organic acids and ZrP{sub 2}O{sub 7}. This fact was confirmed with the microcalorimetry study, the reaction heat for hydration of zirconium diphosphate in NaClO{sub 4} solution was exothermic (-269.59 mJ) and for hydration of zirconium diphosphate in oxalic acid solution was endothermic (53.64 mJ). The experimental results showed important differences in the sorption mechanisms for the reaction of Uranium with ZrP{sub 2}O{sub 7} in the presence and absence of organic acids. For the zirconium diphosphate hydrated with oxalic acid, the sorption percentage was 50% from lowest ph values. For the zirconium diphosphate hydrated with salicylic acid, the initial concentration of uranium was 6 x 10{sup -4} M and a percentage of 10% was observed in the initial reaction and it reached 100% at ph 5.5. A similar behavior was observed for the zirconium diphosphate hydrated with NaClO{sub 4}, but the initial concentration of uranium was 5 x 10{sup -4} M. The temperature had an important effect on the sorption of uranium onto ZrP{sub 2}O{sub 7}. The reaction of uranium with the solid hydrated with NaClO{sub 4} was exothermic from 20 to 60 grades C, and the reaction with the solid hydrated with organic acids was exothermic from 20 to 40 grades C and endothermic from 40 to 60 grades C. In conclusion, the thermodynamic study indicated that the sorption process was activated chemisorption s. (Author)

  16. Radiomimeticity of the system H{sub 2}O{sub 2}/Fe(II) on nucleic acid components. Kinetics study; Radiomimeticidad del sistema H{sub 2}O{sub 2}/Fe(II) sobre components de Acidos Nucleicos. Estudio Cinetico

    Energy Technology Data Exchange (ETDEWEB)

    Cirauqui, R.; Mingot, F.; Davila, C. A.

    1974-07-01

    The kinetic study of the action of a redox system on DNA monomers allowed us to make criticisms on radiomimetic character of this system. Assuming that in both cases, gamma radiolysis of aerated aqueous solutions and action of H{sub 2}O{sub 2} / Fe(II) system in the same conditions, the reactive species is the OH radical, we propose the kinetic expressions that are confirmed by our experimental results. Some of the accepted G-values are corrected in view of our results. Al so these results put in evidence mechanisms of molecular repair after radical attack. (Author) 79 refs.

  17. Utility of the dimercapto succinic acid pentavalent ({sup 99m} Tc- DMSA V) in the diagnostic of secondary bone leisure at metastasis of diverse primary tumours. Preliminary study; Utilidad del acido dimercapto succinico pentavalente ({sup 99m} Tc-DMSA V) en el diagnostico de lesiones oseas secundarias a metastasis de diversos tumores primarios. Estudio preliminar

    Energy Technology Data Exchange (ETDEWEB)

    Ortega L, N. [Hospital de Especialidades ' Dr. Antonio Fraga Mouret' Centro Medico Nacional ' La Raza' , IMSS Mexico D.F. (Mexico); Pichardo R, P.A. [Medico Nuclear adscrito al servicio de Medicina Nuclear del Hospital de Oncologia, Centro Medico Nacional Siglo XXI, IMSS, Mexico D.F. (Mexico); Marquez H, A. [Departamento de Medicina Nuclear, IMSS, Mexico D.F. (Mexico)

    2005-07-01

    The more used method in the diagnosis of secondary bone lesions to become cancerous it is by means of having derived of phosphates like it is the {sup 99m}Tc- MDP. The reason of acquiring searching with the radiopharmaceutical {sup 99m}Tc- DMSA V is with the purpose to find other bone lesions that are not visualized with the gammagraphy with diphosphonate and therefore to increase the specificity of the study. (Author)

  18. Usefulness of the dimercapto succinic pentavalent acid ({sup 99m} Tc- Dmsa-V) in the diagnostic of the bone metastases illness; Utilidad del acido dimercapto succinico pentavalente ({sup 99m} Tc- DMSA-V) en el diagnostico de la enfermedad osea metastasica

    Energy Technology Data Exchange (ETDEWEB)

    Ortega L, N

    2005-07-01

    The objective of this study was to determine the utility of {sup 99m} Tc-(V)- Dmsa whole body planar scan in the diagnostic of skeletal metastases. Nineteen patients were studied, having a recent {sup 99m} Tc-HDP bone scan reporting different pathologies (3 normal scans, 5 equivocal scans and 11 with disseminated bone metastases). 72 hours later, a whole body planar scan was obtained at 3 and 24 hours after the i.v. administration of {sup 99m} Tc-(V)-Dmsa. Counts per pixel were determined in regions of interest drawn over metastases sites and in normal tissue, and were correlated with the bone scan. Statistical analysis was carried out by using the Kruskal-Wallis analysis of variance followed by Mann Whitney U test. Other comparisons were done with Momios, chi square and t Student tests. 273 lesions were studied in the whole body bone scan and 184 lesions in the {sup 99m} Tc-(V)-Dmsa scintigraphy (t Student test n.s.). The tumor to normal tissue ratios were 3.3 (+/- 0.521) and the soft to normal tissue ratios were 1.01 (+/- 0.01), Mann Whitney p< 0.01. The study sensitivity was 92% an overall specificity was 97%. As conclusions we have that {sup 99m} Tc-(V)-Dmsa scintigraphy is an useful choice in the diagnostic of bone metastases when the whole body planar bone scan ({sup 99m} Tc- HDP) is equivocal or abnormal. It also points out other lesions such as in bone and in soft tissue. (Author)

  19. Optimization of labelling conditions of 15-p-iodophenyl pentadecanoic acid with {sup 123}I and its pharmacokinetics evaluation; Otimizacao das condicoes de marcacao do acido 15-p-iodo fenil pentadecanoico com {sup 123/131} I e sua avaliacao farmacocinetica

    Energy Technology Data Exchange (ETDEWEB)

    Oliveira, Ione Caselato; Colturato, Maria Tereza; Araujo, Elaine Bortoleti de; Barbosa, Marycel Figols de; Muramoto, Emiko; Pereira, Nilda Petrona Sosa de; Silva, Constanca Pagano Goncalves da; Almeida, Maria Aparecida T.M. de [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil)

    1996-07-01

    The 15-p-iodo-phenyl pentadecanoic acid (IPPA) labelled with {sup 123} I is an important radiopharmaceutical for use in cardiology, due to its favorable physical characteristics and its labelling stability. The labelling procedure studies for the preparation of IPPA {sup 123/131} I was according to the procedures described by Dougan et col. The optimization of the labelling of the labelling condition and product stability were evaluated by radiochemical controls and by biological distribution study using animal models. (author)

  20. The combination of resveratrol and CLA does not increase the delipidating effect of each molecule in 3T3-L1 adipocytes La combinación de resveratrol y CLA no incrementa el efecto hipolipemiante de cada molécula en adipocitos 3T3-L1

    Directory of Open Access Journals (Sweden)

    A. Lasa

    2011-10-01

    Full Text Available Introduction: Trans-10, cis-12 conjugated linoleic acid (CLA and resveratrol have been shown to reduce TG content in cultured 3T3-L1 adipocyte acting on different pathways. In recent years, the method of simultaneously targeting several signal transduction pathways with multiple natural products in order to achieve additive or synergistic effects has been tested. However, the combined effect of both molecules on lipid metabolism has not been described before. Objective: The aim of the present work was to analyze the effect of the combination of trans-10, cis-12 CLA and resveratrol on TG accumulation as well as on FAS, HSL and ATGL expression in 3T3-L1 mature adipocytes, in order to assess a potential interaction between both molecules. Methods: For this purpose, 3T3-L1 mature adipocytes were treated with the two molecules, both separately and combined, in 10 and 100 μM for 20 hours. TG content and FAS, ATGL and HSL expression were measured by spectrophotometry and Real Time RT-PCR respectively. Results: Both doses of CLA and 100 M resveratrol decreased TG content in mature adipocytes. The combination of both molecules reduced TG accumulation to the same extent as each one separately. No change in FAS and HSL mRNA levels after CLA and resveratrol treatment was observed. ATGL was not modified by CLA but it was increased by resveratrol and by the combination. This combination did not increase the effect caused by resveratrol on its own. Conclusion: Lipolysis increase via ATGL is involved in the TG reduction induced by resveratrol and the combination of both molecules. The combination of these two molecules does not increase the efficacy of each molecule separately in mature adipocytes and thus it does not represent an advantage for obesity treatment or prevention.Introducción: Se ha demostrado que el ácido linoleico trans-10, cis-12 conjugado (ALC y el resveratrol reducen el contenido de TG en el adipocito 3T3-L1 cultivado actuando sobre

  1. Perfil lipídico da gordura intramuscular de cortes e marcas comerciais de carne bovina Lipid profile of intramuscular fat in meat cattle cuts of commercial brands

    Directory of Open Access Journals (Sweden)

    Angélica Pereira dos Santos Pinho

    2011-05-01

    Full Text Available O trabalho foi realizado para caracterizar a gordura intramuscular dos cortes contrafilé, picanha e costela de seis marcas comerciais (A, B, C, D, E e F de carne bovina comercializadas no município de Porto Alegre, Rio Grande do Sul. As amostras foram coletadas em uma rede de hipermercados. As marcas A e B foram associadas a animais de raças britânicas, as marcas C e D de animais de raças européias produzidos em sistema convencional e orgânico, respectivamente, e provenientes do Uruguai e as marcas E e F de animais sem raça definida e sistema de alimentação não identificado, obtidas em um frigorífico regional e em uma rede de hipermercados, respectivamente. As amostras foram desossadas, moídas, embaladas a vácuo e armazenadas em temperatura de resfriamento até o momento das análises. Em cada amostra foram realizadas a extração dos lipídios e a identificação dos ácidos graxos. O delineamento experimental foi inteiramente casualizado, com arranjo fatorial 6 × 3 e os dados analisados pelo procedimento GLM do aplicativo computacional SAS. Não houve interação significativa entre cortes e marcas para o perfil lipídico dos cortes comerciais. O percentual lipídico foi de 0,95; 3,01 e 0,97% nos cortes contrafilé, costela e picanha, respectivamente. A costela apresentou maior percentual de ácidos graxos (AG saturados e maior estimativa da D9 desaturase a partir do C16:0 e C18:0. O maior percentual de C18:2 cis-9, trans 11, ácido linoleico conjugado, CLA, n-6 e n-3 foi encontrado na picanha. A marca F apresentou maior grau de saturação e a marca D, maior valor de ácidos graxos poliinsaturados, relação poliinsaturados/saturados e trans18 e menor valor de ácidos graxos saturados. Houve interação significativa entre corte e marca para o conteúdo de CLA, sendo o maior conteúdo encontrado no contrafilé da marca F. As características da gordura intramuscular da carne bovina dependem do corte e da marca comercial

  2. EFECTO NEFROPROTECTOR DEL ÁCIDO ASCÓRBICO EN UN MODELO DE DAÑO RENAL INDUCIDO POR GENTAMICINA EN CONEJOS

    Directory of Open Access Journals (Sweden)

    Javier Antonio Padilla Funes

    2013-08-01

    Full Text Available Objetivo. Uno de los efectos secundarios mas notables de la Gentamicina es su nefrotoxicidad. En este estudio se propone el posible efecto nefroprotector del acido ascorbico como barredor de radicales libres de oxigeno. Metodología. Se ejecuto un estudio experimental en 24 conejos machos, raza Nueva Zelanda, cuyo peso fue de 1,5 +/- 0,5 Kg. Los sujetos experimentales fueron distribuidos en tres grupos. El grupo Control se manejo con Gentamicina a dosis de 80 mg/Kg/dia por via IM. El grupo Acido Ascorbico se trato a dosis de 200 mg/kg/dia via IP y Gentamicina 80mg/Kg/dia IM. El grupo Sham se manejo con SSN 0,9% por via IP e IM, durante cinco dias consecutivos, para cada grupo. Se determinaron los siguientes parametros: creatinina serica, N-Acetil s-D glucosaminidasa urinaria (NAG-U, diuresis e histopatologia de las muestras renales. Resultados. La creatinina serica fue significativamente mayor para el grupo Control respecto al grupo Acido Ascorbico (p<0,05. Respecto a la diuresis, se observo una tendencia a la poliuria en el grupo Control. En cuanto a NAG-U, se observo inhibicion completa de la actividad enzimatica en el grupo Acido Ascorbico. El analisis histopatologico demuestra hallazgos de necrosis tubular aguda en el 100% del grupo control, mientras que en el grupo Acido Ascorbico se obtuvo en un 50% de los sujetos unicamente detritos intraluminales. Conclusiones. La administracion concomitante de Acido Ascorbico con Gentamicina, disminuye significativamente el dano tubular renal, evidenciado en los valores de creatinina serica, NAG, diuresis e histopatologia renal.

  3. Enriquecimiento de huevos con ácidos grasos omega-3 mediante la suplementación con semilla de lino (linum usitatissimum) en la dieta

    National Research Council Canada - National Science Library

    Betancourt Fernández, Liliana; Díaz, Gonzalo

    2009-01-01

    ... de huevo, se puede ver afectada por cambios en la composicion de la dieta (2). La grasa saturada y monoinsaturada tiene un menor efecto sobre el perfil de acidos grasos del huevo (3), que la grasa rica en acidos grasos poliinsaturados, la cual puede causar mayores cambios en el perfil (4), permitiendo de esta manera, la manipulacion de la composicion de los lipidos de la yema para cubrir los requerimientos nutricionales de los humanos. El interes sobre la relacion entre la dieta y la salud humana, proveen ...

  4. Influencia de dos aceites ricos en ácido oleico sobre el transporte e incorporación tisular de los triglicéridos

    OpenAIRE

    Perona, Javier S

    2001-01-01

    Existe una sobrada evidencia de que la denominada Dieta Mediterránea está asociada con una disminución de la incidencia de enfermedades cardiovasculares. Este efecto ha sido tradicionalmente atribuido al acido oleico, procedente del aceite de oliva. Sin embargo, el aceite d ... e oliva virgen, pero no otro aceite muy rico en acido oleico, como es el aceite de girasol alto-oleico, reduce la presión arterial en sujetos sanos y pacientes hipertensos. Entre estos dos aceites destacan las diferenc...

  5. Desenvolvimento e caracterização de fosfato de cálcio fluoretado em esmalte dentário

    OpenAIRE

    Marise de Oliveira

    2007-01-01

    Uma alternativa ao condicionamento acido do esmalte para a retencao dos adesivos ou para restaurar caries em esmalte e o crescimento de cristais na superficie do mesmo. Uma tecnica nova de crescimento de cristais, que utiliza uma pasta com solucao de peroxido de hidrogenio e acido fosforico adicionada ao po de fosfato de calcio fluoretado (F-CaP), FHA 110, F-HA 900 ou F-ÀTCP, foi aplicada a superficie do esmalte para a obtencao de recobrimento. Esse procedimento foi feito por 8 vezes na tecni...

  6. Influencia de dos aceites ricos en ácido oleico sobre el transporte e incorporación tisular de los trigliceridos

    OpenAIRE

    Perona, Javier S.

    2001-01-01

    Existe una sobrada evidencia de que la denominada Dieta Mediterránea está asociada con una disminución de la incidencia de enfermedades cardiovasculares. Este efecto ha sido tradicionalmente atribuido al acido oleico, procedente del aceite de oliva. Sin embargo, el aceite d ... e oliva virgen, pero no otro aceite muy rico en acido oleico, como es el aceite de girasol alto-oleico, reduce la presión arterial en sujetos sanos y pacientes hipertensos. Entre estos dos aceites destacan las diferenc...

  7. Inhibición del Oscurecimiento con Mucílago de Nopal (Opuntia ficus indica) en el Secado se Plátano Roatán Inhibition the Darkening with Cactus Mucilage (Opuntia ficus indica) during Drying of Banana Roatán

    OpenAIRE

    Laura V Aquino; Juan Rodríguez; Lilia L Méndez; Kenia F Torres

    2009-01-01

    El objetivo de este estudio fue inhibir el oscurecimiento durante el deshidratado de plátano Roatán (Musa cavendish), usando una solución de mucílago de nopal (Opuntia ficus indica) combinado con diferentes concentraciones de acido cítrico y bisulfito de sodio. El tratamiento se aplicó siguiendo un diseño experimental 2³, siendo los factores y niveles: pre-tratamiento (mucílago-acido cítrico-bisulfito de sodio) y concentración (alta y baja). Para el secado se usaron cortes transversales de pl...

  8. Disease: H00241 [KEGG MEDICUS

    Lifescience Database Archive (English)

    Full Text Available H00241 Combined proximal and distal renal tubular acidosis (RTA type 3) Renal tubular acidos...is (RTA) is characterized by metabolic acidosis, a severe disturbance of extracellular pH homeostas...0 PMID:11045400 (gene) Rodriguez-Soriano J New insights into the pathogenesis of renal tubular acidosis--fro...m functional to molecular studies. Pediatr Nephrol 14:1121-36 (2000) PMID:17557941 (gene) Fry AC, Karet FE Inherited renal acidos...riguez Soriano J Renal tubular acidosis: the clinical entity. J Am Soc Nephrol 13

  9. Selective copper(II acetate and potassium iodide catalyzed oxidation of aminals to dihydroquinazoline and quinazolinone alkaloids

    Directory of Open Access Journals (Sweden)

    Matthew T. Richers

    2013-06-01

    Full Text Available Copper(II acetate/acetic acid/O2 and potassium iodide/tert-butylhydroperoxide systems are shown to affect the selective oxidation of ring-fused aminals to dihydroquinazolines and quinazolinones, respectively. These methods enable the facile preparation of a number of quinazoline alkaloid natural products and their analogues.

  10. NCBI nr-aa BLAST: CBRC-DMEL-01-0033 [SEVENS

    Lifescience Database Archive (English)

    Full Text Available CBRC-DMEL-01-0033 ref|YP_987846.1| methyl-accepting chemotaxis sensory transducer [Acido...vorax sp. JS42] gb|ABM43770.1| methyl-accepting chemotaxis sensory transducer [Acidovorax sp. JS42] YP_987846.1 5.0 27% ...

  11. A Cielo o que e de Cesar: obtido em Roma, o recorde mundial dos 100 metros, a prova mais nobre da natacao, poe Cesar Cielo nos verbetes de enciclopedias do esporte e na historia dos poucos idolos mundiais brasileiros

    National Research Council Canada - National Science Library

    Altman, Fabio

    2009-01-01

    ... lancinante que so tem um remedio: a vitoria. So o primeiro lugar no podio de um campeonato mundial, com o melhor tempo da historia, ou o ouro olimpico, como o dos 50 metros em Pequim, sao capazes de aliviar a sensacao de queimadura interna provocada pelo acumulo de acido latico no sangue quando ele e produzido em esforcos musculares sobre-humanos....

  12. Efficacy and safety of alendronic acid in the treatment of osteoporosis in children.

    Science.gov (United States)

    Martín Siguero, Alberto; Áreas Del Águila, Vera Lucía; Franco Sereno, María Teresa; Fernández Marchante, Ana Isabel; Pérez Serrano, Raúl; Encinas Barrios, Carmen

    2015-11-01

    Objetivos: describir la efectividad y seguridad del uso de acido alendronico en el tratamiento de la osteoporosis en ninos y adolescentes, en condiciones distintas a las autorizadas en la ficha tecnica. Métodos: estudio retrospectivo (2008-2014) de todos los pacientes menores de 18 anos a los que se dispenso acido alendronico para esta indicacion. Los criterios para iniciar tratamiento fueron: densidad mineral osea con puntuacion Z-score ≤ -2,5 DE, antecedentes de fracturas oseas sin traumatismo previo y dolor persistente. Las variables recogidas fueron: demograficas, de tratamiento, clinicas y de seguridad. Se considero efectividad del tratamiento al aumento de la densidad mineral osea hasta obtener Z-score > -2,5 DE. Resultados: un total de 12 pacientes, 8 varones, con una media de edad de 11 anos (} 3 DE), fueron tratados con acido alendronico. Tras un tiempo medio de tratamiento de 2,15 anos (} 1,2 DE), se produjo aumento de la densidad mineral osea en todos los pacientes, 9 de los cuales obtuvieron Z-score > -2,5 DE, por lo que el farmaco se considero efectivo en el 75% de los casos. Ningun paciente presento fracturas oseas ni manifesto efectos adversos durante el tratamiento. Conclusiones: el acido alendronico incremento la densidad mineral osea y se tolero bien en todos los pacientes, por lo que se podria considerar como opcion terapeutica en el tratamiento de la osteoporosis infantil.

  13. AcEST: BP914988 [AcEST

    Lifescience Database Archive (English)

    Full Text Available ctase OS=Delftia acido... 37 0.081 sp|Q9M7D0|TPSD9_ABIGR Terpinolene synthase, chloroplastic OS=Abi... 31 4....LERLQELRDS 210 >sp|Q9M7D0|TPSD9_ABIGR Terpinolene synthase, chloroplastic OS=Abies grandis GN=ag9 PE=1 SV=1

  14. A method for the determination of ascorbic acid using the iron(II)-pyridine-dimethylglyoxime complex

    Energy Technology Data Exchange (ETDEWEB)

    Arya, S. P.; Mahajan, M. [Haryana, Kurukshetra Univ. (India). Dept. of Chemistry

    1998-05-01

    A simple and rapid spectrophotometric method for the determination of ascorbic acid is proposed. Ascorbic acid reduces iron (III) to iron (II) which forms a red colored complex with dimethylglyoxime in the presence of pyridine. The absorbance of the resulting solution is measured at 514 nm and a linear relationship between absorbance and concentration of ascorbic acid is observed up to 14 {mu}g ml{sup -1}. Studies on the interference of substances usually associated with ascorbic acid have been carried out and the applicability of the method has been tested by analysing pharmaceutical preparations of vitamin C. [Italiano] Si propone un rapido e semplice metodo spettrofotometrico per la determinazione dell`acido ascorbico. L`acido ascorbico riduce il ferro(III) a ferro(II) che forma con la dimetilgliossima, in presenza di piridina, un complesso colorato in rosso. L`assorbanza della soluzione risultante e` misurata a 514 nm e si ottiene una relazione lineare tra assorbanza e concentrazione dell`acido ascorbico fino a 14 {mu}g ml{sup -1}. Si sono condotti studi sugli interferenti usualmente associati all`acido ascorbico ed e` stata valutata l`applicabilita` del metodo all`analisi di preparati farmaceutici di vitamina C.

  15. NCBI nr-aa BLAST: CBRC-TBEL-01-0326 [SEVENS

    Lifescience Database Archive (English)

    Full Text Available CBRC-TBEL-01-0326 ref|YP_872485.1| NADH/Ubiquinone/plastoquinone (complex I) [Acido...thermus cellulolyticus 11B] gb|ABK52499.1| NADH/Ubiquinone/plastoquinone (complex I) [Acidothermus cellulolyticus 11B] YP_872485.1 0.90 39% ...

  16. Inhibition of fructan-fermenting equine fecal bacteria and Streptococcus bovis by hops (Humulus lupulus L.) ß-acid

    Science.gov (United States)

    Aims: The goals were to determine if the '-acid from hops (Humulus lupulus L.) could be used to control fructan fermentation by equine hindgut microorganisms, and to verify the antimicrobial mode of action on the Streptococcus bovis, which has been implicated in fructan fermentation, hindgut acidos...

  17. Evaluation of the therapeutic efficacy and radiotoxicity of the conjugates {sup 177}Lu-DOTA-E-c(RGDfK){sub 2} and {sup 177}Lu-DOTA-GGC-AuNP-c[RGDfk(C)] in a murine model and their relationship with the inhibition of the angiogenic factors VEGF and HIF-1α; Evaluacion de la eficacia terapeutica y radiotoxicidad de los conjugados {sup 177}Lu-DOTA-E-c(RGDfK){sub 2} y {sup 177}Lu-DOTA-GGC-AuNP-c[RGDfK(C)] en un modelo murino y su relacion con la inhibicion de los factores angiogenicos VEGF y HIF-1α

    Energy Technology Data Exchange (ETDEWEB)

    Vilchis J, A.

    2013-07-01

    Molecular targeting therapy has become a relevant therapeutic strategy for cancer. The principle that peptide receptors can be used successfully for in vivo targeting of human cancers has been proven, and radiolabeled peptides have been demonstrated to be effective in patients with malignant tumors. Peptides based on the cyclic Arg-Gly-Asp (RGD) sequence have been designed to antagonize the function of α(v)β(3) integrin, thereby inhibiting angio genesis. The conjugation of RGD peptides to radiolabeled gold nanoparticles (AuNP) produces biocompatible and stable m ultimeric systems with target-specific molecular recognition. The aim of this research was to evaluate the therapeutic response of {sup 177}Lu-AuNP-RGD in athymic mice bearing α(v)β(3)-integrin-positive C6 gliomas and compare with that of {sup 177}Lu-AuNP or {sup 177}Lu-RGD. The radiation absorbed dose, metabolic activity (SUV, [18F]fluor-deoxy-glucose-micro PET/CT), renal radiotoxicity, renal and tumoral histological characteristics as well as tumoral VEGF and HIF-1? gene expression (by realtime polymerase chain reaction) following treatment with {sup 177}Lu-AuNP-RGD, {sup 177}Lu-AuNP or {sup 177}Lu-RGD were assessed. Of the radiopharmaceuticals evaluated, {sup 177}Lu-AuNP-RGD delivered the highest tumor radiation absorbed dose (63.8 ± 7.9 Gy) vs other treatments. These results correlated with the observed therapeutic response, in which {sup 177}Lu-AuNP-RGD significantly (p<0.05) reduced tumor progression, tumor metabolic activity, intratumoral vessels and VEGF gene expression compared to the other radiopharmaceuticals. This was consequence of high tumor retention and a combination of molecular targeting therapy (m ultimeric RGD system) and radiotherapy ({sup 177}Lu). There was a low uptake in non-target organs and no induction of renal toxicity. {sup 177}Lu-AuNP-RGD demonstrates properties suitable for use as an agent for molecular targeting radiotherapy. (Author)

  18. Condensed aromatic rings and E{sub 4}/E{sub 6} ratio: humic acids in gleysoils studied by NMR CP/MAS{sup 13}C, and dipolar dephasing; Aneis aromaticos condensados e relacao E{sub 4}/E{sub 6}: estudo de acidos humicos de gleissolos por RMN de {sup 13}C no estado solido utilizando a tecnica CP/MAS desacoplamento defasado

    Energy Technology Data Exchange (ETDEWEB)

    Saab, Sergio da Costa [Universidade Estadual de Ponta Grossa, PR (Brazil). Dept. de Fisica]. E-mail: scsaab@uepg.br; Martin-Neto, Ladislau [Empresa Brasileira de Pesquisa Agropecuaria, Sao Carlos, SP (Brazil)

    2007-03-15

    In this work, seven samples of humic acids extracted from gleysoils were investigated. These studies, using NMR CP/MAS {sup 13}C techniques, did not show significant correlation between the E{sub 4}/E{sub 6} ratio and the degree of aromaticity. However, dipolar dephasing (DD) measurements of condensed aromatic or substituted carbons showed a negative correlation of 0.94. Also, there was a good correlation between the amount of semiquinone free radicals measured by the EPR technique and condensed aromatic rings measured by NMR CP/MAS {sup 13}C with the DD technique. The content of semiquinone free radicals was quantified by EPR spectroscopy and was correlated with the humification (degree of aromaticity) of the humic substances. The results indicated that the E{sub 4}/E{sub 6} ratio identifies the degree of aromatic rings condensation. It was also found that the degree of aromaticity, measured by NMR, as frequently presented in the literature (by conventional CP/MAS), underestimates aromatic rings in condensed structures. (author)

  19. Study of behaviour of Biobeds SM No.7 and Amberlite XAD No.7 chromatographic resins containing di-2-ethyl-hexilphosphoric acid in Eu{sup 3+} and Am{sup 3+} extraction and concentration; Estudo do comportamento das resinas cromatograficas bio-beds SM No.7 e amberlite XAD No.7 contendo o acido di-2-etilexilfosforico na extracao e concentracao de Eu{sup 3+} e Am{sup 3+}

    Energy Technology Data Exchange (ETDEWEB)

    Kuada, Terezinha A.; Felinto, Maria Claudia F. Cunha; Yamaura, Mitiko; Lobao, Afonso S.T. [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil)

    1996-07-01

    The extraction of Eu(III) and Am (III) in extraction chromatograpy has been investigated on the basis of partition and infrared studies. The stationary phases were DHEPA supported on Biobeads SM7 and Amberlite XAD7 and the mobile phase was nitric acid solutions. The system seems to be very good for extraction of Eu and Am. The results obtained shown that the capacity factor of these columns were 251.95 and 3039.15 for Eu and Am respectively for DEHPA/Amberlite XAD No.7 and 349.69 and 3132.79 for Eu and An respectively for DEHPA/Biobeads SM No.7. (author)

  20. Papel da MRP1/bomba GS-X na regulação do potencial redox celular, e a influência do estado redox celular na expressão e atividade da MRP1/bomba GS-X

    OpenAIRE

    2005-01-01

    Uma das complicações que levam o paciente terminal de câncer à morte é a imunossupressão. Por sua vez, a superprodução de prostaglandinas ciclopentenônicas (CP-PGs) no plasma desses indivíduos é um fator de risco para depressão imunológica já que as CP PGs bloqueiam inúmeras interações entre células imunológicas. Estudos de nosso grupo revelaram que células tumorais apresentam alta atividade da ATPase bomba GS X/MRP que exporta conjugados sulfidrila, inclusive CP PG na forma de S-conjugados d...

  1. NUMERICAL STUDY OF APPLE COOLING IN TANDEM ARRANGEMENT

    Directory of Open Access Journals (Sweden)

    MARCIO ARÊDES MARTINS

    2011-01-01

    Full Text Available El enfriamiento conjugado de manzanas dispuestas en tándem en bandejas fue estudiado en este trabajo usando una simulación numérica en CFD. Las ecuaciones gobernantes fueron discretizadas y resueltas usando el método de volúmenes fi nitos sobre mallas no estructuradas triangulares, y fue propuesto un esquema de acoplamiento de transferencia de calor entre la parte sólida y fl uida. El modelo computacional fue validado usando el número de Nusselt local y Nusselt promedio que son reportados en la literatura. La variación del numero de Nusselt y de la distribución de temperatura en las manzanas, fueron encontrados debido al comportamiento conjugado del problema. La aproximación conjugada demostró ser una gran herramienta para optimizar correlaciones convectivas de transferencia de calor reportadas en la literatura.

  2. Misturas de acetato de celulose-brometo de poli{[9,9-bis(6'-N,N,N-trimetilamónio) hexil}fluoreno-fenileno}: preparação, caracterização e cinética de libertação

    OpenAIRE

    Gomes, João Nuno Pinto Lopes

    2010-01-01

    Os polieletrólitos conjugados são materiais importantes com aplicações em áreas como os sensores químico / biológicos, apresentando ainda grande potencial em áreas que incluem sistemas de energia fotovoltaica e diodos emissores de luz (LEDs). Estes polímeros iónicos conjugados também são relevantes para aplicações de auto agregação e para a preparação de filmes utilizando metodologias baseadas no solvente, tais como impressões a jacto de tinta e tela. Os polímeros baseado...

  3. Uso de una técnica de inmunoperoxidasa para la detección de virus de rabia en cortes gruesos de cerebro

    Directory of Open Access Journals (Sweden)

    Jaime E. Castellanos

    1998-06-01

    Full Text Available Con el propósito de evaluar una técnica de avidina-peroxidasa biotinilada, se utilizó el conjugado antirrábico producido en el INS para la detección del virus de rabia en cortes gruesos de cerebros de ratón tratados con varios tipos de fijadores y con varias diluciones del conjugado. Los animales infectados experimentalmente fueron perfundidos vía intracardiaca con varios fijadores; los cerebros se recuperaron, se les hicieron cortes gruesos de 60 pm y se sometieron a la inmunodetección. Se encontró que en las diluciones normalmente usadas en fluorescencia se presentó un fuerte marcaje inespecífico sin mejorar la detección. En este trabajo, se presenta un protocolo fácil y rápido que pudiera ser útil para la obse~aciónd e muestras sospechosas.

  4. Desenvolvimento das barras imunosorventes de agitação e avaliação das técnicas extração sortiva em barra de agitação, microextração em sorvente empacotado e cromatografia líquida para análise de antidepressivos em amostras de plasma

    OpenAIRE

    Fernanda Zampieri Leandro

    2010-01-01

    Neste trabalho, os anticorpos policlonais e monoclonais anti-fluoxetina foram produzidos em coelhos e camundongos, respectivamente, por imunização com o conjugado fluoxetina-soroalbumina bovina. Os anticorpos obtidos foram caracterizados em função da especificidade contra o fármaco por ELISA (enzyme linked immunosorbent assay) e posteriormente, purificados por afinidade em coluna fluoxetina-agarose labmade. Os anticorpos purificados foram imobilizados covalentemente na superfície vítrea das b...

  5. In vitro activity of 2-pyridinecarboxylic acid against trypanosomes of the subgenus Schizotrypanum isolated from the bat Phyllostomus hastatus = Atividade in vitro do ácido 2-piridinocarboxílico em tripanossoma do subgênero Schizotrypanum isolado do morcego Phyllostomus hastatus

    Directory of Open Access Journals (Sweden)

    Paulo Roberto Ceridóreo Corrêa

    2011-09-01

    Full Text Available The effect of 2-pyridinecarboxylic acid (picolinic acid on trypanosomes of the subgenus Schizotrypanum isolated from the bat Phyllostomus hastatus was determined in this study. Picolinic acid, at 50 ƒÊg mL-1, inhibited epimastigote growth by 99% after 12 days incubation. In addition, trypomastigote motility decreased by 50% after 6h and completely after 24h in the presence of 50 ƒÊg mL-1 picolinic acid. The 50% cytotoxic concentration on HEp-2 cell line was275 ƒÊg mL-1 after 4 days incubation. Altogether, these results indicate higher toxicity against trypanosomes. The inhibitory effect of picolinic acid on epimastigote growth can be partially reversed by nicotinic acid and L-tryptophan, suggesting a competitive inhibition. Furthermore, two anti-Trypanosoma (Schizotrypanum cruzi drugs were also evaluated with regard to bat trypanosome growth. Benznidazole, at 50 ƒÊg mL-1, inhibited epimastigote growth by 90% after 12 days incubation. Nifurtimox, at the same concentration, caused 96% growth inhibition after four days incubation. Corroborating a previous study, bat trypanosomes are a good model for screening new trypanocidal compounds. Moreover, they can be used to study many biological processes common to human pathogenic trypanosomatids.O efeito do acido 2- piridinocarboxilico (acido picolinico sobre um tripanossoma do subgenero Schizotrypanum isolado do morcego Phyllostomus hastatus foi determinado neste estudo. O acido picolinico, na concentracao de 50 ƒÊg mL-1, inibiu 99% do crescimento de epimastigotas apos 12 dias de incubacao. Alem disso, houve um decrescimo de 50 e 100% na mobilidade dos tripomastigotas apos 6 e 24h, respectivamente, em presenca de acido picolinico na concentracao de 50 ƒÊg mL-1. A concentracao citotoxica 50% para celulas HEp-2 foi de 275 ƒÊg mL-1 apos quatro dias de incubacao. Esses resultados indicam maior toxicidade contra os tripanossomas. O efeito inibitoriodo acido picolinico sobre o crescimento de

  6. INCUBAÇÃO DO VERDETE COM DIFERENTES FONTES DE ÁCIDOS PARA DISPONIBILIZAÇÃO DE POTÁSSIO, CÁLCIO, MAGNÉSIO DO SOLO.

    Directory of Open Access Journals (Sweden)

    Adriane de Andrade Silva

    2015-10-01

    Full Text Available A rocha verdete é uma fonte possível de utilização como fertilizante potássico. Porém há uma limitação para melhorar sua disponibilização, sendo assim objetivou-se caracterizar o verdete quanto ao potencial de utilização agrícola, observar se ocorrerá aumento da disponibilidade de potássio, cálcio, magnésio quando o verdete for submetido a diferentes doses de ácido húmico e ácido fosfórico. Os testes de incubação foram realizados em potes de poliuretano com uso de LATOSSOLO VERMELHO de textura argilosa, o qual foram incubados tratamentos de diferentes doses de acido fosfórico; acido fosfórico+ acido húmico; acido humico. O ensaio foi conduzido por 90 dias, foram realizadas 2 coletas, aos 45 dias e 90 dias após a incubação. Realizou-se a determinação dos teores de potássio Houve efeito na disponibilização de potássio nos diferentes tratamentos e dosagens dos ácidos. A liberação de potássio foi maior quando se utilizou o ácido húmico de forma exclusiva. Porém houve efeito da utilização do acido fosfórico e do acido fosfórico + acído húmico. O cálcio, em relação ao tratamento controle observou-se um incremento de  53 a 75%. E o magnésio apresentou comportamento similar ao cálcio.  Sendo assim concluiu-se que o verdete apresentou-se uma fonte de potássio com aumento da solubilização quando submetido a ataque dos ácidos testados. O ácido húmico foi a fonte de ácido que melhor disponibilizou o K.  Há efeito das doses de ácido na disponibilização do K, Ca e Mg pela Rocha verdete.

  7. [Hypomyelination with atrophy of the basal ganglia and cerebellum. Contribution of two new cases to a recently reported entity].

    Science.gov (United States)

    Tomás-Vila, Miguel; Menor, Francisco; Ley-Martos, Myriam; Jumillas-Luján, M José; Marco-Hernández, Ana V; Barbero, Pedro

    2014-02-16

    Introduccion. La hipomielinizacion con atrofia de ganglios basales y de cerebelo (H-ABC) es una rara entidad descrita recientemente. Se presentan dos nuevos casos pertenecientes a una misma familia. Casos clinicos. Caso 1: niño de 17 meses con retraso grave en todas las areas, ausencia de lenguaje y de contacto visual. En la exploracion destacaba una microcefalia con tetraparesia espastica. En la resonancia magnetica cerebral se apreciaba atrofia cerebelosa de predominio vermiano con perdida de volumen de ambos nucleos del putamen y la cabeza del caudado, y patron de hipomielinizacion de la sustancia blanca. En la electromiografia se objetivo un patron de polineuropatia cronica de predominio motor. Presento un descenso de los valores de acido homovalinico y de acido 5-hidroxindolacetico. El tratamiento con levodopa/carbidopa no fue efectivo. Caso 2: niña de 11 meses, hermana del caso anterior. Presentaba un retraso grave en todas las areas y en la exploracion clinica se detecto una microcefalia con tetraparesia espastica. La resonancia magnetica cerebral mostro hallazgos superponibles a los del hermano, con hipomielinizacion, atrofia cerebelosa y afectacion putaminal y de ambos caudados; en la electromiografia, hallazgos compatibles con polineuropatia motora de caracter desmielinizante. Presento un descenso de los valores de acido homovalinico y acido 5-hidroxindolacetico en el liquido cefalorraquideo. El tratamiento con levodopa/carbidopa resulto ineficaz. Conclusiones. Estos dos nuevos casos ayudan a caracterizar mejor esta entidad y refuerzan la hipotesis del origen genetico del sindrome, dado que se trata de dos casos pertenecientes a una misma familia.

  8. Chemical Stockpile Disposal Program Final Programmatic Environmental Impact Statement Volume 3: Appendices A-S

    Science.gov (United States)

    1988-01-01

    exposures produce behavioral and cardiovascular symptoms in man. Methylene chloride tested positive for carcinogenicity in rats (Fund. Appl. Toxicol... Cardiovascular Effects of Anticholinesterase Medications," Am. J. Med. Sci. 293(l), 18-23. Auerbach, C. H. 1950. "Differences Between Effects of Chemical...1, 1371-74. B-185 Ghiringhelli, L., and Di Fabio, A. 1957. ." Patologia da acido acetico: osservazioni negli animali da esperimento e nell’uomo

  9. Sintese de derivados do esteviosideo

    OpenAIRE

    2012-01-01

    Resumo: 0 estudo descrito nesta disserta~ao refere-se a sintese de compostos derivados do esteviosideo. 0 esteviosideo e urn glicosideo extraido da Stevia rebaudiana, fornecido pela Esteviafarma Inga Industrial S.A.. Da hidr6lise enzimatica deste composto foi obtido o esteviol, urn diterpeno acido tetraciclico com esqueleto caurenico, do qual foram obtidos alguns derivados. A bibliografia revisada mostrou que muitos diterpenos tetraciclicos naturais apresentam efeitos biol6gicos. Poucos foram...

  10. [CONSUMPTION OF OMEGA- 3 FATTY ACIDS AND DEPRESSIVE SYMPTOMS IN COLLEGE STUDENTS FROM SONORA, MEXICO].

    Science.gov (United States)

    Rubi Vargas, María; González Lomelí, Daniel; Terrazas Medina, Efraín A; Peralta Peña, Sandra L; Jordán Jinez, Ma Lourdes; Ruiz Paloalto, Ma Laura; Cupul Uicab, Lea A

    2015-10-01

    Introducción: estudios recientes sugieren que los niveles bajos de acidos grasos poliinsaturados omega-3 se relacionan con una mayor prevalencia de depresion; sin embargo, los resultados no son concluyentes. Objetivo: evaluar la asociacion entre el bajo consumo de acidos grasos omega-3 y la presencia de sintomas depresivos en jovenes universitarios del noroeste de Mexico. Métodos: se realizo un estudio transversal en una muestra de 706 universitarios de 18 a 24 anos de edad de ambos sexos. La presencia de sintomatologia depresiva se estimo con la escala de Depresion del Centro de Estudios Epidemiologicos (CES-D) empleando un punto de corte ≥ 24. El consumo semanal de acidos grasos alfalinolenico (ALA) y de eicosapentaenoico (EPA) mas docosahexaenoico (DHA) en mg/g de alimento se estimo por medio de un cuestionario de frecuencia de consumo de alimentos validado para la poblacion mexicana. La asociacion del consumo de omega-3 con la presencia de sintomas depresivos se evaluo con modelos de regresion logistica. Resultados: el 67% de los participantes fueron mujeres; en general, el 16,6% presentaron sintomatologia depresiva. El consumo bajo de ALA y EPA + DHA no se asocio con mayor prevalencia de sintomatologia depresiva antes y despues de ajustar por confusores. En aquellos casos con sintomatologia depresiva, los niveles ALA derivados solo de las nueces fueron significativamente menores. Conclusiones: en esta poblacion no se observo asociacion entre el bajo consumo de acidos grasos omega-3 y la sintomatologia depresiva. La posible asociacion entre el consumo de nueces y la sintomatologia depresiva requiere de mas estudios.

  11. Evaluación de la mezcla de un prebiótico y un ácido orgánico en la salud intestinal y parámetros productivos de pollos de engorde

    OpenAIRE

    Jaramillo Benavides, Alvaro Hugo

    2011-01-01

    El objetivo del presente trabajó de investigación fue evaluar el efecto de un ácido orgánico (Acido fumárico) y un prebiótico comercial (Fortifeed®), y la combinación de éstos frente a un antibiótico promotor de crecimiento (Bacitracina de Zn) y un control, en el alimento de pollos de engorde, determinando los parámetros productivos y salud intestinal.

  12. Determinación simultánea de metales con el ácido dietilenotriaminopentaacético (ADTP) por espectrofotometría derivada

    OpenAIRE

    Pérez Iglesias, Julia

    2011-01-01

    [Resumen] SE REALIZO UN ESTUDIO BIBLIOGRAFICO ACERCA DEL USO DEL ACIDO DIETILENOTRIAMINOPENTAACETICO (ADTP) COMO AGENTE QUELATANTE, DESDE SU PRIMERA UTILIZACION POR WANNINEN EN 1975.SE HACE UNA INTRODUCCION TEORICA A LA ESPECTROFOTOMETRIA DE DERIVADAS DE PRIMER Y SEGUNDO ORDEN, ANALIZANDO SUS METODOS, VENTAJAS Y PRINCIPALES APLICACIONES, INCIDIENDO ESPECIALMENTE SOBRE SU APLICACION A LAS DETERMINACIONES SIMULTANEAS DE DIFERENTES CATIONES METALICOS EN SUS MEZCLAS.SE PROPONEN LOS PROCED...

  13. Síntesis de Derivados Fotoactivos de Ácidos Biliares para Aplicaciones Biológicas

    OpenAIRE

    Rohacova ., Jana

    2010-01-01

    Los acidos biliares son esteroides biosintetizados en el higado que actuan como tensoactivos, facilitando la digestion de los lipidos. Para ello, circulan y se reutilizan en un movimiento conocido como circulacion enterohepatica, un proceso muy complejo en el que no todas las etapas estan perfectamente entendidas. Con el proposito de estudiar algunos aspectos relacionados con la circulacion enterohepatica, en la presente Tesis Doctoral se planteo preparar derivados fotoactivos de ...

  14. El ensayo del ácido 2-tiobarbitúrico (atb) para medir la degradación autooxidativa de aceites vegetales comestibles

    OpenAIRE

    Vicario Romero, Isabel María

    1993-01-01

    En esta memoria se lleva a cabo un estudio general sobre el ensayo del acido 2-tiobarbiturico (atb) y su aplicacion a la determinacion de la degradacion autooxidativa de aceites vegetales comestibles. la recopilacion de todo el material cientifico disponible sobre este ensayo hasta el presente nos permite conocer las caracteristicas de la reaccion y su importancia en la valoracion de la degradacion autooxidativa de alimentos y otros sistemas biologicos, asi como las tecnicas empleadas y las a...

  15. Fotólise do ácido salicílico na presença de ciclo dextrina = Photolisys of the salicylic acid in the presence of â-cyclodextrin

    Directory of Open Access Journals (Sweden)

    Reinaldo Aparecido Bariccatti

    2005-01-01

    Full Text Available Neste trabalho, utilizou-se a espectroscopia de UV/VIS para estudar afotodegradacao por luz UV do acido salicilico em cavidade de ƒÀ-ciclo dextrina. Verificou-se uma reducao na velocidade de fotodegradacao do acido salicilico de 34,5% em pH 7 e de 17,5% em pH 4 quando se adiciona a ƒÀ-ciclo dextrina na solucao. O valor obtido para aconstante de dissociacao do complexo acido salicilico e ƒÀ-ciclo dextrina foi de 4,3}0,5 L10-3 mol/L.In this work the UV/VIS spectroscopy was used to study the photo degradation by UV light of the salicylic acid in cavity of ƒÀ-cyclodextrin. A reduction in the speed of degradation of thesalicylic acid of 34.5% in pH 7 and of 17.5% in pH 4 was observed when ƒÀ-cyclodextrin is added to the solution. The obtained value to the constant of dissociation of the salicylic acid complex and of the ƒÀ-cyclodextrin was of 4.3}0.5x10-3 mol/L.

  16. [Use of fish oil lipid emulsions in hospitalized patients under 18 years old with abnormal results in liver tests associated with total parental nutrition].

    Science.gov (United States)

    Giraldo Villa, Adriana; Henao Roldan, Catherine; García Loboguerrero, Fanny; Martínez Volkmar, María Isabel; Contreras Ramírez, Mónica María; Ruiz Navas, Patricia

    2014-04-01

    Introducción: La Nutricion Parental Total (NPT) prolongada esta asociada con complicaciones potencialmente mortales en la poblacion pediatrica como lo es la colestasis. Dentro del soporte nutricional, la fuente de acidos grasos, el contenido de fitoesteroles y la dosis de lipidos se han relacionado con el desarrollo de esta complicacion. Objetivo: Describir el comportamiento de las pruebas hepaticas en pacientes pediatricos con NPT en quienes se uso lipidos a base de acidos grasos omega 3 (omegavenR). Métodos: Estudio retrospectivo, en menores de 18 anos con tratamiento intravenoso por minimo 8 dias con acidos grasos omega 3. Los pacientes fueron inicialmente clasificados en dos grupos: colestasis y alteracion de pruebas hepaticas. Se evaluo el comportamiento de la transaminasa glutamico oxalacetica (TGO), transaminasa glutamico piruvica (TGP), bilirrubina total (BT), bilirrubina directa, gama glutamil transferasa (GGT) y fosfatasa alcalina (FA) antes y despues del tratamiento con omegaven R. Resultados: 33 pacientes cumplieron los criterios de inclusion. Al finalizar la administracion de omegavenR, 82,4% de los pacientes que presentaron inicialmente colestasis mostraron resolucion o mejoria. En el grupo de pacientes con alteracion de pruebas hepaticas 18,8% progresaron a colestasis. Conclusiones: Nuestro estudio sugiere que el uso de omegaven R en pacientes pediatricos con NPT y BD ≥ 2 mg/dL, parece revertir o mejorar la colestasis, mientras que en pacientes con alteracion de pruebas hepaticas aun no se tiene claro su efecto.

  17. Ensamble, diseño y ensayo de un potenciometro computarizado

    Directory of Open Access Journals (Sweden)

    Rocio Bojacá B.

    2010-05-01

    Full Text Available Se ha ensamblado una unidad potenciométrica (U.P. para mediciones de pH y fuerza electromotriz en procesos estáticos y de titulación. La reproducibilidad en mediciones de pH es de 0.013 unidades de pH y 0.01 mi en volumen. El potenciómetro consta de un acoplador de impedancias, un amplificador de ganancia variable y una interfase (convertidor análogico/Digital. El computador utilizado es un Kaypro II y et graficador es Phillips 8154. El software desarrollado incluye tos programas calibra (estandarización de la U.P. en dos pH diferentes, titula, tit140 y Tit1400 (titulaciones ácido-base y Redox y Ajus (cálculos de volimen como función de pH o potencial. En los ensayos de la U.P. se insiste en las diferencias que se observan en las gráficas cuando se titula un Acido Fuerte o un Acido Débil. En el primer caso se propone la denominación Zona Estabilizadora y en et segundo Zona Buffer o amortiguadora, donde se forma el típico sistema Acido/Sal.

  18. Avaliação do potencial antioxidante frente à oxidação lipídica e da toxicidade preliminar do extrato e frações obtidas das frondes de Dicksonia sellowiana (Presl. Hook

    Directory of Open Access Journals (Sweden)

    V. B. OLIVEIRA

    2015-12-01

    Full Text Available RESUMOA espécie Dicksonia sellowiana, conhecida popularmente como xaxim, é uma samambaia natural do continente americano e encontrada no Brasil na Mata Atlântica. Em 2001 foi inserida na lista do IBAMA como espécie ameaçada de extinção em decorrência da exploração para a confecção de vasos para a jardinagem. O presente trabalho descreve o potencial antioxidante lipídico (TBARS e Sistema β-caroteno/ácido linoleico do extrato bruto e frações obtidos através de aparato de Soxhlet de frondes de Dicksonia sellowiana, além da atividade citotóxica e hemolítica in vitro. Pelo método TBARS, todas as amostras testadas apresentaram atividade, destacando a fração acetato de etila e extrato bruto cuja atividade foi comparável ao padrão ácido ascórbico. No sistema β-caroteno/ácido linoleico, a fração acetato de etila e extrato bruto apresentaram inibição da oxidação do ácido linoleico, destaque para a fração acetato de etila que não se diferenciou estatisticamente do padrão BHT. Na avaliação da toxicidade preliminar, não fora observado atividade citotóxica e hemolítica do extrato bruto e frações nos modelos testados. Os resultados demonstram o potencial antioxidante da espécie vegetal nos modelos de inibição da oxidação lipídica sem apresentar toxicidade.

  19. Oil fatty acid composition of eighteen Mediterranean olive varieties cultivated under the arid conditions of Boughrara (southern Tunisia

    Directory of Open Access Journals (Sweden)

    Zarrouk, Mokhtar

    2009-12-01

    Full Text Available In this study, eighteen olive varieties, originating from Spain, France, Italy, Greece and Algeria, and maintained at the olive experimental station of Boughrara (arid region of Tunisia were evaluated for their oil yield and fatty acid composition. The analysis of variance revealed significant differences among varieties for all traits (p En este estudio, dieciocho variedades de aceituna procedentes de España, de Francia, de Italia, de Grecia y de Argelia, cultivadas en la estación experimental del olivo de Boughrara (región árida de Túnez, fueron evaluadas para el rendimiento en aceite y la composición de ácidos grasos. El análisis de la varianza mostró diferencias significativas entre todas las variedades (p < 0.01. El análisis de “clusters” jerárquico clasificó las variedades en tres grandes grupos. El primer grupo incluía un subgrupo compuesto por siete variedades de aceituna Changlot Real, Koroneiki, Verdial de Vélez- Málaga, Coratina, Lechín de Granada, Cornezuelo y Leccino, que se caracterizan por su alto rendimiento en aceite, alto contenido en oleico y bajo contenido en ácidos palmítico y linoleico. Las composiciones de ácidos grasos de aceites provenientes de estas variedades se conforman con estándares internacionales y son mejores si las comparamos con la de Chemlali (el cultivo más abundante en Túnez. Finalmente, los ácidos grasos mayoritarios (palmítico (C16:0, oleico (C18:1 y linoleico (C18:2 de nueve de los aceites de oliva virgen estudiados fueron comparados con los de las mismas variedades cultivadas en sus áreas originarias. A excepción de los aceites Koroneiki y Olivière que mostraron una composición de ácidos grasos inalterable y del aceite Cornezuelo en el que se observó un aumento del nivel de ácido oleico y un descenso del nivel de ácido linoleico, la mayoría de los aceites mostró disminución de ácido oleico y aumento de los porcentajes de ácido palmítico y linoleico, compar

  20. Evaluación químico-nutricional de alimentos secos comerciales en Chile para perros adultos en mantención Chemical nutritional evaluation of dry foods commercially available in Chile for adult dogs at maintenance

    OpenAIRE

    Hodgkinson,S.M.; C. E. Rosales; Alomar,D.; D. Boroschek

    2004-01-01

    El objetivo del estudio fue evaluar, a través de análisis químico, la calidad nutricional de alimentos secos disponibles comercialmente para perros adultos en etapa de mantención. Para cada una de 33 marcas de alimentos se mezclaron muestras de tres lotes distintos, y se analizaron: materia seca (MS), energía bruta, fibra cruda, cenizas totales, proteína cruda, aminoácidos esenciales, grasa cruda, ácido linoleico y minerales. El contenido de energía metabolizable (EM) de los alimentos se esti...

  1. Síndrome de distrés respiratorio agudo (SDRA). El papel de los eicosanoides y su modulación mediante una nutrición parenteral enriquecida con ácidos grasos omega-3

    OpenAIRE

    2014-01-01

    Un primer objetivo de la tesis ha sido estudiar el papel de los eicosanoides en el desarrollo del síndrome de distrés respiratorio agudo (SDRA) mediante el estudio de sus concentraciones. Otro objetivo ha sido analizar si el aporte de una emulsión lipídica administrada por vía parenteral enriquecida con ácidos grasos poliinsaturados de la serie 3 (AGPI n-3) en forma de aceite de pescado y bajo aporte de ácido linoleico (AGPI n-6) puede regular la síntesis de eicosanoides en pacientes con SDRA...

  2. Influence of Isosacarinic acid on the sorption of {sup 2}38Pu, {sup 1}52 Eu, {sup 7}5Se, {sup 6}0Co, {sup 6}3Ni and {sup 1}09Cd on CSH phases of relation different CaO / SiO{sub 2}; Influencia del acido isosacarinico (ISA) en la sorcion de {sup 2}38Pu, {sup 1}52Eu, {sup 7}5Se. {sup 6}0Co, {sup 6}3Ni y {sup 1}09Cd sobre fases CSH de diferente relacion Cao/SiO{sub 2}

    Energy Technology Data Exchange (ETDEWEB)

    Garcia-Gutierrez, M.; Missana, T.; Mingarro, M.; Morejon, J.; Gil, P.; Galan, H.

    2014-07-01

    The storage of radioactive waste on the surface are the main barrier to the migration of radionuclides in concrete and mortar. The alkaline environment created by these materials produce degradation compounds cellulose, from the paper, wood, cotton, etc .., widely present in the contaminated material as waste, to acid isosacarinic. (Author)

  3. Residualidad del ácido sulfúrico aplicado como enmienda, y calculado de acuerdo con la CIC y con la suma de bases, sobre la estabilidad de los agregados en dos suelos salino-sódicos de la zona de Palmaseca, Valle del Cauca Residualidad del acido sulfúrico aplicado como enmienda, y calculado de acuerdo con la c 1c y con la suma de bases, sobre la estabilidad de los agregados en dos suelos salino-sódicos de la zona de palma seca, Valle del Cauca

    Directory of Open Access Journals (Sweden)

    Charry Calle Jairo

    1988-12-01

    Full Text Available Los dos suelos salino-sódicos se cultivaron sucesivamente con algodón (Gossypium hirsutum var. Gossica P-21, soya (Glycine max var. ICA- Tunía y fríjol (Phaseolus vulgaris var. ICA- Gualí. La estabilidad de los agregados para los suelos, tratamientos y cultivos, se comparó calculando el área localizada debajo de cada una de las curvas aditivas porcentuales de los agregados, entre los parámetros menor de 025 mm y 0.42-0.84 mm.Residuality of sulfuric acid applied as amendment and calculated according to CEC and Sum of Exchangeable Bases (Ca, Mg, Na and K on the aggregate stability of two saline-sodic soils from Palmaseca zone , Cauca Valley, successively cultivated in cotton (Gossypium hirsutum var. Gossica P- 211. soybean (Glycine max var. ICA Tunía and bean (Phaseolus vulgaris var. ICA-Gualí was studied. The aggregate stability for two soils, treatments and crops, was compared by calculating the area located below each one of the accumulative percentage curves of aggregates, between less than 025 mm and 0.42-084 mm parameters. The results showed: A percent increase up to 56% in the aggregate stability of both soils, in treatments calculated according to CEC cultivated in soybean, and Sum of Exchangeable Bases cultivated in bean. The characteristic roots do not have a pronounced effect on aggregation. The initial and final chemical analysis of soils cultivated in cotton, bean and soybean showed in general, a 90 to 98% reductions of levels of sulphate, exchangeable sodium and exchangeable sodium percentage.

  4. Protección cardiovascular con flavonoides: enigma farmacocinético

    Directory of Open Access Journals (Sweden)

    Juan Duarte

    2015-12-01

    Full Text Available Objetivos: Los flavonoides ejercen efectos beneficiosos en la prevención de las enfermedades cardiovasculares. En esta revisión trataremos de clarificar algunas preguntas fundamentales respecto a la eficacia, mecanismo de acción y biodisponibilidad de uno de los flavonoides dietéticos más abundante, la quercetina. Métodos: Se utilizó la base de datos de la National Library of Medicine, Washington, DC (MEDLINE: PubMed. Se recopilaron todos los estudios en animales y en humanos disponibles online desde la creación de la base de datos hasta Noviembre de 2015. Resultados: La quercetina produce un efecto vasodilatador y antihipertensor en modelos animales y en individuos hipertensos. Es eficaz en todos los modelos de hipertensión analizados, independientemente del origen de la hipertensión, del estado del sistema renina-angiotensina, del estrés oxidativo, del óxido nítrico y de otros factores. Paradójicamente, a pesar de ejercer efectos sistémicos biológicamente demostrables, no se encuentra en el plasma tras su administración oral y sus metabolitos circulantes muestran una débil actividad in vitro. La quercetina es extensamente metabolizada en derivados metilados y glucurono- y sulfo-conjugados, que son las formas circulantes en el plasma; y glucurono-, pero no sulfo-conjugados, pueden ser hidrolizados a nivel vascular, produciendo la aglicona matriz que se acumula en los tejidos. La conjugación es un proceso reversible y, al menos con respecto a los efectos vasodilatador y antihipertensivo, el ciclo de conjugación-deconjugación parece ser un requisito absoluto. Conclusiones: Los glucurono-conjugados transportan la quercetina y su forma metilada, y liberan en los tejidos la aglicona libre, que es el efector final.

  5. A tecnica de Tai Ji Quan como suporte para o desenvolvimento das habilidades psicofisicas do dançarino contemporaneo

    OpenAIRE

    Ana Cristina Coelho Brandão

    2005-01-01

    Resumo: A idéia central desta pesquisa consiste na aplicação de conceitos teóricos da dança moderna (norte-americana e alemã), abordados por seus pioneiros - Dalcroze, Delsarte, Isadora Duncan, Denishawn, Martha Graham, Doris Humphrey, Rudolf Laban e Mary Wigman - conjugados aos princípios do Tai Ji Quan, mais especificamente no que tange aos seus encadeamentos, visando proporcionar instrumentos técnico-expressivos facilitadores para o dançarino contemporâneo em seu processo criativo e constr...

  6. Polymer-drug conjugates as platforms for combination therapy in the treatment of hormone-dependent breast cancer

    OpenAIRE

    Deladriere, Coralie

    2013-01-01

    1. Objetivos de la Investigación. Los conjugados poliméricos son nanoconstrucciones multicomponente presentes actualmente en clínica como terapia anticancerígena, tanto como agentes únicos, como formando parte de combinaciones. Estos nanoconjugados tienen el potencial de mejorar farmacológicamente el tratamiento de tumores sólidos, debido a una acumulación pasiva en el tumor (efecto ‘EPR’) y a un diferente mecanismo de internalización celular y posterior liberación del fármaco(s). La trans...

  7. How to reach moviegoers: inbound vs. outbound tools in film marketing

    OpenAIRE

    Molnár, Zita

    2012-01-01

    Mestrado em Marketing O mercado cinematográfico vale mundialmente 32.6 mil milhões de dólares (2011) e as receitas crescem ano após ano, mas o numero de bilhetes vendidos tem vindo a decrescer na maioria dos países. Devido a este facto conjugado com uma concorrência feroz, os estúdios de cinema e os marketeers têm que compreender melhor as necessidades dos seus clientes, a fim de alcança-los da forma mais eficiente possível. Entretanto, os estúdios de cinema ainda gastam quantias enormes d...

  8. USO DEL FUEGO: IMPACTOS ATMOSFÉRICOS GLOBALES E INTRAMUROS EN BRASIL Y MÉXICO

    OpenAIRE

    Alejandro de las Heras Islas; Marta Vera Bolaños

    2008-01-01

    La alimentación humana afecta tanto el ambiente como la salud humana. Al analizar el proceso de producción de alimentos, se deduce que el uso de fuego en la agricultura y la cocina producen riesgos conjugados laborales e intramuros, apuntando a una magnitud hasta ahora desconocida de la contaminación atmosférica en el medio rural. Las exposiciones a partículas atmosféricas son tanto agudas como crónicas, y permiten conjeturar una asociación con la primera causa de mortalidad en niños (neumoní...

  9. Estudo teórico de formas condensadas de polianilinas

    OpenAIRE

    Liliana Yolanda Ancalla Dávila

    2005-01-01

    Neste trabalho estudamos o efeito de empacotamento, em diferentes formas condensadas, sobre as propriedades estruturais e eletrônicas de um polímero orgânico conjugado, a polianilina, através de simulações teóricas. A metodologia teórica empregada depende do número de átomos nos sistemas escolhidos, e das propriedades investigadas. Assim, para os filmes com milhares de átomos, utilizamos métodos clássicos para a obtenção das propriedades estruturais. Já para o estudo das propriedades eletrôni...

  10. DETERMINACIÓN DE LA PRESENCIA DE Campylobacter fetus subsp. venerealis EN ALPACAS Y LLAMAS EN LA ZONA DE PUNO.

    OpenAIRE

    Pasquel H., Silvia; Laboratorio de Microbiología y Parasitología Veterinaria,; Casas A., Eva; Laboratorio de Microbiología y Parasitología Veterinaria, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Lima, Perú.; Huanca L., Wilfredo; Laboratorio de Reproducción Animal, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Lima; Lopera B., Luis; Laboratorio de Microbiología y Parasitología Veterinaria, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Lima-Perú.; Huanca M., Teodosio; Estación Experimental IILPA-INIA, Puno

    2011-01-01

    Se evaluó la presencia del Campylobacter fetus subsp. venerealis en camélidos sudamericanos del Centro de Investigación y Producción Quimsachata, Instituto Nacional de Investigación Agraria, ubicado en el departamento de Puno. Se hicieron hisopados de los fluidos vaginales y prepuciales en 244 alpacas y llamas, entre febrero y marzo de 2007. Las muestras se analizaron mediante la prueba de inmunofluorescencia directa, utilizando un conjugado comercial. Ninguna muestra resultó positiva. La pro...

  11. Efecto antioxidante y antihipertensivo de diferentes compuestos fenólicos del aceite de oliva virgen 'in vitro'

    OpenAIRE

    González Gómez-Navarro, Cecilia

    2009-01-01

    Consta de 2 estudios in vitro:1. La valoración de la capacidad antioxidante de 19 compuestos fenólicos del AOV, mediante la Lag Phase de los dienos conjugados de la LDL inducida por Cu2+. Los compuestos fenólicos con mayor actividad antioxidante son, en orden decreciente: luteolina, rutina, hidroxitirosol, oleuropeína y 3,4-DHPEA-EDA. La mezcla de estos 5 compuestos incrementa en 1.8 veces la suma de la Lag Phase de cada uno de los compuestos fenólicos individualmente (p

  12. Aprendizaje paragmático y la enseñanza

    OpenAIRE

    Víctor Roberto Húaquín Mora

    2014-01-01

    El aprendizaje paradigmático, primer objetivo de este trabajo, es producto del pensamiento paradigmático, el cual, se caracteriza por usar, predominantemente,  el pensamiento analógico. Basado en el desarrollo cognitivo de J. Piaget, el pensamiento paradigmático se postula como una quinta etapa del desarrollo cognitivo que agrega construcciones paradigmáticas basadas en el pensamiento lógico y analógico conjugado. El aprendizaje paradigmático, al basarse en el pensamiento paradigmático, surge...

  13. Aprendizaje paragmático y la enseñanza

    OpenAIRE

    Víctor Roberto Húaquín Mora

    2014-01-01

    El aprendizaje paradigmático, primer objetivo de este trabajo, es producto del pensamiento paradigmático, el cual, se caracteriza por usar, predominantemente,  el pensamiento analógico. Basado en el desarrollo cognitivo de J. Piaget, el pensamiento paradigmático se postula como una quinta etapa del desarrollo cognitivo que agrega construcciones paradigmáticas basadas en el pensamiento lógico y analógico conjugado. El aprendizaje paradigmático, al basarse en el pensamiento paradigmático, surge...

  14. Modelo global do ciclo biogeoquímico do carbono-enxofre

    OpenAIRE

    Cleyde Corrêa Roncaratti

    1995-01-01

    Os dois ciclos mais importantes nas reações de oxi-redução, no ambiente de superfície, são o do carbono e o do enxofre que fazem parte de um sistema maior que compreende a atmosfera, biosfera e litosfera sedimentar. Levando isso em conta, partimos de um modelo de simulação numérica do ciclo biogeoquímico global, para investigar o papel do sistema carbono-oxigênio-enxofre. A modelagem se baseia em estudos nos quais o ciclo do carbono é conjugado com o ciclo do enxofre, elaborada a partir dos p...

  15. Los usos de la historia: una reflexión sobre el agua

    OpenAIRE

    Fontana Lázaro, Josep

    2013-01-01

    Las páginas que siguen pretenden ser una propuesta, como ejemplo, de alguna de las muchas formas en que el historiador puede aplicar su trabajo a fines socialmente útiles y con plena conciencia de que lo fundamental es combatir el modelo historiográfico que sirve de base y legitimación a las políticas neoliberales que estamos sufriendo. Ante una población mundial en crecimiento, el miedo al hambre y el estímulo de los altos precios de los alimentos se han conjugado para llevar a gobiernos y g...

  16. SIMULACION COMPUTACIONAL DE PROCESOS DE CONGELACION Y DESHIDRATACION PARA ALIMENTOS SOLIDOS POROSOS Y LIQUIDOS NO NEWTONIANOS

    OpenAIRE

    LEMUS MONDACA, ROBERTO ALEJANDRO

    2012-01-01

    Esta Tesis Doctoral corresponde a parte de las actividades de los Proyectos FONDECYT 1070186 y 1111067, donde se utiliza la modelación matemática y la simulación computacional para describir los fenómenos de transporte de fluidos, calor y masa que ocurren en los procesos de congelación y deshidratación de alimentos sólidos porosos y líquidos no Newtonianos. En paralelo se estudian diferentes características de gran complejidad para cada proceso térmico, como son: uso de modelos conjugados ...

  17. Síndrome da fragilidade biológica em idosos: revisão sistemática

    OpenAIRE

    2012-01-01

    Objetivo O objetivo desse estudo foi identificar a prevalência e as estratégias de avaliação da Síndrome da Fragilidade Biológica em Idosos. Metodologia Para o desenvolvimento deste estudo foi realizada uma busca em base de dados eletrônica (Medline/Pubmed) e lista de referências dos artigos identificados, utilizando os seguintes descritores, na língua inglesa: “frailty e “frail” conjugados com os termos “elderly”, “aging” e “prevalence”. Estes termos/descritores foram combinados usando os op...

  18. Panorámica de la cocina colombiana

    OpenAIRE

    Jaime Alzate

    2003-01-01

    El territorio colombiano, dotado de selvas, cordilleras, valles, mares y ríos, conjugado con las tradiciones culturales propias de cada región, le ha dado a la cocina colombiana variedad y exquisitez. Al recorrer el país encontramos diversidad de platos, ricos en ingredientes naturales y con el sello inconfundible de los pueblos y su arte culinario. Las costas sobre los dos mares hacen uso de su abundancia de mariscos y pescados: la Atlántica, enriqueciendo los platos con tubérculos y carnes ...

  19. Los alimentos ecológocos y el impacto en la salud humana y animal

    OpenAIRE

    Huber, Machteld

    2012-01-01

    Aunque los estudios realizados presentan porcentajes variables en las diferencias, una serie de estudios comparativos entre productos ecológicos y convencionales, muestran un menor contenido de nitratos y menor presencia de residuos pesticidas, y por lo general, niveles más altos de vitamina C y compuestos fenólicos en los productos vegetales ecológicos, así como mayores niveles de ácidos grasos omega-3 y ácido linóleo conjugado en la leche de animales criados en ecológico. Además, recientes ...

  20. Demonstração por imunofluorescência direta de antígenos do vírus da febre amarela em tecido hepático pré-tratado com tripsina

    OpenAIRE

    Schatzmayr,Hermann Gonçalves; Barth, Ortrud Monika; Alencar,Alexandre Alberto de

    1984-01-01

    Neste trabalho descreve-se uma prova de imunofluorescência direta (IFD), com o mesmo material de fragmentos de tecido hepático, fixados em formol, obtidos de casos suspeitos de infecção por febre amarela e utilizados para a histopatologia; um conjugado fluorescente foi preparado com soro de macacos sem anticorpos para hepatite A e B, previamente inoculados com a amostra vacinal 17D de febre amarela. São considerados positivos para febre amarela por esta técnica os casos que apresentaram fluor...

  1. Fabricação e caracterização de filmes Langmuir e Langmuir-Blodgett de derivados do politiofeno

    OpenAIRE

    Nunes, Bruno Moser

    2012-01-01

    Os politiofenos apresentam algumas vantagens em relação aos demais polímeros conjugados como, por exemplo, a facilidade de síntese química e a relativa facilidade de funcionalização de suas cadeias laterais. A maioria dos derivados do politiofeno são insolúveis em água, o que torna possível o processamento desses na forma de filmes ultrafinos pelas técnicas de Langmuir-Blodgett (LB) ou de Langmuir-Schaefer, gerando filmes nanoestruturados e com espessura controlada. Dentro deste contexto, est...

  2. Estudio clínico-experimental de un fóbico: estudios de psicología de szondi

    OpenAIRE

    2012-01-01

    Continuamos nuestros estudios sobre las estructuras instintivas profundas, según las doctrinas y métodos del Análisis del Destino, del eminente heredo-psiquiatra, psicoanalista y psicoterapeuta Dr. L. Szondi. El caso que hoy presentamos es una muestra de la combinación efectiva entre los métodos clínicos, bioeléctricos y psicológicos. Por el empleo sistemático de estos métodos conjugados en la comprensión adecuada de los pacientes mentales, la clínica se coloca en mejores condiciones para un ...

  3. Rações com diferentes fontes de gordura para vacas em lactação

    OpenAIRE

    Costa,Marcone Geraldo

    2008-01-01

    O experimento foi conduzido com o objetivo de avaliar o efeito da suplementação da dieta com fontes lipídicas apresentadas de diferentes formas (livre ou parcialmente protegida) sobre o desempenho produtivo, consumo e dinâmica de nutrientes, perfil de ácidos graxos e conteúdo de ácido linoléico conjugado (CLA) no leite, parâmetros sanguíneos e estimativos de síntese microbiana. Foram utilizadas 10 vacas da raça Holandesa, distribuídas em dois quadrados latinos 5 x 5 balanceados. As dietas exp...

  4. ¿MEJORA EL USO DE ÁCIDO URSODEOXICÓLICO EL PRONÓSTICO PERINATAL EN MUJERES EMBARAZADAS CON COLESTASIA INTRAHEPÁTICA DEL EMBARAZO?

    OpenAIRE

    2007-01-01

    La colestasia intrahepática del embarazo (CIÉ) es un cuadro clínico caracterizado por prurito palmo plantar de predominio nocturno y elevación de ácidos biliares conjugados séricos en el tercer trimestre del embarazo. Esta patología puede asociarse a ictericia y complicaciones como la muerte fetal. Aunque el manejo obstétrico de la CIÉ es eminentemente clínico, el ácido ursodeoxicólico (UDCA) ha sido utilizado efectivamente en el tratamiento sintomático de esta patología y en la corrección de...

  5. Vivência da sexualidade da pessoa com deficiência intelectual profunda : perspectiva dos pais e profissionais

    OpenAIRE

    2014-01-01

    Dissertação de mestrado em Exercício e Saúde em Populações Especiais, apresentada à Faculdade de Ciências do Desporto e Educação Física da Universidade de Coimbra Vivemos num mundo em que o tema da sexualidade está bem presente na nossa vida. A educação sexual é um tipo de conhecimento que é essencial quando se discute o tema da sexualidade, pois verificamos que o próprio conceito da sexualidade é ainda considerado tabu, sendo alvo de mitos e crenças. Ao estudarmos este tema conjugado com ...

  6. GC determination of fatty acids in green beans grown in Galicia (N.W. Spain

    Directory of Open Access Journals (Sweden)

    López Hernández, J.

    1996-06-01

    Full Text Available The concentrations of lauric, myristic, palmitic, palmitoleic, stearic, oleic, linoleic, linolenic, arachidic acids in green beans (Phaseolus vulgaris L. grown in Galicia (N.W. Spain were determinated by capillary gas chromatography (GC. Palmitic acid was the most abundant fatty acid component (113 mg/100 g. of lyophilizate; 35.2% of total fatty acid content, followed by linolenic acid (23.1% and linoleic acid (21.6%.

    Se determinaron, mediante cromatografía gaseosa, las concentraciones de ácidos láurico, mirístico, palmítico, palmitoleico, esteárico, oieico, linoleico, linolénico y araquídico en judías verdes producidas en Galicia (N.O. España. El ácido palmítico fue el más abundante (113 mg/100 g. de liofilizado; 35,2% del contenido total de ácidos grasos, seguido por los ácidos linolénico (23,1% y linoleico (21,6%.

  7. Fat and fatty acid composition of hazelnut kernels in vacuum packages during storage

    Directory of Open Access Journals (Sweden)

    Küçük, Mehmet

    2005-12-01

    Full Text Available The fat contents and fatty acid compositions of three hazelnut cultivars; Tombul, Palaz and Kalinkara were investigated during storage at 21 °C with 60-65 % relative bhumidity. The total fat contents of kernels in vacuum packages increased significantly with storage time. It is believed that the absolute value of fat content does not increase but that the kernel water content and total weight decrease. The palmitic and oleic acid contents of stored hazelnuts increased, while linoleic acid content decreased. No significant differences were found for stearic and linolenic acids during storage.El contenido en grasa y la composición en ácidos grasos de tres cultivares de avellana (Tombul, Palaz y Kalinkara han sido monitorizados durante su almacenamiento a 21 ºC y una humedad relativa del 60-65 %. Los porcentajes de grasa total de las semillas empaquetadas al vacío aumentaron significativamente con el tiempo de almacenamiento. Ello se cree que es debido no a que el valor absoluto de contenido graso aumente, sino a que disminuye el contenido en agua de la semilla y su peso total. Los porcentajes de ácidos palmítico y oleico aumentan en las avellanas almacenadas, mientras que el porcentaje de linoleico descendíó. No se hallaron diferencias significativas en los porcentajes de los ácidos esteárico y linoleico durante el almacenamiento.

  8. Atividade antioxidante e antimicrobiana de extratos de atemoia (Annona cherimola Mill. x A. squamosa L.

    Directory of Open Access Journals (Sweden)

    Suzana Vieira Rabêlo

    2014-01-01

    Full Text Available O objetivo deste trabalho foi quantificar os teores de fenóis e flavonoides totais, bem como avaliar as atividades antioxidante e antimicrobiana de extratos obtidos dos talos e folhas de atemoia (A. cherimola Mill. x A. squamosa L., que pertence à família Annonaceae. A atividade antioxidante foi avaliada pelos métodos de sequestro dos radicais 2,2-difenil-1-picrilhidrazil (DPPH e 2,2'-azinobis-3-etilbenzotiazolina-6-ácido sulfônico (ABTS, bem como pelo método da cooxidação do β-caroteno/ácido linoleico. A avaliação da atividade antimicrobiana dos extratos foi analisada contra 10 cepas de bactérias. Os resultados da atividade antioxidante dos extratos mostraram que o extrato etanólico dos talos (EEt foi o antioxidante mais efetivo (IC50 = 10,44 ± 1,25 µg/mL no método do sequestro do DPPH, bem como no sequestro do radical ABTS (24,81 ± 0,49%. O extrato hexânico das folhas apresentou o melhor percentual de atividade antioxidante no ensaio do β-caroteno/ácido linoleico (41,12 ± 4,35%. Os extratos etanólico dos talos e metanólico das folhas mostraram-se ativos contra cepas de Bacillus cereus, Klebsiella pneumoniae, Staphylococcus aureus resistente à meticilina (MRSA, Staphylococcus aureus e Staphylococcus epidermidis.

  9. [Status epilepticus in paediatrics: a retrospective study and review of the literature].

    Science.gov (United States)

    Moreno-Medinilla, Esther E; Negrillo-Ruano, Rocío; Calvo-Medina, Rocío; Mora-Ramírez, M Dolores; Martínez-Antón, Jacinto L

    2015-05-01

    Introduccion. El estado epileptico (EE) es la emergencia neurologica mas frecuente en pediatria. Dada la posibilidad de secuelas neurologicas y mortalidad asociadas, requiere un tratamiento agresivo precoz. Pacientes y metodos. Estudio descriptivo retrospectivo a traves de la revision de historias clinicas de pacientes ingresados en nuestro hospital entre 2010-2013 con diagnostico de EE. El objetivo fue describir las caracteristicas epidemiologicas y el manejo de estos pacientes, asi como revisar la bibliografia disponible sobre este tema. Resultados. Hemos recogido 39 pacientes (25 varones) y 51 episodios de EE. Edad media: 4,8 años. Tenian enfermedad de base 22 pacientes. Dieciocho eran epilepticos conocidos y cinco tuvieron un EE previo. De los 51 episodios de EE, 33 fueron sintomaticos, 15 febriles y tres criptogenicos. Los tipos de EE fueron: 25 parciales (de ellos, 16 complejos) y 26 generalizados. El tratamiento de primera eleccion fue benzodiacepinas en 47 pacientes (40, diacepam), fenitoina en tres y acido valproico en uno. Veintisiete pacientes precisaron farmacos de segunda linea: 16, acido valproico; ocho, fenitoina; dos, fenobarbital; y uno, levetiracetam. Diez pacientes precisaron farmacos de tercera linea para la induccion del coma: el midazolam fue el mas utilizado en nuestro centro, seguido del tiopental y el propofol. Dos EE superrefractarios requirieron inmunoglobulinas y corticoides sistemicos por presentarse en el curso de encefalitis autoinmunes. Conclusiones. Debe plantearse el esquema terapeutico del EE desde el inicio de cualquier crisis convulsiva. El tratamiento es escalonado, con benzodiacepinas en la primera etapa, antiepilepticos de amplio espectro y disponibilidad intravenosa en la segunda (acido valproico, levetiracetam en el EE generalizado y fenitoina en el EE focal), mientras que el tercer nivel varia en funcion de la experiencia de cada equipo.

  10. Modeling boron separation from water by activated carbon, impregnated and unimpregnated

    Energy Technology Data Exchange (ETDEWEB)

    Ristic, M.; Grbavcic, Z. [Belgrade Univ., Belgrade (BA). Faculty of Technology and Metallurgy; Marinovic, V. [Belgrade Univ., Belgrade (BA). Ist. of Technical Science of the Serbian Academy of Science and Arts

    2000-10-01

    The sorption of boron from boric acid water solution by impregnated activated carbon has been studied. Barium, calcium, mannitol, tartaric acid and citric acid were used as chemical active materials. All processes were performed in a chromatographic continuous system at 22{sup 0} C. Experimental results show that activated carbon impregnated with mannitol is effective in removing boron from water. The separation of boron from the wastewater from a factory for producing enameled dishes by activated carbon impregnated with mannitol was also performed. Two models have been applied to describe published and new data on boron sorption by impregnated activated carbon. Both of them are based on the analysis of boron concentration response to the step input function. This led to a mathematical model that quite successfully described impregnation effects on adsorption capacities. [Italian] E' stato studiato l'assorbimento del boro, mediante carbone attivo impregnato, da soluzioni acquose di acido borico. Quali materiali chimici attivi sono stati utilizzati: bario, calcio, mannitolo, acido tartarico ed acido citrico. Tutti i processi sono stati condotti in un sistema cromatografico continuo a 22{sup 0}C. I risultati sperimentali mostrano che il carbone attivo impregnato con mannitolo e' efficace nella rimozione del boro dall'acqua. E' anche stata effettuata la separazione del boro da acque di scarico di un'industria per la produzione di piatti smaltati mediante carbone attivo impregnato con mannitolo. Sono stati applicati due modelli per descrivere i risultati, pubblicati e nuovi, dell'assorbimento del boro mediante carbone attivo impregnato. Entrambi sono basati sull'analisi della risposta alla concentrazione di boro successivamente incrementata a stadi. Cio' porta ad un modello matematico che descrive abbastanza soddisfacentemente gli effetti dell'impregnazione sulla capacita' di assorbimento.

  11. 3-substituted and 1, 3-disubstituted pyrroles synthesis from {alpha}, {beta} insaturated Nitriles. Formal total synthesis of Danaidona; Sintesis de pirroles 3-sustituidos y 1, 3-disustituidos a partir de Nitrilos {alpha}, {beta}- insaturados. Sintesis total formal de la Danaidona

    Energy Technology Data Exchange (ETDEWEB)

    Garcia, Hector; Flores, Blas; Leon, Fernando; Mendez, Jose Manuel [Universidad Nacional Autonoma de Mexico, Mexico, D.F. (Mexico)

    1996-02-01

    We describe a short method to obtain 3-substituted and 1, 3-disubstituted pyrroles from {alpha}, {beta}-insaturated nitriles. We obtained the corresponding substituted succinonitriles from 1, 4-addition of hydrogen cyanide to {alpha}, {beta}-insaturated nitriles. [Spanish] Se describe un metodo corto para obtener pirroles 3-sustituidos y 1, 3-disustituidos a partir de nitrilos {alpha}, {beta}-insaturados. Se obtuvieron los correspondientes succinonitrilos sustituidos a partir de la adicion 1, 4 de acido cianhidrico a nitrilos {alpha}, {beta}-insaturados.

  12. EFECTO DEL ÁCIDO CLORHÍDRICO Y LA TEMPERATURA EN LA MORFOLOGÍA DE PIEZAS DENTARIAS SANAS. AREQUIPA. 2014

    OpenAIRE

    LOVÓN QUISPE, WASHINGTON EDWARD

    2015-01-01

    TABLAS DE MORFOLOGIA DE LAS PIEZAS DENTARIAS SANAS SOMETIDAS A LA ACCION DEL ACIDO CLORHIDRICO TABLAS DE MORFOLOGIA DE LAS PIEZAS DENTARIAS SANAS SOMETIDAS A LA ACCION DE LA TEMPERATURA LA IDENTIFICACIÓN FORENSE LOS DIENTES ELEMENTOS ARQUITECTÓNICOS DE LOS DIENTES ESTRUCTURA DEL DIENTE EL ESMALTE CARACTERÍSTICAS GENERALES DEL ESMALTE ESTRUCTURA DEL ESMALTE LA DENTINA CARACTERÍSTICAS GENERALES DE LA DENTINA COMPOSICIÓN QUÍMICA DE LA DENTINA EL CEMENTO EL ÁCIDO CLORHÍDRICO RIESGOS DEL ÁCIDO CLO...

  13. Coloraciones histológicas vs microscopia electrónica de transmision para detección de Biopeliculas en pacientes con Rinosinusitis Crónica en el Hospital Universitario de la Samaritana en el año 2011

    OpenAIRE

    Reyes Gelves, Camilo Andres; Gutierrez Guauque, Omar Alberto; Andrade Perez, Rafael Enrique; Contreras Villa, Dimas Dennis

    2013-01-01

    Objetivo: Determinar la concordancia entre microscopia de luz vs microscopia electrónica de transmisión para la detección de Biopeliculas en pacientes con Rinosinusitis Crónica Diseño: Estudio de concordancia. Materiales y Métodos: Analizamos 34 muestras de pacientes llevados a Cirugía Endoscópica Funcional por Rinosinusitis Crónica. Fueron procesadas para valoración mediante microscopia de luz usando Hematoxilina-Eosina, Gram, Acido Peryódico de Schiff, Giemsa y Microscopia Electrónica...

  14. Valoraci??n del estatus de tiamina en un colectivo andaluz y su relaci??n con otros par??metros

    OpenAIRE

    2010-01-01

    INTRODUCCI??N: Las vitaminas del grupo B (piridoxina, riboflavina, cianocobalamina, acido f??lico, etc.) se relacionan estrechamente como componentes de coenzimas que intervienen en procesos de obtenci??n de energ??a para llevar a cabo reacciones metab??licas b??sicas para el organismo como el ciclo de Krebs, el ciclo de pentosa-P, etc... La vitamina B1 es, en ocasiones, desestimada de la lista de sustancias valoradas en una determinada poblaci??n, por descartar la posible deficie...

  15. Utilización de la biomasa residual del cultivo de la piña (Ananas Comosus) para la desproteinización enzimática de desechos de la actividad camaronera

    OpenAIRE

    2013-01-01

    Se realizó un estudio para comprobar la capacidad desproteinizante de extractos proteicos obtenidos a partir de desechos de rastrojo de piña a diferentes concentraciones sobre los sub-productos de la actividad camaronera. El extracto proteolítico de los desechos de rastrojo de piña se obtuvo a partir de desechos de tallos utilizando un buffer de acido sulfúrico. Este extracto se caracterizó al determinar el contenido de proteína, de azucares totales y su actividad enzimática, contra un patrón...

  16. Estudio del etiquetado de los alimentos funcionales

    OpenAIRE

    Delgado González, Patricia

    2016-01-01

    El estudio del etiquetado de los alimentos, fundamentalmente de los alimentos funcionales, se basa en el estudio previo de éstos. Dentro de este grupo podemos encontrarnos distintos componentes como polioles, aminoácidos, ácidos grasos insaturados, fitoesteroles, vitaminas, minerales, bacterias ácido-lácticas, fibra, entre otros. Los probióticos son microorganismos vivos, bacterias acido lácticas saprófitas para nuestro organismo y que nos ayudan a mejorar ciertas funciones como las gastro...

  17. EFECTIVIDAD DE DIFERENTES TRATAMIENTOS EN LA ADHESIÓN SOBRE CERÁMICA DE ZIRCONIO

    Directory of Open Access Journals (Sweden)

    Laura Angélica Hurtado Fino

    2011-12-01

    Full Text Available Normal 0 21 false false false ES-CO X-NONE X-NONE Objetivos: Evaluar el efecto en la adhesión sobre cerámica de zirconio de diferentes tratamientos en ensayos de cizalla. Métodos: 160 cilindros de resina fueron unidos a especímenes de cerámica de zirconio, cerámica feldespática y metal siguiendo diferentes protocolos. Se utilizaron 4 tipos de cemento y se utilizaron 16 diferentes métodos de adhesión. Los cilindros se almacenaron por 24 horas en ambiente húmedo a 37ºC y luego sometidos a prueba de resistencia al corte. El análisis estadístico fue realizado con el análisis de varianza (ANOVA a una y dos vías; procedimiento de diferencia mínima significativa (LSD de Fisher bajo un nivel de significancia del 5% y prueba de Kruskal-Wallis. Resultados: el zirconio tratado, luego de la cerámica feldespática fue el que presentó mayor resistencia de unión al corte. La media general más grande de los grupos de cerámica de zirconio fue el grupo 5 (acido fluorhídrico 8.0859 Mpa, seguida del grupo 8 (coral experimental, 7.62965 Mpa, el grupo 7 (acido nítrico, 6.7618 Mpa, el grupo 6 (acido sulfúrico, 6.24245 Mpa y el grupo 4 (zirconio tratado únicamente con silano, 3.66635 Mpa. En general para la cerámica de zirconio con los diferentes tratamientos superficiales se observa un mejor comportamiento en promedio del cemento RelyX® U100 (3M (8.00428 Mpa que el Multilink® (IVOCLAR (4.95018 Mpa con una diferencia estadísticamente significativa. Conclusión: Los tratamientos superficiales como el acido nítrico a temperatura ambiente y coral experimental sobre la cerámica de zirconio, son una alternativa de fácil manipulación para mejorar valores de adhesión.

  18. CAMBIOS HISTOMETRICOS DEL EPITELIO DE LA MUCOSA PALATINA EN PACIENTES PORTADORES DE PROTESIS COMPLETA

    OpenAIRE

    Watanabe Velásquez, Romel Armando; Magister Profesor Asociado Departamento Académico Estomatología Rehabilitadora. Facultad de Odontología. UNMSM.

    2014-01-01

    With the purpose to observe the variations the dimensions of the eptely and the caver of the cornea, as well as the grade of querationation of the tipper mucous for the use of complete prothesys. Biopsip of tippermucous were done before the work and 60 daip after the installation of the complete prothesys the samples of the biopsip were fixed in metodo from and colouned urtle Hematoxilina and acido peryodico. The measurem were alone, using a micrometric ocular and the results were subject to ...

  19. Estudio del etiquetado de los alimentos funcionales

    OpenAIRE

    Delgado González, Patricia

    2016-01-01

    El estudio del etiquetado de los alimentos, fundamentalmente de los alimentos funcionales, se basa en el estudio previo de éstos. Dentro de este grupo podemos encontrarnos distintos componentes como polioles, aminoácidos, ácidos grasos insaturados, fitoesteroles, vitaminas, minerales, bacterias ácido-lácticas, fibra, entre otros. Los probióticos son microorganismos vivos, bacterias acido lácticas saprófitas para nuestro organismo y que nos ayudan a mejorar ciertas funciones como las gastro...

  20. “uso y evaluación de dos aceites esenciales (canela y clavo de olor) para control de las pudriciones fungosas y determinación de la vida útil mediante películas protectoras comestibles en papaya (carica papaya c.v.hawaiana)”

    OpenAIRE

    Martínez Martínez, Leovina Ingrid

    2013-01-01

    La alta demanda de los consumidores por productos con características naturales y larga vida ha determinado el estudio de nuevas técnicas de preservación y, entre ellas, el estudio de la formulación y desarrollo películas con el fin de ser utilizadas como recubrimiento de alimentos para aumentar su vida útil. Los objetivos del presente trabajo fueron determinar el efecto de la aplicación de una película comestible (almidón de maíz, acido esteárico, glicerol, agua)con diferentes concentracione...

  1. Síntesis y caracterización espectroscópica de sulfatos de hierro: implicaciones en astrobiología y la exploración de Marte

    OpenAIRE

    2015-01-01

    Hay una serie de aspectos que fundamentan la necesidad y el interés de las investigaciones que en este proyecto de tesis se recogen. Por un lado, el interés por los sulfatos de hierro. Estos sulfatos tienen unas características físico químicas y estructurales que suponen un autentico mundo a descubrir y describir, con variadas composiciones, variados comportamientos acido-base y redox, diferentes grados de hidratación y diferentes disposiciones estructurales para mismas composiciones. La ...

  2. Inspección visual con ácido acético (IVAA) en la detección precoz del cancer de cuello uterino :

    OpenAIRE

    Foresi, Ana María del Valle

    2009-01-01

    Tesis Doctor en Medicina y Cirugía -- Universidad Nacional de Córdoba. Facultad de Ciencias Médicas. La Inspección Visual con Acido Acético (IVAA) constituye una alternativa frente a la citología Exfoliativa en el examen de detección del cuello de útero en lugares de escasos recursos o como complemento de papanicolaou en zonas de mediano recursos. OBJETIVOS: Examinar la sensibilidad, especiaficidad, valor predictivo positivo y negativo de los tres métodos de pesquisa (inspección visual con...

  3. Estudio de adsorción de boro con amberlite IRA 743

    OpenAIRE

    Marín Martínez, Alberto J.

    2011-01-01

    Este proyecto estudia los equilibrios y las cinéticas de adsorción de boro en forma de acido bórico en medio acuoso, mediante Amberlite IRA743, una resina de políestireno copolimerizado con divinilbenceno. Se realizan equilibrios a diferentes concentraciones para obtener una isoterma de adsorción y su ecuación corresponiente. Se hacen ensayos a distintas concentraciones de cinéticas de adsorción en batch y mediante balances de materia, la ecuación de equilibrio de la isoterma hayada y l...

  4. Rani neurološki ishod novorođenčadi s intrauterinim zastojem u rastu

    OpenAIRE

    Starčević, Mirta

    2012-01-01

    Uvod: intrauterini zastoj u rastu (IUGR) se smatra osobitim čimbenikom rizika za pojavu neurorazvojnih odstupanja i nepovoljan dugoročni neurorazvojni ishod. Ciljevi istraživanja: utvrditi prediktivnu vrijednost doplerskih parametara fetalne cirkulacije, te parametara acido-baznog statusa iz krvi pupkovine za rani neurološki ishod novorođenčadi s IUGR-om. Odrediti optimalne granične vrijednosti praćenih parametara fetalne cirkulacije koji ukazuju na rizik neuroloških posljedica...

  5. Uso del ácido 2-formilbezoico en la obtención de sistemas heterocíclicos fusionados de interés biológico

    OpenAIRE

    2012-01-01

    En este trabajo se presenta el uso del acido 2- formilbenzoico en la obtención de nuevos sistemas heterocíclicos con potencial actividad biológica. Dichos sistemas están formados por la unión del sistema isocumarínico al sistema imidazolico por medio dos átomos compartidos; la síntesis de las isocumarinas fue realizada por la metodología reportada por Opatz1 a partir de una reacción multicomponentes. Una vez sintetizada la isocumarina se intentó realizar la síntesis One Pot del sistema fus...

  6. Expresiones del CD44 en tejidos periapicales inflamados.

    OpenAIRE

    Siragusa, Martha; Dietrich, Gustavo; Pisterna, Gabriela; D'Arrigo, Mabel

    2012-01-01

    Recibido: Noviembre 2011 - Aceptado: Marzo 2012 El granuloma periapical es una lesión inflamatoria crónica causada por una infección poli bacteriana. Las moléculas de adhesión del CD44 están fuertemente expresadas en células variadas tales como los leucocitos, células parenquimatosas e incluyendo células endoteliales, en células epiteliales y en células musculares. Tiene interacción con el Acido Hialurónico, con el colágeno, lamininas y fibronectina y juega un rol importante en la migraci...

  7. Multímetro como sistema de medición alternativo en las valoraciones potenciométricas

    OpenAIRE

    José de Jesús Pérez-Saavedra; Sonia Rincón-Arce; Miguel Ángel Cisneros-Valladares

    2015-01-01

    En el presente trabajo, experimentalmente se demuestra que las valoraciones potenciométricas usuales en química analítica (acido-base, redox, complejométricas y de halogenuros) pueden llevarse a cabo utilizando como sistema indicador de punto de equivalencia, un multímetro en vez del potenciómetro, mediante la prueba estadística de t de Student; y se posibilita con esto que los laboratorios de docencia se puedan equipar mejor y a bajo costo, con multímetros en vez de potenciómetros.

  8. Monocapas de ácidos grasos I. Ácido esteárico sobre disoluciones acuosas de etanol

    OpenAIRE

    Rodríguez Patino, J. M.; de la Fuente Feria, J.; Gómez Herrera, C.

    1991-01-01

    Monocapas de ácidos grasos. I. Acido esteárico sobre disoluciones acuosas de etanol. Se ha estudiado la estructura y estabilidad de monocapas de ácido esteárico esparcidas sobre disoluciones acuosas que contienen etanol. Las experiencias se han realizado en una iaalanza de superficie comercial tipo Langmuir y se ha operado en condiciones isotérmicas. Las monocapas presentan estructuras de tipo sólida o de líquido condensado en función de la concentración de etanol en la subíase. La estructura...

  9. El aceite de pescado atenua las crisis convulsivas inducidas por hipertermia en ratas neonatas

    OpenAIRE

    Leopoldo E. Flores M.; Miguel A. Guevara; Alfredo Feria-Velasco; Luís Cerdán S.; Marisela Hernández-González

    2008-01-01

    Un alto porcentaje (50-60%) del cerebro en los mamíferos son principalmente grasas o lípidos, de éstos, el 35% son ácidos grasos esenciales, en particular los llamados omegas (O), como el Acido Docosahexanoico (DHA) y el Eicosapentanoico (EPA) llamados omega 3 (O-3). Diversos estudios han mostrado beneficios en la salud con la implementación de los O-3 como agentes terapéuticos en alteraciones cardiovasculares, renales, dérmicas, metabólicas, neurodegenerativas e inmunológicas. Evidencias ...

  10. Impacto del arsénico en yacimientos auríferos

    OpenAIRE

    Hidalgo Velasco, María del Rosario

    2006-01-01

    El presente trabajo tiene por objeto expresar los mecanismos naturales de generación del arsénico en la minería su movilidad y su solubilidad en ambientes acuosos como el Drenaje Acido de Roca (DAR) y agua de los ríos. Para lo cual se plantea alternativas de remoción y mitigación del arsénico en diferentes escalas de caudal; para aguas que satisfagan la Ley General de Aguas (LGA) clase III y la ley del agua potable. The present thesis trys to explain the natural process for Acid Drainage c...

  11. Diseño y elaboración de un software a medida para la interpretación de gases sanguíneos

    OpenAIRE

    Junco González, José Luis

    2013-01-01

    El análisis de los gases sanguíneos se ha convertido en un reto para el personal médico, realizar una interpretación completa en muchos casos suele ser difícil y algunos profesionales no logran hacerlo de una forma adecuada, con el diseño, y desarrollo de un software, que asista a los intensivistas para la interpretación de gases sanguíneos, el cual comprenda oxigenación, ventilación, acido-base y perfusión, se contribuirá a un mejor proceso diagnostico, monitoreo y tratamiento de pacientes e...

  12. Química de especies del genero espeletia Espeletia killipii - Espeletia tunjana

    Directory of Open Access Journals (Sweden)

    Rubén Darío Torrenegra

    2010-07-01

    Full Text Available De las partes aéreas de 2 especies del género Espeletia se aislaron compuestos del tipo diterpeno Acido (-i-Kaur-9( 11, 16-dien-19-oico, el (-Kaur-16-en-19-ol, los terpenos friedeiina, sitosterol-estigmasterol, y dos sesquiterpenlactonas del tipo melampólido, Acetato de Longipilin y Polimatin B. Los últimos compuestos no reportados hasta el momento en la química del género Espeletia. Del extracto etanólico se identificaron dos flavonoides: Quercetina y 3-metoxiquercetina.

  13. IMPACTO EN AFLUENTES DEL RÍO PILCOMAYO POR CONTAMINANTES ADICIONALES DE DRENAJE ÁCIDO DE MINAS DESDE CERRO RICO, POTOSÍ-BOLIVIA

    OpenAIRE

    William H.J. Strosnider; Freddy S. Llanos; Cristina E. Marcillo; Ruben R. Callapa; Robert W. Nairn

    2014-01-01

    La minería intensiva y el procesamiento del cuerpo mineralizado del Cerro Rico de Potosí (Bolivia) ha ocurrido desde 1545. Para avanzar la investigación sobre descargas de drenaje acido de minas (DAM) y su conexión a la contaminación río abajo, se generaron datos en dos muestreos durante la temporada más extrema de lluvia y sequía. Las concentraciones en el DAM y arroyos receptores de Ag, B, Ba, Mo, Sb, Se, Sn, y V fueron superiores a los límites de descarga permitidos por la legislación Boli...

  14. Utilização de um novo material mesoporoso funcionalizado PABA-MCM-41 na remoção de hidrocarbonetos policíclicos aromáticos (HPAs)

    OpenAIRE

    Costa, José Arnaldo Santana

    2013-01-01

    Este trabalho descreve a sintese e caracterizacao do material mesoporoso MCM-41 e do novo material mesoporoso funcionalizado PABA-MCM-41 para serem utilizados como materiais adsorventes na remocao dos HPAs benzo[k]fluoranteno (B[k]F), benzo[a]pireno (B[a]P) e benzo[b]fluoranteno (B[b]F). Os dois materiais foram sintetizados pelo metodo hidrotermal, sendo que PABA-MCM-41 foi sintetizado pelo metodo hidrotermal/co-condensacao, o qual foi funcionalizado pelo acido 4-aminobenzoico modificado. Os ...

  15. Prevalência de anemia ferropriva em adolescentes da "Vila Princesa" - lixão em Porto Velho - RO

    OpenAIRE

    França, Maria das Graças Guedes de

    2006-01-01

    As anemias nutricionais resultam da carência simples ou combinada de nutrientes como ferro, o acido fólico e a vitamina B12, podendo também ser causadas por outros fatores mais raros como a deficiência de piridoxina, riboflavina e proteína. Apesar de muitos nutrientes e co-fatores estarem envolvidos na manutenção da síntese normal de hemoglobina, a deficiência de ferro é a causa mais comum de anemia carencial no mundo, constituindo-se a carência nutricional de maior abrangência, afetando prin...

  16. Determinación y diferenciación de Pantoea agglomerans y patógenos por medio de perfiles de ácidos grasos a partir de aislamientos de 5 variedades de semillas de Allium cepa L.

    OpenAIRE

    Rafael Mallaupoma, Zeny C.

    2007-01-01

    Por medio de metil acido esteres (FAMES), fueron analizados 382 aislamientos pertenecientes a cinco variedades de semillas de Allium cepa L. (S1, S2,S3,S4,S5). Se determino que el 20% afecta a cultivos de interés económico, el 36% pertenecen a patógenos que afectan humanos, el 4% afectan a animales y el 40% son del ambiente. A los aislamientos se les identifico por medio de perfiles de ácidos grasos usando un cromatógrafo HP 5890 serie II y una columna capilar agilent ultra 2, software MIDI ,...

  17. Soil decontamination at the Montevecchio-Levante mine site with experimental washing and leaching techniques

    Energy Technology Data Exchange (ETDEWEB)

    Dessi, R. [Progemisa SpA, Cagliari (Italy); Fadda, S.; Peretti, R.; Zucca, A. [CSGM, Centro Studi Germinerari e Mineralurgici del CNR, Cagliari (Italy); Serci, A. [Digita, Dipt. di Geoingegneria e Tecnologie Ambientali, Cagliari (Italy)

    2000-12-01

    The soils in the neighbourhood of the Rio Montevecchio-Sitzerri, a stream that flows in the valley below the tailings pond of the Montevecchio-Levante mineral processing plant (SW Sardinia, Italy) are severely contaminated by heavy metals, to the extent that traditional land uses are compromised. Consequently urgent measures are needed both to abate the pollution at source and rehabilitate the contaminated land. This paper is concerned with the problem of soil decontamination using washing and leaching techniques. Laboratory experiments have been conducted in mechanically agitated reactors, using citric acid and acetic acid solutions and brine of hydrochloric acid and calcium chloride. The influence of both reagent concentration and solid-to-liquid ratio has been assessed, and in the most significant cases, the attack kinetics has been determined. The tests showed the brine to be the most effective for removing metals from the soils. Based on the findings of the investigations, the possibility of decontamination by heap leaching has been simulated in the laboratory using the column technique. [Italian] I suoi circostanti il Rio Montevecchio-Sitzerri, che scorre a valle del bacino di decantazione degli sterili dell'impianto di trattamento dei minerali di Montevecchio-Levante (Sardegna Centro-Occidentale), sono caratterizzati da un elevato contenuto di metalli pesanti, che ne pregiudicano gli usi tradizionali. Si rende percio' improrogabile sia la necessita' di intervenire sulle cause all'origine della contaminazione, sia di bonificare i suoli in questione al fine di recuperarli a nuovi usi. La memoria intende portare un contributo alle relative problematiche affrontando la possibilita' di decontaminazione mediante tecniche di lavaggio e lisciviazione. La sperimentazione di laboratorio e' stata condotta in reattori ad agitazione meccanica, utilizzando soluzioni con acido citrico, acido acetico ed una salamoia costituita da acido

  18. Estudio espectroscópico y teórico del ácido valproico y algunos compuestos derivados con actividad antiepiléptica

    OpenAIRE

    Comelli, Nieves Carolina

    2010-01-01

    Con base en nuestro supuesto acerca de que variaciones en la actividad anticonvulsiva de Suvpd, Chvpd, Etvpd, Dmvpd, Vpd, Ipvpd, Vpa, Prvpa podrían ser explicadas a partir del estudio de los efectos del sustituyente acilo (R2) y del solvente sobre las propiedades electrónicas del grupo O=C-O/N, en este trabajo de tesis doctoral se propone estudiar, usando herramientas experimentales y computacionales, la hipersuperficie de energía potencial del Acido Valproico (Vpa) y derivados funcionales co...

  19. [Simultaneous pulmonar, laryngeal and lingual affectation by Mycobacterium tuberculosis].

    Science.gov (United States)

    Díaz Manzano, J A; Castillo Romero, J L; Padilla Romero, M J; Sánchez Laínez, J J; Castillo Aguilar, C; Cegarra Navarro, M F

    2007-01-01

    The incidence of tuberculosis has lately increased in developed countries. The most frequent affectation is the pulmonar one and in the ORL area the laryngeal. The lingual affectation is exceptional. We present a case of a man 39 years old, with bilateral pulmonar, left vocal cord and mobile tongue affectation, negative Mantoux, positive spit culture and presence of acido-alcohol resistent bacillus in lingual and laryngeal biopsies. After antituberculosis treatment during 6 months the laryngeal and lingual lesions disappeared. We have only found two cases published of simultaneous tuberculosis in these three localisations in the last 30 years.

  20. Intoxicación por fluoroacetato de sodio

    OpenAIRE

    2014-01-01

    El fluoroacetato de sodio es conocido como compuesto 1080, fue descubierto por químicos alemanes durante la segunda guerra mundial. Es un compuesto inodoro e insaboro, soluble en agua, la dosis letal 50 en humanos es de 2 a 4 mg/kg. Debido a su letalidad, ha sido retirado del mercado en algunos países incluyendo Colombia. Este compuesto causa efectos bioquímicos y fisiológicos como acumulación de citrato, alteración de los trasportadores mitocondriales del citrato, acumulación de acido láctic...

  1. Development and characterization of cellulose acetate nanofibers for controlled release of drugs

    OpenAIRE

    Silvia Vaz Guerra Nista

    2012-01-01

    Resumo: Este projeto foi desenvolvido em duas fases, usando a tecnologia de eletrofiação. A primeira fase foi dedicada a obtenção de membranas eletrofiadas com acetato de celulose, as quais formaram nanofibras que foram carregadas com Sulfato de gentamicina, na segunda fase, para estudos da liberação controlada deste fármaco. Na primeira fase as membranas de nanofibras de Acetato de Celulose, chamadas de nanomembranas, foram produzidas utilizando-se quatro misturas de solventes (Acido Acético...

  2. Disease: H00429 [KEGG MEDICUS

    Lifescience Database Archive (English)

    Full Text Available H00429 Proximal renal tubular acidosis (RTA type 2) Renal tubular acidosis (RTA) is... characterized by metabolic acidosis, a severe disturbance of extracellular pH homeostasis, due to renal imp...4278 PMID:11045400 (gene) Rodriguez-Soriano J New insights into the pathogenesis of renal tubular acidosis--...from functional to molecular studies. Pediatr Nephrol 14:1121-36 (2000) PMID:17557941 (gene) Fry AC, Karet FE Inherited renal acidos...(gene, env_factor, marker) Rodriguez Soriano J Renal tubular acidosis: the clinical entity. J Am Soc Nephrol

  3. Disease: H00428 [KEGG MEDICUS

    Lifescience Database Archive (English)

    Full Text Available H00428 Distal renal tubular acidosis (RTA type 1) Renal tubular acidosis (RTA) is c...haracterized by metabolic acidosis, a severe disturbance of extracellular pH homeostasis, due to renal impai...a DM, Oliveira EA, Silva AC Molecular pathophysiology of renal tubular acidosis. Curr Genomics 10:51-9 (2009...) PMID:11045400 (gene) Rodriguez-Soriano J New insights into the pathogenesis of renal tubular acidos...1 (gene) Fry AC, Karet FE Inherited renal acidoses. Physiology (Bethesda) 22:202-11 (2007) PMID:12138150 (ge

  4. Temas de bioquímica básica (DIAPOSITIVAS)

    OpenAIRE

    Correa Quiroz, Jorge Alberto

    2003-01-01

    A continuación se da a conocer el trabajo preparado y organizado por el docente Jorge Alberto Correa Quiroz durante el periodo de su año sabático, los temas a exponer son: Metabolismo y bioenergética, Metabolismo de carbohidratos, Ciclo del acido cítrico y del glioxilato, Transporte de electrones y fosforilación oxidativa, Metabolismo de lípidos y ácidos grasos, metabolismos del amoniaco y compuestos nitrogenados, Fotosíntesis. / Abstract. Then we explain the work planned and organized by...

  5. Avaliação de seis testes sorológicos no diagnóstico da brucelose bubalina

    Directory of Open Access Journals (Sweden)

    Molnár László

    2002-01-01

    Full Text Available Foram examinados 440 soros bubalinos, selecionados em um outro exame de cerca de 1200 amostras sangüíneas. Utilizaram-se seis diferentes testes sorológicos para o exame dessas amostras: dois de aglutinação, dois de ELISA indireto e dois de ELISA competitivo. Os animais positivos no ELISA competitivo da FAO/IAEA foram considerados como infectados, e a comparação com os resultados dos outros testes aconteceu neste sentido. A sensibilidade relativa foi de 100%, 98,57%, 97,14%, 91,42% e 79,28%, e a especificidade relativa de 99,33%, 97,33%, 95,66%, 94,00% e 86,33% nas provas de ELISA competitivo, ELISA indireto com conjugado antibovino de cadeia leve (anticorpo monoclonal com HRPO, ELISA indireto com conjugado contra IgG bovino total, teste do antígeno acidificado tamponado e aglutinação rápida, respectivamente. Discute-se o valor dos diferentes testes sorológicos no diagnóstico da brucelose.

  6. First principle study of the surface reactivity of layered lithium oxides LiMO2 (M = Ni, Mn, Co)

    Science.gov (United States)

    Vallverdu, Germain; Minvielle, Marie; Andreu, Nathalie; Gonbeau, Danielle; Baraille, Isabelle

    2016-07-01

    LiNixMnyCo1 - x - yO2 compounds (NMC) are layered oxides widely used in commercial lithium-ion batteries at the positive electrode. Nevertheless surface reactivity of this material is still not well known. As a first step, based on first principle calculations, this study deals with the electronic properties and the surface reactivity of LiMO2 (M = Co, Ni, Mn) compounds, considering the behavior of each transition metal separately in the same R 3 ̅ mα-NaFeO2-type structure, the one of LiCoO2 and NMC. For each compound, after a brief description of the bare slab electronic properties, we explored the acido-basic and redox properties of the (110) and (104) surfaces by considering the adsorption of a gaseous probe. The chemisorption of SO2 produces both sulfite or sulfate species associated respectively to an acido-basic or a reduction process. These processes are localized on the transition metals of the first two layers of the surface. Although sulfate species are globally favored, a different behavior is obtained depending on both the surface and the transition metal considered. We conclude with a simple scheme which describes the reduction processes on the both surfaces in terms of formal oxidation degrees of transition metals.

  7. Determinação de ferro (III em produtos farmacêuticos por titulação fotométrica = Determination of iron (III in pharmaceutical products by photometric titration

    Directory of Open Access Journals (Sweden)

    Airton Vicente Pereira

    2011-01-01

    Full Text Available Este trabalho descreve a montagem de um sistema de titulacao fotometrica simples e de baixo custo para a determinacao de ferro (III em produtos farmaceuticos. O sistema de titulacao fotometrica foi construido utilizando-se a bomba peristaltica de um espectrofotometro convencional. O procedimento e baseado na titulacao de ferro (III com EDTA e acido salicilico como indicador. A absorcao do complexo ferro (III-acido salicilico foi monitorada espectrofotometricamente em 525 nm. O limite de quantificacao foi de 5 ƒÝg de ferro (III. O procedimento de titulacao fotometrica foi aplicado para a determinacao de ferro (III em amostras contendo sulfato ferroso e hidroxido ferrico polimaltosado. O procedimento mostrou sensibilidade, reprodutibilidade e precisao para a utilizacao em analise rotineira de ferro (III em produtos farmaceuticos.This paper describes a simple, precise and low-cost photometrictitration method for iron (III determination in pharmaceutical preparations. The photometric titration system was constructed using the peristaltic pump of a conventional spectrophotometer. The method is based on titration of iron (III with EDTA using salicylic acid as indicator. The absorption of the iron (III-salicylic acid complex wasmonitored spectrophotometrically at 525 nm. The limit of quantification was 5 ƒÝg of iron (III. The photometric titration procedure was applied for the determination of iron (III in samples of ferrous sulfate and ferric hydroxide polymaltose complex. The procedure showed sensibility, reproducibility and accuracy for use as a method for the routine analysis of iron (III in pharmaceutical formulations.

  8. [Aetiology and treatment of epilepsy in a series of 1,557 patients].

    Science.gov (United States)

    Torres-Ferrús, Marta; Toledo, Manuel; González-Cuevas, Montserrat; Seró-Ballesteros, Laia; Santamarina, Esteban; Raspall-Chaure, Miquel; Sueiras-Gil, María; Cambrodí-Masip, Roser; Sarria, Silvana; Álvarez-Sabín, José; Salas-Puig, Javier

    2013-10-01

    Introduccion. La etiologia de la epilepsia es un determinante importante del tratamiento y el pronostico. Los avances diagnosticos y terapeuticos hacen pensar que la distribucion causal, el tratamiento y el pronostico de la poblacion con epilepsia se hayan podido ver modificados. Objetivo. Describir la distribucion sindromica, etiologica y el tratamiento farmacologico en los pacientes con epilepsia. Pacientes y metodos. Estudio descriptivo transversal de pacientes con epilepsia atendidos de manera consecutiva en la consulta de nuestra unidad de epilepsia. Se recogieron datos demograficos, de sindrome, etiologia y tratamiento farmacologico en el momento de la inclusion. Se analizaron los datos de modo conjunto y por grupos de edad. Resultados. Se incluyeron 1.557 pacientes, el 54% varones. El 73% de la muestra tenia una epilepsia focal, que era secundaria a una lesion estructural en el 56%. Las epilepsias generalizadas representaron el 20%. El 5% fue inclasificable. Por edad, la etiologia vascular predominaba en practicamente todos los grupos y su prevalencia aumentaba en relacion con la edad. Los farmacos antiepilepticos mas utilizados fueron acido valproico (29%), levetiracetam (27%) y carbamacepina (20%). El 70% de las epilepsias generalizadas y el 57% de las focales seguian tratamiento en monoterapia. Conclusiones. La prevalencia por grupos de edad fue similar a la descrita en paises desarrollados aunque se observo una menor prevalencia de epilepsias criptogenicas. Mas del 60% de los pacientes seguia monoterapia y el acido valproico fue el mas utilizado.

  9. Fatty acids composition of fruits of selected Central European sedges (Carex L. Cyperaceae

    Directory of Open Access Journals (Sweden)

    Janyszek, Magdalena

    2010-06-01

    Full Text Available Fatty acids in the fruits of 13 sedge species (Carex L., Cyperaceae were analyzed. The oil contents in the fruits of the studied sedges ranged from 3.73 and 46.52%. In the studied fruit oils 14 different fatty acids were identified. The main unsaturated fatty acids were: linoleic, α-linolenic, oleic, oleopalmitic n-7; oleopalmitic n-9, octadecenic, and eicosenoic acids. The following acids were found in the greatest quantities: linoleic, oleic, α-linolenic and palmitic acids. Based on the fatty acid composition, studied taxa can be divided in two groups. The first group (C. flava, C. pseudocyperus, C. riparia, C. leporina is a very good source of linoleic acid. The second group, including the remaining species, is a good source of α-linolenic acid. The highest oleic acid contents were observed in C. vulpina. The studied material has shown a low concentration of saturated fatty acids, among which palmitic acid was the main one.Results of the analyses allow for the inclusion of the studied species among plants whose fruits are characterized by a high content of unsaturated fatty acids.Los ácidos grasos de frutos de 13 especies de juncos (Carex L., Cyperaceae fueron analizados. El contenido de aceite en los frutos de juncos estudiados vario desde un 3.73 a un 46.52%. En los aceites de los frutos estudiados fueron identificados 14 ácidos grasos diferentes. Los principales ácidos grasos insaturados fueron los ácidos linoleico, α-linolenico, oleico, n-7 palmitoleico, n-9 palmitoleico, octadecenoico y eicosanoico. Los siguientes ácidos grasos fueron encontrados en mayor cantidad: ácido linoleico, ácido oleico, ácido α-linolenico, y ácido palmítico. Basado en la composición de ácidos grasos, las especies estudiadas pueden ser divididas en dos grupos. El primer grupo (C. flava, C. pseudocyperus, C. riparia, C. leporina es una muy buena fuente de ácido linoleico. El segundo grupo, que incluye las especies restantes, es una buena fuente

  10. Ação do estrôgeno na uretra de meninas

    Directory of Open Access Journals (Sweden)

    Boscollo Adriana CP

    2000-01-01

    Full Text Available As infecções recorrentes do trato urinário inferior (ITU em meninas apresentam um grande número de causas etiológicas. Entretanto tem situações em que não se consegue detectar uma causa. Uma dessas seria o nível de estrógeno baixo. Assim foi objetivo do presente trabalho verificar a ação do estrógeno conjugado tópico em 12 crianças com ITUs de repetição. Dessas 12 meninas 10 tinham a urografia excretora e a uretrocistografia miccional normais e 2 apresentavam refluxo vésico-ureteral e uma delas pielonefrite crônica com disfunção vésico-uretral. O estrógeno tópico foi usado na vulva durante 30 dias, tendo sido medidos os níveis plasmáticos pré e pós-tratamento. Os exames de urina cultura e sedimento urinário também foram solicitados pré e pós-tratamento. Todas as crianças com ITU foram tratadas com antimicrobianos antes do uso do estrógeno conjugado. As crianças foram seguidas por um período de até 4 anos com culturas de urina semanais por 3 meses e depois mensais. Resultados: Onze das 12 meninas ficaram livres de infecções e tiveram suas culturas de urina negativas. Uma persistiu com bacteriúria assintomática por todo o período de seguimento. Nenhuma delas necessitou de antimicrobiano profilático. Ocorreu aumento do calibre anatômico da uretra após o tratamento e a avaliação estatística pelo teste t mostrou nível de significância com p< 0,001 Conclusões: Esses achados sugerem que o estrógeno conjugado de uso tópico pode agir de forma a aumentar a resistência uretral às bactérias, como também promover o aumento do calibre uretral e melhorar a dinâmica miccional Esses resultados necessitam de confirmação através de estudos com número maior de crianças.

  11. Estudo comparativo do perfil de ácidos graxos em semente de Passifloras nativas do cerrado brasileiro A comparative study of fatty acids profile of Passiflora seed from Brazilian savana

    Directory of Open Access Journals (Sweden)

    Renata Miranda Lopes

    2010-06-01

    Full Text Available No mundo, existem mais de 580 espécies de maracujazeiros, grande parte nativa da América Tropical e Subtropical, principalmente no Brasil. Os programas de melhoramento utilizam uma parte pequena dos recursos genéticos disponíveis, já que o potencial deste material geralmente não está suficientemente caracterizado. O objetivo deste trabalho foi a caracterização do teor de lipídios e do perfil de ácidos graxos presentes nas sementes de 03 espécies nativas silvestres de maracujás (Passiflora cincinnata, P. setacea e P. nitida, empregando o maracujá comercial (P.edulis como referência. Os lipídios totais foram extraídos com éter de petróleo em extrator tipo Soxhlet. O perfil dos ésteres metílicos foi caracterizado por cromatografia a gás, usando detector de ionização de chama. A espécie P. setacea apresentou o maior teor de óleo (31,2-33,5%, seguida por P. nitida (29,5-32,3% e P. cincinnata (16,7-19,2%. O óleo de P. setacea apresentou 64,7% de ácido linoleico, 19,7% de oleico e 10,2% de ácido palmítico; o óleo de P. nitida apresentou os ácidos mirístico (0,6%, palmítico (15,3%, palmitoleico (2,0%, oleico (24,8%, linoleico (51,7% e um ácido graxo incomum às outras espécies de Passiflora, o láurico (0.4%; já o óleo de P. cincinnata apresentou os ácidos oleico (11,0%, palmítico (10,2% e linoleico (74,3%. O ácido linoleico foi predominante nas três espécies estudadas. Todas as espécies apresentaram ácido vacênico (0,3-0,6%, descrito pela primeira vez no gênero Passiflora.There are more 580 species of passion fruit in world, majority native from America Tropical and Subtropical, especially Brazil. Breeding programs use small part of genetic resources available, because potential of this material is not sufficiently characterized. The objective of this work was the characterization of lipids content and fatty acids profile present in the seeds of 03 species of wild native passion fruit (Passiflora

  12. Fatty acid composition of Achene oils from five Moroccan climatic cultivars of Cannabis.

    Directory of Open Access Journals (Sweden)

    Merzouki, A.

    1997-06-01

    Full Text Available The fatty acid composition of achene oil from five Cannabis climatic cultivars cultivated in the nort of Morrocco is determined. Linoleic acid predominated (40 to 45%, followed by linolenic (12 to 17% and oleic (7 to 10% acids. Differences in the fatty acid composition of oils are attributed to environmental factors.

    Se estudia la composición en ácidos grasos del aceite de los aquenios de cinco variedades climáticas del cáñamo (Cannabis sativa L cultivadas en el norte de Marruecos. Predomina el ácido linoleico (40 a 45% seguido por el linolénico (12 a 17% y el oleico (7 a 10%. Las diferencias en la composición de los ácidos grasos del aceite se atribuyen a factores ambientales.

  13. Physical and chemical analysis and fatty acid composition of peanut, peanut oil and peanut butter from ÇOM and NC-7 cultivars

    Directory of Open Access Journals (Sweden)

    Seven, Serap

    2003-03-01

    óxido, la densidad relativa, el índice de refracción, los tocoferoles, el índice de saponificación y la materia insaponificable. Por cromatografía de gases se ha determinado en las semillas y en los aceites de manteca de ambas plantaciones los ácidos: mirístico, palmítico, palmitoléico, esteárico, oleico, linoleico, linolénico, araquídico, gadoléico y behénico. Los ácidos grasos mayoritarios de las mantecas y semillas de cacahuetes en las dos variedades fueron los ácidos oleico, linoleico y palmítico. Ambas variedades mostraron altas concentraciones de ácido oleico. Por consiguiente, las mantecas y semillas de cacahuetes de ÇOM y NC-7 aparecen ricas en aceite, proteína, ácidos oleico y linoleico y minerales. El aumento de la relación alto oleico/linoleico y del contenido en tocoferoles es muy importante debido a la estabilidad del aceite. También, la manteca de cacahuete es equivalente nutricionalmente al grano de cacahuete.

  14. Fatty acid composition of Brunfelsia uniflora (Solanaceae seed oil

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    Guzmán, C. A.

    1995-04-01

    Full Text Available The seeds of Brunfelsia uniflora contained 30.5% of oil. The oil was analysed and components were identified by infrared (IR, gas chromatography-mass spectrometry (GC-MS and chemical methods. Linoleic acid predominated (75.5% followed by oleic (11.8% and palmitic (7.25% acids. Ricinoleic acid was present in small quantities (0.52%.Las semillas de Brunfelsia uniflora contuvieron 30.5% de aceite. El aceite fue analizado y los componentes fueron indentificados por espectroscopia de infrarrojo (IR, cromatografía gaseosa-espectrometría de masa (CGEM y métodos químicos. Predominó el ácido linoleico (75.5% seguido por el oleico (11.8% y el palmítico (7.25%. El ácido ricinoleico estuvo presente en pequeñas cantidades (0.52%.

  15. Estudio del contenido de ácidos grasos superiores en veinte variedades tropicales de soya

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    Boris Kocelj Ramírez

    2009-05-01

    Full Text Available Muy poco se sabe acerca del contenido de ácidos grasos en las diferentes variedades tropicales de soya. En este trabajo se estudiaron veinte variedades tropicales de soya en lo referente a su contenido de aceite y en ácidos grasos. Se determinaros las propiedades físicas y químicas del aceite que lo caracteizan como comestible. El contenido cualitativo y cuantitativo de ácidos grasos individuales se investigó utilizando la técnica de cromatografía de gases. Se analizaron los éteres correspondientes, obtenidos por esterificación catalítica completa con trifluoruro de Boro-metanol. Se encontraron diferencias significativas entre las propiedades de los aceites de las variedades estudiadas. Se identificaron los ácidos: palmítico, esteárico, linoleico y linolénico

  16. Evaluación de la actividad tóxica y antifúngica del extracto etéreo de la corteza de Celtis trinervia Lam (Ulmaceae

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    Torrenegra R. D.

    2000-12-01

    Full Text Available

    A la fracción evaluada biológicarnente se encontró actividad toxica sobre Artemia salina mostrando una CL50 de 430 ppm y antifúngicas contra Fusarium oxysporum ssp dianthi en donde mostro CL50 de 0.25 mg/mL. La fracción evaluada del extracto etéreo de la corteza del rallo de Celtis trinervia Lam. Se identificaron sustancias de tipo terpénicas como santaleno, además se identificaron ácidos grasos saturados e insaturados de interés biológico, como el linoleico y oleico. Los compuestos aislados se identificaron can métodos físicos. químicos y espectroscópicos.

  17. Capacidade antioxidante da própolis

    OpenAIRE

    2014-01-01

    A própolis é uma substância resinosa coletada de diversas partes das plantas por abelhas e misturada à cera, pólen e secreções salivares. Sua composição é complexa e está relacionada, principalmente, às características da vegetação de cada região. Trinta e três amostras de própolis foram coletadas em quatro regiões brasileiras (Nordeste, Sudeste, Sul e Centro-Oeste) e analisadas quanto à sua capacidade antioxidante, pela oxidação acoplada do sistema β-caroteno/ácido linoleico. Variação s...

  18. Chemical composition of aboriginal peanut (Arachis hypogaea L. seeds from Uruguay.

    Directory of Open Access Journals (Sweden)

    Grosso, Nelson R.

    1999-06-01

    Full Text Available Oil, protein, carbohydrate and ash contents, iodine value, and fatty acid and sterol compositions were studied in seed of 9 aboriginal (Arachis hypogaea subsp. fastigiata var. vulgaris cultivars originating from Uruguay. They showed a high protein level as other varieties of the subspecie fastigiata (these protein percentages are higher than varieties of subspecie (hypogaea . Palmitic (16:0, stearic (18:0, oleic (18:1, linoleic (18:2, arachidic (20:0, eicosenoic (20:1, behenic (22:0, and lignoceric (24:0 acids were detected. The cultivar 7 Uv showed higher oleic acid content (42.53% and 0/L ratio (1.09. The cultivars 2 Uv and 5 Uv had higher percentage in linoleic acid (43.67% and 43.40%, respectively. The cultivar 3 Uv and 4 Uv exhibited lower iodine value (104.90 and 104.73, respectively. Cholesterol, campesterol, stigmasterol, β-sitosterol, Δ5-avenasterol, Δ7-estigmasteroI and Δ7-avenasterol were detected in the sterols, β-sitosterol was the most abundant. Significant difference was only found for stigmasterol. The chemical quality of these seeds is characterized by higher protein levels and oils with lower O/L ratio and higher iodine value.

    Se han estudiado los contenidos en aceite, proteína, hidrato de carbono y ceniza, índice de yodo y composición en ácidos grasos y esteroles en semillas de 9 cultivares aborígenes (Arachis hypogaea subsp. fastigiata var. vulgaris originarios de Uruguay. Estos mostraron un nivel alto en proteína como las otras variedades de la subespecie fastigiata (estos porcentajes en proteína son mayores que en las variedades de la subespecie (hypogaea . Se detectaron los ácidos palmítico (16:0, esteárico (18:0, oleico (18:1, linoleico (18:2, araquídico (20:0, eicosenoico (20:1, behénico (22:0 y lignocérico (24:0. El cultivar 7 Uv mostró el mayor contenido en ácido oleico (42. 53% y en la relación oleico/linoleico

  19. Synthesis and characterization of magnetic nanoparticles of oxides for dual MnFe{sub 2}O{sub 4} bioseparation, stabilized in fatty acid and the system chitosan - Eu(TTA){sub 3}(TPPO){sub 2}. Studies on the influence of doping with Gd{sup 3+}, Tb{sup 3+}, Ho{sup 3+} e Eu{sup 3+} in structural and magnetic properties; Sintese e caracterizacao de nanoparticulas magneticas de oxidos duplos de MnFe{sub 2}O{sub 4} para biosseparacao, estabilizadas em acido graxo e recobertas pelo sistema quitosana - Eu(TTA){sub 3}(TPPO){sub 2}. Estudo da influencia da dopagem com Gd{sup 3+}, Tb{sup 3+}, Ho{sup 3+} e Eu{sup 3+} nas propriedades estruturais e magneticas

    Energy Technology Data Exchange (ETDEWEB)

    Kovacs, Thelma Antunes Rodrigues

    2014-07-01

    This work was synthesized and characterized ferrite magnetic nanoparticles manganese, using the chemical coprecipitation method. By varying the heating time under 98°C (0, 10,20,40,60 3 80 minutes), the molar percentage of doping (1, 3, 5, 7, and 10%), gadolinium, europium, terbium and holmium. Magnetic ferrite nanoparticles and manganese ferrite doped with manganese were synthesized by coprecipitation method starting with chloride solutions of metals (iron (III), manganese (II), europium (III), gadolinium (III), terbium (III) and holmium (III)) and NaOH 5mol.L{sup -1} as precipitating agent. The magnetic nanoparticles were characterized by scanning electron microscopy, infrared spectroscopy, X-ray diffraction, magnetization curves, and thermal analysis. Most of manganese ferrite particles showed superparamagnetic behavior. After the characterization it was found that the samples synthesized manganese ferrite with more than 40 minutes heating time, crystal structure showed the characteristic pattern of the inverted manganese ferrite spinel type. The stabilization of the samples in oleic acid nanoparticles produced with a hydrophobic outer layer and facilitated by coating chitosan biopolymer, since this has a positive charge. Among the doped samples there was no significant change in the magnetic behavior. Several techniques for characterizing these materials have been used such as X-ray diffraction spectrum in the infrared region, magnetization curves and thermal analysis. The resins were tested as magnetic material for the separation of biological materials. In this paper, are used as biological targets separation of bovine serum albumin. (author)

  20. Estudio analítico de la composición en ácidos grasos de mostaza y salsas de mostaza.

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    López Argüello, E.

    1999-12-01

    Full Text Available In order to characterise mustard (whole seed or flour, mustard sauces with grain and mustard sauces in relation to their base seed, the concentrations of fatty acid were determinated by gas chromatography (GC. Erucic acid was the most abundant fatty acid component in mustard and mustard sauces (27,7 % and 24,6 % of total fatty acid content, followed by oleic acid (20,0 % and 21,1 % and linolenic acid (16,3 % and 16.2%. The major acid in mustard sauces with grain was linolenic (21,4 %, followed by linoleic acid (20,3 % and oleic acid (19,3 %. By means of correlation and discriminant analysis the samples have been grouped and classified. It is shown that fatty acid are usefull parameters for quality control analysis of mustard sauces.

    Se determinaron, por cromatografía gaseosa, el perfil de los ácidos grasos en mostaza (semilla y harina, salsas de mostaza con grano y salsas finas de mostaza con el objeto de caracterizarlas en relación con la semilla base. El ácido erúcico fue el más abundante en la mostaza y en las salsas finas (27,7 % y 24,6 % del contenido total de ácidos grasos, seguido de los ácidos oleico (20,0 % y 21,1 % y linoleico (16,3 y 16.2 %. En las salsas de mostaza con grano el ácido graso mayoritario fue el linolénico (21,4 % seguido de los ácidos linoleico (20,3 % y oleico (19,3 %. Mediante los análisis de correlación y discriminante las muestras son agrupadas y clasificadas. Los ácidos grasos han demostrado ser parámetros válidos para el análisis del control de calidad de las salsas de mostaza.

  1. Phenolic compounds and antioxidant activity of Pecan [Carya illinoinensis (Wangenh. C. Koch] kernel cake extracts obtained by sequential extraction

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    Block, Jane Mara

    2009-12-01

    Full Text Available The total phenolic and condensed tannin contents of different Pecan kernel cake extracts (ether, acetone, alcohol and distilled water were estimated and their antioxidant activities were evaluated through ABTS, DPPH and ß-carotene/linoleic acid systems. Color variations of the Pecan kernel cake were determined through an instrumental analysis using the CIE Lab system. Significantly higher levels (p El contenido de taninos condensado y fenoles totales de diferentes extractos de tortas de almendra de pecana (éter, acetona, alcohol y agua destilada fueron estimados y sus actividades antioxidantes fueron evaluadas mediantes los métodos con ABTS, DPPH y el sistema ß-caroteno/ácido linoleico. Las variaciones de color de la torta de almendra de pecana fueron determinadas mediante análisis instrumental usando el sistema CIE Lab. Los contenidos de fenoles totales, taninos condensados y actividad antioxidante, medida mediante los métodos con ABTS Y DPPH (30 min y 24 h, fueron significativamente más altos (p < 0.05 con el extracto de acetona (16.4 mg GAE/g; 31.2 mg CE/g; 235.3 μmol TEAC/g and 68.6 and 100.3 mg TEAC/g, respectivamente. El porcentaje de inhibición de la oxidación en el sistema ß-caroteno/ ácido linoleico vario desde 37.9 a 93.1% con el extracto de acetona a 300 ppm, mostrando resultados significativamente superiores. Las muestras con una mayor tendencia a tonos rojos presento los niveles más altos de taninos condensados.

  2. Fatty acid composition of cane molasses and yeasts Composição em ácidos graxos de melaço de cana-de-açúcar e de leveduras

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    L.E. Gutierrez

    1993-12-01

    Full Text Available Lipid extract and fatty acid composition of cane molasses and yeasts (Saccharomyces cerevisiae M-300-A and Saccharomyces uvarum IZ-1904 grown in molasses medium were determined. In molasses, linoleic acid was found in higher levels (around 42% and was followed by palmitic, oleic and linolenic acids. The lipid extract varied from 1.02 to 3.13 gkg-1. In yeasts, the level of lipid extract varied from 16.65 to 31.12 g.kg-1 (dry matter basis depending on the molasses type and yeast species. Both yeasts were able to incorporate fatty acids from molasses' and therefore linoleic and palmitic acids were the major fatty acids found in them.Foram determinados o extrato lipídico e a composição em ácidos graxos de melaço de cana-de-açúcar e das leveduras (Saccharomyces cerevisiae M-300-A e Saccharomyces uvarum Iz-1904 multiplicadas em meio fermentativo de melaço. Nos melaços, o ácido linoleico foi encontrado em maiores quantidades (cerca de 42% do total e foi seguido pelos ácidos palmitic o, oleico e linolênico. O extrato lipídico variou de 1,02 até 3,13 g.Kg-1. Em leveduras, o nível do extrato lipídico variou de 16,65 até 31,12 g.kg-1(com base na matéria seca e foi afetado pelo tipo de melaço e da espécie de levedura. Ambas as leveduras foram capazes de incorporar ácidos graxos presentes no melaço e portanto os ácidos linoleico e palmítico foram os principais ácidos graxos encontrados nessas leveduras.

  3. Assessment of lipoxygenase activity in seed extracts from 35 plant species

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    Fauconnier, M. L.

    1995-02-01

    Full Text Available Lipoxygenase activity in 35 seed extracts was determined on the basis of hydroperoxide synthesis using linoleic acid as substrate. The results referring to the extracted protein content show that several species of Vigna (V. unguiculata, V. radiata and V. mungo and one of Trifolium exhibit stronger lipoxygenase activity than soybean enzyme extracts. The pH activity relationship was also established for 4 very active samples. GC-MS analysis revealed equal amounts of 9- and 13- hydroperoxides of linoleic acid in these seed extracts, indicating no enzyme positional specificity.

    Se ha determinado la actividad lipoxigenasa en 35 extractos de semilla en base a la síntesis de hidroperóxido usando ácido linoleico como sustrato. Los resultados referidos al contenido en proteína extraídos mostraron que varias especies de Vigna (V. unguiculata, V. radiata y V. mungo además de una de Trifolium, exhibieron mayor actividad lipoxigenasa que los extractos enzimáticos de soja. La relación entre la actividad-pH se ha establecido para 4 muestras muy activas. El análisis por GC-MS de estos extractos de semillas, mostró cantidades iguales de los hidroperóxidos 9- y 13 del ácido linoleico indicando la no especificidad posicional de la enzima.

  4. La inmunocromatografía para el diagnóstico de la infección por Taenia solium en Mesocricetus auratus mediante la detección de coproantígenos*

    OpenAIRE

    Hermes Escalante A; Obed Huamanchay C; Kelly Davelois A

    2001-01-01

    Objetivo: Evaluar la técnica de inmunocromatografía para el diagnóstico de la infección por Taenia solium en Mesocricetus auratus "hámsters" mediante la detección de coproantígenos. Materiales y métodos: Se produjo en Oryctolagus cunniculus "conejo" IgG anti-antígenos de excreción/secreción (ES) de T. solium y en Capra hircus "cabra" IgG anti-IgG de conejo. Parte de las IgG anti-antígenos ES de T. solium fue conjugado con oro coloidal. La inmunocromatografía se llevó a cabo utilizando tiras d...

  5. La inmunocromatografia para el diagnótico de la infección por Taenia solium en Mesocricetus auratus mediante la detección de coproantígenos

    OpenAIRE

    Escalante A, Hermes; Facultad de Ciencias Biológicas, Universidad Nacional de Trujillo - Perú; Huamanchay C, Obed; Facultad de Ciencias Biológicas, Universidad Nacional de Trujillo - Perú; Davelois A, Kelly; Centro de Análisis e Investigación Escalabs Trujillo - Perú

    2001-01-01

    Objetivo: Evaluar la técnica de inmunocromatografía para el diagnóstico de la infección por Taenia solium en Mesocricetusauratus “hámsters” mediante la detección de coproantígenos. Materiales y métodos: Se produjo en Oryctolagus cunniculus“conejo” IgG anti-antígenos de excreción/secreción (ES) de T. solium y en Capra hircus “cabra” IgG anti-IgG de conejo.Parte de las IgG anti-antígenos ES de T. solium fue conjugado con oro coloidal. La inmunocromatografía se llevó a caboutilizando tiras de ni...

  6. Inmunodetección por peroxidasa de células de ganglio sensorial infectadas por virus de rabia

    Directory of Open Access Journals (Sweden)

    Jaime E. Castellanos

    1996-09-01

    Full Text Available Con el objetivo de establecer una técnica de inmunocitoquimica por avidina-peroxidasa biotinilada para la detección de células infectadas in vitro por el virus rábico, se usaron cultivos de ganglio de la raíz dorsal de ratón. En este trabajo se presentan los resultados del proceso de estandarización de la inmunoperoxidasa, en la que también se usa el conjugado antirrábico producido en el lnstituto Nacional de Salud. Las diluciones de anticuerpo, que normalmente se usan en la inmunofluorescencia, muestran un excesivo ruido de fondo en la inmunoperoxidasa. Se discuten las posibles razones de este artefacto y se presenta un protocolo para la detección por inmunoperoxidasa de células de ganglio sensorial infectadas in vitro por virus de rabia.

  7. O Brasil e o Conselho de Segurança da Organização das Nações Unidas: dos anos 90 a 2002 Brazil and the UN: struggle for a Role in the Security Council (From the Nineties to the Present Day

    Directory of Open Access Journals (Sweden)

    Virgílio Caixeta Arraes

    2005-12-01

    Full Text Available A obtenção de um assento permanente no Conselho de Segurança da Organização das Nações Unidas tem sido uma aspiração constante da política externa brasileira desde o fim da Guerra Fria. Todavia, a ênfase interna na consecução de tal intento depende do êxito da aplicação da política econômica conjugado com alterações externas, como o atentado terrorista de setembro de 2001.A permanent seat in the United Nations Security Council has been a constant aspiration of the Brazilian foreign policy since the end of the Cold War. However, the domestic emphasis in this endeavour depends on the success of the economic policy in association with international changes, provoked by events such as the September 11th .

  8. PERFIL DE PRODUÇÃO E COMERCIALIZAÇÃO DO ORA-PRO-NOBIS EM DOIS CONTEXTOS REGIONAIS DE MINAS GERAIS: PERSPECTIVAS DE AGREGAÇÃO DE VALOR

    Directory of Open Access Journals (Sweden)

    Maria Regina de Miranda Souza

    2016-12-01

    conteúdo em bandejas de isopor é comercializado por R$ 4,00, em hipermercados de Belo Horizonte. A produção e comercialização de ora-pro-nobis é ainda rudimentar o que dificulta seu estabelecimento como cultura agrícola e produto comercial no contexto avaliado. Os preços praticados, a tradição cultural, o possível aumento de escala, a regularidade de oferta e a apresentação conveniente, em especial o uso de embalagens em saco plástico e bandeja de isopor, agregam valor ao produto proporcionando maior geração de renda. Esses fatores conjugados tornam o ora-pro-nobis uma alternativa atraente de renda e inserção do agricultor familiar no mercado.

  9. Interface dialética e Crítica imanente em Hegel e Adorno

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    Mirian Monteiro Kussumi

    2017-05-01

    Full Text Available Entre os autores da Teoria Crítica frankfurtiana, talvez Adorno seja declaradamente o mais influenciado pela filosofia de Hegel. Coube ao mesmo preservar o sentido de dialética que, reconfigurada, aparece como método essencialmente crítico. Salientar o criticismo da dialética significa, aos olhos de Adorno, entendê-la como essencialmente negativa, algo previsto na sua formulação inicial no contexto do idealismo pós-kantiano. Entretanto, é possível observar tão claramente essa força crítica dentro do próprio Hegel? A resposta a tal questão surge na própria comparação entre os conceitos (Crítica, dialética, negatividade conjugados pelos dois pensadores, algo que buscamos mostrar no presente artigo.

  10. Agricultura y ruralidad europeas frente a la neutralidad presupuestaria y el nuevo marco financiero

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    A. Andúgar Miñarro

    2004-01-01

    Full Text Available La multifuncionalidad de la agricultura y ruralidad europeas parecían haber sido legitimadas en el contexto de las negociaciones agrícolas de la Ronda de Doha y de las demandas crecientes de una sociedad cada día más preocupada por la seguridad de los alimentos, el bienestar de los animales, y la protección del medio, todo ello conjugado en una agricultura sostenible. Sin embargo razones internas de hondo calado en una nueva Unión a veinticinco, como la neutralidad presupuestaria y el nuevo marco fi nanciero, trastocan las vías y tendencias mantenidas hasta ahora. Las repercusiones traslucen una clara reorientación desde las líneas integradas hacia otra competitiva, mercantilista, que podría vislumbrar una vuelta de tuerca hacia enfoques pasados.

  11. Production, characterization and purification of fungal beta-glucosidases and their action in the hydrolys of amygdalin, cellobiose and p-nitrophenyl-beta-glucopiranoside

    OpenAIRE

    Carolina Casagrande Bedani

    2010-01-01

    Resumo: As ß-glicosidases (ß-D-glucosídeo glucohidrolase, EC 3.2.1.21) catalisam a hidrólise de dissacarídeos e glicosídeos conjugados a partir da extremidade não redutora. A enzima ß-glicosidase apresenta inúmeras aplicações na indústria de alimentos e farmacêutica, atuando na hidrólise da celobiose em glicose, no processo de conversão da celulose em glicose em combinação com outras enzimas celulolíticas; na liberação de compostos de aroma em sucos de frutas e vinho; na hidrólise de composto...

  12. Anticuerpos antinucleares, imágenes y características obtenidas por inmunofluorescencia: Importancia de los isotipos IgA, IgM e IgG Antinuclear antibodies, patterns and characteristics obtained by immunofluorescence: The importance of the IgA, IgM and IgG isotypes

    Directory of Open Access Journals (Sweden)

    Miriam Arcavi

    2009-10-01

    Full Text Available La técnica de elección para el screening de anticuerpos antinucleares (ANA es la inmunofluorescencia indirecta que utiliza como sustrato una línea de células epiteliales de carcinoma de laringe humano (IFI-HEp2, y como antisuero, anti-IgG o anti-Ig totales. Los ANA-IgG son los más importantes para el diagnóstico y monitoreo de las enfermedades del tejido conectivo (ETC, mientras los ANA-IgM son de menor relevancia clínica en estos pacientes. Sin embargo, poco se sabe de los ANA-IgA ya que estos Ac han sido menos investigados. El objetivo de este trabajo fue estudiar la prevalencia de los diferentes isotipos de inmunoglobulinas de anticuerpos antinucleares en los pacientes con ETC y evaluar la conveniencia de utilizar conjugados monovalentes o polivalentes. Se procesaron 100 sueros de pacientes con diversas ETC empleando IFI-HEp2, en los cuales se detectó 38% de ANA-IgA (títulos ≥ 1:80 y 12% de ANA-IgM (títulos ≤ 1:160. En 29 casos se detectó IgA en ausencia de IgM, en 3 casos IgM en ausencia de IgA. En todos los casos los ANA-IgG estuvieron presentes. En 6 sueros se observó un cambio de imagen con conjugado anti-IgA y en 3 con conjugado anti-IgM. Debido a la alta prevalencia de ANA-IgA detectada por IFI-HEp2, se destaca la conveniencia de utilizar conjugado anti-Ig totales en lugar de anti-IgG, mientras se desconozca la relevancia de los ANA-IgA en el diagnóstico, pronóstico y seguimiento de las enfermedades reumáticas sistémicas.The indirect immunofluorescence with epitelial cell line from human laryngeal carcinoma as substrate (IIF-HEp2 and anti-IgG or anti-total Ig as antisera, is the technique currently used for the detection of antinuclear antibodies. The most important antibodies for the diagnosis and follow-up of connective tissue diseases (CTD are the IgG-ANA, while the IgM-ANA have no clinical relevance. However the IgA-ANA have not been thoroughly investigated so far. The aim of this work was to study the prevalence

  13. ANTICUERPOS DIRIGIDOS A PEQUEÑAS MOLÉCULAS DE NEUROTRANSMISORES Y PÉPTIDOS: PRODUCCIÓN Y APLICACIÓN DE ANTICUERPOS A DOPAMINA, SEROTONINA, GABA, VASOPRESINA, PÉPTIDO VASOACTIVO INTESTINAL, NEUROPÉPTIDO Y, SOMATOSTATINA Y SUSTANCIA P

    Directory of Open Access Journals (Sweden)

    Ruud M. Buijs

    2009-01-01

    Full Text Available En el presente trabajo se describe un procedimiento por medio del cual pueden ser obtenidos anticuerpos a partir de moléculas pequeñas de neurotransmisores usando glutaraldehido como agente acoplador. Este procedimiento fue desarrollado bajo la condición de que el inmunógeno usado para la preparación del anticuerpo fuera, hasta donde fuese posible, de la misma identidad que la molécula transmisora fijada al tejido. Con el de fin de lograr mayor éxito, los péptidos, aminas o aminoácidos1 fueron conjugados a una proteína acarreadora usando glutaraldehido. Los anticuerpos obtenidos fueron usados en estudios de inmunohistoquímica permitiendo la detección de estos transmisores después de un proceso de fijación con glutaraldehido o paraformaldehido para los péptidos.

  14. Nanopartículas lipídicas sólidas

    OpenAIRE

    Leopoldo Villafuerte R.; Beatriz García F.; María de Lourdes Garzón S.; Alejandra Hernández L.; María Luisa Vázquez R.

    2008-01-01

    las nanopartículas lipídicas fueron desarrolladas como un sistema de transporte alternativo a las emulsiones, liposomas y nanopartículas poliméricas. Se presentan estructuras nanoparticuladas basadas en lípidos sólidos tales como las “nanopartículas lipídicas sólidas” (SLN), “transportadores lipídicos nanoestructurados” (NLC), “nanopartículas recubiertas con lípidos” (LNPs) y los “conjugados de un lípido y un fármaco” (LDC). Se revisan aspectos de la estabilidad física y de caracterización de...

  15. Validación de un ensayo ELISA para la determinación de anticuerpos anti LPS de Vibrio Cholerae

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    Yadira Pino

    2003-03-01

    Full Text Available Para evaluar la respuesta inmunológica de cualquier candidato vacunal es necesario contar en el laboratorio con técnicas estandarizadas y validadas. Es por ello que en este trabajo se realizaron los ensayos para la estandarización del ELISA indirecto, usado para la determinación de anticuerpos séricos anti-LPS Ogawa contra cólera en suero de humanos inoculados por vía oral, así como la evaluación de los parámetros de validación típicos de este ensayo. Para la selección de las condiciones óptimas se evaluaron la concentración de recubrimiento, condiciones de bloqueo y dilución de conjugado, con el objetivo de seleccionar las mejores respuestas para el control positivo, el control negativo y el blanco en cada caso.Una concentración de 25 μg/mL de LPS Ogawa en PBS, como recubrimiento, durante toda la noche; leche descremada al 0,5% en PBS, 30 min a temperatura ambiente como bloqueo y el conjugado anti-IgA-HRP diluido 1:5000, resultaron las variables óptimas para el ensayo. En cuanto a la validación de la técnica los parámetros evaluados fueron precisión, exactitud, límite de detección, especificidad y robustez. Para ello se siguió un protocolo de validación que permitiera evaluarlos, y en todos los casos el ensayo se consideró adecuado, siempre y cuando el coeficiente de variación resultara ser menor del 20%. En todos los parámetros evaluados se cumplió con este requisito, considerando así los resultados confiables y reproducibles.

  16. Stability of rice bran oil extracted by SFE and soxhlet methods during accelerated shelf-life storage

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    Mariod, A.

    2014-03-01

    Full Text Available Supercritical fluid high oryzanol (SFE HO and supercritical fluid low oryzanol (SFE LO rice bran oils were obtained and compared with that extracted by the Soxhlet (SOX method. Their composition and stability during storage were determined. The amount of unsaponifiable matter and gamma oryzanol of SFE samples were significantly (p -1 was higher than that reported in SFE HO and SFE LO, at 3.2 and 2.6 mg·g-1, respectively. After storage for 42 days at 70 °C the PV, FFA%, conjugated diene and p-anisidine values of SOX were higher than those of SFE HO, and SFE LO. The SFE samples showed better stability than SOX under successive heating and the addition of BHA decreased PV, FFA%, conjugated diene and p-anisidine levels in all samples.Se realizaron extracciones mediante fluido supercrítico de salvado de arroz con alto (SFE HO y bajo (SFE LO contenido en orizanol y se comparó con los extraídos mediante Soxhlet (SOX. Se determinó la composición y la estabilidad durante el almacenamiento. La materia insaponificable y el gamma orizanol de las muestras SFE fueron significativamente más altas (p -1 fue mayor que lo encontrado para SFE HO y SFE LO, 3,2 y 2,6 mg·g-1 respectivamente. Después de 42 días de almacenamiento a 70 °C los valores de PV, FFA %, dienos conjugados y p-anisidina de SOX fueron mayores que los de SFE HO, y SFE LO. Las muestras SFE mostraron mejor estabilidad que SOX bajo calentamiento y la adición de BHA disminuyó el PV, FFA %, dienos conjugados y los niveles de p-anisidina en todas las muestras.

  17. Determinación de las condiciones de ensayo óptimas en un ELISA para la detección de anticuerpos séricos IgG anti-LPS de Pseudomonas aeruginosa O11

    Directory of Open Access Journals (Sweden)

    Tania Valmaseda

    2004-12-01

    Full Text Available La selección de sueros de donantes sanos para la obtención de una gamma hiperinmune contra la infección por Pseudomona aeruginosa, así como la evaluación de la respuesta inmunológica de cualquier candidato vacunal contra este microorganismo necesita contar en el laboratorio con técnicas estandarizadas. En este trabajo se realizaron los ensayos necesarios para el montaje y la optimización de un ELISA indirecto para la determinación de anticuerpos séricos de clase IgG anti- LPS de P. aeruginosa O11. Se evaluaron la concentración de recubrimiento, condiciones de bloqueo, dilución de trabajo de las muestras a evaluar y del conjugado con el fin de seleccionar en cada caso las mejores respuestas para el control positivo, el control negativo y el blanco del ensayo. Una concentración de 1,5 μg/mL de LPS O11 en PBS toda la noche a 4 °C como recubrimiento, la necesidad de no incluir un paso adicional de bloqueo y el conjugado humano anti IgG-HRP diluido 1:3000, 1 h a 37 °C resultaron las variables óptimas para el ensayo. Por otra parte, se estableció el rango lineal de la curva del control positivo y se seleccionó la dilución de trabajo 1:100 para las muestras de sueros a evaluar.

  18. Estandarización y evaluación de ELISA para el serodiagnóstico de leishmaniasis l. Leishmaniasis cutánea

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    Augusto Corredor

    1995-06-01

    Full Text Available Se evaluó la prueba inmunoenzimática ELlSA para la detección de anticuerpos en pacientes con leishmaniasis cutánea, usando como conjugado anti-lgG humana con fosfatasa alcalina. La concentración óptima de antigeno, extracto de promastigotes de Leishmania, fue 5 pg1rnL y las diluciones óptimas de los sueros tanto reactivos como no reactivos y de conjugado fueron 1:400 y 1:10.000, respectivamente. Se analizaron 163 sueros de pacientes que no habían estado en contacto con el parásito (Leishmania, 31 sueros de pacientes con leishmaniasis cutánea comprobada parasitológicamente y 39 sueros de pacientes con enfermedad de Chagas comprobada serológicamente. Con valores de densidad óptica iguales o mayores de 0,502 la prueba mostró una especificidad del 94,6% y una sensibilidad del 58,1% debido a que los sueros de las personas con enfermedad de Chagas mostraron franca reacción cruzada con el antigeno de Leishmania. Sin embargo, el ELlSA con un punto de corte de 0,314, dado únicamente por los sueros de personas que no habían estado en contacto con el parásito, arroja una sensibilidad y especificidad del 83,9% y 83,2%, respectivamente. Los resultados del estudio sugieren que el ELlSA puede utilizarse en áreas donde la enfermedad de Chagas no sea endémica y las cuales están bien delimitadas en Colombia.

  19. Supported liquid membrane stability in chiral resolution by chemically and physically modified membranes

    Energy Technology Data Exchange (ETDEWEB)

    Molinari, R.; Argurio, P. [Arcavata di Rende Univ. of Calabria, Arcavata di Rende, CS (Italy). Dept. of Chemical and Materials Engineering

    2001-04-01

    In the present work some stability studies on Supported Liquid Membranes (SLMs) to be used for chiral separations were realized. In particular, primary aim was to determine how a modification of the support surface influences the SLM stability. First, the procedure for support modification was optimised, making a screening of various compounds (sulphuric acid, nitric acid, chromic acid, sodium dodecyl sulphate (SDS), glycerol, oleic alcohol, propylene glycol (PPG), bovine serum albumin (BSA)) and testing their performance by means of contact angle measurements. Next, a second screening was realized by permeation tests in a stirred cell. Finally, to compare the stability of modified with unmodified support in a process of interest for chemical and/or biochemical industries, some permeation tests for resolution of DNB-DL-Leucine were realized in a re-circulation system. Results showed a better surface hydrophilization of chemically modified support and better stability of the sulphonated support. However, in operating conditions a little high stability of the unmodified support was obtained. [Italian] Nel presente lavoro sono stati realizzati degli studi di stabilita' di Membrane Liquide Supportate (SLMs) da impiegare in separazioni chirali. In particolare, obiettivo principale e' stato quello di determinare l'influenza che una modifica della superficie del supporto ha sulla stabilita' della SLM. Cosi', in un primo momento, e' stata ottimizzata le procedura di modifica del supporto, facendo una selezione tra vari composti (acido solforico, acido nitrico, acido cromico, sodio dodecil solfato (SDS), glicerolo, alcool oleico, glicole propilenico (PPG), siero di albumina bovina (BSA)) basata su misure dell'angolo di contatto. Successivamente, e' stata realizzata una seconda selezione mediante prove di permeazione in una cella agitata. Infine, con lo scopo di confrontare la stabilita' della SLM con supporto modificato rispetto

  20. Caracterización de los ácidos húmicos extraídos de cuatro lombricompuestos y su efecto sobre la germinación de semillas de maíz Zea mays L., algodón Gossypium hirsutum y tomate Lycopersicon esculentum L.

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    Gómez Zambrano Jairo

    1996-12-01

    Full Text Available

    The work perfomed to characterize the elemental composition and functional groups of humic acids extracted from four lombricompost cow dung, filter press cake of sugar cane, coffee pulp and grass residue the total content of essential elements and its distribution in the humic and no humic fractions were determined. It was evalued the effect of two concentrations of humic acids (150 and 300 ppm upon seed germination of maize, cotton and tomat. There were found differences in the elemental composition (CHON and functional groups (COOH, OH phedic and carbony of the humic acids atributed to variations in composition of the original substrates. The lombricompost of cow dung showed higher oxidation values (O/H = 0.49 than the lombricompost of filter press cake of sugar cane (0.40 sugering a higher grade of humification of the first. The grass residue showed higher contribution to the CIC (COOH + OH = 9. O me/g than the coffe pulp (7. 1 me/g the total essential elements were concentrated in the remanent residue, with lower content in the water and 0.1M HCL solutions; the fulvic and humic fractions had very low content of these elements. The humic acid at the concentrations tested did not have any effect on the germination of maize and cotton, and depressed the germination of tomato seeds.

    El trabajo se realizó con el fin de caracterizar por su composición elemental y contenido de grupos funcionales, los acidos húmicos extraídos de cuatro lombricompuestos (bovinaza, cachaza, pulpa de café y residuo de prado. Se determinó el contenido y distribución de los elementos esenciales totales en las fracciones húmicas y no de acidos húmicas. Se evaluó el efecto de dos concentraciones de acidos húmicos (150 y 300 ppm sobre la germinación de semillas de maíz, algodón y tomate. Se encontraron diferencias en el contenido elemental (CHON y grupos funcionales (COOH, OH fenólico y carbonilo atribuido a variaciones en la composición de los