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Sample records for dehypothenemus hampei ferr

  1. Abondance de Hypothenemus hampei Ferr., scolyte des graines de cafe, en fonction de sa plante-hote et de son parasite Cephalonomia stephanoderis Betrem, en Cote d'Ivoire

    NARCIS (Netherlands)

    Koch, V.J.M.

    1973-01-01



    INTRODUCTION

    The discovery of Cephalonomia stephanoderis BETREM, a new parasite of the coffee berry borer Hypothenemus hampei FERR. (syn. Stephanoderes hampei Ferr.), seemed to open new prospects for

  2. Étude analytique de l'épidémiologie du scolyte des graines de café, Stephanoderes hampei Ferr., en Côte d'Ivoire

    NARCIS (Netherlands)

    Ticheler, J.H.G.

    1961-01-01

    After discussion of the distribution of the insect and of its taxonomic classification, demonstrating the synonymy of S. hampei (Ferr.) and S. coffeae Haged., an attempt was made to analyse the factors playing a role in the epidemiology of the pest.

    Of climatic factors

  3. POTENCIALIDADES DE Heterorhabditis bacteriophora Poinar CEPA HC1 PARA EL MANEJO DEHypothenemus hampei Ferr . II. COMPATIBILIDAD CON Beauveria bassiana (Balsamo ) Vuillemin y Endosulfan

    OpenAIRE

    Sánchez, Lourdes; Rodríguez, MayraG

    2008-01-01

    Heterorhabditis bacteriophora cepa HC1 ha demostrado ser un efectivo agente de control biológico para importantes plagas en las condiciones de Cuba, mostrando también potencialidades para el manejo de la broca del café. Con los objetivos de estudiar el tipo de relaciones que puede establecer con Beauveria bassiana , organismo de amplio uso a escala internacional para el manejo de la broca en condiciones de producción y el insecticida Endosulfan , se ejecutó este trabajo. H. bacteriophora cepa...

  4. Aplikasi Konsep Pengendalian Hama Terpadu untuk Pengendalian Hama Bubuk Buah Kopi (Hypothenemus hampei)

    OpenAIRE

    Inda Laila, Main Sese; Agus, Nurariaty; Saranga, Annie P.

    2011-01-01

    The purpose of the study was to determine the most effective and efficient integrated control package in suppressing coffee berry borer (Hypothenemus hampei Ferr.). The study was conducted in growers??? coffee plantations in Desa Pana, Kecamatan Alla, Kabupaten Enrekang, South Sulawesi and laboratories at the Department of Plant Pests and Diseases, Hasanuddin University, Makassar, from November 2010 to April 2011. The study consisted of five treatments of control packages, namely:...

  5. The coffee berry borer, Hypothenemus hampei: how many instars are there?

    Science.gov (United States)

    After more than a century since the description of the coffee berry borer, Hypothenemus hampei (Ferrari), and dozens of scientific articles on the basic biology of the insect, there is still debate on the number of female larval instars. This paper analyzes the metamorphosis of H. hampei females thr...

  6. Visualizing the mesothoracic spiracles in a bark beetle: The coffee berry borer, Hypothenemus hampei

    Science.gov (United States)

    In a low-temperature scanning electron microscopy study aimed at determining whether the coffee berry borer (Hypothenemus hampei (Ferrari); Coleoptera: Curculionidae: Scolytinae) possesses mycangia, we fortuitously detected the mesothoracic spiracles, which are usually concealed. The mesothoracic s...

  7. Temperature-dependent development and emergence pattern of Hypothenemus hampei (Coleoptera: Curculionidae: Scolytinae) from coffee berries.

    Science.gov (United States)

    Jaramillo, Juliana; Chabi-Olaye, Adenirin; Borgemeister, Christian

    2010-08-01

    The coffee berry borer, Hypothenemus hampei (Ferrari) (Coleoptera: Curculionidae: Scolytinae), is the most important constrain for coffee production throughout the world. Knowledge on the emergence pattern of H. hampei females to infest new berries is crucial to effectively plan control measures. In this laboratory study, we assessed the development of immature stages and the emergence pattern of H. hampei females from the berries by exposing them to temperatures that are typical for high-altitude plantations (> or = 1,700 m above sea level [masl] ) or when coffee is grown under shade trees (20-22 degrees C), and optimum altitude plantations (1,200-1,600 masl) or nonshaded coffee (25-30 degrees C). Fecundity and emergence pattern of H. hampei females from coffee berries varied with temperature. Temperature played a crucial role determining the rate of H. hampei development and therefore the emergence of the females to start a new infestation cycle. The emergence and colonization phases of new colonizing females in coffee plantations with mean temperatures of 20, 25, or 30 degrees C would take place at different moments in the development of the coffee berries, and in some cases more than once. The implications of our findings for an improved, site-specific timing of control interventions against H. hampei are discussed.

  8. Freezing as a treatment to prevent the spread of Hypothenemus hampei (Coleoptera: Curculionidae), in coffee.

    Science.gov (United States)

    Hollingsworth, Robert C; Jang, Eric B; Follett, Peter A

    2013-04-01

    Coffee berry borer, Hypothenemus hampei (Ferrari) is the most serious insect pest of coffee around the world. Although it is already present in most of the world's major coffee growing regions, it is important to delay further spread and to prevent reintroductions that might include hyperparasites or improve the genetic base of existing populations. Green coffee is shipped around the world for custom blending and roasting and such shipments carry the risk of spreading H. hampei. We used heavily infested coffee berries as a surrogate for green coffee to test the freezing tolerance of H. hampei. After freezing, all life stages of H. hampei were dissected from coffee berries and mortality was assessed. Counting all life stages, > 15,000 insects were measured in this study. A temperature of approximately -15 degrees C (range, -13.9 to -15.5) for 48 h provided 100% control of all life stages. A logit regression model predicted coffee might be more economical and acceptable compared with fumigation with methyl bromide, especially for small-scale and organic growers and millers in Hawaii who ship green coffee beans to other islands for custom roasting. Freezing treatments could also be used to kill H. hampei in coffee seeds before export with minimal effects on seed germination if coffee seeds are first dried to critical water content levels in accordance with published methods.

  9. Control of coffee berry borer, Hypothenemus hampei (Ferrari (Coleoptera: Curculionidae: Scolytinae with botanical insecticides and mineral oils

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    Flávio Neves Celestino

    2016-01-01

    Full Text Available The objective of this study was to evaluate botanical oils, mineral oils and an insecticide that contained azadirachtin (ICA for the control of Hypothenemus hampei, in addition to the effects of residual castor oil. We evaluated the effectiveness of the vegetable oils of canola, sunflower, corn, soybean and castor, two mineral oils (assist® and naturol®, and the ICA for the control of H. hampei. The compounds were tested at a concentration of 3.0% (v v-1. The median lethal concentration (LC50 was estimated with Probit analysis. The oil of castor bean and extract of castor bean cake were also evaluated at concentrations of 3.0% (v v-1 and 3.0% (m v-1, respectively. The mortality rates for H. hampei caused by the ICA and the castor oil were 40.8 and 53.7%, with LC50 values of 6.71 and 3.49% (v v-1, respectively. In the castor oil, the methyl esters of the fatty acids were palmitic (1.10%, linoleic (4.50%, oleic (4.02%, stearic (0.50% and ricinoleic acids (88.04%. The extract of the castor bean cake was not toxic to H. hampei. The persistence of the castor oil in the environment was low, and the cause of mortality for H. hampei was most likely the blockage of the spiracles, which prevented the insects from breathing.

  10. Plant extracts on Hypothenemus hampei (Coleoptera: Curculionidae and Beauveria bassianaExtratos vegetais sobre Hypothenemus hampei (Coleoptera: Curculionidae e Beauveria bassiana

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    Janaina Zorzetti

    2012-12-01

    Full Text Available Looking for alternatives to pesticides for Hypothenemus hampei control, the objective of this study was to evaluate the potential of aqueous and ethanolic plant extracts of Moringa oleifera (Moringa and Tephrosia purpurea (tephrosia (seeds, leaves and roots and Melia azedarach (cinnamon, Nerium oleander (oleander and Azadirachta indica (neem (leaves only, on mortality and repellency of H. hampei and its compatibility with Beauveria bassiana, an important natural enemy of this pest. To assess the mortality, coffee leaves (Coffea arabica L were treated by immersion in a solution of endosulfan and plant extracts at a concentration of 10% and then offered to adults of H. hampei. The repellency was evaluated in multiple-choice tests and in no-choice tests among coffee fruit treated and untreated The compatibility between extracts and Beauveria bassiana (CG 452 was analyzed by quantifying germination, colony forming units, growth and yield / productivity of conidia. The highest mortalities were observed when leaves were treated with ethanolic extract of T. purpurea (leaves which did not differ from endosulfan, and aqueous and ethanolic extracts from M. oleifera seeds . In free-choice tests, all the ethanolic extracts showed repellent action, being higher for M. oleifera (root and T. purpurea (seed. The aqueous extracts of M. oleifera (leaves and seeds and N. oleander (leaves showed the highest repellency. In no-choice tests the highest repellency level was for coffee fruits treated with A. indica (leaves. The ethanolic extract of M. oleifera leaves negatively affected B. bassiana germination. These studies showed the potential of these plant extracts for use in the field as an alternative to chemical control, once they are also selective for B. bassiana. Visando alternativas ao uso de agrotóxicos no controle de Hypothenemus hampei, o objetivo deste trabalho foi avaliar o potencial de extratos vegetais aquosos e etanólicos de Moringa oleifera

  11. Freezing as a treatment to prevent the spread of coffee berry borer, Hypothenemus hampei (Ferrari) (Coleoptera: Curculionidae) in coffee

    Science.gov (United States)

    Coffee berry borer, Hypothenemus hampei (Ferrari) is the most serious insect pest of coffee around the world. While it is already present in most of the world’s major coffee growing regions, it is important to delay further spread and to prevent re-introductions which might include hyperparasites or...

  12. Micro-CT unveils the secret life of the coffee berry borer (Hypothenemus hampei; Coleoptera, Curculionidae: Scolytinae) inside coffee berries

    Science.gov (United States)

    The coffee berry borer (Hypothenemus hampei (Ferrari); Coleoptera: Curculionidae: Scolytinae) is the most important insect pest of coffee worldwide, and due to the cryptic life habit of the insect inside coffee berries, effective pest management strategies have been difficult to develop. In this pap...

  13. Effect of Pollen Feed on Parasitization and Predatism of Cephalonomia stephanoderis onHypothenemus hampei

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    Dwi Suci Rahayu

    2014-05-01

    Full Text Available Biological control of the coffee berry borer (Hypothenemus hampeiusing parasitoid Cephalonomia stephanoderishas been developed through the improvement of the parasitoid role may using pollens as feed source. The objective of this study was to investigate the effect of cover crop and weed pollens on parasitization and predatism of C. stephanoderis.The applied treatments were pollens of Turnera ulmifolia, Arachis pintoi, Ageratum conyzoidesadded in glass tube that consist of 10 CBB pupaes and a mated female of C. stephanoderis. Number of pupae parasitized and pupae preyed were observed. The result showed that addition of A. Pintoi pollen increased the number of pupae parasitized at 135% whereas addition of T. ulmifolia and A. conyzoides pollens did not affect parasitization of C. Stephanoderis. The predatismof C. stephanoderiswas higher than parasitization to pupae of H. hampei which showed that the behavior of C. stephanoderiswas parasitization. Addition of T. ulmifolia, A. pintoi, and A. conyzoidespollens increased the number of pupae predatism at 132%, 102%, and 225%, respectively. Key words: Ageratum conyzoides, Arachis pintoi, Cephalonomia stephanoderis, Hypothenemus hampei,parasitization, predatism, pollens, Turnera ulmifolia

  14. Producción masiva automatizada de la broca del café Hypothenemus hampei Ferrari (Coleóptera: Scolytidae) y de sus parasitoides sobre dietas artificiales

    Science.gov (United States)

    This article reviews the current state of knowledge concerning the mass rearing system of the coffee berry borer, cbb, Hypothenemus hampei (Ferrari) (Coleoptera: Scolytidae), and its African parasitoids: the ectoparasitoids Cephalonomia stephanoderis (Betrem) and Prorops nasuta ((Waterston) (Hymenop...

  15. Abridged life tables for Cephalonomia stephanoderis and Prorops nasuta (Hymenoptera: Bethylidae) Parasitoids of Hypothenemus hampei (Coleoptera: Scolytidae) reared on artificial diet

    Science.gov (United States)

    Biological aspects and demographic parameters of Cephalonomia stephanoderis Betrem (Hymenoptera: Bethylidae) and Prorops nasuta Waterston (Hymenoptera: Bethylidae) parasitoids of the coffee berry borer (CBB), Hypothenemus hampei (Ferrari) (Coleoptera: Curculionidae: Scolytinae) were investigated usi...

  16. Mel de abelhas sem ferrão: proposta de regulamentação

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    Ricardo Costa Rodrigues de Camargo

    Full Text Available Resumo Os méis das abelhas sem ferrão são produtos únicos da biodiversidade brasileira, presentes e valorizados pela cultura popular desde os povos originais das Américas. Por ser mais ácido e apresentar maior teor de umidade, seu sabor é peculiar e sua viscosidade é menor quando comparada ao mel proveniente da espécie exótica Apis mellifera. Devido a essas diferenças, esse produto necessita do estabelecimento de parâmetros físico-químicos específicos que sejam referência tanto para controle de qualidade como para sua comercialização. Com base em pesquisas realizadas pela Embrapa, pelo Instituto de Tecnologia de Alimentos de Campinas e pelo levantamento bibliográfico de diversos estudos científicos realizados por outros institutos de ensino e pesquisa, esta comunicação tem como objetivo esclarecer as peculiaridades deste produto e apresentar uma proposta de Regulamento Técnico de Identidade e Padrão para o Mel das Abelhas Sem Ferrão, visando sua comercialização no Estado de São Paulo, contribuindo assim para a disponibilidade de um produto seguro e de qualidade para o consumidor final.

  17. Ferréz: más allá del documentalismo

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    Lucía Tennina

    2017-01-01

    Full Text Available Este artículo apunta a pensar el lugar central que ocupa la producción de Ferréz entre las producciones de la literatura brasileña del presente a partir de la contemporaneidad de sus interrogantes. Sostenemos que en sus dos primeras novelas, Capão pecado (2000 y Manual prático do ódio (2003 lleva a cabo un proceso de desestabilización y reactualización de la distinción entre ficción y no ficción, por un lado, y una propuesta singular del estatuto de lo real, por otro.

  18. Caracterización de aislamientos del hongo entomopatógeno beauveria bassiana y su patogenicidad en hypothenemus hampei (coleoptera: curculionidae, scolytinae).

    OpenAIRE

    Cañizalez Briceño, Luis Miguel; Guedez de Olivar, Clemencia; Castillo, Carmen Elena; Olivar, Rafael

    2015-01-01

    La broca (Hypothenemus hampei) es insecto plaga que causa pérdidas considerables en café. El principal control ha sido el químico, sin embargo, actualmente se buscan alternativas más ecológicas. El objetivo fue caracterizar 12 aislamientos nativos de Beauveria bassiana y evaluar el control en la broca. La caracterización involucró la morfología, fisiología y patogenicidad de los aislamientos en adultos de H. hampei. El tamaño de los conidios osciló entre 2,55 y 2,42 micras. La ger...

  19. Effects of gamma irradiation on different phases of coffee borer Hypothenemus hampei (Ferrari, 1867)

    International Nuclear Information System (INIS)

    Wiendl, F.M.; Silva, A.L. da.

    1974-10-01

    Two experiments carried out in order to determine immediate lethal doses (LD sub(I)) for gamma irradiation of larvae, pupae and adults hypothenemus hampei (Ferrari, 1867) are presented. One experiment aimed only the determination of LD sub(I) for the adults of the coffee borer-outside the coffee-berries. The other to obtain the equivalent data for insects inside the coffee-berry, for all phases of the development cycle of the insect. It was found that LD sub(I) for larvae was around 350 Krad and for pupae around 400 Krad. For the adults, the LD sub(I) for insects outside the coffee-berry was 475 Krad and 525 for insects inside the coffee-berry. It was found that smaller doses caused a pronunced decrease in the insect lifetime, lifetime decrease proportionally as the irradiation dose increase. According to the results obtained, is postulated that this species of coffee-borer may be considered resistant to gamma radiation [pt

  20. Draft genome of the most devastating insect pest of coffee worldwide: the coffee berry borer, Hypothenemus hampei

    KAUST Repository

    Vega, Fernando E.

    2015-07-31

    The coffee berry borer, Hypothenemus hampei, is the most economically important insect pest of coffee worldwide. We present an analysis of the draft genome of the coffee berry borer, the third genome for a Coleopteran species. The genome size is ca. 163 Mb with 19,222 predicted protein-coding genes. Analysis was focused on genes involved in primary digestion as well as gene families involved in detoxification of plant defense molecules and insecticides, such as carboxylesterases, cytochrome P450, gluthathione S-transferases, ATP-binding cassette transporters, and a gene that confers resistance to the insecticide dieldrin. A broad range of enzymes capable of degrading complex polysaccharides were identified. We also evaluated the pathogen defense system and found homologs to antimicrobial genes reported in the Drosophila genome. Ten cases of horizontal gene transfer were identified with evidence for expression, integration into the H. hampei genome, and phylogenetic evidence that the sequences are more closely related to bacterial rather than eukaryotic genes. The draft genome analysis broadly expands our knowledge on the biology of a devastating tropical insect pest and suggests new pest management strategies.

  1. Draft genome of the most devastating insect pest of coffee worldwide: the coffee berry borer, Hypothenemus hampei

    KAUST Repository

    Vega, Fernando E.; Brown, Stuart M.; Chen, Hao; Shen, Eric; Nair, Mridul B.; Ceja-Navarro, Javier A.; Brodie, Eoin L.; Infante, Francisco; Dowd, Patrick F.; Pain, Arnab

    2015-01-01

    The coffee berry borer, Hypothenemus hampei, is the most economically important insect pest of coffee worldwide. We present an analysis of the draft genome of the coffee berry borer, the third genome for a Coleopteran species. The genome size is ca. 163 Mb with 19,222 predicted protein-coding genes. Analysis was focused on genes involved in primary digestion as well as gene families involved in detoxification of plant defense molecules and insecticides, such as carboxylesterases, cytochrome P450, gluthathione S-transferases, ATP-binding cassette transporters, and a gene that confers resistance to the insecticide dieldrin. A broad range of enzymes capable of degrading complex polysaccharides were identified. We also evaluated the pathogen defense system and found homologs to antimicrobial genes reported in the Drosophila genome. Ten cases of horizontal gene transfer were identified with evidence for expression, integration into the H. hampei genome, and phylogenetic evidence that the sequences are more closely related to bacterial rather than eukaryotic genes. The draft genome analysis broadly expands our knowledge on the biology of a devastating tropical insect pest and suggests new pest management strategies.

  2. Some like it hot: the influence and implications of climate change on coffee berry borer (Hypothenemus hampei and coffee production in East Africa.

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    Juliana Jaramillo

    Full Text Available The negative effects of climate change are already evident for many of the 25 million coffee farmers across the tropics and the 90 billion dollar (US coffee industry. The coffee berry borer (Hypothenemus hampei, the most important pest of coffee worldwide, has already benefited from the temperature rise in East Africa: increased damage to coffee crops and expansion in its distribution range have been reported. In order to anticipate threats and prioritize management actions for H. hampei we present here, maps on future distributions of H. hampei in coffee producing areas of East Africa. Using the CLIMEX model we relate present-day insect distributions to current climate and then project the fitted climatic envelopes under future scenarios A2A and B2B (for HADCM3 model. In both scenarios, the situation with H. hampei is forecasted to worsen in the current Coffea arabica producing areas of Ethiopia, the Ugandan part of the Lake Victoria and Mt. Elgon regions, Mt. Kenya and the Kenyan side of Mt. Elgon, and most of Rwanda and Burundi. The calculated hypothetical number of generations per year of H. hampei is predicted to increase in all C. arabica-producing areas from five to ten. These outcomes will have serious implications for C. arabica production and livelihoods in East Africa. We suggest that the best way to adapt to a rise of temperatures in coffee plantations could be via the introduction of shade trees in sun grown plantations. The aims of this study are to fill knowledge gaps existing in the coffee industry, and to draft an outline for the development of an adaptation strategy package for climate change on coffee production. An abstract in Spanish is provided as Abstract S1.

  3. Óxidos de manganês em solos do quadrilátero ferrífero (MG

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    Amaury de Carvalho Filho

    2011-06-01

    Full Text Available A mineralogia dos óxidos de Mn é muito variada e complexa, devido ao grande número de minerais e ao conhecimento inexato de algumas de suas estruturas. Devido à escassez de trabalhos que tratam especificamente de óxidos de Mn em solos brasileiros e seu conteúdo muito elevado em alguns solos do Quadrilátero Ferrífero (MG, este estudo objetivou caracterizar a química e a mineralogia desses óxidos nos solos dessa região, estratificando-os conforme os materiais de origem e posições na paisagem. O trabalho foi desenvolvido em uma área representativa do Quadrilátero Ferrífero, referente à Área de Proteção Ambiental da Região Metropolitana de Belo Horizonte - APA Sul RMBH, com extensão de 1.625,32 km²; a amostragem foi direcionada para a caracterização de solos com elevado teor de Mn, relacionados a três materiais de origem distintos: itabiritos, dolomitos ferruginosos e serpentinitos, tendo sido incluídos ainda alguns solos provenientes de outros materiais de origem, dentro do Quadrilátero. Alguns solos do Quadrilátero Ferrífero possuem teores de Mn na fração terra fina extraordinariamente elevados, principalmente aqueles relacionados aos dolomitos ferruginosos da Formação Gandarela. Foram identificados diversos minerais de Mn na fração argila dos solos, sem quaisquer pré-tratamentos de concentração, representados por todoroquita, litioforita e, ainda, pirolusita. A influência do material de origem no contexto deste estudo foi superior àquela da posição na paisagem e grau de intemperismo de solos ricos em Mn.

  4. Ferréol Gilles, Mamontoff Anne-Marie, ss. Dir., Tourisme et sociétés

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    Régis Malige

    2010-10-01

    Full Text Available Le colloque international et pluridisciplinaire organisé en octobre 2008, à l’initiative de l’UFR “Sports, tourisme et hôtellerie” de l’université de Perpignan Via Domitia et du laboratoire de socio-anthropologie (LASA de l’université de Franche-Comté, s’est intéressé aux relations unissant tourisme, loisirs et sociétés. Coordonné par Gilles Ferréol assisté d’Anne-Marie Mamontoff, l’ouvrage, rassemblant des participants appartenant à diverses institutions académiques, regroupe une douzaine d...

  5. Diversity of Bacillus thuringiensis strains isolated from coffee plantations infested with the coffee berry borer Hypothenemus hampei

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    Glen Arrieta

    2004-09-01

    Full Text Available The coffee berry borer Hypothenemus hampei Ferrari (Coleoptera: Scolytidae was first reported infecting Costa Rican coffee plantations in the year 2000. Due to the impact that this plague has in the economy of the country, we were interested in seeking new alternatives for the biological control of H. hampei, based on the entomopathogenic bacteria Bacillus thuringiensis. Atotal of 202 B. thuringiensis isolates obtained from Costa Rican coffee plantations infested with H. hampei were analyzed through crystal morphology of the crystal inclusions and SDS-PAGE of d-endotoxins, while 105 strains were further evaluated by PCR for the presence cry, cyt and vip genes. Most of the Bt strains showed diverse crystal morphologies: pleomorphic (35%, oval (37%, bipyramidal (3%, bipyramidal and oval (12%, bipyramidal, oval and pleomorphic (10% and bipyramidal, oval and cubic (3%. The SDS-PAGE analyses of the crystal preparations showed five strains with delta -endotoxin from 20 to 40 kDa, six from 40 to 50 kDa, seven from 50 to 60 kDa, 19 from 60 to 70 kDa, 29 from 70 to 100 kDa and 39 from 100-145 kDa. PCR analyses demonstrated that the collection showed diverse cry genes profiles having several genes per strain: 78 strains contained the vip3 gene, 82 the cry2 gene, 45 the cry1 and 29 strains harbored cry3-cry7 genes. A total of 13 strains did not amplified with any of the cry primers used: cry1, cry2, cry37, cry5, cry11, cry12 and cry14. Forty-three different genetic profiles were found, mainly due to the combination of cry1A genes with other cry and vip genes. The genetic characterization of the collection provides opportunities for the selection of strains to be tested in bioassays against H. hampei and other insect pests of agricultural importance. Rev. Biol. Trop. 52(3: 757-764. Epub 2004 Dic 15.En el año 2000 se reportó por primera vez la principal plaga del cafeto, conocida como broca (Hypothenemus hampei Ferrari (Coleoptera: Scolitidae en

  6. Cloning and expression of an endo-1,4-β-xylanase from the coffee berry borer, Hypothenemus hampei

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    Padilla-Hurtado Beatriz

    2012-01-01

    Full Text Available Abstract Background The coffee berry borer, Hypothenemus hampei, reproduces and feeds exclusively on the mature endosperm of the coffee seed, which has a cell wall composed mainly of a heterogeneous mixture of hemicellulose polysaccharides, including arabinoxylans. Xylanases are digestive enzymes responsible for the degradation of xylan based polymers, hydrolyzing them into smaller molecules that are easier to assimilate by insects. We report the cloning, expression and enzymatic characterization of a xylanase gene that was identified in the digestive tract of the coffee berry borer. Methods The complete DNA sequence encoding a H. hampei xylanase (HhXyl was obtained using a genome walking technique in a cDNA library derived from the borer digestive tract. The XIP-I gene was amplified from wheat (Triticum aestivum variety Soisson. A Pichia pastoris expression system was used to express the recombinant form of these enzymes. The xylanase activity and XIP-I inhibitory activity was quantified by the 3,5-dinitrosalicylic (DNS. The biological effects of XIP-I on borer individuals were evaluated by providing an artificial diet enriched with the recombinant XIP-I protein to the insects. Results The borer xylanase sequence contains a 951 bp open reading frame that is predicted to encode a 317-amino acid protein, with an estimated molecular weight of 34.92 kDa and a pI of 4.84. Bioinformatic analysis revealed that HhXyl exhibits high sequence homology with endo-β-D-xylanases of Streptomyces bingchenggensis from glycosyl hydrolase 10 (GH10. The recombinant xylanase showed maximal activity at pH 5.5 and 37°C. XIP-I expressed as a recombinant protein inhibited HhXyl activity in vitro and caused individual H. hampei mortality in bioassays when included as a supplement in artificial diets. Conclusion A xylanase from the digestive tract of the coffee berry borer was identified and functionally characterized. A xylanase inhibitor protein, XIP-I, from wheat was

  7. Effect of picung (Pangium edule plant extracts as a botanical pesticide on mortality of coffee berry borer (Hypothenemus hampei

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    soekadar wiryadiputra

    2014-12-01

    Full Text Available Coffee pests known as coffe berry borer (CBB, Hypothenemus hampei were main pests which decreasing the productivity of Indonesian coffee. One of pests controlling was done by insecticides. Generally, plant uses for insecticide show high security level, because the breaking molecule was easy as not dangerous compound. Pangium edule contains of flavanoide, cyanide acid and saponin had potential as an botanical insecticide. The purpose of this research was to prove the potential extract of seed and leaves of picung (Pangium edule as an botanical insecticide for CBB. This research used a complete random design. There were 8 treatments with the concentration of the extract from leaves and seed of picung, one positive control treatment (Carbaril 0,02% formulation and one negative control treatment (aquades. The treatment was repeated four times and carried out observation on every day until six days. The concentrations leaf and seed extracts were 1.0%, 2.5% and 5.0%. The result of the research show that between concentration applied the were no significant different and at observation six days after application the mortality of CBB only around 35 -40% on both extracts (ewater and methanol. The result of the research also show that there were no real differentiation between leaves and seed of picung. LT-50 values were 1.25% and 0.96%, for leaves and seed extract in water for six day observation. From this observation could be concluded that picung tree (Pangium edule is not effective in the controlling CBB in the interval concentration applied and extraction method used. Key words: Botanical pesticide, picung tree, Pangium edule, mortality, Hypothenemus hampei, water extraction, methanol extraction.

  8. Validez predictiva del instrumento de evaluación de riesgos y recursos para la intervención FER-R, en adolescentes chilenos infractores de ley / Predictive Validity at the Instrument Risk and Resources (FER-R for Intervention Assessment with Young Offenders: Preliminary Study

    Directory of Open Access Journals (Sweden)

    Paula Alarcón

    2012-12-01

    Full Text Available Se estudió la validez predictiva del instrumento Ficha de Evaluación de Riesgos y Recursos (FER-R para adolescentes infractores de ley, en un lapso de dos años (2009-2011. La FER-R consta de 60 ítems y permite el registro de 10 dominios, riesgos criminogénicos, recursos y el registro de un índice de escalada delictiva. La muestra estuvo conformada por 101 adolescentes varones, entre 14 y 19 años de edad, judicializados y deriva- dos a programas de intervención en medio libre. Los principales resultados muestran que el índice general de riesgo medido por la FER-R, presenta un 68.3 % de aciertos, con un área bajo la curva ROC = 0.73, indicando una magnitud predictiva fuerte de la escala total para predecir reincidencia en los adolescentes infractores chilenos.

  9. La denuncia a través de la mujer: La casa de la laguna, de Rosario Ferré

    Directory of Open Access Journals (Sweden)

    Ana Molestina

    2015-08-01

    Full Text Available La historia puertorriqueña es una historia de imposiciones identitarias, choques culturales y ambivalencia desde la llegada de los españoles a la isla. En La casa de la laguna, Ferré analiza el pasado  y el presente de Puerto Rico. Crea una reconstrucción simbolizada en la historia de las familias Mendizábal-Monfort, en la cual Isabel Monfort, trata de descubrir las causas del fracaso de su matrimonio. En esta búsqueda y reflexión personal, se representan las versiones olvidadas o silenciadas de la historia puertorriqueña y de igual manera, da voz y vida a las mujeres marginadas o silenciadas.

  10. El diálogo entre los perros de Miguel de Cervantes y las perras de Rosario Ferré

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    Giovanna Rosa Pollarolo Giglio

    2018-06-01

    Full Text Available En 1990, la escritora puertorriqueña Rosario Ferré publicó El coloquio de las perras, un volumen que reunía un conjunto de nueve artículos y un relato ficcional, «El coloquio de las perras» título que alude de manera directa a la novela corta que Miguel de Cervantes incluyó en sus Novelas ejemplares en 1613. Si en el coloquio de Cervantes los perros Cipión y Berganza dialogan asombrados ante el portento de descubrirse no solo hablando «sino hablando con discurso», es decir, con raciocinio; en el de Ferré, Fina y Franca son dos perras, una escritora y la otra crítica, que dialogan sin asombro sobre la condición femenina en relación con la escritura y la crítica literaria. El presente trabajo se propone indagar, a partir de la explícita relación que establecen el título y la condición de animales que hablan como humanos, cómo se produce el diálogo intertextual entre las dos obras, preguntándose si se trata de un texto que desde Latinoamérica y a finales del siglo XX subvierte, mediante la ironía o parodia, las propuestas éticas y estéticas que Cervantes puso en boca de Cipión y Berganza en el siglo XVII.

  11. Estudo da qualidade do mel de abelhas sem ferrão por análise por ativação neutrônica instrumental

    OpenAIRE

    André Luís Lima de Araujo

    2013-01-01

    O Brasil é um dos maiores produtores mundiais de mel, no qual sua produção é baseada principalmente na criação da espécie exótica Apis mellifera. A produção de mel da Apis mellifera é cerca de 10 vezes maior que das espécies de abelhas sem ferrão, contudo, o mel de abelhas nativas possui maior valor comercial. Embora pouco explorado, o mel de abelhas sem ferrão desperta interesse em indústrias de cosméticos e medicinas naturais. A sua produção se apresenta como uma ferramenta com grande poten...

  12. Trauma e testemunho da vida periférica: a narrativa de Ferréz como denúncia da existência lesada

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    Renato Nunes Bittencourt

    2015-05-01

    Full Text Available Neste artigo analisamos a visão de mundo apresentada pelo romancista Reginaldo Ferreira da Silva, dito Ferréz, expoente da dita Literatura Marginal brasileira nas suas obras que retratam vivamente o cotidiano incerto da vida do homem habitante da periferia urbana, regida pelo descaso político e pela violência totalitária do regime excludente do capitalismo tardio. Ferréz, ao testemunhar em seus escritos a experiência terrível da vida periférica, contribui magistralmente para a compreensão desse fenômeno aviltante da condição humana, proporcionando assim um diálogo interdisciplinar entre Literatura, Filosofia, Sociologia e outros discursos subjacentes.

  13. Análise microestrutural e tenacidade ao impacto da ZAC do aço inoxidável ferrítico com 11%Cr

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    Temístocles de Sousa Luz

    2013-09-01

    Full Text Available O aço inoxidável ferrítico possibilita, em função de suas características, o uso em diversos campos da engenharia. Dentre esses é possível citar a industria do petróleo e gás, de celulose açucareira, de transporte, entre outras. Atualmente, o desenvolvimento de novas ligas para a substituição dos aços ao carbono no que se refere ao setor de transporte de carga, levou muitos fabricantes a adotarem a liga ferrítica com base de cromo entre 11% e 12%, implementando a tal situação, uma maior vida util. A utilização dessa nova classe de aço inoxidável ferrítico gera uma demanda no que tange à pesquisas das soldas desses aços. Neste trabalho, buscou-se analisar a região soldada de um aço inoxidável ferrítico experimental contendo 11% de cromo, realizando para tal um estudo de sua microestrutura, e tenacidade ao impacto do metal de base e da zona afetada pelo calor (ZAC. A avaliação mostrou bons resultados nas propriedades mecânicas medidas nas duas regiões analisadas. Entretanto, verificou-se uma perda acentuada da tenacidade ao impacto na ZAC em relação ao metal de base.

  14. Transformaciones Microestructurales en Soldaduras Disímiles de Acero Inoxidable Austenítico con Acero Inoxidable Ferrítico

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    Sara María Aguilar-Sierra

    2015-03-01

    Full Text Available En este trabajo se estudian los fenómenos metalúrgicos que ocurren en la soldadura SMAW de un acero inoxidable ferrítico AISI 430 con un acero inoxidable austenítico AISI 316L. Para el estudio se utilizaron dos tipos de electrodos: austenítico AWS E309L y dúplex AWS E2209-16, ambos con un diámetro de 3,2 mm. Las uniones soldadas se realizaron con un solo pase y se variaron simultáneamente la corriente y la velocidad de soldadura; las condiciones fueron 49 A y 2,4 mm.s–1como valores bajos y 107 A y 4,3 mm.s–1como valores altos. Se evaluó la influencia del tipo de electrodo y de los parámetros de soldadura en la evolución microestructural de las zonas afectadas por el calor y de las zonas de fusión, encontrando diferencias en la morfología y cantidad de ferrita delta para todas las condiciones estudiadas. Se evidenció crecimiento y refinación de grano ferrítico y formación de martensita en la zona afectada por el calor del metal base ferrítico. Se evaluó también la resistencia a la tensión hallando similitudes en todas las soldaduras.

  15. Crafting traps with attractant alcoholics an alternative for monitoring and control of borer coffee, Hypothenemus hampei (Ferrari 1867

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    Agramont Richard

    2010-10-01

    Full Text Available The necessity to incorporate an alternative, for monitoring and control of the borer coffee, Hypothenemus hampei (Ferrari (Choleoptera: Curculionidae to be feasible for the use of the coffee producers, in the community Choro, Coripata municipality, second section of Nor Yungas province, La Paz Bolivia. It was evaluated the capture of adult borer coffee individuals using 45 traps into 1,5 hectares distributed at random with four repetitions. It was used three types of craft traps, built with disposable plastic bottles of soft drinks, with the traps Casera, Brocap and Yessica, were evaluated three treatments: mixture of alcohols methyl (M and ethylic (E in proportions 3:1; mix 1:1 of (M and (E; mix 1:1:1 of (M (E and coffee fresh cherry liquated (CFCL and water as a witness. The largest captures of adult individuals, were present in the crafting traps with mixture of (M(E 3:1 with overalls (± standard deviation adults/traps/ten days of 3414,5±3227,7 being superior to the other treatments. The crafting trap is one of the alternatives for the control and monitoring of the borer in the coffee plantations. The use of crafting traps with alcoholic attractants for the capture of adult individuals, is present as a low cost alternative, being feasible the successful use by the producers into the management integrated programs.

  16. Aspectos biológicos, morfológicos y genéticos de Hypothenemus obscurus e Hypothenemus hampei (Coleoptera: Curculionidae: Scolytinae)

    OpenAIRE

    CONSTANTINO, LUIS M.; NAVARRO, LUCIO; BERRIO, ALEJANDRO; ACEVEDO, FLOR E.; RUBIO, DAVID; BENAVIDES, PABLO

    2011-01-01

    Existen dos especies de Hypothenemus en Colombia de importancia económica: H. hampei y H. obscurus. La primera es la plaga más destructiva del café, mientras que la segunda ataca varias especies, incluyendo macadamia y café. El objetivo de esta investigación fue comparar estas dos especies, biológica, morfológica y genéticamente, con el fin de establecer diferencias que expliquen la adaptación de la broca al café. Los insectos fueron criados en dieta artificial de café y macadamia para estudi...

  17. Bioatividade da azadiractina e de inseticidas sintéticos sobre a broca-do-café, Hypothenemus hampei (FERRARI, 1867) (COLEOPTERA: CURCULIONIDAE), em laboratório

    OpenAIRE

    Tatiane Lobak

    2016-01-01

    A broca-do-café, Hypothenemus hampei (Ferrari, 1867) (Coleoptera: Curculionidae), é praga limitante à produtividade e a qualidade dos grãos. Com a proibição do uso do endossulfam, para seu controle, em 2013, novas alternativas devem ser pesquisadas, visto que atualmente tem se seis princípios ativos registrados no Brasil, incluindo a azadiractina. Assim, o objetivo deste trabalho foi avaliar a bioatividade da azadiractina e de inseticidas sintéticos sobre a broca-do-café, em condições de labo...

  18. Evaluación de atrayentes alcohólicos en trampas artesanales para el monitoreo y control de la broca del café, Hypothenemus hampei (Ferrari)

    OpenAIRE

    Silvestre, Fernández; Cordero, Julio

    2005-01-01

    RESUMEN Este trabajo se basó en la necesidad de incorporar una estrategia de  control de  la broca del café, Hypothenemus hampei (Ferrari) (Coleóptera: Curculionidae)  factible de ser utilizada por los productores  de café. En la localidad de Caspo, estado Lara, Venezuela, se evaluó la captura de adultos de broca utilizando un tipo de trampa artesanal construida con envases plásticos desechables de bebidas gaseosas. Mediante un ensayo completamente al azar con cuatro repeticiones se evaluaron...

  19. Factores que influyen en la dispersión espacio-temporal de broca del café #Hypothenemus hampei# (Coleoptera: Curculionidae)

    OpenAIRE

    Roman Ruiz, Ariana Karina

    2017-01-01

    La broca del café, Hypothenemus hampei (Ferrari), es la plaga más importante del café, Coffea spp., en el mundo. Este insecto ha sido motivo de numerosos estudios, sin embargo, muchos aspectos de su dispersión se desconocen o requieren ser determinados. La presente investigación tuvo el objetivo de estudiar los factores que influyen en la dispersión espacio-temporal de la broca del café. Dado que la dispersión es un proceso complejo, para ser estudiada se desarrollaron técnicas para la obtenc...

  20. Efecto de la dieta artificial MP sobre la emergencia y relacion de sexos de Phymastichus coffea (Hymenoptera:Eulophidae) mantenido sobre su hueped, Hypothenemus hampei (Coleoptera: Scloytidae)a traves de generaciones contin

    Science.gov (United States)

    Phymastichus coffea La Salle (Hymenoptera: Eulophidae) is an endoparasitoid that attacks the adult coffee berry borer, Hypothenemus hampei Ferrari (Coleoptera: Scolytidae). The MP diet developed by Portilla and Streett is the only reported diet that allows cultures of P. coffea to develop and repr...

  1. Caracterização microbiológica do veneno do ferrão do Bagre (Cathorops agassizii and Genidens genidens

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    Marcos Emerson Pinheiro Junqueira

    2006-12-01

    Full Text Available Este trabalho teve por objetivo o estudo da contaminação bacteriana do veneno do ferrão dos bagres Genidens genidens (Valenciennes, 1839; e Cathorops agassizii (Agassiz, 1829 encontrados no Complexo Baia-Estuário de Santos e de São Vicente (Estado de São Paulo. Foram obtidas amostras dos peixes para análises bacteriológicas que constituíam de um grupo de 50 espécimes sendo, 25 Cathorops agassizii e 25 de Genidens genidens. As análises bacteriológicas mostraram que havia contaminação nos ferrões por 13 diferentes linhagens de Enterobacteriaceae, sendo a Klebsiella pneumoniae (26,80% a bactéria mais freqüente enquanto que as Enterobacter sp e Escherichia coli (16,27%, Serratia marcescens, Serratia sp e Proteus mirabilis (1,16% apresentaram os mais baixos percentuais de contaminação. Nas amostras que apresentaram Bactérias Gram positivas não foram detectadas espécies de fungos. Enquanto que nas amostras que apresentaram bactérias Gram negativas, foi possível considerar alta contaminação bacteriana representando periculosidade em relação aos aspectos ambientais voltados á saúde pública. Destaca-se ainda que acidentes ocorridos por ferimentos causados em função do ferrão do bagre podem desenvolver significativas infecções secundárias agudas em humanos.

  2. Ferréol Gilles, Vieille-Marchiset Gilles, Dir., Loisirs, sports et sociétés. Regards croisés

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    Jean-Marie Seca

    2011-02-01

    Full Text Available Cette contribution, coordonnée par Gilles Ferréol et Gilles Vieille-Marchiset, s’inscrit dans le cadre général de la sociologie des loisirs et de la culture. Elle s’orga­nise en une introduction et en onze chapitres, répartis en deux parties (cinq pour la pre­mière et six pour la seconde. Quinze auteurs, enseignants et chercheurs, spécialisés principalement dans le domaine des activités physiques et sportives, y participent. Outre la dimension internationale du volume (contributeurs suisses,...

  3. Presença de cinco rainhas fisogástricas em colônia de abelha sem ferrão (Melipona scutellaris Latreille)

    OpenAIRE

    Carvalho, Carlos Alfredo Lopes de; Souza, Bruno de Almeida; Dias, Carleandro de Souza; Alves, Rogério Marcos de Oliveira; Melo, Alex Fábio de Lima; Soares, Ana Cristina Fermino; Carvalho-Zilse, Gislene Almeida

    2011-01-01

    Polygyny, characterized by the presence of several egg-laying queens, is considered as a temporary colony status. In stingless bees it is rarely observed. This paper reports the first case of natural polygyny in Melipona scutellaris colony, with five egg-laying queens.Poliginia, caracterizada pela presença de mais de uma rainha poedeira, é considerada como uma condição temporária em colônias. Em abelhas sem ferrão isso é raramente observado. Este artigo registra o primeiro caso de poliginia n...

  4. Paisagens culturais, território e patrimônio cultural mineiro no quadrilátero ferrífero de Minas Gerais, Brasil

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    Jeanne Cristina Menezes Crespo

    2014-11-01

    Así, el objetivo de este trabajo es analizar la localidad de Miguel Burnier, en la municipalidad de Ouro Preto, integrante del Quadrilátero Ferrífero. Con ello, buscaremos discutir los impactos socio-culturales derivados de la instalación de las actividades mineras e industriales en un determinado territorio, a partir del estudio la construcción de su identidad territorial y de su patrimonio cultural minero e industrial; elementos estos, configuradores de sus paisajes culturales contemporáneos.

  5. Comportamiento al desgaste por deslizamiento en aceros inoxidables: ferrítico, austenítico, dúplex y martensítico.

    OpenAIRE

    Renedo Rouco, Jordi

    2010-01-01

    En este proyecto se estudia el comportamiento al desgaste por deslizamiento de cuatro aceros representativos de las cuatro grandes familias de aceros inoxidables: ferrítico (AISI 446), austenítico (AISI 316), dúplex (AISI 2205) y martensítico (AISI 420). Para cada uno de ellos se han realizado: caracterización metalográfica, determinación de dureza, densidad y rugosidad, y ensayos de tribología mediante la técnica de bola sobre disco. Esta técnica consiste en deslizar una bola ...

  6. Tratamiento térmico del acero inoxidable ferrítico AISI 430L sinterizado en atmósfera de N2-H2

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    Ruiz-Prieto, J. M.

    2005-12-01

    Full Text Available In this Work the influence of sintering AISI 430L stainless steel in N2-H2 atmosphere on its properties and microstructure have been studied. The presence of nitrogen in the sintering atmosphere leads to complex nitrides formation the AISI 430L sintered steel microstructure. A subsequent heat treatment was applied to modify this microstructure in order to improve the mechanical properties and corrosion resistance of these ferritic stainless steels.Los aceros inoxidables ferríticos, son aceros que contienen esencialmente cromo (12-30 % junto con níquel y molibdeno en cantidades que, en general, no sobrepasan el 1 % y, en ocasiones, se les adicionan otros elementos como son el aluminio, silicio, titanio o niobio. En el presente trabajo de investigación se ha evaluado la influencia del nitrógeno presente en la atmósfera de sinterización sobre la microestructura y propiedades del acero inoxidable ferrítico AISI 430L. Además, se ha realizado un tratamiento térmico posterior de hipertemple y maduración con el objeto de incrementar las propiedades mecánicas y a corrosión de este acero inoxidable, mediante la modificación microestructural de los nitruros complejos de hierro y cromo precipitados durante la etapa de sinterización.

  7. Molecular cloning and characterization of an α-amylase cDNA highly expressed in major feeding stages of the coffee berry borer, Hypothenemus hampei.

    Science.gov (United States)

    Bezerra, C A; Macedo, L L P; Amorim, T M L; Santos, V O; Fragoso, R R; Lucena, W A; Meneguim, A M; Valencia-Jimenez, A; Engler, G; Silva, M C M; Albuquerque, E V S; Grossi-de-Sa, M F

    2014-12-10

    α-Amylases are common enzymes responsible for hydrolyzing starch. Insect-pests, whose larvae develop in seeds, rely obligatorily on α-amylase activity to digest starch, as their major food source. Considering the relevance of insect α-amylases and the natural α-amylase inhibitors present in seeds to protect from insect damage, we report here the molecular cloning and nucleotide sequence of the full-length AmyHha cDNA of the coffee berry borer, Hypothenemus hampei, a major insect-pest of coffee crops. The AmyHha sequence has 1879 bp, containing a 1458 bp open reading frame, which encodes a predicted protein with 485 amino acid residues, with a predicted molecular mass of 51.2 kDa. The deduced protein showed 55-79% identity to other insect α-amylases, including Anthonomus grandis, Ips typographus and Sitophilus oryzae α-amylases. In depth analysis revealed that the highly conserved three amino acid residues (Asp184, Glu220, and Asp285), which compose the catalytic site are also presented in AmyHha amylase. The AmyHha gene seems to be a single copy in the haploid genome and AmyHha transcription levels were found higher in L2 larvae and adult insects, both corresponding to major feeding phases. Modeling of the AmyHha predicted protein uncovered striking structural similarities to the Tenebrio molitor α-amylase also displaying the same amino acid residues involved in enzyme catalysis (Asp184, Glu220 and Asp285). Since AmyHha gene was mostly transcribed in the intestinal tract of H. hampei larvae, the cognate α-amylase could be considered a high valuable target to coffee bean insect control by biotechnological strategies. Copyright © 2014. Published by Elsevier B.V.

  8. Traps craft with attractive alcoholics in the control of the coffee berry borer, Hypothenemus hampei (Ferrari 1867 in Cologne Bolinda, Caranavi

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    Quispe-Condori Rosalía

    2015-05-01

    Full Text Available The coffee is one of the main cultivated crops in the Caranavi region, among the biotic stress factors; the borer of the coffee (Hypothenemus hampei is the one that affects significantly and negatively. In order to finding alternative practical and economic for the control of the pest, it was carried this investigation in the “Bolinda” Colony of the Caranavi Municipality La Paz-Bolivia, the trial was established under a completely random, design with two study factors, e three replications, 1.5 ha distributed at random in the coffee plantations. Three types of traps were built handmade. These were, INIA, ECOIAPAR and TRAP BORER, in combination with the attractive mixtures of alcohols methanol (M and ethanol (E in the proportion of 3: 1; it mixes 3: 1: 1 M-E+milled coffee, 2: 1 M-E and commercial alcohol as check. Borer/trap/attractive capture was evaluated. He she was highly significant statistical differences among them. The biggest captures female adults of Hipothenemus hampei were presented in the proportion 2: 1 of M-E and ECOIAPAR trap (T8 was identified as the most efficient and economic, being able to capture 4877 borer, with a cost trap (1.50 Bs and the attractive (2.20 Bs, continued by the T2 with the same cost (proportion 3: 1 of M-E and INIA trap with 159 borer and the treatments witnesT9, T5 and T1 (commercial alcohol they obtained smaller captures with 23, 35 and 38 drills, which means that it is not effective for the control. The costs of the implementation of traps the marginal cost of 40 Bolivianos/ha. The results obtained in the study show the biggest borer captures were in December and January, the use of handmade traps constitutes an alternative for the control in the period of postharvest, a more practical and economic method, feasible for the producers.

  9. Pedogênese e classificação de latossolos desenvolvidos de itabiritos no Quadrilátero Ferrífero, MG

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    Samuel Ângelo Diógenes Costa

    2014-04-01

    Full Text Available Localizado na porção centro-oeste do Estado de Minas Gerais, o Quadrilátero Ferrífero abrange uma área de aproximadamente 7.000 km². Desde o século XVII, a região é conhecida como uma província aurífera e ferrífera, sendo por essa razão uma das regiões mais bem estudadas do Brasil no contexto geológico. A região é de topografia muito acidentada, onde predominam solos pouco evoluídos pedogeneticamente, com destaque para Cambissolos Háplicos, Neossolos Litólicos e Neossolos Regolíticos. Em menor proporção e em rampas de colúvio (relevo suave ondulado, ocorrem Latossolos Vermelhos muito ricos em Fe, anteriormente denominados Latossolos Ferríferos. Neste trabalho, foram realizados estudos para caracterizar física, química e mineralogicamente amostras de nove perfis de Latossolos Vermelhos férricos e perférricos, desenvolvidos de itabirito e rochas afins no Quadrilátero Ferrífero, com os objetivos de melhor entender sua gênese e avaliar critérios taxonômicos que permitam sua diferenciação no SiBCS, em níveis categóricos mais baixos. Os elevados valores de densidade de partículas são peculiares nesses solos e, ao lado da estrutura forte, muito pequena e granular, são fatores que contribuem para subestimar os teores de argila e superestimar os de silte, resultando em relação silte/argila maior do que aquela proposta pelo SiBCS para os Latossolos. A variação dos teores de SiO2, Fe2O3, Al2O3, TiO2, MnO, P2O5 e de alguns elementos-traço aponta para a diversidade na composição química do itabirito ou, ainda, provável mistura com rochas filíticas da região. Os valores das relações Fe2O3/TiO2 (não molecular e TiO2/Fe2O3 (molecular revelaram-se diferentes daqueles sugeridos na literatura para separação de Latossolos Vermelhos desenvolvidos de itabirito daqueles de rochas máficas. As frações areia, silte e argila apresentaram grande variação na atração magnética, com as duas primeiras fra

  10. Producción de hierros nodulares ferríticos directamente de fundición partiendo de chatarra de acero de alto manganeso // Production of ferrítics nodular irons directly from foundry leaving of high manganese scrap steel

    Directory of Open Access Journals (Sweden)

    C. DeFranch

    1999-07-01

    Full Text Available La producción de hierros nodulares con matriz ferrítica es lograda normalmente con el uso de arrabios especiales con bajoscontenidos de elementos formadores de carburos, o mediante largos y costosos tratamientos térmicos. Estos arrabios tienenaltos precios, por lo que se hace necesario la búsqueda de variantes más económicas para la producción de este tipo dematerial. El objetivo de este trabajo es la obtención de dicho material usando como carga chatarra de acero, la cual tiene unprecio mucho mas bajo.La estructura de la matriz en el hierro nodular, depende de su composición química, su velocidad de enfriamiento, así como dela forma y cantidad de nódulos de grafito. Cuando lo que se desean son matrices ferríticas se deben mantener los elementosperlitizantes en contenidos lo más bajo posible para desfavorecer de esta forma la solidificación de acuerdo al diagramametaestable.El uso de chatarra plantea el problema de los niveles de manganeso presentes en la misma (generalmente entre 0.6 y 0.8%. Elmanganeso, que es un elemento perlitizante evita la obtención de altas elongaciones ya que la matriz nunca seríacompletamente ferrítica. Es por esto que si se desea usar chatarra de acero como material de carga sea necesario el estudio deformas de eliminarlo del baño.Para la eliminación del manganeso existen diversas referencias en la literatura a procesos desarrollados a base de cloro,oxígeno, sulfatos, óxido de hierro, y procesos con el uso de hornos al vacío.En este trabajo la eliminación del manganeso mediante el uso de óxido de hierro, Sulfato de sodio, y PVC. ha sido investigada,llegando a soluciones factibles para la producción de este tipo de hierro.El primero de los tres métodos ha demostrado ser el más factible ya que el segundo aumenta el contenido de azufre en el baño,requiriendo una desulfuración previa al tratamiento de esferoidización y el tercero de los métodos desprende una gran cantidadde gases da

  11. MODIFICACIÓN DE OLFATÓMETROS DE CUATRO BRAZOS PARA EXPERIMENTACIÓN EN BROCA DEL CAFÉ, HYPOTHENEMUS HAMPEI FERRARI (COLEOPTERA: CURCULIONIDAE

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    Arturo Pacheco

    2012-01-01

    tratamiento en cada olfatómetro. En el olfatómetro de 90° los insectos se vieron claramente atraídos al brazo que contenía el atrayente, con un porcentaje del 45%, mientras que el olfatómetro de 30° tan solo alcanzó un 1,5% de atracción. Las observaciones realizadas durante estas pruebas dejaron en evidencia que las estrategias de ingreso de los insectos a los olfatómetros y el área de ambientación influyeron de manera importante en estos resultados. En una segunda etapa se evaluó el olfatómetro de 90º, al comparar los promedios de atracción de cada uno de sus 4 brazos, y se verificó que las diferencias de atracción en cada brazo no fueron significativas (p<=0,05. Se concluye que el diseño del olfatómetro de 90º es apropiado para realizar pruebas de atracción a compuestos volátiles en hembras adultas de H. hampei.

  12. Influence of age and diet on the performance of Cephalonomia stephanoderis (Hymenoptera, Bethylidae a parasitoid of the coffee berry borer, Hypothenemus hampei (Coleoptera, Curculionidae

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    Jaime Gómez

    2012-03-01

    Full Text Available The importance of age and feeding on the performance of Cephalonomia stephanoderis (Hymenoptera, Bethylidae, a parasitoid of the coffee berry borer, Hypothenemus hampei (Coleoptera, Curculionidae was investigated in the laboratory. Groups of female parasitoids were subject to the following treatments: a group fed during one, five and ten days after emergence of adults with coffee borer larvae; another group fed only with honey solution during five days after emergence; and as a control, a third group was kept without food for five days. At the end of each treatment, survivorship, parasitoid activity (walking and flying capacity in an arena, search capacity for finding coffee borer-infested berries, host feeding and oviposition (on immature hosts, were assessed. Unfed females showed a significant decrease in survivorship compared to individuals that were fed. The type of meal (insects or honey did not significantly influence parasitoid activity, search and oviposition capacities. Females fed with honey solution significantly consumed less immature coffee borers. Younger females (one day old walked and flew out of the arena significantly faster than older ones (5 and 10 days old. Implications of these results are discussed on the performance of C. stephanoderis as a biological control agent of the coffee berry borer.

  13. Regional sulfate-hematite-sulfide zoning in the auriferous Mariana anticline, Quadrilátero Ferrífero of Minas Gerais, Brazil

    Science.gov (United States)

    Cabral, Alexandre Raphael; Koglin, Nikola; Strauss, Harald; Brätz, Helene; Kwitko-Ribeiro, Rogerio

    2013-10-01

    The distribution of mineral deposits, characterised as barite deposits, hematite-rich auriferous deposits and auriferous tourmaline-sulfide deposits, displays a regional sulfate-hematite-sulfide zoning along the thrust-delineated limbs of the Mariana anticline, in the south-eastern part of the Quadrilátero Ferrífero of Minas Gerais, Brazil. Cross-cut relationships of barite veins and sulfide lodes indicate that sulfidation occurred in a late-tectonic context, which is here attributed to the collapse of the ˜0.6-Ga Brasiliano thrust front. Reconnaissance S-isotopic data from barite and pyrite (Antônio Pereira barite deposit and its adjacent gold deposit, respectively), and arsenopyrite (Passagem de Mariana gold deposit), suggest a new interpretation for the hydrothermal fluid overprint in the Mariana anticline. The Antônio Pereira barite has Δ33S values that are near zero, constraining the sulfate source to rocks younger than 2.45 Ga. The barite-δ34S values are between +19.6 and +20.8 ‰. The Passagem arsenopyrite and tourmaline have Co/Ni ratios that define a positive linear trend with the Antônio Pereira pyrite. The latter has homogenous δ34S values, between +8.8 and +8.9 ‰, which are compatible with thermochemical reduction of aqueous sulfate with the S-isotopic composition of the Antônio Pereira barite.

  14. Captura de enxames de abelhas sem ferrão (Hymenoptera, Apidae, Meliponinae sem destruição de árvores Capturing stingless bee nests (Hymenoptera, Apidae, Meliponinae without destroying the trees

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    Alexandre Coletto-Silva

    2005-09-01

    Full Text Available No Brasil a criação racional de abelhas sem ferrão é denominada meliponicultura. As abelhas sem ferrão possuem diferentes comportamentos de nidificação, com ninhos internos (cavidades naturais ou não e externos. Um dos principais problemas apresentados na meliponicultura é a captura de uma colônia com o objetivo de iniciar um meliponário sem "destruir as árvores" ou mesmo as próprias colônias durante a captura. O presente trabalho apresenta um método alternativo para captura de colônias de abelhas sem ferrão, especialmente, do gênero Melipona Illiger, 1806, que são as espécies mais utilizadas para produção de mel e pólen, na região Amazônica. O método consiste em abrir uma janela na árvore, coletar o material e fechar a abertura utilizando a resina vegetal conhecida como breu.Meliponiculture is the name for stingless beekeeping in Brazil. Stingless bees have different nest behaviors showing external and internal nests (natural cavities or not. One of the main problems of meliponiculture is the capture of a colony in order to begin a meliponary without destroying trees or the colonies during the capture. A new alternative method for the capture of stingless bee colonies is presented for the genus Melipona Illiger, 1806, which are the species mostly used for producing honey and pollen. The method is to open the tree, collect the colony, and then close the tree with natural resins known as "breu".

  15. The shear zone-related gold mineralization at the Turmalina deposit, Quadrilátero Ferrífero, Brazil: structural evolution and the two stages of mineralization

    Science.gov (United States)

    Fabricio-Silva, Wendell; Rosière, Carlos Alberto; Bühn, Bernhard

    2018-05-01

    Turmalina is an important orogenic gold deposit located in the NW region of the Quadrilátero Ferrífero. The deposit is hosted in an Archean greenstone belt composed of ortho-amphibolites and pelites with interleaved tuffs metamorphosed under amphibolite facies conditions and intruded by a granite stock. The orebodies are controlled by WNW-ESE-trending shear zones, associated with hydrothermal alteration. Three deformation events are recognized in the Turmalina gold deposit: D1 and D2 are the result of a progressive Archean deformation under ductile conditions between 2749 ± 7 and 2664 ± 35 Ma; D3 is characterized by a transpressional event under ductile-brittle conditions with the age still unclear. The three generations of garnet observed show that Grt1 blastesis is pre- to syn-D1 and Grt2 growth during the late to post-deformation stages of the D2 event. The initial temperature (Grt1 core) is around 548-600 °C, whereas during late D2, the temperatures reached 633 °C (metamorphic peak-Grt2 rim), likely as a result of granite intrusion. The Grt3 resulted from re-equilibration under retrograde conditions. Two gold-bearing sulfide stages were identified: pyrrhotite-arsenopyrite ± löllingite ± chalcopyrite ± gold stage I precipitated below a metamorphic peak temperature of 598 ± 19 °C associated with S1 foliation (D1), and pyrrhotite-pyrite-arsenopyrite ± chalcopyrite ± gold stage II is located commonly along V3 quartz-carbonate veinlets with a temperature range between 442 ± 9 and 510 ± 30 °C. We suggest that the granite intrusion imposed an additional thermal effect that promoted further dehydration of country rocks. The Au derived mainly from a metamorphic fluid source but potentially mixed with magmatic fluids from the granite.

  16. Desarrollo de los procesos de moldeo por inyección y extrusión de polvos para la obtención de piezas de aceros inoxidables dúplex y ferríticos

    OpenAIRE

    Sotomayor Lozano, María Eugenia

    2011-01-01

    En la presente Tesis Doctoral se ha desarrollado el proceso de moldeo por inyección de polvos (pIM) para la obtención de piezas de acero inoxidable dúplex con aplicaciones en ortodoncia. Por otro lado, se ha desarrollado el proceso de moldeo por extrusión de polvos (PEM) para la obtención de láminas y tubos porosos de acero inoxidable ferrítico con aplicaciones en pilas de combustible de óxido sólido (SOFCs). En primer lugar, se prepararon y caracterizaron térmica y reológicamente las mezclas...

  17. Estudo químico e potencial antioxidante do mel e geoprópolis coletados pela abelha sem ferrão mandaçaia (Melipona mandacaia).

    OpenAIRE

    Paulo Ricardo da Silva

    2015-01-01

    A espécie de abelha sem ferrão Melipona mandacaia é conhecida popularmente como mandaçaia e é nativa do Nordeste brasileiro. Neste estudo foi analisado o mel e a geoprópolis da mandaçaia. Foram realizadas as análises palinológicas, físico-químicas tais como umidade, pH, acidez livre, hidroximetilfurfural, teor de cinzas, açucares redutores e atividade de água, aminoácidos, minerais e atividade antirradicalar em quatro amostras de mel. Os principais constituintes fenólicos do mel foram extraíd...

  18. Diversidade genÃtica da abelha sem ferrÃo melipona quinquefasciata baseada no sequÃnciamento das regiÃes its1 e 18s do dna ribossÃmico nuclear

    OpenAIRE

    JÃlio OtÃvio Portela Pereira

    2006-01-01

    A pesquisa foi desenvolvida no perÃodo de janeiro de 2003 a marÃo de 2006, nos Departamentos de Zootecnia, e Biologia da Universidade Federal do CearÃ, localizada no municÃpio de Fortaleza, estado do CearÃ. As amostras de abelhas foram coletadas nos estados do CearÃ, Piauà e GoiÃs. O objetivo desta tese foi estudar a diversidade genÃtica de populaÃÃes da abelha sem ferrÃo Melipona quinquefasciata, ocorrendo naturalmente na Chapada do Araripe (Sul do CearÃ), na Chapada da Ibiapaba (Oeste do Ce...

  19. Uma maneira prática de distinguir abelhas africanizadas (Apis mellifera L. de abelhas européias usando o estado excitatório central, a mobilidade dos membros e viabilidade do ferrão

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    Italo de Souza Aquino

    2007-06-01

    Full Text Available Uma chave para o entendimento da expansão da abelha africanizada (Apis mellifera é distinguir esta abelha agressiva de sua equivalente européia. Técnicas de identificação atual têm um grau de sucesso, mas cada método tem seu próprio conjunto de problemas, tornando-se proibitivo sua adoção e uso em larga escala. Este estudo examinou aspectos do estado excitatório central, persistência de mobilidade de apêndices e viabilidade da ferroada após decapitação como ferramenta na distinção entre essas duas raças. O estado excitatório central não foi útil na distinção entre a abelha africanizada e a européia; todavia, a mobilidade de apêndices e a viabilidade do ferrão foram significativamente diferentes entre essas duas raças. A mobilidade de apêndices e a viabilidade do ferrão são técnicas úteis na distinção das duas raças e atenua os aspectos relacionados a gastos, aplicação e precisão.

  20. Viabilidade do uso de argilas cauliníticas do Quadrilátero Ferrífero para a indústria cerâmica Availability of the kaolin from Quadrilátero Ferrífero for the ceramic industry

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    M. G. Peralta-Sánchez

    2011-09-01

    Full Text Available Sete amostras compostas, representativas de três ocorrências de argila caulinítica do Quadrilátero Ferrífero, foram caracterizadas física, mineralógica e quimicamente visando seu uso na indústria cerâmica. Apesar da presença predominante de caulinita, variações nos teores de Fe2O3 entre 2 a 44%, refletidos pela presença de goethita e hematita, acarretam diferentes cores que variam entre branco (ACM e DB, amarelo (R5, vermelho amarelado (FS e vermelho (DV, R1 e AM. Corpos cerâmicos foram queimados a 900 e 1100 °C, sendo que as cores praticamente não mudaram após a queima. Entretanto, somente corpos feitos com DV e R1 cumpriram as especificações técnicas para cerâmica, não apresentando fraturas e atingindo altas resistências à compressão: 96,2 MPa e 64,2 MPa, respectivamente. Para as outras amostras foram testadas misturas com filito (F nas proporções de 5, 10, 15, 20 e 25% e queima a 900 e 1100 °C. Os melhores resultados dos corpos cerâmicos, com ausência de fraturas, resistências à compressão entre 69,15 e 29,6 MPa e que cumpriram as especificações técnicas, foram obtidos nas proporções: ACM+15F, DB+5F, R5+5F, FS+5F, AM+5F e queima a 900 ºC.Seven samples from three kaolin deposits of the Quadrilátero Ferrífero were characterized by physical, mineralogical and chemical analyses in order to determine their use in the ceramic industry. Despite the predominant presence of kaolinite, the variations in the Fe2O3 content from 2 to 44%, due to presence of goethite and hematite, resulted in different colors, namely: white (ACM and DB, yellow (R5, yellowed red (FS and red (DV, R1 and AM. Specimens were burned at 900 and 1100 °C and they almost didn't change color. However, only specimens made with DV and R1 samples reached the technical specifications for the ceramic industry, without fractures and with values of compression strength of 96.2 and 64.2 MPa, respectively. The other samples were made by mixing

  1. Composição química e atividade inseticida do óleo essencial de Schinus terebinthifolius Raddi (Anacardiaceae sobre a broca-do-café (Hypothenemus hampei Ferrari

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    M.R.A. Santos

    2013-01-01

    Full Text Available O óleo essencial das folhas de Schinus terebinthifolius foi obtido por hidrodestilação e analisado por CG-EM. O rendimento do óleo foi de 0,8%, sendo identificados 37 constituintes químicos. Os componentes principais foram germacreno D (25,0%, (E-β-cariofileno (17,5% e δ -elemeno (10,5%. O óleo essencial foi diluído em acetona nas concentrações de 10-2 a 10-8 e aplicado aos insetos (Hypothenemus hampei por aplicação tópica e exposição em superfície contaminada. As taxas de mortalidade foram avaliadas após 24 e 48 horas do início do experimento. A aplicação em superfície contaminada resultou em 25% de mortalidade no controle, enquanto nas diluições de 10-2 a 10-8 foram observados 100,0 a 30,0% de mortalidade. Na aplicação tópica, observou-se 27,5% de mortalidade no controle e 97,5 a 77,5% nas diluições de 10-2 a 10-8.

  2. Estudio de la viabilidad de fabricación de un sistema codo (fundición inoxidable ferrítica, GX 260 Cr27-tubo composite (Incolloy 800 HT+Stal 2465 solidario por fusión

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    Gutiérrez de Solabarría, S.

    1995-10-01

    Full Text Available Flying ashes captured by ciclones in the experimental plant for combustion in pressure fluid bed, in Escatrón Power Plant (Zaragoza, Spain, circulate through the gas cleaning system and are evacuated by means of pneumatic transport. The temperature of these ashes is aprox. 800 °C and the relative pressure is up to 8 negative bars relating the outdoor pressure of the transport pipe. The configuration of the pneumatic transport lines is Incolloy 800 HT quality composite tubes lined with Stal 2465 in straight stretches. Regarding direction changes, ferritic stainless casting, quality GX 260 Cr 27 elbows are used. The aim of this work is to study the possibility of manufacturing a solidary system by means of melting between the ferritic stainless casting elbow and the composite pipe.

    Las cenizas volantes captadas por ciclones en la planta experimental de combustión en lecho fluido a presión, de la central térmica de Escatrón (Zaragoza, circulan por el sistema de depuración de gases y son evacuadas mediante transporte neumático. Estas cenizas se encuentran a una temperatura aproximada de 800 °C y a una presión relativa de hasta 8 bares negativos con respecto a la presión en el exterior de la tubería de transporte. Para configurar las líneas de transporte neumático, se utilizan en los tramos rectos tubos composite de calidad Incolloy 800 HT recubiertos interiormente de material Stal 2465. Para los cambios de dirección, se utilizan codos de fundición inoxidable ferrítica de calidad GX 260 Cr 27. El objetivo del presente trabajo es estudiar la viabilidad de fabricación de un sistema solidario por fusión entre el codo de fundición inoxidable ferrítica y la tubería composite.

  3. Uso de productos químicos y biológicos para la degradación de frutos de café en el suelo y su efecto en el desarrollo de la broca del café (hypothenemus hampei) (ferrari)

    OpenAIRE

    Galvez Duque, Astrid Alexandra

    2014-01-01

    Tesis (Especialista en Microbiología Industrial). Universidad Católica de Manizales, Instituto de Investigación en Micriobiología y Biotecnología Agroindustrial, 2014 Los frutos perforados por la broca del café (Hypothenemus hampei) (Ferrari) que caen al suelo después de las cosechas, son la principal fuente de infestación para otros árboles y para las cosechas siguientes. Por esta razón, es necesaria la investigación de nuevas alternativas que reduzcan la sobrevivencia de los est...

  4. Chemical fingerprint of iron oxides related to iron enrichment of banded iron formation from the Cauê Formation - Esperança Deposit, Quadrilátero Ferrífero, Brazil: a laser ablation ICP-MS study

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    Lucilia Aparecida Ramos de Oliveira

    Full Text Available Chemical signatures of iron oxides from dolomitic itabirite and high-grade iron ore from the Esperança deposit, located in the Quadrilátero Ferrífero, indicate that polycyclic processes involving changing of chemical and redox conditions are responsible for the iron enrichment on Cauê Formation from Minas Supergroup. Variations of Mn, Mg and Sr content in different generations of iron oxides from dolomitic itabirite, high-grade iron ore and syn-mineralization quartz-carbonate-hematite veins denote the close relationship between high-grade iron ore formation and carbonate alteration. This indicates that dolomitic itabirite is the main precursor of the iron ore in that deposit. Long-lasting percolation of hydrothermal fluids and shifts in the redox conditions have contributed to changes in the Y/Ho ratio, light/heavy rare earth elements ratio and Ce anomaly with successive iron oxide generations (martite-granular hematite, as well as lower abundance of trace elements including rare earth elements in the younger specularite generations.

  5. Soldagem de um aço inoxidável ferrítico com o processo A-TIG Ferritic stainless steel welding with the A-TIG process

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    Alessandra Gois Luciano de Azevedo

    2009-03-01

    Full Text Available O processo de soldagem TIG com fluxo (processo A-TIG apresenta como principal vantagem a possibilidade de se obter uma maior penetração do cordão de solda empregando os mesmos parâmetros de soldagem do processo TIG convencional. Diversos estudos mostram a influência dos fluxos ativos sobre as características geométricas das soldas em aços inoxidáveis austeníticos, porém pouco se sabe sobre a influência deste processo nas características geométricas e metalúrgicas de cordões de solda em aços inoxidáveis ferríticos. Neste trabalho são aplicados diferentes tipos de fluxo na soldagem de aço inoxidável ferrítico com o objetivo de verificar possíveis influências no perfil do cordão de solda, no seu aspecto visual, na microestrutura, na dureza da zona fundida e na resistência ao impacto (ensaio Charpy. As soldagens "bead-on-plate" foram realizadas sem metal de adição. Foram utilizados seis tipos de fluxo, sendo um óxido elaborado em laboratório (TiO2 e cinco fluxos comerciais. Os resultados mostraram que a utilização do fluxo permite um aumento na penetração com mudanças significativas no aspecto do cordão de solda. Verificou-se ainda que a microestrutura e a dureza do cordão de solda do aço estudado não foram afetadas pelo tipo de fluxo utilizado, com a microestrutura analisada em microscópio óptico. O aço em estudo mostrou um alto grau de fragilidade à temperatura ambiente.The A-TIG welding process presents as main advantage the possibility of increase in the penetration depth using the same parameters as conventional TIG welding. Many researchers show the influence of the active flux on the weld geometry in austenitic stainless steel, however little it is known of the influence of this process in the weld fillet shape and metallurgic characteristics of the weld fillet in ferritic stainless steel. In this work different types of flux are applied with the objective to verify possible influences on the weld

  6. Efecto de la incorporación de Hf en el crecimiento de los recubrimientos de Al sobre aceros ferrítico-martensíticos mediante CVD-FBR

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    Francisco Javier Bolívar

    2010-01-01

    Full Text Available En las últimas décadas, ha habido un marcado interés por aumentar la temperatura y la presión de vapor en las plantas de generación de energía con el propósito de disminuir el consumo de combustibles. Así, se conseguiría reducir las emisiones de contaminantes tales como CO2 SO2 y NOx. Para lograr estas mejoras, se requiere por un lado desarrollar nuevosaceros ferríticos-martensíticos con contenidos de Cr entre 9-12% y por otro lado, mediante la ingeniería de superficies, mejorar la resistencia a la oxidación de los ya existentes. En el presente trabajo se obtuvieron recubrimientos de Al y de Al-Hf y evaluó el efecto de la adición del Hf al lecho sobre el crecimiento de los recubrimientos de Al. Previamente a la obtención de los recubrimientos, se realizó un estudio termodinámico mediante el programa Themocalc y, de acuerdo a los resultados obtenidos, se depositaron las capas de Al y Al-Hf a tres temperaturas diferentes en el rango de 500 a 600 °C. Los recubrimientos fueron caracterizados mediante DRX y MEB/EDAX. De acuerdo con los resultados obtenidos se determinó que para ambos casos las capas estaban fundamentalmente formadas por los compuestos intermetálicos Fe2Al5 y FeAl3.

  7. Perfil sensorial e aceitabilidade de méis de abelhas sem ferrão submetidos a processos de conservação Sensorial profile and acceptability of stingless bee honey submitted to conservation processes

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    Geni da Silva Sodré

    2008-12-01

    Full Text Available O presente trabalho avaliou o perfil sensorial e a aceitabilidade de méis de abelhas sem ferrão submetidos a dois processos de conservação, objetivando obter maior vida de prateleira. Foram utilizadas amostras de méis de Melipona scutellaris e M. quadrifasciata, coletadas no Estado da Bahia entre dezembro de 2005 e janeiro de 2006. As amostras foram submetidas aos processos de pasteurização e desumidificação, passando em seguida por avaliação sensorial. O perfil sensorial foi determinado no Laboratório de Entomologia do Centro de Ciências Agrárias, Ambientais e Biológicas da Universidade Federal do Recôncavo da Bahia, em Cruz das Almas, Estado da Bahia. Os atributos analisados foram: fluidez, cor, aroma, cristalização, sabor e aceitabilidade. Os resultados mostraram que os processos de conservação utilizados não interferem no perfil sensorial e na aceitabilidade do produto.The present work was conducted to evaluate the sensorial profile and the acceptability of the honey of stingless bees submitted to two conservation processes seeking to obtain longer shelf life. The samples of Melipona scutellaris and M. quadrifasciata honey were collected in the State of Bahia, Brazil, between December 2005 and January 2006. The samples were first submitted to pasteurization and dehumidification processes and then to sensorial evaluation. The sensorial profile was determined in the Laboratory of Entomology in the Center for Agrarian, Biological, and Environmental Sciences of the Federal University of Recôncavo Bahiano, in Cruz das Almas, in the state of Bahia. The analyzed attributes were: fluidity, color, scent, crystallization, flavour, and acceptability. The results show that the conservation processes used do not interfere with the sensorial profile and the product acceptability.

  8. Five egg-laying queens in a single colony of brazilian stingless bees (Melipona scutellaris Latreille Presença de cinco rainhas fisogástricas em colônia de abelha sem ferrão (Melipona scutellaris Latreille

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    Carlos Alfredo Lopes de Carvalho

    2011-03-01

    Full Text Available Polygyny, characterized by the presence of several egg-laying queens, is considered as a temporary colony status. In stingless bees it is rarely observed. This paper reports the first case of natural polygyny in Melipona scutellaris colony, with five egg-laying queens.Poliginia, caracterizada pela presença de mais de uma rainha poedeira, é considerada como uma condição temporária em colônias. Em abelhas sem ferrão isso é raramente observado. Este artigo registra o primeiro caso de poliginia natural em colônia de Melipona scutellaris, com cinco rainhas poedeiras.

  9. Las Teorías de Elton Mayo, La Teoría de las Necesidades Humanas de Abrahan Maslow para Desarrollar las Relaciones Interpersonales, En La Institución Educativa Nº 10103 “Carmen Rosa Fernández Barrera” Del Caserío La Capilla – Pueblo Nuevo - Ferreñafe

    OpenAIRE

    Duran Chambergo, Elizabeth; Ugaz Castillo, Gustavo

    2017-01-01

    El objetivo del trabajo es diseñar estrategias para mejorar las relaciones interpersonales de los directivos y docentes de la Institución Educativa Nº 10103 “Carmen Rosa Fernández Barrera” del Caserío la Capilla – Pueblo Nuevo – Ferreñafe, que permita mejorar la gestión institucional, cuyos indicadores dan cuenta de: a) ineficientes relaciones interpersonales, b) equivocados estilos de dirección, c) falta de comunicación laboral, d) exiguas retribuciones y e) escasa disponibilidad de espacios...

  10. Physicochemical aspects and sensory profile of stingless bee honeys from Seridó region, State of Rio Grande do Norte, BrazilAspectos físico-químicos e perfil sensorial de méis de abelhas sem ferrão da região do Seridó, Estado do Rio Grande do Norte, Brasil

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    Janaína Maria Batista Sousa

    2013-09-01

    Full Text Available Stingless bee honey is a highly valued product of the Seridó region, state of Rio Grande do Norte due to its specific sensory and nutritional characteristics. The objective of this study was to evaluate the physicochemical and sensory profile of stingless bee honeys produced in the Seridó region, state of Rio Grande do Norte. Twenty-nine honey samples from the following stingless bees were analyzed: M. subnitida D., Frieseomellita doederleini F., Melipona scutellaris L., Frieseomellita flavicornis, Scaptotrigrona SP, Nannotrigona testaceicornis L., Melipona compressipes fasciculada S., Melipona quadrifasciata Lep, Melipona quinquefasciata, M. scutellaris L. and Partamona helleri F. The composition considering moisture, total sugars, reducing sugars, apparent sucrose, protein, vitamin C, and ash, and the total acidity, pH, and color were evaluated. A sensory profile, considering the aroma, color, viscosity, flavor, acidity attributes and general acceptability, and the acceptability, regarding aroma, color and flavor, were also analyzed. The honeys were different (p O mel de abelhas sem ferrão é um produto bastante valorizado na região do Seridó do Rio Grande do Norte, em função de suas características nutritivas e sensoriais específicas. O objetivo do presente estudo foi avaliar os aspectos físico-químicos e perfil sensorial de méis de abelhas sem ferrão produzidos na região do Seridó do Rio Grande do Norte. Foram analisadas 29 amostras de mel das seguintes abelhas sem ferrão: M. subnitida D., Frieseomellita doederleini F., Melipona scutellaris L., Frieseomellita flavicornis, Scaptotrigrona SP, Nannotrigona testaceicornis L., Melipona compressipes fasciculada S., Melipona quadrifasciata Lep, Melipona quinquefasciata, M. scutellaris L. e Partamona helleri F. Os aspectos físico-químicos analisados foram: umidade, açúcares totais, açucares redutores, sacarose aparente, cinzas, acidez total, pH, proteína, vitamina C e cor

  11. Contradições da política ambiental por meio de incentivos financeiros: os casos do ICMS ecológico e da CFEM nos municípios do Quadrilátero Ferrífero (Minas Gerais, Brasil)

    OpenAIRE

    Euclydes, Ana Carolina Pinheiro

    2013-01-01

    A partir do levantamento dos valores recebidos pelos municípios situados na região do Quadrilátero Ferrífero, em Minas Gerais, em decorrência do ICMS Ecológico, repassado pelo Estado e da Compensação Financeira pela Exploração de Recursos Minerais (CFEM) recebida da União, este artigo relativiza o potencial do ICMS Ecológico para incentivar os municípios mineradores a criarem ou apoiarem unidades de conservação (UCs) em seus territórios. Nesta discussão, trazem-se à tona avaliações técnicas e...

  12. Microestrutura de uma Solda Dissimilar entre o Aço Inoxidável Ferrítico AISI 410S e o Aço Inoxidável Austenítico AISI 304L Soldado pelo Processo FSW

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    Tathiane Caminha Andrade

    2015-12-01

    Full Text Available Resumo O presente trabalho visa investigar a microestrutura formada na soldagem dissimilar entre chapas de aços inoxidáveis ferríticos AISI 410S e aços inoxidáveis austeníticos AISI 304L pelo processo friction stir welding. A soldagem foi realizada com o ajuste dos seguintes parâmetros: rotação 450 rpm; velocidade de soldagem de 1,0 mm/s; e força axial 40 kN. O aço AISI 410S foi posicionado no lado de avanço enquanto que o aço AISI 304L foi posicionado no lado de retrocesso. A análise consistiu de preparação metalográfica e caracterização microestrutural por microscopia ótica e microscopia eletrônica de varredura. Para o aço AISI 410S foi observada a formação de martensita associada com ferrita na zona de mistura (ZM, zona termomecanicamente afetada (ZTMA e na zona afetada pelo calor (ZAC. As características do processo de soldagem FSW resultaram num refino de grão para o aço inoxidável ferrítico, posicionado no lado de avanço, tanto na ZM quanto nas ZTMA e ZAC. O mesmo comportamento não foi observado para o lado austenítico.

  13. Influencia de la temperatura de austenización y tiempo de permanencia sobre el tamaño de grano en aceros ferrítico-martensíticos del tipo 9Cr1MoVNb utilizados en calderas supercríticas

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    Gutiérrez-Urrutia, L.

    2001-04-01

    Full Text Available The aim of the present work is to determine the influence of austenitizing temperature holding time and heating velocity on grain size of ferritic-martensitic type 9CrlMoVNb steels developed for Oak Ridge National Laboratories & Combustion Engineering, T91/P91[1] Steels (USA and X10CrMoVNb 9.1 (Europe. The potential benefits of this material, in term of high resistance, good ductily and oxidation resistance, weldability and in particular good high temperature creep strength, are now widely acknowledged, particulary by supercritical boilers (P = 300 bar, T = 550±50 °C. The studied steels have been produced in, high frecuency induction vacum furnaces and hot-rolled.

    Se estudia la influencia de la temperatura de austenización, tiempo de permanencia a esta temperatura y velocidad de calentamiento sobre el tamaño de grano de varios aceros ferrítico-martensíticos de última generación del tipo 9CrlMoVNb, desarrollados por Oak Ridge National Laboratories (ORNL conjuntamente con Combustion Enginering en USA, conocidos por ASME/ASTM por las designaciones T91/P91[1] y en Europa como X10CrMoVNb9.1. Son aceros ductiles y tenaces que presentan muy buenas propiedades de resistencia a fluencia, soldabilidad y conductividad térmica. Son cada vez más utilizados como tubos de alta temperatura (550±50 °C y presión (300 bar en calderas supercríticas para centrales térmicas avanzadas. Los aceros estudiados se han fabricado en hornos de inducción de alta frecuencia al vacío y laminados en caliente.

  14. Influencia de la composición y tratamiento térmico sobre el comportamiento a fluencia de aceros ferrítico-martensíticos del tipo 9Cr1MoVNb utilizados en calderas supercríticas

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    Gutiérrez Urrutia, I.

    2000-06-01

    Full Text Available In the present investigation, creep behaviour on various ferritic-martensitic steels (type 9Cr1MoVNb from last generation were studied. They’re amply used as high pressure and temperature tubes in supercritical boilers for advanced thermoelectric plant. The material used was produced with vacuum high frecuency induction furnace hot-rolling followed by normalizing plus and tempering heat treatments. Creep testing carry out with different stress (also constant lower than yield strength (σ < Re and temperatures at 600±50ºC. Influence by variation of some chemical elements (B, Ti, V, Nb, V, C, as well assessment Larson-Miller, Manson-Haferd and Orr-Sherby-Dorn parameters, they’re likewise studied.

    Se estudia el comportamiento a fluencia de varios aceros ferrítico-martensíticos de última generación, del tipo 9Cr1MoVNb, que son ampliamente utilizados como tubos presurizados de alta temperatura en calderas supercríticas para centrales térmicas avanzadas de producción de energía eléctrica. El material utilizado fue fabricado en hornos de inducción de alta frecuencia y al vacío, laminado en caliente y posteriormente aplicado diferentes tratamientos térmicos de Normalizado y Revenido. En los ensayos de fluencia se aplicaron diferentes y ctes. σ < Re y temperaturas de 550, 600 y 650º C. La influencia de la variación de determinados elementos (C, N, V, Nb, Ti, B de su composición química así como observar los valores que toman los parámetros de Larson-Miller, Manson-Haferd y Orr-Sherby-Dorn, son asimismo contemplados.

  15. Ferréol Gilles (Dir., Tourisme et patrimoine

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    Régis Malige

    2011-09-01

    Full Text Available Le développement de l’activité touristique constitue un excellent vecteur de découverte et de valorisation d’éléments patrimoniaux. La profusion de littérature sur le sujet, le rôle capital des médias et le succès des manifestations officielles expliquent largement l’intérêt croissant du public pour les monuments, les savoir-faire, les traditions ou les festivités. Témoin d’échanges fructueux entre enseignants-chercheurs, docteurs ou doctorants, professionnels, responsables associatifs et élu...

  16. The role of semiochemical traps in the management of coffee berry borer Hypothenemus hampei/ O papel das armadilhas com semioquímicos no manejo da broca-do-café,Hypothenemus hampei

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    Lauro Morales

    2006-06-01

    Full Text Available The Coffee berry borer (CBB is the most important pest in the coffee plantings. Losses are due to quality and quantity reductions. In most plantings, CBB is controlled using insecticides. Alternative management strategies are strongly demanded due to increasing production and demand for organic products. This paper revises the use of traps for CBB management. Color and trap designs, attractants and release rates are the factors directly related to trap efficiency. Methanol and ethanol mixture is used as attractant. Interactions among these factors in the CBB attraction are reported. Environment conditions under which the coffee plantings are conducted influence trap captures. These aspects may explain some differences in results for different studies. Conflicting results are also found in relation to traps efficiency when they are used as a unique control strategy in the field. Additional research may be encouraged to understand more deeply the interactions between the CBB and coffee plant. In the same way, we must study the interactions of the several intrinsic factors of the traps and the environment. The use of the trap, associated with other strategies to reduce pest population, is a recommended strategy for CBB management.A broca-do-café é a praga mais importante do cafeeiro. Provoca prejuízos em quantidade e qualidade da produção. Normalmente, é controlada por aplicações de inseticidas. Estratégias alternativas de manejo são necessárias principalmente pelo aumento da produção e demanda por produtos orgânicos. O uso de armadilhas para manejo da broca é revisado. A cor, o modelo da armadilha, os atraentes e as taxas de liberação são fatores diretamente relacionados com a eficiência das armadilhas. Metanol e etanol são os compostos utilizados como atraentes. Ocorrem interações entre estes fatores na atração da broca. As condições ambientais nas quais o cafeeiro é cultivado também devem influenciar as capturas. Estes aspectos podem explicar algumas diferenças em resultados de alguns estudos. Resultados conflitantes também são verificados no que se refere à eficiência das armadilhas quando utilizadas como estratégia única de controle no campo. Pesquisas adicionais devem ser incentivadas para entender com mais profundidade as interações entre a broca e a planta de café. Da mesma forma, deve-se estudar as interações dos vários fatores intrínsecos das armadilhas e destes fatores com o ambiente no qual a armadilha será instalada. O uso das armadilhas, associadas a outras estratégias de redução populacional da praga, é prática recomendável para manejo da broca.

  17. Efecto de la Profundidad sobre la Soldabilidad de Aceros Ferríticos en Ambientes Simulados Unidos por Soldadura Húmeda

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    Fernando Macías López

    Full Text Available Resumen El objetivo de este trabajo fue evaluar el efecto de la profundidad sobre las propiedades en soldaduras de ranura en “V” con varios cordones de relleno. Metal base y electrodos comerciales fueron utilizados (ASTM A36 y AWS E7014 y cuatro diferentes condiciones se utilizaron para desarrollar las soldaduras húmedas como son 10, 20, 30 y 40m de profundidad. Una cámara presurizada con 30 atmósferas de capacidad fue utilizada para simular la profundidad, inundada con agua fresca. Un buzo soldador fue quien realizo las soldaduras. Las propiedades en la sección transversal mediante pruebas de tenacidad CVN (Charpy V-notch, macro ataque y esfuerzo a la tensión fueron determinadas por correlación. Las pruebas mecánicas con mejores resultados se observaron en la condición de 20m de profundidad.

  18. Evaluación de extractos vegetales para el control de la broca del café (Hypothenemus hampei, ferrari)

    OpenAIRE

    Niño Osorio, Jaime; Correa N., Yaned Milena; Mosquera M., Oscar M.; Bustamante Peláez, Angélica María

    2007-01-01

    Este trabajo describe la evaluación por antibiosis de la actividad antibroca de 21 extractos metanólicos de las plantas recolectadas en la Reserva Natural Bremen-La Popa (Quindío). Los bioensayos se realizaron bajo condiciones controladas (23 ± 3 ºC; 75 ± 5 % H.R.), utilizando como unidad experimental (UE) un tubo eppendorf al interior del cual se transfirió un grano de café pergamino impregnado del respectivo extracto a 1000 mg/L y una hembra adulta de broca. Se hicieron 90 UE por cada extra...

  19. Abelhas-sem-ferrão amazônicas defendem meliponários contra saques de outras abelhas Amazonian stingless bees protect meliponaries against robber bees

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    André Rodrigo Rech

    2013-09-01

    Full Text Available Entre as abelhas eussociais, dois gêneros apresentam estratégia de vida cleptobiótica, obtendo recursos alimentares de ninhos de outras abelhas ao invés de coletá-los em flores. Entre as espécies atacadas existe um gradiente de suscetibilidade ao roubo variando desde espécies vulneráveis até altamente resistentes. Neste trabalho nós descrevemos um ataque de Lestrimelitta rufipes a um ninho de Scaptotrigona sp. em um meliponário na Amazônia central (Amazonas, Brazil. O ninho atacado foi transferido para um meliponário com espécies resistentes (Duckeola ghilianii e Melipona fulva e as interações foram descritas. As abelhas resistentes contra-atacaram e afugentaram as ladras protegendo o ninho de Scaptotrigona sp.. A presença de comportamento defensivo em gêneros não proximamente relacionados sugere que ele tenha evoluído mais de uma vez entre os Meliponini. Considerando o comportamento descrito, sugerimos a criação de espécies nativas resistentes em meliponários de regiões onde elas forem nativas, devido ao potencial que elas tem na proteção.Among eusocial bees, two genera evolved a cleptobiotic life strategy, stealing food resources from other bee nest instead of collecting it from flowers. Under natural conditions there is a gradient of strategies against robbing, from more susceptible to highly resistant species. In this work, we describe one attack of the robber bee Lestrimelitta rufipes to a nest of Scaptotrigona sp. in the Amazon Rain Forest (Amazonas, Brazil. The attacked nest was introduced in a beekeeping area with bees already known to be resistant to cleptobiosis. The resident bees (Duckeola ghilianii and Melipona fulva counter-attacked the robber bees and successfully protect the Scaptotrigona sp. nest. The presence of the defensive behaviour in unrelated genera suggests it evolved many times in social bees. Based on the protective behaviour described here, we suggest that in order to reduce the damage caused by Lestrimelitta attacks in Amazonian beekeeping, a combination of defensive and non-resistant bees should be considered.

  20. A new species of Hatchet-faced Treefrog Sphaenorhynchus Tschudi (Anura: Hylidae) from Quadrilátero Ferrífero, Minas Gerais, southeastern Brazil.

    Science.gov (United States)

    Araujo-Vieira, Katyuscia; Lacerda, João Victor A; Pezzuti, Tiago L; Leite, Felipe Sá Fortes; De Assis, Clodoaldo Lopes; Cruz, Carlos Alberto G

    2015-12-21

    A new species of Sphaenorhynchus is described from the Municipality of Mariana, State of Minas Gerais, Brazil. It is characterized by the vocal sac moderately developed, single, subgular, with longitudinal folds; white canthal and dorsolateral lines delimited below by a dorsolateral black line from the tip of snout extending beyond the eye to gradually disappearing up to the flanks; and premaxilla and maxilla almost completely edentulous, each bearing 1-5 extremely small teeth. It is most similar with Sphaenorhynchus orophilus, from which it can be distinguished by having a less robust forearm in males; glandular subcloacal dermal fold; premaxilla and maxilla almost completely edentulous; and larvae with large marginal papillae in the oral disc. The new species occurs in natural ponds over ironstone outcrops (known as canga) on flat terrain, where males call from the floating vegetation.

  1. Abelhas sem ferrão (Hymenoptera: Apidae, Meliponini da Estação Ecológica de Água Limpa, Cataguases-MG, Brasil.

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    Hugo Werneck

    2014-08-01

    Stingless Bees of the Estação Ecológica de Água Limpa, Cataguases-MG, Brazil Abstract. This study carried out a survey of nests of stingless bees present in the Estação Ecológica de Água Limpa (EEAL in the municipality of Cataguases, Minas Gerais. We found twenty-one nests belonging to nine species: Friesella schrottkyi (Friese, Melipona bicolor Lepeletier, Plebeia sp. 1, Plebeia sp. 2, Tetragona clavipes (Fabricius, Tetragona quadrangula (Fabricius, Tetragonisca angustula (Latreille, Trigona hyalinata (Lepeletier, Trigona spinipes (Fabricius. Twenty of the 21 nests were found in arboreal substrate. The fauna of stingless bees observed in EEAL is represented by a low number of species. Although the local vegetation has the potential to provide substrates for nesting and floral resources, the low species richness may be related to the fact that the EEAL is an isolated forest remnant.

  2. Valor nutricional do mel e pólen de abelhas sem ferrão da região Amazônica

    OpenAIRE

    Souza,Rosa Cristina da Silva; Yuyama,Lucia Kiyoko Ozaki; Aguiar,Jaime Paiva Lopes; Oliveira,Francisco Plácido Magalhães

    2004-01-01

    Avaliou-se os constituintes nutricionais de amostras do mel e pólen das espécies Melipona seminigra merrillae (jandaíra), Melipona compressipes manaosensis (jupará), Melipona rufiventris paraensis (uruçu boca de ralo), provenientes do meliponário da Fazenda Poranga no município de Itacoatiara - AM e Meliponário Abelhudo em Manaus - AM. Os resultados demonstraram o potencial do mel como fonte de energia, particularmente a M. rufiventris com 305,3±2,4 kcal em 100g. O pólen da espécie M. compres...

  3. Interações agressivas em abelhas sem ferrão: Melipona quadrifasciata (Lepeletier invadindo ninho de Scaptotrigona bipunctata (Lepeletier

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    2015-08-01

    Abstract. This record describes the occurrence of conflicts between stingless bees of an active colony of Scaptotrigona bipunctata (Lepeletier and individuals of Melipona quadrifasciata (Lepeletier, and discusses possible hypotheses that motivated the attack. Behaviors were observed in an active colony of S. bipunctata. The active nest guards detained individuals of M. quadrifasciata who invaded the colony. The chances of misidentification of the colony entrance and error in the species possible aggregation were discarded, however, the hypothesis of the real invasion recorded in this study demonstrates a behavioral strategy by M. quadrifasciata suggests that there is an energy savings if successful in looting.

  4. Ideology in Literature: Images of Social Relationships within Puerto Rico's Historical Context in "Isolda's Mirror," a Short Story by Rosario Ferre.

    Science.gov (United States)

    Gutierrez, Mariela

    1992-01-01

    Discusses the ideology contained in Caribbean literature as influenced by Marxism, feminism, politics, and the fragmented sociopolitical history of the region. Examines the short story "Isolda's Mirror" as it relates to the new socioeconomic system in Puerto Rico caused by industrialization and the resulting political and economic…

  5. Recent occurrence of Aphanogmus dictynna (Waterston) (Hymenoptera: Ceraphronidae) in Kenya – an important hyperparasitoid of the coffee berry borer Hypothenemus hampei (Ferrari) (Coleoptera: Scolytidae)

    Science.gov (United States)

    Aphanogmus dictynna (Waterston) was recently recorded in error as an undescribed species of Aphanogmus. This species is a primary parasitoid on larvae and cocoons of the bethylid Prorops nasuta Waterston, and probably a second bethylid species, Cephalonomia stephanoderis Betrem. Both bethylids are...

  6. Efecto de cinco Dosis de Heterorhabditis indica Poinat cepa P2M sobre la broca del café (Hypothenemus hampei Ferrari).

    OpenAIRE

    Yander Fernández Cancio; Marcos Tulio García González; Manuel Rodríguez González

    2015-01-01

    Con el objetivo de evaluar el efecto de Heterorhaditis indica cepa P2M en el manejo de la broca del café (Hypotenemushampei Ferrari) se realizó la investigación en condiciones controladas en el Laboratorio Provincial de Sanidad Vegetal de Sancti Spíritus con cinco dosis del patógeno: 20, 45, 75, 100 y 200 individuos juveniles infestiles/adulto (iji/adulto). Se diseñaron dos experimentos: variante 1 con aplicaciones directa sobre los adultos del insecto en placas Petri con siete repeticiones y...

  7. Molecular diagnosis of a previously unreported predator-prey association in coffee: Karnyothrips flavipes Jones (Thysanoptera: Phlaeothripidae) predation on the coffee berry borer

    Science.gov (United States)

    Jaramillo, Juliana; Chapman, Eric G.; Vega, Fernando E.; Harwood, James D.

    2010-03-01

    The coffee berry borer, Hypothenemus hampei, is the most important pest of coffee throughout the world, causing losses estimated at US 500 million/year. The thrips Karnyothrips flavipes was observed for the first time feeding on immature stages of H. hampei in April 2008 from samples collected in the Kisii area of Western Kenya. Since the trophic interactions between H. hampei and K. flavipes are carried out entirely within the coffee berry, and because thrips feed by liquid ingestion, we used molecular gut-content analysis to confirm the potential role of K. flavipes as a predator of H. hampei in an organic coffee production system. Species-specific COI primers designed for H. hampei were shown to have a high degree of specificity for H. hampei DNA and did not produce any PCR product from DNA templates of the other insects associated with the coffee agroecosystems. In total, 3,327 K. flavipes emerged from 17,792 H. hampei-infested berries collected from the field between April and September 2008. Throughout the season, 8.3% of K. flavipes tested positive for H. hampei DNA, although at times this figure approached 50%. Prey availability was significantly correlated with prey consumption, thus indicating the potential impact on H. hampei populations.

  8. Molecular Markers Detect Cryptic Predation on Coffee Berry Borer (Coleoptera: Curculionidae) by Silvanid and Laemophloeid Flat Bark Beetles (Coleoptera: Silvanidae, Laemophloeidae) in Coffee Beans.

    Science.gov (United States)

    Sim, Sheina B; Yoneishi, Nicole M; Brill, Eva; Geib, Scott M; Follett, Peter A

    2016-02-01

    The coffee berry borer, Hypothenemus hampei (Ferrari) (Coleoptera: Curculionidae), is a serious pest of coffee worldwide. It was first detected in Hawai'i in 2010. Two predatory beetles, Cathartus quadricollis (Coleoptera: Silvanidae) and Leptophloeus sp. (Coleoptera: Laemophloeidae), have been observed in H. hampei-infested coffee. Under laboratory conditions, colony-reared C. quadricollis and Leptophloeus sp. prey upon all life stages of H. hampei. However, the H. hampei life cycle occurs almost exclusively within a coffee bean obscured from direct observation. Thus, it is unknown if C. quadricollis and Leptophloeus sp. consume H. hampei as prey in the wild. To demonstrate predation of H. hampei by C. quadricollis and Leptophloeus sp., a molecular assay was developed utilizing species-specific primers targeting short regions of the mitochondrial COI gene to determine species presence. Using these primers, wild C. quadricollis and Leptophloeus sp. were collected and screened for the presence of H. hampei DNA using PCR. Analysis of collections from five coffee farms revealed predation of C. quadricollis and Leptophloeus sp. on H. hampei. Further laboratory testing showed that H. hampei DNA could be detected in predators for as long as 48 h after feeding, indicating the farm-caught predators had preyed on H. hampei within 2 d of sampling. This study demonstrates the utility of molecular markers for the study of the ecology of predators and prey with cryptic behavior, and suggests C. quadricollis and Leptophloeus sp. might be useful biocontrol agents against H. hampei. Published by Oxford University Press on behalf of Entomological Society of America 2015. This work is written by US Government employees and is in the public domain in the US.

  9. Biological control of coffee berry borer: the role of DNA-based gut-content analysis in assessment of predation

    Science.gov (United States)

    The coffee berry borer, Hypothenemus hampei, is the most important pest of coffee worldwide, causing an estimated $500 million in damage annually. Infestation rates from 50-90% have been reported, significantly impacting coffee yields. Adult female H. hampei bore into the berry and lay eggs whose la...

  10. Constituintes fenólicos e atividade antioxidante da geoprópolis de duas espécies de abelhas sem ferrão amazônicas

    Directory of Open Access Journals (Sweden)

    Ellen Cristina Costa da Silva

    2013-01-01

    Full Text Available We investigated the phenolic constituents and antioxidant activity of geopropolis from two species of stingless Amazonian bees, Melipona interrupta and Melipona seminigra. The chemical investigation of geopropolis from Melipona interrupta led to the isolation of 5,7,4'-trihydroxyflavonone, 3,5,6,7,4'-pentahydroxyflavonol, naringenine-4'-O-b-D-glucopyranoside and myricetin-3-O-b-D-glucopyranoside. Their structures were assigned based on spectroscopic analyses, including two-dimensional NMR techniques. Antioxidant activity of methanol and ethanol extracts of M. interrupta and M. seminigra were measured using the 1,2-diphenyl-2-picryl-hydrazyl (DPPH free radical scavenging assay. This is also the first work reporting the chemical investigation of stingless bee species from the Amazonian region.

  11. Atividade antimicrobiana de méis de cinco espécies de abelhas brasileiras sem ferrão Antimicrobial activity of honey from five species of Brazilian stingless bees

    Directory of Open Access Journals (Sweden)

    Manuela Dória Mercês

    2013-04-01

    Full Text Available A atividade antimicrobiana de méis produzidos por Melipona asilvai, Melipona quadrifasciata anthidioides, Friseomelita doederleinei, Tetragonisca angustula e Plebeia sp. foi investigada. O teste de difusão em poço demonstrou que todos os méis tem ação antibacteriana frente a Staphylococcus aureus, mas somente as amostras produzidas por M. quadrifasciata anthidioides e F. doederleinei inibiram o crescimento de Escherichia coli. No ensaio de determinação da concentração inibitória mínima, os méis de M. asilvai, M. quadrifasciata anthidioides, F. doederleinei e T. angustula foram mais ativos que os de Plebeia sp. frente a S. aureus e E. coli. Os micro-organismos Pseudomonas aeruginosa e Candida albicans foram resistentes a todos os méis em ambos ensaios. Os méis foram mais efetivos contra as bactérias do que frente a uma solução de açúcar, sugerindo que o mecanismo de inibição do crescimento bacteriano não está somente relacionado ao efeito osmótico. Os resultados obtidos podem explicar o uso medicinal desses méis em doenças bacterianas.The antimicrobial activity of honey produced by Melipona asilvai, Melipona quadrifasciata anthidioides, Friseomelita doederleinei, Tetragonisca angustula and Plebeia sp. were investigated. The agar well diffusion assay demonstrated that all honeys had antibacterial activity against Staphylococcus aureus, but only the samples from M. quadrifasciata anthidioides and F. doederleinei inhibited the growth of Escherichia coli. In the Minimum Inhibitory Concentration determination assay, M. asilvai, M. quadrifasciata anthidioides, F. doederleinei and T. angustula honeys were more active than that from Plebeia sp. for S. aureus and E. coli. The microorganisms Pseudomonas aeruginosa and Candida albicans were resistant to the all native stingless bee honeys in both assays. Honeys were more effective against bacteria than a sugar solution, suggesting that the mechanism for bacterial growth inhibition is not only related to the osmotic effect. The results of antimicrobial activity may explain the popular medicinal use of these honeys in bacterial diseases.

  12. Hydrothermal fluid source constrained by Co/Ni ratios in coexisting arsenopyrite and tourmaline: the auriferous lode of Passagem, Quadrilátero Ferrífero of Minas Gerais, Brazil

    Science.gov (United States)

    Cabral, Alexandre Raphael; Koglin, Nikola

    2012-03-01

    The auriferous lode of Passagem de Mariana is characterised by abundant tourmaline, which is intergrown with arsenopyrite. Spot measurements using laser ablation-inductively coupled plasma-mass spectrometry show that Co and Ni are the most abundant trace elements in the arsenopyrite (45-538 ppm Co, 246-828 ppm Ni), with Co/Ni ratios consistently <1. The coexisting tourmaline also has Co/Ni <1, with Co and Ni contents that are ~2 orders of magnitude lower than those in the arsenopyrite. The Co/Ni ratios of tourmaline and arsenopyrite are tightly distributed along a positive linear trend, the angular coefficient of which represents the Co/Ni of the hydrothermal fluid from which these minerals precipitated. The fluid Co/Ni ratio is close to the average Co/Ni value for the upper continental crust. In conjunction with the abundance of lode tourmaline and its B-isotope data (from the literature), the Co/Ni ratios of tourmaline and arsenopyrite fingerprint a continental evaporitic source of B.

  13. Das amarras do poder às entrelinhas do discurso: a pedagogia ambígua da favela em Capão Pecado, de Ferréz

    Directory of Open Access Journals (Sweden)

    Juan Filipe Stacul

    2016-12-01

    Full Text Available Pretende-se, no presente trabalho, investigar como o narrador de Capão Pecado propõe um contraponto ao código de moral da marginalidade, assumindo um tom pedagógico ambíguo que, ao mesmo tempo, critica o “sistema” e valoriza as regras de moralidade por este pregoadas. Para tal análise, pretende-se relacionar a instância narrativa da obra em questão com os pressupostos teóricos de Michel Foucault sobre a dissolução das relações de poder, representada pela figura do panóptico. Verifica-se, com isso, que os valores morais da sociedade tradicional burguesa dissolvem-se nas mais diversas estruturas, diluindo, nesse processo, algumas fronteiras entre centro e margem para se estabelecer como norma até mesmo onde são questionados e subvertidos.

  14. Termorregulação colonial e a influência da temperatura no desenvolvimento da cria em abelhas sem ferrão, Melipona scutellaris (Hymenoptera, Apidae, Meliponini)

    OpenAIRE

    Yara Sbrolin Roldão

    2011-01-01

    Uma característica dos insetos sociais, entre elas as abelhas, é o controle da temperatura de seus ninhos. Abelhas sociais são denominadas como animais heterotérmicos, ou seja, são endotérmicas quando realizam atividades motoras (adultas) e ectotérmicas quando apresentam inatividade (cria e abelhas jovens). Essa característica está entrelaçada com o comportamento social. As abelhas melíferas (Apidae; Apini: Apis mellifera) são conhecidas por apresentarem uma temperatura ótima dentro de seus n...

  15. Onde os mais Adaptados Permanecem: Comunidade de Abelhas sem Ferrão (Hymenoptera: Apidae, Meliponini em Áreas Urbanas do Município de Ubá, Minas Gerais, Brasil

    Directory of Open Access Journals (Sweden)

    Gustavo Araújo

    2016-12-01

    Where the most Adapted Remain: Stingless Bees Community (Hymenoptera: Apidae, Meliponini in Urban Areas of the City of Uba, Minas Gerais, Brazil Abstract. The urbanization has caused the fragmentation of various natural environments, taking to loss of many ecological processes in which includes pollination, realized mainly by bees, in special Meliponini species, which has drastically reduced their populations due to loss of habitat for urban expansion. The aim of this study was to survey the species of stingless bees in urban areas of the municipality of Ubá - MG, Brazil, relate the richness and abundance of species found with the percentage of occupation of the structural variables of the urban landscape and relate the presence of the species obtained with these variables. Were found 28 nests belonging to four species, Tetragonisca angustula (Latreille, Trigona spinipes (Fabricius, Nannotrigona testaceicornis (Lepeletier and Friesella schrottkyi (Friese. There was no significant relationship between richness and abundance of Meliponini and structural variables of vegetation, possibly due to low values in the number of nests and species obtained. Only T. spinipes showed related to the presence of vegetation. The results show that the Meliponini community is composed by generalist species able to use artificial cavities and ornamental plants as an alternative source of resources, common in urban areas. The results obtained in this study is a warning to current conditions of the plant remaining in urban areas in the city of Ubá, besides may also be used as support in taking-decision on projects for the conservation and recovery of degraded areas, focusing on bees and their importance to the sustainability of these ecosystems.

  16. Valor nutricional do mel e pólen de abelhas sem ferrão da região Amazônica Nutricional value of honey and pollen of stingerless bees of the Amazonian region

    Directory of Open Access Journals (Sweden)

    Rosa Cristina da Silva Souza

    2004-01-01

    Full Text Available Avaliou-se os constituintes nutricionais de amostras do mel e pólen das espécies Melipona seminigra merrillae (jandaíra, Melipona compressipes manaosensis (jupará, Melipona rufiventris paraensis (uruçu boca de ralo, provenientes do meliponário da Fazenda Poranga no município de Itacoatiara - AM e Meliponário Abelhudo em Manaus - AM. Os resultados demonstraram o potencial do mel como fonte de energia, particularmente a M. rufiventris com 305,3±2,4 kcal em 100g. O pólen da espécie M. compressipes apresentou a maior concentração de proteína 15,7±0,0% e energia 309,8±0,8 kcal. Tais constatações sugerem a implementação de novos estudos visando à incorporação destes produtos na dieta dos amazônidas, possibilitando uma nova fonte alternativa de alimento potencialmente nutritivo e saudável.We evaluated the nutricional constituent of honey and pollen samples of the Melipona species seminigra merrillae (jandaíra Melipona compressipes manaosensis (jupará, Melipona rufiventris paraensis (uruçu boca de ralo, proceeding from the Poranga Honey Farm in Itacoatiara - AM, and Meliponário Abelhudo in Manaus, AM. The results demonstrated the potencial of honey as a source of energy, particularly the kcal M. rufiventris with 305.3±2.4 kcal in 100g. The compressis pollen of species presented the highest concentration of protein 15.7±0.0 % and energy 309.8±0.8 kcal. Thus we suggest the implementation of new studies aiming at the incorporation of these products in the diet of the Amazon population, making possible a new potentially nutritional and alternative healthful food source.

  17. Abundância, Distribuição Espacial de Ninhos de Abelhas Sem Ferrão (Apidae: Meliponini e Espécies Vegetais Utilizadas para Nidificação em um Fragmento de Floresta Secundária em Rio Branco, Acre

    Directory of Open Access Journals (Sweden)

    Francisco da Silva Correia

    2016-12-01

    Abstract. Was conducted a study of the abundance, distribution of bee nests stingless (Apidae: Meliponini and plant species used for nesting in a fragment of secondary forest in Rio Branco-Acre. The field surveys took place in August 2015 in a forest area measuring 137 ha. The nesting substrates (trees were identified and their location recorded by GPS, and also checked the CAP measures (circumference at breast height and height of entry of the nests from the ground. In total, we found 25 nests of stingless bees distributed in three genera, with Melipona eburnea Friese the most abundant species (n=14, followed by Scaptotrigona sp. (n=7, Melipona crinita Moure & Kerr (n=2 and Tetragona sp. (n=2. The botanical species most provided cavities for foundation of the nests were Eugenia jambolana Lam. (Myrtaceae with seven nests (28% in an only individual, followed by Spondias lutea L. (Anacardiaceae and Castilla ulei Warb. (Moraceae, both with three nests (12%. The density of nests was significantly lower (0.18/ha when compared to other studies in the Neotropics, which may be related to fragment size and the degree of disturbance since it is characterized by being in a forest regeneration process.

  18. Recurso polínico coletado por abelhas sem ferrão (Apidae, Meliponinae em um fragmento de floresta na região de Manaus - Amazonas Pollen resources collected by stingless bees (Apidae, Meliponinae in a forest fragment in the Manaus region, Amazonas

    Directory of Open Access Journals (Sweden)

    Francisco Plácido Magalhães Oliveira

    2009-09-01

    Full Text Available O recurso polínico coletado por operárias de Melipona seminigra merrillae Cockerell, Melipona fulva Lepeletier, Trigona fulviventris (Smith e CephaloTrigona femorata Guérin, no Campus da UFAM, Manaus (AM foi estudado no período de março a outubro de 2001. Noventa tipos polínicos foram coletados pelas abelhas, distribuídos em 31 famílias, 67 gêneros e 10 formas Tipo. Trigona fulviventris diversificou mais suas coletas, utilizando 58 fontes no período. O tamanho do nicho polínico utilizado pelas abelhas ficou assim distribuído: T. fulviventris (58, M.s. merrillae (41, C. femorata (34 e M. fulva (25. Dos tipos determinados, os que mais contribuíram para a dieta das abelhas, apresentando as maiores freqüências nas amostras de pólen, foram Miconia myriantha (12,91%, Leucaena leucocephala (9,52%, Tapirira guianensis (6,53%, Eugenia stipitata (6,22%, Protium heptaphyllum (6,17% e Vismia guianensis (5,93%. As abelhas de modo geral concentraram suas coletas em um número reduzido de espécies vegetais e com um grau diferenciado de uso para cada uma das fontes. Tipos polínicos com freqüência acima de 10% ocorreram em pequena proporção na maioria dos meses, sendo responsáveis por mais de 50% do total do pólen coletado em cada mês. A utilização das fontes de pólen variou conforme a espécie. T. fulviventris teve uma dieta mais ampla e diversificada, enquanto M. fulva foi a que menos diversificou suas coletas. T. fulviventris apresentou maior uniformidade no uso das fontes polínicas e a sobreposição de nichos polínicos foi maior entre M.s. merrillae e M. fulva e menor entre T. fulviventris e C. femorata.The objective of this study was to characterize the resources used by Amazonian bees Melipona seminigra merrillae, Melipona fulva, Trigona fulviventris and CephaloTrigona femorata, in an urban Forest patch at Manaus city from March to October 2001. The pollen analysis determined 90 pollen types, distributed in 31 families, 67 genera and 10 palynologycal types unidentified. Trigona fulviventris was the bee species that presented the most diversified pollen types, using 58 sources in that period. The size of pollen types used were distributed as follows: T. fulviventris (58, M.s. merrilae (41, C. femorata (34 and M. fulva (25. Plant species contributing the most for the diet of the bees and presenting the highest frequencies on the pollen samples were Miconia myriantha (12,91%, Leucaena leucocephalla (9,52%, Tapirira guianensis (6,53%, Eugenia stipitata (6,22%, Protium heptaphyllum (6,17% and Vismia guianensis (5,93%. Generally the bees concentrated their collections on a reduced number of plant species and with a differentiated degree of use for each source. Pollen types with frequency above 10% occurred in a small proportion for most months, being responsible for more than 50% of all the pollen collected every month. Pollen source used varied according to the species, T. fulviventris had a more broad and diversified diet, whereas M. fulva was the bees species that least diversified its diet. T. fulviventris presented higher uniformity on the use of pollen sources and the pollen niches overlap was higher between M.s. merrillae and M. fulva and lower between T. fulviventris and C. femorata.

  19. Distribuição e especiação de mercúrio em sedimentos de áreas de garimpo de ouro do quadrilátero ferrífero (MG Distribution and speciation of mercury in sediments from gold mining sites in iron quadrangle (Minas Gerais

    Directory of Open Access Journals (Sweden)

    Cláudia Carvalhinho Windmöller

    2007-10-01

    Full Text Available The concentration and thermodesorption speciation of mercury in sediments from four different Iron Quadrangle sites impacted by gold mining activity were determined. The mercury content of some samples was considerably high (ranging from 0.04 to 1.1 µg g-1. Only Hg2+ was found and it was preferably distributed in the silt/clay fraction in all samples. Cluster analysis showed that mercury and manganese can be associated. The occurrence of cinnabar in this region as another mercury source was also discussed, corroborating earlier works showing the importance of natural mercury in the geochemical cycle of the metal in this region.

  20. Effect of nectar pillaging by native stingless bees (Hymenoptera: Apidae) in the abscission of flowers of Bougainvillea spectabilis Willd. (Nyctaginaceae) =Efeito da pilhagem de néctar por abelhas nativas sem ferrão (Hymenoptera: Apidae) na abscisão floral de Bougainvillea spectabilis Willd. (Nyctaginaceae)

    OpenAIRE

    Rodrigo Arand; Gisele Catian; Paulo Alexandre Bogiani; Igor Inforzato

    2011-01-01

    This study had as objective to evaluate whether the pillaging activity by native bees influences floral abscission. Samples were collected in ten individuals of Bougainvillea spectabilis. In the period between May 4 and June 1st, 2009, 2,874 flowers were collected on the ground and 2,895 from the plants, with three-day intervals between each collection and a total of 10 repetitions in each plant. We measured the total of closed flowers, open flowers, robbed flowers, normal flowers, open robbe...

  1. Effect of nectar pillaging by native stingless bees (Hymenoptera: Apidae in the abscission of flowers of Bougainvillea spectabilis Willd. (Nyctaginaceae =Efeito da pilhagem de néctar por abelhas nativas sem ferrão (Hymenoptera: Apidae na abscisão floral de Bougainvillea spectabilis Willd. (Nyctaginaceae

    Directory of Open Access Journals (Sweden)

    Rodrigo Arand

    2011-09-01

    Full Text Available This study had as objective to evaluate whether the pillaging activity by native bees influences floral abscission. Samples were collected in ten individuals of Bougainvillea spectabilis. In the period between May 4 and June 1st, 2009, 2,874 flowers were collected on the ground and 2,895 from the plants, with three-day intervals between each collection and a total of 10 repetitions in each plant. We measured the total of closed flowers, open flowers, robbed flowers, normal flowers, open robbed flowers and nonrobber open flowers, in both soil and plant. For the statistical analysis, the T-test was used to see whether there was a difference between the averages obtained from the evaluated characteristics between the soil flowers and plant flowers. Simple linear regression was used to see whether there was a relationship between the closed flowers and robbed closed flowers found on the ground and open flowers and non-robbed open flowers in the plant. There were significant differences regarding all variables measured between soil and plant.A correlation was found at both closed flowers and robbed closed flowers found on the ground and open flowers and non-robbed open flowers in the plant.O presente trabalho teve como objetivo avaliar a atividade de pilhagemde abelhas nativas influenciando a abscisão floral de Bougainvillea spectabilis. As coletas foram realizadas em dez indivíduos de B. spectabilis. Foram coletadas 2.874 flores no solo e 2.895 na planta no período de 4/5/2009 a 1/6/2009 com intervalo de três dias entre cada coleta, totalizando 10 repetições em cada indivíduo. Foram mensuradas as flores fechadas, flores abertas, flores fechadas pilhadas, flores fechadas não pilhadas, flores abertas pilhadas e flores abertas não pilhadas tanto no solo como na planta. Para as análises estatísticas foi utilizado o Teste-T para verificar se houve diferença entre as médias obtidas das características avaliadas entre as flores do solo e as flores da planta, além de regressão linear simples para verificar se houve relação entre as flores fechadas e flores fechadas pilhadas; flores abertas e flores abertas pilhadas, encontradas no solo e flores fechadas e flores fechadas pilhadas; flores abertas e flores abertas pilhadas na planta. Houve diferença significativa em relação a todas as variáveis entre o solo e a planta. Foi verificada correlação tanto nas flores fechadas e florespilhadas fechadas encontradas no solo quanto nas flores abertas e flores abertas não pilhadas na planta.

  2. Elasto-plastic hardening models adjustment to ferritic, austenitic and austenoferritic Rebar; Ajuste de los aceros corrugados ferríticos, austeníticos y austenoferríticos a los modelos de endurecimiento elastoplástico por deformación

    Energy Technology Data Exchange (ETDEWEB)

    Hortigóna, B.; Gallardo, J.M.; Nieto-García, E.J.; López, J.A.

    2017-09-01

    The elastoplastic behaviour of steel used for structural member fabrication has received attention to facilitate a mechanical-resistant design. New Zealand and South African standards have adopted various theoretical approaches to describe such behaviour in stainless steels. With respect to the building industry, describing the tensile behaviour of steel rebar used to produce reinforced concrete structures is of interest. Differences compared with the homogenous material described in the above mentioned standards and related literatures are discussed in this paper. Specifically, the presence of ribs and the TEMPCORE® technology used to produce carbon steel rebar may alter the elastoplastic model. Carbon steel rebar is shown to fit a Hollomon model giving hardening exponent values on the order of 0.17. Austenitic stainless steel rebar behaviour is better described using a modified Rasmussen model with a free fitted exponent of 6. Duplex stainless steel shows a poor fit to any previous model. [Spanish] Uno de los principales factores tenidos en cuenta en la fabricación de aceros estructurales es su comportamiento durante la fase elastoplástica o de endurecimiento por deformación. Normas neozelandesas y sudafricanas plantean diversas aproximaciones teóricas para describir dicho comportamiento en el caso de los aceros inoxidables. En el campo de la construcción resulta de interés la descripción del comportamiento tenso-deformacional de los aceros corrugados utilizados en las estructuras de hormigón armado. En este artículo se discuten los modelos planteados en las normas citadas anteriormente así como los existentes en la literatura tanto para los aceros corrugados inoxidables como para los aceros al carbono fabricados mediante el proceso denominado TEMPCORE® Los aceros TEMPCORE® analizados arrojan un valor del exponente de endurecimiento por deformación según el modelo de Hollomon de 0.17. Los aceros inoxidables austeníticos se ajustan mejor al modelo de Rasmussen presentando un exponente de valor 6 realizando un ajuste libre de la función correspondiente. Para los aceros inoxidables Dúplex se obtienen muy bajos ajustes para los dos modelos citados.

  3. 77 FR 1952 - Investigations Regarding Certifications of Eligibility To Apply for Worker Adjustment Assistance...

    Science.gov (United States)

    2012-01-12

    ... 12/21/11 (Workers). 81185 CBean Transport (State/One- Fort Smith, AR........ 12/22/11 12/21/11 Stop.../11 12/21/11 Process Management--Remote Automation Solutions (Company). 81192 Ferre Hickory, LLC...

  4. First report of pathogenicity of Beauveria bassiana RBL1034 to the ...

    African Journals Online (AJOL)

    SERVER

    2008-04-17

    Apr 17, 2008 ... A 12 h light and dark cycle was be maintained. Pupae were ... genic on the coffee berry borer, Hypothenemus hampei (Rehner et al., 2006). ... Data analysis ... the life span of the female A. gambiae will have a consi- derable ...

  5. Field-cage evaluation of the parasitoid Phymastichus coffea LaSalle (Hymenoptera: Eulophidae) as a natural enemy of the coffee berry borer

    Science.gov (United States)

    Phymastichus coffea (Hymenoptera: Eulophidae) is an African parasitoid that has been imported to Mexico and other Latin American countries for the biological control of the coffee berry borer, Hypothenemus hampei (Ferrari) (Coleoptera: Curculionidae: Scolytinae). As a part of the evaluation of this ...

  6. Population dynamics and distribution of the coffee berry borer ...

    African Journals Online (AJOL)

    Population dynamics and distribution of coffee berry borer, Hypothenemus hampei (Ferrari) (Coleoptera: Scolytidae) were studied on Coffea arabica L. in southwestern region of Ethiopia. Thirty coffee trees were sampled at weekly intervals from 2000 to 2001. Findings of this study showed that coffee berry borer population ...

  7. Evaluation naturelle de l'impact de Beauveria bassiana ...

    African Journals Online (AJOL)

    A study of finding out natural enemies of the coffee cherry borer beetle Coffea canephora, Hypothenemus hampei (Ferrari) (Coleoptera, Scolytidae) was carried out at two ecologically different sites of Cameroon: Nkoemvone in the South region of the country and Nkolbisson around Yaoundé in the central region. For six ...

  8. Molecular markers detect cryptic predation on coffee berry borer (Coleoptera: Curculionidae) by silvanid and laemophloeid flat bark beetles (Coleoptera: Silvanidae, Laemophloeidae) in coffee beans

    Science.gov (United States)

    The coffee berry borer, Hypothenemus hampei(Coleoptera: Curculionidae)(Ferrari), is a serious pest of coffee worldwide and has been recently introduced in Hawai’i, first detected in the state in 2010. Adult silvanid flat bark beetles, Cathartus quadricollis (Coleoptera: Silvanidae) and adult laemoph...

  9. A coffee berry borer (Coleoptera: Curculionidae: Scolytinae) bibliography

    Science.gov (United States)

    One hundred years ago, one of the most significant biological invasions of an agricultural insect pest in the Americas was initiated. Endemic to Africa, the coffee berry borer (Hypothenemus hampei; Coleoptera: Curculionidae) was accidentally introduced to Brazil in 1913 and years later invaded coffe...

  10. Predation by Flat Bark Beetles (Coleoptera: Silvanidae and Laemophloeidae) on Coffee Berry Borer (Coleoptera: Curculionidae) in Hawaii coffee

    Science.gov (United States)

    Coffee berry borer(CBB), Hypothenemus hampei, is a serious pest of coffee worldwide and a new invasive pest in Hawaii. Adult flat bark beetles, mainly Leptophloeus sp.(75%) and Cathartus quadricollis(21%) (Coleoptera: Laemophloeidae and Silvanidae, respectively), were found feeding in CBB-infested c...

  11. Karnyothrips flavipes, a previously unreported predatory thrips of the coffee berry borer: DNA-based gut content analysis

    Science.gov (United States)

    A new predator of the coffee berry borer, Hypothenemus hampei, was found in the coffee growing area of Kisii in Western Kenya. Field observations, laboratory trials and gut content analysis using molecular tools have confirmed the role of the predatory thrips Karnyothrips flavipes Jones (Phlaeothrip...

  12. A new method for calculating energy release rate in tunnel excavation subjected to high in situ stress

    Directory of Open Access Journals (Sweden)

    Xiao Qinghua

    2016-03-01

    Full Text Available Based on energy theory, energy release rate (EER and local energy release rate (LEER, a new index called FERR (Fractional Energy Release Rate is proposed, and this method can not only evaluate the risk of rock burst, but also can point out the location of high risk and the scale of rockburst. The FERR index is applied to the TBM assembling tunnel in Jinping Hydro Power Station II to evaluate the scale and intensity of rockburst, as well as the location where rockburst occurs. With FDM method adopted, the energy release rate of 3 excavation plans are calculated and the scale and risk of rockburst is evaluated, and the location of high risk of rockburst is also mapped. With FERR used in the evaluation, the rockburst is nicely controlled which ensured the safety and construction schedule of the project.

  13. Memory for Emotional Words in the First and the Second Language: Effects of the Encoding Task

    Science.gov (United States)

    Ferre, Pilar; Sanchez-Casas, Rosa; Fraga, Isabel

    2013-01-01

    Emotional words are better remembered than neutral words in the first language. Ferre, Garcia, Fraga, Sanchez-Casas and Molero (2010) found this emotional effect also for second language words by using an encoding task focused on emotionality. The aim of the present study was to test whether the same effect can also be observed with encoding tasks…

  14. Molecular gastronomy in Spain

    DEFF Research Database (Denmark)

    García-Segovia, P.; Garrido, M. D.; Vercet, A.

    2014-01-01

    Beyond the overwhelming international success of Ferrán Adria, Spain has been one of the countries with a more active implication in molecular gastronomy as a scientific discipline but also in the use of ingredients, technologies, and equipment from the scientific and technological universe...... with scientists for facing the future of Spanish gastronomy....

  15. 16 moeõppetundi itaalia stiilis / Nicole Picart, Richard Gianorio, Marie Varvoux

    Index Scriptorium Estoniae

    Picart, Nicole

    2007-01-01

    Itaalia moekunstnikud Gianfranco Ferre, Frida Giannini (Gucci), Graeme Black (Ferragamo), Angela Missioni (Missioni), Laura Lusuardi (Max Mara), Roberto Cavalli, Donatella Versace, Silvia Venturini (Fendi), Gaia Trussardi, Tomas Maier (Bottega Veneta), Dolce & Gabbana, Cristina Ortiz (Brioni), Rossella Jardini (Moschino), Alberta Ferretti, Giorgio Armani, Dean ja Dan Caten (Dsquared 2) iseloomustavad ideaalset naist, itaalia stiili, ajatut moodi ja kommenteerivad oma moekunstnikuks saamist. Lisatud fotod moekunstnikest

  16. How Students' Perceptions of the School Climate Influence Their Choice to Upstand, Bystand, or Join Perpetrators of Bullying

    Science.gov (United States)

    Ferráns, Silvia Diazgranados; Selman, Robert L.

    2014-01-01

    The authors of this article, Silvia Diazgranados Ferráns and Robert Selman, use an emergent framework to explore how the rules of the school culture at different perceived school climates affect early adolescents' decisions to upstand, bystand, or join the perpetrators when they witness peer aggression and bullying. Through a grounded theory…

  17. Development and construct validation of the German Workplace Trust Survey (G-WTS)

    NARCIS (Netherlands)

    Lehmann-Willenbrock, N.K.; Kauffeld, S.

    2010-01-01

    In research on trust in the organizational context, there is some agreement evolving that trust should be measured with respect to various foci. The Workplace Trust Survey (WTS) by Ferres (2002) provides reliable assessment of coworker, supervisor, and organizational trust. By means of a

  18. Adsorption of Lithium on Finite Graphitic Clusters

    DEFF Research Database (Denmark)

    Martinez, Jose Ignacio; Cabria, I.; Lopez, M.J.

    2009-01-01

    The apparent discrepancies between density functional (DFT) and Moller-Plesset (MP2) calculations for the interaction of lithium with graphene recently pointed out by Ferre-Vilaplana (J. Phys. Chem. C 2008, 112, 3998) are discussed. In his calculations, this author used a finite coronene cluster, C...

  19. Heterorhabditis bacteriophora effect on coffe berry borer in the Algarrobo locality, Trinidad, Cuba

    Directory of Open Access Journals (Sweden)

    Delvis Valdés Zayas

    2016-11-01

    Full Text Available Hypothenemus hampei Ferrari, coffee berry borer is considered the pest that bigger causes damage, to coffee production all over the world. It is an insect of difficult handling with the traditional control methods by mean of insecticides. For this reason the Strategy of Integrated Handling of this Plague take into consideration since manual collection of the insect up the employment of biological controls. The last alternative is one of the more appealed by coffee farmers due to the minor cost. That’s why with the realization of this work the levels of effectiveness of several doses of Heterorhabditis bacteriophora on the control of H. hampei were evaluated. There were not significant differences between the three doses evaluated so it is suggested the employment of the dose of 500 million for hectare for the control of the plague because it is the most economic dose.

  20. Lack of nucleotide variability in a beetle pest with extreme inbreeding

    OpenAIRE

    Andreev, D.; Breilid, H.; Kirkendall, L.; Brun, Luc-Olivier; French-Constant, R.H.

    1998-01-01

    The coffee berry borer beetle #Hypothenemus hampei$ (Ferrari) (#Curculionidae$ : #Scolytinae$) is the major insect pest of coffee and has spread to most of the coffee-growing countries of the world. This beetle also displays an usual life cycle, with regular sibling mating. This regular inbreeding and the population bottlenecks occuring on colonization of new regions should lead to low levels of genetic diversity. We were therefore interested in determining the level of nucleotide variation i...

  1. Economic injury level for the coffee berry borer (Coleoptera: Curculionidae: Scolytinae) using attractive traps in Brazilian coffee fields.

    Science.gov (United States)

    Fernandes, F L; Picanço, M C; Campos, S O; Bastos, C S; Chediak, M; Guedes, R N C; Silva, R S

    2011-12-01

    The currently existing sample procedures available for decision-making regarding the control of the coffee berry borer Hypothenemus hampei (Ferrari) (Coleoptera: Curculionidae: Scolytinae) are time-consuming, expensive, and difficult to perform, compromising their adoption. In addition, the damage functions incorporated in such decision levels only consider the quantitative losses, while dismissing the qualitative losses. Traps containing ethanol, methanol, and benzaldehyde may allow cheap and easy decision-making. Our objective was to determine the economic injury level (EIL) for the adults of the coffee berry borer by using attractant-baited traps. We considered both qualitative and quantitative losses caused by the coffee borer in estimating the EILs. These EILs were determined for conventional and organic coffee under high and average plant yield. When the quantitative losses caused by H. hampei were considered alone, the EILs ranged from 7.9 to 23.7% of bored berries for high and average-yield conventional crops, respectively. For high and average-yield organic coffee the ELs varied from 24.4 to 47.6% of bored berries, respectively. When qualitative and quantitative losses caused by the pest were considered together, the EIL was 4.3% of bored berries for both conventional and organic coffee. The EILs for H. hampei associated to the coffee plants in the flowering, pinhead fruit, and ripening fruit stages were 426, 85, and 28 adults per attractive trap, respectively.

  2. Susceptibility of the Parasitoid Phymastichus coffea LaSalle (Hymenoptera: Eulophidae) to Beauveria bassiana under laboratory conditions

    International Nuclear Information System (INIS)

    Castillo, Alfredo; Gomez, Jaime; Infante, Francisco; Vega, Fernando E.

    2009-01-01

    The coffee berry borer, Hypothenemus hampei (Ferrari) (Coleoptera: Curculionidae), is the most important coffee pest worldwide. Beauveria bassiana is a generalist entomopathogenic fungus widely used by coffee farmers to control this pest and Phymastichus coffea LaSalle (Hymenoptera: Eulophidae) is an African endo parasitoid of H. hampei adults, recently imported to several Latin American and Caribbean countries to aid in the coffee berry borer control. The objective of this study was to determine if B. bassiana is detrimental to P. coffea. The susceptibility of the parasitoid was evaluated in terms of adult survivorship, mean lethal concentration (LC 50 ), mean lethal time (LT 50 ), reproduction and immature mortality. The main effect of the fungus resulted in reduction of adult longevity and mortality of 100% for immature stages of this parasitoid. The LC 50 for adults was 0.11% equivalent to 9.53 x 10 7 conidia/ml of B. bassiana and a LT 50 of 29.4 h, equivalent to reduction of 22% of its normal longevity as an adult. P. coffea was capable of disseminating spores of B. bassiana to non-infected H. hampei adults, which could indirectly cause the death of its own progeny. These results could be valuable when considering the use of both organisms in the field, especially in an integrated pest management program. (author)

  3. Susceptibility of the Parasitoid Phymastichus coffea LaSalle (Hymenoptera: Eulophidae) to Beauveria bassiana under laboratory conditions; Susceptibilidad del parasitoide Phymastichus coffea LaSalle (Hymenoptera:Eulophidae) a Beauveria bassiana en condiciones de laboratorio

    Energy Technology Data Exchange (ETDEWEB)

    Castillo, Alfredo; Gomez, Jaime; Infante, Francisco [El Colegio de la Frontera Sur (ECOSUR), Chiapas (Mexico). Dept. de Entomologia Tropical], e-mail: acastill@ecosur.mx, e-mail: jgomez@ecosur.mx, e-mail: finfante@ecosur.mx; Vega, Fernando E. [United States Department of Agriculture (USDA), Beltsville, MD (United States). Agricultural Research Service. Sustainable Perennial Crops Lab.], e-mail: fernando.vega@ars.usda.gov

    2009-09-15

    The coffee berry borer, Hypothenemus hampei (Ferrari) (Coleoptera: Curculionidae), is the most important coffee pest worldwide. Beauveria bassiana is a generalist entomopathogenic fungus widely used by coffee farmers to control this pest and Phymastichus coffea LaSalle (Hymenoptera: Eulophidae) is an African endo parasitoid of H. hampei adults, recently imported to several Latin American and Caribbean countries to aid in the coffee berry borer control. The objective of this study was to determine if B. bassiana is detrimental to P. coffea. The susceptibility of the parasitoid was evaluated in terms of adult survivorship, mean lethal concentration (LC{sub 50}), mean lethal time (LT{sub 50}), reproduction and immature mortality. The main effect of the fungus resulted in reduction of adult longevity and mortality of 100% for immature stages of this parasitoid. The LC{sub 50} for adults was 0.11% equivalent to 9.53 x 10{sup 7} conidia/ml of B. bassiana and a LT{sub 50} of 29.4 h, equivalent to reduction of 22% of its normal longevity as an adult. P. coffea was capable of disseminating spores of B. bassiana to non-infected H. hampei adults, which could indirectly cause the death of its own progeny. These results could be valuable when considering the use of both organisms in the field, especially in an integrated pest management program. (author)

  4. Melhoramento do cafeeiro: XIX - Pesquisas sôbre o café semperflorens Coffee breeding: XIX - Researches on the semperflorens coffee

    Directory of Open Access Journals (Sweden)

    Célio S. Novaes Antunes

    1960-01-01

    -1951, Ribeirão Prêto (1939-1941, and Pindorama (1945-1950. The average plant yield in Campinas was 3.140 kg of ripe fruits per year; in Pindorama, 2.740 kg; and in Ribeirão Prêto, 1.660 kg. A comparison of the semperflorens coffee with selected strains of Red Bourbon indicated that the anual yields of the former variety were lower in spite of its giving several crops a year. When harvests were made at monthly intervals to study yield distribution throughout the year, two peaks were recorded: (1 one around April for the three localities; (2 another in November for Campinas and Ribeirão Preto, and December-February for Pindorama (Tables 1, 4, and 6. The average number of days from flower anthesis to ripe fruit varied from 188 to 271 days. The shortest periods of fruit development were generally those for flowers opened from September to January and the longest for the February-June flowers (Table 9. An analysis of ripe fruits attacked by the berry borer (Stephanoderes hampei Ferr. showed a high infestation during July-August and a low one in January-February. A heavy infestation occurred in 1947 and 1948 (Table 10. The semperflorens seed size was larger in June and smaller in December, at Campinas. The weight of 100 flat seeds showed little variation and averaged 10.52 g. In 1941 this value was lower than average (Table 12 corresponding to a low yield and small size of the beans. The average bean weight was higher from April to July than in the remaining months. No correlation was found between seed weight and average monthly yields, but there was a positive and significant correlation between seed weight and size. The semperflorens seed was smaller than comparable seed from typica and Red Bourbon. The amount of peaberry seed type found on semperflorens varied from 3.5 to 23.04 per cent (Table 13 with higher values in June and July when the yields were low; lower values were recorded for the harvest from October to December when the yields were high. Due to its continuous

  5. Herbal mouthwash based on Libidibia ferrea: microbiological control, sensory characteristics, sedimentation, pH and density

    OpenAIRE

    Venâncio,Gisely Naura; Rodrigues,Isis Costa; Souza,Tatiane Pereira de; Marreiro,Raquel de Oliveira; Bandeira,Maria Fulgência Costa Lima; Conde,Nikeila Chacon de Oliveira

    2015-01-01

    Introduction Phytotherapy is the study of herbal medicines and their applicability to cure diseases in general, being a therapeutic method which can be used for the prevention and treatment of mouth diseases. Among the herbal studied, the Libidibia ferrea, known as jucá or ironwood, is widely used in folk medicine by presenting anti-inflammatory, analgesic, antimicrobial and antipyretic therapeutic properties. Objective To evaluate in vitro pharmacological stability of the Libidibia ferr...

  6. some geochemical considerations in the petrogenesis of madagali

    African Journals Online (AJOL)

    DJFLEX

    lithophile elements (LILE) such as Rb, Ba, Th and K and depletion in some high field strength (HFS) elements ... Ferre et al (1998), using Sr initial ratios suggested that .... Ca O. 1.95. 2.25. 2.54. 1.96. 2.98. 2.47. 1.95. 2.55. 1.05. 1.10. 1.26. 1.37.

  7. Journal of Genetics | Indian Academy of Sciences

    Indian Academy of Sciences (India)

    ... José Manuel Cozar José Francisco Suárez-Novo Manel Castells-Esteve Pablo Fernández-Gonzalo Belén De-Paula-Carranza Montse Ferrer Ferrán Guedea Gemma Sancho-Pardo Jordi Craven-Bartle María José Ortiz-Gordillo Patricia Cabrera-Roldán Estefanía Herrera-Ramos Carlos Rodríguez-Gallego Pedro C. Lara.

  8. 25 Jahre - Institut fuer Geodaesie, Teil 3: Aus dem Leben des Instituts (25 Years - Institute of Geodesy, Part 3: The Life of the Institute)

    Science.gov (United States)

    2000-01-01

    Welsch SCHRIFTENREIHE UNIVERSITAT DER BUNDESWEHR MONCHEN 20080707 028 A %°(w Der Druck dieses Heftes wurde aus Haushaltsmitteln der Universitdt der...Verwendung hi prliziser Ephemeriden. Espe Das Ergebnis der Be- Sali ferr ktal echnungen waren 3d - @ Koordinaten sowie geo- s1fr graphische Koordinaten...1982, Aalborg Un- B. Eissfeller, G. W. Hein: A Contribution to 3d - versity Centre, Denmark. 431 S. Operational Geodesy. Part 4: The Observation Heft 8

  9. Optimal copper supply is required for normal plant iron deficiency responses

    OpenAIRE

    Waters, Brian M; Armbrust, Laura C

    2013-01-01

    Iron (Fe) and copper (Cu) homeostasis are tightly linked across biology. Understanding crosstalk between Fe and Cu nutrition could lead to strategies for improved growth on soils with low or excess metals, with implications for agriculture and phytoremediation. Here, we show that Cu and Fe nutrition interact to increase or decrease Fe and/or Cu accumulation in leaves and Fe uptake processes. Leaf Cu concentration increased under low Fe supply, while high Cu lowered leaf Fe concentration. Ferr...

  10. Molecular Gastronomy in Spain

    OpenAIRE

    García-Segovia, Purificación; Garrido, María Dolores; Vercet Tormo, Antonio; Arboleya, Juan Carlos; FISZMAN DAL SANTO, SUSANA; Martínez Monzó, Javier; Laguarda, Sergio; Palacios, Victor; Ruiz Carrascal, Jorge

    2014-01-01

    [EN] Beyond the overwhelming international success of Ferrán Adria, Spain has been one of the countries with a more active implication in molecular gastronomy as a scientific discipline but also in the use of ingredients, technologies, and equipment from the scientificand technological universe in the culinary area. Nowadays, this is a well-established discipline in Spain, with a number of research groups covering related topics, several companies commercializing appliances and additives worl...

  11. α-Amylase inhibitor-1 gene from Phaseolus vulgaris expressed in Coffea arabica plants inhibits α-amylases from the coffee berry borer pest

    Directory of Open Access Journals (Sweden)

    Oliveira-Neto Osmundo B

    2010-06-01

    Full Text Available Abstract Background Coffee is an important crop and is crucial to the economy of many developing countries, generating around US$70 billion per year. There are 115 species in the Coffea genus, but only two, C. arabica and C. canephora, are commercially cultivated. Coffee plants are attacked by many pathogens and insect-pests, which affect not only the production of coffee but also its grain quality, reducing the commercial value of the product. The main insect-pest, the coffee berry borer (Hypotheneumus hampei, is responsible for worldwide annual losses of around US$500 million. The coffee berry borer exclusively damages the coffee berries, and it is mainly controlled by organochlorine insecticides that are both toxic and carcinogenic. Unfortunately, natural resistance in the genus Coffea to H. hampei has not been documented. To overcome these problems, biotechnological strategies can be used to introduce an α-amylase inhibitor gene (α-AI1, which confers resistance against the coffee berry borer insect-pest, into C. arabica plants. Results We transformed C. arabica with the α-amylase inhibitor-1 gene (α-AI1 from the common bean, Phaseolus vulgaris, under control of the seed-specific phytohemagglutinin promoter (PHA-L. The presence of the α-AI1 gene in six regenerated transgenic T1 coffee plants was identified by PCR and Southern blotting. Immunoblotting and ELISA experiments using antibodies against α-AI1 inhibitor showed a maximum α-AI1 concentration of 0.29% in crude seed extracts. Inhibitory in vitro assays of the α-AI1 protein against H. hampei α-amylases in transgenic seed extracts showed up to 88% inhibition of enzyme activity. Conclusions This is the first report showing the production of transgenic coffee plants with the biotechnological potential to control the coffee berry borer, the most important insect-pest of crop coffee.

  12. Alpha-amylase inhibitor-1 gene from Phaseolus vulgaris expressed in Coffea arabica plants inhibits alpha-amylases from the coffee berry borer pest.

    Science.gov (United States)

    Barbosa, Aulus E A D; Albuquerque, Erika V S; Silva, Maria C M; Souza, Djair S L; Oliveira-Neto, Osmundo B; Valencia, Arnubio; Rocha, Thales L; Grossi-de-Sa, Maria F

    2010-06-17

    Coffee is an important crop and is crucial to the economy of many developing countries, generating around US$70 billion per year. There are 115 species in the Coffea genus, but only two, C. arabica and C. canephora, are commercially cultivated. Coffee plants are attacked by many pathogens and insect-pests, which affect not only the production of coffee but also its grain quality, reducing the commercial value of the product. The main insect-pest, the coffee berry borer (Hypotheneumus hampei), is responsible for worldwide annual losses of around US$500 million. The coffee berry borer exclusively damages the coffee berries, and it is mainly controlled by organochlorine insecticides that are both toxic and carcinogenic. Unfortunately, natural resistance in the genus Coffea to H. hampei has not been documented. To overcome these problems, biotechnological strategies can be used to introduce an alpha-amylase inhibitor gene (alpha-AI1), which confers resistance against the coffee berry borer insect-pest, into C. arabica plants. We transformed C. arabica with the alpha-amylase inhibitor-1 gene (alpha-AI1) from the common bean, Phaseolus vulgaris, under control of the seed-specific phytohemagglutinin promoter (PHA-L). The presence of the alpha-AI1 gene in six regenerated transgenic T1 coffee plants was identified by PCR and Southern blotting. Immunoblotting and ELISA experiments using antibodies against alpha-AI1 inhibitor showed a maximum alpha-AI1 concentration of 0.29% in crude seed extracts. Inhibitory in vitro assays of the alpha-AI1 protein against H. hampei alpha-amylases in transgenic seed extracts showed up to 88% inhibition of enzyme activity. This is the first report showing the production of transgenic coffee plants with the biotechnological potential to control the coffee berry borer, the most important insect-pest of crop coffee.

  13. AGUACATE Y SAUCE: Nuevos hospederos del pasador del cafeto, Xylosandrus (Xyleborus morigerus Bland.

    Directory of Open Access Journals (Sweden)

    Vélez Angel Raúl

    1972-08-01

    Full Text Available El pasador de las ramas del cafeto, Xylosandrus (Xyleborus morigerus Bland , es una de las plagas más severas que afectan al cultivo del cafeto en el mundo. Pertenece al grupo de los escolítidos ambrosiales, grupo de coleópteros diminutos dentro de la familia Scolytidae, el cual se caracteriza porque sus integrantes perforan el duramen de muchos árboles y algunos lo hacen en frutos o semillas, como es el caso de la broca del café. Hypothenemus (Stephanoderes hampei, cuya presencia aún no se ha confirmado en Colombia.

  14. La broca del café en Líbano.Impacto socioproductivo y cultural en los años 90

    OpenAIRE

    Ramírez, Renzo

    2009-01-01

    Este texto analiza el impacto de la broca del café Hypothenemus hampei (Ferrari) en Colombia. Su explicación identifica los rasgos generales de la caficultura en las fases de producción tradicional y tecnificada en el municipio de Líbano, Tolima. Responde a las siguientes preguntas: ¿Cuáles son las prácticas fitosanitarias y las políticas institucionales aplicadas durante la expansión de la plaga en los años noventa? ¿Cuál es el impacto de la broca en términos sociales, productivos y cultural...

  15. Resultados de un proceso de capacitación e innovación participativas para la adopción del manejo agroecológico de la broca del café en Cuba

    OpenAIRE

    Vázquez Moreno, Luis L.; Murguido, Carlos; Navarro, Aurelio; García, Mario

    2010-01-01

    La broca del café (Hypothenemus hampei) se ha convertido en la principal plaga de este cultivo en el país desde mediados de los años noventa y para su manejo se ha utilizado el insecticida endosulfán, la eliminación de frutos infestados y el uso del hongo entomopatógeno Beauveria bassiana, entre otras prácticas. Debido a la necesidad de transitar hacia la caficultura sostenible, se realizó un proyecto de innovación y capacitación participativas para lograr la adopción de prácti...

  16. Evaluación y validación de mezclas de Beauveria bassiana (Balsamo) Vuillemin y Metarhizium anisopliae (Metschnikoff) Sorokin para el control de la Broca del café en frutos infestados caídos al suelo

    OpenAIRE

    Jaramillo González , Jorge Luis

    2012-01-01

    Resumen: Beauveria bassiana y Metarhizium anisopliae son entomopatógenos usados como agentes de control biológico contra la broca del café (Hypothenemus hampei Ferrari). La exploración de la diversidad genética de las cepas ha demostrado que el uso de mezclas puede resultar en procesos de coinfección y sinergismo que incrementan la virulencia y mortalidad sobre los insectos. Esta investigación se desarrolló con el fin de evaluar y validar en campo el efecto de las mezclas de cepas de B. bass...

  17. Coffee berry borer in conilon coffee in the Brazilian Cerrado: an ancient pest in a new environment.

    Science.gov (United States)

    Oliveira, C M; Santos, M J; Amabile, R F; Frizzas, M R; Bartholo, G F

    2018-02-01

    The aim of this study was to verify the occurrence of the coffee berry borer, Hypothenemus hampei (Ferrari), and to evaluate the population fluctuation of the pest in the Brazilian Cerrado (Federal District). The study was conducted, between November 2014 and October 2015, at Embrapa Cerrados (Planaltina/DF, Brazil) in an irrigated conilon coffee production area. In November 2014, 120 samples (ten berries/sample) were collected from berries that had fallen on the ground from the previous harvest. Between November 2014 and October 2015, insects were collected weekly, using traps (polyethylene terephthalate bottles) baited with ethyl alcohol (98 GL), ethyl alcohol (98 GL) with coffee powder, or molasses. Between January and July 2015, samples were collected fortnightly from 92 plants (12 berries per plant). All samples were evaluated for the presence of adult coffee berry borers. Samples from the previous harvest had an attack incidence of 72.4%. The baited traps captured 4062 H. hampei adults, and showed no statistical difference in capture efficiency among the baits. Pest population peaked in the dry season, with the largest percentage of captured adults occurring in July (31.0%). An average of 18.6% of the collected berries was attacked by the borer and the highest percentage incidence was recorded in July (33.2%). Our results suggest that the coffee berry borer, if not properly managed, could constitute a limiting factor for conilon coffee production in the Brazilian Cerrado.

  18. Keefektivan Beauveria bassiana (Bals. Vuill. isolat Indigenous pagaralam sumatera selatan pada media beras terhadap larva Plutella xylostella Linn. (Lepidoptera: Yponomeutidae

    Directory of Open Access Journals (Sweden)

    Yulia Pudjiastuti

    2017-02-01

    Full Text Available The objective of study was to investigate the effectiveness of Beauveria bassiana isolate cultured in half-ripe rice media against third-instar larvae of Plutella xylostella. The research used 10 isolates consisted of 4 isolates that were originnally collected from Pagaralam i.e. PD1 (isolated from P. xylostella cadaver, PD2, PD8, PD9B (from Crysodeixis chalcites cadaver, and 6 isolates from other areas as comparison, i.e. CCW3 (from Crysodeixis chalcites cadaver, BBL (from Hypothenemus hampei cadaver, CH (from Conomorpha cramerella cadaver, CPJW (from H. hampei cadavi, WC (from Nilaparvata lugens cadaver, and WSJT (from Leptocorixa acuta cadaver. The parameters that were measured were mortality of larvae, time of death and behaviour of larvae after application. Result of the test showed that B. bassiana isolated from L. acuta (WSJT isolate caused the highest mortality i.e. 73.34 %, with the highest spore density 5.6x107 spore ml-1 (in half-rice media and 3.0x107 spore ml-1 (GYA media. The lowest LT50 was 19.27 hours, and was obtained from the application of PD9B. After application of B. bassiana, the behaviour of larvae was slightly change from a healthy one to less in consuming of food and then die.

  19. Pollen morphology and study of the visitors (Hymenoptera, Apidae of Solanum stramoniifolium Jacq. (Solanaceae in Central Amazon Morfologia polínica e estudo dos visitantes (Hymenoptera, Apidae de Solanum stramoniifolium Jacq. (Solanaceae na Amazônia Central

    Directory of Open Access Journals (Sweden)

    Alexandre Coletto da Silva

    2004-09-01

    Full Text Available The Solanaceae family has a wide distribution, mainly in the tropical and subtropical areas of South America. Solanum L. is one of the most important genera of the family with approximately 1,200 species. The objective of this work was to study the floral biology, pollen morphology as well as to investigate the bee visitors of S. stramoniifolium. Preliminary data indicate the presence of one species of stinging bee and four species of stingless bees as visitors to S. stramoniifolium. The pollen of S. stramoniifolium is tricolporate and psilate or without ornamentation. In a word, S. stramoniifolium constitutes a potential source of pollen for different species of bees with and without sting, providing an interesting field for germination studies, insect-plant interactions and floral biology that are already under way.A família Solanaceae tem ampla distribuição, principalmente nas áreas tropicais e subtropicais da América do Sul. Solanum L. é um dos mais importantes gêneros desta família com aproximadamente 1.200 espécies. O objetivo deste trabalho foi o de estudar a biologia floral com enfoque na morfologia polínica e no registro de algumas abelhas visitantes de S. stramoniifolium. Dados preliminares indicam a presença de uma espécie de abelha com ferrão e quatro espécies sem ferrão como visitantes de S. stramoniifolium. O pólen de S. stramoniifolium é tricolporado e psilado, ou seja, sem ornamentação. Conclui-se, após o estudo da biologia floral, que S. stramoniifolium constitui fonte potencial de pólen para diferentes espécies de abelhas com e sem ferrão, representando interessante campo para estudos de germinação, interações inseto-planta e biologia floral.

  20. Um novo fio de aço inoxidável para aplicações ortodônticas A new stainless steel wire for orthodontic purposes

    Directory of Open Access Journals (Sweden)

    André Itman Filho

    2011-08-01

    Full Text Available OBJETIVO: desenvolver uma metodologia para fabricação de fios ortodônticos de aço inoxidável austeno-ferrítico SEW 410 Nr. 14517 por meio dos processos convencionais de laminação e trefilação. MÉTODOS: o aço austeno-ferrítico foi elaborado em um forno elétrico de indução. A qualidade dos fios foi avaliada por ensaios de tração e medidas de microdureza. A ductilidade e a manuseabilidade foram analisadas por meio da confecção de componentes ortodônticos. RESULTADOS E CONCLUSÕES: os valores encontrados mostraram que os fios de aço inoxidável austeno-ferrítico atenderam às normas BS 3507:1976 e ISO 5832-1, e apresentaram ótima ductilidade para confecção de componentes ortodônticos com dobras complexas.OBJECTIVE: To develop a method to manufacture austenitic-ferritic stainless steel orthodontic wires (SEW 410 Nr. 14517 using conventional rolling and wiredrawing processes. METHODS: Austenitic-ferritic steel was produced in an induction furnace. Traction trials and microhardness measurements were used to evaluate wire quality. Orthodontic parts were fabricated to assess ductility and malleability. RESULTS AND CONCLUSIONS: Austenitic-ferritic stainless steel wires meet the BS 3507:1976 and ISO 5832-1 norms and have excellent ductility for the fabrication of orthodontic parts with complex folds.

  1. Strong composition dependence of resistive switching in Ba1-xSrxTiO3 thin films on semiconducting substrates and its thermodynamic analysis

    OpenAIRE

    Mohammad Moradi, Omid; Şen, Canhan; Sen, Canhan; Boni, A. G.; Pintilie, L.; Mısırlıoğlu, Burç; Misirlioglu, Burc

    2018-01-01

    In this work, we report on the variability of the Schottky effect in solution processed Ba1-xSrxTiO3 films (BST, x = 0, 0.5) grown on 0.5% Nb doped SrTiO3 substrates with top Pt electrodes (NSTO/BST/Pt). The films display leakage currents accompanied by varying degrees of hystereses in the current-voltage measurements. The magnitude of the leakage and hystereses depend on the Sr content. We focus on the current-voltage (I-V) behavior of our samples in the light of thermodynamic theory of ferr...

  2. Presión: aprende a utilizar correctamente la presión atmosférica, total, manomérica, parcial y de vapor

    OpenAIRE

    Fernandez-Torres, Maria J.

    2010-01-01

    Participan: Voz: Dra. María José Fernández Torres; Colaboran: Dra. María Dolores Saquete Ferrándiz y Dr. Francisco Ruiz Beviá. En este vídeo se explican los conceptos de PRESIÓN ATMOSFÉRICA, PRESIÓN TOTAL, PRESIÓN MANOMÉTRICA, PRESIÓN PARCIAL y PRESIÓN DE VAPOR. A su vez, se muestra la relación entre algunos tipos de presiones y se insiste que la PRESIÓN DE VAPOR es la única de todas ellas que es función de estado.

  3. METODOLOGIA PARA CONCEPÇÃO DE CABINES DE MÁQUINAS AGRÍCOLAS COM ENFOQUE NA SEGURANÇA E ERGONOMIA

    OpenAIRE

    Ulisses Benedetti Baumhardt

    2012-01-01

    Diante do atual processo de evolução tecnológica das cabines de máquinas agrícolas, impulsionada em grande parte pela agricultura de precisão, verifica-se a existência de falhas no provimento da segurança e ergonomia. Logo, o modo como as novas tecnologias estão sendo disponibilizadas ao usuário no posto de operação, bem como o ambiente envolvido, tornam-se fatores importantes a serem trabalhados. Neste sentido, esta tese objetivou o desenvolvimento de uma metodologia e ferr...

  4. Espaços da violência na narrativa brasileira contemporânea

    Directory of Open Access Journals (Sweden)

    Valdemar Valente Junior

    2013-01-01

    Full Text Available This article emphasizes aspects of the violence as a relevant theme in the literary Brazilian production of the last decade. The examples situate the discourse narrative as a consequence of the disordered growth of the urban centers affected by economic models that generate unfairness and social inequality. The needy communities controlled by the drug trafficking effective themselves as the stage where still dominates the crime and the prostitution. The works of Paulo Lins, Ferréz, Luiz Alberto Mendes e Alessandro Buzo approximate the reader to the social reality that was lived by them.

  5. CAPACITACIÓN EN LIDERAZGO PARA MEJORAR LAS RELACIONES INTERPERSONALES EN EL PERSONAL QUE LABORA EN EL INSTITUTO DE EDUCACIÓN SUPERIOR TECNOLÓGICO PÚBLICO ENRIQUE LÓPEZ ALBÚJAR FERREÑAFE

    OpenAIRE

    Pérez Germán, Juan José; INSTITUTO DE EDUCACIÓN SUPERIOR TECNOLÓGICO PÚBLICO ENRIQUE LÓPEZ ALBÚJAR

    2017-01-01

    La investigación se centró en proponer un modelo de Capacitación en Liderazgo para el personal que labora en el IEST Público Enrique López Albújar de Ferreñafe, al observar deficiencias en las relaciones interpersonales, teniendo como base las teorías del liderazgo participativo y democrático de Likert, la teoría de liderazgo personal e interpersonal de Fischman, de las relaciones humanas de Chiavenato y de las relaciones humanas de Mayo. La investigación es propositiva, trabajando con 58 tra...

  6. Modelling the influence of climate on malaria occurrence in Chimoio Municipality, Mozambique

    OpenAIRE

    Ferr?o, Jo?o Lu?s; Mendes, Jorge M.; Painho, Marco

    2017-01-01

    Ferrão, J. L., Mendes, J. M., & Painho, M. (2017). Modelling the influence of climate on malaria occurrence in Chimoio Municipality, Mozambique. Parasites and Vectors, 10(1), 1-12. DOI: 10.1186/s13071-017-2205-6 Background: Mozambique was recently ranked fifth in the African continent for the number of cases of malaria. In Chimoio municipality cases of malaria are increasing annually, contrary to the decreasing trend in Africa. As malaria transmission is influenced to a large extent by cli...

  7. CARACTERIZAÇÃO FÍSICO-QUÍMICA DO MEL DE MELIPONA FULVA LEPELETIER, 1836 (HIMENOPTERA: APIDAE: MELIPONINAE) UTILIZADA NA MELIPONICULTURA POR COMUNIDADES TRADICIONAIS DO ENTORNO DA CIDADE DE MACAPÁ-AP

    OpenAIRE

    Chaves, Alison Felipe Alencar; Gomes, Jorge Emílio Henriques; da Costa, Arley José Silveira

    2012-01-01

    O estudo buscou determinar as características físico-químicas do mel de abelha sem ferrão Melipona fulva Lepeletier, 1836 (Hymenoptera: Apidae: Meliponinae) utilizada na meliponicultura por comunidades tradicionais do entorno da cidade de Macapá, AP. As características físico-químicas analisadas foram: umidade, cinzas, acidez, pH, condutividade e hidroximetilfurfural. Os resultados foram expressos em média ± desvio padrão e comparados com os valores limites presentes na legislação vigente e c...

  8. Produção de hidromel utilizando mel de Melipona scutellaris

    OpenAIRE

    Peixoto, Samira; Carvalho, Carlos Alfredo; Estevinho, Leticia M.

    2014-01-01

    Atualmente, existe uma crescente procura de bebidas fermentadas por parte dos consu-midores, particularmente de hidromel, produzido empiricamente desde a antiguidade. De acordo com a literatura, este bebida tem excelentes efeitos na digestão e metabolismo e é benéfico para doentes com anemia crónica e doenças do trato gastrointestinal [1].Esta bebida é geralmente produzida utilizando mel de Apis mellifera, no entanto, no Brasil existe também mel de abelhas sem ferrão, como Melipona scutellaris...

  9. Perfil do geoturista do Parque Estadual da Serra do Rola-Moça (MG)

    OpenAIRE

    Fonseca Filho, Ricardo Eustáquio; Universidade Federal de Ouro Preto, Ouro Preto, MG; Ribeiro, Gabriela Sousa; Circuito Turístico Montanhas e Fé, MG

    2016-01-01

    O Parque Estadual da Serra do Rola-Moça (PESRM) é uma unidade de conservação de Proteção Integral em Minas Gerais, com características geológicas e geomorfológicas que o caracterizam como um geossítio do Geoparque do Quadrilátero Ferrífero, com alto potencial para o geoturismo. A pesquisa teve por objetivo conhecer o perfil do visitante do PESRM, na tentativa de identificar se há entre os visitantes potenciais geoturistas. A metodologia incluiu revisão bibliográfica e digital, e trabalho de c...

  10. Norms for 10,491 Spanish words for five discrete emotions: Happiness, disgust, anger, fear, and sadness.

    Science.gov (United States)

    Stadthagen-González, Hans; Ferré, Pilar; Pérez-Sánchez, Miguel A; Imbault, Constance; Hinojosa, José Antonio

    2017-09-18

    The discrete emotion theory proposes that affective experiences can be reduced to a limited set of universal "basic" emotions, most commonly identified as happiness, sadness, anger, fear, and disgust. Here we present norms for 10,491 Spanish words for those five discrete emotions collected from a total of 2,010 native speakers, making it the largest set of norms for discrete emotions in any language to date. When used in conjunction with the norms from Hinojosa, Martínez-García et al. (Behavior Research Methods, 48, 272-284, 2016) and Ferré, Guasch, Martínez-García, Fraga, & Hinojosa (Behavior Research Methods, 49, 1082-1094, 2017), researchers now have access to ratings of discrete emotions for 13,633 Spanish words. Our norms show a high degree of inter-rater reliability and correlate highly with those from Ferré et al. (2017). Our exploration of the relationship between the five discrete emotions and relevant lexical and emotional variables confirmed findings of previous studies conducted with smaller datasets. The availability of such large set of norms will greatly facilitate the study of emotion, language and related fields. The norms are available as supplementary materials to this article.

  11. Théâtre les 50

    CERN Document Server

    Théâtre les 50

    2011-01-01

    Le Théâtre Les 50 de Saint Jean de Gonville propose : ARAGON CHANTÉ ET PARLÉ : Ferré, Ferrat, Brassens LOUIS ARAGON, écrivain et poète français ... Cofondateur de la revue Libération en 1919, avec André Breton et Philippe Soupault, Aragon publia l'un des meilleurs romans surréalistes, Le Paysan de Paris (1926). Lié à la Résistance durant toute l'occupation, Aragon participa après la guerre aux activités du Parti communiste français. Son œuvre poétique fut marquée par son amour pour sa compagne, Elsa Triolet. À partir de la fin des années 1950, nombre de ses poèmes ont été mis en musique et chantés notamment par Jean Ferrat et Léo Ferré, contribuant à faire connaître son œ...

  12. Incidência de pragas e doenças em agroecossistemas de café orgânico de agricultores familiares em Poço Fundo-MG Incidence of plagues and diseases in agroecossystems of organic coffee of familiar farmers in Poço Fundo-MG

    Directory of Open Access Journals (Sweden)

    Márcia Martins

    2004-12-01

    Full Text Available Objetivando-se determinar a incidência de pragas Leucoptera coffeella (GUÉRIN-MENÉVILLE, 1842 e Hypothenemus hampei (FERRARI, 1867 e doenças Hemileia vastatrix (BERK e BROOME, 1869 e Cercospora coffeicola (BERK e CURTIS, 1880, durante o período de janeiro de 2001 a dezembro de 2002, foram selecionados três agroecossistemas com produção de café orgânico conduzidos por agricultores familiares do município de Poço Fundo-MG. O agroecossistema I possui 2.200 pés da cultivar 'Catuaí Vermelho' em espaçamento 2,5 x 1,3 m (0,72 ha. O agroecossistema II possui 2.000 pés ('Catuaí Vermelho' em espaçamento 2,8 x 1,0 m (0,56 ha. O agroecossistema III possui 1.100 pés ('Icatu Amarelo' em espaçamento 3,0 x 0,9 m (0,36 ha. A determinação da incidência de L. coffeella, C. coffeicola e H. vastatrix foi realizada mediante levantamentos mensais. A determinação da infecção por C. coffeicola em frutos foi realizada nos meses de abril, maio e junho de 2001 e 2002. O levantamento da infestação por H. hampei foi realizado nos meses de janeiro a junho/julho de cada ano. Determinou-se que a infestação por L. coffeella ultrapassou 20% no terço superior (principalmente no período seco. A infestação por H. hampei atingiu o nível de dano somente no agroecossistema I, em 2001, e no agroecossistema III, em 2002. A infecção por H. vastatrix no agroecossistema III não atingiu nível de dano em conseqüência da tolerância da cultivar ('Icatu' à infecção por esse fungo; porém, nos agroecossistemas I e II ('Catuaí Vermelho', a infecção na lavoura ultrapassou o nível de 10% (principalmente no período seco. A infecção por C. coffeicola em folhas e frutos atingiu níveis elevados (período seco. A produtividade do agroecossistema I, em 2001, foi de 510 Kg ha-1 e, em 2002, de 2.340 Kg ha-1; no agroecossistema II, em 2001, foi de 420 Kg ha-1 e, em 2002, de 1.290 Kg ha-1; e, no agroecossistema III, foi praticamente zero, em 2001, e em

  13. A proof of the cancellation of the redistribution tidal potential effects on the rotation of an elastic Earth model

    Science.gov (United States)

    Baenas, Tomás; Escapa, Alberto; Ferrándiz, Jose Manuel

    2014-05-01

    The gravitational action of the Moon and the Sun on the elastic Earth originates a redistribution of its mass. In turn, this redistribution is responsible of an additional term in the gravitational potential energy of the system, commonly referred to as tidal potential of redistribution. Its effects on the Earth rotation were previously discussed in Escapa et al. (2004) and Lambert & Mathews (2006). A numerical approach was followed in those works to show that for an elastic Earth model, assumed to be spherical and non-rotating in the undeformed state, there is no net contribution to the motion of the figure axis. This result is consistent with the corresponding one deduced from the torque approach, where one can derive analytically that the redistribution torque for that elastic Earth model vanishes (e.g., Krasinsky 1999). However, it is far from being a trivial question to recover the same result when working directly with the tidal potential of redistribution, as in Escapa et al. (2004) or Lambert & Mathews (2006). In this investigation we revisit the issue, enhancing and completing former results by Escapa et al. (2004). In particular, we aim at proving, by analytical means, that the redistribution tidal potential of the former elastic Earth model does not affect its rotational motion. To this end we expand that potential in terms of an Andoyer-like set of canonical variables, and then compute the torque associated to it. This choice was motivated by the suitability of this set of variables to extend our calculations to the nutations of other different elastic or anelastic Earth models, through the Hamiltonian framework (e.g., Ferrándiz et al. 2012). We show the exact cancellation of the derived expressions as a consequence of certain properties fulfilled by the expansions of the orbital motion of the perturbing bodies. Acknowledgement. - This work has been partially supported by the Spanish government trhough the MINECO projects I+D+I AYA201022039-C02-01, AYA

  14. Development of safe optimized welding procedures for high strength Q&T steel welded with austenitic consumables Desenvolvimento de procedimentos de soldagem seguros e otimizados para aços temperados e revenido de alta resistência com consumíveis austeníticos

    Directory of Open Access Journals (Sweden)

    Lenka Kuzmikova

    2013-06-01

    Full Text Available High strength quenched and tempered (Q&T steels offer obvious economic benefits originating from their advantageous strength to price and weight ratios. These steels are usually welded using ferritic consumables and for this combination the risk of hydrogen assisted cold cracking (HACC is high. The use of austenitic stainless steel (ASS consumables has great potential to significantly improve this issue. Yet, there are no guidelines for determination of safe level of preheat for welding ferritic steels with ASS consumables. For this reason manufacturers adopt this parameter from procedures developed for conventional ferritic consumables thus significantly limiting the benefits ASS consumables are capable to deliver. Productivity could be further enhanced by identifying the upper interpass temperature threshold, thus reducing the stand-off times. Aim of this work is to develop safe highly optimised procedures for welding of high strength Q&T steel with ASS consumable.Aços temperados e revenidos de alta resistência (Q&T oferecem vantagens econômicas óbvias originadas de sua benéfica razão resistência e custo ou peso. Estes aços são normalmente soldados com consumíveis ferríticos e, por esta causa, apresentam alto risco de trinca de hidrogênio. O uso de consumíveis de aços inoxidáveis austeníticos representa um grande potencial para melhorar este aspecto. Entretanto, não há recomendações técnicas para determinar um nível seguro de temperatura de pré-aquecimento para soldagens de aços ferríticos com consumíveis austeníticos. Por isto, fabricantes adotam para este parâmetro os tirados de procedimentos desenvolvidos para consumíveis ferríticos convencionais, consequentemente reduzindo os benefícios que os consumíveis austeníticos poderiam fornecer. Produtividade poderia ser intensificada pela identificação da temperatura de interpasse, reduzindo os tempos mortos. O objetivo do presente trabalho foi o de desenvolver

  15. + Acesso: a acessibilidade em conteúdos educativos

    OpenAIRE

    Alves, Paulo; Esteves, Rui

    2004-01-01

    A acessibilidade na Web é cada vez mais uma preocupação dos Web designers, sendo as directivas WCAG 1.0 (Web Content Accessibility Guidelines) do W3C as normas internacionais para a concepção de sítios Web acessíveis. Apesar de um maior conhecimento das normas da acessibilidade e existindo também legislação que obriga à sua adopção em sítios de organismos públicos, a maioria dos sítios na Web não cumprem as directivas WCAG. Este artigo apresenta o desenvolvimento de uma ferr...

  16. Filogeografia e conservação de Melipona capixaba Moure e Camargo, 1994 e Melipona scutellaris Latreille, 1811, e biogeografia do gênero Melipona Illiger, 1806 (Hymenoptera: Apidae)

    OpenAIRE

    Resende, Helder Canto

    2012-01-01

    A abelha sem ferrão Melipona capixaba Moure e Camargo, 1994, a uruçu-capixaba, é endêmica da Mata Atlântica brasileira e está ameaçada de extinção. Sua distribuição geográfica é conhecida apenas em áreas de altitude do estado do Espírito Santo. Melipona scutellaris Latreille, 1811, a uruçu nordestina, tem sido considerada como presumivelmente ameaçada de extinção devido à redução de sua área de ocorrência natural. A espécie ocorre na Mata Atlântica entre os estados da Bahia ao Rio Grande d...

  17. Danza e pantomima: modelli interpretativi e chiavi di lettura

    Directory of Open Access Journals (Sweden)

    Stefania Onesti

    2015-03-01

    Full Text Available One of the most ambiguous question in the studying of pantomime ballet is its staging. The combination between dance and pantomime, true novelty of theatrical dance reform, is for us an enigma difficult to solve.The aim of this paper is to outline how dance and pantomime can combine in the eighteenth Century ballet. We will examine, among others, the following sources: the John Weaver’s libretto of The Loves of Mars and Venus (1717, the report of the Mercure de France on the staging of Maria Sallé’s Pygmalion (1734, Gennaro Magri’s Trattato teorico-prattico (1779 and Ferrère manuscript (written in the 1782. These documents are a sort of “interpretative models” and allow to identify an international common stage practice which, most likely, regards also choreographers active in Italy in the second half of Eighteenth Century.

  18. Préface

    OpenAIRE

    Tétreault, Sylvie

    2017-01-01

    Moi, mes souliers ont beaucoup voyagé.Ils m’ont porté de l’école à la guerre.J’ai traversé sur mes souliers ferrésLe monde et sa misère !Félix Leclerc, chanteur québécois (1914-1988)Moi mes souliers Depuis toujours, l’humain s’est déplacé au fil des saisons. Il a changé d’habitat pour avoir de meilleures conditions de vie et pour se mettre à l’abri de dangers potentiels. Aujourd’hui, de nombreuses personnes sont obligées de s’expatrier pour permettre à leurs enfants de grandir dans un pays sé...

  19. Grenvillian age magmatism in the Southern Espinhaço Range (Minas Gerais): evidence from U-Pb zircon ages.

    OpenAIRE

    Chaves, Mario Luiz de Sá Carneiro; Silva, Márcio Célio Rodrigues da; Scholz, Ricardo Augusto; Babinski, Marly

    2013-01-01

    Este trabalho descreve a primeira possível ocorrên¬cia in situ de uma rocha vulcânica datada no período Grenvilleano (~ 1,4 – 1,0 Ga) na Serra do Espinhaço Meridional, com idade máxima de deposição em ca. 1,16 Ga. A amostra Vul-1A, intrusiva no Com¬plexo Basal arqueano, possui estrutura brechoide, formada por clastos de xistos, formações ferríferas (FFs), rochas vulcânicas e granitoides, em matriz vulcânica muito fina a média, petrograficamente de natureza básica com tendência alcalina, defin...

  20. Mechanics of advanced functional materials

    CERN Document Server

    Wang, Biao

    2013-01-01

    Mechanics of Advanced Functional Materials emphasizes the coupling effect between the electric and mechanical field in the piezoelectric, ferroelectric and other functional materials. It also discusses the size effect on the ferroelectric domain instability and phase transition behaviors using the continuum micro-structural evolution models. Functional materials usually have a very wide application in engineering due to their unique thermal, electric, magnetic, optoelectronic, etc., functions. Almost all the applications demand that the material should have reasonable stiffness, strength, fracture toughness and the other mechanical properties. Furthermore, usually the stress and strain fields on the functional materials and devices have some important coupling effect on the functionality of the materials. Much progress has been made concerning the coupling electric and mechanical behaviors such as the coupled electric and stress field distribution in piezoelectric solids, ferroelectric domain patterns in ferr...

  1. A escrita da cidade partida: identidade e alteridade em Capão Pecado

    Directory of Open Access Journals (Sweden)

    Luciana Paiva Coronel

    2013-01-01

    Full Text Available This article discusses the representation of the city in the novel Capão Pecado, by Ferréz. It deviates from the strong tendency of considering all cities alike in the Brazilian fiction scenery by means of a narrative that takes place in a geographical area within the outskirts of São Paulo. This area is characterized by violence and extreme poverty and it works as the headquarters of a movement of self-assurance of the have-nots. The novel brings a broken and raw text, written with the cooperation of cultural leaders of the area. There is a mix of fictional aspects and a great deal of testimony. The author seeks to build a community feeling among the people who live in Capão Redondo and at the same time he opposes the downtown area of the city, where the people who benefit from the inequities of the status quo live.

  2. Implementação de um sistema de manutenção preventiva

    OpenAIRE

    Marques, Pedro José Dias

    2009-01-01

    Com a globalização dos mercados e consequente concorrência, asempresas vêem-se cada vez mais confrontadas com a necessidade de evoluir,não só através da melhoria de qualidade no seu produto/serviço como pelaredução de custos. Uma das áreas que se revela crucial na obtenção destesobjectivos é a manutenção, não só pela crescente necessidade de maquinariana indústria actual, como pela diminuição de custos e aumento de fiabilidadeque esta possibilita. Funcionando inicialmente, apenas como ferr...

  3. Análise da variabilidade genética de uma pequena população de Frieseomelitta varia (Hymenoptera, Apidae, Meliponini) por meio de análise do DNA mitocondrial, microssatélites e morfometria geométrica das asas

    OpenAIRE

    Paulo Henrique Pereira Gonçalves

    2010-01-01

    As abelhas da tribo Meliponini apresentam distribuição pantropical. São encontradas mais de 400 espécies pertencentes a 50 gêneros, sendo que mais de 300 estão presentes nas Américas. Os meliponíneos são responsáveis por grande parte da polinização das plantas nativas. A destruição das florestas tem ameaçado seriamente as abelhas sem ferrão, isolando-as em fragmentos e expondo-as ao endocruzamento e aos efeitos de perda de variabilidade genética. No presente estudo, foram empregadas análises ...

  4. Aumento en la resistencia a la corrosión de un acero t91 aluminizado

    OpenAIRE

    QUINTERO, LUZ S.; LAVERDE, DIONISIO; ESCALANTE, HUMBERTO

    2011-01-01

    El acero ferrítico T91 ha sido ampliamente utilizado en plantas de generación de energía eléctrica, calderas y plantas nucleares. Sin embargo, su resistencia a la oxidación se ve gravemente afectada a temperaturas superiores a los 600ºC. En esta investigación se empleó la técnica de cementación empacada para aluminizar un acero T91 y se encontraron las condiciones óptimas para la formación de un recubrimiento libre de porosidad y con espesor uniforme (300 micras). Se evaluó la capa de óxido f...

  5. Dicty_cDB: Contig-U01276-1 [Dicty_cDB

    Lifescience Database Archive (English)

    Full Text Available developm... 42 0.032 2 ( CX071007 ) UCRCS08_1C07_b Parent Washington Navel Orange Cal... 42 0.032 2 ( CX6381... Citrus reshni cDNA clone... 42 0.032 2 ( CX071008 ) UCRCS08_1C07_g Parent Washington Navel Orange Cal... 42...A09 Developing fruit flavedo at 80 DAF... 42 0.032 2 ( CX075462 ) UCRCS08_45A05_b Parent Washington Navel Or...lla cDNA cl... 42 0.032 2 ( CX075463 ) UCRCS08_45A05_g Parent Washington Navel Orange Ca... 42 0.032 2 ( CX2...30 ) C05811C09SK FerrChloR1 Citrus sinensis x Poncirus... 42 0.032 2 ( DN619505 ) UCRCS11_04A09_r Parent

  6. Actitudes hacia el consumo y materialismo en estudiantes universitarios de pedagogía en Chile

    Directory of Open Access Journals (Sweden)

    Marianela Denegri Coria

    2015-01-01

    Full Text Available El propósito de esta investigación fue establecer la relación entre actitudes hacia la compra y el consumo y el materialismo en estudiantes universitarios de formación inicial docente. La muestra estuvo compuesta por 870 estudiantes universitarios de pedagogía. Se utilizó la escala de actitudes hacia la compra y consumo (Luna y Ferres, 1998 y la escala de materialismo (Richins y Dawson, 1992. Los resultados señalan correlación entre materialismo e impulsividad y entre materialismo y compulsividad, indicando que la compra no planificada se vincula a los valores de materialismo que identifican a las sociedades actuales. Los hallazgos se discuten considerando el impacto de los futuros profesores en la generación de actitudes hacia el consumo responsable en sus estudiantes y la importancia de incluir estos temas en la formación inicial docente.

  7. Effects of exercise on the markers of iron status in serum of cross-country skiers

    Directory of Open Access Journals (Sweden)

    J Malczewska-Lenczowska

    2010-12-01

    Full Text Available The study aim was to assess the within-subject, day-to-day variability for ferritin and soluble transferrin receptor (sTfR concentrations in serum of 6 female and 8 male cross-country skiers aged 16-18 years under a regular training regimen throughout 8 consecutive days. The concentrations of iron status variables and creatine kinase (CK activities were adjusted to plasma volume changes. Mean ferritin concentrations were 30.6 • 1.142[sup]±1[/sup] and 22.6 • 1.167[sup]±1[/sup] μg/l for men and women, respectively, the average within-subject, mean day-to-day variability coefficients (CV being 13.4% in men and 15.2% in women. Mean sTfR was 2.14 • 1.050[sup]±1[/sup] and 2.62 • 1.047[sup]±1[/sup] mg/l, respectively, and mean day-to-day CV 6.5% and 4.6%. Mean CV for sTfR/logFerr were 6.0% and 7.4%, respectively. Neither index correlated with training loads or CK activities. Thus, the training performed once daily had no significant effect on ferritin concentrations on the following morning, so ferritin alone may prove insufficient in detecting iron deficiency in endurance athletes. The low variability of sTfR under endurance loads made it useful in detecting iron deficiency together with ferritin and the sTfR/logFerr index. Adjusting the concentrations of ferritin and sTfR by changes in plasma volume might be recommendable for endurance athletes.

  8. The advertisement call, color patterns and distribution of Ischnocnema izecksohni (Caramaschi and Kisteumacher, 1989 (Anura, Brachycephalidae

    Directory of Open Access Journals (Sweden)

    Pedro P. G. Taucce

    2012-01-01

    Full Text Available Ischnocnema izecksohni inhabits the gallery forests from the Quadrilátero Ferrífero, Southern Espinhaço range, state of Minas Gerais, southeastern Brazil, and it is considered endemic to this region. Its closest related species is I. nasuta according to the original description. We describe the advertisement call of I. izecksohni based on specimens recorded and collected at the municipality of Nova Lima, state of Minas Gerais, distant about 10 km straight line from its type locality. The advertisement call consists of a group of notes emitted sporadically without a regular interval between the calls. Call duration (n = 36 calls in four individuals ranged from 1.03 to 1.85 s (= 1.52 ± 0.21 s and the call rise time from 0.66 to 1.52 s (= 1.16 ± 0.25 s, with 34-57 notes per call (= 47.42 ± 6.03. Peak frequency ranged from 2250 to 2625 Hz, the dominant frequency from 1317.8 to 3128.0 Hz and interval between notes from 22.00 to 41.00 ms (= 28.63 ± 0.03 ms. From the examination of herpetological collections, morphological and bioacoustical data we extended the species known distribution ca. 200 km eastward, to ten new localities, all of them outside the Quadrilátero Ferrífero region, at the Mantiqueira mountain range. We analyzed color patterns and we find some dorsal patterns not described at the original description of I. izecksohni. We also make some comments concerning the taxonomic status of I. izecksohni and I. nasuta.

  9. Lack of nucleotide variability in a beetle pest with extreme inbreeding.

    Science.gov (United States)

    Andreev, D; Breilid, H; Kirkendall, L; Brun, L O; ffrench-Constant, R H

    1998-05-01

    The coffee berry borer beetle Hypothenemus hampei (Ferrari) (Curculionidae: Scolytinae) is the major insect pest of coffee and has spread to most of the coffee-growing countries of the world. This beetle also displays an unusual life cycle, with regular sibling mating. This regular inbreeding and the population bottlenecks occurring on colonization of new regions should lead to low levels of genetic diversity. We were therefore interested in determining the level of nucleotide variation in nuclear and mitochondrial genomes of this beetle worldwide. Here we show that two nuclear loci (Resistance to dieldrin and ITS2) are completely invariant, whereas some variability is maintained at a mitochondrial locus (COI), probably corresponding to a higher mutation rate in the mitochondrial genome. Phylogenetic analysis of the mitochondrial data shows only two clades of beetle haplotypes outside of Kenya, the proposed origin of the species. These data confirm that inbreeding greatly reduces nucleotide variation and suggest the recent global spread of only two inbreeding lines of this bark beetle.

  10. Vegetation classification of Coffea on Hawaii Island using WorldView-2 satellite imagery

    Science.gov (United States)

    Gaertner, Julie; Genovese, Vanessa Brooks; Potter, Christopher; Sewake, Kelvin; Manoukis, Nicholas C.

    2017-10-01

    Coffee is an important crop in tropical regions of the world; about 125 million people depend on coffee agriculture for their livelihoods. Understanding the spatial extent of coffee fields is useful for management and control of coffee pests such as Hypothenemus hampei and other pests that use coffee fruit as a host for immature stages such as the Mediterranean fruit fly, for economic planning, and for following changes in coffee agroecosystems over time. We present two methods for detecting Coffea arabica fields using remote sensing and geospatial technologies on WorldView-2 high-resolution spectral data of the Kona region of Hawaii Island. The first method, a pixel-based method using a maximum likelihood algorithm, attained 72% producer accuracy and 69% user accuracy (68% overall accuracy) based on analysis of 104 ground truth testing polygons. The second method, an object-based image analysis (OBIA) method, considered both spectral and textural information and improved accuracy, resulting in 76% producer accuracy and 94% user accuracy (81% overall accuracy) for the same testing areas. We conclude that the OBIA method is useful for detecting coffee fields grown in the open and use it to estimate the distribution of about 1050 hectares under coffee agriculture in the Kona region in 2012.

  11. Controle massal da broca-do-café com armadilhas de garrafa Pet vermelha em cafeeiro

    Directory of Open Access Journals (Sweden)

    Flávio Lemes Fernandes

    2014-08-01

    Full Text Available O objetivo deste trabalho foi avaliar a eficácia de armadilha de garrafa Pet vermelha contendo compostos voláteis alcoólicos atrativos, no controle massal da broca-do-café (Hypothenemus hampei. As avaliações foram realizadas em quatro lavouras de café, durante dois anos. Foram distribuídas 900 armadilhas de garrafa Pet, pintadas de vermelho, em três das quatro lavouras; uma lavoura sem armadilhas foi usada como controle. O broqueamento dos frutos (% foi determinado nessas lavouras. Houve redução do broqueamento de frutos nas lavouras com armadilhas, da safra 2007/2008 para a safra 2008/2009. As maiores densidades da broca-do-café nas armadilhas foram observadas nos estádios de floração e de frutos chumbinho. A armadilha de garrafa Pet vermelha é eficaz no controle massal da população da broca-do-café, por reduzir a percentagem de frutos broqueados em 57%; entretanto, essa redução não é suficiente para manter as densidades da broca abaixo do nível de controle.

  12. Sterile Males of Ceratitis Capitata (Diptera: Tephritidae) as Disseminators of Beauveria Bassiana Conidia for IPM Strategies

    Energy Technology Data Exchange (ETDEWEB)

    Flores, Salvador; Campos, Sergio; Montoya, Pablo [Programa Moscafrut SAGARPA-IICA, Camino a los Cacahotales S/N, Metapa de Dominguez, Chiapas 30860 (Mexico); Villasenor, Antonio; Valle, Alvaro; Enkerlin, Walther [Codireccion Mexico, Programa Regional Moscamed Mexico- Guatemala-Estados Unidos (Guatemala); Toledo, Jorge; Liedo, Pablo [Departamento Agricultura Sociedad y Ambiente, El Colegio de la Frontera Sur. Carretera Antiguo Aeropuerto, Tapachula, Chiapas 30700 (Mexico)

    2014-01-15

    Full text: Sterile Mediterranean fruit fly, Ceratitis capitata (Wied.), males were evaluated as vectors to spread Beauveria bassiana (Bals) conidia to wild C. capitata populations under field conditions. The inoculated sterile males were released by air, using the chilled adult technique over 7000 ha of coffee growing in Chimaltenango, Guatemala, Central America. The impact of releases was determined using dry traps baited with a food attractant. The effects of these releases on Apis mellifera, Linnaeus (honey bee), Hypothenemus hampei, Ferrari (coffee berry borer) and the parasitic mite Varroa destructor (Oudeman) were also evaluated. Inoculated sterile males were able to transmit fungal spores to 44% of the wild C. capitata flies captured in traps, which likely were infected through intra- and intersexual interactions during leks, mating or mating attempts. There was no transmission of the fungal spores to non- target insect species such as coffee berry borer, honey bees or varroa. We conclude that sterile males of Mediterranean fruit fly inoculated with B. bassiana can act as effective vectors of conidia to wild populations, constituting a safe, environmentally friendly and selective alternative for suppressing the medfly under a Sterile Insect Technique-based IPM approach. (author)

  13. Integrated Pest Management of Coffee Berry Borer in Hawaii and Puerto Rico: Current Status and Prospects

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    Luis F. Aristizábal

    2017-11-01

    Full Text Available The coffee berry borer (CBB, Hypothenemus hampei, is the most significant insect pest of coffee worldwide. Since CBB was detected in Puerto Rico in 2007 and Hawaii in 2010, coffee growers from these islands are facing increased costs, reduced coffee quality, and increased pest management challenges. Here, we outline the CBB situation, and summarize the findings of growers, researchers, and extension professionals working with CBB in Hawaii. Recommendations for the Integrated Pest Management (IPM program for CBB in Hawaiian Islands and Puerto Rico include: (1 establish a CBB monitoring program, (2 synchronize applications of insecticides with peak flight activity of CBB especially during the early coffee season, (3 conduct efficient strip-picking as soon as possible after harvest and perform pre-harvest sanitation picks in CBB hotspots if needed, (4 establish protocols to prevent the escape of CBB from processing areas and when transporting berries during harvest, and (5 stump prune by blocks. Progress achieved includes the introduction of the mycoinsecticide Beauveria bassiana to coffee plantations, the coordination of area-wide CBB surveys, the establishment and augmentation of native beetle predators, and an observed reduction of CBB populations and increased coffee quality where IPM programs were established. However, CBB remains a challenge for coffee growers due to regional variability in CBB pressures, high costs, and labor issues, including a lack of training and awareness of CBB management practices among growers.

  14. Integrated Pest Management of Coffee Berry Borer in Hawaii and Puerto Rico: Current Status and Prospects

    Science.gov (United States)

    Aristizábal, Luis F.; Johnson, Melissa; Shriner, Suzanne; Hollingsworth, Robert; Manoukis, Nicholas C.; Myers, Roxana; Bayman, Paul; Arthurs, Steven P.

    2017-01-01

    The coffee berry borer (CBB), Hypothenemus hampei, is the most significant insect pest of coffee worldwide. Since CBB was detected in Puerto Rico in 2007 and Hawaii in 2010, coffee growers from these islands are facing increased costs, reduced coffee quality, and increased pest management challenges. Here, we outline the CBB situation, and summarize the findings of growers, researchers, and extension professionals working with CBB in Hawaii. Recommendations for the Integrated Pest Management (IPM) program for CBB in Hawaiian Islands and Puerto Rico include: (1) establish a CBB monitoring program, (2) synchronize applications of insecticides with peak flight activity of CBB especially during the early coffee season, (3) conduct efficient strip-picking as soon as possible after harvest and perform pre-harvest sanitation picks in CBB hotspots if needed, (4) establish protocols to prevent the escape of CBB from processing areas and when transporting berries during harvest, and (5) stump prune by blocks. Progress achieved includes the introduction of the mycoinsecticide Beauveria bassiana to coffee plantations, the coordination of area-wide CBB surveys, the establishment and augmentation of native beetle predators, and an observed reduction of CBB populations and increased coffee quality where IPM programs were established. However, CBB remains a challenge for coffee growers due to regional variability in CBB pressures, high costs, and labor issues, including a lack of training and awareness of CBB management practices among growers. PMID:29135952

  15. The Glória quartz-monzodiorite: isotopic and chemical evidence of arc-related magmatism in the central part of the Paleoproterozoic Mineiro belt, Minas Gerais State, Brazil

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    Ciro A. Ávila

    2006-09-01

    Full Text Available The Glória quartz-monzodiorite, one of the mafic plutons of the Paleoproterozoic Mineiro belt, is intrusive into banded gneisses, amphibolites, schists and phyllites of the Rio das Mortes greenstone belt, in the southern portion of the São Francisco Craton, State of Minas Gerais, Brazil. The Glória quartz-monzodiorite yields a SHRIMP U-Pb zircon age of 2188 ± 29 Ma, suggesting a tectonic relationship with the pre-collisional phase of the Mineiro belt. According to the Nd isotopic evidence (epsilonNd(T = -3.4; T DM = 2.68 Ga the original magmas was formed by a mixture among Archean crustal material and Paleoproterozoic juvenile magma. The Glória quartz-monzodiorite shows metaluminous and calc-alkaline tendency with intermediate K content, comparable to that of volcanic-arc rocks. The primary mineralogical assemblage was partly modified by metamorphism, dated between 2131-2121 Ma in nearby coeval plutons. Such metamorphism is significantly older than the reported metamorphic episodes of the Mineiro belt in the Quadrilátero Ferrífero region (2059-2041 Ma in the eastern portion of the study area. This evidence, together with chemical and isotopic data from other mafic and felsic plutons coeval with the Glória quartz-monzodiorite, indicate a tectonic and magmatic migration within the Mineiro belt from west to east.O Quartzo Monzodiorito Glória é um corpo plutônicomáfico associado à evolução Paleoproterozóica do Cinturão Mineiro. Este é intrusivo em gnaisses bandados, anfibolitos, xistos e filitos do Greenstone Belt Rio das Mortes, na porção sudeste do Cráton São Francisco, Estado de Minas Gerais, Brasil. Este corpo possui idade de cristalização SHRIMP (em zircão de 2188 ± 29 Ma, enquanto os isótopos de Nd (épsilonNd(T = -3,4; T DM = 2,68 Ga apontam que sua fonte magmática envolveumaterial juvenil paleoproterozóico contaminada por protólitos arqueanos. As rochas do Quartzo Monzodiorito Glória são metaluminosas, c

  16. Carburization of austenitic and ferritic alloys in hydrocarbon environments at high temperature

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    Serna, A.

    2003-12-01

    Full Text Available The technical and industrial aspects of high temperature corrosion of materials exposed to a variety of aggressive environments have significant importance. These environments include combustion product gases and hydrocarbon gases with low oxygen potentials and high carbon potentials. In the refinery and petrochemical industries, austenitic and ferritic alloys are usually used for tubes in fired furnaces. The temperature range for exposure of austenitic alloys is 800-1100 °C, and for ferritic alloys 500-700 °C, with carbon activities ac > 1 in many cases. In both applications, the carburization process involves carbon (coke deposition on the inner diameter, carbon absorption at the metal surface, diffusion of carbon inside the alloy, and precipitation and transformation of carbides to a depth increasing with service. The overall kinetics of the internal carburization are approximately parabolic, controlled by carbon diffusion and carbide precipitation. Ferritic alloys exhibit gross but uniform carburization while non-uniform intragranular and grain-boundary carburization is observed in austenitic alloys.

    La corrosión a alta temperatura, tal como la carburación de materiales expuestos a una amplia variedad de ambientes agresivos, tiene especial importancia desde el punto de vista técnico e industrial. Estos ambientes incluyen productos de combustión, gases e hidrocarburos con bajo potencial de oxígeno y alto potencial de carbono. En las industrias de refinación y petroquímica, las aleaciones austeníticas y ferríticas se utilizan en tuberías de hornos. El rango de temperatura de exposición para aleaciones austeníticas está entre 800-1.100°C y para aleaciones ferríticas está entre 500-700°C, con actividades de carbono ac>1 en algunos casos. En tuberías con ambas aleaciones, el proceso de carburación incluye deposición de carbón (coque en el diámetro interno, absorción de carbono en la superficie

  17. Magnetic properties of frictional volcanic materials

    Science.gov (United States)

    Kendrick, Jackie E.; Lavallée, Yan; Biggin, Andrew; Ferk, Annika; Leonhardt, Roman

    2015-04-01

    magnetisation (ARM), as expected for a thermal origin, the remanence of volcanic pseudotachylyte has been found to be comparable to an isothermal remanent magnetisation (IRM). Thus, the pseudotachylyte has experienced a strong magnetic field that overwrote the previous thermoremanent magnetisation of the magma, such as the strong local electric current that occurs in faults (e.g. Ferré et al., 2005). Additionally, the pseudotachylyte seems more often to comprise of uniaxial non-interacting single-domain particles compared to pseudo-single in the host, and to have a single Curie temperature whereas the host more commonly exhibits multiple phases. Differences in rock-magnetic parameters between the pseudotachylyte and host are significant, but not as high as those observed in granites by Nakamura et al. (2002) or Ferré et al. (2005), probably because granitic host rocks do not already carry a strong and stable remanence as do these extrusive volcanic rocks. The application of rock-magnetic tests in volcanology will undoubtedly continue to be a "go-to" tool for identification of pseudotachylytes, which are increasingly being recognised to play an important role in dome-building eruptions. Refs: Ferré, E.C., Zechmeister, M.S., Geissman, J.W., MathanaSekaran, N. and Kocak, K., 2005. The origin of high magnetic remanence in fault pseudotachylites: Theoretical considerations and implication for coseismic electrical currents. Tectonophysics, 402(1-4): 125-139. Nakamura, N., Hirose, T. and Borradaile, G.J., 2002. Laboratory verification of submicron magnetite production in pseudotachylytes: relevance for paleointensity studies. . Earth and Planetary Science Letters, 201(1): 13-18.

  18. Música para pianoforte, órgano y clave, en dos cuadernos zaragozanos de la primera mitad del siglo XIX

    Directory of Open Access Journals (Sweden)

    Yáñez Navarro, Celestino

    2007-12-01

    Full Text Available This paper deals with the study and analysis of two keyboard music notebooks. They were copied by their owner Benigno Cariñena Salvador, an organist, violinist and composer (*Calahorra -La Rioja-, February 13th 1829; †Zaragoza, July 27th 1886 and nowadays are in the Music Archive in Zaragoza Cathedral (E:Zac. The manuscripts compile a heterogeneous typology of works for different keyboard instruments: organ, harpsichord and pianoforte, with a clear “functional” nature. The repertoire consists of liturgical works, sonatas, trios, overture transcriptions and Italian opera excerpts, variations and works for vocal soloists with keyboard accompaniment. The composers appearing on the notebooks are local -R. Ferreñac, F. Garcés and V. Metón- national -J. Lidón- and foreign -F. J. Haydn, J. L. Adam, V. Bellini, G. A. Rossini, G. Paccini, L. Ricci, G. Donizetti-.

    El presente artículo versa sobre el estudio y análisis de dos cuadernos de música de tecla que fueron copiados por el entonces propietario -el organista, violinista y compositor- Benigno Cariñena Salvador (*Calahorra -La Rioja-, 13-II-1829; †Zaragoza, 27-VII-1886 y que actualmente se encuentran depositados en el Archivo de Música de las Catedrales de Zaragoza (E: Zac. Los manuscritos recopilan una tipología heterogénea de obras destinadas a diversos instrumentos de tecla: órgano, clave y pianoforte, con un evidente carácter “funcional”. El repertorio está constituido por composiciones litúrgicas, sonatas, tríos, transcripciones de oberturas o fragmentos de óperas italianas, variaciones y composiciones para solistas vocales con el acompañamiento para teclado. Los compositores que aparecen son locales -R. Ferreñac, F. Garcés y V. Metón-, nacionales -J. Lidón- y extranjeros -F. J. Haydn, J. L. Adam, V. Bellini, G. A. Rossini, G. Paccini, L. Ricci, G. Donizetti-.

  19. Composição de amostras de mel de abelha Jataí (Tetragonisca angustula latreille, 1811 Composition of the honey of samples originated from Jataí bees (Tetragonisca angustula latreille, 1811

    Directory of Open Access Journals (Sweden)

    Daniela de Almeida Anacleto

    2009-09-01

    Full Text Available As características físico-químicas do mel produzido pelas abelhas sem ferrão ainda são pouco conhecidas, principalmente devido à elevada diversidade da flora apícola e à baixa produção que é inerente a estas espécies. O objetivo deste trabalho foi determinar as características físico-químicas de 20 amostras de mel de Jataí (Tetragonisca angustula, do município de Piracicaba, estado de São Paulo, contribuindo para o estabelecimento de um padrão de qualidade do mel das abelhas sem ferrão brasileiras, possibilitando o controle da fraude deste produto. Desta maneira, as seguintes análises foram realizadas: açúcares totais, açúcares redutores, sacarose aparente, umidade, hidroximetilfurfural, proteínas, cinzas, pH, acidez, índice de formol, condutividade elétrica, cor, atividade diastásica e atividade de água. Os resultados demonstram que a legislação atual, referente ao mel de Apis mellifera, não é adequada para todos os caracteres analisados, reforçando a necessidade de um padrão próprio para os méis de meliponíneos.The knowledge regarding the physicochemical characteristics of the honey produced by stingless bees is still limited, mainly due to the high diversity of the floral resources and the low production that is inherent to these species. This research deals with the physicochemical characteristics of 20 samples of Tetragonisca angustula honey, from the municipality of Piracicaba, state of São Paulo, Brazil, contributing to the establishment of a quality standard for the honey produced by Brazilian stingless bees making possible the control of this product. Thus, the following parameters were determined: total sugars, reducing sugars, apparent sucrose, moisture content, hydroxymethylfurfural, proteins, ashes, pH, acidity, formol index, electrical conductivity, color, diastase activity, and water activity. The results indicated that the Brazilian standard rules, referring to the Apis mellifera honey, are

  20. Influencia de los tratamientos térmicos en el comportamiento frente al desgaste por abrasión de una fundición de grafito esferoidal obtenida mediante adición de boro

    Directory of Open Access Journals (Sweden)

    Varela, A.

    2008-08-01

    Full Text Available By adding boron to the liquid metal, it is possible to obtain spheroidal graphite cast iron without any need for special inoculants. The boron may be in metallic form; alternatively, borax, ferroboron, boron carbonate or borocalcium can be used. These alloys as cast present a pearlite matrix with more or less spheroidal graphite, which is usually edged in ferrite that has markings in the shape of bull’s eye. With normalising, the ferrite edges are eliminated. Thus, a pearlite matrix is achieved. Annealing results in an entirely ferrite matrix; quenching and tempering produce a tempered martensite matrix.This study measures the behaviour under wear of this alloy as cast, normalised, annealed, quenched and tempered . A “pin on disk” test is employed; load and speed conditions, as well as the pin type, are kept constant. Moreover, wear is calculated through weighing, and the variation for the friction coefficient is determined in each case.

    Mediante la adición de boro al metal líquido, bien en forma metálica o en forma de bórax, ferroboro, carburo de boro o boruro cálcico, se pueden obtener fundiciones de grafito esferoidal sin necesidad de inoculantes especiales. Estas fundiciones en estado bruto de colada presentan una matriz perlítica con grafito más o menos esferoidal que suele estar orlado de ferrita formando ojos de buey. Por tratamiento térmico de normalizado, se consigue eliminar la orla ferrítica y tener una matriz enteramente perlítica. Por recocido, se puede obtener una matriz enteramente ferrítica y por temple y revenido una matriz de martensita revenida. En el presente trabajo se mide el comportamiento frente al desgaste abrasivo de la aleación indicada, en estado bruto de colada, normalizado, recocido y bonificado, utilizando el ensayo pin on disk, manteniendo fijas las condiciones de ensayo en cuanto a carga, velocidad y tipo de pin, calculando el desgaste producido por pesada. También, se

  1. Formación de fase sigma en uniones soldadas de acero inoxidable súper dúplex fundido

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    Garin, J. L.

    2011-08-01

    Full Text Available This paper decribes the microstructural characteristics of weldments of cast super duplex stainless steel (J93404, being subjected to annealing processes to induce formation of sigma-phase at high temperatures. The influence of heating time at 1073 K, 1123 K and 1173 K upon precipitation of sigma in the heat affected zone, base metal and fusion zone of the weldments was analyzed. The experimental results revealed the formation of this intermetallic compound throughout decomposition of the ferritic phase into austenite and sigma. At earlier stages of the transformation the phase rapidly nucleates and growth along the ferrite-austenite grain boundaries, and then massively advances towards the bulk of the ferritic zone with greater effectiveness as temperature increases. The formation of sigma-phase in all weldments resembles the Johnson-Mehl-Avrami’s mechanism stated for nucleation and growth.

    El presente trabajo describe las características microestructurales de uniones soldadas de acero súper dúplex fundido (J93404, al ser sometidas a procesos de recocido para inducir la formación de fase sigma a altas temperaturas. Se analizó la influencia del tiempo de calentamiento a 1.073 K, 1.123 K y 1.173 K sobre la precipitación de fase sigma en la zona afectada térmicamente, metal base y zona de fusión de los conjuntos soldados. Los resultados experimentales evidenciaron la formación de este compuesto intermetálico por descomposición de la fase ferrítica en austenita y sigma. Al comienzo de la transformación la fase nuclea y crece rápidamente en los bordes de grano austenita-ferrita, extendiéndose luego masivamente hacia el seno de la zona ferrítica, con mayor efectividad en términos del aumento de la temperatura de proceso. La formación de sigma en todas las uniones soldadas obedece a un mecanismo de nucleación y crecimiento del tipo Jonson-Mehl-Avrami.

  2. Plasma spot welding of ferritic stainless steels

    Directory of Open Access Journals (Sweden)

    Lešnjak, A.

    2002-06-01

    Full Text Available Plasma spot welding of ferritic stainless steels is studied. The study was focused on welding parameters, plasma and shielding gases and the optimum welding equipment. Plasma-spot welded overlap joints on a 0.8 mm thick ferritic stainless steel sheet were subjected to a visual examination and mechanical testing in terms of tension-shear strength. Several macro specimens were prepared. Plasma spot welding is suitable to use the same gas as shielding gas and as plasma gas, i.e., a 98 % Ar/2 % H 2 gas mixture. Tension-shear strength of plasma-spot welded joints was compared to that of resistance-spot welded joints. It was found that the resistance welded joints withstand a somewhat stronger load than the plasma welded joints due to a larger weld spot diameter of the former. Strength of both types of welded joints is approximately the same.

    El artículo describe el proceso de soldeo de aceros inoxidables ferríticos por puntos con plasma. La investigación se centró en el establecimiento de los parámetros óptimos de la soldadura, la definición del gas de plasma y de protección más adecuado, así como del equipo óptimo para la realización de la soldadura. Las uniones de láminas de aceros inoxidables ferríticos de 0,8 mm de espesor, soldadas a solape por puntos con plasma, se inspeccionaron visualmente y se ensayaron mecánicamente mediante el ensayo de cizalladura por tracción. Se realizaron macro pulidos. Los resultados de la investigación demostraron que la solución más adecuada para el soldeo por puntos con plasma es elegir el mismo gas de plasma que de protección. Es decir, una mezcla de 98 % de argón y 2 % de hidrógeno. La resistencia a la cizalladura por tracción de las uniones soldadas por puntos con plasma fue comparada con la resistencia de las uniones soldadas por resistencia por puntos. Se llegó a la conclusión de que las uniones soldadas por resistencia soportan una carga algo mayor que la uniones

  3. NEOTECTONICS, RIVER CAPTURE AND LANDSCAPE EVOLUTION IN THE HIGHLANDS OF SE BRAZIL

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    Chrystiann Lavarini

    2016-01-01

    Full Text Available El Sinclinal Moeda, ubicado en las tierras altas del Cuadrilátero Ferrífero (sureste de Brasil, presenta características de inversión de relieve y reorganización de drenaje. En este trabajo, las cuencas del Rio do Peixe y Ribeirão Mata Porcos fueron analizados. Se llevaron a cabo análisis morfológico y morfométrico por medio de SIG. Los resultados indican que el Ribeirão Mata Porcos ha sido capturado primero, permitiendo el avance de la onda de incisión que denudó la cuenca y rebajó el nivel de base. En una última fase de las capturas, se han producido la reversión de algunos canales de drenaje y la generación de codos fluviales. A lo largo de estos hechos ocurrieron la migración preferente de canales fluviales para la dirección este, el pirateamento de las aguas del subsuelo y la decapitación de parte de la cuenca del Rio do Peixe. Basándose en estos resultados, se cree que los eventos responsables por la evolución del Sinclinal Moeda durante el Cuaternario estaban relacionados, sobretodo a las capturas fluviales (sensu strictu, diversion y beheading controlado por causas neotectónicas y litoestructurales.

  4. Comportamiento frente a la corrosión de los aceros inoxidables AISI 430L P/M

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    Corpas, F. A.

    2004-04-01

    Full Text Available In this paper we have studied the resistance to corrosion of the 430L ferritic stainless steels, manufactured by powder metallurgy. We have compared the behaviour of the different series of 430L stainless steels sintered, tempered and annealing, in different corrosive environments. Finally, the microstructure of the steels was determined by means of scanning electron microscopy. The better resistance to corrosion are produced in the steel annealing to 300ºC and 600ºC.

    En este trabajo hemos estudiado la resistencia a la corrosión que presentan los aceros inoxidables ferríticos 430L fabricados por procedimientos pulvimetalúrgicos. Hemos evaluado y comparado distintas series de aceros inoxidables 430L sinterizados, templados y madurados a diferentes temperaturas en atmósfera de nitrógeno, introduciéndolos en varios medios corrosivos de distinta naturaleza. Por último, se determinó la microestructura, mediante microscopía electrónica de barrido. Los mejores valores de resistencia a la corrosión se encuentran para los aceros tratados a 300ºC y 600ºC.

  5. W Acana Sains Dalam Novel Supernova Episode Ksatria, Puteri, Dan Bintang Jatuh

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    Ida Nurul Chasanah

    2008-12-01

    Full Text Available This paper is aimed to describe the stories of Supernova 1 to identify the fiction and non• fiction dialectics and also to represent science aspect in Supernova novel Episode Ksatria, Puteri, dan Bintang Jatuh (Supernova 1 through the relationship of intertextuality. We can find five stories in novel Supernova 1, they are the stories about Ruben-Dhimas, Ferre-Rana-Arwin, Diva, Supernova, and classic fairy tale knight, princess, and falling star. The dialectics between fiction and non-fiction in Supernova I are found through some indications, such as cover, tittle, scientific process of writing method in fiction such as the use of footnote, the insert of bibliography and index, and also preface, the dynamic of character, events arragernent that make plot, mentioning 'keping' to change chapter. Science aspect in Supernova 1 are not only a pacth but they are represented in text structure. The transformation of science elements in novel Supernova 1 are more affirmative with hypogram that is referred by some expansion. That science elements are astronomy, chaos theory (it covers Lorenz butterflies and fractal geometri, Schrodinger, co-evolution, and non-linear theories.

  6. Physicochemical characteristics and sensory profile of honey samples from stingless bees (Apidae: Meliponinae submitted to a dehumidification process

    Directory of Open Access Journals (Sweden)

    Carlos A.L. Carvalho

    2009-03-01

    Full Text Available This study was conducted to evaluate the effect of a dehumidification process on the physicochemical and sensory characteristics of stingless-bee honey. Melipona scutellaris and M. quadrifasciata honey samples were submitted to a dehumidification process and to physicochemical (reducing sugars, apparent sucrose, moisture, diastatic activity, hydroxymethylfurfural, ash, pH, acidity, and electric conductivity and sensory evaluations (fluidity, color, aroma, crystallization,flavor,and acceptability. The results indicated that the dehumidification process does not interfere with honey quality and acceptability.Este estudo foi conduzido com o objetivo de avaliar o efeito do processo de desumidificação sobre as características físico-químicas e sensoriais do mel das abelhas sem ferrão. Amostras de méis de Melipona scutellaris e M. quadrifasciata foram submetidas ao processo de desumidificação, passando em seguida por avaliações físico-químicas (açúcares redutores, sacarose aparente, umidade, atividade diastásica, hidroximetilfurfural, cinzas, pH, acidez e condutividade elétrica e sensoriais (fluidez, cor, aroma, cristalização, sabor e aceitabilidade. Os resultados indicaram que o processo de desumidificação não interfere na qualidade e aceitabilidade do mel.

  7. Quadrilatero ferrifero, MG, Brazil. Regional characteristics justify application for global geoparks network

    International Nuclear Information System (INIS)

    Mantesso-Neto, V.; Azevedo, U.; Guimarães, R.; Nascimento, M.; Beato, D.; Castro, P.; Liccardo, A.

    2010-01-01

    Geopark, a concept created in 2000, is neither strictly geological nor a park in the usual sense. Geopark is a holistic concept, aimed at promoting sustainable economic development based on unique geological features (represented by “geosites”, outcrops with special value, under some point of view), but also having a social objective. The Global Geoparks Network (GGN), working in synergy with UNESCO, has 64 members in 19 countries. This paper presents a brief history and some characteristics of a few European Geoparks, followed by some aspects of the Quadrilátero Ferrífero. As shall be seen, this area is rich in geosites, and in historical, social and cultural attractions. On the other hand, foreseeing a decline in mineral exploitation in mid-century, it urgently seeks a good plan for regional development. As a conclusion, it will be seen that its characteristics fit the Geopark concept, and justify the support of the geoscientific community, and that of society in general, to its application, recently submitted to UNESCO, for admission to the GGN

  8. Effect of MgO on compositions of the system CaO-Al2O3-Fe2O3. Solubility

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    Palomo, Ángel

    1986-12-01

    Full Text Available Five different compositions belonging to the equilibrium system CaO-Al2O3-Fe2O3 were dopep with a fixed quantity of MgO (6,5% wt. The compositions, which lie in different primary fields of crystallization and in different triangles of compatibility, were submitted to several thermal treatments. Each composition, which had previously been melted, originates in its solidification the aluminates and ferrites which are usual in the interstitial phase of clinker Portland, although they are in different microstructural arrangements. The effect of MgO on the generated microstructures has been shown. Also, the solubility of MgO on the aluminic and ferritic phases has been measured.CCinco composiciones diferentes pertenecientes al sistema de equilibrio CaO-Al2O3-Fe2O3 fueron dopadas con una cantidad fija de MgO (6,5%. Las cinco composiciones, que están situadas sobre diferentes campos primarios de cristalización y/o sobre diferentes triángulos de compatibilidad, fueron sometidas a varios tratamientos térmicos. Cada composición (previamente fundida origina en su solidificación los aluminatos y ferritos habituales en la fase intersticial del clinker portland, aunque ordenados en microestructuras diferentes. Se ha comprobado el efecto del MgO sobre las microestructuras generadas, así como su solubilidad en las fases alumínicas y ferríticas.

  9. Reflexões sobre a linguagem televisiva e sua influência socializadora

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    Débora Burini

    2013-01-01

    Full Text Available O trabalho aborda uma reflexão panorâmica e ensaística sobre o papel da linguagem televisiva dentro da perspectiva de influência socializadora. Tem por objetivo estabelecer uma discussão no campo da produção de conteúdo audiovisual veiculado nas emissoras de televisão, a evolução histórica dos modos de produção e a relação estabelecida entre quem edita e quem assiste, tendo como mediador a estética do veículo e a evolução tecnológica. Parte do estudo do veículo e da técnica inserida em seu modus operandi, através das obras de Sérgio Mattos, Raymond Willians e Walter Bonásio, e da compreensão da mensagem, com apoio das obras de Karl Popper e Joan Ferrés.

  10. Fructification phenology as an important tool in the recovery of iron mining areas in Minas Gerais, Brazil.

    Science.gov (United States)

    Garcia, L C; Barros, F V; Lemos-Filho, J P

    2009-08-01

    'Canga' is a name given to the ferruginous rocky fields that can be found in the 'Quadrilátero Ferrífero' of Minas Gerais, Brazil. The endemism and species richness make them areas of special biological importance, regarded as high-priority for conservation. Nevertheless, they are being threatened by intense mining activity. Aiming to understand more about this flora, this study was performed in order to determine the maturation or dispersal period of the fruits of four Canga species, Alibertia vaccinioides K.Schum. (Rubiaceae), Coccoloba acrostichoides Cham. (Polygonaceae), Miconia sellowiana Naudin (Melastomataceae), and one probable new species of Calyptranthes Sw. (Myrtaceae). Although fruit maturation or dispersal tended to occur at the end of the dry season, some asynchrony was observed in these species, with food sources being available during most of the year. This shows that these species have the potential to attract animals the whole year round, and planting them for the recovery of iron mining areas may increase the community's self-regeneration capacity, leading to a more successful restoration process.

  11. Capacidad crítica y relación dialógica en el aprendizaje de la comunicación audiovisual y digital

    Directory of Open Access Journals (Sweden)

    Rafael Marfil-Carmona

    2014-06-01

    Full Text Available Las capacidades crítica y expresiva conforman un mismo proceso en la enseñanza y el aprendizaje de la comunicación audiovisual y digital. Las corrientes pedagógicas contemporáneas y las opciones tecnológicas son buenos aliados para el impulso de la creatividad en el reconocimiento de inteligencias múltiples (Gardner, 2011, frente a sistemas desfasados de transmisión vertical del conocimiento. Sin embargo, hay que vigilar que esa tendencia práctica no desatienda la faceta reflexiva. Centrándonos en las dimensiones de la competencia en comunicación audiovisual (Ferrés, 2007, la que se refiere a la percepción, audiencia e interacción cobra una especial importancia en nuestros días, en los que resulta más necesaria que nunca la capacidad crítica, que debe seguir siendo un objetivo prioritario de la educomunicación. Este texto destaca la importancia de esa actitud crítica y desmitificadora, proponiendo la consideración de las TIC como medios para desarrollar modelos dialógicos basados en la relación y el aprendizaje colectivo, de forma que pasan a convertirse en TRIC al añadir la “R” del factor relacional (Gabelas, Marta-Lazo y Aranda, 2012.

  12. New ultra metal-poor stars from SDSS: follow-up GTC medium-resolution spectroscopy

    Science.gov (United States)

    Aguado, D. S.; Allende Prieto, C.; González Hernández, J. I.; Rebolo, R.; Caffau, E.

    2017-07-01

    Context. The first generation of stars formed in the Galaxy left behind the chemical signatures of their nucleosynthesis in the interstellar medium, visible today in the atmospheres of low-mass stars that formed afterwards. Sampling the chemistry of those low-mass provides insight into the first stars. Aims: We aim to increase the samples of stars with extremely low metal abundances, identifying ultra metal-poor stars from spectra with modest spectral resolution and signal-to-noise ratio (S/N). Achieving this goal involves deriving reliable metallicities and carbon abundances from such spectra. Methods: We carry out follow-up observations of faint, V > 19, metal-poor candidates selected from SDSS spectroscopy and observed with the Optical System for Imaging and low-Intermediate-Resolution Integrated Spectroscopy (OSIRIS) at GTC. The SDSS and follow-up OSIRIS spectra were analyzed using the FERRE code to derive effective temperatures, surface gravities, metallicities and carbon abundances. In addition, a well-known extremely metal-poor star has been included in our sample to calibrate the analysis methodology. Results: We observed and analyzed five metal-poor candidates from modest-quality SDSS spectra. All stars in our sample have been confirmed as extremely metal-poor stars, in the [Fe/H] Palma. Programme ID GTC2E-16A and ID GTC65-16B.

  13. Fructification phenology as an important tool in the recovery of iron mining areas in Minas Gerais, Brazil

    Directory of Open Access Journals (Sweden)

    LC. Garcia

    Full Text Available "Canga" is a name given to the ferruginous rocky fields that can be found in the "Quadrilátero Ferrífero" of Minas Gerais, Brazil. The endemism and species richness make them areas of special biological importance, regarded as high-priority for conservation. Nevertheless, they are being threatened by intense mining activity. Aiming to understand more about this flora, this study was performed in order to determine the maturation or dispersal period of the fruits of four Canga species, Alibertia vaccinioides K.Schum. (Rubiaceae, Coccoloba acrostichoides Cham. (Polygonaceae, Miconia sellowiana Naudin (Melastomataceae, and one probable new species of Calyptranthes Sw. (Myrtaceae. Although fruit maturation or dispersal tended to occur at the end of the dry season, some asynchrony was observed in these species, with food sources being available during most of the year. This shows that these species have the potential to attract animals the whole year round, and planting them for the recovery of iron mining areas may increase the community's self-regeneration capacity, leading to a more successful restoration process.

  14. The role of emotionality in the acquisition of new concrete and abstract words.

    Science.gov (United States)

    Ferré, Pilar; Ventura, David; Comesaña, Montserrat; Fraga, Isabel

    2015-01-01

    A processing advantage for emotional words relative to neutral words has been widely demonstrated in the monolingual domain (e.g., Kuperman et al., 2014). It is also well-known that, in bilingual speakers who have a certain degree of proficiency in their second language, the effects of the affective content of words on cognition are not restricted to the native language (e.g., Ferré et al., 2010). The aim of the present study was to test whether this facilitatory effect can also be obtained during the very early stages of word acquisition. In the context of a novel word learning paradigm, participants were trained on a set of Basque words by associating them to their Spanish translations. Words' concreteness and affective valence were orthogonally manipulated. Immediately after the learning phase and 1 week later, participants were tested in a Basque go-no go lexical decision task as well as in a translation task in which they had to provide the Spanish translation of the Basque words. A similar pattern of results was found across tasks and sessions, revealing main effects of concreteness and emotional content as well as an interaction between both factors. Thus, the emotional content facilitated the acquisition of abstract, but not concrete words, in the new language, with a more reliable effect for negative words than for positive ones. The results are discussed in light of the embodied theoretical view of semantic representation proposed by Kousta et al. (2011).

  15. MUEBLES E INTERIORES EN CANET DE MAR 1890-1917

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    Vicente de la Fuente Bermúdez

    2014-01-01

    Full Text Available Entre 1900 y 1910 se produce un auge constructivo en Canet de Mar, población cercana a Barcelona. Reformas o construcciones de nueva planta integran las novedades técnicas, como el gas y después la electricidad; adaptándose a modas y nuevos estilos de vida. El primer edificio construido por Lluís Domènech i Montaner en Canet, en 1884, es el Ateneu. Pere Domènech Roura, su hijo, diseña en 1917, la Casa Serra Pujadas. Entre ambas construcciones se crean interiores decorados en mayor o menor medida con objetos Art Nouveau/Modernistas que conviven con muebles anteriores, reflejando tanto el gusto personal de las familias, como su pasado, con muebles heredados. Junto a las casas para pequeños fabricantes locales destacan los interiores creados por artistas de renombre, como Lluís Domènech i Montaner o Eduard Ferrés i Puig, para grandes fortunas como Ramon de Montaner o Ramir Busquets.

  16. AUMENTO EN LA RESISTENCIA A LA CORROSIÓN DE UN ACERO T91 ALUMINIZADO

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    LUZ S. QUINTERO

    2011-01-01

    Full Text Available El acero ferrítico T91 ha sido ampliamente utilizado en plantas de generación de energía eléctrica, calderas y plantas nucleares. Sin embargo, su resistencia a la oxidación se ve gravemente afectada a temperaturas superiores a los 600ºC. En esta investigación se empleó la técnica de cementación empacada para aluminizar un acero T91 y se encontraron las condiciones óptimas para la formación de un recubrimiento libre de porosidad y con espesor uniforme (300 micras. Se evaluó la capa de óxido formada luego de una exposición a 800ºC en atmósfera de aire. La caracterización del recubrimiento y de la capa de óxido (Al2O3 se llevó a cabo empleando un microscopio electrónico de barrido (SEM, Espectroscopia de Rayos X (EDX y mapping. Se comprobó una buena resistencia a la oxidación del acero T91 aluminizado, debido a la formación de una fina capa continua de óxido de aluminio de aproximadamente 6 micras de espesor luego de una exposición de 7 días.

  17. Compatibility between the entomopathogenic fungus Beauveria bassiana and insecticides used in coffee plantations Compatibilidade entre o fungo entomopatogênico Beauveria bassiana e inseticidas usados na cultura do cafeeiro

    Directory of Open Access Journals (Sweden)

    Carolina Natali de Oliveira

    2003-12-01

    Full Text Available Microbial control in integrated pest management (IPM programs of coffee plantations is an important factor for the reduction of pest population densities. The use of selective pesticides can be associated with entomopathogens, increasing the efficiency of the control and reducing the use of required insecticides. The in vitro fungitoxic effect of insecticide formulations of Thiamethoxam, Cyfluthrin, Deltamethrin, Alpha-Cypermethrin, Triazophos, Chlorpyrifos, Fenpropathrin and Endosulfan and Beauveria bassiana (CG 425 strain was evaluated at three concentrations (FR = average field recommendation; 0.5 ´ FR and 2 ´ FR. Effects of these products on conidia germination, vegetative growth and sporulation were compared. Only five insecticides, at the FR concentration, promoted conidia viability higher than 60%. Viability should be considered the most important factor to be evaluated since it is the first step of the infection process. The insecticide formulations of Alpha-Cypermethrin, Thiamethoxam and Cyfluthrin caused the lower inhibition level on conidia germination at the two lower concentrations, with no difference in relation to the control. With respect to vegetative growth analysis, Thiamethoxam at the two lower concentrations was not found to cause radial growth inhibition. Thiamethoxam caused the smallest inhibition level with regard to conidia production. The use of Alpha-Cypermethrin and Thiamethoxam formulations in coffee IPM programs for a B. bassiana inoculum conservation strategy are recommended, since these products were compatible with the entomopathogenic fungus Beauveria bassiana (CG 425, an important natural control agent of the coffee berry borer, Hypothenemus hampei.Em programas de Manejo integrado de pragas (MIP deve-se considerar o controle microbiano como um importante fator de redução da densidade populacional de pragas. A utilização de produtos seletivos quando associados a patógenos, pode aumentar a eficiência de

  18. Distribución espacio-temporal de hormigas en un gradiente de luz, dentro de un sistema agroforestal de café, en Turrialba, Costa Rica

    Directory of Open Access Journals (Sweden)

    Edgar H Varón

    2007-12-01

    Full Text Available En los sistemas agroforestales de café (Coffea arabica L. de Mesoamérica es frecuente la presencia de árboles de sombra. Estos sistemas pueden albergar una rica entomofauna, incluyendo hormigas, la cuales podrían depredar a plagas claves en dichos sistemas. Sin embargo, se desconoce el papel de la sombra sobre la distribución y abundancia de dichas hormigas, lo cual podría sugerir pautas para manipular ciertas condiciones de su hábitat y lograr su conservación e incremento. Por tanto, se estudió el efecto de la sombra sobre la distribución espacial y temporal de tres especies de hormigas (Solenopsis geminata, Pheidole radoszkowskii y Crematogaster curvispinosa que pueden depredar a la broca del café, Hypothenemus hampei (Coleoptera: Scolytidae y al barrenador de las meliáceas, Hypsipyla grandella. Para ello se evaluó su abundancia a través de un gradiente de sol-sombra en un cafetal con cuatro parcelas alternas (desde pleno sol hasta sombra total, en Turrialba, Costa Rica. En la comunidad estudiada se recolectaron 28 especies de hormigas, de las cuales S. geminata fue la dominante (79 % del total de individuos, seguida por P. radoszkowskii (16 %. S. geminata y C. curvispinosa prefirieron las áreas soleadas, mientras que P. radoszkowskii no mostró una preferencia definida. Asimismo, en cuanto a su ubicación, S. geminata predominó en el suelo, mientras que P. radoszkowskii y C. curvispinosa lo hicieron en los arbustos de café.Temporal and spatial distribution of ants in a light gradient, in a coffee agroforestry system, Turrialba, Costa Rica. Shade trees are frequently present in coffee (Coffea arabica L. agroforestry systems of Mesoamerica. These systems can harbor a rich entomofauna, including ants, which could be predators of key pests in these systems. However, the role of shade on the distribution and abundance of these ants is unknown, yet such knowledge could suggest guidelines for manipulating certain environmental

  19. Seed-Specific Stable Expression of the α-AI1 Inhibitor in Coffee Grains and the In Vivo Implications for the Development of the Coffee Berry Borer.

    Science.gov (United States)

    Albuquerque, Érika V S; Bezerra, Caroline A; Romero, Juan V; Valencia, Jorge W A; Valencia-Jiménez, Arnubio; Pimenta, Lucas M; Barbosa, Aulus E A D; Silva, Maria C M; Meneguim, Ana M; Sá, Maria Eugênia L; Engler, Gilbert; de Almeida-Engler, Janice; Fernandez, Diana; Grossi-de-Sá, Maria F

    Genetic transformation of coffee ( Coffea spp.), the second most traded commodity worldwide, is an alternative approach to introducing features that cannot be introgressed by traditional crossings. The transgenic stability, heritability and quantitative and spatial expression patterns of the seed-specific promoter phytohemagglutinin (PHA-L) from Phaseolus vulgaris were characterized in genetically modified C. arabica expressing the α-amylase inhibitor-1 ( α-AI1 ) gene. The α-AI1 inhibitor shows considerable activity toward digestive enzymes of the coffee berry borer (CBB) Hypothenemus hampei . This insect pest expends its life cycle almost entirely in coffee berries. Transgene containment in the fruit is important to meeting food and environmental safety requirements for releasing genetically modified (GM) crops. PCR analysis of T2 coffee plants showed a Mendelian single-copy segregation pattern. Ectopic transgene expression was only detected in coffee grains, as demonstrated by reverse transcription-PCR analysis of different plant tissues. An intense immunocytochemical signal associated with α-AI1 protein expression was localized to endospermic cells. In addition, a delay in the larval development of CBB was observed after challenging transgenic coffee seeds with the insect. These results indicate that the PHA-L promoter might be a useful tool in coffee for the seed-specific expression of genes related to coffee bean productivity, quality and pest protection. The biotechnological applicability of the α-AI1 gene for controlling CBB is also discussed. This work is the first report showing a seed-specific transgene expression in coffee plants.

  20. Flight Activity and Field Infestation Relationships for Coffee Berry Borer in Commercial Coffee Plantations in Kona and Kau Districts, Hawaii.

    Science.gov (United States)

    Aristizábal, Luis F; Shriner, Suzanne; Hollingsworth, Robert; Arthurs, Steven

    2017-12-05

    The coffee berry borer (CBB), Hypothenemus hampei Ferrari (Coleoptera: Curculionidae: Scolytinae) is a recent invader to Hawaii. To date, limited information regarding the seasonal phenology of this pest on the islands limits the implementation of integrated control strategies. As part of a coffee farmer training program, we monitored CBB flight activity in 15 coffee plantations (Kona and Kau Districts) over 10 mo with methanol-ethanol (3:1 ratio) baited traps. Concurrently, we quantified CBB infestation and penetration rates inside developing coffee berries through the end of harvest. Approximately 1 million CBB were captured, with the highest activity (e.g., >500 CBB/trap/wk) in December through February, coinciding with end of main regional harvesting periods. Relatively high activity (>250 CBB/trap/wk) was also observed during berry development, in May and June (Kona) and June and July (Kau). Field infestation rates were higher overall in Kau (9.6 ± 1.1%) compared with coffee plantations in Kona (4.7 ± 0.4%). Linear regression investigated relationships between CBB trap data and berry infestation rates. Trap catch data generally correlated better with the proportion of shallow entries (AB position) compared with deeper penetrations (CD position) or total infestation. Pearson correlation coefficients based on different parameters (i.e., region, altitude, and berry phenology) revealed positive and mostly significant correlations between these variables (R values 0.410 to 0.837). Timing peak flight activity of CBB with insecticide applications will help coffee growers improve pest control. The ability of trap data to calculate reliable economic (action) thresholds for the CBB is discussed. © The Author(s) 2017. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

  1. Pest Management Strategies Against the Coffee Berry Borer (Coleoptera: Curculionidae: Scolytinae).

    Science.gov (United States)

    Infante, Francisco

    2018-03-22

    Coffee ( Coffea arabica and C. canephora) is one of the most widely traded agricultural commodities and the main cash crop in ∼80 tropical countries. Among the factors that limit coffee production, the coffee berry borer, Hypothenemus hampei (Ferrari) has been considered the main insect pest, causing losses of over U.S. $500 million dollars annually. Control of this pest has been hindered by two main factors: the cryptic nature of the insect (i.e., protected inside the coffee berry) and the availability of coffee berries in the field allowing the survival of the pest from one generation to the next. Coffee berry borer control has primarily been based on the use of synthetic insecticides. Management strategies have focused on the use of African parasitoids ( Cephalonomia stephanoderis, Prorops nasuta, and Phymastichus coffea), fungal entomopathogens ( Beauveria bassiana), and insect traps. These approaches have had mixed results. Recent work on the basic biology of the insect has provided novel insights that might be useful in developing novel pest management strategies. For example, the discovery of symbiotic bacteria responsible for caffeine breakdown as part of the coffee berry borer microbiome opens new possibilities for pest management via the disruption of these bacteria. Some chemicals with repellent propieties have been identified, and these have a high potential for field implementation. Finally, the publication of the CBB genome has provided insights on the biology of the insect that will help us to understand why it has been so successful at exploiting the coffee plant. Here I discuss the tools we now have against the CBB and likely control strategies that may be useful in the near future.

  2. Evaluación de aislamientos nativos de Beauveria Spp. sobre Tecia solanivora (Lepidoptera: Gelechiidae in vitro

    Directory of Open Access Journals (Sweden)

    Jorge Enrique Villamil

    2014-06-01

    Full Text Available Se evaluó la eficacia de hongos entomopatógenos nativos en el biocontrol de Tecia solanivora (Lepidoptera: Gelechiidae in vitro. Los aislamientos fueron obtenidos de larvas y adultos de gusano blanco Premmotrypes vorax, barrenador del curubo Aepytus sp, picudo de la palma Rinchophorus palmarum, broca del café Hypothenemus hampei, polilla guatemalteca Tecia solanivora y palomilla de la papa Phthorimaea operculella infectados, de los municipios de Ventaquemada, Umbita, Coper (Boyacá y San gil (Santander. El trabajo se realizó en el laboratorio de control biológico del Grupo Manejo Biológico de Cultivos en Tunja, Colombia. Se seleccionaron in vitro, de forma preliminar cinco de los siete aislamientos de hongos obtenidos: Bv01, Bv03, Bv04, Bv05 y Bv07, los cuales ocasionaron mortalidades superiores al 10%. De acuerdo con la caracterización morfológica realizada, los hongos encontrados pertenecen al género Beauveria. La evaluación de su eficacia se realizó con 10 larvas de T. solanivora desinfectadas y sumergidas en suspensión de 1x107esporas.mL-1, las cuales se observaron durante 32 días, registrando cada 8 días la mortalidad. Se empleó un diseño completamente al azar, con 6 tratamientos, 4 repeticiones y una prueba de separación de medias de Tukey. Los resultados mostraron que 32 días después de la inoculación los aislamientos Bv03 y Bv05 fueron los que produjeron la mayor mortalidad acumulada (7,4 y 8,5%, respectivamente. Se confirma el bajo potencial de los hongos entomopatógenos nativos para el control de larvas de T. solanivora.

  3. Bark and Ambrosia Beetle (Curculionidae: Scolytinae) Diversity Found in Agricultural and Fragmented Forests in Piracicaba-SP, Brazil.

    Science.gov (United States)

    Sandoval Rodríguez, Carla; Cognato, Anthony I; Righi, Ciro Abbud

    2017-12-08

    Land use changes and forest fragmentation result in biodiversity loss and displacement, with insects among the most affected groups. Among these, bark beetles (Curculionidae: Scolytinae) occupy a prominent position due to their close ties to food resources, i.e., trees, and importance as primary decomposers in forest ecosystems. Therefore, our study aimed to document scolytine biodiversity associated with landscape components that vary based on their physical or botanical composition. Bark beetle diversity was sampled monthly for 12 mo in an Atlantic forest remnant and five adjacent vegetation plots (mixed Agroforestry System-AFS, of native trees and fruit species; AFS of rubber trees and coffee plants; coffee monoculture; rubber monoculture; and pasture). In total, 1,833 individuals were sampled from 38 species of which 24 (63%) were detected in very low abundance. The remaining 14 species were more abundant and widespread almost in all areas. Hypothenemus hampei (Westwood), Premnobius cavipennis (Eichhoff), Hypothenemus sp1., and Xyleborus volvulus (Fabricius) were the most abundant. The greatest abundance and richness of bark beetles were found in the dry and cold season. The varied microclimatic conditions of the vegetation plots greatly affected the diversity of the Scolytinae. Solar radiation presented a significant negative effect on abundance in almost all the studied areas. The greatest scolytine diversity was found in anthropic areas with tree canopy structure. Open areas (pasture and coffee monocrop) had a lower species diversity. Similarly, a lower abundance and species richness were found for the Atlantic forest remnant. © The Authors 2017. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

  4. Ecological and economic services provided by birds on Jamaican Blue Mountain coffee farms.

    Science.gov (United States)

    Kellermann, Jherime L; Johnson, Matthew D; Stercho, Amy M; Hackett, Steven C

    2008-10-01

    Coffee farms can support significant biodiversity, yet intensification of farming practices is degrading agricultural habitats and compromising ecosystem services such as biological pest control. The coffee berry borer (Hypothenemus hampei) is the world's primary coffee pest. Researchers have demonstrated that birds reduce insect abundance on coffee farms but have not documented avian control of the berry borer or quantified avian benefits to crop yield or farm income. We conducted a bird-exclosure experiment on coffee farms in the Blue Mountains, Jamaica, to measure avian pest control of berry borers, identify potential predator species, associate predator abundance and borer reductions with vegetation complexity, and quantify resulting increases in coffee yield. Coffee plants excluded from foraging birds had significantly higher borer infestation, more borer broods, and greater berry damage than control plants. We identified 17 potential predator species (73% were wintering Neotropical migrants), and 3 primary species composed 67% of migrant detections. Average relative bird abundance and diversity and relative resident predator abundance increased with greater shade-tree cover. Although migrant predators overall did not respond to vegetation complexity variables, the 3 primary species increased with proximity to noncoffee habitat patches. Lower infestation on control plants was correlated with higher total bird abundance, but not with predator abundance or vegetation complexity. Infestation of fruit was 1-14% lower on control plants, resulting in a greater quantity of saleable fruits that had a market value of US$44-$105/ha in 2005/2006. Landscape heterogeneity in this region may allow mobile predators to provide pest control broadly, despite localized farming intensities. These results provide the first evidence that birds control coffee berry borers and thus increase coffee yield and farm income, a potentially important conservation incentive for producers.

  5. INFESTACIÓN E INCIDENCIA DE BROCA, ROYA Y MANCHA DE HIERRO EN CULTIVO DE CAFÉ DEL DEPARTAMENTO DEL CAUCA ESTUDO DE INFESTAÇÃO E INCIDÊNCIA DA BROCA, A FERRUGEM E A CERCOSPOREOSE O CULTIVO DO CAFÉ NO DEPARTAMENTO DO CAUCA INFESTATION AND INCIDENCE STUDY OF THE COFFEE BORER, COFFEE RUST AND IRON SPOT DISEASE ON THE COFFEE CROP IN CAUCA DEPARTMENT

    Directory of Open Access Journals (Sweden)

    CONSUELO MONTES R.

    2012-06-01

    Full Text Available El estudio de incidencia e infestación de plagas limitantes para café como Roya (Hemileia vastatrix, Broca (Hypothenemus hampei, y Mancha de hierro (Cercospora coffeicola, se desarrolló entre marzo de 2006 y Diciembre de 2007 en cuatro municipios con ocho predios sensores. Se realizaron muestreos mensuales para incidencia e infestación de cada plaga. Se siguió la metodología propuesta por CENICAFÉ, 30 árboles/ha para evaluar infestación de Broca e incidencia de la Mancha de hierro y 10 para incidencia de Roya. Se registro temperatura, precipitación, humedad relativa y brillo solar para relacionar el comportamiento de las plagas con el clima. La incidencia e infestación superaron significativamente el umbral de daño económico (5% para cada plaga. El promedio de incidencia fue de 14,7% para Roya y 4,8% para Mancha de hierro, el de infestación para Broca fue de 4,7%. La temperatura y precipitación presentaron gran relación con la dinámica epidemiológica de las plagas. Altas temperaturas están relacionadas con alta incidencia e infestación de Roya y Broca, principalmente entre junio y septiembre, contrariamente a la Mancha de hierro que estuvo relacionada con alta precipitación, principalmente entre marzo y mayo. Estos resultados alertan acerca de la presencia de estas plagas en los cultivos de la región.No departamento do Cauca foi realizado um estudo epidemiologico de três pragas limitantes na produção de café (Coffea arabica: a ferrugem produzida pelo fungo Hemileia vastatrix, a Broca do café produzida pelo inseto Hypothenemus hampei, e a cercosporiose produzida pelo fungo Cercospora coffeicola. O estudo foi feito nos anos 2006 e 2007 em quatro municipios onde foram escolhidos 8 fazendas nas que foram realizadas amostragens para obter a percentagem de apresentação das doenças. As amostragens foram feitas segundo a metodología proposta pelo CENICAFE. Trinta arbores por hectare foram avaliados para determinar a precen

  6. Effect of pH on the copigmentation of anthocyanins from Cabernet Sauvignon grape extracts with organic acids Efeito do pH na copigmentação de antocianinas do extrato de uvas Cabernet Sauvignon com ácidos orgânicos

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    Cony Gauche

    2010-02-01

    Full Text Available Anthocyanins show low-stability when exposed to different food processing conditions. Copigmentation is one of the main reactions contributing to the in vivo color responsible to the stability of anthocyanins. In the aim of holding the red color, copigmentation effect of organic acids (caffeic, ferulic, gallic and tannic acids combined with anthocyanins in crude Cabernet Sauvignon (Vitis vinifera L. grape skin extract at pH values (1.0, 2.0, 3.0, 3.3, 3.5, 3.7, 4.0, 4.5 was evaluated in this research. The maximum copigmentation effect, revealed by the hyperchromic and bathochromic shifts in anthocyanin maximum absorbance wavelength, was obtained at pH 3.3 with every acid used. Anthocyanin stability was followed by measuring the loss of color, thus it was possible to determine the protecting effects of these copigments. Tannic acid was the best copigment in our model system, giving half-life time of 2,585 h. We are suggesting the formation of pyranoanthocyanins by the reactions of anthocyanins with caffeic and ferulic acid, these substances could be avoiding the observation of the copigmentation effect. Addition of organic acids could improve the anthocyanin stability; though, more studies are needed to justify the lack of copigmenting effect observed with the caffeic and ferulic acids.Antocianinas apresentam baixa estabilidade frente aos fatores que afetam o processamento de alimentos. A copigmentação é uma das principais reações responsáveis pela estabilidade da coloração de antocianinas in vivo. Com objetivo de manter a coloração vermelha, a copigmentação das antocianinas do extrato bruto de uvas Cabernet Sauvignon (Vitis vinifera L. com ácidos orgânicos (ácidos caféico, ferrúlico, gálico e tânico em diferentes valores de pH (1,0; 2,0; 3,0; 3,3; 3,5; 3,7; 4,0; 4,5 foi avaliada neste estudo. O efeito máximo de copigmentação, revelado pelos deslocamentos hipercrômico e batocrômico, foi obtido em pH 3,3 para todos os

  7. Kinetics of manganese in MAG/MIG welding with a 18/8/6 wire

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    Tušek, Janez

    2001-06-01

    Full Text Available The paper deals with a study of MAG/MIG welding of low-alloy ferritic steel and highalloy austenitic steel with a 18/8/6 wire. Manganese burn-off from the wire in welding a single-V butt weld was studied. It was found that manganese burns off in the arc during melting of a droplet at the wire end, and from the weld pool during weld formation. The range of manganese burn-off depends mainly on the type of shielding gas used and the arc length, i.e., from the arc voltage. The manganese burn-off increases with an increase of the content of active gases, i.e., CO2 and O2, in the neutral gas, i.e., argon. It also increases with an increase in arc voltage. The longer the welding arc, the longer exposition of the filler material to the welding arc and the wider the penetration, which allows manganese vapours to evaporate from the weld pool. The most important finding is that manganese burn-off from the 18/8/6 wire during welding of austenitic stainless steel with low-alloy ferritic steel is considerably strong, i.e., from 20% to 30%; nevertheless the wire concerned is perfectly suitable for welding of different types of steel.

    El artículo describe el estudio de un acero ferrítico poco aleado con un acero austenítico altamente aleado con el alambre 18/8/6 mediante el procedimiento MAG/MIG. Se ha investigado el consumo del manganeso del alambre durante la soldadura a tope con la preparación en V. Con los análisis se ha comprobado que el manganeso se consume en el arco desde la formación de la gota en la punta del alambre hasta la solidificación del metal aportado fundido. La cantidad perdida del manganeso depende, sobre todo, del tipo del gas de protección y de la longitud del arco, esto es, de la tensión convencional en el arco. Con el aumento de los gases activos (CO2 y O2 respecto al gas neutro argon, el consumo del manganeso va aumentando. También se observó que el consumo del manganeso va

  8. Reconstruction of past climate variability in SE Spain between 14 and 8 ka

    Science.gov (United States)

    Budsky, Alexander; Scholz, Denis; Mertz-Kraus, Regina; Christoph, Spötl; Gibert, Luis; Jochum, Klaus Peter; Andreae, Meinrat O.

    2016-04-01

    . Budsky, A., Scholz, D., Gibert, L., Mertz-Kraus, R., 2015. 230Th/U-dating of the Cueva Victoria flowstone sequence: Preliminary results and paleoclimate implications, in: Gibert, L., Ferràndez-Canadell, C. (Eds.), Geology and Paleontology of Cueva Victoria. Mastia 11-13, Cartagena, pp. 101-109. Gibert, L., Scott, G.R., Scholz, D., Budsky, A., Ferràndez, C., Ribot, F., Martin, R.A., Lería, M., 2016. Chronology for the Cueva Victoria fossil site (SE Spain): Evidence for Early Pleistocene Afro-Iberian dispersals. Journal of Human Evolution 90, 183-197.

  9. Chemical composition, botanical evaluation and screening of radical scavenging activity of collected pollen by the stingless bees Melipona rufiventris (Uruçu-amarela

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    Tania M.S. Silva

    2009-06-01

    Full Text Available Stingless bees in Brazil are indigenous and found all over the country. Bee pollen is used for its nutritional value in the human diet. It is made up of natural flower pollen mixed with nectar and bee secretions. In order to evaluate the chemical composition, free radical scavenging activity, and botanical origin, sample of pollen loads from stingless bee, Melipona rufiventris (Uruçu amarela was studied. The EtOAc extract of pollen of Melipona rufiventris yielded the following compounds: p-hydroxycinnamic acid, dihydroquercetin, isorhamnetin, isorhamnetin3-O-(6"-O-E-p-coumaroyl-β-D-glucopyranoside, luteolin, and quercetin. This is the first report of the isolation of isorhamnetin3-O-(6"O-E-p-coumaroylβ-D-glucopyranoside from pollen. The free radicalscavenging activities of different solvent extracts of pollen were determined using DPPH assay. This activity decreases in the order: EtOAc>EtOH>Hexane extract. It appears that the EtOAc extract of the pollen is a good scavenger of active oxygen species. The botanical evaluation of pollen loads showed the composition by two pollen types, with the dominant type (97.3% being Scopariadulcis (L. (Scrophulariaceae and the minor one Senna obtusifolia (L. Irwin & Barneby (Fabaceae. This suggests a specific foraging behavior in Melipona rufiventris bees, even in an environment with such a rich botanical diversity as the Northeastern Brazil.As abelhas sem ferrão são espécies indígenas encontradas em todo o Brasil. Seu pólen é utilizado devido ao seu valor nutricional na dieta humana. É produzido a partir de pólen floral misturado com néctar e líquidos secretados pelas abelhas. Visando avaliar a composição química, a atividade sequestradora de radicais livres e a origem botânica foi estudado o pólencoletado pela abelha sem ferrão Melipona rufiventris (Uruçu-amarela. Do extrato acetato de etila foram isolados os compostos: ácido phidroxicinâmico, dihidroquercetina, isoramnetina, 3O(6

  10. Meliponini neotropicais: o gênero Ptilotrigona Moure (Hymenoptera, Apidae, Apinae

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    João M. F. Camargo

    2004-01-01

    Full Text Available O gênero neotropical de abelhas sem ferrão, Ptilotrigona Moure, 1951, é revisado. Três espécies são reconhecidas: Ptilotrigona occidentalis (Schulz, 1904, endêmica do NW da América do Sul - do NW do Equador até o sul de Darién -, e com uma população isolada na Península de Osa - Costa Rica; P. pereneae (Schwarz, 1943, endêmica do oeste da Amazônia, e P. lurida (Smith, 1854, amplamente distribuída na Amazônia. Ptilotrigona lurida e P. pereneae são as únicas abelhas sem ferrão que estocam pólen em associação com leveduras (Candida sp. e produzem pouco ou nenhum mel. Ninhos são descritos e ilustrados. Holótipos de Trigona suffragata Cockerell, 1922 (sin. de P. occidentalis e Trigona manni Cockerell, 1912, e exemplares de Trigona heideri Friese, 1900 (sins. de P. lurida, identificados por Friese, e um parátipo de Trigona (Tetragona heideri pereneae Schwarz, 1943, são estudados. Novo sinônimo: Ptilotrigona lurida (Smith, 1854 = Trigona mocsaryi lutea Friese, 1903 syn. nov. Na análise cladística, espécies de Camargoia Moure, 1989, e Tetragona Lepeletier & Serville, 1828, foram incluídas como grupos externos; a hipótese apresentada é a seguinte: ((((Ptilotrigona lurida, P. pereneae P. occidentalis((Camargoia nordestina, C. pilicornis C. camargoi Tetragona goettei. Uma chave de identificação para as espécies e outros aspectos bionômicos também são apresentados.Neotropical Meliponini: the genus Ptilotrigona Moure, (Hymenoptera, Apidae, Apinae. The Neotropical stingless bees genus Ptilotrigona Moure, 1951 is revised. Three species are recognized: Ptilotrigona occidentalis (Schulz, 1904, endemic to NW South America - from NW Ecuador to southern Darién -, and with one isolated population in Osa Peninsula - Costa Rica; P. pereneae (Schwarz, 1943, endemic to the western Amazon; and P. lurida (Smith, 1854, largely distributed in the Amazon region. Ptilotrigona lurida and P. pereneae are the only known stingless bees

  11. Variabilidade genética e ecológica de Stylosanthes macrocephala determinadas por RAPD e SIG Genetic and ecological variability of Stylosanthes macrocephaladetermined by RAPD markers and GIS

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    Ana Maria Barros

    2005-09-01

    Full Text Available Stylosanthes macrocephala M. B. Ferr. et S. Costa é uma leguminosa utilizada sob consorciação em pastagens, adubação e recuperação de áreas degradadas. A falta de características morfológicas e agronômicas estáveis e de informações ecogeográficas dos locais de coleta dos acessos tem dificultado o melhoramento genético da espécie. A fim de obter descritores ecológicos, moleculares e avaliar a variabilidade genética da coleção de S. macrocephala, 87 acessos foram analisados com o auxílio do Sistema de Informações Geográficas (SIG e de marcadores moleculares RAPD. Os acessos provieram de sete Estados, cinco bacias hidrográficas, sete tipos de vegetação e sete tipos de solos. As altitudes dos locais de coleta variaram de 1 a 1.298 m e a pluviometria anual média de 550 a 2.870 mm. A variabilidade de descritores ecológicos sugeriu diversidade adaptativa na coleção. Com base em 161 marcadores RAPD, verificou-se que as distâncias genéticas entre os acessos de S. macrocephala variaram entre 0,02 e 0,42. Com base nessas distâncias, dez grupos de similaridade genética foram estabelecidos. Observou-se tendência de separação por bacias hidrográficas e elevada variabilidade gen��tica entre os acessos coletados nos estados da Bahia e de Minas Gerais. A alta variabilidade genética da coleção de S. macrocephala evidencia a importância desses acessos para futuros trabalhos de melhoramento genético.Stylosanthes macrocephala M. B. Ferr et S. Costa is a leguminous species used as forage, cover crop and as a pioneer plant to recover degraded areas. Inexistence of stable morphological descriptors and lack of ecogeographic information about collecting sites bring difficulties to the studies of this species. The objective of this work was to use the geographic information system (GIS and RAPD markers to obtain ecological and molecular descriptors and to study the genetic variability of 87 S. macrocephala accessions. The

  12. Use of the X-Ray diffraction technique in the assessment of air quality at Presidente Antônio Carlos Avenue, Belo Horizonte

    Energy Technology Data Exchange (ETDEWEB)

    Cesar, Raisa Helena Sant’Ana; Barreto, Alberto Avelar; Cruz, Ananda Borjaille; Barbosa, João Batista Santos, E-mail: raisa.cesar@cdtn.br, E-mail: aab@cdtn.br, E-mail: abc@cdtn.br, E-mail: jbsb@cdtn.br [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte/MG (Brazil); Silva, Igor Felipe Moura, E-mail: igorfelipedx@ufmg.br [Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG (Brazil). Departamento de Energia Nuclear

    2017-07-01

    Belo Horizonte is the sixth most populous city in Brazil, has the third largest fleet of vehicles and it is close to large mineralogical reserves, such the Quadrilátero Ferrífero. These factors, coupled with the industrial growth and civil construction, raise questions about society regarding ambient air quality. A historically problematic contaminant is the particulate matter (PM), a mixture of solid and liquid particles in suspension that generate environmental damage and human health. These particles can cause from a simple infection to death, being their dimension a fundamental factor to evaluate the impact caused. In this context, this research investigated the air quality due to PM10 (particles less than 10 microns) in a high traffic flow of Minas Gerais capital, Presidente Antônio Carlos Avenue. This avenue is one of the main accesses to the region of Pampulha, an area of great tourist and sporting relevance of the city and has undergone works of duplication and implementation of exclusive lanes for public transport buses due to the realization of the 2014 World Cup. Involved monitoring in the avenue in the year 2014 in order to collect the PM10 present in the ambient air. The characterization of PM10 occurred with the use of the X-ray diffraction technique, one of the main tools of mineralogical characterization, due to its simplicity, speed and reliability of the obtained results. The minerals detected by the analysis were evaluated for their possible origin, generating information for the evaluation of PM10 emitting sources that are fundamental for the management of air quality in the city. (author)

  13. (U-Th)/He geochronology of goethite and the origin and evolution of cangas

    Science.gov (United States)

    Monteiro, Hevelyn S.; Vasconcelos, Paulo M.; Farley, Kenneth A.; Spier, Carlos A.; Mello, Claudio L.

    2014-04-01

    (U-Th)/He geochronology of 147 grains of goethite cements extracted from ferruginous duricrusts (cangas) developed on banded iron-formations from the Quadrilátero Ferrífero region, Minas Gerais, Brazil, records a history of protracted mineral dissolution-reprecipitation that started at ca. 48.1 ± 4.8 Ma and continues intermittently until the Present. A large majority of the samples (more than 30%) are younger than 2 Ma, revealing active mineral dissolution-reprecipitation in the recent past. Within cangas, goethite cements are younger near the surface and become progressively older towards the bottom of the weathering profile, indicating that iron is more effectively cycled in the parts of the weathering profile more strongly affected by biogenic activity. (U-Th)/He geochronology of 14 goethite grains from saprolites in the same profiles yield results ranging from 55.3 ± 5.5 to 25.7 ± 2.6 Ma. For a single weathering profile, goethite cements from cangas are invariably younger than goethite grains from the underlying saprolite, indicating that the duricrust and the saprolite behave as independent and separate systems responding to different environmental controls. Thorium shows conservative behaviour during goethite dissolution-reprecipitation, and it is enriched towards the surface of the weathering profile. Uranium, on the other hand, is preferentially leached from the surface into the saprolite or out of the weathering profile. Recurrent goethite dissolution-reprecipitation lends great textural complexities to cangas, but it is also responsible for its capacity to reheal when physically disrupted. This self-healing property accounts for canga’s role in armoring banded iron-formation landscapes.

  14. Cosmogenic 3He in hematite and goethite from Brazilian "canga" duricrust demonstrates the extreme stability of these surfaces

    Science.gov (United States)

    Shuster, David L.; Farley, Kenneth A.; Vasconcelos, Paulo M.; Balco, Greg; Monteiro, Hevelyn S.; Waltenberg, Kathryn; Stone, John O.

    2012-05-01

    Helium isotopes were measured in hematite and goethite samples from several lateritiric duricrusts (canga) developed on banded iron formations. These samples uniformly have high 3He concentrations which must arise from long periods of cosmic ray exposure. From coexisting phases from the Quadrilátero Ferrífero in east central Brazil, we determined the ratio of cosmogenic 3He in hematite to that of 21Ne in quartz to be 3.96 ± 0.19. Combined with best current estimates of the 21Ne production rate in quartz, this ratio implies a sea-level high latitude (SLHL) 3He production rate in hematite of 68.1 ± 8.1 atoms/g/yr; from the chemical composition we estimate the 3He production rate in goethite to be ~ 5% higher. We use these production rate estimates to interpret 3He concentrations measured in goethite and hematite from a ~ 10 m depth profile collected from a surface canga in Carajás, in the Amazon basin of Brazil. We find that the Carajás canga has experienced a very low rate of surface erosion (~ 0.16-0.54 m/Myr) over at least the last few millions of years. This iron-rich canga surface is remarkably resistant to erosion despite its location in a wet tropical environment. Details of the depth profile suggest that despite its stability, the canga has also been internally dynamic (translocation of material; solution and reprecipitation) over million-year timescales.

  15. Estudo sobre os teores de Tório, Urânio e Potássio nas águas superficiais e sedimento marginal do Rio Piracicaba, Minas Gerais, Brasil

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    Marluce Teixeira Andrade Queiroz

    Full Text Available RESUMO: Nesse estudo, o principal objetivo foi mensurar a concentração de tório, urânio e potássio aplicando a técnica da análise por Ativação Neutrônica Instrumental em dois compartimentos ambientais, águas superficiais e sedimento marginal, do rio Piracicaba, em Minas Gerais. Esse rio possui área de drenagem que inclui as regiões do Quadrilátero Ferrífero da Região do Vale do Aço, sujeitando-se a intensa ação antropogênica. As amostragens ocorreram em quatro pontos de coleta, localizados nos municípios de Fonseca, Rio Piracicaba, Nova Era e Ipatinga, nas estações seca e chuvosa. As concentrações determinadas para aqueles elementos no sedimento se apresentaram elevadas em comparação com os valores usualmente observados para o perfil geológico na região de estudo, denotando relação com o modelo de exploração econômica, notadamente com a mineração e siderurgia. Evidencia, também, a relação com a degradação do feldspato potássico e do quartzo. Na água superficial, constatou-se o incremento da concentração do tório e potássio em comparação com os valores do Conselho Nacional do Meio Ambiente (CONAMA, nº. 357/2005. Os achados desse estudo explicitaram a necessidade da adoção de medidas mitigadoras, visando a contenção dos danos ambientais.

  16. The case of “Fazenda Ermida” in Jundiaí [SP]: the coffee contribution to design of the cultural landscape

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    André Munhoz de Argollo Ferrão

    2008-07-01

    Full Text Available We focus this article on the transformation of the rural and urban landscape from the coffee production and its apparatuses, with the objective of analyzing how the dividing line between urban and rural territory dilutes as the extent that coffee raises the need for urban support for its development. In this case, the city, as a way of life, is featuring and introducing new paradigms in rural areas, which can be seen in the architecture and the means of production. “Fazenda Erminda”, located in Jundiaí (a county of São Paulo state, Brazil, was selected as a study object, which its rural architecture will be characterized on the basis of the buildings, according to the cultural heritage and the landscapes available. The architectural characteristics of a territorial portion leads to the recognition of cultural heritage, possibly existing, as a significant economic and educational value. When this property is part of a strategy focused on memory recovery and its importance to the identity of the beneficiary communities, it could contribute to the thinking of occupation alternatives and ownership of the property. The analysis we here propose is based on the methodology of Argollo Ferrão (2004 approach, which has two vectors, cultural and productive, recording the architecture of the productionbased on the coffee cycle, and also presents the possibility of approaching to the object of Study in four levels: regional, production unit, buildings and machinery, and finally the agro ecological level.

  17. Biomarkers for hepatocellular carcinoma: diagnostic and therapeutic utility

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    Ferrín G

    2015-04-01

    Full Text Available Gustavo Ferrín,1,2 Patricia Aguilar-Melero,1 Manuel Rodríguez-Perálvarez,1,2 José Luis Montero-Álvarez,1,2 Manuel de la Mata1,2 1Liver Unit, Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC, Hospital Universitario Reina Sofía, Córdoba, Spain; 2Centro de Investigación Biomédica en Red (CIBER, Enfermedades Hepáticas y Digestivas, Instituto de Salud Carlos III, Madrid, Spain Abstract: Because of the high prevalence and associated-mortality of hepatocellular carcinoma (HCC, early diagnosis of the disease is vital for patient survival. In this regard, tumor size is one of the two main prognostic factors for surgical resection, which constitutes the only curative treatment for HCC along with liver transplantation. However, techniques for HCC surveillance and diagnosis that are currently used in clinical practice have certain limitations that may be inherent to the tumor development. Thus, it is important to continue efforts in the search for biomarkers that increase diagnostic accuracy for HCC. In this review, we focus on different biological sources of candidate biomarkers for HCC diagnosis. Although those biomarkers identified from biological samples obtained by noninvasive methods have greater diagnostic value, we have also considered those obtained from liver tissue because of their potential therapeutic value. To date, sorafenib is the only US Food and Drug Administration-approved antineoplastic for HCC. However, this therapeutic agent shows very low tumor response rates and frequently causes acquired resistance in HCC patients. We discuss the use of HCC biomarkers as therapeutic targets themselves, or as targets to increase sensitivity to sorafenib treatment. Keywords: diagnosis, sorafenib, therapy

  18. Adaptação e comportamento de pastejo da abelha jandaíra (Melipona subnitida Ducke em ambiente protegido - DOI: 10.4025/actascianimsci.v26i3.1777 Adaptation and foraging behavior of the stingless bee (Melipona subnitida Ducke in a caged environment - DOI: 10.4025/actascianimsci.v26i3.1777

    Directory of Open Access Journals (Sweden)

    Eva Mônica Sarmento da Silva

    2004-04-01

    Full Text Available A influência do ambiente protegido no comportamento de pastejo da abelha sem ferrão jandaíra (Melipona subnitida Ducke foi estudada no Estado do Ceará, região Nordeste do Brasil. Foram investigados aspectos como comportamento, adaptação das abelhas à casa de vegetação e o padrão diário de forrageamento destas na cultura do pimentão (Capsicum annuum L., cultivada em ambiente protegido. Os dados foram analisados estatisticamente por meio de análise de variância, com médias comparadas a posteriori, pelo teste de Tukey. Os resultados obtidos mostraram que M. subnitida Ducke adapta-se bem ao uso em casa de vegetação e realiza vôos de forrageamento durante todo o dia, podendo ser utilizada para polinização de culturas agrícolas, sob cultivo protegido.The effect of caged environment on the foraging behavior of the stingless bee Melipona subnitida Ducke was studied in the state of Ceará, NE Brazil. Species adaptation to enclosures, foraging behavioral aspects and daily foraging pattern were investigated in a greenhouse sweet pepper (Capsicum annuum L. crop. Data were analyzed by Anova and means were compared a posteriori using Tukey test. The results showed that M. subnitida Ducke adapts well to greenhouses and forages throughout the day. It may be concluded that this bee species can be used for crop pollination in protected environments.

  19. Desenvolvimento produtivo de colmeias de abelhas Melipona scutellaris

    Directory of Open Access Journals (Sweden)

    Adriana Evangelista Rodrigues

    2008-01-01

    Full Text Available http://dx.doi.org/10.5007/2175-7925.2008v21n1p59 A criação de espécies nativas de abelhas, também conhecidas como abelhas sem ferrão, têm despertado interesse geral na área, em função da facilidade de manejo e da qualidade dos produtos. No entanto, pouco se sabe sobre sua produção e sua biologia e por isto o presente trabalho acompanhou o desenvolvimento de colmeias de Melipona scutellaris, avaliando os seus parâmetros produtivos em ambiente de criação. Como o crescimento de uma colmeia tem como parâmetro o armazenamento de alimento, e como no caso da abelha M.scutellaris este armazenamento é feito em potes construídos com cera, foram feitas contagens dos potes nas colmeias classificando-os como: potes abertos, potes fechados e potes vazios, separando-os de acordo com o conteúdo (mel ou pólen. Foram medidas as suas dimensões e anotadas para posterior avaliação dos dados. Com os resultados pôde-se averiguar que as colmeias apresentam quantidades de potes diferentes, variando em função do número de indivíduos que colaboram para este fator. Confirmou-se que, quando o alimento é escasso no pasto apícola, as abelhas usam o alimento armazenado nos potes, em função da diminuição de matéria-prima na entressafra.

  20. Meliponini Neotropicais: o gênero Dolichotrigona Moure (Hymenoptera, Apidae, Apinae Neotropical Meliponini: the genus Dolichotrigona Moure (Hymenoptera, Apidae, Apinae

    Directory of Open Access Journals (Sweden)

    João M. F. Camargo

    2005-03-01

    Full Text Available O gênero neotropical de abelhas-sem-ferrão Dolichotrigona Moure, 1950, é revisado. Sete espécies novas são descritas: D. mendersoni sp. nov. (Brasil: AM, AC, RO, D. clavicornis sp. nov. (Brasil: AC, D. rondoni sp. nov. (Brasil: RO, D. tavaresi sp. nov. (Brasil: AM, AC, D. browni sp. nov. (Brasil: RO, AC, MT; Peru, Equador, Bolívia, D. moratoi sp. nov. (Brasil, AM, AC e D. chachapoya sp. nov. (Peru. O holótipo de Trigona martinezi Brèthes, 1920, e o lectótipo de Melipona longitarsis Ducke, 1916 - aqui designado -, foram examinados e redescritos. Trigona schulthessi Friese, 1900, foi interpretada com base na literatura. Chave para identificação das espécies e ilustrações dos principais caracteres diagnósticos são apresentadas.The Neotropical stingless bees genus Dolichotrigona Moure, 1950, is revised. Seven new species are described: D. mendersoni sp. nov. (Brazil: AM, AC, RO, D. clavicornis sp. nov. (Brazil: AC, D. rondoni sp. nov. (Brazil: RO, D. tavaresi sp. nov. (Brazil: AM, AC, D. browni sp. nov. (Brazil: RO, AC, MT; Peru, Equador, Bolivia, D. moratoi sp. nov. (Brazil, AM, AC and D. chachapoya sp. nov. (Peru. The holotype of Trigona martinezi Brèthes, 1920, and the lectotype of Melipona longitarsis Ducke, 1916 - herein designated -, were examined and redescribed. Trigona schulthessi Friese, 1900, was interpreted based on the literature. Identification key for species and illustrations of the main diagnostic characters are presented.

  1. A molecular marker distinguishes the subspecies Melipona quadrifasciata quadrifasciata and Melipona quadrifasciata anthidioides (Hymenoptera: Apidae, Meliponinae

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    Ana M. Waldschmidt

    2000-09-01

    Full Text Available The stingless bee species Melipona quadrifasciata includes two subspecies, Melipona quadrifasciata anthidioids and Melipona quadrifasciata quadrifasciata. The morphological difference between the two subspecies is the presence of three to five continuous yellow stripes on the terga on the 3rd to 6th segments in workers and males of M. q. quadrifasciata, and two to five interrupted bands in M. q. anthidioides. We identified a DNA marker which is present in M. q. quadrifasciata and absent in M. q. anthidioides. Only one among the M. q. quadrifasciata colonies did not present the marker. It was also absent in bees collected in northern Minas Gerais State (Brazil, despite their morphological resemblance to M. q. quadrifasciata. The marker can be used for studying the genetic structure of the hybridization zone formed by the intercrossing of the two subspecies.A espécie de abelha sem ferrão Melipona quadrifasciata apresenta duas subespécies, Melipona quadrifasciata quadrifasciata Lep. e Melipona quadrifasciata anthidioides Lep. A diferença morfológica entre as duas subespécies é a presença de três a cinco bandas tergais amarelas do 3º ao 6º segmentos em operárias e machos de M. q. quadrifasciata e duas a cinco bandas interrompidas em M. q. anthidioides. Nós identificamos um marcador de DNA que está presente em M. q. quadrifasciata e ausente em M. q. anthidioides. Este marcador está ausente em abelhas coletadas no norte do Estado de Minas Gerais (Brasil, embora esses indivíduos apresentem morfologia similar à de M. q. quadrifasciata. Este marcador poderá ser utilizado em estudos da zona de hibridação entre as subespécies.

  2. Teratoma do ovario com estruturas semelhando cristalino

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    C. Magarinos Torres

    1940-01-01

    Full Text Available Em uma mulher, brasileira, de côr parda, com 48 anos de idade, morta com tuberculose do peritoneo, tuberculose peribronquica do lóbo superior do pulmão esquerdo e tuberculose cronica fibrosa do apice de ambos os pulmões, a necropsía revelou a existencia de um teratoma no ovario esquerdo. O ovario, pouco aumentado de volume, é constituído por duas porções de tamanho sensivelmente egual, de consistencia firme, separadas, em sua superficie, por profundo sulco. Ao córte, tem a aparencia de tecido fibroso em cuja espessura existem numerosos pequenos cistos. Ao microscopio, os cistos são revestidos por epitelio descontinuo, despertando grande interesse o seu conteúdo. Este é formado por fibras e células com morfologia semelhante ás do cristalino. Sugerimos a possibilidade de que, no presente teratoma (Teratoma lentifer, de lens, lentis: cristalino, e ferre: produzir haja participado, de modo dominante, o ectodérme, e mesmo uma região circumscrita do ectodérme, a qual corresponderia aquela emque se desenvolve, habitualmente, a placa do cristalino (« Linsenplatte ». A multiplicidade e a presença exclusiva de estruturas figurando saculos cristalinicos (« Linsensäckchen » são argumentos a favor de uma origem de ponto restrito do ectodérme, destinado a desenvolvimento posterior especifico, qual o da formação do cristalino.

  3. The role of emotionality in the acquisition of new concrete and abstract words

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    Pilar eFerré

    2015-07-01

    Full Text Available A processing advantage for emotional words relative to neutral words has been widely demonstrated in the monolingual domain (e.g., Kuperman, Estes, Brysbaert, & Warriner, 2014. It is also well known that, in bilingual speakers who have a certain degree of proficiency in their second language, the effects of the affective content of words on cognition are not restricted to the native language (e.g., Ferré, García, Fraga, Sánchez-Casas, & Molero, 2010. The aim of the present study was to test whether this facilitative effect can also be obtained during the very early stages of word acquisition. In the context of a novel word learning paradigm, participants were trained on a set of Basque words by associating them to their Spanish translations. Words’ concreteness and affective valence were orthogonally manipulated. Immediately after the learning phase and one week later, participants were tested in a Basque go-no go lexical decision task as well as in a translation task in which they had to provide the Spanish translation of the Basque words. A similar pattern of results was found across tasks and sessions, revealing main effects of concreteness and emotional content as well as an interaction between both factors. Thus, the emotional content facilitated the acquisition of abstract, but not concrete words, in the new language, with a more reliable effect for negative words than for positive ones. The results are discussed in light of the embodied theoretical view of semantic representation proposed by Kousta,Vigliocco, Vinson, Andrews, and Del Campo (2011.

  4. Precession of a two-layer Earth: contributions of the core and elasticity

    Science.gov (United States)

    Baenas, Tomás; Ferrándiz, José M.; Escapa, Alberto; Getino, Juan; Navarro, Juan F.

    2016-04-01

    The Earth's internal structure contributes to the precession rate in a small but non-negligible amount, given the current accuracy goals demanded by IAG/GGOS to the reference frames, namely 30 μas and 3 μas/yr. These contributions come from a variety of sources. One of those not yet accounted for in current IAU models is associated to the crossed effects of certain nutation-rising terms of a two-layer Earth model; intuitively, it gathers an 'indirect' effect of the core via the NDFW, or FCN, resonance as well as a 'direct' effect arising from terms that account for energy variations depending on the elasticity of the core. Similar order of magnitude reaches the direct effect of the departure of the Earth's rheology from linear elasticity. To compute those effects we work out the problem in a unified way within the Hamiltonian framework developed by Getino and Ferrándiz (2001). It allows a consistent treatment of the problem since all the perturbations are derived from the same tide generating expansion and the crossing effects are rigorously obtained through Hori's canonical perturbation method. The problem admits an asymptotic analytical solution. The Hamiltonian is constructed by considering a two-layer Earth model made up of an anelastic mantle and a fluid core, perturbed by the gravitational action of the Moon and the Sun. The former effects reach some tens of μas/yr in the longitude rate, hence above the target accuracy level. We outline their influence in the estimation of the Earth's dynamical ellipticity, a main parameter factorizing both precession and nutation.

  5. StarNet: An application of deep learning in the analysis of stellar spectra

    Science.gov (United States)

    Kielty, Collin; Bialek, Spencer; Fabbro, Sebastien; Venn, Kim; O'Briain, Teaghan; Jahandar, Farbod; Monty, Stephanie

    2018-06-01

    In an era when spectroscopic surveys are capable of collecting spectra for hundreds of thousands of stars, fast and efficient analysis methods are required to maximize scientific impact. These surveys provide a homogeneous database of stellar spectra that are ideal for machine learning applications. In this poster, we present StarNet: a convolutional neural network model applied to the analysis of both SDSS-III APOGEE DR13 and synthetic stellar spectra. When trained on synthetic spectra alone, the calculated stellar parameters (temperature, surface gravity, and metallicity) are of excellent precision and accuracy for both APOGEE data and synthetic data, over a wide range of signal-to-noise ratios. While StarNet was developed using the APOGEE observed spectra and corresponding ASSeT synthetic grid, we suggest that this technique is applicable to other spectral resolutions, spectral surveys, and wavelength regimes. As a demonstration of this, we present a StarNet model trained on lower resolution, R=6000, IR synthetic spectra, describing the spectra delivered by Gemini/NIFS and the forthcoming Gemini/GIRMOS instrument (PI Sivanandam, UToronto). Preliminary results suggest that the stellar parameters determined from this low resolution StarNet model are comparable in precision to the high-resolution APOGEE results. The success of StarNet at lower resolution can be attributed to (1) a large training set of synthetic spectra (N ~200,000) with a priori stellar labels, and (2) the use of the entire spectrum in the solution rather than a few weighted windows, which are common methods in other spectral analysis tools (e.g. FERRE or The Cannon). Remaining challenges in our StarNet applications include rectification, continuum normalization, and wavelength coverage. Solutions to these problems could be used to guide decisions made in the development of future spectrographs, spectroscopic surveys, and data reduction pipelines, such as for the future MSE.

  6. Ahorro de energía en la clinkerización empleando CaF2 y CaS04 como mineralizadores. Estudio de la fluorellestadita

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    Vázquez, Tomás

    1981-03-01

    Full Text Available Not availableEl clínker portland está compuesto esencialmente por cuatro fases: alita, belita, fase alumínica y fase ferrítica, que se corresponden de forma aproximada con C3S, C2S, C3A y C4AF (*, respectivamente. Estas dos últimas ("fundentes" tienen como misión principal el facilitar la formación de los hidráulicamente activos, C3S y C2S. Es decir, su aportación a las resistencias mecánicas del cemento hidratado es prácticamente despreciable. Aquellas fases (C3A y C4AF se forman en el horno a partir de los crudos empleados (generalmente caliza y arcilla; su coste energético es elevado ya que además del que precisan para su síntesis les es necesaria una alta proporción de CaO. Este óxido proviene a su vez de la descarbonatación del CaC03, que es el proceso químico que mayor energía consume en la clinkerización. Por ello, una forma que a priori sería válida para ahorrar energía en la fabricación de cemento es la de sustituir total o parcialmente la "fase líquida" (C3A + C4AF tradicional por otra que no precisara tanto CaO, ni que se formara con tan elevado gasto de energía.

  7. Globular Clusters: Absolute Proper Motions and Galactic Orbits

    Science.gov (United States)

    Chemel, A. A.; Glushkova, E. V.; Dambis, A. K.; Rastorguev, A. S.; Yalyalieva, L. N.; Klinichev, A. D.

    2018-04-01

    We cross-match objects from several different astronomical catalogs to determine the absolute proper motions of stars within the 30-arcmin radius fields of 115 Milky-Way globular clusters with the accuracy of 1-2 mas yr-1. The proper motions are based on positional data recovered from the USNO-B1, 2MASS, URAT1, ALLWISE, UCAC5, and Gaia DR1 surveys with up to ten positions spanning an epoch difference of up to about 65 years, and reduced to Gaia DR1 TGAS frame using UCAC5 as the reference catalog. Cluster members are photometrically identified by selecting horizontal- and red-giant branch stars on color-magnitude diagrams, and the mean absolute proper motions of the clusters with a typical formal error of about 0.4 mas yr-1 are computed by averaging the proper motions of selected members. The inferred absolute proper motions of clusters are combined with available radial-velocity data and heliocentric distance estimates to compute the cluster orbits in terms of the Galactic potential models based on Miyamoto and Nagai disk, Hernquist spheroid, and modified isothermal dark-matter halo (axisymmetric model without a bar) and the same model + rotating Ferre's bar (non-axisymmetric). Five distant clusters have higher-than-escape velocities, most likely due to large errors of computed transversal velocities, whereas the computed orbits of all other clusters remain bound to the Galaxy. Unlike previously published results, we find the bar to affect substantially the orbits of most of the clusters, even those at large Galactocentric distances, bringing appreciable chaotization, especially in the portions of the orbits close to the Galactic center, and stretching out the orbits of some of the thick-disk clusters.

  8. Velocidad de crecimiento de grietas por corrosión bajo tensión en soldaduras disímiles

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    Fernández, María del Pilar

    2000-02-01

    Full Text Available Dissimilar welds, used to join different sections in light water reactors, are potentially susceptible to stress corrosion cracking (SCC in aqueous mediums characteristic of nuclear plants. However, the study of these welds has been limited to evaluating the weld material susceptibility in these mediums. Little scarce data are available on crack growth rates due, fundamentally, to inadequate testing techniques. In order to address this lack of information the crack growth rate at the interface of ferritic SA533B-1 alloy and alloy 1-82, in a dissimilar weld (SA533B-1/I-82/316L, was studied. Experiments were conducted in water at 288 °C, 8 ppm of O2 and 1 μS/cm conductivity.

    Las soldaduras disímiles, que son utilizadas para unir diferentes partes en los reactores de agua ligera, son potencialmente susceptibles de experimentar corrosión bajo tensión (SCC en los medios acuosos característicos de las plantas nucleares. Sin embargo, el estudio de estas soldaduras ha estado limitado a evaluar en dichos medios la susceptibilidad a SCC de los materiales que componen las mismas por separado, existiendo pocos datos de velocidad de crecimiento de grietas debido fundamentalmente a la falta de estandarización de este tipo de ensayos. En este trabajo se ha pretendido determinar la velocidad de crecimiento de grietas en la interfase formada por el acero ferrítico SA533B-1y la aleación I-82 dentro de la soldadura disímil compuesta por el acero SA533B-1/I-82/316L en unas condiciones de química del agua correspondientes a 8 ppm de O2, una conductividad de 1 μS/cm y a una temperatura de 288 °C.

  9. ABELHAS SEM FERRÃO: EDUCAÇÃO PARA CONSERVAÇÃO – INTERAÇÃO ENSINO-PESQUISA-EXTENSÃO VOLTADA PARA O ENSINO FUNDAMENTAL

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    Mara Garcia Tavares

    2016-08-01

    Full Text Available Resumo: O projeto de extensão universitária em interface com a pesquisa “Abelhas sem Ferrão: Educação para Conservação” foi elaborado a partir dos conhecimentos gerados com pesquisas com abelhas nativas, com a missão de enriquecer o processo pedagógico, socializar o saber e possibilitar meios para a interação com a comunidade. O presente artigo relata a experiência vivida por alunos de três escolas da rede pública de Viçosa (MG. As atividades desenvolvidas foram: trilhas para localização de ninhos de abelhas no campus da Universidade Federal de Viçosa (UFV e no entorno das escolas, visita ao Apiário Central da UFV, oficinas, palestras, minicurso e acompanhamento de duas colônias de abelhas sem ferrão instaladas nas escolas. Os alunos também apresentaram os resultados de suas atividades nas escolas e na Feira do Conhecimento de Viçosa. Após análise dos questionários avaliativos utilizados, verificou-se que o desconhecimento inicial dos participantes sobre as abelhas brasileiras deu lugar a um considerável volume de novas informações e interesses sobre o tema. Além dos alunos, as professoras de Ciências das escolas participaram ativamente das atividades e consideraram que, além de propiciar oportunidades de aprendizagem para os estudantes, o projeto enriqueceu seus conhecimentos e estreitou as relações entre a comunidade escolar e a UFV. O projeto constituiu, ainda, excelente oportunidade de formação para pós-graduandos e graduandos. Como base nas trocas de experiências que ocorreram, verificou-se que a utilização de atividades não formais de educação é muito importante para um ensino mais eficiente. Palavras-chave: Educação Ambiental, Ensino-Aprendizagem, Extensão Universitária, Modelo Biológico.  Education for conservation of stingless bees: an interaction of Education-Research-Extension for elementary and secondary education Abstract: The extension project interfaces with research initiative

  10. J0815+4729: A Chemically Primitive Dwarf Star in the Galactic Halo Observed with Gran Telescopio Canarias

    Science.gov (United States)

    Aguado, David S.; González Hernández, Jonay I.; Allende Prieto, Carlos; Rebolo, Rafael

    2018-01-01

    We report the discovery of the carbon-rich hyper metal-poor unevolved star J0815+4729. This dwarf star was selected from SDSS/BOSS as a metal-poor candidate and follow-up spectroscopic observations at medium resolution were obtained with the Intermediate dispersion Spectrograph and Imaging System (ISIS) at William Herschel Telescope and the Optical System for Imaging and low-intermediate-Resolution Integrated Spectroscopy (OSIRIS) at Gran Telescopio de Canarias. We use the FERRE code to derive the main stellar parameters, {T}{eff}=6215+/- 82 K, and {log}g=4.7+/- 0.5, an upper limit to the metallicity of [Fe/H] ≤ ‑5.8, and a carbon abundance of [C/Fe] ≥ +5.0, while [α /{Fe}]=0.4 is assumed. The metallicity upper limit is based on the Ca II K line, which at the resolving power of the OSIRIS spectrograph cannot be resolved from possible interstellar calcium. The star could be the most iron-poor unevolved star known and also be among the ones with the largest overabundances of carbon. High-resolution spectroscopy of J0815+4729 will certainly help to derive other important elemental abundances, possibly providing new fundamental constraints on the early stages of the universe, the formation of the first stars, and the properties of the first supernovae. Based on observations made with the Gran Telescopio Canarias (GTC), installed in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias, on the island of La Palma. Program ID GTC90-15B and the Discretionary Director Time GTC03-16ADDT and also based on observations made with the William Herschel Telescope (WHT).

  11. Use of the X-Ray diffraction technique in the assessment of air quality at Presidente Antônio Carlos Avenue, Belo Horizonte

    International Nuclear Information System (INIS)

    Cesar, Raisa Helena Sant’Ana; Barreto, Alberto Avelar; Cruz, Ananda Borjaille; Barbosa, João Batista Santos; Silva, Igor Felipe Moura

    2017-01-01

    Belo Horizonte is the sixth most populous city in Brazil, has the third largest fleet of vehicles and it is close to large mineralogical reserves, such the Quadrilátero Ferrífero. These factors, coupled with the industrial growth and civil construction, raise questions about society regarding ambient air quality. A historically problematic contaminant is the particulate matter (PM), a mixture of solid and liquid particles in suspension that generate environmental damage and human health. These particles can cause from a simple infection to death, being their dimension a fundamental factor to evaluate the impact caused. In this context, this research investigated the air quality due to PM10 (particles less than 10 microns) in a high traffic flow of Minas Gerais capital, Presidente Antônio Carlos Avenue. This avenue is one of the main accesses to the region of Pampulha, an area of great tourist and sporting relevance of the city and has undergone works of duplication and implementation of exclusive lanes for public transport buses due to the realization of the 2014 World Cup. Involved monitoring in the avenue in the year 2014 in order to collect the PM10 present in the ambient air. The characterization of PM10 occurred with the use of the X-ray diffraction technique, one of the main tools of mineralogical characterization, due to its simplicity, speed and reliability of the obtained results. The minerals detected by the analysis were evaluated for their possible origin, generating information for the evaluation of PM10 emitting sources that are fundamental for the management of air quality in the city. (author)

  12. [Natural evolution of excess body weight (overweight and obesity) in children].

    Science.gov (United States)

    Durá Travé, T; Gallinas Victoriano, F

    2013-11-01

    To analyze the chronological evolution of excess body weight (overweight and obesity) in order to raise public awareness within the different areas of intervention (family, school, business environment, health services) and to take effective actions. Weight, height and body mass index (BMI) of 604 healthy subjects (307 males and 297 females) have been recorded at birth and at the age of 1, 2, 3, 4, 6, 8, 10, 12 and 14 years. The excess body weight has been calculated according to national references from Ferrández et al. Prevalence of excess body weight at age 14 years was significantly higher (P<.05) in males (29%) than in females (12.8%). BMI (kg/m2) was significantly higher (P<.05) for both sexes in every age period, except for birth and age 1 year, in those patients with excess body weight at age 14, with respect to patients with normal nutritional status of the same age. Those groups with excess body weight at age 14 showed a BMI (Z-score) reaching overweight or obesity levels at age 4, and progressively increasing. Excess body weight probably starts at early stages in life, when dietary habits of the child depends almost exclusively on family habits, and may be aggravated during school attendance. Finally, a disproportionate weight increase occurs in adolescence that is probably related to unhealthy dietary habits and way of life. Copyright © 2013 Asociación Española de Pediatría. Published by Elsevier Espana. All rights reserved.

  13. Determinación de tensiones por rayos x del acero AISI 1045 deformado por rodillo // Determination of stress for x‐ray of the steel AISI 1045 deformed for roller

    Directory of Open Access Journals (Sweden)

    Tomás Fernández‐Columbié

    2012-01-01

    Full Text Available El objetivo del trabajo es realizar el análisis de las tensiones a muestras de acero AISI 1045 endurecidasen frío por rodillo. Con empleo del método de Willianson–Hall se determinó las macro ymicrodeformaciones; la deformación reticular del parámetro de red; el tamaño de las cristalitas; losesfuerzos en la red cristalina y la reducción del tamaño promedio de los granos, lo que permitió establecerlos mecanismos de endurecimiento del acero AISI 1045, deformado por rodadura. Fueron medidos yanalizados diferentes puntos teniendo en cuenta los índices de Miller para la fase ferrítica del acero. Losmodelos lineales obtenidos, son estadísticamente significativos, que muestran una tendencia creciente delas propiedades mecánicas y metalúrgicas, según se incrementan las variables independientes delproceso de experimentación.Palabras claves: rodillo, rodadura, deformación plástica.__________________________________________________________________AbstractThe objective of the paper is to carry out the analysis from the tensions to steel samples AISI 1045hardened cold for roller. With employment of the method of Willianson-Hall was determined the macro andmicro deformations; the reticular deformation of the net parameter; the size of the crystallites; the efforts inthe crystalline net and the reduction of the size average of the grains, what allowed to establish themechanisms of hardening of the steel AISI 1045, deformed by rolling. They were measured and analyzeddifferent points keeping in mind the indexes of Miller for the phase ferrite of the steel. The obtained linealmodels, they are statistically significant that they show a growing tendency of the mechanical estates andmetallurgical, as the independent variables of the experimentation process are increased.Key words: roller, rolling, plastic deformation.

  14. Annealing of a ferritic stainless steel 409 stabilized with titanium and zirconium additions

    Directory of Open Access Journals (Sweden)

    Zambrano, P.

    2011-02-01

    Full Text Available A ferritic stainless steel 409 stabilized with titanium and zirconium was subject to thermomechanical processing. It was heated at 1210 °C for one hour, followed by a 75 % hot reduction in three passes, this rolling schedule ended at 980 °C. Samples were cooled to 600 °C by water spraying followed by air-cooling. The alloy was pickled, and was reduced 80 % by cold rolling. The alloy was annealed at different temperatures for 105 s. Additional annealing treatments were carried out at temperatures of 800, 850 and 900 °C for different times. Mechanical testing and texture were made to corroborate the degree of annealing and formability. Mechanical properties and Texture analyses showed that the alloy annealed at 850 °C for 14 min was both completely recrystallized and a very good formability.

    Un acero inoxidable ferrítico 409 estabilizado con titanio y zirconio fue sujeto a procesos termomecánicos. El acero fue calentado a 1210 ºC durante una hora, seguido por un laminado en caliente del 75 % en tres pases, el proceso terminó a los 980 ºC. Las muestras fueron enfriadas hasta 600 ºC por agua atomizada seguido de enfriamiento al aire. La aleación fue decapada y laminada en frío un 80 %. Posteriormente de desarrollaron tratamientos térmicos de recocido a diferentes temperaturas por un tiempo de 105 s. Adicionalmente se desarrollaron tratamientos de recocido a temperaturas de 800, 850 y 900 ºC a diferentes tiempos. Pruebas mecánicas y textura fueron realizadas para corroborar el grado de recocido y su formalidad. El análisis de las propiedades mecánicas y la Textura mostraron que la aleación recocida a 850 ºC por 14 min (840 s fue completamente recristalizada obteniendo la mejor formabilidad.

  15. Les cartes des chemins de fer au Etats-Unis dans la deuxième moitié du 19ème siècle : quelques réflexions sur la représentation géographique et la géographie imaginaire

    Directory of Open Access Journals (Sweden)

    Mila DI NAPOLI-MARCHETTI

    2009-07-01

    Full Text Available Sous l’impulsion des voies ferrées se développa aux Etats-Unis, dans la seconde moitié du 19ème siècle, une activité cartographique sans précédent. La représentation d’une réalité géographique, sous couvert de procédés graphiques et techniques, ne révèlerait-elle pas un autre type de géographie ? La carte étant un outil de communication, les cartes des chemins de fer publiées à partir de 1853 aux Etats-Unis ne furent-elles pas un outil privilégié destiné à véhiculer de façon plus ou moins délibérée, sous couvert d’une représentation graphique matérialisée sous des formes diverses, un message à la fois d’information, de propagande ou de publicité à la gloire d’une réussite économique et politique ?In the second half of the 19th century, the United States transcontinental railroads stimulated an unprecedented cartographic activity. The representation of a geographical reality, hidden behind the mapping process, may lead to the disclosure of another and unexpected geography. Since any map is regarded as a tool of communication, the railroad maps, published in the United States since 1853, may be considered a privileged tool intended to convey a message of information, propaganda and advertising glorifying the economic and political success, hiding behind graphic representations featured in various forms.

  16. La competencia mediática en personas mayores. Propuesta de un instrumento de evaluación

    Directory of Open Access Journals (Sweden)

    Ramón Tirado Morueta

    2012-07-01

    Full Text Available 0 0 1 174 959 mod 7 2 1131 14.0 Normal 0 21 false false false ES JA X-NONE El artículo muestra el proceso de creación y validación, a través de prueba piloto, de un test para evaluar la competencia mediática de personas mayores de 60 años. Partiendo de la revisión de literatura sobre las diferentes concepciones de competencia mediática, y de la propuesta de Ferrés y Aguaded (2011 sobre el grado de competencia de la ciudadanía en España, así como de otros instrumentos semejantes utilizados en otros países de la Unión Europea, se propone utilizando la triangula de expertos, un test que trata de medir el nivel de competencia mediática de la ciudadanía de más de 60 años que participan en experiencias formativas universitarias. El método de validación es la aplicación de una prueba piloto a una muestra de 17 personas con 60 años o más, entre los cuales seis tienen estudios primarios, otros seis poseen estudios medios, y cinco estudios universitarios. Como resultado del estudio se propone un test, que en su aplicación a muestras mayores continuará en proceso de validación, en el que disminuye el número de ítems tratándose de adecuar a la realidad del colectivo indicado de personas mayores.

  17. Aspects of the ecology of phlebotomine sand flies (Diptera: Psychodidae) in the Private Natural Heritage Reserve Sanctuary Caraça.

    Science.gov (United States)

    Tonelli, Gabriel Barbosa; Tanure, Aline; Rêgo, Felipe Dutra; Carvalho, Gustavo Mayr de Lima; Simões, Taynãna César; Andrade Filho, José Dilermando

    2017-01-01

    Leishmaniases are a set of parasitic diseases of zoonotic origin that are transmitted by sandfly vectors in wild, rural and urban environments. Their distribution is dependent not only the distribution of vectors, but also on the distribution of mammalian reservoirs. Only by understanding the transmission cycle of these diseases, such as knowing the participating vectors and reservoirs, can one can understand the epidemiology and ecological relationships of leishmaniases. Ecotourism has become an important area of economic growth in Brazil. One of the most visited tourist attractions in the state of Minas Gerais, the Reserva Particular do Patrimônio Natural Santuário do Caraça (RPPNSC) is located in the Quadrilátero Ferrífero. The aim of this study was to contribute to the control of leishmaniasis among tourists of the RPPNPC by surveying its sand fly fauna and testing for the presence of Leishmania DNA in females. Twenty-five CDC light traps were exposed on 7 trails of the RPPNPC where samples were collected bimonthly for a year, starting in June 2013. A total of 376 specimens of 18 species and 10 genera of sandflies were captured. The predominant species were Psychodopygus lloydi (72.34%) and Pintomyia monticola (5.59%). HaeIII restriction enzyme detected and characterized Leishmania braziliensis DNA in 2 of the samples for an infection rate of 0.7% (2/266). Recent studies found specimens of Ps. lloyd infected with Leishmania braziliensis elsewhere in Minas Gerais, which may be an indication that this species is involved in the transmission of Leishmania in this state.

  18. Aspects of the ecology of phlebotomine sand flies (Diptera: Psychodidae in the Private Natural Heritage Reserve Sanctuary Caraça.

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    Gabriel Barbosa Tonelli

    Full Text Available Leishmaniases are a set of parasitic diseases of zoonotic origin that are transmitted by sandfly vectors in wild, rural and urban environments. Their distribution is dependent not only the distribution of vectors, but also on the distribution of mammalian reservoirs. Only by understanding the transmission cycle of these diseases, such as knowing the participating vectors and reservoirs, can one can understand the epidemiology and ecological relationships of leishmaniases. Ecotourism has become an important area of economic growth in Brazil. One of the most visited tourist attractions in the state of Minas Gerais, the Reserva Particular do Patrimônio Natural Santuário do Caraça (RPPNSC is located in the Quadrilátero Ferrífero. The aim of this study was to contribute to the control of leishmaniasis among tourists of the RPPNPC by surveying its sand fly fauna and testing for the presence of Leishmania DNA in females. Twenty-five CDC light traps were exposed on 7 trails of the RPPNPC where samples were collected bimonthly for a year, starting in June 2013. A total of 376 specimens of 18 species and 10 genera of sandflies were captured. The predominant species were Psychodopygus lloydi (72.34% and Pintomyia monticola (5.59%. HaeIII restriction enzyme detected and characterized Leishmania braziliensis DNA in 2 of the samples for an infection rate of 0.7% (2/266. Recent studies found specimens of Ps. lloyd infected with Leishmania braziliensis elsewhere in Minas Gerais, which may be an indication that this species is involved in the transmission of Leishmania in this state.

  19. QUANTIFICAÇÃO E ANÁLISE DA GEODIVERSIDADE APLICADA AO GEOTURISMO NA ÁREA DE PROTEÇÃO AMBIENTAL SUL DA REGIÃO METROPOLITANA DE BELO HORIZONTE, MINAS GERAIS

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    Eric Oliveira Pereira

    2016-08-01

    Full Text Available A geodiversidade, cujo significado do termo é análogo à biodiversidade, designa a diversidade natural da componente abiótica da natureza, composta pelos seguintes elementos: solo, rochas, formas de relevo, dentre outros. Apesar de recentes, os estudos em geodiversidade já apresentam uma discussão teórica bastante significativa. Contudo, a aplicação de métodos quantitativos, geralmente desenvolvidos com uso de Sistemas de Informação Geográficas (SIG ainda é incipiente, especialmente no Brasil. A Área de Proteção Ambiental Sul da Região Metropolitana de Belo Horizonte (APA Sul da RMBH, localizada no Quadrilátero Ferrífero (QF - Minas Gerais, possui um rico patrimônio natural, principalmente no que se refere aos elementos geológicos. Sua geodiversidade inclui afloramentos, solos, cachoeiras e diversas feições de relevo. Além disso, a área em questão apresenta grande importância para a Região Metropolitana de Belo Horizonte (RMBH, uma vez que nela estão localizados os principais mananciais de água potável para abastecimento da população. Deste modo, o principal objetivo deste trabalho é apresentar os procedimentos adotados para o cálculo e geração do mapa de geodiversidade à partir da utilização de um Sistema de Informação Geográfica, para a região da APA Sul da RMBH. Como resultado foi obtido o mapa de geodiversidade bem como a quantificação relativa das áreas de muito alta, alta, média e baixa diversidade abiótica que podem ser propostas futuramente como área prioritárias para a conservação.  O uso do SIG viabilizou o cálculo do índice de geodiversidade da APA Sul bem como a sua representação cartográfica.

  20. Obesity, knee osteoarthritis, and polypathology: factors favoring weight loss in older people

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    Isla Pera P

    2016-05-01

    Full Text Available Pilar Isla Pera,1 Ma Carmen Olivé Ferrér,1 Montserrat Nuñez Juarez,2 Esther Nuñez Juarez,3 Loreto Maciá Soler,4 Carmen López Matheu,1 Assumpta Rigol Cuadra,1 María Honrubia Pérez,1 Diana Marre5 1School of Nursing, University of Barcelona, 2Department of Rheumatology, Musculoskeletal Clínic Institute Hospital Clínic, 3Institut Català de la Salut, Barcelona, 4Nursing Department, University of Alicante, Alicante, 5Universitat Autònoma de Barcelona, Barcelona, Spain Aim: We aimed to explore the meaning of obesity in elderly persons with knee osteoarthritis (KO and to determine the factors that encourage or discourage weight loss.Background: Various studies have demonstrated that body mass index is related to KO and that weight loss improves symptoms and functional capacity. However, dietary habits are difficult to modify and most education programs are ineffective.Design: A phenomenological qualitative study was conducted. Intentional sampling was performed in ten older persons with KO who had lost weight and improved their health-related quality of life after participating in a health education program. A thematic content analysis was conducted following the stages proposed by Miles and Huberman.Findings: Participants understood obesity as a risk factor for health problems and stigma. They believed that the cause of obesity was multifactorial and criticized health professionals for labeling them as “obese” and for assigning a moral value to slimness and diet. The factors identified as contributing to the effectiveness of the program were a tolerant attitude among health professionals, group education that encouraged motivation, quantitative dietary recommendations, and a meaningful learning model based on social learning theories.Conclusion: Dietary self-management without prohibitions helped participants to make changes in the quantity and timing of some food intake and to lose weight without sacrificing some foods that were deeply

  1. Un paysage de l’industrie : canaux et usines en Val de Germigny (Cher

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    Patrick Léon

    2012-04-01

    Full Text Available Le canal de Berry et le canal latéral à la Loire, qui se rejoignent au port de Marseille-lès-Aubigny, ont été ouverts à la fin des années 1830. Ils constituent un maillon essentiel du réseau de canaux dans la France centrale. Le canal de Berry, voulu par les sidérurgistes berrichons pour approvisionner les forges en charbon, a rapidement joué un rôle déterminant dans l’implantation de nouvelles usines entre le milieu du XIXe siècle et les années 1920, surtout les tuileries-briqueteries et celles produisant de la chaux hydraulique et du ciment naturel. Pour les mêmes raisons, ces dernières ont aussi choisi les bords du canal latéral à la Loire qui a été initialement conçu pour pallier les insuffisances de la navigation sur le fleuve. Les canaux seront d’abord considérés comme des ouvrages hydrauliques, architecturaux et techniques mais on verra aussi le trafic et le fret qui les animent. Ils sont enfin les serviteurs des grandes usines qui en dépendent étroitement pour leur approvisionnement et l’écoulement de leur production. Par conséquent, un paysage particulier s’est constitué, caractérisé par le lien organique entre canal et usines selon une géographie linéaire : formes de la proximité de l’établissement industriel par rapport à la voie d’eau artificielle, embranchements particuliers (canaux, voies ferrées et ponts, ports.The Berry canal and the lateral canal running alongside the Loire, which meet up at the port of Marseille-lès-Aubigny, were cut at the end of the 1830s. They are an essential part of the network of canals in central France. The Berry canal, originally created for the iron and steel producers of the Berry region in order to facilitate coal supplies to their ironworks, became a vital influence in the implantation of new factories, from the middle of the nineteenth century up to the 1920s. Of particular importance were the brick and tile works, and other factories producing

  2. Reciclagem de Cavacos de Titânio para a Deposição de Revestimentos Duros por Soldagem

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    José Gedael Fagundes Júnior

    2015-03-01

    Full Text Available O titânio é um metal nobre e possui excelentes propriedades biomecânicas, podendo assim ser plenamente aceito pelo organismo humano. A grande demanda na utilização de implantes dentários, fabricados a partir de ligas de titânio traz consigo um aumento significativo na geração de resíduos (cavacos, resultantes dos processos de usinagem empregados. Com o objetivo de reduzir os impactos ambientais, soluções alternativas para a reutilização de tais resíduos têm sido estudadas. O carboneto de titânio (TiC possui elevada dureza, o que potencialmente permitiria a sua utilização como reforço em revestimentos antidesgaste aplicados em equipamentos das indústrias sucroalcooleira e mineradoras. Neste trabalho cavacos de ligas a base de titânio foram processados e utilizados como matéria prima para a fabricação de consumíveis experimentais de soldagem. Cordões de solda foram produzidos sobre amostras de aço-carbono por soldagem a arco elétrico com proteção gasosa e eletrodo de tungstênio (tradução do termo inglês GTAW. A caracterização microestrutural do metal de solda foi realizada por MEV e difração de raios-X. O comportamento mecânico dos revestimentos foi analisado por meio de um ultramicrodurômetro digital. Verificou-se que a microestrutura do metal de solda era composta por partículas não prismáticas de alta dureza distribuídas em uma matriz ferrítica. Medidas feitas por microanálise EDS mostraram diferenças na concentração de titânio entre a matriz e as partículas duras, onde maiores teores deste elemento foram identificados. A análise cristalográfica confirmou que houve a formação de carbonetos de titânio envoltos por uma matriz de ferrita.

  3. Laboratory experiments on solute transport in bimodal porous media under cyclic precipitation-evaporation boundary conditions

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    Cremer, Clemens; Neuweiler, Insa

    2016-04-01

    significantly influenced solute leaching. Dynamic boundary conditions generally resulted in faster initial breakthrough and stronger tailing. References: Bechtold, M., S. Haber-Pohlmeier, J. Vanderborght, A. Pohlmeier, T.P.A. Ferré and H. Veerecken. 2011a. Near-surface solute redistribution during evaporation. Geophys. Res. Lett., 38, L17404, doi:10.1029/2011GL048147. Lehmann, P. and D. Or. 2009. Evaporation and capillary coupling across vertical textural contrasts in porous media. Phys. Rev. E, 80, 046318, doi:10.1103/PhysRevE.80.046318.

  4. Cinética de engrosamiento de precipitados coherentes en la aleación Fe-10 % Ni-15 % Al

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    Cayetano-Castro, N.

    2008-04-01

    Full Text Available The coarsening kinetics and the morphology evolution of the coherent β’ (Fe, NiAl precipitates embedded in a ferritic matrix were studied in the aged Fe-10 % Ni-15 % Al alloy. Samples were solution treated at 1,100°C for 24 h and subsequently aged at 750, 850 and 920 °C for different times. XRD, SEM and TEM results showed the following decomposition reaction after aging treatment, αsss → α + β. Intragranular particles distribution changes from a random to an aligned on the elastically soft <100> crystallographic directions of the matrix. Additionally, the morphological evolution of the precipitates was as follows: spheres → cuboids → parallelepipeds → plates. The variation of the cube of mean radius of particles, r3, and the particle density as a function of time followed a linear relationship, as predicted by the Lifshitz, Slyosov and Wagner (LSW theory for diffusion-controlled coarsening. The rate constant (K increased with the aging temperature. The activation energy for coarsening process was determined to be about of 220 kJ/mol.

    La cinética de engrosamiento y la evolución morfológica de precipitados coherentes β’ (Fe, NiAl en una matriz ferrítica se estudió en la aleación Fe-10 % Ni-15 % Al. Se solubilizaron muestras a 1.100 °C por 24, y posteriormente, se envejecieron a 750, 850 y 920 °C por diferentes tiempos. Los resultados de DRX, MEB y MET mostraron la descomposición, αsss → α + β, durante su envejecido. La distribución de precipitados dentro del grano cambia, gradualmente, de aleatoria a un alineamiento preferencial sobre las direcciones cristalográficas <100> de la matriz. Asimismo, la evolución morfológica de los precipitados fue: esféricos → cúbicos → paralelepípedos → placas. La variación del tamaño de partícula, r3, y la densidad de precipitados en función del tiempo se comportan linealmente, como lo predice la teoría de Lifshitz

  5. Paleocene orthophragminids from the Lakadong Limestone, Mawmluh Quarry section, Meghalaya (Shillong, NE India): implications for the regional geology and paleobiogeography

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    Özcan, Ercan; Pignatti, Johannes; Pereira, Christer; Osman Yücel, Ali; Drobne, Katica; Barattolo, Filippo; Saraswati, Pratul Kumar

    2018-04-01

    The late Paleocene orthophragminids, hitherto poorly known from the Himalayan foreland basins, are studied from the Lakadong Limestone in Meghalaya, northeastern India, in order to establish a systematic, biostratigraphic, and paleobiogeographical framework for them in the eastern Tethys. In the Mawmluh Quarry section (MQS) on the Shillong Plateau, to the southeast of Tibet, orthophragminids are associated with typical Paleocene orbitoidiform taxa endemic to the Indian subcontinent, i.e., Lakadongia Matsumaru & Jauhri ( = Setia Ferràndez-Cañadell) and Orbitosiphon Rao, and various species of alveolinids, miscellaneids, and rotaliids, characterizing the Shallow Benthic Zones (SBZ) 3 and 4. The orthophragminids belong to two lineages of the genus Orbitoclypeus Silvestri: O. schopeni (Checchia-Rispoli) and O. multiplicatus (Gümbel), both well known from the peri-Mediterranean region and Europe (western Tethys). The latter species is identified here for the first time from the eastern Tethys. Previous records of the genus Discocyclina Gümbel from the Lakadong Limestone actually correspond to misidentified Orbitoclypeus; this implies that the late Paleocene orthophragminid assemblages from Meghalaya and eastern Tethys were less diverse than in the western Tethys. The lineage of Orbitoclypeus schopeni in the lower part of the Lakadong Limestone (SBZ 3) is identified as O. schopeni cf. ramaraoi based on the morphometry of a few specimens, whereas in the upper part (SBZ 4) it corresponds to a transitional development stage between O. schopeni ramaraoi and O. schopeni neumannae (with average Dmean values ranging between 192 and 199 µm). The embryon diameters of O. multiplicatus, recorded only in SBZ 4, range between 300 and 319 µm on average, corresponding to transitional development stages of O. multiplicatus haymanaensis and O. multiplicatus multiplicatus. Our data, along with a review of previous Paleocene and Eocene records from India and Pakistan, suggest that

  6. Mineralogia de solos com excesso de sódio no estado do Ceará

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    F. O. B. Mota

    1999-12-01

    Full Text Available Foram estudados dois perfis de solos com problemas de sodicidade (Planossolo Solódico e Solonetz-Solodizado, no estado do Ceará, com o objetivo de conhecer a mineralogia das frações areia, silte e argila e os processos de alterações que ocorrem nos respectivos minerais. A areia e o silte grosso foram avaliados por microscopia de polarização e contraste de fase, enquanto o silte fino e a argila foram analisados por difração de raios-X. Utilizou-se, ainda, a microscopia eletrônica de varredura para obtenção de informações complementares sobre as transformações mineralógicas ocorridas nos horizontes dos dois perfis. Verificou-se que o Planossolo Solódico apresenta na fração argila quantidades mais ou menos equivalentes de caulinita e montmorilonita no horizonte 2Btn, o mesmo acontecendo com as proporções de caulinita e vermiculita no horizonte A. Nas outras frações, foram encontrados teores variáveis de quartzo, plagioclásios, hornblenda e biotita. Por sua vez, o Solonetz-Solodizado mostrou uma fração argila essencialmente caulinítica ao longo de todo o perfil e com quantidades variáveis de quartzo, feldspato e biotita nas outras frações. Em ambos os perfis, o enriquecimento de argila no Bt resultou essencialmente das alterações "In situ" dos minerais primários intemperizáveis contidos na rocha subjacente. A hipótese de alternância de processos de oxi-redução nos horizontes A e, ou, E, em razão da baixa permeabilidade do horizonte 2Btn, provocando um processo de ferrólise naqueles horizontes, é também uma alternativa de gênese que não pode ser descartada para explicar o alto contraste textural desses solos. O intemperismo da albita e de outros plagioclásios ricos em sódio, o clima semi-árido, e a drenagem impedida são os fatores condicionantes dos percentuais elevados de sódio, observados nos dois pedons. Também nos dois solos, os teores destoantes de quartzo, a geomorfologia da região e a

  7. Substituição natural de rainhas fisogástricas e distância de vôo dos machos em Tiuba (Melipona compressipes fasciculata Smith, 1854 e Uruçu (Melipona scutellaris Latreille, 1811 (Apidae, Meliponini Natural substitutions of queens and flight distance of males in tiuba (Melipona compressipes fasciculata Smith, 1854 and uruçu (Melipona scutellaris Latreille, 1811 (Apidae, Meliponini

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    Gislene Almeida Carvalho-Zilse

    2004-12-01

    Full Text Available Este trabalho relata detalhes da vida reprodutiva de duas espécies de abelhas sem ferrão. Rainhas velhas de Melipona compressipes fasciculata, no Maranhão, morrem e são substituídas com sucesso em todos os meses. Rainhas de Melipona scutellaris, trazidas de Lençóis (BA - nordeste do Brasil para Uberlândia (MG, centro-sudeste do Brasil morreram durante todos os meses e não mostraram a existência de trimestre preferencial para as novas rainhas iniciarem postura. Quarenta machos de M. scutellaris, após serem marcados no tórax e libertados em grupos de 10 a 100, 400, 800 e 1000 metros do meliponário, tiveram seus retornos observados. Todos os machos libertados a 100 e 400 metros regressaram ao meliponário, 7 de 10 machos e 2 de 10 machos retornaram de 800 e 1000 metros, respectivamente. Os machos esperam constantemente pela saída de uma rainha virgem, próximos às colônias órfãs, o que indica que a maioria das rainhas é inseminada próximo aos seus ninhos, portanto, a dispersão dos genes depende do vôo dos machos e da distância de enxameagem para ocupação de uma cavidade para o novo ninho.This work reports on the reproductive life of the stingless bees (Meliponini. Old queens of Melipona compressipes fasciculata in Maranhão State, Brazil die and are successfully substituted by new ones in all months. Queens of Melipona scutellaris from Lençois (BA - northeastern Brazil brought to Uberlândia (Central South eastern Brazil died during all months, and there are no months where new queens are more able to begin egg laying. Forty males of M. scutellaris were marked in the thorax and released in groups of 10 at 100, 400, 800 and 1000 meters from the meliponary and their return to it was observed. All males released at 100 to 400 meters returned, 7 out of 10 and 2 out of 10 males returned respectively from 800 and 1000 meters. Males are constantly waiting for a virgin queen next to orphan colonies, the majority of the queens is

  8. Avaliação farmacognóstica de geoprópolis de Melipona fasciculata Smith da Baixada maranhense, Brasil

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    Richard Pereira Dutra

    Full Text Available Melipona fasciculata Smith é uma abelha nativa, social e sem ferrão que produz cera, mel e geoprópolis. O presente trabalho objetivou caracterizar, do ponto de vista farmacognóstico, o geoprópolis de Melipona fasciculata, coletado em meliponários nos municípios de Arari, São Bento e São João Batista, da Baixada maranhense, no Estado do Maranhão, visando estabelecer dados para o controle de qualidade e padronização do produto. A metodologia utilizada constou de análises sensoriais, abordagem química, perfis cromatográficos e determinação dos teores de flavonóides. Os resultados demonstram que o geoprópolis apresenta características sensoriais similares às encontradas para própolis de Apis mellifera, presença de compostos fenólicos em maior concentração, além de substâncias da classe dos terpenos e saponinas e ausência de alcalóides. Os perfis cromatográficos indicaram que a composição e concentração das substâncias químicas são diferentes entre as amostras. Os teores de flavonóides variaram de 0,17 - 2,6%, os quais para a maioria das amostras apresentaram valores acima do mínimo exigido pela legislação brasileira para própolis de Apis mellifera. Os dados encontrados sugerem que as variações qualitativa e quantitativa de flavonóides e outros constituintes químicos no geoprópolis são fortemente afetados pela flora visitada pelas abelhas, região geográfica e fatores ambientais.

  9. Flowstones from SE Spain document a close relationship between North Atlantic temperature and precipitation in the Western Mediterranean between 7 and 112 ka

    Science.gov (United States)

    Budsky, Alexander; Scholz, Denis; Mertz-Kraus, Regina; Spötl, Christoph; Gibert, Luis; Jochum, Klaus Peter

    2017-04-01

    Here we present three flowstone records from Cueva Victoria, SE Spain, covering the period between Marine Isotope Stage (MIS) 5 and MIS 3, the Late Glacial and the Holocene. The flowstones were precisely dated by the MC-ICPMS 230Th/U-method. In addition, stable oxygen and carbon isotope ratios as well as trace element concentrations were determined at high resolution (centennial to decadal scale). Present-day climate of SE Spain is classified as semi-arid with dry summer months (Iberian margin. δ18O values are around -3.5 ‰ and decrease to -5 to -6 ‰ during D/O events, while δ13C values are around -9 ‰ and decrease to -10 to -11 ‰ ) during D/O events. We interpret these changes as more humid conditions during D/O events, with elevated sea-surface temperatures in the North Atlantic and the Mediterranean Sea leading to increased moisture transport and precipitation on the SE Iberian Peninsula. As a consequence, vegetation density increased, which is reflected by the decrease in δ13C values and Mg and Sr concentrations and an increase in P content. In the Holocene, the flowstone grew continuously from the Bølling/Allerød to the mid-Holocene (7 ka). Stable isotopes record a trend of increasing temperatures with decreasing values towards the mid-Holocene (δ18O ≈ - 6.4 ‰ , δ13C ≈ -11 ‰ ). However, δ13C values record a significant excursion with elevated values (up to -3.8 ‰ ) during a period from 9.5 to 7.7 ka related to cold Bond-events in the North Atlantic, which is interpreted as a dry period in SE Spain. Budsky, A., Scholz, D., Gibert, L., Mertz-Kraus, R., 2015. 230Th/U-dating of the Cueva Victoria flowstone sequence: Preliminary results and paleoclimate implications, in: Gibert, L., Ferràndez-Canadell, C. (Eds.), Geology and Paleontology of Cueva Victoria. Mastia 11-13, Cartagena, pp. 101-109.

  10. Produção de cultivares de morangueiro polinizadas pela abelha jataí em ambiente protegido Yield of strawberry cultivars polinized by jatai bees under protected environment

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    Odirce Teixeira Antunes

    2007-03-01

    Full Text Available A cultura do morangueiro, tradicionalmente produzida a campo, teve seu sistema de cultivo modificado, sendo hoje produzido também em ambientes protegidos. Essa tecnologia pode, porém, ocasionar a produção de frutos deformados, devido à polinização entomófila insuficiente. O objetivo deste trabalho foi avaliar a produtividade dos frutos de morangueiro em ambiente protegido, utilizando a abelha jataí como agente polinizador. Foram avaliadas quatro cultivares de morangueiro (Oso Grande, Tudla, Chandler e Dover, na ausência e presença de duas e quatro colméias da Tetragonisca angustula (abelha sem ferrão Jataí. Os tratamentos constituíram um fatorial 4 x 3, dispostos em um delineamento completamente casualizado, com sete repetições e 6 plantas úteis por parcela. Os rendimentos obtidos nas cvs. Oso Grande, Tudla e Chandler demonstram que a presença da abelha jataí na polinização em ambiente protegido contribui para o aumento da produtividade. A cv. Dover é a que se mostrou menos dependente de agentes polinizadores. A presença de abelhas eleva a porcentagem de frutos comerciáveis. A recomendação é da utilização de quatro colméias de Tetragonisca angustula para cada 170 m² de área protegida.Strawberry, which used to be typically grown in field conditions, had the growth system changed to be produced under protected environment. However, the harvested fruits in this system may show a certain deformation due to the insects pollination's deficit. In this work the strawberry yield was evaluated under protected cultivation, using stinglees bees (Meliponinae Jatai as a pollination agent. Four strawberry cultivars (Oso Grande, Tudla, Chandler, and Dover were evaluated in the presence of Tetragonisca angustula L. (Jatai bee, using two, four, and no beehives. A completely randomized design in a 4 x 3 factorial scheme with seven replications and six plants per plot was used. The yield of Oso Grande, Tudla, and Chandler cultivars

  11. Constituent phases and mechanical properties of iron oxide-additioned phosphoaluminate cement

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    Yang, Shuai

    2015-06-01

    Full Text Available Iron oxide was added to phosphoaluminate clinker and its effects on cement constituents were determined using XRD, DSC, SEM-EDS and conduction calorimetry analysis. The variations in compressive strength were also studied. The results showed that in moderate amounts, iron oxide acts as a mineraliser during clinker sintering, furthering the conversion of CA1-Y(PY to LHss at a lower temperature than normally required for that reaction. The main constituents of iron oxide-rich phosphoaluminate clinker included LHss, CA1-Y(PY, CP1-Z(AZ and ferrite. The EDS findings showed that the composition of the ferrite phase was nonuniform. The conclusion drawn was that by modifying the dose of Fe2O3 , the composition of phosphoaluminate cement can be controlled to produce clinker and cement compliant with different mechanical strength requirements. The conduction calorimetry findings were consistent with those results.Este trabajo estudia, mediante DRX DSC, SEM-EDS y calorimetría de conducción, el efecto de la adición de óxido de hierro a un clinker de fosfoaluminato, así como las variaciones sufridas en su resistencia a compresión. Los resultados mostraron que en cantidades moderadas, el óxido de hierro actúa como mineralizador durante la sinterización del clinker, promoviendo la conversión de CA1-Y(PY a LHss a una temperatura más baja de la normalmente requerida. Los componentes principales del clínker de fosfoaluminato con óxido de hierrop son LHss, CA1-Y(PY, CP1-Z(AZ y fase ferritica. Los resultados de EDS mostraron que la composición de esta fase ferrítica no era uniforme. DE este estudio se ha podido concluir que variando la dosificación del Fe2O3 , se puede controlar la composición del fosfoaluminato para producir clinker y cemento compatibles con diferentes requisitos de resistencia mecánica. Los resultados de calorimetría de conducción fueron consistentes con los resultados.

  12. Comportamiento a fatiga de uniones a tope en chapas recubiertas soldadas por proceso láser

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    Amo, J. M.

    1998-05-01

    Full Text Available The fatigue strength and the fracture mechanism studies of butt laser welded joints in A155-Zn coated steel sheets, 0.62 and 1.16 mm thick, have been continued. The 2 x 106 cycles fatigue strength for both thicknesses has been finally established in 130 and 175 MPa, respectively, and the big ferritic grain - 300 μm - produced by symmetrical solidification from the fusion zone centre has been confirmed. Initiation and extension fracture zones are analysed by SEM and so are the involved microstructures. The first ones are concerned with high stress concentration zones, mainly undercuts or lack of penetration, from which the fatigue cracks extend in semiellipses, longitudinally and through thickness, along the fusion line or the HAZ. The final fracture is produced by tearing of the residual fatigue crack bound and crack deviation towards the central gross grain line of the welds.

    Se continúan los estudios de la resistencia a la fatiga y los mecanismos de rotura en uniones soldadas a tope por proceso láser, de chapas de acero con recubrimiento A155-Zn, en espesores de 0,62 y 1,16 mm. Las resistencias a fatiga a 2 x 106 ciclos para ambos espesores, se establecen finalmente en 130 y 175 MPa, respectivamente, y se confirma el gran tamaño de grano ferrítico - 300 μm - producido por solidificación simétrica desde el centro de la soldadura. Se analizan las zonas de iniciación y propagación de las roturas y las microestructuras implicadas con MEB. Las primeras se corresponden con zonas de concentración de tensión elevada, fundamentalmente mordeduras o faltas de penetración, a partir de las cuales las grietas de fatiga progresan en semielipses, longitudinalmente y en sentido del espesor, por línea de fusión o ZAT. La rotura final se produce por desgarramiento del ligamento residual de la grieta de fatiga y desvío hacia la línea central de grano grueso de las soldaduras.

  13. Os Processos Erosivos Lineares da Bacia Hidrográfica do Ribeirão Carioca, Itabirito/MG e seus Condicionantes Principais: observações preliminares

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    Marcus Mergajeto Netto

    2006-12-01

    Full Text Available Na bacia hidrográfica do ribeirão Carioca, no distrito de São Gonçalo do Bação, Itabirito (MG, porção central do Quadrilátero Ferrífero, observa-se grande concentração de formas erosivas - ravinas e voçorocas - que alcançam dezenas de metros de profundidade e comprimento, responsáveis por problemas como o abandono do lugar, a deficiência da agricultura, perdas de terras e assoreamento de cursos d'água, provocando prejuízos econômicos, sociais e ambientais, para o poder público e a população em geral. Pretende-se, com o estudo, conhecer a disposição espacial de tais formas, bem como suas principais características, através da análise das características geomorfológicas da área com o intuito de compreender as ocorrências erosivas e contribuir para a indentificação das fragilidades dos ambientes naturais da região. O trabalho resultou em um levantamento das feições erosivas existentes, distribuídas por toda área da bacia, segundo a compartimentação geológico-geomorfopedológica e distribuição altimétrica. O arranjo desses processos erosivos na região fornecem o cenário de uma paisagem degradada, além do risco instalado. Além disso, a contínua ação antrópica sobre o ambiente, desde três séculos torna evidente a necessidade de ações visando sua preservação e eventualmente sua recuperação.

  14. Avaliação microbiológica de amostras de mel de trigoníneos (Apidae: Trigonini do Estado da Bahia Microbiological evaluation of trigonine bee (Apidae: Trigonini honey samples from the State of Bahia - Brazil

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    Bruno de Almeida Souza

    2009-12-01

    Full Text Available O mel é um produto que apresenta atividade antimicrobiana atribuída a fatores físicos e químicos. Mesmo assim, ainda é possível encontrar uma série de microrganismos presentes neste produto e que servem como indicadores de qualidade. O objetivo deste trabalho foi avaliar a qualidade microbiológica do mel produzido por espécies de abelhas sem ferrão (Trigonini do Estado da Bahia. Quatorze amostras de mel foram avaliadas quanto ao teor de umidade, atividade de água, contagem padrão de bolores e leveduras, e presença de microrganismos do grupo coliforme. Um total de 50,0% das amostras apresentou contagem padrão para bolores e leveduras acima do máximo permitido pela regulamentação brasileira para alimentos. Esta desclassificação de amostras assepticamente colhidas indica a necessidade de identificação desta microbiota e sua possível ocorrência natural no mel produzido por este grupo de abelhas. Nenhuma das amostras foi desclassificada em relação à contagem de microrganismos do grupo coliforme.Honey is a product that presents antimicrobial activity attributed to physical and chemical factors. Even so, it is still possible to find many microorganisms present in this product, which can be used as quality indicators. The objective of this work was to evaluate the microbiologic quality of the honey produced by stingless bee species from the State of Bahia, Brazil. Fourteen samples of honey were evaluated for the moisture content, water activity, standard counting of moulds and yeasts, and presence of microorganisms of coliform group. A total of 50.0% of the samples presented standard counting of moulds and yeasts above the maximum value permmited by the Brazilian food legislation. This disqualification of samples asseptically harvested indicates the need of identification of this microbiota and its possible natural occurrence in the honey produced by this group of bees. None of the samples was disqualified regarding the

  15. Honey physicochemical properties of three species of the brazilian Melipona

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    Lorena G.A. Lage

    2012-09-01

    entre o mel de Melipona e o de Apis reforçam a necessidade de estabelecimento de padrões de qualidade específicos para o mel de abelhas sem ferrão.

  16. Increasing Interest of Mass Communication Media and the General Public in the Distribution of Tweets About Mental Disorders: Observational Study.

    Science.gov (United States)

    Alvarez-Mon, Miguel Angel; Asunsolo Del Barco, Angel; Lahera, Guillermo; Quintero, Javier; Ferre, Francisco; Pereira-Sanchez, Victor; Ortuño, Felipe; Alvarez-Mon, Melchor

    2018-05-28

    interest for psychiatric diseases on Twitter. The heterogeneous weights given by the media outlets analyzed to the different mental health disorders and conditions are reflected in the responses of Twitter followers. ©Miguel Angel Alvarez-Mon, Angel Asunsolo del Barco, Guillermo Lahera, Javier Quintero, Francisco Ferre, Victor Pereira-Sanchez, Felipe Ortuño, Melchor Alvarez-Mon. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 28.05.2018.

  17. The Second Victim Phenomenon After a Clinical Error: The Design and Evaluation of a Website to Reduce Caregivers' Emotional Responses After a Clinical Error.

    Science.gov (United States)

    Mira, José Joaquín; Carrillo, Irene; Guilabert, Mercedes; Lorenzo, Susana; Pérez-Pérez, Pastora; Silvestre, Carmen; Ferrús, Lena

    2017-06-08

    event (P<.001). The MISE program differs from existing intervention initiatives by its preventive nature in relation to the second victim phenomenon. Its online nature makes it an easily accessible tool for the professional community. This program has shown to increase user's knowledge on this issue and it helps them correct their approach. Furthermore, it is one of the first initiatives to attempt to bring the second victim phenomenon closer to primary care. ©José Joaquín Mira, Irene Carrillo, Mercedes Guilabert, Susana Lorenzo, Pastora Pérez-Pérez, Carmen Silvestre, Lena Ferrús, Spanish Second Victim Research Team. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 08.06.2017.

  18. Diversity and Efficiency of Rhizobia Communities from Iron Mining Areas Using Cowpea as a Trap Plant

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    Jordana Luísa de Castro

    2017-08-01

    Full Text Available ABSTRACT Mining is an important economic activity. However, its impact on environment must be accessed, mainly on relevant processes for their sustainability. The objective of this study was to evaluate the diversity and efficiency of symbiotic nitrogen fixing bacterial communities in soils under different types of vegetation in the Quadrilátero Ferrífero: ironstone outcrops, Atlantic Forest, neotropical savanna, and a rehabilitated area revegetated with grass. Suspensions of soil samples collected under each type of vegetation were made in a saline solution to capture rhizobia communities that were then inoculated on cowpea [Vigna unguiculata (L. Walp.], which was used as a trap plant. The symbiotic efficiency of the communities was evaluated in a greenhouse experiment and the data obtained were correlated to the chemical and physical properties of the soils under each type of vegetation. At the end of the experiment, the bacteria present in the nodules were isolated to evaluate their diversity. The highest numbers of nodules occurred in the treatment inoculated with soil samples from rehabilitated area revegetated with grass and neotropical savanna vegetation, and the lowest numbers were observed in the treatment inoculated with soil samples from ironstone outcrops and Atlantic Forest. In relation to root dry matter, the treatment inoculated with soil samples from Neotropical savanah was superior to those inoculated with soil samples from the other areas; already, in relation to the shoot dry matter, no significant difference among the treatments was observed. The soil properties with the greatest influence on the microbial communities were Al3+ content, considered as high in the Atlantic Forest and neotropical savanna vegetation, as intermediate in the iron outcrops, and as very low in the rehabilitated area revegetated with grass; organic matter, considered as very high in the ironstone outcrops and neotropical savanna, as high in the

  19. Microfacies analysis of foraminifera rich sedimentary rocks from the Desert Plateau, central Egypt.

    Science.gov (United States)

    Karnitschar, C.; Briguglio, A.; Hohenegger, J.

    2012-04-01

    area and to the fauna observed in the sections, the source of the samples can be related to the Farafra Formation, which is characterized by white to grey alveolinid shallow water limestone. The closest outcrop belonging to this formation can be found around 50 kilometers westwards from the location where the samples were taken. Serra-Kiel J., Hottinger L., Caus E., Drobne K., Ferrà Ndez C., Jauhria.K., Less G., Pavlovec R., Pignatti J., Samsó J.M., Schaub H., Sirel E., Strougo A., Tambareau Y., Tosquella J., ZAKREVSKAYA E., 1998 - Larger Foraminiferal Biostratigraphy Of The Tethyan Paleocene And Eocene. Bull. Soc. géol. France, 169 (2): 281-299.

  20. Propiedades mecánicas de las uniones por láser de aceros inoxidables dúplex

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    Amigó, V.

    2005-04-01

    Full Text Available The welded joints of stainless steels always present problems for the microstructural modifications that occur in the heat affected zone. Particularly, duplex stainless steels present very important changes when the weld pool solidifies forming fundamentally ferritic structures with some austenite in grain boundaries. These microstructural modifications, and those which occur in the HAZ, justify the mechanical properties of the joint and mainly those of plasticity, being all of them influenced by the processing conditions. In this work the influence of the laser welding speed on the tensile behaviour of duplex stainless steel welded joints is presented. The microstructure of the obtained seams and of the heat affected zone will be evaluated by means of optic and scanning electron microscopy. Also, different microhardness profiles have been obtained to evaluate the modifications in the mechanical properties both in the seam and the zone of thermal affection.

    Las uniones soldadas de aceros inoxidables siempre presentan problemas por las modificaciones microestructurales que suceden en la zona afectada por el calor. Particularmente, los aceros inoxidables dúplex presentan cambios microestructurales muy importantes al solidificar el cordón y formar estructuras, fundamentalmente ferríticas, con formación de austenita en borde de grano. Estas modificaciones microestructurales, junto a las que suceden en la ZAC, son las que justifican las propiedades mecánicas de la unión y fundamentalmente las de plasticidad. Y todo ello en función de las condiciones de procesado. En este trabajo se presenta la influencia de la velocidad de soldeo en las propiedades a tracción de uniones soldadas por láser de chapas de acero inoxidables dúplex. La microestructura de los cordones obtenidos y de la zona afectada por el calor se ha evaluado mediante microscopía óptica y electrónica de barrido, y se han obtenido diferentes perfiles de microdureza que

  1. ANÁLISE E COMPARTIMENTAÇÃO MORFOMÉTRICA DA BACIA HIDROGRÁFICA DO ALTO RIO DAS VELHAS – REGIÃO CENTRAL DE MINAS GERAIS

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    Luis Felipe Soares Cherem

    2011-11-01

    Full Text Available A bacia hidrográfica do Rio das Velhas, porção central de Minas Gerais, é objeto de estudos geomorfológicos desde o início do século XX e, durante esse período, avanços conceituais e metodológicos permitiram que os resultados obtidos inicialmente fossem reinterpretados num novo contexto científico. Os estudos desenvolvidos nessa bacia se concentram em seu alto curso por este corresponder ao núcleo da Província Mineral do Quadrilátero Ferrífero, uma paisagem montanhosa peculiar marcada por forte condicionamento litológico, estrutural e tectônico. Entretanto, o foco de análise da geomorfologia regional ainda não havia se voltado à análise morfométrica dessa bacia hidrográfica. Essa análise permite a compartimentação de bacias hidrográficas em agrupamentos de sub-bacias com características homogêneas e, consequentemente, subsidia estudos geomorfológicos de outra natureza e o planejamento e a gestão ambiental do território. Nesse contexto, esse artigo visa fornecer esse tipo de subsídio para a bacia hidrográfica do alto Rio das Velhas. Para tanto, são apresentadas a análise e a compartimentação morfométricas dessa bacia, avaliando a significância estatística das Leis de Horton e a distribuição espacial dos demais parâmetros morfométricos. Os resultados indicam o agrupamento de sub-bacias para nove dos onze parâmetros morfométricos avaliados. Esse comportamento permite a compartimentação dessa bacia em cinco grupos, cuja diferenciação se deve a aspectos lito-estruturais e tectônicos. Observa-se que os aspectos litológicos condicionam a composição desses agrupamentos, sendo os principais elementos na configuração do relevo e da rede de drenagem, embora haja variação morfométrica entre as porções E e W no granito-gnaisse do Complexo do Bação

  2. Effect of natural aging on the microstructural regions, mechanical properties, corrosion resistance and fracture in welded joints on API5L X52 steel pipeline

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    Vargas-Arista, Benjamín

    2014-09-01

    Full Text Available A characterization study was done to analyze how microstructural regions affect the mechanical properties, corrosion and fractography of the Heat Affected Zone (HAZ, weld bead and base metal for pipe naturally aged for 21 years at 30 °C. Results showed that microstructures exhibited damage and consequently decrease in properties, resulting in over-aged due to service. SEM analysis showed that base metal presented coarse ferrite grain. Tensile test indicated that microstructures showed discontinuous yield. Higher tensile strength was obtained for weld bead, which exhibited a lower impact energy in comparison to that of HAZ and base metal associated with brittle fracture by trans-granular cleavage. The degradation of properties was associated with the coarsening of nano-carbides observed through TEM images analysis, which was confirmed by SEM fractography of tensile and impact fracture surfaces. The weld bead reached the largest void density and highest susceptibility to corrosion in H2S media when compared to those of the HAZ and base metal.Se realizó un estudio de caracterización para analizar cómo la microestructura afecta a las propiedades mecánicas, corrosión y fractura de la zona afectada por calor (ZAC, soldadura y metal base para tubería envejecida naturalmente durante 21 años a 30 °C. Los resultados indicaron que las microestructuras presentaron daño y consecuentemente reducción en propiedades mecánicas, como consecuencia del envejecimiento por servicio. El estudio mediante MEB mostró que el metal base presenta grano ferrítico grueso. La prueba de tensión indicó que las microestructuras mostraron fluencia discontinua. La mayor resistencia a la tracción se presentó en la soldadura, la cual alcanzó menor energía de impacto en comparación con la ZAC y metal base asociado con fractura frágil por clivaje transgranular. La degradación de las propriedades está en relación con el engrosamiento de nanocarburos observados a

  3. Aplicación del láser de diodo para la soldadura en tailored blanks

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    Bocos, J. L.

    2004-04-01

    Full Text Available During the last years, one of the most interesting subjects in the automotive industry is the weight reduction of the automobile, and so to diminish the fuel consumption. Among other performances, the use in the body car of materials which have high mechanical resistance must be considered for the weight reduction of the automobile and maintaining high benefits. In this work, it has been studied the utilization of the diode laser for high resistance steel sheets welding, concretely microalloying steels (ZStE, DP "dual phase" and TRIP "transformation induced plasticity". These steels can be employed in "tailored blanks", which are defined as two or more separate pieces of flat material of dissimilar thickness and/or physical properties joined together before forming, to provide superior qualities in the finished stamped part. In this study, the metallographic characterization has been realised in the welding seams; and the mechanical behaviour has been analysed employing the following tests: microhardness, drawing, tensile and fatigue.

    Uno de los puntos de mayor interés para la industria de la automoción, en los últimos años, es la reducción en peso del automóvil y conseguir, con ello, rebajar el consumo de combustible. Disminuir el peso del automóvil y mantener unas elevadas prestaciones implica, entre otras actuaciones, la utilización de materiales en la carrocería que posean una elevada resistencia mecánica. En este trabajo se presenta el estudio de la viabilidad de la utilización del láser de diodo para la soldadura de chapas de acero de alta resistencia; concretamente de aceros ferríticos microaleados (ZStE, DP (dual phase y TRIP (transformation induced plasticity. Todos ellos, son materiales que pueden formar parte de tailored blanks que se definen como piezas constituidas por la unión, mediante soldadura, de chapas de acero de distintas calidades y espesores. En este estudio se ha profundizado en

  4. Influencia de la composición química de diferentes chatarras de acero sobre las propiedades mecánicas de la fundición con grafito esferoidal

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    Asenjo, I.

    2011-08-01

    producir piezas con estructuras perlíticas y/o ferrítico-perlíticas. En ningún caso se ha detectado la formación de carburos.

  5. Pollen storages in nests of bees of the genera Partamona, Scaura and Trigona (Hymenoptera, Apidae Pólen estocado nos ninhos de abelhas dos gêneros Partamona, Scaura e Trigona (Hymenoptera, Apidae

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    André Rodrigo Rech

    2011-09-01

    Full Text Available Bees and angiosperms established a mutualistic relationship along the evolutionary time. The aim of this study is to contribute for the understanding of this relation analyzing pollen stored by stingless bees colonies distributed along the Rio Negro. Fourteen species of Meliponini from the genera Partamona, Scaura, and Trigona were studied with regard to the content of pollen pots. The pollen material was removed from the pollen pots, homogenized, and prepared according to the usual acetolysis technique. The overlap of the trophic niche and the grouping of species by similarity of niches was calculated. The identification revealed 78 pollen types belonging to 36 families, being 37 types attractive and 16 considered as promoters of a temporary specialization event. With the results, it was possible to indicate a list of important plants for meliponiculture in the Amazon.Abelhas e plantas estabeleceram ao longo do tempo evolutivo uma relação mutualística. Buscando contribuir para o entendimento dessa relação, foi analisado o pólen estocado por colônias de abelhas-sem-ferrão distribuídas ao longo do rio Negro. Foram estudados potes de pólen de 14 espécies de Meliponini dos gêneros Partamona, Scaura e Trigona. O material polínico foi retirado dos potes de pólen, homogeneizado e preparado segundo técnica usual de acetólise. Foram calculados a sobreposição de nicho trófico e o agrupamento das espécies pela similaridade de nichos. Foi identificado o total de 78 tipos polínicos, pertencentes a 36 famílias, sendo 37 destes, considerados atrativos, enquanto 16 foram promotores de eventos de especialização temporária. Com os resultados obtidos foi possível indicar uma lista de plantas de importância para a meliponicultura na Amazônia.

  6. La docencia sobre alfabetización mediática en las facultades de Educación y Comunicación

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    María de la Cinta Aguaded Gómez

    2015-01-01

    Full Text Available El presente trabajo forma parte de un proyecto I+D integrado por trece universidades españolas en el que se estudian las necesidades y carencias en materia de educación mediática en el ámbito de la enseñanza superior, tanto en las áreas de Comunicación (Comunicación Audiovisual, Periodismo y Publicidad como de Educación (Magisterio, Pedagogía, Psicopedagogía y Educación Social. Esta investigación centra su objeto de estudio en el análisis de los manuales universitarios más utilizados en Educación y Comunicación, en asignaturas directamente relacionadas con la educación mediática. Este informe se ha desarrollado en base a seis dimensiones competenciales mediáticas: lenguajes, tecnología, procesos de interacción, procesos de producción y difusión, ideología y valores y estética. De cada uno de estos parámetros se ha tenido en cuenta el ámbito del análisis y de la expresión, partiendo de las pautas señaladas por Ferrés y Piscitelli en su conocida propuesta articulada de indicadores para definir la nueva competencia mediática, que se ha estructurado en torno a dos ámbitos de trabajo: el de la producción de mensajes propios y el de la interacción con otros ajenos. Los resultados han sido obtenidos mediante la aplicación de una metodología cuantitativa, a través de un análisis de contenido por campos semánticos. Las principales conclusiones extraídas apuntan hacia una mayor presencia de la dimensión Ideología y Valores, y una casi inexistente representación de la dimensión Estética.

  7. Underdiagnosis and prognosis of chronic obstructive pulmonary disease after percutaneous coronary intervention: a prospective study

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    Almagro P

    2015-07-01

    Full Text Available Pere Almagro,1 Anna Lapuente,2 Julia Pareja,1 Sergi Yun,1 Maria Estela Garcia,3 Ferrán Padilla,4 Josep Ll Heredia,2 Alex De la Sierra,1 Joan B Soriano5 1Department of Internal Medicine, 2Pneumology Service, Mutua de Terrassa University Hospital, Terrassa, Spain; 3Medical Department, Menarini Pharmaceutical, Barcelona, Spain; 4Cardiology Service, Mutua de Terrassa University Hospital, Terrassa, Spain; 5Instituto de Investigación Sanitaria Princesa (IP, Universidad Autónoma de Madrid, Madrid, Spain Background: Retrospective studies based on clinical data and without spirometric confirmation suggest a poorer prognosis of patients with ischemic heart disease (IHD and chronic obstructive pulmonary disease (COPD following percutaneous coronary intervention (PCI. The impact of undiagnosed COPD in these patients is unknown. We aimed to evaluate the prognostic impact of COPD – previously or newly diagnosed – in patients with IHD treated with PCI.Methods: Patients with IHD confirmed by PCI were consecutively included. After PCI they underwent forced spirometry and evaluation for cardiovascular risk factors. All-cause mortality, new cardiovascular events, and their combined endpoint were analyzed.Results: A total of 133 patients (78% male, with a mean (SD age of 63 (10.12 years were included. Of these, 33 (24.8% met the spirometric criteria for COPD, of whom 81.8% were undiagnosed. IHD patients with COPD were older, had more coronary vessels affected, and a greater history of previous myocardial infarction. Median follow-up was 934 days (interquartile range [25%–75%]: 546–1,160. COPD patients had greater mortality (P=0.008; hazard ratio [HR]: 8.85; 95% confidence interval [CI]: 1.76–44.47 and number of cardiovascular events (P=0.024; HR: 1.87; 95% CI: 1.04–3.33, even those without a previous diagnosis of COPD (P=0.01; HR: 1.78; 95% CI: 1.12–2.83. These differences remained after adjustment for sex, age, number of coronary vessels affected

  8. On the roto-translatory internal motions of a three layer non-isobarycentric Earth model: a Lagrangian system approach

    Science.gov (United States)

    Escapa, Alberto; Fukushima, Toshio

    2010-05-01

    of this relative motion, three characteristic proper modes appear: one in the direction of the figure axis (polar mode) and two orthogonal to it (equatorial modes). These modes are usually referred as Slichter triplet. In the case of the polar mode, Busse (1974) determined analytically its expression in an implicit way; later other authors have obtained by numerical methods the values of all the modes (e.g Rieutord 2002). These expressions differ substantially from the single degenerate mode existing for a non-rotating model, the differences arising from the roto-traslatory coupling of the system. To construct an analytical description of the motion of this non-isobarycentric Earth model we have approximated it by a Lagrangian system, inspired in the successful of this variational approach to tackle the rotational dynamics of isobarycentric Earth models (e.g. Moritz 1982, Getino and Ferrándiz 2001). In this way, the fluid flow is represented as the sum of a rigid motion part plus a potential motion part. In this way, the resulting dynamical system is described by means of nine generalized co-ordinates. Once constructed the kinetic energy of each layer of the Earth model and the potential energy due to the gravitational interaction of the spherical rigid inner core with the fluid, we form the Euler-Lagrange equations of the system which turn out to be non-linear. By assuming a small departure with respect to the steady rotation configuration we linearice the differential equations of the motion, deriving from them the analytical expressions of the Slichter triplet. These expressions are compared with the existing numerical ones, appearing some discrepancies between both approaches. They might be caused by neglecting the non-linear terms in the resolution of the equations or by an incomplete description of the fluid flow. However, the numerical values of the modes derived with this treatment show a great improvement with respect to the values obtained from performing

  9. 40Ar/39Ar ages (600-570 Ma of the Serra do Azeite transtensional shear zone: evidence for syncontractional extension in the Cajati area, southern Ribeira belt

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    Rômulo Machado

    2007-12-01

    Full Text Available This paper presents 40Ar/39Ar ages of the rocks from the Serra do Azeite transtensional shear zone in the southern part of the Ribeira belt, between the States of São Paulo and Paraná, and also discusses the regional correlations and the tectonic implications for other parts of the belt. The geochronological data suggest that transtensional deformation was active between 600 and 580 Ma (hornblende and muscovite apparent ages, respectively. This time span is considerably older than previous proposals for the period of activity of these structures (520-480 Ma in the northern segment of this belt and in the Araçuaí belt. Kinematic analysis of the dated mylonites shows extensional structures with top-down movement to ESE compatible with structures found in other tectonic segments in the eastern portion of the Quadrilátero Ferrífero and in the Rio Doce Valley region. Our ages are situated in the same time interval defined for the alkaline magmatism of the Serra do Mar suite. We suggest that the regional tectonic framework was developed during continental-scale extension. This process has been coeval with convergent strain in the adjacent Neoproterozoic shear zones of the Apiaí/Ribeira and Araçuaí belts, which make up significant segments of these belts. The available data show that these structures may not be simply related to post-orogenic gravitational collapse, but must involve a more complex process probably related to dynamic balance between crustal thickening and thinning during tectonic convergence, basin formation and exhumation processes.Este trabalho apresenta idades 40Ar/39Ar de rochas da Zona de Cisalhamento Transtrativa Sinistral da Serra do Azeite, situada na parte sul do cinturão Ribeira, entre os Estados de São Paulo e Paraná, bem como discute a correlação regional e as implicações tectônicas com outras partes do cinturão. Os dados geocronológicos sugerem que a deformação extensional foi ativa entre 600 e 580 Ma

  10. Catálogo de las arañas (Araneae de la Comunidad de Madrid

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    Ferrández, M. A.

    2006-05-01

    Full Text Available In this catalogue we seek to compile information about spiders in Comunidad de Madrid in order to evaluate the level of our knowledge in the context of the Iberian fauna as well as to promote studies leading to their conservation. For this catalogue we have compiled information coming from both published and unpublished mentions from university thesis, classified specimens from the collections of the Museo Nacional de Ciencias Naturales and the results of a specific sampling carried out by M. A. Ferrández and H. Fernández de Céspedes in the San Agustín de Guadalix area. The nomenclature is based on Platnick’s world catalogue (2005 as well as on Morano’s work on the ibero-balearic fauna (2005 both available on the net. For each species we include: locality of record, UTM coordinates, original publication name and bibliographical references or museum where the material is kept. Madrid’s fauna of spiders has 261 species at present, belonging to 133 genera from 36 different families, 52% of which are cited from first time (marked with *. The general conclusion is that there is very little data about most species, those that do exist are often outdated and they lack relevant information about biological cycles, ecology, etc. There are still great many species to be recorded in the fauna of Madrid and estimates range between 350 and 400 species in total. It must be pointed that 24 out of 261 total species are endemic species from the Iberian Peninsula, some only collected very recently: Ozyptila umbraculorum (2002, Clubiona aducta, Parachtes teruelis (2005 and Amphiledorus balnearicus (in this paper.

    Con la confección del presente catálogo se pretende recopilar la información faunística disponible sobre las arañas de la Comunidad de Madrid, valorar el grado de conocimiento en el contexto de la fauna ibérica, así como impulsar los estudios encaminados a su conservación. Para su elaboración se han

  11. La inoculación de plantas con Pantoea sp., bacteria solubilizadora de fosfatos, incrementa la concentración de P en los tejidos foliares Plant inoculation with Pantoea sp., phosphate solubilising-bacteria increases P concentration in leaf tissues

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    Ortega-Rodés Patricia

    2008-07-01

    Full Text Available El fósforo (P es un macronutriente mineral esencial para las plantas. Aunque puede encontrarse en los suelos en diferentes formas minerales, la baja solubilidad de estos disminuye su disponibilidad para las plantas, y el nutriente debe aplicarse como fertilizante a los cultivos. Las reservas mundiales de P son limitadas y tendrán una reducción considerable en los próximos años. Usar microorganismos solubilizadores de fosfatos como inoculante para los cultivos es una alternativa biotecnológica para incrementar la disponibilidad del nutriente. Pantoea sp. (cepa 9C es una bacteria endofítica fijadora de nitrógeno, aislada del interior de tallos de la caña de azúcar (Loiret et ál., 2004; este microorganismo produjo halos de solubilización con tamaños de hasta 6 mm en medio sólido NBRI-P en 7 días a 30 ºC, y en ese tiempo y condiciones solubilizó Ca3(PO42 en el medio líquido hasta acumular 1128 μg P mL-1. La bacteria sobrevivió durante 35 días en un sustrato preparado con mezcla de Vermiculita y suelo ferralítico rojo (Cambisol Ferrálico, ródico, alcanzando poblaciones de 3,2 x 1015 células g-1. Plantas de rábano (Raphanus sativus, L. var. Scarlet Globe, de alta demanda de P y crecimiento rápido, usadas como modelo y cultivadas en suelos inoculados con el microorganismo, absorbieron más P que las plantas no inoculadas, alcanzando en los tejidos foliares concentraciones ≥ 3500 ppm P base seca. Palabras clave: bacteria endofítica; solubilización de fosfatos; rábano (Raphanus sativus, L.; caña de azúcar (Saccharum híbrido.Phosphorus is an essential mineral macronutrient for plant growth and development. Although it can be found in soils in different mineral forms, its low solubility decrease its availability for plants; the nutrient should be added to crops as fertiliser. World sources of P are limited and in the near future they will suffer a remarkable decrease. Using P solubiliser microorganisms as

  12. Advanced FeCrAl ODS steels for high-temperature structural applications in energy generation systems

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    Pimentel, G.

    2012-08-01

    -30 bar. Los aceros ODS ferríticos son la clase de material avanzado específicamente diseñado para trabajar en ambientes altamente corrosivos y a temperaturas elevadas. Pero para mejorar la resistencia a la fluencia a altas temperaturas en dirección circunferencial, la microestructura generada en el proceso de recristalización ha de ser diferente a la microestructura axi-simétrica altamente anisótropa que tiene este tipo de aceros por defecto. En este sentido, este trabajo detalla los resultados obtenidos en la aleación reforzada por dispersión de óxidos PM 2000 que ha sido fabricada por técnicas pulvimetalúrgicas, consolidada por extrusión y conformada por laminación en caliente y en frio. De los resultados obtenidos puede concluirse que una microestructura heterogénea estimula su recristalización, de forma que grandes gradientes de deformación generan microestructuras más finas e isótropas. La comparación de estos resultados con simulaciones por elementos finitos ha permitido dilucidar el papel que tienen las tensiones residuales subyacentes en la microestructura en la generación de la microestructura recristalizada.

  13. AS RACIONALIDADES SUBSTANTIVA E INSTRUMENTAL NA PRÁTICA ORGANIZACIONAL: um olhar sobre Guerreiro Ramos e os estudos organizacionais

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    Lucas Tadeu Cerri

    2017-06-01

    Full Text Available Este trabalho de cunho qualitativo se propôs compreender como se entrelaçam as racionalidades substantiva e instrumental no cotidiano dos gestores de primeira linha de uma multinacional e alguns funcionários de alto escalão de um órgão público na região do quadrilátero ferrífero em Minas Gerais. A coleta de dados ocorreu por meio da entrevista semiestruturada, que foram gravadas, transcritas e posteriormente analisadas via Análise de Conteúdo de Bardin (2006. A base teórica que fomentou as análises foram os trabalhos de Guerreiro Ramos (1981 e Maurício Serva (1996. Diante disso foi possível identificar 11 rubricas previstas por Serva (1996, entendidas nas análises como unidades de sentido; estas foram classificadas por proporção conforme sua aparição nos relatos; são elas: valores e objetivos, satisfação individual, reflexão, controle, tomada de decisão, divisão do trabalho, hierarquia e normas, conflito, ação social, relações interpessoais e dimensão simbólica. A presença da racionalidade instrumental ainda é latente no cotidiano analisado, sendo necessária alguma evolução para que esse modelo reificado do ser humano se altere. Todavia, tal pesquisa se mostra relevante, pois permitiu verificar uma manifestação considerável da racionalidade substantiva em um ambiente supostamente instrumental.   This qualitative study was proposed to understand how the substantive and instrumental rationalities are interwoven in the daily life of first-line managers of a multinational and some high-ranking officials from a public agency in the iron quadrilateral region of Minas Gerais. The data were collected through semi-structured interviews, which were recorded, transcribed and analyzed through Bardin Content Analysis (2006. A theoretical basis that fostered as analyzes were the works of Guerreiro Ramos (1981 and Maurício Serva (1996. Thus, it was possible to identify 11 items predicted by Serva (1996, understood in

  14. Numerical investigations of solute transport in bimodal porous media under dynamic boundary conditions

    Science.gov (United States)

    Cremer, Clemens; Neuweiler, Insa; Bechtold, Michel; Vanderborght, Jan

    2016-04-01

    behavior depends on the magnitude of the flow rates and hydraulic conductivity curves of the materials. Based on the unsaturated hydraulic conductivity at the intersection point of conductivity curves, we are able to define an estimate of flow rates at which the dynamic of the upper boundary condition significantly alters preferential flow paths through the system. If flow rates are low, with regard to the materials hydraulic conductivity at the intersection point, the influence of dynamic boundary conditions is small. If flow rates are in the range of the unsaturated hydraulic conductivity at intersection, solute is trapped in the fine material during upwards transport, which results in a more pronounced tailing. For flow rates exceeding the intersection conductivity, a redistribution at the soil surface can occur. References: Bechtold, M., S. Haber-Pohlmeier, J. Vanderborght, A. Pohlmeier, T.P.A. Ferré and H. Veerecken. 2011a. Near-surface solute redistribution during evaporation. Geophys. Res. Lett., 38, L17404, doi:10.1029/2011GL048147. Bechtold, M., J. Vanderborght, O. Ippisch and H. Vereecken. 2011b. Efficient random walk particle tracking algorithm for advective dispersive transport in media with discontinuous dispersion coefficients and water contents. Water Resour. Res., 47, W10526, doi: 10.1029/2010WR010267. Ippisch O., H.-J. Vogel and P. Bastian. 2006. Validity limits fort he van Genuchten-Mualem model and implications for parameter estimation and numerical simulation. Adv. Water Resour., 29, 1780-1789, doi: 10.1016/j.advwateres.2005.12.011. Lehmann, P. and D. Or. 2009. Evaporation and capillary coupling across vertical textural contrasts in porous media. Phys. Rev. E, 80, 046318, doi:10.1103/PhysRevE.80.046318.

  15. Influência do teor de Mo na microestrutura de ligas Fe-9Cr-xMo Effect of the content of molybdenum in the microstructure of Fe-9Cr-xMo alloy

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    Rodrigo Freitas Guimarães

    2010-12-01

    Full Text Available Aços Cr-Mo são usados na indústria do petróleo em aplicações com óleos crus ricos em compostos sulfurosos. Aços comerciais como 2.5Cr1Mo ou 9Cr1Mo têm se mostrado ineficientes em consequência de altos índices de corrosão naftênica. Uma estratégia para resolver este problema é o aumento do teor de molibdênio destes aços. Neste trabalho foi estudado o efeito do aumento do teor de molibdênio na microestrutura de ligas Fe-9Cr-xMo, solubilizadas e soldadas. Foram levantados os diagramas de fases com auxílio de um programa comercial para verificar as possíveis fases a serem formadas e identificar os problemas de soldagem. A microestrutura das ligas solubilizadas foi analisada por microscopia óptica e EBSD, além da medição da dureza. Foram realizadas soldagens autógenas para verificar o efeito do aporte térmico na microestrutura e na dureza das ligas. O aumento do teor de molibdênio resultou no aumento da dureza das ligas. A análise microestrutural das ligas soldadas apresentou uma particularidade para a liga com menor teor de molibdênio, a presença de martensita. Já as ligas com maior teor de molibdênio apresentaram uma microestrutura completamente ferrítica. A formação de martensita pode ser um problema na solda da liga com menor teor de molibdênio, uma vez que a mesma pode causar perdas nas propriedades mecânicas comprometendo sua aplicação.Cr-Mo steels are used in the petroleum industry in applications with crude oils rich in sulfur compounds. 2.5Cr1Mo or 9Cr1Mo do not resist to operating conditions when in contact with crude oils. The increasing of molybdenum content can improve the corrosion resistance of these alloys. This paper studied the effect of increased concentration of molybdenum in the microstructure of Fe-9Cr-xMo alloys, annealed and welded. Phase diagrams were built with the aid of commercial program to check the possible phases to be formed and to identify the problems of welding. Analyses were

  16. Cinéticas de transformación de fases a 850 ºC de aceros inoxidables dúplex clásicos (2205 y 2507 y de uno nuevo de bajo contenido en níquel y alto en manganeso (DBNi

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    Rodríguez, M. P.

    2004-04-01

    Full Text Available Austenitic-ferritic stainless steels are formed by ferrite and austenite in a variable proportion between 30 % and 70 %. Their chemical composition conditions the ageing processes that can happen during heat treatments, where phases that hardens and brittles the material can be generated. Evolution of a new duplex stainless steel with lower nickel and higher nitrogen and manganese content maintained at 1123 K (critical precipitation temperature up to 8 hours compared to classical ones (2205 and 2507 is presented. The study, done by magnetic measurements, XRD, optical and scanning electron microscopy and microanalysis, revealed a roughly similar behaviour for the three steels. The new one presents a higher initial stability, probably due to the high nitrogen and manganese contents; however, it also produces the higher final transformation due to the higher initial ferrite. A fine comparative analysis was done to correctly identify any phase; an accurate microanalysis in every generated phase was performed. All the steels tested are initially made on ferrite and austenite. After the ageing treatment, 8 hours at 1123 K, in the 2205 duplex steel a strong precipitation of sigma phase is observed, austenite and some of the original ferrite are also present; ferrite completely transforms in the 2507 duplex and austenite, sigma, secondary austenite and chromium nitride can be found; regarding the new duplex steel DBNi, austenite, ferrite, sigma, chi and chromium nitrides are detected.

    Los aceros dúplex austeno-ferríticos están constituidos por ferrita y austenita en proporciones variables del 30 % al 70 %. Su composición química condiciona los procesos de envejecimiento que sufren durante los tratamientos térmicos, cuando se generan fases que endurecen y fragilizan el material. Este trabajo estudia la evolución de un nuevo inoxidable dúplex con bajo contenido en níquel y alto en nitrógeno y manganeso a 1123 K (temperatura crítica de

  17. Evaluation of the scale dependent dynamic SGS model in the open source code caffa3d.MBRi in wall-bounded flows

    Science.gov (United States)

    Draper, Martin; Usera, Gabriel

    2015-04-01

    neutrally stratified atmospheric boundary layers over heterogeneous terrain". Water Resources Research, 2006, 42, WO1409 (18 p). [4] J. Keissl, M. Parlange, C. Meneveau. "Field experimental study of dynamic Smagorinsky models in the atmospheric surface layer". Journal of the Atmospheric Science, 2004, 61, 2296-2307. [5] E. Bou-Zeid, N. Vercauteren, M.B. Parlange, C. Meneveau. "Scale dependence of subgrid-scale model coefficients: An a priori study". Physics of Fluids, 2008, 20, 115106. [6] G. Kirkil, J. Mirocha, E. Bou-Zeid, F.K. Chow, B. Kosovic, "Implementation and evaluation of dynamic subfilter - scale stress models for large - eddy simulation using WRF". Monthly Weather Review, 2012, 140, 266-284. [7] S. Radhakrishnan, U. Piomelli. "Large-eddy simulation of oscillating boundary layers: model comparison and validation". Journal of Geophysical Research, 2008, 113, C02022. [8] G. Usera, A. Vernet, J.A. Ferré. "A parallel block-structured finite volume method for flows in complex geometry with sliding interfaces". Flow, Turbulence and Combustion, 2008, 81, 471-495. [9] Y-T. Wu, F. Porté-Agel. "Large-eddy simulation of wind-turbine wakes: evaluation of turbine parametrisations". BoundaryLayerMeteorology, 2011, 138, 345-366.

  18. High-grade iron ore at Windarling, Yilgarn Craton: a product of syn-orogenic deformation, hypogene hydrothermal alteration and supergene modification in an Archean BIF-basalt lithostratigraphy

    Science.gov (United States)

    Angerer, Thomas; Hagemann, Steffen G.; Danyushevsky, Leonid

    2013-08-01

    , carbonate and quartz to form veins and breccia but did not generate significant volumes of iron ore. Ore stage 4 involved Mesozoic(?) to recent supergene oxidation and hydration in a weathering environment reaching down to depths of ˜100 to maximum 200 m below surface. Supergene ore formation involved goethite replacement of dolomite and quartz as well as martitisation. Important `ground preparation' for supergene modification and upgrade were mainly the formation of steep D1 to D4 structures, steep BIF/basalt margins and particularly the syn-D1 to syn-D2 carbonate alteration of BIF that is most susceptible to supergene dissolution. The Windarling deposits are structurally controlled, supergene-modified hydrothermal iron ore systems that share comparable physical, chemical and ore-forming characteristics to other iron ore deposits in the Yilgarn Craton (e.g. Koolyanobbing, Beebyn in the Weld Range, Mt. Gibson). However, the remarkable variety in pre-, syn- and post-deformational ore textures (relative to D1 and D2) has not been described elsewhere in the Yilgarn and are similar to the ore deposits in high-strain zones, such as of Brazil (Quadrilátero Ferrífero or Iron Quadrangle) and Nigeria. The overall similarity of alteration stages, i.e. the sequence of hydrothermal carbonate introduction and hypogene leaching, with other greenstone belt-hosted iron ore deposits supports the interpretation that syn-orogenic BIF alteration and upgrade was crucial in the formation of hypogene-supergene iron ore deposits in the Yilgarn Craton and possibly in other Archean/Paleoproterozoic greenstone belt settings worldwide.

  19. A atuação do jornalista em projetos que aliam a Comunicação e Educação

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    Aline Tainá Amaral Horn

    2014-07-01

    Full Text Available RESUMO Este artigo investiga a atuação profissional do jornalista em projetos que aliam a comunicação e educação e o seu papel como mediador dentro da cultura escolar, na construção de espaços dialógicos e de reflexão. O objeto proposto para estudo é o Televisando o Futuro, projeto que atua nesses dois campos: mídia e educação. Para o embasamento teórico deste artigo, destacam-se os seguintes autores: Barbero (2011, Freire (2008, Wolton (2006, Soares (2011, Férres (2001 e Fischer (2001. O artigo revela as possibilidades dos profissionais de comunicação em desenvolver competências no processo de formação de significados, em sala de aula, que contribuam para a construção de novas perspectivas no processo educomunicativo, rumo a uma sociedade mais crítica e dialógica. Palavras-chave: Mediação. Jornalista. Televisão. ABSTRACT This paper investigates how the journalist works in projects that combine communication and education and how this professional could be a mediator within the school culture to promote opportunities for discussion and reflection. The object proposed of  study is the Televisando o Futuro project that operates in these two fields: media and education. For the theoretical foundation of this article, the following authors were studied: Barbero (2011, Freire (2008, Wolton (2006, Smith (2011, Ferres (2001 and Fischer (2001. The article presents the possibilities of communication professionals to develop skills in the process of formation of meanings in the classroom that contribute to the construction of new perspectives in the communication and education process towards a more critical and dialogical society.   Key words: Mediation. Journalist. Television.                   RESUMEN Este artículo investiga la actividad profesional del periodista en los proyectos que combinan comunicación y educación y su papel como mediador en la cultura escolar, en la construcción de espacios dialógicos y

  20. Effect of ZnO, ZrO2 and B2O3 on clinkerization process. Part I. Clinkerization reactions and clinker composition

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    Palacios, M.

    2008-12-01

    marcadamente la fase ferrítica y el B2O3 estabiliza el C2S. En los clinkeres obtenidos a partir de la adición del 2% de ZnO y ZrO2 se identifica la presencia de nuevas fases mineralógicas, 3CaO·ZnO·2Al2O3, y CaZrO3.

  1. Evaluation of pathogenic fungi occurrence in traumatogenic structures of freshwater fish Avaliação da ocorrência de fungos patogênicos em estruturas traumatogênicas de peixes fluviais

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    Fabio Caetano Oliveira Leme

    2011-04-01

    Full Text Available INTRODUCTION: Fungal infections in human skin, such as sporotrichosis, can occur after fish induced trauma. This work aimed to identify fungi in freshwater fish that are pathogenic to humans. METHODS: Extraction of dental arches from Serrassalmus maculatus (piranha and Hoplias malabaricus (wolf fish, stings from Pimelodus maculatus (mandis catfish, dorsal fin rays from Plagioscion spp. (corvina and Tilapia spp., for culture in Mycosel agar. Some cultures were submitted to DNA extraction for molecular identification by sequencing ITS-5.8S rDNA. RESULTS: Cultures identified most yeast as Candida spp., while sequencing also permitted the identification of Phoma spp. and Yarrowia lipolytica. CONCLUSIONS: While the search for S. schenckii was negative, the presence of fungus of the genera Phoma and Candida revealed the pathogenic potential of this infection route. The genus Phoma is involved in certain forms of phaeohyphomycosis, a subcutaneous mycosis caused by dematiaceous fungi, with reports of infections in human organs and systems. Traumatizing structures of some freshwater fish present pathogenic fungi and this may be an important infection route that must be considered in some regions of Brazil, since there are a large number of a fisherman in constant contact with traumatogenic fish.INTRODUÇÃO: Infecções fúngicas na pele humana (como a esporotricose podem se manifestar após traumatismos por peixes. O objetivo deste trabalho é procurar fungos patogênicos para o homem em peixes fluviais. MÉTODOS: Extração de arcadas dentárias Serrassalmus maculatus (piranha e Hoplias malabaricus (traíra, ferrões de Pimelodus maculatus (mandis, raios da nadadeira dorsal de Plagioscion spp. (corvina e Tilapia spp. para a realização do cultivo em agar Mycosel. Algumas culturas foram submetidas à extração de DNA para a identificação molecular pelo seqüenciamento da região ITS-5.8S do rDNA. RESULTADOS: As culturas mostraram que a maioria das

  2. Comunidade de abelhas (Hymenoptera, Apoidea e plantas em uma área do Agreste pernambucano, Brasil Community of bees (Hymenoptera, Apoidea and plants in an area of Agreste in Pernambuco, Brazil

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    Paulo Milet-Pinheiro

    2008-01-01

    Full Text Available O Agreste é uma região de transição entre floresta tropical úmida e caatinga no nordeste brasileiro. Nessa região, grande parte da vegetação nativa foi desmatada para a implantação de pastagens. Não é sabido se áreas degradadas mantém uma apifauna e flora melitófila diversificada, ou quais são associações entre abelhas e plantas que ocorrem nessas áreas. A cobertura vegetal atual é composta por pastos, vegetação ruderal e restos da vegetação nativa. Abelhas e plantas por elas visitadas foram coletadas mensalmente entre agosto de 2001 e julho de 2002, durante dois dias consecutivos entre 5h30 e 17h30. Foram coletados 1.004 indivíduos de abelhas pertencentes a 79 espécies. Apidae foi a família mais abundante e com maior riqueza de espécies (732 indivíduos e 43 espécies, seguida por Halictidae (194 indivíduos e 20 spp., Megachilidae (47 indivíduos e 13 spp., Colletidae (16 indivíduos e 2 spp. e Andrenidae (15 indivíduos e 1 sp.. Foram registradas apenas três espécies de abelhas eussocais e cinco de Euglossini, dois grupos altamente diversificados nas florestas neotropicais. A ausência de abelhas sem ferrão nativas dos gêneros Plebeia, Frieseomelitta, Partamona, Scaptotrigona e Trigonisca, assim como de outras espécies de Euglossini, deve estar relacionada à falta de sítios de nidificação e à escassez de fontes de pólen e néctar nessa área degradada. Foram registradas 87 espécies de plantas melitófilas, a maioria ervas e arbustos. Árvores nativas isoladas, assim como plantas ornamentais e frutíferas cultivadas contribuem para manter parte da diversidade da comunidade de abelhas nativas.The Agreste is a transition region of tropical rainforest and Caatinga in northeastern Brazil. In this region, the majority of the native Atlantic Rainforest was destroyed to give place to livestock farming. It is not known whether degraded areas maintain a diversified bee-plant community or not and which kinds of

  3. Divergências morfométricas entre populações isoladas de Melipona subnitida Ducke (Hymenoptera: Apidae no semiárido

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    José Aldenor de Souza

    2014-12-01

    Full Text Available Este trabalho teve por objetivo realizar um estudo morfométrico desta espécie de abelha criada em condições artificiais no semiárido brasileiro, com a finalidade de verificar divergência em sua morfologia, de forma a identificar possíveis variações dessa espécie. As abelhas foram coletadas de criadores de abelhas sem ferrão distintos, de duas localidades sendo uma delas o município de São João do Rio do Peixe, Paraíba-PB, sob as coordenadas: lat. 06° 43' 44" S e long. 38° 26' 56" W. E a outra no município de Mossoró sob as coordenadas lati. 5°03'40’’ S, long. 37º23'51’ W. Distantes 262 quilômetros entre si. O período da pesquisa compreendeu os meses de dezembro de 2012 a janeiro do ano de 2013. Foram avaliados 200 cortiços, e identificados 30 de maior percentual de produção, de onde foram selecionados aleatoriamente 10 para nível de coletas dos insetos em cada localidade. Foram coletadas 60 abelhas operárias, sendo 3 abelhas referentes a cada cortiço. Os parâmetros avaliados dentro do estudo morfométrico foram: Comprimento Transversal, Comprimento Longitudinal, Pernas Coletoras Asas Anteriores Asas Posteriores e Peso por Inseto. Em relação a características avaliadas foram constatadas diferenças significativas entre todas quando se trata dos indivíduos das duas localidades. Corroborando a existência de variabilidade morfométricas entre as localidades. Na análise discriminante obtida para classificação de indivíduos entre as localidades, o município de são João do Rio do Peixe obteve uma taxa de classificação Correta de 100,0%, já para Mossoró a taxa foi de 96,67%, sendo que a média geral foi de 98,33%. Pela validação cruzada, estas localidade tiveram, respectivamente, identificação correta de seus indivíduos com taxas de 100% e 93,33%. A média geral da validação cruzada foi de 96,97%. As variações de tamanho encontradas neste trabalho constatadas pela morfometria demonstram que as

  4. Caracterización dinámica de los cambios microestructurales en barras de aceros dúplex SAF 2205 utilizando la dimensión de información

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    Rodríguez, Edda

    2014-03-01

    Full Text Available This study evaluates the ultrasonic signals behavior of a duplex stainless steel SAF 2205 (UNS S31803 after aging treatments at 875 and 950 °C. The first treatment promotes the precipitation of the sigma phase and the second, its dissolution. The microstructural evaluation was carried out by optical microscopy. The results showed an increase of the sigma phase fraction and the secondary austenite with the time of aging treatment at 875 °C. On the other hand, increasing the time of treatment at 950 °C promotes a reduction of the sigma phase and the corresponding increase of the ferrite phase fraction. The study proposed to evaluate in the dynamical system field the influence of microstructural phases in the signals behavior and their dependence on the energy losses occurring in system during heat treatment, by deterministic chaos theory. To accomplish characterization, algorithm employs the representation of dynamic phase space and the information dimension estimate. The results show a higher correlation between the information dimension and the attenuation coefficient in comparison with the phase fractions. However, the efficiency of this type of study will depend on the frequency selected for the evaluation of the material.En el presente estudio se evalúa el comportamiento dinámico de las señales ultrasónicas de muestras de acero dúplex SAF 2205 (UNS31803, sometidos a tratamientos de envejecimiento a 875 y 950 °C. En el primer tratamiento se promueve la precipitación de la fase sigma y en el segundo su disolución. Los resultados obtenidos por microscopía óptica indican que la cantidad relativa de la fase sigma aumenta progresivamente con el tiempo de envejecimiento a 875 °C, observándose la transformación de la fase ferrita en fase sigma y en austenita secundaria. Por otra parte, a medida que se aumenta el tiempo de tratamiento a 950 °C, se observa una reducción del porcentaje de fase sigma y un aumento de la fase ferr

  5. Identifying knickpoints using elevation breaks and offsets in slope-area scaling

    Science.gov (United States)

    Peifer Bezerra, Daniel; Persano, Cristina

    2017-04-01

    passive margin river system, the Quadrilátero Ferrífero - Brazil, that exhibits (i) high relief (max. relief is 1400 m, max. elevation is 2080 m); (ii) presence of knickpoints; (iii) an absence of Quaternary glaciation. Therefore, we seek to test the different methods of identification of knickpoints in a mountainous landscape where we had field constraints of knickpoints. There are two main criteria for the identification of knickpoints: (1) elevation/gradient breaks or; (2) offsets in trends of slope-area scaling. Both of those criteria are somehow subjective as the values for the breaks in (1) as well as the regression limits for the slope-area scaling (2) are arbitrary. We show that the use of those different criteria prescribes different results; the knickpoints identified for both methods are not interchangeable. The method (1) define a higher number of knickpoints than (2) that are more easily identified in the field than the knickpoints that stem from (2). Many times the knickpoints identified from (1) are subsequent, meaning that they are a knickzone rather than a knickpoint. The method (2) is more robust for the characterization of knickzones than (1). We suggest a combined approach for the identification of knickpoints as well as arbitrary values for defining it.

  6. A influência da composição do esteatito (pedra-sabão na migração de minerais para os alimentos: minerais do esteatito The influence of the steatite (soapstone composition in mineral migration to food meal: minerals from steatite

    Directory of Open Access Journals (Sweden)

    K. D. Quintaes

    2006-12-01

    Full Text Available O esteatito, rocha metamórfica composta por talco, dolomita e anfibólios, é abundantemente encontrado no Quadrilátero Ferrífero brasileiro, em Minas Gerais. O esteatito tem aplicação industrial, sendo também usado na confecção de esculturas e utensílios culinários, conhecidos como panelas de pedra-sabão. A tradição na aplicação culinária das panelas de pedra-sabão ainda se mantém ativa. Cerca de 80% da população nativa de Ouro Preto (MG, Brasil possui as referidas panelas, sendo que estas são usadas no preparo de alimentos por 63% dos seus habitantes. A sabedoria popular indica que seu uso auxilia no tratamento e prevenção da anemia ferropriva. Porém, mesmo sendo o esteatito um dos primeiros materiais usados pelo homem na fabricação de utensílios para contato com alimentos, o respaldo acadêmico sobre sua interação com alimentos é recente e pontual. Pela ausência de dados, os primeiros testes feitos usaram simulantes de alimentos a fim de predizer o comportamento do material nas condições domésticas de uso: cocção e estocagem de alimentos. A migração de metais como ferro, cálcio, magnésio e manganês, além de níquel, foi constatada nestes estudos. Todavia, a migração dos metais durante a vida útil do recipiente continua desconhecida. Ampliar o conhecimento sobre a implicação nutricional dos utensílios culinários de pedra-sabão ainda se faz necessário pela escassez de dados sobre o comportamento deste material. O presente artigo visa, mediante a revisão da literatura, apresentar à comunidade científica os dados disponíveis sobre a composição do esteatito (pedra-sabão e sua influência no contato com alimentos e na saúde humana.Steatite is a metamorphic rock composed mainly of minerals talc, dolomite and amphibolites. It is abundantly found in the Southeast of Brazil especially in the state of Minas Gerais. In addition to its industrial use, it has also been used for manufacture of

  7. Caracterização Hidrossedimentológica e dos Processos Evolutivos de Voçoroca em Área de Rochas Gináissicas do Alto Rio das Velhas (MG

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    Flávio Nasser Drumond

    2006-12-01

    Full Text Available Neste trabalho procurou-se caracterizar os processos erosivos e as taxas históricas de evolução de uma voçoroca em área de gnaisses do Complexo Bação, Quadrilátero Ferrífero (MG, na bacia do alto rio das Velhas. Na área predominam latossolos vermelho-amarelos, com horizontes superficiais areno-argilosos, pouco erodíveis, sobre saprolitos areno-siltosos, muito erodíveis. A evolução erosiva, avaliada por aerofotogrametria e em campo, indicou que a voçoroca, inicialmente de forma linear e de evolução lenta (entre 1951 e 1977, passou a adquirir forma mais anfiteátrica e a avançar mais rapidamente entre 1977 e 1986. Esta mudança pode ser explicada pela superação de um nível de base local (knickpoint. Entre 1986 e 2006, as taxas de avanço decresceram, possivelmente em função da diminuição da área de contribuição à montante. Os principais processos erosivos identificados na voçoroca foram: erosão hídrica superficial (laminar; em sulcos; em alcovas de regressão; e salpicamento; escorregamentos rotacionais que envolvem todo o talude; escorregamentos planares nos segmentos com rocha alterada; queda de blocos de solo; rastejos, nos sopés dos taludes com exfiltração do lençol freático, que podem resultar em pequenos escorregamentos rotacionais. Os processos de erosão são mais intensos no período chuvoso, mas os rastejos e pequenos escorregamentos são igualmente freqüentes na estiagem, quando o lençol freático atinge a cota máxima. O monitoramento hidrossedimentológico na voçoroca incluiu a coleta diária de dados: pluviométricos; de vazão na drenagem interna; de sedimentos transportados; e do nível do lençol freático. O transporte de sedimentos se correlaciona mais com os dados pluviométricos e menos com os dados de vazão, talvez porque nos meados do ano o fluxo de base, de menor erosividade, é mais intenso. Como os taludes mais ativos são aqueles sob exfiltração do lençol freático, a vo

  8. Evolution of Cognitive Rehabilitation After Stroke From Traditional Techniques to Smart and Personalized Home-Based Information and Communication Technology Systems: Literature Review.

    Science.gov (United States)

    Cogollor, José M; Rojo-Lacal, Javier; Hermsdörfer, Joachim; Ferre, Manuel; Arredondo Waldmeyer, Maria Teresa; Giachritsis, Christos; Armstrong, Alan; Breñosa Martinez, Jose Manuel; Bautista Loza, Doris Anabelle; Sebastián, José María

    2018-03-26

    the selection of 8 different ICT-based approaches found in scientific-technical studies, 9 European projects funded by the European Commission that offer eHealth architectures, and other large-scale activities such as smart houses and the initiative City4Age. Stroke is one of the main causes that most negatively affect countries in the socioeconomic aspect. The design of new ICT-based systems should provide 4 main features for an efficient and personalized cognitive rehabilitation: support in the execution of complex daily tasks, automatic error detection, home-based performance, and accessibility. Only 33% of the European projects presented fulfilled those requirements at the same time. For this reason, current and future large-scale initiatives focused on eHealth and smart environments should try to solve this situation by providing more complete and sophisticated platforms. ©José M Cogollor, Javier Rojo-Lacal, Joachim Hermsdörfer, Manuel Ferre, Maria Teresa Arredondo Waldmeyer, Christos Giachritsis, Alan Armstrong, Jose Manuel Breñosa Martinez, Doris Anabelle Bautista Loza, José María Sebastián. Originally published in JMIR Rehabilitation and Assistive Technology (http://rehab.jmir.org), 26.03.2018.

  9. Stellar parametrization from Gaia RVS spectra

    Science.gov (United States)

    Recio-Blanco, A.; de Laverny, P.; Allende Prieto, C.; Fustes, D.; Manteiga, M.; Arcay, B.; Bijaoui, A.; Dafonte, C.; Ordenovic, C.; Ordoñez Blanco, D.

    2016-01-01

    Context. Among the myriad of data collected by the ESA Gaia satellite, about 150 million spectra will be delivered by the Radial Velocity Spectrometer (RVS) for stars as faint as GRVS~ 16. A specific stellar parametrization will be performed on most of these RVS spectra, I.e. those with enough high signal-to-noise ratio (S/N), which should correspond to single stars that have a magnitude in the RVS band brighter than ~14.5. Some individual chemical abundances will also be estimated for the brightest targets. Aims: We describe the different parametrization codes that have been specifically developed or adapted for RVS spectra within the GSP-Spec working group of the analysis consortium. The tested codes are based on optimisation (FERRE and GAUGUIN), projection (MATISSE), or pattern-recognition methods (Artificial Neural Networks). We present and discuss each of their expected performances in the recovered stellar atmospheric parameters (effective temperature, surface gravity, overall metallicity) for B- to K-type stars. The performances for determining of [α/Fe] ratios are also presented for cool stars. Methods: Each code has been homogeneously tested with a large grid of RVS simulated synthetic spectra of BAFGK-spectral types (dwarfs and giants), with metallicities varying from 10-2.5 to 10+ 0.5 the solar metallicity, and taking variations of ±0.4 dex in the composition of the α-elements into consideration. The tests were performed for S/N ranging from ten to 350. Results: For all the stellar types we considered, stars brighter than GRVS~ 12.5 are very efficiently parametrized by the GSP-Spec pipeline, including reliable estimations of [α/Fe]. Typical internal errors for FGK metal-rich and metal-intermediate stars are around 40 K in Teff, 0.10 dex in log(g), 0.04 dex in [M/H], and 0.03 dex in [α/Fe] at GRVS = 10.3. They degrade to 155 K in Teff, 0.15 dex in log(g), 0.10 dex in [M/H], and 0.1 dex in [α/Fe] at GRVS~ 12. Similar accuracies in Teff and [M/H] are

  10. Caracterização sazonal de acúmulos isolados de própolis em colônias de Plebeia emerina (Hymenoptera, Apidae no sul do Brasil Seasonal characterization of isolated propolis clusters in Plebeia emerina (Hymenoptera, Apidae colonies in the south of Brazil

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    Camila G. dos Santos

    2009-06-01

    Full Text Available Em colônias de abelhas sem ferrão a aplicação da própolis é ampla, sendo utilizada como matéria-prima nas construções e defesa contra inimigos. Há registros de armazenamento de própolis viscosa, sob forma de acúmulos isolados. Neste trabalho propõe-se a caracterização sazonal da área, do número e da distribuição espacial dos acúmulos isolados de própolis em colônias de Plebeia emerina (Friese, 1900. Colônias foram avaliadas entre outubro/2003 e setembro/2004, medindo-se mensalmente os acúmulos isolados de própolis e registrando-se a posição relativa dos mesmos nas colméias. Entre outubro e março, a área dos acúmulos de própolis nas colônias variou entre 0,50 e 4,92 cm² e o número de acúmulos foi de 3 a 16. No período de abril a setembro, a área foi de 4,54 a 18,48 cm² e o número de acúmulos de 9 a 36. Sugere-se que o aumento da própolis acumulada possa estar relacionado à preparação das colônias para o outonoinverno quando a coleta do produto é reduzida. A análise sazonal da distribuição dos depósitos isolados de própolis corrobora com os registros da área total, indicando preferência da posição anterior da colônia para acumular a própolis. Esta constatação fortalece a hipótese do uso da própolis viscosa dos depósitos isolados na defesa, principalmente junto à entrada das colônias.In colonies of stingless bees, propolis is used for many applications, such as in raw material for constructions and for their defense against enemies. There are records of viscous propolis storage, in form of isolated clusters. In this work, the seasonal characterization of area, number and spatial distribution of isolated propolis clusters in Plebeia emerina (Friese, 1900 colonies is proposed. Colonies were evaluated between October/2003 and September/2004, by measuring in a monthly basis the isolated propolis clusters and recording the relative position of these clusters within the beehives. Between

  11. Estructura y textura de un meteorito metálico de tipo octaedrita (Gibeon

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    Gil Sevillano, J.

    2000-06-01

    Full Text Available A sample from the meteoritic iron Gibeon (fine octahedrite has been studied combining optical and scanning electron microscopy, crystallographic microtexture by EBSP (Electron Back Scattered Patterns and macrotexture by X-ray diffraction. The sample (approx. 24x23x3 mm, 14.3 g shows the classical Widmastätten structure of intersecting ferrite (kamacite plates grown along {111}γ octahedric previous austenite (taenite planes. Residual layers of austenite are also seen between the ferrite plates as well as larger domains of more complex structures of bainitic type (plessite produced by the last fraction of austenite transformed during extra-terrestrial cooling. The sample structure shows few signs of impact modifications (Neumann bands, etc.. Kamacite plates are divided in weakly misoriented (< 2º subgranular domains. The measurement of individual orientations by EBSP or the macroscopic texture measurement show a single austenite orientation (although with a non-negligible dispersion around the average orientation and a limited number of ferrite orientations compatible with the variants of the Kurdjumov-Sachs orientation relationship.

    Se ha estudiado un fragmento del hierro meteorítico Gibeon (Namibia, 1847, con estructura de octaedrita fina, combinando técnicas de microscopía óptica, microscopía electrónica de barrido, análisis EDX, medida de orientaciones cristalográficas mediante EBSP (Electron Back Scattered Patterns y difracción de rayos X. La muestra (aprox. 24x23x3 mm, 14.3 g presenta la clásica estructura de Widmanstätten, producto de la intersección de placas lenticulares de ferrita (kamacita, orientadas según planos octaédricos, con la sección metalográfica de la muestra. Se observan también una fracción residual de austenita (taenita retenida entre las placas ferríticas y estructuras más complejas (plesita, producto de la descomposición extraterrestre de la última fracción de austenita. La muestra

  12. Produtos naturais no comportamento defensivo de Apis mellifera L. = Natural products in the defensive behaviour of Apis mellifera L.

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    Renata Leonardo Lomele

    2010-07-01

    Full Text Available Os objetivos do estudo foram investigar a influência de produtos naturais como capim-limão (Cymbopogon citratus, folhas de abacateiro (Persea americana, casca de café (Coffea arabica e sementes de mamona (Ricinus communis na defensividade de Apis mellifera, e avaliar o efeito destes produtos no desenvolvimento populacional da colmeia. O comportamento defensivo foi avaliado por meio do tempo da primeira ferroada (TPF, número de ferrões (NFB e, o desenvolvimento populacional, pela área de cria aberta e fechada. Observou-se que o tratamento fumaça + sete sementes de mamona apresentou aumento significativo no TPF, em relação ao tratamento sem e com fumaça de maravalha. Com relação ao NFB, verificou-se que os tratamentos fumaça de maravalha + sete sementes de mamona e fumaça de maravalha + 20% de folhas de café foram diferentes do tratamento sem e com fumaça. Os demais tratamentos não diferiram significativamente em relação ao uso da fumaça ou sua ausência. A casca de café e a semente de mamona nãointerferiram no desenvolvimento populacional, sugerindo que estes compostos não foram tóxicos. Pode-se concluir que o uso de sementes de mamona e casca de café na fumaça pode representar importante ferramenta para a redução da defensividade, sem promover toxicidade para A. mellifera.The goal was to investigate the influence of natural products such as lemongrass (Cymbopogon citratus, dried avocado leaves (Persea americana, coffee husk (Coffea arabica and castor bean (Ricinus communis in the defense of Apis mellifera, as well the effect of these products on the population development of the beehive. Defensive behavior was evaluated by time of first sting (TFS and number of stingers (NS, and population development, by open brood area and operculated brood. It was observed that the treatment with smoke + seven castor beans presented significant increase in the TFS, for treatment without and with smoke. Regarding NS, it was verified

  13. Ground Albedo Neutron Sensing (GANS) for Measurement of Integral Soil Water Content at the Small Catchment Scale

    Science.gov (United States)

    Rivera Villarreyes, C.; Baroni, G.; Oswald, S. E.

    2012-12-01

    to precipitation events through summer and autumn, but soil water content estimations were affected by water stored in snow and partly biomass. Thus, when calibration parameters were transferred to different crops (e.g. from sunflower to rye), the changes in biomass water will have to be considered. Finally, these results imply that GANS measurements can be a reliable ground-truthing possibility as well as additional constraint for hydrological models. References (1) Rivera Villarreyes, C.A., Baroni, G., and Oswald, S.E. (2011): Integral quantification of seasonal soil moisture changes in farmland by cosmic-ray neutrons, Hydrol. Earth Syst. Sci., 15, 3843-3859. (2) Rivera Villarreyes, C.A., Baroni, G., and Oswald, S.E. (2012): Evaluation of the Ground Albedo Neutron Sensing (GANS) method for soil moisture estimations in different crop fields (in preparation for Hydrological Processes). (3) Zreda, M., Shuttleworth, W.J., Zeng, X., Zweck, C., Desilets, D., Franz, T., Rosolem, R., and Ferre, T.P.A. (2012): COSMOS: The COsmic-ray Soil Moisture Observing System. Hydrol. Earth Syst. Sci. Discuss., 9, 4505-4551.

  14. Produtos naturais no comportamento defensivo de Apis mellifera L. - doi: 10.4025/actascianimsci.v32i3.8486 Natural products in the defensive behaviour of Apis mellifera L. - doi: 10.4025/actascianimsci.v32i3.8486

    Directory of Open Access Journals (Sweden)

    Silvia Maria Alves Gomes

    2010-09-01

    Full Text Available Os objetivos do estudo foram investigar a influência de produtos naturais como capim-limão (Cymbopogon citratus, folhas de abacateiro (Persea americana, casca de café (Coffea arabica e sementes de mamona (Ricinus communis na defensividade de Apis mellifera, e avaliar o efeito destes produtos no desenvolvimento populacional da colmeia. O comportamento defensivo foi avaliado por meio do tempo da primeira ferroada (TPF, número de ferrões (NFB e, o desenvolvimento populacional, pela área de cria aberta e fechada. Observou-se que o tratamento fumaça + sete sementes de mamona apresentou aumento significativo no TPF, em relação ao tratamento sem e com fumaça de maravalha. Com relação ao NFB, verificou-se que os tratamentos fumaça de maravalha + sete sementes de mamona e fumaça de maravalha + 20% de folhas de café foram diferentes do tratamento sem e com fumaça. Os demais tratamentos não diferiram significativamente em relação ao uso da fumaça ou sua ausência. A casca de café e a semente de mamona não interferiram no desenvolvimento populacional, sugerindo que estes compostos não foram tóxicos. Pode-se concluir que o uso de sementes de mamona e casca de café na fumaça pode representar importante ferramenta para a redução da defensividade, sem promover toxicidade para A. mellifera.The goal was to investigate the influence of natural products such as lemongrass (Cymbopogon citratus, dried avocado leaves (Persea americana, coffee husk (Coffea arabica and castor bean (Ricinus communis in the defense of Apis mellifera, as well the effect of these products on the population development of the beehive. Defensive behavior was evaluated by time of first sting (TFS and number of stingers (NS, and population development, by open brood area and operculated brood. It was observed that the treatment with smoke + seven castor beans presented significant increase in the TFS, for treatment without and with smoke. Regarding NS, it was

  15. Metronomic treatment of advanced non-small-cell lung cancer with daily oral vinorelbine – a Phase I trial

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    Guetz S

    2017-02-01

    Full Text Available Sylvia Guetz,1,* Amanda Tufman,2,* Joachim von Pawel,3 Achim Rittmeyer,4 Astrid Borgmeier,2 Pierre Ferré,5 Birgit Edlich,6 Rudolf Maria Huber2 1Ev. Diakonissenkrankenhaus Leipzig, Leipzig, 2University Hospital Munich and Thoracic Oncology Centre Munich, Member of the German Center for Lung Research, Comprehensive Pneumology Center Munich (DZL CPC-M, Munich, 3Asklepios Fachkliniken Muenchen-Gauting, Gauting, 4Lungenfachklinik Immenhausen, Immenhausen, Germany; 5Pierre Fabre Pharmaceuticals, Oncology Research and Development Center, Toulouse, France; 6Pierre Fabre Pharma GmbH, Freiburg, Germany *These authors contributed equally to this work Micro-abstract: In a Phase I dose-finding study of metronomic daily oral vinorelbine in advanced non-small-cell lung cancer, a recommended dose was established for this therapeutic approach. In addition, this trial revealed promising efficacy data and an acceptable tolerability profile. The observed vinorelbine blood concentrations suggest continuous anti-angiogenic coverage. Introduction: We present a Phase I dose-finding study investigating metronomic daily oral vinorelbine (Navelbine® Oral, NVBo in advanced non-small-cell lung cancer (NSCLC. Patients and methods: Patients with stage III/IV NSCLC received daily NVBo at fixed dose levels of 20–50 mg/d for 21 days of each 4-week cycle. Primary end point was the maximum tolerated dose. Secondary end points included tumor response, time to progression (TTP, overall survival (OS and tolerability. Results: Twenty-seven patients with advanced NSCLC were enrolled. Most of them were extensively pretreated. Daily NVBo was well tolerated up to 30 mg/d. At 40 mg/d, two of five patients experienced dose-limiting toxicities (DLTs. Three of six patients had DLTs at the 50 mg/d level. The recommended dose was established at 30 mg/d in cycle 1, with escalation to 40 mg/d in cycle 2, if tolerated. Pharmacokinetic analyses showed continuous blood exposure over 21

  16. Estudo da soldagem de tubos de aço inoxidável duplex e superduplex na posição 5G Study of the welding of duplex and superduplex stainless steel pipes in the 5G position

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    Pedro Ivo Guimarães de Vasconcellos

    2010-09-01

    Full Text Available Os aços inoxidáveis duplex e superduplex possuem uma microestrutura austeno-ferrítica com fração média de cada fase de cerca 50%. A microestrutura duplex é responsável pelas excelentes propriedades mecânicas, especialmente o limite de escoamento e a tenacidade, e pela elevada resistência a corrosão por pites e sob tensão em meios contendo cloretos. A soldagem destes aços é frequentemente uma operação crítica. Neste trabalho, um tubo de superduplex SAF 2207 foi soldado pelo processo TIG (GTAW no passe de raiz e eletrodo revestido (SMAW nos passes de enchimento, e um tubo de duplex SAF 2205 foi todo soldado pelo processo GTAW. A microestrutura do metal base, zona afetada termicamente (ZTA e metal de solda foi caracterizada e quantificada. As propriedades de tenacidade, resistência a corrosão e composição química foram avaliadas e correlacionadas. Os valores de tenacidade ao impacto Charpy-V foram considerados adequados. Não foi observada a precipitação de intermetálicos, carbonetos e nitretos. O melhor resultado no teste de corrosão da junta soldada de aço inox superduplex, comparado ao duplex, foi atribuído ao baixo teor de ferrita delta na solda e ZTA, e composição química da solda enriquecida em Cr, Mo, W e N.The duplex and superduplex stainless steels have an austenitic-ferritic microstructure with an average fraction of each phase of approximately 50%. This duplex microstructure is responsible for the excellent mechanical properties, specially the yield strength and toughness, and for the improved pitting and stress corrosion cracking resistance in chloride environments. Welding of these steels is often a critical operation. In this work, a superduplex stainless steel SAF 2507 pipe was welded by the GTAW process in the root pass and by SMAW process on filler passes, and one pipe of duplex SAF 2205 was entirely welded by the GTAW process. The microstructure of the base metal, heat affected zone (HAZ and weld

  17. A utilização da difração de neutrões na determinação do perfil de tensões residuais em revestimentos por soldadura The use of neutron diffraction for the determination of the in-depth residual stresses profile in weld coatings

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    Maria José Marques

    2013-06-01

    Full Text Available A técnica de difração de neutrões é usada neste artigo para estudar amostras ferríticas, revestidas comaços inoxidáveisausteníticos através de soldadura por arco submerso. Este procedimento é frequentemente usado no fabrico de equipamentos de processo para as indústrias química e nuclear, por facilidade de execução e razões económicas. A principal desvantagem deste processo de revestimento é a fissuração que frequentemente ocorre na interface material base/soldadura, potenciada pela presença de tensões residuais resultantes da operação de soldadura, a qual pode ser minimizada com a realização de tratamentos térmicos de relaxação de tensões. As amostras foram produzidas a partir de placas em aço ao carbono, tendo uma das superfícies sido revestida com dois tipos de aço inoxidável. Para a primeira camada foi usado um elétrodo EN 12072 - S 23 12 2 L e para a segunda e a terceira camadas foi usado um elétrodo EN 12072 - S 19 12 3 L. Após a soldadura, as amostras foram submetidas a um tratamento térmico de relaxação de tensões, durante 1 hora, à temperatura de 620ºC. Os perfis de tensões residuais obtidos por difração de neutrões evidenciam a relaxação de tensões residuais após o tratamento térmico realizado. A técnica de difração de neutrões revelou-se muito adequada na avaliação de tensões residuais neste tipo de ligações.The neutron diffraction is a non-destructive technique, particularly suitable for the analysis of residual stress fields in welds. The technique is used in this article to study ferritic samples, coated by submerged arc welding using stainless steel filler metals. This procedure is often used for manufacturing process equipment for chemical and nuclear industries, for ease of implementation and economic reasons. The main disadvantage of that processes is the cracking phenomenon that often occurs at the interface between the base material and coatings, which can be

  18. Brasagem dos aços inoxidáveis duplex 'baixa liga' UNS S32101, UNS S32304 e superduplex UNS S32750 com metal de adição AWS A5.3 tipo BNi-7 (Ni-Cr-P

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    Dany Michell Andrade Centeno

    2013-12-01

    Full Text Available Os aços inoxidáveis duplex, devido à sua resistência à corrosão, têm uma grande aplicação em diversos segmentos industriais, onde a resistência à corrosão é uma propriedade requerida. Por terem resistência mecânica superior aos aços inoxidáveis ferríticos e austeníticos convencionais, podem produzir equipamentos mais leves. Quando ciclados termicamente, estes aços podem ter suas propriedades alteradas, principalmente quando se emprega processos de junção, como a brasagem, e quando ocorre o desbalanceamento da fração volumétrica ferrita/austenita. O objetivo deste trabalho é caracterizar a brasagem de aços inoxidáveis duplex 'baixa liga' e superduplex, verificando o efeito da folga e do tempo de brasagem na formação de intermetálicos contínuos no interior da junta brasada. Neste trabalho foram brasados, em forno continuo com atmosfera de hidrogênio, corpos-de-prova de aço inoxidável duplex UNS S32101, UNS S32304 e UNS S32750 com a adição para brasagem BNi-7 (Ni-Cr-P, na temperatura de 1100ºC, por tempos de 12 min e 32 min, utilizando-se folgas das juntas de 0,0 e 0,3 mm, seguidos de resfriamento em forno. Os corpos de prova foram caracterizados utilizando-se microscópio óptico, microscópio eletrônico de varredura com EDS e difração de raios X. Os resultados mostraram que a melhor condição para a brasagem em forno empregado foi a brasagem com a folga de 0,0 mm. Ambas as folgas apresentaram microestruturas variadas, porém a folga de 0,0 mm mostrou a presença de uma fase contínua CFC (cúbica de face centrada, rica em níquel, que é denominada, frequentemente, de γ-Ni. Para folgas de 0,3 mm, forma-se uma região eutética contínua no centro da junta, que pode prejudicar as propriedades mecânicas da mesma. Esta região é composta de fases intermetálicas ricas em fósforo. Foram observadas precipitações de fase sigma no metal de base no AID UNS S35750, nas condições de brasagem estudadas.

  19. El ferrocarril mantiene su protagonismo en la evolución urbana de Madrid: el Pasillo Verde y la operación Chamartín

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    González Yanci, María Pilar

    2012-12-01

    últimos años. [fr] Le chemin de fer a été un élément clé pour le développement de Madrid. Grâce à lui, la ville a pu sortir de son isolement dans le centre d’un pays sans voies navigables et avec un réseau routier très précaire. Il a servi à impulser l’activité industrielle, surgie une fois que les matières premières ont pu être transportées facilement. Il a été également à l’origine de l’emplacement de cette activité, liée dans l’espace aux gares et aux voies ferrées. Le chemin de fer a toujours exercé une influence sur la configuration de la structure urbaine, étant clé lors la réalisation du premier plan d’expansion urbaine moderne. Les gares ont influencé leur environnement à travers la création de quartiers marqués par l’activité ferroviaire, attirant d’autres activités, transformant l’aménagement urbain, encourageant la croissance dans certains cas et la ralentissant en d’autres ; elles ont créé dans la ville des espaces de relation et d’activité, et leur transformation ou leur disparition a donné lieu à la création de nouveaux espaces urbains d’un grand intérêt, avec un certain nombre d’initiatives urbanistiques sans précédents ces dernières années.

  20. Steam oxidation of ferritic steels: kinetics and microestructure

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    Aríztegui, A.

    2000-06-01

    Full Text Available The ferritic 2.25Cr–1Mo steel has been subjected to isothermal and non-isothermal oxidation treatments in water steam at several temperatures ranging from 550 to 700 °C for up to 56 days. Under isothermal conditions this steel follows a parabolic oxidation kinetics, with an activation energy of 324 kJ mol–1. This value corresponds to an apparent activation energy for the global process, which includes both outward diffusion of Fe cations and inward diffusion of oxygen. The oxidation products present in the oxide scales, which were characterised by X-ray diffraction and SEM, are in total agreement with the Fe-O phase diagram. Thus, magnetite is the most stable oxide at low temperatures and wustite starts to form above 570 °C. Further studies of the effect of cooling rate have shown that wustite formed at 700 °C transforms into magnetite during a slow cooling, whereas a rapid cooling inhibits this transformation to a certain extent. For non-isothermal oxidation treatments consisting of a holding period at 550 °C followed by a single or double 4 hours exposure at 700 °C, the oxidation process seems to occur in sequence, thus presenting an additive effect of the oxidation treatments carried out at each temperature. This effect was observed both, for the type of oxide grown, and for the kinetics of the process. Microscopic observations of the oxide scales formed after the various oxidation treatments revealed that the oxide scales are constituted by sublayers of distinct microstructure and chemical composition changing from their surface to the substrate interface.

    Se han realizado tratamientos de oxidación isotermos y no isotermos a un acero ferrítico 2,25Cr–1Mo en vapor de agua, a temperaturas comprendidas entre 550 y 700 °C y tiempos de hasta 56 días. En condiciones isotermas, este acero tiene una cinética de oxidación parabólica, con una energía de activación de 324 kJ mol–1. Este valor corresponde a una energía de

  1. Variação sazonal das condições internas de colônias de Melipona marginata obscurior Moure, no Rio Grande do Sul, Brasil Seasonal variations in the internal condictions of colonies the Melipona marginata obscurior Moure, at Rio Grande do Sul, Brazil

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    Francine Von B. Borges

    2006-09-01

    Full Text Available O conhecimento das condições internas das colônias de Melipona marginata obscurior Moure, 1971, ao longo do ano, é importante para a compreensão do comportamento das abelhas sem ferrão e seu manejo. Visa-se o estudo da biologia de M. marginata obscurior em ambiente natural, com ênfase na variação sazonal das condições internas das colônias. Quatro colônias foram estudadas no Centro de Pesquisas e Conservação da Natureza Pró-Mata, em São Francisco de Paula, RS. Avaliou-se o volume dos ninhos, a ocorrência e duração da diapausa e o número total de favos e de células de cria nos dois últimos favos. O volume do invólucro inicial das quatro colônias foi semelhante, variando de 2,26 a 2,69 litros. Ao final da avaliação observou-se que o volume do invólucro da colônia A reduziu 5%, enquanto as demais cresceram 61% (colônia B, 84% (C e 71% (D. A partir do monitoramento mensal dos favos de cria constatou-se a ocorrência de diapausa em três colônias (B, C e D enquanto a colônia A permaneceu com postura ininterruptamente. As colônias cessaram a construção de células de cria e postura da rainha durante o outono e reiniciaram esta atividade no final do inverno. Sugere-se que a variação do período de diapausa (8 a 23 semanas seja determinada por fatores internos das colônias. O número máximo de favos registrado durante a primavera e o verão variou de 6 a 8, enquanto que o número estimado de células de cria dos dois últimos favos variou de 116 a 1190. Foi possível reconhecer padrões, bem como variações sazonais, relacionados ao volume do invólucro dos ninhos, à ocorrência de diapausa e ao número de favos e de células de cria nos dois últimos favos. Variações sazonais das condições internas entre as colônias mostraram-se evidentes e podem ser creditadas a características intrínsecas das colônias.The knowledge of the internal conditions of Melipona marginata obscurior Moure, 1971 colonies, through

  2. Notas sobre a bionomia de Tetragonisca weyrauchi schwarz, 1943 (Apidae, MeliponinI Notes on the bionomy of The stingless bee Tetragonisca weyrauchi Schwarz, 1943 (Apidae, Meliponini

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    Marilda Cortopassi-Laurino

    2003-12-01

    Full Text Available No Brasil, a abelha sem ferrão, Tetragonisca weyrauchi tem sua distribuição restrita à região Amazônica. Constrói ninhos aéreos freqüentemente em forquilhas inclinadas de árvores. Os ninhos, cilindróides e verticais, medem cerca de 60cm de circunferência na parte mais larga e 35cm de altura. A cobertura é de uma película fina e maleável com diferentes consistências. A maioria dos ninhos apresenta, na parte superior, um prolongamento com várias protuberâncias e aberturas, ou só aberturas, com diâmetros milimétricos variáveis ao longo do dia, denominado aqui de respiráculo. A morfologia do ninho, com a porta na parte inferior e o respiráculo na parte superior, parece estar bem adaptado ao ambiente tropical em que se encontra. As médias das temperaturas internas de um ninho habitado e outro vazio acompanharam as flutuações ambientais com alto valor de correlação (r=0,98. Os resultados sugerem que a estrutura física do ninho seria responsável por uma pequena parcela na retenção da energia calorífera. Se existe termorregulação, ela deve ser mais evidente acima dos 33ºC ambientais, temperatura onde ocorreu tendência de estabilidade. A grande quantidade de lamelas de cerume ao redor dos favos de cria horizontais, o tamanho dos potes ovóides de alimento ao redor de 1-2 cm de altura, a porcentagem de água no mel ao redor de 27.6%, o aspecto do tubo de entrada com pequenos orifícios, os valores de temperatura em que ocorre a abertura desse tubo pela manhã, entre 21-23ºC, e as coletas de néctar, predominantemente em Myrtacea, fazem com que seja atribuída grande semelhança física e comportamental entre T.weyrauchi e T. angustula. Os ninhos se adaptam bem em colônias tipo Paulo Nogueira-Neto. São abelhas agressivas quando manuseadas. Estima-se que seus ninhos tenham uma população de 2000-3000 indivíduos.In Brazil, the stingless bee Tetragonisca weyrauchi has its distribution restricted to the Amazonian

  3. Book Reviews

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    Redactie KITLV

    2001-07-01

    , Claudette M. Williams, Charcoal and cinnamon: The politics of color in Spanish Caribbean literature. Gainesville: University Press of Florida, 2000. xii + 174 pp. -Nicole Roberts, Marie Ramos Rosado, La mujer negra en la literatura puertorriqueña: Cuentística de los setenta: (Luis Rafael Sánchez, Carmelo Rodríguez Torres, Rosario Ferré y Ana Lydia Vega. San Juan: Ed. de la Universidad de Puerto Rico, Ed. Cultural, and Instituto de Cultura Puertorriqueña, 1999. xxiv + 397 pp. -William W. Megenney, John H. McWhorter, The missing Spanish Creoles: Recovering the birth of plantation contact languages. Berkeley: University of California Press, 2000. xi + 281 pp. -Robert Chaudenson, Chris Corne, From French to Creole: The development of New Vernaculars in the French colonial world. London: University of Westminster Press, 1999. x + 263 pp.

  4. Editorial L&E, v.8, n.3, 2014

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    Rede Conpadre

    2014-09-01

    “Ambiens”. O sistema otimiza sensivelmente os processos de gestão de resíduos e o controle das variáveis tempo e custo. Os autores apresentam uma aplicação do software no Grupo Empresarial do Ministério da Construção na província de Granma em Cuba, incluindo outras empresas que este agente assessora e controla. O resultado permite concluir que o software está pronto para ser empregado em qualquer SGR, sendo adaptável a todo tipo de resíduo gerado, o que permite seu uso em qualquer indústria ou empresa. Os autores Ranulfo Paiva Sobrinho e Ademar Ribeiro Romeiro introduzem com seu artigo o conceito de multimetodologia e apresentam uma aplicação envolvendo a tomada de decisão em sistemas socioecológicos complexos. A aplicação abrange 3 metodologias que combinadas auxiliaram os decisores a avaliarem o impacto de uma política envolvendo moedas complementares para incentivo a pequenos agricultores da Amazônia, particularmente em Machadinho d’Oeste, a revegetarem suas propriedades. A Rede Conpadre orgulha-se de mais este número da Revista Labor & Engenho, integrando autores de países que comumente publicam neste Periódico (como o Brasil e a Argentina, com autores de países que pela primeira vez publicam nesta rede (como a França e Cuba. Assim, certamente se fortalece a prespectiva que move a Rede Conpadre no sentido de abranger cada vez mais pesquisadores e instituições de pesquisa de diferentes países que se interessem por questões essenciais vinculadas ao binômio “Paisagem & Engenharia”, conectando Patrimônio e Desenvolvimento Regional. Esperamos que este número se confirme como excelente material de consulta. Tenham todos uma ótima leitura. André Munhoz de Argollo Ferrão Universidade Estadual de Campinas Rede Conpadre

  5. PREFACE: Domain wall dynamics in nanostructures Domain wall dynamics in nanostructures

    Science.gov (United States)

    Marrows, C. H.; Meier, G.

    2012-01-01

    spin-transfer torque threshold current density in coupled vortex domain wallsS Lepadatu, A P Mihai, J S Claydon, F Maccherozzi, S S Dhesi, C J Kinane, S Langridge and C H Marrows Large RF susceptibility of transverse domain wallsO Rousseau, S Petit-Watelot and M Viret Expansion and relaxation of magnetic mirror domains in a Pt/Co/Pt/Co/Pt multilayer with antiferromagnetic interlayer couplingP J Metaxas, R L Stamps, J-P Jamet, J Ferré, V Baltz and B Rodmacq Current-induced domain wall motion and magnetization dynamics in CoFeB/Cu/Co nanostripesV Uhlíř, J Vogel, N Rougemaille, O Fruchart, Z Ishaque, V Cros, J Camarero, J C Cezar, F Sirotti and S Pizzini Roles of the magnetic field and electric current in thermally activated domain wall motion in a submicrometer magnetic strip with perpendicular magnetic anisotropySatoru Emori and Geoffrey S D Beach Electrical domain morphologies in compositionally graded ferroelectric filmsM B Okatan, A L Roytburd, V Nagarajan and S P Alpay Domain-wall pinning by local control of anisotropy in Pt/Co/Pt strips J H Franken, M Hoeijmakers, R Lavrijsen and H J M Swagten Experimental detection of domain wall propagation above the Walker field Kouta Kondou, Norikazu Ohshima, Daichi Chiba, Shinya Kasai, Kensuke Kobayashi and Teruo Ono Enhanced functionality in magnonics by domain walls and inhomogeneous spin configurationsG Duerr, R Huber and D Grundler Domain wall motion in perpendicular anisotropy nanowires with edge roughness Maximilian Albert, Matteo Franchin, Thomas Fischbacher, Guido Meier and Hans Fangohr Determination of the spin torque non-adiabaticity in perpendicularly magnetized nanowiresJ Heinen, D Hinzke, O Boulle, G Malinowski, H J M Swagten, B Koopmans, C Ulysse, G Faini, B Ocker, J Wrona and M Kläui Domain wall dynamics driven by spin transfer torque and the spin-orbit field Masamitsu Hayashi, Yoshinobu Nakatani, Shunsuke Fukami, Michihiko Yamanouchi, Seiji Mitani and Hideo Ohno Dynamic propagation and nucleation in domain

  6. Selected Abstracts of the 13th International Workshop on Neonatology; Cagliari (Italy; October 25th-28th, 2017

    Directory of Open Access Journals (Sweden)

    --- Various Authors

    2017-10-01

    , G. OttonelloABS 21. METABOLOMICS OF HUMAN BREAST MILK: PRELIMINARY RESULTS ON THE IM­POR­TANCE OF SECRETOR PHE­NO­TYPE • G. Pruneddu, F. Cesare Marincola, D.D. Briana, S. Gavrili, S. Georgantzi, A. Dessì, S. Corbu, A. Noto, R. Pintus, V. Fanos, A. Malamitsi-PuchnerABS 22. LONGITUDINAL WEIGHT GAIN FROM BIRTH TO 18-24 MONTHS CORRECTED AGE IN 66 EXTREMELY LOW GESTATIONAL AGE NEW­BORNS (ELGANs WITH AND WITHOUT BRON­CHO­PULMONARY DYSPLASIA • V. Masile, D. Manus, M. Puddu, G. Palmas, M.A. Marcialis, F. Bardanzellu, V. Fanos, M.C. PintusABS 23. A CASE OF SUCCESSFUL PROPRANOLOL TREATMENT OF NEONATAL HEPATIC HE­MAN­GIOMATOSIS • F. Bardanzellu, P. Neroni, C. Ferreli, C. Porcu, E. Longobardi, M.E. Trudu, V. Fanos, G. OttonelloABS 24. NEONATAL ANTHROPOMETRIC CHARTS FOR TWINS BORN IN ITALY: UPDATE AND COM­PARISON • S. Vai, L. De SanctisABS 25. BLADDER EXSTROPHY: RECOGNITION AND MANAGEMENT OF A RARE DISEASE • F. Mecarini, C. Fanni, G. OttonelloABS 26. AMBIGUOUS GENITALIA IN NEWBORN: A CASE REPORT • C. Loddo, C. Fanni, E. Curridori, M. Balzarini, V. Marinelli, A. RealiABS 27. PEDIATRIC HEADACHE: SIMPLE OR SIMPLY DIFFICULT TO MANAGE? • M.S. Cosentino, V. Del Volgo, C. Distefano, M. Soliani, L. Bonetti, F. Comes, R. Delmiglio, A.E. Scaramuzza, G. Piccini, L. Bianchini, M. Sessa, C. Cavalli, S. EspositoABS 28. SUBCUTANEUS FAT NECROSIS AND HY­PER­CALCEMIA: A CLINICAL CASE • M. VendemmiaABS 29. PHENOTYPIC DISCORDANCE IN DIGEORGE MONOZYGOTIC TWINS • F. Guerra, M. Rossano, G. di Pietro, E. Flore, M. Balzarini, M. Marica, P. MoiABS 30. FETAL MAGNETIC RESONANCE PARAMETERS IN INTRAUTERIN GROWTH RESTRICTION • S. Perrone, M.G. Alagna, A. Santacroce, I. Paternò, S.F. Carbone, G. BuonocoreABS 31. DRY LUNG SYNDROME AND SEVERE BRON­CHOPULMONARY DYSPLASIA WITH FATAL OUTCOME IN TWO PRETERMS OF 29 WEEK’S GESTATION • C. Fanni, C. Loddo, F. Mecarini, M.C. PintusABS 32. FETAL MAGNETIC RESONANCE IMAGING AP­PLICATIONS IN GASTROINTESTINAL CON

  7. Editorial L&E, v.9, n.3, 2015

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    Rede Conpadre

    2015-09-01

    intitulado Políticas e práticas de gestão de pessoas e suas relações com o absenteísmo: desafios ao desenvolvimento sustentável — de Marlette Cassia Oliveira Ferreira; Jussara Goulart da Silva; Flavio Santino Bizarrias; Juliana Barros Carvalho; Fernanda Maria S. Souza; Maurício Hirata França; Marli de Souza Gonçalves (Universidade Nove de Julho — em que os autores se propõem a analisar as relações entre as políticas e práticas de gestão de pessoas, o senso de justiça e o absenteísmo na área da produção, em um cenário de constante busca de maior qualidade de vida, a partir de um amplo levantamento de dados primários através de Survey aplicados a 90 colaboradores da área de produção numa empresa de médio porte na cidade de São Paulo, submetidos a uma modelagem de equações estruturais. Um trabalho interessante por tratar de aspectos presentes na maioria das empresas brasileiras de médio porte. Tenham todos uma boa leitura.   André Munhoz de Argollo Ferrão Universidade Estadual de Campinas / Rede Conpadre — Brasil

  8. Shrublands and Soil Erosion. An State-of-the-Art

    Science.gov (United States)

    García Estríngana, Pablo; Dunkerley, David; Cerdà, Artemi

    2014-05-01

    . L.F. (Eds.) Terrestrial Ecosystems in a Changing World, Global Change - The IGBP Series, pp. 247-259. Romero Díaz, A. 2003 Influencia de la litología en las consecuencias del abandono de tierras de cultivo en medio Mediterráneos semiáridos. Papeles de Geografía 38, 151-165. Romero Díaz, A., Belmonte Serrato, F., Ruiz-Sinoga, J.D. 2010. The geomorphic impact of afforestations on soil erosion in Southeast Spain. Land Degradation and Development 21, 188-195.Rowell, 2005 Ruiz Sinoga, J.D., Romero Díaz, A., Ferre Bueno, E., Martínez Murillo, J.F. 2010. The role of soil surface conditions in regulating runoff and erosion processes on a metamorphic hillslope (Southern Spain). Soil surface conditions, runoff and erosion in Southern Spain. Catena 80, 131-139. Tomaselli, R. 1981. Main physiognomic types and geographic distribution of shrub systems related to Mediterranean climates. In: di Castri, F., Goodall, D.W., Specht, R. (Eds.), Ecosystems of the world: Mediterranean-type shrublands. Elsevier, Amsterdam, Netherlands, pp. 95-106. UNEP. 1991. Status of Desertification and Implementation of the United Nations Plan of Action to Combat Desertification. United Nations Environment Programme (UNEP). Nairobi. Zhao, G., Mu, X., Wen, Z., Wang, F., and Gao, P. 2013. Soil erosion, conservation, and Eco-environment changes in the Loess Plateau of China. Land Degradation & Development, 24: 499- 510. DOI 10.1002/ldr.2246 Ziadat, F. M., and Taimeh, A. Y. 2013. Effect of rainfall intensity, slope and land use and antecedent soil moisture on soil erosion in an arid environment. Land Degradation & Development, 24: 582- 590. DOI 10.1002/ldr.2239

  9. Realidades amazónicas: navegaçao interna e transcontinental sulamericana

    Directory of Open Access Journals (Sweden)

    1973-01-01

    ramifications intérieures qui, telles un réseau ferré parfaitement établi, permettent de pénétrer profondément cet intérieur immense a partir de quatre sorties sur l'océan. La sixième partie se réfère a une frange 'océanique' intérieure de 1500 Km de profondeur qui, à partir des voies d'eau déjà décrites, pourrait constituer une zone de grand développement pour l'intérieur de l'Amérique latine, abandonné a cause de son éloignement de la cote. Ainsi, le développement qui se poursuit le long de l'Atlantique, du Pacifique et du littoral caraïbe pourrait pénétrer a l'intérieur du continent. L'A. montre également combien les voies d'eau existantes, après élimination de certains obstacles, seraient un facteur naturel d'intégration pour tout l'intérieur dont la plus grande partie est constituée par l'Amazonie. Cette conclusion constitue une introduction anticipée pour la suite de cette étude éventuellement publiée dans ce Bulletin. Dans cette étude, l'A. insiste sur l'aspect énergétique, complément de l'aspect navigation qui en constitue souvent un sous-produit, d'autant plus que la rareté des ressources énergétiques devient tous les jours plus aiguë alors que les réserves hydroélectriques des rivières sud-américaines restent peu ou pas exploitées. In the first part of this FIRST STUDY OF THE AMAZON, called 'SOUTH AMERICAN INTERNAL AND TRANSCONTINENTAL NAVIGATION' - which by obvious reasons is not limited to the watershed of the Amazon, but also includes the neighboring rivers - we detail the causes which led us to its elaboration, i.e. the great gift of Nature to present the South American Continent a potamographic abundance without equal in the world as well as its present state of non utilization. We demonstrate with technical data the great advantages of water transport - the most economic of all transports - and that this type of transport has not become obsolete by the modern road transport, as a tendentious propaganda wants to

  10. Programa de Pós-Graduação em Geologia - Dissertações Defendidas 1999 - Mestrado - Instituto de Geociências - Universidade Federal do Rio de Janeiro

    Directory of Open Access Journals (Sweden)

    1999-01-01

    é então conhecidas. Os taxa identificados são concordantes com a idéia vigente de que as condições climáticas, ambientais e ecológicas eram diferentes dos atualmente reinantes no nordeste brasileiro durante o Pleistoceno final sub-recente, quando prevalecia um ambiente semi-árido mais ameno. Nome: Francisco Crescêncio Júnior Orientador: Claudio Gerhiem Porto Título: Estudomorfológico e Químico dos Grãos de Ouro do Minério Oxidado da Mina de Roça Grande Ii, Mg Resumo: A partir do final da década de 70 e nos anos 80, graças ao aumento do preço do ouro, intensificaram-se as pesquisas relacionadas ao comportamento deste metal em ambientes supergênicos. Várias pesquisas se desenvolveram na Austrália, África e Brasil, voltadas, principalmente, para os depósitos supergênicos lateríticos, onde se verificou que o ouro pode sofrer remobilização, através de processos químicos e físicos. A área do presente estudo, Mina de Roça Grande II, situa-se no Quadrilátero Ferrífero, MG. O depósito encaixa-se nos metassedimentos químicos do Grupo Nova Lima. Tanto o estudo da morfologia dos grãos de ouro com auxílio de lupa binocular e microscópio eletrônico de varredura (MEV acoplado a um analisador de imagem quanto da composição química destes grãos com auxílio da microssonda eletrônica, visou elucidar a atuação de tais processos. Na zona oxidada da mina foram estudados os níveis de saprock e saprolito na formação ferrífera e no metachert, além de um nível de solo coluvionar. Estes horizontes caracterizam um perfil intempérico típico de regiões de altitudes elevadas e de natureza supergênica não-laterítica. O estudo da morfologia dos grãos de ouro revelou que os grãos do solo tendem a ser mais regulares, lisos e arredondados, demonstrando maior desgaste em relação aos grãos encontrados nos outros horizontes. O analisador de imagem, apesar de diferenciar grãos regulares e irregulares, confirmando as observações de lupa

  11. Programa de Pós-Graduação em Geologia - 2003 - Teses Defendidas - Doutorado - Instituto de Geociências, UFRJ

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    2003-01-01

    distribuem-se em duas categorias: 1 pegmatitos simples, homogêneos, formados dentro dos granitóides parentais, e 2 pegmatitos complexos ou de profundidade intermediária, formados fora dos corpos granitóides parentais, que apresentam uma mineralogia acessória ampla, com minerais de metais raros, e outros que atestam a ocorrência de metassomatismo no seu processo final de formação. A pegmatitogênese da região se deu em um período que varia entre 160 e 200 Ma, a partir da colocação da Suíte Rio Negro (640 a 600 Ma até o Ordoviciano Médio. Sob o ponto de vista tectônico, toda a área de trabalho pode ser dividida em dois blocos crustais. O Bloco Serra dos Órgãos, que sofreu uma anatexia crustal ampla e dentro do qual se situam os corpos magmáticos brasilianos; é considerado a Zona Central do Orógeno Brasiliano. O Bloco de Cabo Frio, considerado como a Zona Marginal do mesmo orógeno, é destituído de granitóides brasilianos, e expõe em vastas áreas o embasamento Paleoproterozóico, com suas estruturas pré-brasilianas preservadas na orla litorânea. Contém raros pegmatitos, do tipo simples, que ocorrem isoladamente, formados pela anatexia local das encaixantes. Pela interpretação de todos os dados 187 Anuário do Instituto de Geociências - UFRJ Volume 26 / 2003 disponíveis, os dois blocos tiveram uma evolução em comum, mas se diferenciam sobretudo pelo grau de anatexia que teriam sofrido durante a Orogênse Brasiliana e pela conseqüente ausência de granitogênese no Bloco de Cabo Frio. O Bloco Serra dos Órgãos foi aquele onde os processos de transformação crustal se deram de forma mais intensa. Autor: Diniz Tamantini Ribeiro Orientador: Fernando Roberto Mendes Pires Título: Enriquecimento supergênico de formações ferríferas bandadas: estruturas de colapso e desordem - 123 p. Resumo Processos supergênicos em Formações Ferríferas Bandadas (FFB atuam segundo importante dissolução, transporte de material e simultânea desordem das

  12. Selected Abstracts of the 11th International Workshop on Neonatology; Cagliari (Italy; October 26-31, 2015

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    --- Various Authors

    2015-10-01

    aggression: metabolomics • A. Noto, V. Fanos • Cagliari (Italy ABS 85. SOX 2-immunostaining allows the identification and location of neural stem progenitors in the developing human hippocampus • M. Piras, G. Naccarato, V. Pibiri, A. Ravarino, M.A. Marcialis, L. Vinci, D. Fanni, P. Van Eyken, C. Gerosa • Cagliari and Pisa (Italy, Leuven (Belgium ABS 86. Stem progenitor cells in the liver • F. Lai, C. Gerosa, M.R. Aprile, Y. Gibo, P. Van Eyken, D. Fanni • Cagliari and Ravenna (Italy, Matzumoto (Japan, Genk (Belgium ABS 87. Sacrococcygeal teratoma and the secrets of stem/progenitor cells • C. Gerosa, S. Nati, G. Locci, E. Obinu, M.R. Aprile, D. Fanni • Cagliari and Ravenna (Italy ABS 88. Nutrimetabolomics in IUGR and LGA newborns • V. Fanos, A. Dessì • Cagliari (Italy ABS 89. Fetal programming and renal damage: new perspectives? • E. Gintoli, P. Cirillo, L. Gesualdo • Bari (Italy ABS 90. The paediatric parent’s association and “the care”: the three-year program of “Associazione Amici Bambini Cardiopatici Sardi” 2015-2017 • L. Scarpa, P. Neroni, G. Ottonello, S. Floris, M. Zonza • Cagliari (Italy ABS 91. Clinical risk in neonatology: how to prevent it in daily practice? • F. Mosca, G. Cavallaro • Milan (Italy ABS 92. Drug-induced metabolic profile changes in preterm infants • F. Bazzini, M. Longini, M.L. Tataranno, S. Perrone, I. Sirgiovanni, S. Negro, M. Calderisi, A. Vivi, M. Tassini, M. Fumagalli, M.J.N.L. Benders, G. Buonocore • Milan, Pisa and Siena (Italy, Utrecht (the Netherlands, London (UK ABS 93. Usefulness of molecular genetics in the differential diagnosis of melanocytic spitzoid lesion in children • L. Pilloni, G. Fumo, F. Patta, B. Piras, L. Atzori, E.V. De Bonis, V. Piras, A.L. Pinna, C. Ferreli • Cagliari and Florence (Italy ABS 94. Job profiles in the nursery • R. Galaverna • Cuneo (Italy ABS 95. PAX2 and phenotypic expression • C. Grassia, L. Abbate, A. Ansalone, G. Ausanio, I. Bernardo, D. Brescia, A

  13. Programa de Pós-Graduação em Geologia - Teses Defendidas 2000 - Doutorado - Instituto de Geociências - UFRJ

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    2000-01-01

    átero Ferrífero; - 604 +- 19 Ma a 567 +- 11 Ma associado a fácies xisto verde e desenvolvido em diques metabasíticos e nas rochas metassedimentares das Bacias São João del Rei, Carandaí e Andrelândia durante a Orogenia Brasiliana. Após as mudanças associadas ao terceiro evento metamórfico (entre 2.131 +- 4 e 2.121 +- 7 desenvolveram-se novas transformações mineralógicas, representadas principalmente pela substituição de hornblenda magmática e actinolita metamórfica por biotita e de plagioclásio por microclina, que foram interpretadas como relacionadas a um evento metassomático potássico. Essas transformações necessitariam da adição de potássio ao sistema, o qual estaria associado aos corpos pegmatíticos e/ou diques e apófises do Granitóide Ritápolis, cuja idade 207Pb/206 Pb (evaporação de zircão varia entre 2.122 +- 6 e 2.121 +- 7 Ma. Nome: Reneu Rodrigues da Silva Orientador: Claudio Bettini Título: Explorator: protótipo de sistema holístico em exploração de petróleo Resumo: O processo de explorar petróleo pode ser representado por um único sistema computacional que integra os subprocessos de planejamento (geológico e econômico, operações (levantamentos sísmicos e perfuração de poços e controle exploratório (qualidade e desempenho. Para uma empresa de petróleo, um sistema dessa natureza, 39 Anuário do Instituto de Geociências - UFRJ Volume 23 / 2000 de concepção holística, pode melhorar significativamente a qualidade das decisões e por conseguinte aumentar o valor econômico dos resultados exploratórios, porque todas informações pertinentes estão interconectadas e disponíveis no mesmo sistema. Para demonstrar a viabilidade dessa tese, um protótipo, chamado de Explorator, foi desenvolvido em Excel (com a linguagem de programação Visual Basic*, com base no conceito de play petrolífero representado por mapas de fatores geológicos (geração, migração, reservatório, capeadora e geometria de trapa e campos de

  14. Programa de Pós-Graduação em Geologia - Teses Defendidas 1998 - Doutorado - Instituto de Geociências - Universidade Federal do Rio de Janeiro

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    1998-01-01

    amostras moldadas com o plano de ruptura coincidente e perpendicular à xistosidade não mostraram a sua influência na resistência ao cisalhamento. Nome: Marília Inês Mendes Barbosa Título: Complexo Ultramáfico Acamadado Morro das Almas, Região de Bom Sucesso e Ibituruna (MG: Geologia, Magmatismo e Metamorfismo Orientador: Fernando Roberto Mendes Pires Resumo: O Complexo Ultramáfico Acamadado Morro das Almas, incluindo os morros Paraíso e Santa Helena, está situado nos limites dos municípios de Bom Sucesso e 120 Anuário do Instituto de Geociências - UFRJ Volume 21 / 1998 Ibituruna, na região centro-sul do estado de Minas Gerais. É um corpo acamadado de porte médio, originalmente formado por cumulatos a piroxênio (ortopiroxenito, com lentes de dunito e, em menor proporção, faixas de peridotito e olivina ortopiroxenito e horizontes de cromititos. A espessura do Complexo Ultramáfico Acamadado Morro das Almas varia aproximadamente de 2200a 3000m, com comprimento em torno de 8 Km de extensão. O Complexo é atravessado por zona rifteana preenchida por metassedimentos do Supergrupo Minas (itabiritos, quartzitos e itabiritos, constituindo as serras de Bom Sucesso e Ibituruna. Esta estrutura rifteana foi convertida posteriormente em zona de cisalhamento, que corresponde ao prolongamento sudoeste da Falha do Engenho do Quadrilátero Ferrífero. Aparentemente, o complexo representa uma das seqüências plutônicas Arqueana do greenstone belt Barbacena, formado por komatiitos periodíticos a basálticos, localmente com textura spinifex, anfibolitos, quartzitos e formação manganesífera. O greenstone belt é cortado, ainda, por trondhjemitos arqueanos e granitos e pegmatitos transamazônicos. Todas as litologias são seccionadas por enxame de diques máficos proterozóicos e fanerozóicos. O complexo ultrabásico foi submetido à deformação dúctil e rúptil que produziu forte foliação paralela ao trend nordeste e fraturamento ortogonal preenchido por v

  15. Programa de Pós-Graduação em Geologia - Dissertações Defendidas 1998 - Mestrado - Instituto de Geociências - Universidade Federal do Rio de Janeiro

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    1998-01-01

    marcam a deposição pós-deformacional do pegmatito. Nome: Léa Maria de Aguiar de Pedro Título: Geologia e Petrografia de Parte de um Greenstone Belt Contendo Derrames Komatiíticos, a Oeste da Cidade de São João del Rei, Minas Gerais Orientador: Joel Gomes Valença Resumo: Na borda sul do Cráton do São Francisco, uma pequena área de um greenstone belt de idade arqueana, contendo derrames komatiíticos metamorfisados e localmente invadido por corpos metaintrusivos félsicos a máficos, foi investigada geológica e petrograficamente. A área, com aproximadamente 45 Km2, está localizada a 80 Km a sudoeste do Quadrilátero Ferrífero, próxima a cidade de São João del Rei, Minas Gerais. Apesar da falta de bons afloramentos devido ao intemperismo e a cobertura de solo e vegetação, três domínios litológicos podem ser reconhecidos: Domínio Litológico I, consistindo de metabasaltos e prováveis metandesitos, com intrusão de rochas metagabróicas; Domínio Litológico II, investigado com maior ênfase, englobando duas sucessões de rochas supracrustais constituídas por metapelitos intercalados com quartzitos e quartzitos conglomeráticos e metapelitos associados à rochas metaultramáficas e metamáficas xistosas. A leste, estas sucessões estão interdigitadas com e invadidas por parte de um corpo alongado, concordante, de rochas metagraníticas (corpo Brumado de Baixo; Domínio Litológico III, representado por rochas intrusivas metatrondhjemíticas do corpo Caxambú, parcialmente bordejadas por gnaisses bandados com anfibolitos intercalados. As posições estratigráficas relativas desses domínios permanecem, entretanto, desconhecidas na área de estudo. Os domínios supracitados, principalmente os domínios I e II, se dispõem como faixas individuais contínuas, paralelas, de rochas, por aproximadamente 20 Km ao longo da área estudada e de áreas vizinhas, com trend NE-SW. Esta direção é aproximadamente coincidente com a foliação tectônica, e no