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Search Results: 1 - 10 of 20997 matches for " Jefferson Costa;Manno "
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Exigências de treonina digestível para leitoas mantidas em ambiente termoneutro dos 15 aos 30 kg
Saraiva, Edilson Paes;Oliveira, Rita Flávia Miranda de;Donzele, Juarez Lopes;Silva, Francisco Carlos de Oliveira;Siqueira, Jefferson Costa de;Manno, Maria Cristina;Oliveira, Will Pereira de;Nunes, Christiane Garcia Vilela;
Revista Brasileira de Zootecnia , 2007, DOI: 10.1590/S1516-35982007000800019
Abstract: this study was carried out to evaluate the requirements of digestible threonine in diets of gilts from 15 to 30kg, maintained in thermoneutral environment. seventy crossbreed gilts with an initial weight of 15.1 ± 0.4 kg were used in a randomized blocks design, with five treatments (levels of digestible threonine), seven replicates and two animals per experimental unity. the treatments corresponded to the levels of 0.54, 0.58, 0.61, 0.65, e 0.698% of digestible threonine. digestible threonine levels in the diet increased the daily weight gain in a quadratic way up to the level of 0.61% and the feed:gain ratio up to the level of 0.62%. protein and fat deposition rates also increased in a quadratic way reaching maximum value up to the level of 0.61%. a linear effect of the treatments was evidenced on the absolute and relative weights of the intestine. the calculated level of 0.62% of digestible threonine corresponding to a relation with digestible lysine of 67% and a daily intake of 7.11 g, provided better performance of gilts maintained in a thermoneutral environment from 15 to 30 kg.
Níveis de treonina digestível em ra??es para leitoas dos 15 aos 30 kg mantidas em ambiente de alta temperatura
Saraiva, Edilson Paes;Oliveira, Rita Flávia Miranda de;Donzele, Juarez Lopes;Silva, Francisco Carlos de Oliveira;Vaz, Roberta Gomes Mar?al Vieira;Siqueira, Jefferson Costa;Manno, Maria Cristina;Oliveira, Will Pereira de;
Revista Brasileira de Zootecnia , 2006, DOI: 10.1590/S1516-35982006000200021
Abstract: this trial was conducted to evaluate the dietary levels of digestible threonine for growing gilts on heat stress environment. seventy crossbreed gilts averaging initial weight of 14.9 ± 0.56 kg were assigned to a complete randomized blocks design with five treatments (levels of digestible threonine) of seven replications (two animals per experimental unity). the treatments consisted of the following dietary digestible threonine levels: 0.538, 0.577, 0.614, 0.651, and 0.688%. daily weight gain and threonine intake linearly increased as the dietary threonine level increased, whereas daily feed intake was not affected. although feed:gain ratio linearly changed with the treatments, the best dietary digestible threonine level was estimated in 0.587%. daily depositions of protein and fat in the carcass and absolute and relative weights of the evaluated organs were not affected by the treatments. it was concluded that gilts from 15 to 30 kg on heat stress environment require 0.587% of digestible threonine in the diet to obtain better feed:gain ratio, leading to a threonine digestible: digestible lysine ratio of 63%.
On the geometry of Grassmannian equivalent connections
Gianni Manno
Mathematics , 2006,
Abstract: We introduce the equation of n-dimensional totally geodesic submanifolds of a manifold E as a submanifold of the second order jet space of n-dimensional submanifolds of E. Next we study the geometry of n-Grassmannian equivalent connections, that is linear connections without torsion admitting the same equation of n-dimensional totally geodesic submanifolds. We define the n-Grassmannian structure as the equivalence class of such connections, recovering for n=1 the case of theory of projectively equivalent connections. By introducing the equation of parametrized n-dimensional totally geodesic submanifolds as a submanifold of the second order jet space of the trivial bundle on the space of parameters, we discover a relation of covering between the `parametrized' equation and the `unparametrized' one. After having studied symmetries of these equations, we discuss the case in which the space of parameters is equal to R^n.
EFEITO DA APLICA O DE FUNGICIDAS NO SOLO SOBRE A GERMINA O CARPOGêNICA E MICELIOGêNICA DE ESCLERóDIOS DE Sclerotinia sclerotiorum EFFECT OF FUNGICIDE APPLICATION IN THE SOIL ON THE CARPOGENIC AND MYCELIOGENIC GERMINATION OF Sclerotinia sclerotiorum
Gesimária Ribeiro Costa,Jefferson Luis da Silva Costa
Pesquisa Agropecuária Tropical , 2007, DOI: 10.5216/pat.v34i3.2306
Abstract: Os fungicidas benomyl, procymidone, iprodione, vinclozolin, fluazinan e tiofanato metílico foram utilizados para verificar seus efeitos na germina o carpogênica e miceliogênica de escleródios de Sclerotinia sclerotiorum, no solo. O solo coletado foi distribuído em caixas gerbox. Em cada caixa foram colocados 300 g de solo e, posteriormente, foi efetuado o enterrio de 25 escleródios à profundidade de 2,0 cm. Os fungicidas foram aplicados no solo, na dose de 0,5 kg.ha-1 de i.a., simulando uma lamina de água de 6,0 mm. Em geral, o vinclozolin foi o melhor tratamento, apresentando uma eficiência de 100% na inibi o de estipes e apotécios. O fluazinan permitiu apenas a forma o de estipes inviáveis, resultando na ausência de apotécios. Na germina o miceliogênica dos escleródios, observou-se que após quinze dias de incuba o, o tiofanato metílico reduziu em 75% a germina o miceliogênica, seguido dos fungicidas procymidone e vinclozolin, que apresentaram, em média, 60% de inibi o. Os fungicidas benomyl, fluazinan e iprodione foram os menos eficientes na inibi o da germina o miceliogênica dos escleródios, n o diferindo estatisticamente do controle. Após trinta dias de incuba o dos escleródios no solo, os fungicidas procymidone, tiofanato metílico, vinclozolin, iprodione e fluazinam n o diferiram significativamente entre si quanto à inibi o da germina o miceliogênica, mas diferiram do fungicida benomyl e do tratamento testemunha. PALAVRAS-CHAVE: Controle químico; mofo branco; Phaseolus vulgaris. The effects of benomyl, procymidone, iprodione, vinclozolin, fluazinan and methyl thiophanate on the carpogenic and myceliogenic germination of Sclerotinia sclerotiorum sclerotia, in soil, were tested in gerbox. Three hundred grams of soil were placed in each gerbox and twenty five sclerotia were buried in each one at a depth of 2.0 cm. The fungicides were applied at a dose of 0.5 kg.ha-1 i.a., in the soil, simulating a water depth of 6.0 m. In general, vinclozolin was the best treatment, with an efficiency of 100% in inhibition of stipes and apothecia. Fluazinan allowed the formation of ones unviable stipes, resulting in absence of apothecia. The myceliogenic germination of the sclerotia was observed after 15 days of incubation. Methyl thiophanate showed 75% efficiency in the inhibition of myceliogenic germination followed by procymidone and vinclozolin, with 60% efficiency on average. Benomyl, fluazinan and iprodione were least efficient in the inhibition of the myceliogenic germination of the sclerotia, not differing statistically from the control. After 30 d
INFLUêNCIA DA DENSIDADE DE INóCULO DE Fusarium solani f.sp. phaseoli NA SEVERIDADE DA PODRID O RADICULAR SECA DO FEIJOEIRO EFFECT OF Fusarium solani f.sp. phaseoli INOCULUM DENSITY ON DRY ROOT ROT SEVERITY IN THE COMMON BEAN
Gesimária Ribeiro Costa,Jefferson Luis da Silva Costa
Pesquisa Agropecuária Tropical , 2007, DOI: 10.5216/pat.v34i2.2330
Abstract: Foram testadas quatro densidades de inóculo de Fusarium solani, em gramas por litro de solo (1,0; 2,0; 4,0 e 8,0) e um tratamento testemunha, em solo tipo Latossolo Vermelho-Escuro, cultivado e n o cultivado, com o objetivo de determinar a densidade mínima de inóculo no solo necessária para a ocorrência de podrid o radicular seca do feijoeiro. Como variáveis respostas foram avaliadas: número de microorganismos totais do solo, número de propágulos de F. solani, atividade microbiológica total do solo e severidade da doen a em plantulas. Os resultados indicaram que a densidade de inóculo do fungo variou com o tipo de solo. Para um solo n o cultivado a densidade necessária para causar a doen a esteve acima de 5.127 propágulos por grama de solo, enquanto para o solo cultivado a densidade de inóculo para causar doen a foi de 3.701 propágulos por grama de solo. Os índices de doen a em plantulas cultivadas sob o solo cultivado foram duas vezes superiores ao índice de doen a de plantulas sob o solo n o cultivado. A atividade microbiológica total nos solos, determinada pela desidrogenase de fluorescina diacetato, n o se correlacionou com a popula o dos microorganismos, indicando que a simples presen a desses n o implica em que estejam ativos. PALAVRAS-CHAVE: Solo supressivo; solo conducivo; Phaseolus vulgaris. Four densities of Fusarium solani inoculum (1, 2, 4 and 8 g/L of soil) were tested for determining the minimum inoculum density for the occurrence of bean dry root rot, in two soil types. The response variables evaluated were the total number of microorganisms in the soil, the number of F. solani f. sp. phaseoli propagules, total soil microbial activity and seedling disease severity. The results indicated that the minimum inoculum density for disease occurrence varied with the soil type. For a non-cultivated soil, the minimum inoculum density was greater than 5,127 propagules per gram of soil, while for cultivated soil, the minimum inoculum density was 3,701 propagules per gram of soil. Disease severity in seedlings grown in cultivated soil was twice as great as for those grown in non-cultivated soil. Total soil microbial activity, as determined by dehydrogenase of fluorescein diacetate, did not correlate with the population of the pathogen, indicating that the mere presence of these organisms in the samesoils does not imply that they are active. KEY-WORDS: Suppressive soil; conducive soil; Phaseolus vulgaris.
INFLUêNCIA DO SOLO E DE SUBSTRATOS PARA PRODU O DE ESCLERóDIOS NA GERMINA O CARPOGêNICA DE Sclerotinia sclerotiorum INFLUENCE OF SOIL AND SUBSTRATES ON SCLEROTIUM PRODUCTION IN THE CARPOGENIC GERMINATION OF Sclerotinia sclerotiorum
Gesimária Ribeiro Costa,Jefferson Luis da Silva Costa
Pesquisa Agropecuária Tropical , 2007, DOI: 10.5216/pat.v36i2.2130
Abstract: Com objetivo de encontrar um substrato que forne a uma quantidade suficiente de escleródios do fungo Sclerotinia sclerotiorum e um solo que permitia a sua germina o, utilizouse os substratos arroz em casca e cenoura, para produ o de escleródios, e amostras de solo, Latossolo Vermelho-Escuro, com dois históricos de cultivo: um cultivado com feij o sob condi es de piv central e outro n o cultivado. Observou-se que ambos substratos foram eficientes para produ o dos escleródios, entretanto, os escleródios produzidos em substrato à base de arroz em casca originaram maior número de apotécios quando enterrados nos solos. Houve influência do histórico de solo na germina o carpogênica dos escleródios. O solo n o cultivado apresentou características supressivas evidenciadas pelo retardamento do aparecimento de estipes e forma o mais lenta dos apotécios, além da redu o do número de estipes e apotécios formados, em rela o ao solo cultivado. PALAVRAS-CHAVE: Supressividade; conducividade; Phaseolus vulgaris. In order to select the best substratum for production of sclerotia and a soil for carpogenic germination, two substrata, rice husks and carrots, and two samples of a Dark Red Latossol with contrasting histories – cropped soil with bean under central pivot irrigation, and uncropped soil – were used. Both substrata were efficient for sclerotia production. However, sclerotia produced on rice husks formed larger numbers of apothecia when buried in soil. Soil history affected the carpogenic germination of sclerotia significantly. The uncropped soil showed suppressive characteristics, indicated by a delay in the appearance of the stipes, slow apothecia formation, and smaller number of stipes and apothecia formed, as related to the cropped soil. KEY-WORDS: Supressiveness; conduciveness; Phaseolus vulgaris.
The Dynamic-to-Static Conversion of Dynamic Fault Trees Using Stochastic Dependency Graphs and Stochastic Activity Networks  [PDF]
Gabriele Manno, Ferdinando Chiacchio, Francesco Pappalardo
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.52023
Abstract:

In this paper a new modeling framework for the dependability analysis of complex systems is presented and related to dynamic fault trees (DFTs). The methodology is based on a modular approach: two separate models are used to handle, the fault logic and the stochastic dependencies of the system. Thus, the fault schema, free of any dependency logic, can be easily evaluated, while the dependency schema allows the modeler to design new kind of non-trivial dependencies not easily caught by the traditional holistic methodologies. Moreover, the use of a dependency schema allows building a pure behavioral model that can be used for various kinds of dependability studies. In the paper is shown how to build and integrate the two modular models and convert them in a Stochastic Activity Network. Furthermore, based on the construction of the schema that embeds the stochastic dependencies, the procedure to convert DFTs into static fault trees is shown, allowing the resolution of DFTs in a very efficient way.

Dispers?o anemófila do fungo Lasiodiplodia theobromae em planta??es de coqueiro
Correia, Maiko S.;Costa, Jefferson L. da S.;
Fitopatologia Brasileira , 2005, DOI: 10.1590/S0100-41582005000200008
Abstract: the objective of this research was to study the aerial dispersion of lasiodiplodia theobromae, the causal agent of coconut (cocos nucifera) leaf blight, and its relationship with pluviometric precipitation. five wind catcher spore traps and one burkard spore trap were installed in a coconut plantation, at a height of 1.80 m from the ground. the conidia were captured in transparent tapes covered with gelvatol and vaseline. every week, the tapes were retrieved and mounted on slides for microscopy, where the number of trapped conidia was determinated. for the wind catcher trap, the highest amount of trapped conidia was 231 units in the month of october. for the burkard spore trap the highest amount of captured conidia was 3072 units achieved in june. in general, during a-year-round sampling, there was a predominance of conidia liberation during the diurnal period. the highest amount of conidia was captured from 6:00 to 10:00 a.m. the number of conidia trapped by the two types of devices correlated positively with the amount of precipitation ranging from 25 to 80 mm. above 80 mm of rain, the correlation was negative. curves of tendency were established indicating that the amount of conidia captured by the two types of spore traps is a function of monthly precipitation and that both devices showed similar curves of tendency. the liberation of conidia was stimulated whenever precipitation reached a minimum of 25 mm. the curves maximum point, correspond to 80 mm of rain, indicating that above this volume the conidia were precipitated.
Compatibilidade vegetativa de nit-mutantes de Fusarium solani patogênicos e n?o-patogênicos ao feijoeiro e à soja
Oliveira, Virgínia C. de;Costa, Jefferson L. S. da;
Fitopatologia Brasileira , 2003, DOI: 10.1590/S0100-41582003000100013
Abstract: the purpose of this study was to determine the relatedness 18 isolates of fusarium solani f. sp. phaseoli and f. solani f. sp. glycines. the majority of these isolates have shown host un-especificity and were pathogenic to dry-bean (phaseolus vulgaris) and soybean (glycine max). the vegetative compatibility groups (vcg) of these isolates were determined. the nit-mutants (kclo3) of each isolate were paired on a nan03 minimal media to verify the heterocariosis formation. among the 18 isolates of f. solani, 13 were gathered in a single vcg. the nit-mutants strains of isolate f42, f. sp. phaseoli and isolate f46, f. sp. glycines were compatible to each other. three isolates consisted of single members of different vcgs and one of these isolates was not even incompatible with itself. vegetative compatibility, therefore, was found among isolates of f. solani f. sp. phaseoli and f. solani f. sp. glycines. this compatibility could be a reason for the existence of isolates pathogenic to both crops.
Avalia??o da resistência de cultivares e linhagens do feijoeiro comum a diferentes popula??es de Uromyces appendiculatus
RIOS, GERSON P.;ANDRADE, EIKO M.;COSTA, JEFFERSON L. S.;
Fitopatologia Brasileira , 2001, DOI: 10.1590/S0100-41582001000200002
Abstract: the detached-leaf technique has long been used in plant disease studies. in this research, the technique was used on dry bean (phaseolus vulgaris) leaves detached and cultivated in vermiculite to study the resistance of bean cultivars to different populations of bean rust (uromyces appendiculatus) collected from different regions on different dates. the symptoms expressed by the whole plant were compared to those expressed on detached leaves. the lesions types in detached leaves were analogous to those on intact plants. the cultivars aporé, novo jalo, and corrente were resistant to all populations of the pathogen. the detached-leaf cultivated in vermiculite technique exhibited advantage in relation to other techniques for resistance evaluation. this technique permits the retention of more leaves in the same recipient, facilitates evaluation of more cultivars besides the economy of space and convenience in conducting the work.
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