Avaliação dos impactos econômicos, sociais e ambientais de tecnologias da Embrapa Pecuária Sudeste. 1. Utilização de touros da raça Canchim em cruzamento terminal com fêmeas da raça Nelore.

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Comportamento sexual de touros das raças Canchim e Nelore.

O comportamento sexual foi avaliado em sete touros da raça Canchim e oito Nelores aos 27 e 29 meses de idade, através dos testes de libido, capacidade de serviço e tempo de reação

Concentrações plasmaticas de testosterona e suas relações com características reprodutivas em touros das raças Canchim e Nelore.

Níveis plasmaticos de testosterona foram determinados em 7 touros da raça canchim e 8 touros da raça nelore, aos 27 e 39 meses de idade.Resumo

A dissemination strategy for immunizing scale-free networks

We consider the problem of distributing a vaccine for immunizing a scale-free network against a given virus or worm. We introduce a new method, based on vaccine dissemination, that seems to reflect more accurately what is expected to occur in real-world networks. Also, since the dissemination is performed using only local information, the method can be easily employed in practice. Using a random-graph framework, we analyze our method both mathematically and by means of simulations. We demonstrate its efficacy regarding the trade-off between the expected number of nodes that receive the vaccine and the network's resulting vulnerability to develop an epidemic as the virus or worm attempts to infect one of its nodes. For some scenarios, the new method is seen to render the network practically invulnerable to attacks while requiring only a small fraction of the nodes to receive the vaccine

Honey sugars analysis by ion chromatography method with Integrated Pulsed Amperometric Detection (IPAD)

Glucose and fructose are the most important monosaccharides in honey, these sugars combined in various forms comprise the di- and trisaccharide fractions of floral honey. Frutose/glucose ratio can influence the flavor of honey since fructose is sweeter than glucose. Honeys with higher fructose/glucose ratios remain liquid for longer periods. Several Chromatographic methods have been used to evaluate the sugar content of honey, although the Integrated Pulsed Amperometric Detection (IPAD) only recently became to be used. In order to characterize the sugar content in honey from different botanical origins a Dionex ICS3000 ion chromatograph was used. Separation was performed in a column “CarboPacTM PA20 3x150mm”, with a precolumn “CarboPacTM PA20 3x30mm”. Electrochemical detector in Integrated Pulsed Amperometric Detection (IPAD) mode was used. The elution was performed with a gradient with two NaOH solutions (10 and 200 mM). Standard solutions of glucose, fructose and sucrose, were used to identify and quantify the individual sugar components in the honey samples. The method showed a good separation between the compounds (resolution> 3.3 and more than 9000 theoretical plates). The response was linear in the range (0.05 to 1.00 mg/L for fructose and glucose and 0.01 to 0.20 mg/L for sucrose). The detection limits were 0.014 mg/L for glucose, 0.007 mg/L for fructose and 0.003 mg/L for sucrose. Twenty six monofloral honey samples from Erica, Citrus, Lavandula and Eucalyptus were tested. 5,000 g of each honey sample was diluted to 1 mg/L and filtered with a 0.45 m polypropylene filter prior to HPLC analysis. The results show that the fructose/glucose ratios are in accordance with the different honeys analyzed and the HPLC-IPAD is a good methodology to determine the sugar content in honey, with low solvent consumption and residues

Aspectos físicos do sêmen de touros das raças Canchim e Nelore.

Avaliação e comparação das características físicas do ejaculador de touros das raças Canchim e Nelore, criados em regime de pastos.Resumo

Comportamento sexual de touros das raças Canchim e Nelore.

Foram utilizados 7 touros Canchim e 8 touros Nelore, criados em regime de pasto e avaliados aos 2 e 3 anos de idade, nos períodos de Janeiro a Marco de 1986 e 1987, com o objetivo de avaliar o desempenho de touros Canchim e Nelore nos testes de comportamento sexual

Causas de variação de características de crescimento do nascimento a desmama de bezerros da raça Charolesa.

Causas da variação não genética dos pesos ao nascer (PN) aos 205 dias e aos 270 dias de idade e das taxas absolutas e relativas de crescimento do nascimento a desmama