Desempenho de bubalinos para carne no Estado do Acre.

Com o objetivo de avaliar o comportamento produtivo de bubalinos para carne, está sendo conduzido na Fazenda Experimental da UEPAE de Rio Branco, um projeto de pesquisa em sistemas de produção.bitstream/item/145806/1/1147.pd

Plantio da soja na época certa.

bitstream/item/75715/1/art-046.pdfPublicado também em: Página Rural, 27 set. 2010; Agronline, 28 set. 2010; Portal Dia de Campo, 28 set. 2010

A escolha certa da cultivar de soja.

bitstream/item/75713/1/art-045.pdfPublicado também em: Página Rural, 13 out. 2010; Portal do Agronegócio, 15 out. 2010; ZooNews, 17 out. 2010; Agronline, 18 de out. 2010, disponível no CRI7765

Surface photochemistry: photodegradation study of pyrene adsorbed onto microcrystalline cellulose and silica

Ground-state diffuse reflectance, time resolved laser-induced luminescence, diffuse reflectance laser flash-photolysis transient absorption and chromatographic techniques were used to elucidate the photodegradation processes of pyrene adsorbed onto microcrystalline cellulose and silica. Ground-state diffuse reflectance showed that on both substrates low concentrations display absorption of pyrene monomers. At high concentrations spectral changes attributed to aggregate formation were observed. Laser induced fluorescence showed that pyrene onto microcrystalline cellulose mainly presents fluorescence from monomers, while for silica, excimer-like emission was observed from low surface loadings (greater than or equal to 0.5 mumol g(-1)). Transient absorption and photodegradation studies were performed at concentrations where mainly monomers exist. On silica, pyrene presents transient absorption from its radical cation. On microcrystalline cellulose both radical cation, radical anion and pyrene triplet-triplet absorption were detected. Irradiation followed by chromatographic analysis showed that pyrene decomposes on both substrates. For pyrene on microcrystalline cellulose 1-hydroxypyrene was the main identified photoproduct since in the absence of oxygen further oxidation of 1-hydroxypyrene was very slow. For pyrene on silica photodegradation was very efficient. Almost no 1-hydroxypyrene was detected since in the presence of oxygen it is quickly oxidized to other photooxidation products. On both substrates, pyrene radical cation is the intermediate leading to photoproducts and oxygen it is not involved in its formation

Nutrient absorption in lambs fed diets containing different amounts of phosphorus

Objective. Evaluate the effect of increasing P intake on nutrient digestibility, and compare the true and apparent absorption coefficients of P and Ca in lambs. Materials and methods. Twenty-four Santa Ines sheep, with an average weight of 33.6 ± 1.6 kg, were distributed into four treatments (0, 2, 4 and 6 g/day of supplementary P) with forage: concentrate ratio of 70:30. The study of apparent nutrient digestibility was conducted during the first week, using the total feces collection method. During the second week, after injection of 7.4 MBq of 32P and 7.7 MBq of 45Ca, apparent (AAC) and true (TAC) absorption coefficients of P and Ca were determined. The lambs were kept in metabolic cages. Results. The increase in P intake did not affect (p>0.05) dry matter, crude protein, NDF or ADF digestibility, but the TAC of P and Ca and mineral matter digestibility decreased. The AAC was not affected (p=0.10). A cubic relationship was observed between P intake and TAC (TAC=2.16–1.95X+0.55X2-0.04X3; R2=0.38) and linear relationship with the TAC of Ca (TAC=0.559–0.03X; R2=0.26). TAC and AAC values were different (p<0.001). Conclusions. The increase in P intake doesn’t impact organic matter digestibility, but does affect P and Ca absorption. Apparent digestibility is not a reliable parameter to determine the efficiency of P and Ca absorption

Comportamento produtivo de caprinos de aptidão mista no Acre.

A caprinocultura nacional, atualmente, é representada por aproximadamente 9 milhões de cabeças, sendo que deste total, 92% encontram-se no Nordeste do Brasil, representando um componente dos sistemas de produção dos pequenos produtores dessa Região. No Acre, em face da produção irregular de proteínas de origem animal pelos pequenos produtores, a racionalização da caprinocultura é medida importante. A introdução de caprinos melhorados com padrão racial definido e melhores conhecimentos técnicos de manejo, possibilitarão o oferecimento de uma fonte de proteína de baixo custo, principalmente pela aptidão dupla do caprino em estudo.bitstream/item/117377/1/1148.pd

Influência da profundidade de semeio na germinação de sementes de mulungu (Erythrina vellutina Wild - Leguminosae).

O objetivo desse trabalho foi analisar a profundidade na germinação, avaliando-se o número médio de dias requeridos para a primeira emergência, a porcentagem de germinação (G) e o Índice de Velocidade de Emergência (IVE)