Purine Derivatives
Mostrando 13-24 de 116 artigos, teses e dissertações.
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13. Levels of crude protein in diets for dairy Holstein cows in tie stall / Níveis de proteína bruta em dietas para vacas leiteiras da Raça Holandesa em confinamento
It was evaluated the effect of diets with levels crude protein - CP (10, 12, 14 and 16% in dry matter - DM) on the performance and efficiency of utilization of nutrients in dairy cows. Twelve Holstein cows with average body weight (BW) of 570 kg, milk production (MP) of 13 kg/day were distributed in three 4x4 Latin squares. The feed consisted of 75% of corn
Publicado em: 2009
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14. Desempenho e avaliação nutricional de dietas contendo farelo de mamona para bovinos / Performance and nutritional evaluation of diets containing castor meal to cattle
The castor bean (Ricinus communis L.) has been traditionally cultivated in some parts of Brazil with an economic and social role. Thus, because of the high potential of productivity that this culture shows, there is a possibility to increase the use of the castor beans by- products as a protein source in ruminant diets. In order to evaluate the use of castor
Publicado em: 2009
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15. Silagens e fenos em associação à palma forrageira para vacas em lactação e ovinos
This study was conducted to determine the performance of lactating Holstein/zebu cows fed diets based on spineless cactus with different fiber sources, namely sorghum silage, sunflower silage, guandu hay, leucena hay and elephant-grass hay. Five cows (body weight 500 kg and average milk production 12kg) were used in 5 x 5 Latin square design with 12-day peri
Publicado em: 2008
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16. Performance and feed efficiency of lactating cows supplemented with live yeast / DESEMPENHO E EFICIÃNCIA ALIMENTAR DE VACAS LEITEIRAS SUPLEMENTADAS COM LEVEDURA VIVA
Performance and nutrient utilization of dairy cows supplemented with Saccharomyces cerevisiae strain CNCM I-1077 (Lallemand SAS, France) were evaluated. Twenty Holsteins, averaging 143Â49 days in lactation at the beginning of the trial, formed ten blocks based on milk yield and were randomly assigned to a sequence of two treatments, in a cross-over design,
Publicado em: 2008
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17. ATIVIDADES DE DERIVADOS PURÍNICOS SOBRE LEISHMANIA AMAZONENSIS E LEISHMANIA CHAGASI
As leishmanioses são um grupo de doenças causadas por diferentes espécies do gênero Leishmania que afetam mais de 12 milhões de pessoas em todo o mundo. As manifestações clínicas podem variar desde simples lesões cutâneas à leishmaniose visceral que pode ser fatal. A quimioterapia convencional baseia-se em múltiplas injeções parenterais com ant
Publicado em: 2008
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18. Nutritional evaluation of sugarcane treated with calcium oxide at different times of exposure to cattle / Avaliação nutricional da cana-de-açúcar acrescida de óxido de cálcio em diferentes tempos de amazenamento para bovinos
Were performed 4 experiments aiming evaluate the chemical composition and in vitro and in situ digestive kinetics of sugarcane treated with calcium oxide at different exposure times under nutrients intake and digestibility, performance, and ruminal parameters of Nellore heifers. The first experiment aimed to evaluate the effects of levels of inclusion and ex
Publicado em: 2008
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19. Use of different forms of soybeans in dairy cows feeding / Utilização da soja em diferentes formas na alimentação de vacas leiteiras
The research was carried out to evaluate the in situ ruminal degradation and the intestinal digestibility of raw and roasted soybeans and the effect of diets containing different forms of soybeans on the consumption, nutrient digestibility, production and milk composition, variation in pH and ruminal N-NH3 concentration, urea excretion in urine, concentratio
Publicado em: 2007
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20. Performance of Nellore cattle fed individualy or in group, nutrient requirements and proteic evaluation of feeds for ruminants / Desempenho de bovinos Nelore alimentados individualmente ou em grupo, exigências nutricionais e avaliação protéica de alimentos para ruminantes
The present work was developed based on four experiments. The two firsts were conducted aiming to evaluate the fecal dry matter production using total fecal collection or estimated by chromic oxide (Cr2O3), titanium dioxide (TiO2), isolated, purified and enriched lignin of Eucalyptus grandis (LIPE), indigestible neutral and acid detergent fiber (NDFi and ADF
Publicado em: 2007
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21. Desempenho, composição corporal e exigências nutricionais de bovinos Nelore de diferentes classes sexuais / Performance, body composition and nutritional requirements of Nellore bulls, steers and heifers
This work was comprised of two experiments that were carried out with the objective of assessing the performance, nutrients intake and digestibilities, feed efficiency, carcass traits, body composition and energy and protein requirements of Nellore bulls, steers and heifers. The first trial was carried out through July and September, 2004, using 48 animals (
Publicado em: 2006
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22. Purine-mediated growth inhibition caused by a pyrE mutation in Escherichia coli K-12.
A purine-sensitive phenotype results from a previously described mutation in the structural gene (pyrE) for orotate phosphoribosyltransferase (OPT) in Escherichia coli K-12. OPT from both the mutant and the wild-type was partially inhibited by adenine and adenosine, although other purine derivatives were not effective for this inhibition. The Km values of th
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23. Metabolism of Methylated Purines in Escherichia coli: Derepression of Purine Biosynthesis
Love, Samuel H. (Bowman Gray School of Medicine, Wake Forest College, Winston-Salem, N.C.), and Charles N. Remy. Metabolism of methylated purines in Escherichia coli: derepression of purine biosynthesis. J. Bacteriol. 91:1037–1049. 1966.—Various methylated purines were examined for their effects on growth of purine-requiring mutants of Escherichia coli,
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24. Comparative study by circular dichroism of the conformation of deazapurine nucleosides and that of common purine nucleosides.
Purine nucleoside analogs modified by replacement of the nitrogen atom at the 3 position by a CH group give a characteristic circular dichroism curve that is not substantially modified by chemical substitution at the 8 position. Since it is rather well established that 8-substituted purine nucleosides are predominantly in the syn conformation in aqueous solu