L Isoleucine
Mostrando 13-24 de 269 artigos, teses e dissertações.
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13. Are high-lysine cereal crops still a challenge?
The essential amino acids lysine and threonine are synthesized in higher plants via a pathway starting with aspartate that also leads to the formation of methionine and isoleucine. Lysine is one of most limiting amino acids in plants consumed by humans and livestock. Recent genetic, molecular, and biochemical evidence suggests that lysine synthesis and catab
Brazilian Journal of Medical and Biological Research. Publicado em: 2005-07
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14. Determination of crude protein and amino acids in soybean mealby Near Infrared Spectroscopy / Determinação de proteina bruta e aminoacidos em farelo de soja por espectroscopia no infravermelho proximo
In this work it was determined the amount of crude protein and amino acids in soybean meal by using near infrared spectroscopy and multivariate calibration base on partial least squares method (PLS). It was used 150 samples from different brazilian regions divided in several suppliers as Bunge, Caramuru, Cargill, Ceval and ADM that insure a good distribution
Publicado em: 2005
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15. Purificação, caracterização bioquimica e funcional de uma serinoprotease (Uruprot) do veneno de Bothrops alternatus (Urutu)
Snake venoms contain a high variety of toxic compounds and enzymes. Venom purified proteases are structurally dassified as serine proteases and metalloproteases, and showa potent effect on blood coagulation, acting on hemostasis, thrombosis, fibrinolysis and platelet aggregation. The aim of this work was the purification and characterization of a serine prot
Publicado em: 2000
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16. Composition and biological value of protein from four varieties of maize (Zea mays L.) in two stages of maturation / Composição e valor biologico das proteinas de quatro variedades de milho (Zea mays L.) em dois estagios de maturação
The principal aim of the present work was a comparative chemical and nutritional study of four varieties of corn in two stages of maturation: green (20 days after polli nation) and dry. The four varieties studied are characterized by the following endosperm genotypes with respect to carbohydrates and protein: Normal Maya (Su02); Sweet Piramex (suo2); Opaque
Publicado em: 1980
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17. Limites minimos de sensibilidade e caracterização da qualidade de gosto para 21 aminoacidos
A determination of thresholds of difference and taste for 21 L-amino acids was carried out employing five concentrations with decreasing percentages in logarithmic scale and using distilled water as control. Three series of experiments were conducted using concentration ranges of 0.5 - 0.0312%; 0.125 - 0,0078% and 0.0078 - 0.0004%, respective1y. The tasting
Publicado em: 1975
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18. Biogenetic Origin of the d-Isoleucine and N-Methyl-l-Alloisoleucine Residues in the Actinomycins
Studies with 14C-labeled isoleucine stereisomers have established that l-alloisoleucine, d-alloisoleucine, and d-isoleucine may function as precursors for the biogenesis of d-isoleucine and N-methyl-l-alloisoleucine residues in actinomycin. l-[14C]isoleucine appears to be employed chiefly for d-alloisoleucine (and N-methylisoleucine [?] formation); however,
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19. Inhibition of Escherichia coli isoleucine biosynthesis by isoleucine tetrazole.
Growth of a derivative of Escherichia coli K-10 was strongly inhibited by 2 times 10(-4) M L-5(1-amino-2-methylbutyl)-tetrazole (isoleucine tetrazole). Growth inhibition was reversed by isoleucine, threonine, glycyl-L-isoleucine, or glycyl-L-threonine, and, in a valine-resistant mutant, by L-valine. Partial reversal of growth inhibiton was effected by L-leuc
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20. Increase in Isoleucine Accumulation by α-Aminobutyric Acid-Resistant Mutants of Serratia marcescens
Several α-aminobutyric acid-resistant (Abu-r) mutants of Serratia marcescens were found to be superior to the parent strain in converting d-threonine to l-isoleucine. One of them accumulated 1.5 times more l-isoleucine that the parent strain. The level of acetohydroxy acid (AHA) synthetase in this mutant increased twofold above that of the parent strain. In
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21. Repression and inhibition of transport systems for branched-chain amino acids in Salmonella typhimurium.
Kinetics of the transport systems common for entry of L-isoleucine, L-leucine, and L-valine in Salmonella typhimurium LT2 have been analyzed as a function of substrateconcentration in the range of 0.5 to 45 muM. The systems of transport mutants, KA203 (ilvT3) and KA204 (ilvT4), are composed of two components; apparent Km values for uptake of isoleucine, leuc
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22. ROLE OF VALINE AND ISOLEUCINE AS REGULATORS OF ACTINOMYCIN PEPTIDE FORMATION BY STREPTOMYCES CHRYSOMALLUS
Katz, Edward (Rutgers, The State University, New Brunswick, N. J.), Clarence R. Waldron, and Mary Lou Meloni. Role of valine and isoleucine as regulators of actinomycin peptide formation by Streptomyces chrysomallus. J. Bacteriol. 82:600–608. 1961—d-Valine is an effective inhibitor of actinomycin synthesis by Streptomyces chrysomallus; l-valine stimulate
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23. Influence of Isoleucine upon Quinomycin Biosynthesis by Streptomyces sp. 732
When dl-isoleucine was added to an ammonium nitrate-maltose medium during cultivation of Streptomyces sp. 732, quinomycin B formation was selectively enhanced (from 3 to 70% of the quinomycin mixture) and quinomycin C synthesis was inhibited completely. In addition, two new quinomycins, designated quinomycins D and E, were produced in the presence of isoleuc
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24. Use of the Stereoisomers of Isoleucine by Lactobacillus fermenti
The use of four stereoisomers of isoleucine by Lactobacillus fermenti strain 36 was studied in detail. All four isoleucine isomers were used for growth in the presence of vitamin B6 compounds, but only l-isoleucine was active in the absence of these vitamins. Of the vitamin B6 compounds, pyridoxal and pyridoxamine were equally more effective than pyridoxine