S-2-Aminoethyl cysteine (AEC) reduced both growth rate and final growth level of Serratia marcescens Sr41. The growth inhibition was completely reversed by lysine. AEC inhibited the activity of lysine-sensitive aspartokinase to a lesser extent than lysine. The AEC addition to the medium lowered not only the level of lysine-sensite aspartokinase but also those of homoserine dehydrogenase and thr...

This study aimed to evaluate the yields of by-products and residues morphometry juvenile tambaqui Colossoma macropomum undernutrition with different levels lysine. Diets were elaborated containing 6.60, 9.72, 12.84, 15.96, 19.08, 22.20 g kg -1 total lysine, these fed fish distributed in 18 tanks (310 L each one) for 90 days. Morphometric analysis, measurements whole fish, by-products, taken com...

In the pharmaceutical industry, cryoprotectants are added to buffer formulations protect active ingredient from freeze- and thaw damage. We investigated freezing thawing of aqueous sodium citrate with various cryoprotectants, specifically amino acids (cysteine, histidine, arginine, proline lysine), disaccharides (trehalose sucrose), polyhydric alcohols (glycerol mannitol) surfactants (polysorba...

Maize seed storage proteins are a major source of human and livestock consumption. However, these proteins have poor nutritional value, because they are deficient in lysine and tryptophan. Much research has been done to elevate the lysine content by reducing zein content or regulating the activities of key enzymes in lysine metabolism. Using the naturally lysine-rich protein genes, sb401 and SB...

Salmonella enterica serovar Enteritidis is one of the leading causes of food-borne diseases in Japan. Typically, Salmonella spp. test positive for lysine-decarboxylase. However, the number of isolates of serovar Enteritidis without lysine-decarboxylase activity increased in Japan in 2003. Among 109 strains from distinct outbreaks, 10 lacked lysine-decarboxylase activity. Nine of the ten lysine-...

one experiment was conducted with a total of 2000 broiler breeders (lohman strain) at 74 weeks of age, which lasted for 10 weeks. birds were randomly assigned to two dietary treatments varying in dietary crude protein (cp). the reduced-cp diet had dietary cp level approximately 1.5 percentage units lower than the control (15.5 vs 14.0%). by supplementing 0.13 and 0.1% of dl-methionine and l-hcl...

In studies of the inhibition in viva of animal viruses by poly-n-lysine, Rubini et al. (1) and Green et al. (2-4) obtained data which suggested that poly-L-lysine is hydrolyzed by the proteolytic enzymes of the allantoic fluid, and that this enzymatic hydrolysis may limit its biological activity. The enzymatic hydrolysis of poly-n-lysine was reported by Katchalski (5) and by Waley and Watson (6...

 This study was carried out to investigate the apparent digestibility coefficients (ADCs) value of protein, amino acid and energy and body amino acid composition of rainbow trout fed solvent extracted soybean meal (SBM) and full-fat soybean meal (FFS) partly replacing fish meal (FM) in diets. Five iso nitrogenous (average 50.36% crude protein) and energetic (4294 kcal/kg total energy) ...