The myeloperoxidase (MPO)-mediated decarboxylation of amino acids and the MPO-mediated oxidation of methionine, two potential bactericidal mechanisms, were compared. In the presence of the MPO system (MPO, 50 mU/ml; H(2)O(2), 0.1 mM; Cl(-), 75 mM), 50% of alanine (0.1 mM) was decarboxylated, whereas only 5% of methionine (0.1 mM) was decarboxylated. In contrast, under similar conditions, 80% of...

this study surveys on the effects of l-lysine and methionon amino acids on growth performance, survival rate and body composition of rainbow trout (oncorhynchus mykiss). fish with initial average weight 105.23 +  6.33 g in 5 treatments fed with different levels of lysine (1 and 3 %) and methionine ( 1 and 2%) for 8 weeks. the results showed that the treatment which fed 2 % methionine had the be...

Since selenomethionine appears to be a better precursor of ethylene in senescing flower tissue of Ipomoea tricolor and in indole acetic acid-treated pea stem sections than is methionine (Konze JR, N Schilling, H Kende 1978 Plant Physiol 62: 397-401), we compared the effectiveness of selenomethionine and methionine to participate in reactions which may be connected to ethylene biosynthesis. Evid...

This study was aimed at investigating the effects of quercetin on mRNA expression and activity of critical enzymes in homocysteine metabolism in rats fed a methionine-enriched diet. Rats were fed for 6 weeks the following diets, that is, control, 0.5% quercetin, 1.0% methionine, and 1.0% methionine plus 0.5% quercetin diets. Serum homocysteine was significantly increased after methionine treatm...

Regulation of the methionine biosynthesis and transport genes in bacteria is rather diverse and involves two RNA-level regulatory systems and at least three DNA-level systems. In particular, the methionine metabolism in Gram-positive bacteria was known to be controlled by the S-box and T-box mechanisms, both acting on the level of premature termination of transcription. Using comparative analys...

1. Young male rats were used in five experiments to study the utilization for growth of methionine sulphoxide, and the relationship between the sulphoxide content in the diet and the level of microbiologically determined methionine activity in blood or blood plasma. In one nitrogen-balance experiment methionine and methionine sulphoxide were compared as supplements to a casein diet and a fish-m...

this study was conducted to compare the bio-efficacy of herbal methionine (h-met) relative to dl-methionine (dl-met) on 160 “ross 308” broiler chickens. dl-met and h-met were added to the basal diet in eight experimental treatments with three and four concentrations respectively in starter, grower and finisher period. blood parameters which were measured at 24 and 42 days of age consisted of: s...

introduction: skin resistance is greatly dependent on its collagen amount and nutritional substances such as crude protein that affect the skin collagen can indirectly influence the skin resistance and increase its strength. in this regard, this study aimed to evaluate the effect of in ovo methionine injection on histomorphometry of the skin layers. methods: thirty fertilized eggs of ross 308 b...