Wright et al. (1949) announced the isolation in crystalline form of a naturally occurring complex of biotin from yeast, designated as biocytin. The possible metabolic role of biocytin in aspartic acid deaminase was studied by these investigators and the results showed that it was less active than an equivalent of biotin in the stimulation of this enzyme in aged bacterial suspensions. Inasmuch a...

Suspensions of Clostridium welchii (strain SR 12) quantitatively decarboxylate the L isomers of aspartic (1) and glutamic acids (2) to ar-alanine and y-aminobutyric acid, respectively. Although a quantitative procedure for the determination of glutamic acid based upon decarboxylation with this organism has been described (3), it has been found that aspartic acid, especially in the presence of c...

To characterize acidic amino acid transport in type 2 astrocytes, we established conditionally immortalized rat astrocyte cell lines (TR-AST) from newly developed transgenic rats harboring temperature-sensitive SV40 large T-antigen gene. TR-AST exhibited positive immunostaining for anti-GFAP antibody and A2B5 antibody, characteristics associated with type 2 astrocytes, and expressed glutamine s...

Heterotrophic conversion of l-aspartic acid to nitrification products by Aspergillus flavus was studied in a replacement incubation system. Numerous amino acids supported nitrification; aspartate and glutamate were about equivalent as the best sources of nitrate. Addition of sodium bicarbonate to the incubation system substantially enhanced nitrate formation for all nitrifiable amino acids exce...

Four depsipeptides (peptide lactones), called cyanopeptolins A, B, C and D, have been isolated from the cyanobacterium Microcystis sp. PCC 7806. They possess identical structures consisting of cyclic L-glutamic acid-gamma-aldehyde, L-leucine, N-methyl-phenylalanine, L-valine, L-threonine, L-aspartic acid, hexanoic acid and a variable basic amino acid. This variable amino acid can be L-arginine ...

This study was conducted at the Animal Production Department/ College of Agriculture/ University Diyala from 15/9/2021 to 15/10/2021 investigate effect injecting D-aspartic amino acid in Shami Bucks on some blood biochemical and hormonal characteristics. Twelve's aged between 1.5-2 years, body weight ranged 35-40 kg. The animals were divided into four groups (treatments) with three replicates a...

In this study, the effects of sodium lauryl sulfate and various amino acids (DL-aspartic acid, dodecanedioic suberic acid) on formation calcium-deficient hydroxyapatite via hydrolysis α-tricalcium phosphate (α-TCP) were investigated; moreover, a combined effect these additives ethylene glycol as synthesis medium was also estimated. The reaction performed in solutions containing different concen...

The mammary gland is a system in which the components of the blood stream which are used by body tissues for protein synthesis can be readily investigated (Barry, 1956). Previous work has shown that the mammary gland takes the free essential amino acids from the blood stream to provide the essential amino acids of casein (Barry, 1952; Campbell & Work, 1952; Askonas, Campbell, Godin & Work, 1955...