Abstract The wide application of gold nanoparticles has attracted much attention to the development research in nanoparticles. In this study, were prepared by chemical reduction method using potassium tetrachloroaurate as source and sodium borohydride reducer agent. formation was confirmed surface plasmon spectra ultraviolet-visible spectroscopy at wavelength 507 nm. capping process studied two...

Since the advent of paper chromatographic methods in 1944 (l), extracts of a great many plant species have been examined for the presence of amino acids. Aspartic acid and its amide asparagine have almost invariably been found. Recognition of the importance of these substances goes back to the earliest days of plant biochemistry. Vauquelin and Robiquet first isolated asparagine in 1806 (2) from...

Escherichia coli cells are shown to be attracted to the l-amino acids alanine, asparagine, aspartate, cysteine, glutamate, glycine, methionine, serine, and threonine, but not to arginine, cystine, glutamine, histidine, isoleucine, leucine, lysine, phenylalanine, tryptophan, tyrosine, or valine. Bacteria grown in a proline-containing medium were, in addition, attracted to proline. Chemotaxis tow...

Several amino acids were found to stimulate glycogen synthesis and lipogenesis, and to inhibit ketogenesis in isolated rat hepatocytes. When hepatocytes were incubated in the presence of 20 mM-glucose, the amino acids could be classified in decreasing order of efficiency as follows: glutamine and proline, alanine, aminoisobutyric acid, asparagine and histidine for stimulation of glycogen synthe...

b[U-‘4Claspartate, L-[U-‘4C]asparagine, and L-[U-“‘Clarginine were administered luminally into isolated segments of rat jejunum in situ, and the radioactive products appearing in venous blood from the segment were identified and quantified, in a continuation of similar studies with L-glutamate and L-glutamine (Windmueller, H. G., and Spaeth, A. E. (1975) Arch. Biochem. Biophys. 171, 662-672). A...

In order to ascertain whether autistic children display characteristic metabolic signatures that are of diagnostic value, plasma amino acid analyses were carried out on a cohort of 138 autistic children and 138 normal controls using reverse-phase HPLC. Pre-column derivatization of amino acids with phenyl isothiocyanate forms phenyl thio-carbamate derivates that have a lamba(max) of 254 nm, enab...

Aminooxyacetate, a known inhibitor of transaminase reactions and glycine decarboxylase, promotes rapid depletion of the free pools of serine and aspartate in nitrate grown Lemna minor L. This compound markedly inhibits the methionine sulfoximine-induced accumulation of free ammonium ions and greatly restricts the methionine sulfoximine-induced depletion of amino acids such as glutamate, alanine...

With this system, no deamidation of glutamine occurred in the absence of a-keto acid, and, with all keto acids tested except two (pyruvate and a-ketobutyrate), transamination was absent or extremely slow when glutamate was substituted for glutamine. Experiments with W-labeled glutamine indicated that the ammonia evolved during this reaction was derived from t.he amide group of glutamine. Althou...

The myogenic factors (MYF) 5 gene has been reported to contribute to muscle growth and development, therefore they are considered as candidate genes for growth and meat quality related traits. The MYF5 gene is expressed during proliferation of myoblasts and comprises 3 exons. To ascertain whether there is any variation in the camel MYF5 gene, we have used a polymerase chain reaction-single stra...

A new enzyme termed GA: 1.2, possessing approximately equal amounts of glutaminase and asparaginase activity, has antitumor activities against cancers other than leuke mia, thus enlarging the potential for cancer therapy by amino acid deprivation. When tested against the asparagine-dependent EARAD-1 leukemia in the presence of the láclatedehydrogenase-elevating virus (LDH-virus), striking tumo...