1. Plasma and buffy-coat vitamin C, urinary proline, hydroxyproline, creatinine and total amino acid concentrations were meausred in 23 healthy elderly subjects at intervals of 3 months. 2. There was a strong positive correlation between plasma vitamin C and buffy-coat vititamin C. 3. There were not significant correlations between plasma or buffy-coat vitamin CPAMIN C. 3. There were not signif...

Sum frequency generation vibrational spectroscopy (SFG) and quartz crystal microbalance with dissipation monitoring (QCM-D) are employed to study the interfacial structure and adsorbed amount of the amino acids L-lysine and L-proline and their corresponding homopeptides, poly-L-lysine and poly-L-proline, at two liquid-solid interfaces. SFG and QCM-D experiments of these molecules are carried ou...

Kumar, V., Ghai, 0. P., and Chase, H. P. (1971). Archives of Disease in Childhood, 46, 801. Intestinal dipeptide hydrolase activities in undernourished children. Intestinal dipeptide hydrolase enzymes cleave dipeptides into amino acids. In 8 undernourished children with diarrhoea, mean intestinal mucosal glyclyl-proline hydrolase activity was reduced 40%, valyl-proline hydrolase activity 38%, a...

An accurate method for determination of proline in serum has been adapted to a micro scale, with good results. Acidic ethanol is used as a serum deproteinizing agent prior to development of color with ninhydrin and its extraction into benzene. The range of accuracy is ± 3.0% with as little as 0.2 ml. serum. The microdetermination of this amino acid facilitates study of the intermediary metaboli...

Tropoelastin a was isolated from lathyritic chick aortae by using severe denaturing conditions for the initial extraction. The amino acid composition of this new species of tropoelastin is elastin-like in its high proportion of proline, glycine, alanine and valine. However, it differs from authentic tropoelastin b in containing a higher percentage of polar amino acids and cysteine residues. In ...

The synthesis of a proline-rich cyclic heptapeptide, fanlizhicyclopeptide A (8), previouslyisolated from the fruits of Annona squamosa (sugar-apples), is described via coupling oftetrapeptide l-prolyl-l-tyrosyl-l-leucyl-l-proline methyl ester with tripeptide Boc-glycyl-lvalyl-l-proline followed by cyclization of the linear fragment having seven amino acid units.Structure of the synthesized cycl...

The study was focused on the effect of drought and waterlogging stresses in two-year pot experiments peat substrate content glucose, fructose sucrose free amino acids potato tubers four cultivars (yellow-fleshed Laura, Marabel, Milva blue-fleshed Valfi) after 71 days exposure to conditions (BBCH 909). Drought increased levels fructose, three except for cv. Laura. stress l-proline (+248.4%), l-h...