The transport of free amino acids into cells is the first step in protein synthesis, and, therefore, an essential part of growth. Hormones that increase protein synthesis and growth over a period of time can do so only if increased supplies of free amino acids are made available inside the cells. This increased supply may occur (a) through an increased formation of amino acids within the cells;...

Although soybean aphid (Aphis glycines) resistance is commercially available in the form of the Rag1 gene, the mechanism of this resistance is not fully understood. Amino acids are a limiting factor for aphid growth, and there is evidence that plant amino acid composition is related to aphid resistance. Antibiotic resistance like that conferred by Rag1 could be associated in part with both prot...

The microbiological assay procedure for the determination of amino acids is particularly well suited for routine analyses of low potency materials. Its application to metabolic studies includes the measurement of “apparent free” amino acids in plasma of a number of species (l-4), “free” (5-10) and total (6-10) amino acids in urine, and free amino acids in sweat (11) and cerebrospinal fluid (12)...

1. The effect of a protein-free meal and a protein-rich meal on the concentration of free amino acids in plasma and muscle tissue was studied in eight healthy subjects. The energy content of the protein-free meal was 3800 kJ. The protein-rich meal was identical in composition except that 50 g of bovine serum albumin was added. Plasma and samples from the quadriceps femoris muscle (percutaneous ...

1. Free amino acids were determined in the plasma and in the muscle tissue of 14 patients with chronic uraemia; eight were not on dialysis and six were having regular peritoneal dialysis. The concentration of each amino acid in muscle water was calculated with the chloride method. 2. In both groups of patients there were low intracellular concentrations of threonine, valine, tyrosine and carnos...

Amino acids are important sources of soil organic nitrogen (N), which is essential for plant nutrition, but detailed information about which amino acids predominant and whether amino acid composition varies with elevation is lacking. In this study, we hypothesized that the concentrations of amino acids in soil would increase and their composition would vary along the elevational gradient of Tai...

The proximate composition, amino acids and fatty acids composition in the muscle of wild, inshore and offshore cage-cultured large yellow croaker, Pseudosciaena crocea (Richardson, 1846), were determined to identify nutritional differences. Wild fish groups showed highest content of moisture and crude protein, but the lowest lipid content. Offshore cage-cultured fish showed significantly higher...

I. The changes occurring in the free amino acids of the plasma of laying hens in relation to egg formation have been investigated in fed and starved hens in three experiments, each with eight birds. 2. The mean concentrations of most amino acids and of the totals were higher at night than in the morning. 3. In general, egg formation was associated with increases in the concentrations of nonesse...

Free amino acids were kept at constant levels, and their alterations reflect the real state of energy metabolisms in the cells and living body. Neurotransmitters synthesized from certain amino acids fluctuated along with the current neuro-functional viability. Their content levels in each tissue give us substantial information about their state of health and disease in mammals. The determinatio...

The concentration of all free amino acids and many related compounds in the lens of rabbits has been determined by ion exchange chromatography, and the concentration of the amino acids in the lens has been compared with those found in a previous study in aqueous and. vitreous humors. The concentration of every free amino acid in the lens was shoiun to be higher than in the aqueous of the poster...