Single amino acids were found to be highly toxic to protoplast-derived cells of tobacco (Nicotiana tabacum cv Xanthi) cultured at low density in a culture medium containing a low naphthaleneacetic acid concentration (0.05 micromolar). The cytotoxicities of alanine, aspartic acid, asparagine, glutamic acid, glutamine, glycine, lysine, proline, and valine were reduced when the naphthaleneacetic a...

in current study, protein hydrolysates were produced using microbial proteases of alcalase, protamex and flavourzyme from yellowfin tuna viscera. the results indicated that, protein hydrolysate from alcalase, had significantly higher protein content, nitrogen recovery and degree of hydrolysis than the others (p 0.05). the results of amino acids composition revealed that all hydrolysates were al...

A commercial hydrolysate of casein stimulated production of lysine decarboxylase (EC 4.1.1.18) by Escherichia coli B. Cellulose and gel chromatography of this hydrolysate yielded peptides which were variably effective in this stimulation. Replacement of individual, stimulatory peptides by equivalent amino acids duplicated the enzyme levels attained with those peptides. There was no indication o...

The present study analyses changes in nitrogen compounds, amino acid composition, and glutamate metabolism in the resurrection plant Sporobolus stapfianus during dehydration stress. Results showed that older leaves (OL) were desiccation-sensitive whereas younger leaves (YL) were desiccation-tolerant. OL lost their soluble protein more rapidly, and to a larger extent than YL. Enzymes of primary ...

The proximate, mineral composition and amino acid profile of the body parts of Macrobrachium vollenhovenii (African river prawn) and Tympanotonus fuscatus (tropical periwinkle) were determined. The length and weight of the prawns varied from 15cm to 17.6cm and 72.76g to 130.65g respectively while the length and weight of the periwinkles varied from 22.72mm to 54.72mm and 1.53g to 7.59g respecti...

the impact of pgf2? on total proteins, free amino acids and the amino transferases in the gonads of silkworm, bombyx mori l. were investigated in the present experiment. the effect of pgf2? resulted in increase in the total protein and free amino acid contents in the gonads of silkworm larvae indicating improved structural and dynamic levels of organization. the enhanced activity levels of amin...

the aim of this study was to investigate the processing methods of sorghum grain and diet formulation on performance and nutrients digestibility in broilers. three hundred and twenty chicks at eight day of age were allotted into eight groups of four replicate with ten chicks per replicate. this research was conducted as completely randomized design arranged in a 2 × 2 × 2 factorial experiment u...

We have prepared a small library of amphiphiles, each comprising a polar carbohydrate head group attached through an N-terminal amino acid to a nonpolar pyrene tail group. One of these derivatives is sensitive to the presence of insulin in aqueous media.