in order to study the effects of ascorbic acid as an important antioxidant reducing salinity damage, an experiment was conducted on two althernantera genotypes (“entire leaf” and “undulated leaf”) at research greenhouse of shahid chamran university in 2013. concentrations of 0, 0.5 and 1 mm of ascorbic acid were sprayed weekly on plants grown under 0, 30, 60, 90 mm nacl. the experiment was carr...

1. It has been experimentally shown that breaking of the pyrrolidine ring of proline by nitrous acid is not a factor of sufficient magnitude to account for the amino nitrogen which is usually found in proline preparations. 2. A method for the preparation of racemic proline is described. The product was found to be free from amino nitrogen. 3. The dissociation constants of racemic proline and of...

Stress-induced proline accumulation in plants is thought to result primarily from enhanced proline biosynthesis and decreased proline degradation. To identify regulatory components involved in proline transport, we screened for Arabidopsis thaliana T-DNA mutants with enhanced tolerance to toxic levels of exogenous proline (45 mM). We isolated the proline resistant 1-1 (pre1-1) mutant and map-ba...

among the environmental stresses, salinity is a major limiting factor in world legumes production is considered. in this study, sodium chloride and salicylic acid interaction on growth parameters were investigated in greenhouse with factorial arrangement in randomized complete block design with three replications. the plant consisted of three cultivars of lentil (kimiya, kermanshah and gachsara...

Proline is an anomalous amino acid. Its nitrogen atom is covalently locked within a ring, thus it is the only proteinogenic amino acid with a constrained phi angle. Sequences of three consecutive prolines can fold into polyproline helices, structures that join alpha helices and beta pleats as architectural motifs in protein configuration. Triproline helices are participants in protein-protein s...

Nucleotide composition, codon usage and amino acid content are important molecular signatures that vary in different groups of organisms. AT-rich (or GC poor) hyperthermophiles have relatively been unexplored in these aspects. In this study, we have examined the compositional characteristics of AT rich genomes viz. Methanococcus jannaschii, Sulfolobus solfataricus, Sulfolobus tokodaii and Nanoa...

The simplification of amino acid content distribution under the influence of the strong mutational pressure takes place in simplex and varicello viruses proteins coded by genes with GC-content higher than 60%. We proved this statement by the way of in-silico calculation of Shannon’s entropy of amino acid content distribution in all proteins from ten completely sequenced simplex and varicello vi...

traditional raw milk cheese is one of the most consuming cheeses in the world. kurdish cheese is a semi-firm, traditionally made in the east of iran. it is manufactured from raw sheep or cow milk and kept in goat’s skin bags during ripening period. as a result kurdish cheese is often more complex in different varieties of microorganisms, which whose organoleptic properties make it highly esteem...

Residue-specific bioincorporation of 1,3thiazolidine-4-carboxylic acid [thiaproline, Pro(S)], a nonnatural amino acid analog of proline, into human recombinant annexin V was achieved with a proline-auxotrophic Escherichia coli strain by fermentation procedures in minimal medium. Quantitative replacement of proline with thiaproline was confirmed by mass-spectrometric, amino acid, and x-ray cryst...