One dominant structure has been identified analysing the rotational spectrum of asparagine in sharp contrast with the multiconformational behaviour for other amino acids with polar side chains. This locking of the conformational variety to a single conformer has been ascribed to an intramolecular hydrogen bonding network involving α-amine, α-carboxylic and amide groups.

A simple and efficient synthesis of N-linked glycoamino acids and glycopeptides from deprotected sugars using the Staudinger reaction.

PERSPECTIVES AND SUMMARY .............................................................. 631 STRUCTURES OF ASPARAGINE-LINKED OLIGOSACCI-IARIDES .................... 632 ASSEMBLY AND TRANSFER OF THE LIPID-LINKED OLIGOSACCHARIDE ...... 635 Assembly ............................................................................................ 635 Transfer-Oligosaccharide Structural Requirements ........

background and objectives: the essential amino acid l-tryptophan can be produced by a condensation reaction between indole and l-serine, catalyzed by b. subtilis with tryptophan synthase activity. application of the tryptophan is widespread in the biotechnology domain and is sometimes added to feed products as a food fortifier. materials and methods: the optimum concentration of the iranian can...

the aim of this study was to investigate the effects of nigella sativa  (ns) fixed oil in comparison to dexamethasone (dex) on inducible nitric oxide synthase (inos), peripheral blood eosinophils (pbe), allergen specific serum igg1 and interleukins and airway inflammation in a murine model of allergic asthma. thirty-one mice were divided into four groups. group  i (n =  6) served as the control...

the product biofilm by e.coli strain can cause serious problem for human health. catheter is considered to be s suitable place for colonization of microorganisms, so that in %5-10 of patients who used catheter for only one day and also in all patients who used it for over 28 days, this colonization of bacteria is observed on catheter. this study is come out in order to compare biofilm formation...

coq10 and lycopene are isoprenoid compounds with nutraceutical and pharmaceutical benefits. in this study, the effect of concomitant lycopene biosynthesis on coq10 accumulation in transformed escherichia coli dh5α was studied. a lycopene production pathway including geranylgeranyl diphosphate synthase (crte), phytoene synthase (crtb), and phytoene desaturase (crti) from erwinia herbicola was co...

Affinity chromatography based on the complex formation of the modified nucleoside Q with boronic acid has been applied to the isolation of specific tRNA precursors containing this modified nucleoside. When [32P]RNA isolated from an Escherichia coli strain containing a thermolabile ribonuclease P was chromatographed on dihydroxyboryl-substituted cellulose, the precursors for asparagine, aspartat...

Bacto-Agar is a purified Agar prepared from domestic material. In the manufacture of Bacto-Agar extraneous matter, pigmented portions, and salts are reduced to a minimum, so that the finished product in the form of fine granules will dissolve rapidly, giving clear solutions. Bacto-Asparagine Bacto-Asparagine is a purified ao acid widely used in synthetic culture media and in the preparation of ...