Objective: Many methods can be found in literature for the synthesis a Oxazines and Thiazines. Few are reported one-pot multi component cyclo-condensation of an alkayane urea / Thiourea Aldehyde to 2- amino-4H-1, 3-Oxazines or Different catalysts like Trifluoro-acetic acid, glacial acetic acid under reflux condition Mandal Co-workers have utilized perchloric (HClO4) supported on silica gel as c...

Somatic embryogenesis has been accomplished from tender leaf base explant of date palm (Phoenix dactylifera L.). Three to five mm long tender leaf base explants derived from the meristamatic region of 2-3 year old offshoots of date palm cv. Kheneizi were cultured on Murashige and Skoog (MS) basal medium supplemented with 10, 50, 100 and 150 mg l 2,4-dichlorophenoxy acetic acid (2,4-D) and incub...

A simple and efficient protocol for in vitro shoot and callus induction was established from three different explants of Canavalia gladiata (Jacq.) DC. an economically important legume. The explants viz., shoot buds, nodes, internodes were cultured in MS medium supplemented with various concentration and combination of (PGRs) Plant growth regulators 6-benzyl amino purine (BAP) (0.5mg/L – 1.5mg/...

The following paper contains an account of further experiments on the reaction occurring between amino acids and a mixture of pyridine and acetic anhydride. It may be recalled that it was shown in our first paper (1) that a typical a-amino acid on being warmed with acetic anhydride and pyridine was converted into an acetylaminoacetone derivative with evolution of carbon dioxide. A P-ketonic aci...

Abbreviations: ACC: 1-Amino-cyclopropane-1-carboxylic acid ADC: arginine decarboxylase AgNO3: silver nitrate AVG: aminoethoxyvinylglycine BA: 6-benzylaminopurine DFMA: α-DL-difluromethyl arginine DFMO: α-DL-difluromethyl ornithine IAA: indole acetic acid NAA: α-naphthalene acetic acid ODC: ornithine decarboxylase PA: polyamine Put: putrescine SAM: S-adenosyl-Lmethionine STS: silver thiosulphate...

The deboronation of enantiomers planar-chiral benzyl (3-formamido-1,2-dicarba-closo-dodecaboran-1-yl)acetate gave the individual (RP)- and (SP)-enantiomers (ee > 98%) a new amino acid containing nido-carborane fragment, (3-ammonio-7,8-dicarba-nido-undecaboran-7-yl)acetic acid. Chiral HPLC methods for analysis enantiomeric purity this compound was developed.

In two experiments we evaluated the effect of water and acetic acid soaking on ME, apparent amino acid (AA) availability, and true AA availability of vetch (V) and ervil (E) seeds. In Experiment 1, the feedstuffs were untreated (U) V or coarsely ground V soaked in water (1:10, wt/vol) at 40 C for 72 h with a water change every 12 h (40WV), vetch soaked in 1% acetic acid for 24 h at 40 C (40AAV)...

GAR transformylase, which is responsible for the incorporation of formate carbon into what becomes position 8 of the purine ring, has been completely separated from 5-amino-4-imidazolecarboxamide ribotide transformylase (3). The latter enzyme is responsible for the incorporation of formate carbon into position 2 of the purine ring. The requirement for folic acid compounds has been demonstrated ...

A bacterium, Ochrobactrum anthropi, produced a large amount of a nucleosidase when cultivated with purine nucleosides. The nucleosidase was purified to homogeneity. The enzyme has a molecular weight of about 170,000 and consists of four identical subunits. It specifically catalyzes the irreversible N-riboside hydrolysis of purine nucleosides, the K(m) values being 11.8 to 56.3 microM. The optim...

Xanthine (I) is converted to carbon dioxide, formic acid, glycine, and ammonia by crude extracts of Clostridium acidi-urici (1) and Clostridium cylindrosporum (2). Conditions under which an intermediate in this process is accumulated in incubation mixtures of xanthine and the crude extract were described in Paper III of this series (3). The compound was identified as 4-amino-5-imidazolecarboxyl...