50 research outputs found
Peptide bond formation in gas-phase ion-molecule reactions of amino acids: a novel proposal for the synthesis of prebiotic oligopeptides.
A metastable ion and collision-induced dissociaiton study of the (M-C2H4).+ ion from 3-phenyl-1-bromopropane.
A study of the applicability of various ionization methods and tandem mass spectrometry in the analyses of triphenyltin compounds
A metastable ion and collision-induced dissociaiton study of the (M-C2H4).+ ion from 3-phenyl-1-bromopropane.
Re-examination of cellular cyclic ß-1,2-glucans of Rhizobiaceae: Distribution of ring sizes and degrees of glycerol-1-phosphate substitution.
Gel-filtration and thin layer chromatography of low molecular weight carbohydrates from culture filtrates of Agrobacterium radiobacter, Isolate II, have shown, that next to the neutral beta-1,2-glucan fraction a major acidic fraction was present which was found to be glycerophosphorylated cyclic beta-1,2-glucans. Re-examination of cyclic beta-1,2-glucan preparations which had been obtained by extraction of Rhizobium cells with hot phenol-water also showed these acidic modified beta-1,2-glucans to be present. Cyclic beta-1,2-glucans from R. leguminosarum (9 strains) and of R. phaseoli (1 strain) had ring size distribution with degrees of polymerisation (DPs) of 19 and 20 as major ring sizes of which a minor part was glycerophosphorylated; beta-1,2-glucans of R. trifolii (3 strains) had ring sizes with DPs measuring 19-22 as prominent components which were largely unsubstituted, and R. meliloti (7 strains) had beta-1,2-glucans with ring size distributions extending to still higher DPs of 19-25 of which the major part appeared to be glycerophosphorylated