The diazotrophic endophyte Herbaspirillum seropedicae Z78 was shown to possess a capsule con taining two high molecular weight glycolipids, one of which was of a lipopolysaccharide nature. These gly colipids differed considerably in the fatty acid composition of their lipid components. The polysaccharide moiety of these glycans was composed of glucose, galactose, glucosamine, galactosamine, and a noncarbo hydrate component, butanetetraol. In the culture liquid of H. seropedicae Z78, an extracellular polysaccha ride and an extracellular form of lipopolysaccharide were revealed. Fatty acid composition of the extracellular lipopolysaccharide differed from that of the capsular glycoconjugates; the polysaccharide moiety of exogly cans contained only neutral sugars (mannose, glucose, and galactose) and a tetraatomic alcohol, butanetet raol. It is assumed that structural diversity of polysaccharide containing polymers at the surface of H. serope dicae Z78 cells is conditioned by their different roles in plant colonization and formation of efficient symbi osis.
The present paper reports for the first time the transformation of an organic selenium compound into red selenium (Se), which causes the intense red pigmentation of Lentinula edodes (shiitake mushroom) mycelia. The biotransformation of 1,5-diphenyl-3-selenopentanedione-1,5 (diacetophenonyl selenide, preparation DAPS-25) was studied in liquid- and solid-phase cultures of L. edodes. In liquid culture medium, a red color develops in the mycelium at initial DAPS-25 concentrations equal to or higher than 0.1 mmol/l. The intensity and initiation time of coloration is Se concentration-dependent. Semiquantitative data obtained by physicochemical methods on the extent of Se and acetophenone production suggest that L. edodes is able to absorb and/or destruct this organic Se xenobiotic.
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