The effects of different @entity1568 and @entity505 sources on cell growth, pH, and exopolysaccharide (EPS) and @entity13099 ( @entity13100 ) production by two strains of @entity16258 (M5N1 and Su47) are reported. Differences in the behavior of @entity413 - and @entity948 -grown cells were shown, in particular with the M5N1 strain. Growth in a @entity413 -containing medium was accompanied by acidification of the culture medium, which leads to cell death. On @entity948 , acidification was detected only in the medium with a mineral @entity1568 supply. A lag phase in EPS production was observed with cells grown with @entity413 , probably related to an initial extracellular conversion of the @entity1735 into an acid. No lag phase was observed in EPS production from @entity948 or in @entity13100 synthesis whatever the @entity505 source. A decrease in @entity13100 content was noticed for both strains under conditions where acidification of media occurred. The extent of production, emphasized by the use of a coproduction index, indicates that the M5N1 strain is a more promising organism than is the Su47 strain for polymer production. Such a strain, put in rich medium (containing @entity375 extract) supplemented with @entity948 , accumulated @entity13100 up to 85% of dry cell weight and excreted about 1.5 g of EPS per liter in the medium. Regulation of the coproduction of EPS and @entity13100 by these cells is suggested.

Exopolysaccharide and @entity13099 Coproduction in Two XXXX Strains.

@entity1568 :: ('MESH:D009584', 'Chemical') :: ['nitrogen'] @entity13099 :: ('MESH:C003182', 'Chemical') :: ['poly-(beta)-hydroxybutyrate'] @entity948 :: ('MESH:D005632', 'Chemical') :: ['fructose'] @entity13100 :: ('CHEBI:53388', 'Chemical') :: ['PHB'] @entity1735 :: ('CHEBI:16646', 'Chemical') :: ['carbohydrate'] @entity505 :: ('MESH:D002244', 'Chemical') :: ['carbon'] @entity375 :: ('4932', 'Species') :: ['yeast'] @entity413 :: ('MESH:D005947', 'Chemical') :: ['glucose'] @entity16258 :: ('382', 'Species') :: ['Rhizobium meliloti']
@entity16258 :: (382,Species) :: ['Rhizobium meliloti']
