Abstract
Secretion of exopolysaccharide by Rhizobium japonicum strain USDA 110 ws measured during growth on media comprising 12.5 mM MES [2-(N-morpholino)ethanesulfonic acid] buffer, pH 5.9; 5 mM NH4Cl; trace elements; and 25 or 100 mM of one of 23 different carbon sources. Significant amounts of exopolysaccharide were produced on all aldopentoses, polyols, organic acids, and sugar acids tested, but little or none was secreted during growth on aldohexoses or amino acids. Media suitable for routine slime-free culture of several. R. japonicum strains were made by using 100 mM d-galactose or 25 mM l-aspartate as the carbon source.
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