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Summary: One strain each of Xanthomonas campestris and “Xanthomonas phaseoli”, three strains of “Xanthomonas oryzae”, and five strains each of Escherichia coli and Klebsiella pneumoniae were found to produce a mixture of (1.2)-β-D-gluco-oligosaccharides and/or low-M r (1.2)-β-D-glucans in their culture media. The saccharides from the strains of Xanthomonas were all composed of unbranched, linear (1.2)-β-D-glucosaccharides with degrees of polymerization (DPs) of 8 to about 20, and a cyclic (1.2)-β-D-glucan (DP 16) containing one (1.6)-linkage and one α-linkage. The saccharides produced by the five strains of E. coli and four strains of K. pneumoniae were glucans with branches at O-6, and DPs of 10 to 15, whereas one strain of K. pneumoniae produced unbranched linear (1.2)-β-D-glucosaccharides with DPs of 6 to about 20.
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