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1. (Article ID: 1935)
 
Morris VJ, Brownsey GJ, Gunning AP, Harris JE
Gelation of the extracellular polysaccharide produced by Agrobacterium rhizogenes
Carbohydrate Polymers 13 (1990) 221-225
 

It has been shown that the extracellular polysaccharide (EPS) produced by Agrobacterium rhizogenes will form thermoreversible gels. This EPS belongs to a family of polysaccharide structures all of which have the same backbone structure substituted with different side chains. The EPS produced by Rhizobium meliloti IFO 13336 also belongs to this family of structures and T. Harada (Biochem. Soc. Symp., 48 (1983) 97) has reported gelation of this polysaccharide. Thus it is possible that gelation is a common feature of this family of structures. Possible biological and ecological consequences of gelation are discussed.

structure, Rhizobium, Rhizobium leguminosarum, Agrobacterium, extracellular polysaccharides, ecological, gelation

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2. (Article ID: 3105)
 
Hisamatsu M
Cyclic (1 → 2)-β-D-glucans (cyclosophorans) produced by Agrobacterium and Rhizobium species
Carbohydrate Research 231 (1992) 137-146
 

Neutral and acidic cyclic (1→2)-β-D-glucans (cyclosophorans), obtained from culture filtrates and cells of Agrobacterium and Rhizobiun, are synthesised on the cell surface and then secreted. Eight cyclosophorans with dp 17-24 were isolated; all of the strains of Agrobacterium showed almost the same distribution pattern, whereas there were three other distribution patterns for the strains of Rhizobium.

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