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- W2039532321 abstract "Chemical mutagenesis has been used to produce mutants of Acetobacter xylinum NRRL B42 that are cellulose-negative and that produce variants of the acetan structure deficient in the side-chain sugar residues. The product of A. xylinum strain CR1/4 has been shown to possess a tetrasaccharide repeat unit with the side chain terminating in glucuronic acid. X-ray diffraction studies of oriented fibres suggest that the polysaccharide CR1/4 forms a fivefold helix with a pitch of 4.8 nm. Light-scattering studies on CR1/4 solutions suggest a molecular weight of 1.2 × 106 with radii of gyration values of 86 nm (aqueous solution) and 67 nm (0.1 m NaCl solution). The magnitude of the measured radii of gyration and the shape of the Holtzer plots suggest that CR1/4 can be described as a stiff coil. Preliminary differential scanning calorimetry data show melting behaviour consistent with order-disorder transitions of a charged helical structure. Rheological studies have revealed new synergistic interactions of CR1/4 with locus bean gum. Comparative studies of acetan and CR1/4 show that decreasing the length of the side chain enhances the solution viscosity." @default.
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- W2039532321 date "1994-12-01" @default.
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- W2039532321 title "Physicochemical characterization of an acetan variant secreted by Acetobacter xylinum strain CR1/4" @default.
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- W2039532321 doi "https://doi.org/10.1016/0141-8130(94)90064-7" @default.
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