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By Peter L. Gray

Moment Library replica. San Diego Air and house Museum.

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If problems occur with thixotropy or high 50 ANALYTICAL METHODS [4] viscosity, mechanical agitation or mild sonification is useful. Even with solutions of high viscosity acceptable spectra are obtained, providing a rigid tertiary structure is not formed. In extreme cases of low solubility, D20 at pD 14 has been found to be extremely useful; in these cases the addition of a trace of sodium borohydride assists in minimizing degradation. Under these conditions resonances are usually narrower, and better resolution of sequence-specific chemical shift differences can be ascertained (Fig.

This could lead to considerable "underoxidation" but may easily be avoided by subjecting the polyalcohol to another oxidation-reduction sequence. When the nonoxidizable residues are linked to each other, a polymeric backbone is obtained by this degradation. When a nonoxidizable sugar residue is isolated, for instance as in 39a or 39b, a glycoside (41) is obtained on mild acid hydrolysis of the intermediate polyalcohol (40). The aglycon in this glycoside derives from the adjacent sugar residue and indicates the nature and mode of substitution of this residue.

Soc. 96, 8081 (1974). 4 D. E. Dorman and J. D. Roberts, J. A m . Chem. Soc. 92, 1355 (1970). A. S. Perlin, B. Casu, and H. J. Koch, Can. J. Chem. 48, 2596 (1970). H. J. Koch and A. S. Perlin, Carbohydr. Res. 15,403 (1970). 7 p. A. J. Gorin, Can. J. Chem. 52, 458 (1974). D. R. Bundle, H. Jennings, and I. C. P. Smith, Can. J. Chem. 51, 3812 (1973). 9 T. E. Walker, R. E. London, T. W. Whaley, R. Barker, and N. A. Matwiyoff, J. A m . Chem. Soc. 98, 5807 (1976). [3] POLYSACCHARIDE STRUCTURES USING laG N M R 41 resonances of the molecule due to scalar carbon-carbon coupling.

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Aircraft Profile No. 9: The Albatros D V by Peter L. Gray

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