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Azeotropic Data-III by Lee H. Horsley, Robert F. Gould

By Lee H. Horsley, Robert F. Gould

Azeotropic facts

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11). The tetrapeptide units have the general sequence: R - γ-D-glutamyl - R- - D-alanine The Rj residue is frequently L-alanine, or occasionally L-serine or glycine. Linked to the Rj residue is a γ-D-glutamyl residue, the α-carboxyl group of which may be substituted with an amide group (as in Staph. epidermidis) or linked by a peptide bond to a single glycine residue (as in Micrococcus lysodeikticus). The Ro residue can be a neutral amino acid such as homoserine, but it is more frequently a diamino acid such as L-ornithine, L-lysine, L,L-diaminopimelic acid or meso-diaminopimelic acid.

14. 14 Diagram showing two possible arrangements for the peptidoglycan chains and teichoic acid molecules in the walls of Staphylococcus lactis 13. (a) This shows the rigid peptidoglycan chains arranged radially with the teichoic acid molecules lying externally; (b) shows peptidoglycan lying parallel with the surface of the bacterium the other they lie parallel to the surface of the membrane. In any consideration of the arrangement of teichoic acids in walls, it must be remembered that teichoic acids are fairly long and flexible molecules which are held covalently at only one end.

The mannan in walls of Sacch. cerevisiae is also a branched polymer, with a backbone of ot-1,6-linked residues in which many, and possibly all, of the residues bear a side chain of 2-5 mannose residues joined by a-1,2 or a-1,3 linkages. About 10% of the mannan side chains have at their branch points two mannose residues joined by a phosphodiester linkage. The main problems which face the physiologist who wishes to research on the walls of Sacch. cerevisiae are the complex ways in which the wall polymers are joined together.

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