The monosaccharides constituents of the walls of
Rhodopseudomonas spheroides grown under light-anaerobic and dark-aerobic conditions were studied.
The light-anaerobic walls contained glucose (1.5%), ribose (0.8%), methylpentoses (rhamnose and fucose) (5.0%, as rhamnose) and aminosugar (as glucosamine) (2.3%, by Dische-Borenfreund reaction; 3.4%, by Elson-Morgan reaction). On the other hand, glucose (0.6%), ribose (0.7%), methylpentoses (rhamnose and fucose) (5.3%, as rhamnose) and aminosugar (as glucosamine) (2.1%, by Dische-Borenfreund reaction; 4.2%, by Elson-Morgan reaction) were also found in the dark-aerobic walls.
Sialic acid, uronic acid, heptose, 2-deoxyaldose and 3-deoxyaldose were not detected in the walls.
Acknowledgement The present authors were indebted to Prof. G. Kikuchi for supply of the walls of
R. spheroides, for which and for his encouragementthroughout this work, they wish to express their acknowledgement.
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