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SUMMARY Rhodospirillum rubrum was investigated electronmicroscopically after freeze- etching. Indentations on the convex faces of cytoplasmic membranes and protuber- ances on the concave faces were interpreted to represent sites of invaginations for intracytoplasmic membranes. The number of such invagination sites/,um2 of membrane face increased as the cellular bacteriochlorophyll content increased, but no defined proportionality between these parameters could be established.

Quantitative Determination of Cytoplasmic Membrane Invaginations in Phototrophically Growing Rhodospirillum rubrum. A Freeze-etch Study