Ultrastructure of bacterial spines

Abstract
A marine bacterium produces appendages (spines) which consist of rigid tubes, about 70 nm in diameter. These are expanded at the base and attached to, but not originating in, the cell wall. The wall of the spine is smooth on the inside but ridged on the outside. The ridges, which appear as striations in shadowed or negative-stained preparations, are continuous along the length of the spine and helically arranged. The fine structure of these spines is demonstrated.

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