Structural and physiological characteristics of some sheathed bacteria

Abstract
The fine structure and growth of two gram-negative and two gram-positive strains of sheathed bacteria, isolated from activated sludge, have been studied. Their anatomy is quite different fromSphaerotilus natans. The cells are rectangular, tightly joined together, non-motile and enclosed by a sheath which is thin in the gram-negative strains and rather electron-dense in the two larger gram-positive strains. The four strains grow slowly and form pink filamentous flocs in liquid media.

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