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. 1972 Mar;109(3):1191–1197. doi: 10.1128/jb.109.3.1191-1197.1972

Freeze-Etching of Azotobacter vinelandii: Examination of Wall, Exine, and Vesicles

Gerald D Cagle 1, G R Vela 1, Robert M Pfister 1
PMCID: PMC247343  PMID: 4334764

Abstract

The structure of the cell wall, the arrangement of the cyst exine, and the origin and distribution of intine vesicles in Azotobacter vinelandii ATCC 12837 were examined by freeze-etching and conventional electron microscopic techniques. In the vegetative organism the cell wall appears to have a woven texture which disappears during cyst formation. The exine is composed of two different types of material: the outer layer is a fibrous, amorphous layer, and the numerous inner layers form the basic hexagonal structures which unite to form the cyst coat. The presence of intine vesicles in the encysting organism was confirmed in frozen-etched cells. The appearance of frozen-etched cells and cysts and the distribution of capsular material indicate that extracellular polysaccharide is an important factor in cyst formation.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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