Abstract
Socolofsky, M. D. (University of Texas, Austin) and Orville Wyss. Resistance of the Azotobacter cyst. J. Bacteriol. 84:119–124. 1962—The Azotobacter cysts were found to be more resistant than the vegetative cells to various harmful agents. Studies involving ultraviolet irradiation indicated that cysts required twice as great a dosage, as correspondingly treated vegetative cells, to be 90% inactivated. The acquisition of ultraviolet resistance during the encystment process was gradual and appeared to be related to the formation of exine and intine. A slow loss of ultraviolet resistance during germination was also noted. The cysts exhibited no marked resistance to heat, although they were extremely resistant to gamma radiation, sonic treatment, and desiccation. Evidence was presented indicating that the cyst is not a bacterial endospore. The encystment process may confer a survival advantage upon the organism by coupling the low endogenous respiration rate with the ability to withstand desiccation.
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- BISSET K. A. Evidence from the cytology of Azotobacter chroococcum of a relationship with Rhizobium and the Bacillaceae. J Gen Microbiol. 1955 Dec;13(3):442–445. doi: 10.1099/00221287-13-3-442. [DOI] [PubMed] [Google Scholar]
- Dubos R. J. THE DECOMPOSITION OF CELLULOSE BY AEROBIC BACTERIA. J Bacteriol. 1928 Apr;15(4):223–234. doi: 10.1128/jb.15.4.223-234.1928. [DOI] [PMC free article] [PubMed] [Google Scholar]
- ROMIG W. R., WYSS O. Some effects of ultraviolet radiation of sporulating cultures of Bacillus cereus. J Bacteriol. 1957 Sep;74(3):386–391. doi: 10.1128/jb.74.3.386-391.1957. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Rode L. J., Foster J. W. MECHANICAL GERMINATION OF BACTERIAL SPORES. Proc Natl Acad Sci U S A. 1960 Jan;46(1):118–128. doi: 10.1073/pnas.46.1.118. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Socolofsky M. D., Wyss O. CYSTS OF AZOTOBACTER. J Bacteriol. 1961 Jun;81(6):946–954. doi: 10.1128/jb.81.6.946-954.1961. [DOI] [PMC free article] [PubMed] [Google Scholar]
- WYSS O., NEUMNN M. G., SOCOLOFSKY M. D. Development and germination of the Azotobacter cyst. J Biophys Biochem Cytol. 1961 Aug;10:555–565. doi: 10.1083/jcb.10.4.555. [DOI] [PMC free article] [PubMed] [Google Scholar]