@article{mbs:/content/journal/micro/10.1099/00221287-61-2-219, author = "Whittenbury, R. and Davies, Stephanie L. and Davey, J. F.", title = "Exospores and Cysts Formed by Methane-utilizing Bacteria", journal= "Microbiology", year = "1970", volume = "61", number = "2", pages = "219-226", doi = "https://doi.org/10.1099/00221287-61-2-219", url = "https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-61-2-219", publisher = "Microbiology Society", issn = "1465-2080", type = "Journal Article", abstract = "SUMMERY: Three varieties of resting stage, an exospore and two types of cyst, were formed by methane-utilizing bacteria. Exospores were budded off by two types of organism, both of which underwent a change in morphology prior to spore formation. Exospores possessed some properties in common with endospores: staining properties, some structural features, mode of germination, desiccation and heat resistance, but contained no detectable dipicolinic acid. Some organisms formed desiccation-resistant cysts similar in morphology, staining properties and fine structure to cysts formed by Azotobacter species. Other strains formed non-desiccation-resistant bodies considered to be similar to immature azotobacter-type cysts. A desiccation-resistant cyst formed by one strain differed in structure and appearance from Azotobacter-type cysts and was referred to as a Tipid’ cyst.", }