A Role of Intracellular Polysaccharide in the Sporulation of "Bacillus Cereus"

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dc.contributor.author Schmid, Steven MacKay
dc.date.accessioned 2008-04-29T15:12:46Z
dc.date.available 2008-04-29T15:12:46Z
dc.date.issued 1980-05
dc.identifier.other 1980 .Sch52
dc.identifier.uri http://hdl.handle.net/2092/739
dc.description 40 leaves. Advisor: Dean A. Hoganson en
dc.description.abstract The problem. "Bacillus cereus" accumulates an intracellular polysaccharide under conditions of nutritional stress. The polysaccharide is then degraded as the organism begins sporulation. This study concerns intracellular polysaccharide and its possible involvement in sporulation as a source of carbon and energy. Procedures. Ethyl methanesulphonate mutagenized cells of "Bacillus cereus" 10702 were screened for the ability to accumulate glucose during growth with glucostat reagent. Glucose deficient mutants were assayed for the ability to accumulate poly-B-hydroxybutyric acid and intracellular polysaccharide followed by comparison to wild type levels. Endotrophic sporulation capabilities with exogenous glucose were determined by the heat resistance of spores in both mutant and wild type. Dipicolinic acid levels in spores were assayed with modified Janssen reagent. Findings. A mutant of "Bacillus cereus" strain T isolated was deficient in the ability to accumulate intracellular polysaccharide. The mutant produced low levels of heat sensitive spores. Heat sensitivity was dependent upon poly-B-hydroxybutyric acid accumulation and levels of exogenous glucose during sporulation. Inhibition of poly-B-hydroxybutyric acid accumulation increased heat resistance of spores subjected to sporulation in low levels of glucose and CaCl2. Conclusions. The data indicated that intracellular polysaccharide supplied the sporulation process with a carbon and/or energy source involved in spore formation and heat resistance. en
dc.format.extent 2097291 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.publisher Drake University en
dc.relation.ispartofseries Drake University, School of Graduate Studies;1980
dc.subject Biology en
dc.subject Bacillus cereus en
dc.title A Role of Intracellular Polysaccharide in the Sporulation of "Bacillus Cereus" en
dc.type Thesis en

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