微生物学史微生物学史 (12).ppt
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1、Endospores-Sporulation&GerminationAfter learning this section,you should be able to:Describe in general terms the process of sporulation Describe the three stages that transform an endospore into an active vegetative cell Sporulation:Making Endospores Endospore-forming bacteria are common in soil,wh
2、ere they must be able to withstand fluctuating levels of nutrients.Sporulation(endospore formation)normally commences when growth ceases due to lack of nutrients.Thus it is a survival mechanism that allows the bacterium to produce a dormant cell that can survive until nutrients are again available a
3、nd vegetative growth can resume.These bacteria cycle between two states:vegetative growth and survival as an endospore.Vegetative growth is the normal,continuous cycle of growth and division.By contrast,sporulation is a complex process that occurs in a highly organized fashion over several hours.The
4、 mature endospore is located in a characteristic location in the mother cell(referred to as the sporangium),depending on the species of bacteria.Endospores may be centrally located,close to one end (subterminal),or terminal(figure 3.53).Sometimes an endospore is so large that it swells the sporangiu
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