Microbial_growth

Microbial_growth - M icrobialGrowth I Growthforbacteria A (Fig.4.1 1 . 2 3 Resultsinexpo

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I. Growth for bacteria A. Prokaryotic Binary fission (Fig. 4.1) 1. One cell divides into two daughter cells. Must replicate its chromosome during division. 2. Generation or doubling time- the time it takes for a cell to reproduce under optimal conditions. 3. Results in exponential growth. B. Growth Curve (Figure 4.6) 1. In experimental conditions with nutrient broth cultures where nutrients aren’t added or waste products removed. a. Lag phase       – when the bacteria is trying to establish itself – maybe after being in a freezer or something of the sort b. Log phase       – also called the exponential phase – when the bacteria feeds and grows once it has established itself –  the primary metabolites are made here c. Stationary phase       – when food runs out – basically they are adjusting to try to survive with little food – the  organisms are growing and dying at the same rate. During this phase, secondary metabolites start growing and  killing the primary metabolites.  Secondary metabolites make antibiotics d. Death phase       – When the average organisms start dying. The population decreases e. Prolonged decline (Fig. 4.8)      –  contain the toughest organisms that have learned how to survive 2. Cells synthesize primary metabolites during log phase that allows them to grow more rapidly, such as amino acids,  peptidoglycan and nucleic acids. Cells synthesize secondary metabolites that allow them to become better competitors  during stationary phase. (Fig. 4.7). C.
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This note was uploaded on 03/28/2010 for the course MCRO 251 taught by Professor Lorrainecramer during the Fall '09 term at UNC.

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Microbial_growth - M icrobialGrowth I Growthforbacteria A (Fig.4.1 1 . 2 3 Resultsinexpo

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