bio living_conditions_for_bacteria_12_10_08

bio living_conditions_for_bacteria_12_10_08 - plasmolosis...

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- Temperatures o Minimum Below causes inactivation of enzymes o Optimum Best temperature to grow Closer to the maximum o Maximum Highest temperature to still have growth Any higher causes denaturation o Changes in membranes or proteins determine what the best growth temperature is o Psychrophiles Cold o Psychrotrophs o Mesophiles Our temperature o Thermophiles hot o Extreme thermophiles - Oxygen o Obligate aerobes High O2 requirement 21% (normal air) o Microaerophiles 2-10% O2 needed
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o Facultative anaerobe Can grow with or without oxygen Grows better with oxygen o Obligate anaerobe Cannot live in oxygen o Harmful effects of oxygen Production of toxins H2O2 Hydroxyl groups Superoxide radical 0 -2 Aerobes have Catalase and other enzymes to get rid of these things o Phagocytes make these toxins to help kill cells - pH o most organisms like it neutral o more organisms can grow at low pH than high pH o can be used to isolate organisms selectively - osmotic gradients o hypertonic cell has a lot of pressure
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Unformatted text preview: plasmolosis cell loses fluids due to wall bursting from pressure o isotonic cell pressure= outer pressure o hypotonic less pressure in cell fluid more likely to enter the cell-water activity o water available in the environment for growth o most bacteria need a water activity of .9 thats why dry foods and preservatives take a long time to spoil-salt activity o halophiles can survive in salt staphylococcus o extreme halophiles archae bacteria-metabolism o anabolic reactions building up o catabolic breaking down releases energy can be used to synthesize ATP o amphibolic builds and breaks o glucose, lipids, proteins glycolysis 2 atp Acetyl CoA Krebs cycle 2 atp Electron transport chain Proton gradient o pH gradient o Oxidative phosphorylation o 10 NAD 3 ATP/NAD 30 ATP o 2 FAD 2 ATP/FAD 4 ATP Total 38 ATP...
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This note was uploaded on 01/27/2012 for the course BIO 1430 taught by Professor Dharmasiri during the Fall '08 term at Texas State.

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bio living_conditions_for_bacteria_12_10_08 - plasmolosis...

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