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Unformatted text preview: most bacteria must be grown in media with high water and low solute content. High levels of salt or sugar can be used for food preservation. There are some exceptions to this: Extreme halophilestolerate very high salt concentrations Obligate halophilesactually require an extremely high salt concentration for growth, possibly up to 30% salt Facultative halophilescan grow at salt concentrations up to 2%, but do not require them. A few of these can even tolerate 15% salt. Although bacteria frequently find themselves in surroundings with a lower osmotic pressure than that inside the cell, the cell wall usually prevents excessive water from entering the cell. If osmotic pressure of a solution is extremely low, such as pure distilled water, some microbes might be damaged....
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- Fall '09