name the condition that help in growth of microorganism in food
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The growth of microorganisms is a highly complex and coordinated process, ultimately expressed by increase in cell number or cell mass. The process of growth depends on the availability of requisite nutrients and their transport into the cells, and the environmental factors such as aeration, O2 supply, temperature and pH.
Doubling time refers to the time period required for doubling the weight of the biomass while generation time represents the period for doubling the cell numbers. Doubling times normally increase with increasing cell size and complicity as given below.
Bacteria 0.30 – 1 hour
Yeasts 1 – 2 hours
Animal cells 25 -48 hours
Plant cells 20 -70 hours
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Various microorganisms require for growth, either high oxygen tension (aerobic), low oxygen tension (microaerobic) or absence of oxygen (anaerobic). Some microorganisms may grow either in high oxygen tension, or in the absence of oxygen (facultative anaerobes).
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