On the Basis of Temperature Requirements, Psychrophilic or Cryophilic, Mesophilic, Thermophilic

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On the Basis of Temperature Requirements

Microbial growth is affected by temperature of the environment to a great degree. In this respect, the microbes can be classified as under:

(i) Psychrophilic or Cryophilic: Require sufficiently low temperature for their survival. Their best growth occurs at 0°C temperature as the minimum, 15-20°C as optimum and 30°C as maximum.

(ii) Mesophilic: Grow on moderate temperature; minimum optimum and maximum temperature limits are 15-25°C, 25-40°C and 50°C respectively.

(iii) Thermophilic: Grow at elevated temperatures lethal to many others. Their minimum temperature limit is 25-45°C; optimum as 45-55°C, and maximum limit is 55-85°C.

(iv) Thermotolerants or Thermoduric: Certain mesophilic are capable of withstanding high temperature, though they do not multiply at these elevated temperatures.

(v) Psychro or Cryotolerants : They are also called psychroduric or cryoduric. These are those mesophilic micro-organisms that can survive at very low temperatures but do not grow and multiply.

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