Classification of Bacteria based on Environmental factors

Classification of Bacteria based on Environmental factors;

Psychrophiles – Bacteria which grow at a temperature of 0- 20°C with an optimum at 15°C. eg. Pseudomonas.

Mesophiles – Bacteria which survive at a temperature of 20- 45°C with an optimum growth at 30 – 37°C. eg. Salmonella typhi.

Thermophiles – Bacteria which survive at a temperature of 45- 90°C with an optimum growth at 55°C. eg. Clostridium botulinum.

Halophilic – Bacteria which grow best in the presence of salt. eg. Serratea salinaria.

Halophobic – Bacteria which cannot tolerate salt concentrations higher than 6%. eg. Achromobacter, Pseudomonas.

Acidophiles – Bacteria which can survive at a pH of 4.5 and below. eg. Lactic acid bacteria.

Aerobic – Bacteria which grow only in the presence of air. eg. Salmonella typhi.

Anaerobic – Bacteria which grow only in the absence of oxygen eg. Clostridium sp.

Autotrophs – Bacteria which can synthesis their own food material. eg. Green sulphur bacteria.

Heterotrophs – Bacteria which depends on others for their food. eg. Vibrio cholera.

 

Sumber:

FISH PROCESSING TECHNOLOGY (2005)

State Council of Educational Research & Training (SCERT)

Vidyabhavan, Poojappura, Thriuvananthapuram-12, Kerala

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