in Microbes in Human Welfare by

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The main characteristics of Azotobacter are:

  1. Azotobacter is a polymorphic gram negative bacteria.
  2. The young cells of the bacteria possess peritrichous flagella which functions as locomotive organs.
  3. Most of the species of Azotobacter are very sensitive to acidic pH, salts and temperature.
  4. Optimum range of temperature is between 20°C and 30°C.
  5. The thick walled cysts are also formed.