. Oxygen . PH . Salinity . Pressure . Light radiation
1. Nutrition The following nutrients must be provided for optimal bacterial growth.
Hydrogen donors and acceptors
Minerals: sulfur and phosphorus, trace elements
Growth factors: amino acids, purines, pyrimidines and vitamins.
Temperature tolerance range: The minimum and maximum temperature at which a micro-organism can grow; which is different in different species of bacteria. Optimal growth range of temperature: The temperature at which the maximum growth rate occurs; and results in the shortest generation time of bacteria. Based on different optimal growth temperature requirement, bacteria are divided into: