Microbial Growth: Physical Requirements

tolerate cold, doesn't like it, but can survive0 to 30 degrees C

• psychrophiles

• psychrotrophs

• mesophiles

• thermophiles

optimum temp is body temperature10 to 50 degrees C

• psychrophiles

• psychrotrophs

• mesophiles

• thermophiles

heat loving (usually archaea)40 to about 70 degrees C

• psychrophiles

• thermophiles

• mesophiles

• psychrotrophs

heat loving (hot springs)about 65 to 110 degrees C

• hyperthermophiles

• mesophiles

• psychrotrophs

• psychrophiles

grow at very low pH

• acidophiles

• alkaliphiles

• neutrophiles

• halophiles

Grow at pH 5.4 to 8.5.

• Acidophiles

• Neutrophiles:

• Alkaliphiles

Grow at alkaline or high pH (7 to 12 or higher)

• Acidophiles

• Neutrophiles

• Alkaliphiles

physical requirements:

• pH

• Osmotic Pressure

• Temperature

• Trace Elements

Require moderate to large salt concentrations.

• Halophiles

• acidophiles

• Neutrophiles:

• Alkaliphiles

TOLERATE high osmotic pressure

• facultative halophiles

• Obligate Halophiles

• Halophiles