Micro 2010

Cold-loving bacteria.Growth temperature is between -5C and 15C. They are usually found in the Arctic and Antarctic regions.

Grow best at moderate temperatures. Their optimum growth temperature is between 25C and 45C. Most bacteria are mesophilic and include common soil bacteria and bacteria that live in and on the body.

Thermophiles are heat-loving bacteria. Their optimum growth temperature is between 45C and 70C and are commonly found in hot springs and in compost heaps.

• Grow at very high temperatures. Their optimum growth temperature is between
• 70C and 110C. They are usually members of the Archae and are found growing near hydrothermal vents at great depths in the ocean.

Grow only in the presence of oxygen. They obtain their energy through aerobic respiration

Require a low concentration of oxygen (2% to 10%) for growth, but higher concentrations are inhibitory. They obtain their energy through aerobic respiration.

Grow only in the absence of oxygen and, in fact, are often inhibited or killed by its presense. They obtain their energy through anaerobic respiration or fermentation.

They are like obligate anaerobes, cannot use oxygen to transform energy but can grow in its presence. They obtain energy only by fermentation and are known as obligate fermenters.

Grow with or without oxygen, but generally better with oxygen. They obtain their energy through aerobic respiration if oxygen is present, but use fermentation or anaerobic respiration if it is absent. Most bacteria are facultative anaerobes.