Page 8 - Microbiology in workplace

GMP Training – Microbiology in the Workplace by www.gmpsop.com

Oxygen requirements

Bacteria and fungi are also classified by their requirements for oxygen. They can
be aerobes (needing oxygen), anaerobes (cannot grow in the presence of oxygen),
and facultative anaerobes (can grow with or without the presence of oxygen).

OXYGEN REQUIREMENTS

Aerobic Anaerobic Facultative anaerobic
Staphylococcus aureus Clostridium botulinum E. coli

Cell structure (bacteria only)

Another way to classify bacteria is based on their cellular structure, depending
on how they react to gram stain. Some cell walls will retain the gram stain ("gram-
positive") and turn blue as a result. Other cell walls won't retain the stain ("gram-
negative"), and become red.

CELL STRUCTURE (BACTERIA ONLY)

Gram-positive Gram-negative
Clostridium botulinum E. coli

Copyright©www.gmpsop.com. All rights reserved
Unauthorized copying, publishing, transmission and distribution of any part of the content by electronic means are strictly prohibited.
Page 8 of 27