Anaerobic Bacteria I
Card Set Information
Anaerobic Bacteria I
Absolute requirement for O2 to grow
under conditions of high reducing intensity (anaerobic system w/ 0% O2)
O2 is toxic
aerobic or anaerobic
Grow best under lower O2 intensity (anaerobic system w/ 0% O2 or in 10% CO2, 85% N2, 5% O2
Higher O2 tensions may be inhibitory (no growth in CO2 incubator with 5% CO2, 15% O2 or in ambient air with about 21% O2
Anaerobes that are
not killed by
Best growth in anaerobic system w/ 0% O2
Moderate growth in 10% CO2, 85% N2, 5% o2
Less growth in CO2 incubator, 5% CO2, 15% O2
Less growth in ambient air about 21% O2
Name a species that is anaerobic, Gram pos, bacilli, and a spore former. Name 6 organisms in this group.
3. C. botulinum
List 6 species that are anaerobic, Gram pos, bacilli, and non-spore formers.
Name a species the is anaerobic, gram pos cocci, and a non-spore former. Name 2 organisms in this species.
Name 1 organism and 1 species that are anaerobic and gram pos cocci.
Name 6 species that are anaerobic Gram neg bacilli.
Name 3 anaerobic Fusobacterium species.
Name an important anaerobic Porphyromonas organism.
Name 2 important anaerobic Prevotella organisms.
Name 2 species of anaerobic gram neg cocci.
Strict anaerobes die within _____ minutes of _______ exposure.
Name 3 enzymes that moderate anaerobes can use to protect themselves from the toxic effects of O2 production. Can anaerobes that do not produce these enzymes still have a high level of virulence?
What do catalase and peroxidase break down?
¢H2O2 to H2O and molecular O2
Catalase is found in what type of bacteria?
Peroxidase is found in several ________ anaerobes.
aerobic or facultative bacteria
Peroxidase found in several aerotolerant anaerobes
What enzyme converts superoxide radicals to H2O2 and molecular O2?
Describe Phase 1 of the sensitivity of anaerobes to O2.
When anaerobes are placed into an O2-containing atmosphere,
electrons normally available for cellular metabolic processes are diverted to the reduction of molecular O2
which leads to a complete cessation of growth.
This is a
up until the time of Phase 2.