Anaerobic Bacteria I

Home > Flashcards > Print Preview

The flashcards below were created by user Anonymous on FreezingBlue Flashcards. What would you like to do?

  1. obligate aerobes
    —Absolute requirement for O2 to grow
  2. Obligate anaerobes
    • —Grow only under conditions of high reducing intensity (anaerobic system w/ 0% O2)
    • —O2  is toxic
  3. ¢Facultative anaerobes
    —Grow under aerobic or anaerobic conditions
  4. Microaerophiles
    • —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
  5. ¢Aerotolerant anaerobes
    • —Anaerobes that are not killed by exposure to O2
    • 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
  6. Name a species that is anaerobic, Gram pos, bacilli, and a spore former.  Name 6 organisms in this group.
    • ¢Clostridium spp
    • 1.C. perfringens
    • 2.C. difficile
    • 3. C. botulinum
    • 4.C. histolyticum
    • 5.C. septicum
    • 6.C. tetani
  7. List 6 species that are anaerobic, Gram pos, bacilli, and non-spore formers.
    • 1.Actinomyces spp
    • 2.Bifidobacterium spp
    • 3.Eubacterium spp
    • 4.Lactobacillus spp
    • 5.Mobiluncus spp
    • 6.Propionibacterium spp
  8. Name a species the is anaerobic, gram pos cocci, and a non-spore former. Name 2 organisms in this species.
    • ¢Peptostreptococcus spp
    • 1.P. anaerobius
    • 2.P. asaccharolyticus
  9. Name 1 organism and 1 species that are anaerobic and gram pos cocci.
    • —Staphylococcus saccharolyticus
    • —Streptococcus spp
  10. Name 6 species that are anaerobic Gram neg bacilli.
    • —1.Bacteroides
    • —2.Bilophila
    • —3.Campylobacter
    • —4.Fusobacterium
    • 5.Porphyromonas
    • 6.Prevotella
  11. Name 3 anaerobic Fusobacterium species.
    • ¢F. mortiferum
    • ¢F. necrophorum
    • ¢F. nucleatum
  12. Name an important anaerobic Porphyromonas organism.
    ¢P. asaccharolytica
  13. Name 2 important anaerobic Prevotella organisms.
    • ¢P. intermedia
    • ¢P. melaninogenica
  14. Name 2 species of anaerobic gram neg cocci.
    • —Veillonella 
    • —Megasphaera spp.
  15. Strict anaerobes die within _____ minutes of _______ exposure.
    • 10
    • O2
  16. 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?
    • catalase
    • superoxide dismutase
    • peroxidase
    • yes
  17. What do catalase and peroxidase break down?
    ¢H2O2 to H2O and molecular O2
  18. Catalase is found in what type of bacteria?
    Peroxidase is found in several ________ anaerobes.
    • aerobic or facultative bacteria
    • —Peroxidase found in several aerotolerant anaerobes
  19. What enzyme converts superoxide radicals to H2O2 and molecular O2?
    Superoxide dismutase
  20. 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.
    • —Metabolic processes stop which leads to a complete cessation of growth.—
    • This is a bacteriostatic effect, which is reversible up until the time of Phase 2.

Card Set Information

Anaerobic Bacteria I
2013-02-12 16:02:47
micro exam

from ppt
Show Answers:

What would you like to do?

Home > Flashcards > Print Preview