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Micro_Unit4
Term | Definition |
---|---|
Superoxide dismutase | Produced with catalase to detoxify superoxide and hydrogen peroxide that is produced |
Facultative | Growaerobically or anerobically in the presence or absence of O2 |
Microaerophilic | Requires low O2 concentration and generally a high CO2 concentration |
Obligate anaerobic | Incapable of aerobic metabolism but are tolerant of O2 |
Capnophilic | Thrive in high CO2 concentrations |
Aerotolerant | Do not require O2 as they metabolise anaerobically |
Acceptable Specimens (anaerobes) | protected from O2, taken from: blood, bile, bone marrow, CSF, lung aspirate, dental/abdominal/pelvic abscess, burn wound |
PEA agar | Supports all obligate anaerobes (gram positive and negative), used to suppress growth of gram negative facultative (like Proteus) |
Bacteroides Fragilis | resistant to penicillin and not inhibited by bile, most common anaerobe, BBE agar |
Clostridium Perfringens | cause of gas gangrene, double zone of hemolysis, lecithinase positive |
Clostridium Botulinum | Canned foods, lipase positive, causes Botulism |
Clostridium Tetani | neurotoxin, lockjaw, gram positive bacilli with spores like drumsticks or tennis rackets, indole positive, motile |
Clostridium Difficile | Pseudomembranous colitis, indole/glucose/fructose positive, motile |
Mobiluncus | cause of anaerobic vaginosis, nonmotile, catalase and indole negative, curved bacilli |
Propionobacterium Acnes | anaerobic diphtheroids, normal flora, catalase and indole positive |
Prevotella | urease negative, oxidase negative, resistant to Kanamycin |