MICRO 302 Lab 24-27

Obligate (Strict) Aerobes
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Terms in this set (20)
Obligate (Strict) Aerobes
must grow in oxygen because their metabolism requires oxygen
Microaerophiles
prefer to grow in oxygen concentrations of 2-10% rather than the 20% found in the atmosphere
facultative anaerobes
grow very well aerobically but also have the capacity to grow anaerobically if oxygen is not present
Aerotolerant Anaerobes
anaerobes can tolerate oxygen and even grow in its presence, but they do not require oxygen for energy production.

produce their energy strictly by fermentation
Obligate (Strict) Anaerobes
cannot tolerate oxygen and must be cultured under conditions in which oxygen is completely eliminated
catalase
breaks down hydrogen peroxide
Peroxidase
an enzyme that destroys hydrogen peroxide
Superoxide dismutase
catalyzes conversion of superoxide radicals to hydrogen peroxide
Psychrophiles
cold lovers
Mesophiles
medium temp 25-40°C
Thermophilesheat lovers 45-70° CHyperthermophilesextreme heat >70°C (158°F)Psychrotrophsclassified as mesophiles, but capable of growth at low tempsNeutrophilesgrow in 5.6-8.5 pHAcidophilesgrow in 1-5.5 pHAlkaliphilesgrow in 8.6-14 pHHypotonic SolutionSolute concentration on outside of cell is lower than in the cell ◦ Water flows into the cells ◦ Can cause cell to swell and lyseObligate halophilesrequire high salt (15-30%) to growHalotolerantdon't require salt, but capable of growth in moderate concentrationsOsmophilesgrow in high sugar