| Tropism |
Chemoorganotrophs |
| Oxygen |
Facultative
anaerobes having mainly a fermentative attack on
carbohydrates |
| pH |
Optimum
pH, 7-8; no growth below pH 5 |
| Temperature |
Growth
occurs at 25`C, but species differ in their optimum,
maximum and minimum temperatures |
| Requirements |
Growth
factors are not required but no growth occurs in media
containing 6% or more of NaCl May utilize citrate and
ammonia as sole carbon and nitrogen sources, but growth
occurs slowly.. |
| Products |
Acid
but no gas is produced from glucose and certain other
carbohydrates. Lactate is oxidized to CO2.
Indole-negative by usual testing methods, but under some
conditions compounds may accumulate that give positive
reactions with indole test reagents (Corpe, 1963). Voges-
Proskauer-negative. Nitrate and usually nitrite are
reduced, often with visible gas production. Ammonia is
formed from peptone |
| Enzymes |
Usually
oxidase-positive by the method of Kovacs (1956), although
the violet pigment may interfere with the reading.
Catalase-positive Phosphatase-positive.
Arylsulfatase-negative |
| Unique features |
...
Resistant to benzylpenicillin (10 ug/ml) and to
vibriostatic agent 0/129 (2,4-diamino-6,7-
diisopropylpteridine, 30 ug/disc); sensitive to
tetracycline (30 ug/ml). |