Dear Dr RKA,
the article is interesting and i ve a question:is the ability of streptococcus to live on the moon has something associated with its anaerobic living character?
does “anaerobic” means living without oxygen completely?
other bacteria which are a naerobic can live on the moon?
i found the clear answer on John L’s bacteriology pages:
[Strict or Obligate] Aerobe: An organism that is capable of using oxygen as a terminal electron acceptor [i.e., aerobic respiration], can tolerate a level of oxygen equivalent to or higher than that present in an air atmosphere (21% oxygen), and has a strictly respiratory type of metabolism. Some aerobes may also be capable of growing anaerobically with electron acceptors other than oxygen [i.e., anaerobic respiration].
Facultative anaerobe: An organism that can grow well both in the absence of oxygen and in the presence of a level of oxygen equivalent to that in an air atmosphere (21% oxygen). Some are capable of growing aerobically by respiring with oxygen and anaerobically by fermentation [anaerobic respiration is also possible]; others have a strictly fermentative type of metabolism and do not respire with oxygen. [We form the “aerotolerant anaerobe” category with the latter type; see below.]
Microaerophile: An organism that is capable of oxygen-dependent growth but cannot grow in the presence of a level of oxygen equivalent to that present in an air atmosphere (21% oxygen). Oxygen-dependant growth [i.e., aerobic respiration] occurs only at low oxygen levels. In addition to being able to respire with oxygen, some microaerophiles may be capable of respiring anaerobically with electron acceptors other than oxygen.
[Strict or Obligate] Anaerobe: An organism that is incapable of oxygen-dependent growth and cannot grow in the presence of an oxygen concentration equivalent to that present in an air atmosphere (21% oxygen). Some anaerobes may have a fermentative type of metabolism; others may carry out anaerobic respiration in which a terminal electron acceptor other than oxygen is used. [The primary consideration for defining an organism as a strict anaerobe is its total intolerance of oxygen.]