Atmospheric oxygen requirements
As far as the atmospheric oxygen requirements of microorganisms are concerned, it is possible to distinguish between three groups:
  1. Types which absolutely have to have atmospheric oxygen to live (obligate aerobe)
  2. Types which thrive only in the absence of atmospheric oxygen (obligate anaerobe)
  3. Types which live in both the presence and absence of oxygen (facultative anaerobe)

Molds are generally typical aerobes, meaning that as a rule they colonize the surface of the goods (see Figs. 74 and 75). Controlled atmosphere storage, e.g. of apples, is an effective method of inhibiting aerobes. On the other hand, a large number of rot pathogens are anaerobes, capable of causing damage to preserved foods, for example.
Figure 74: Lemon, suffering from green mold - stage III (white) and stage IV (green) Figure 75: Blue mold caused by the fungal mold Penicillium italicum, stage III (white) and stage IV (blue), on an orange.
Spores can be seen at the top.


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