Growth Factors

Some micro-organisms cannot synthesize a full complement of cell components and therefore require preformed compounds called growth factors. The growth factors most commonly required are vitamins, but there may also be a need for specific amino acids, fatty acids

Table 4.11. Trace elements influencing primary and secondary metabolism

Product

Trace element(s)

Reference

Bacitracin

Mn

Weinberg and Tonnis (1966)

Protease

Mn

Mizusawa et al. (1966)

Gentamicin

Co

Tilley et al. (1975)

Riboflavin

Fe, Co

Hickey (1945)

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