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


Trace element(s)




Weinberg and Tonnis (1966)



Mizusawa et al. (1966)



Tilley et al. (1975)


Fe, Co

Hickey (1945)

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Your Metabolism - What You Need To Know

Your Metabolism - What You Need To Know

If you have heard about metabolism, chances are it is in relation to weight loss. Metabolism is bigger than weight loss, though, as you will learn later on. It is about a healthier, better you. If you want to fire up your metabolism and do not have any idea how to do it, you have come to the right place. If you have tried to speed up your metabolism before but do not see visible results, you have also come to the right place.

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