Supplin
Supplines (also: growth factors ) are in the microbiology chemical compounds called that of a microorganism art or - derived not from simple building blocks synthesized can be, but still the metabolism are needed (essential). Microorganisms that suppline must first absorb in order to grow are known as auxotrophs .
Overall, supplines can be amino acids , purines , pyrimidines , organic acids , carbohydrates and vitamins . In contrast, prototrophic (independent) bacteria only need, for example, inorganic salts and an energy source such as glucose . Auxotrophic microorganisms also need certain organic compounds.
Supplins differ significantly from nutrients in terms of their function and concentration ; they most closely correspond to the vitamins in animal and human nutrition . In mixed microbial biocenoses, the end or intermediate products of the metabolism of one species are often used as supplines, which also results in a regulating mechanism . Often the same supplines, which are a growth factor for one species, can have a significant inhibitory effect on another. In addition, depending on its concentration, a certain supplin can have the same effect both inhibiting and promoting.
Supplins are detected , among other things, by a growth inhibition test.
Individual evidence
- ^ Schlegel: Allgemeine Mikrobiologie , 5th edition, Thieme-Verlag, Stuttgart 1981, p. 169