BIO 3124 Lecture Notes - Lecture 6: Acidophile, Penicillin, Psychrophile
16 Oct 2016
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Nutritional complexity is a function of the biosynthetic capacity. The greater the biosynthetic capacity, the lower the nutritional requirements: more things i can make on own, lower nutritional complexity, higher biosynthetic capacity, plants>animals; auxotroph>heterotroph greater nutritional, lower biosynthetic. Composed of rich and complex ingredients - do(cid:374)"t k(cid:374)o(cid:449) e(cid:454)a(cid:272)t (cid:272)o(cid:373)positio(cid:374: ex. Soya protein extracts, milk protein extracts, blood products, tomato juice. Differential: add something to media to demonstrate discrimination of bacteria (does not inhibit. Selective: can inhibit or kill growth of certain bacteria growth) Contain compounds which inhibit or kills the undesired organisms: ex. Medium containing penicillin only allows the growth of penicillin resistant microorganisms. Allows to discriminate different species - can see the differences. Often contain ph indicators: allows to discriminate different metabolisms. Aerobic: absolute reqt of o2 for survival - to generate e, o is used as a final electron acceptor, o is used by bacteria which have an oxidative metabolism or perform aerobic respiration.
