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Studies in Penicillin Formation.*
Published online by Cambridge University Press: 11 June 2012
Synopis
Extracts of green peas stimulate penicillin formation by Penicillium notatum, and fractions have been prepared by treating the juice with ethanol to find the constituents present which have a stimulating action. The mould has been grown as a surface culture on a basal medium containing NaNO3, KH2PO4, MgSO4, NaCl and lactose to which the various fractions have been added. One chemically complex fraction containing a large number of amino acids (demonstrated by paper partition chromatography and estimated micro-biologically), carbohydrates and mineral matter (containing a number of trace elements) gives high yields of penicillin. The types of penicillin produced on this medium have been determined by micro-chromatography.
Chemically defined media have been formulated, and information has been obtained on the sources of carbon and nitrogen that permit growth and penicillin formation.
The amounts of carbohydrate and salts in the medium influence the formation of penicillin. Excess of carbohydrates such as glucose cause an increase in growth of the mould and a decrease in the production of penicillin.
The significance of the results in relation to the formation of penicillin is discussed.
- Type
- Research Article
- Information
- Proceedings of the Royal Society of Edinburgh, Section B: Biological Sciences , Volume 64 , Issue 2 , 1950 , pp. 137 - 171
- Copyright
- Copyright © Royal Society of Edinburgh 1950
Footnotes
This paper was assisted in publication by a grant from the Carnegie Trust for the Universities of Scotland.