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Abstract
SUMMARY: The growth of Mycobacterium phlei and Bacillus subtilis either on plate culture or in liquid medium is completely inhibited by technical chlordane at identical concentrations. NADH oxidation by membrane fragments and oxidative phosphorylation by crude extracts of M. phlei are only partially inhibited by incubation with chlordane at concentrations equal to or greater than the minimum levels required to completely inhibit growth.
Streptococcus faecalis is relatively insensitive to technical chlordane, bacteriosta-sis only being achieved at chlordane concentrations some five-to tenfold greater than those required with Bacillus subtilis and Mycobacterium phlei. The energy metabolism of S. faecalis is relatively simple since it contains neither a cytochrome-mediated electron transport chain nor a functional TCA cycle. Fermentation of d-glucose by soluble protein extracts, Na-K-ATPase and cation permeability of the plasma membrane are not sensitive to chlordane at concentrations that stop growth in liquid culture. Inhibition of fermentation by growing cultures, upon addition of chlordane, may be a reflection of the inhibition of biosynthetic reactions that recycle ATP.
- Accepted:
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