TABLE 2.

Effects of compounds on NADH dehydrogenase^a

Test compound	Concn	% Inhibition
Triton X-100	0.005%	50
Vancomycin	100 μM	−1
Moenomycin	1 μM	5
Nisin	100 μg/ml	19
Tunicamycin	30 μg/ml	47
Penicillin	100 μM	13
Cefsulodin	100 μM	13
Cephalosporin C	100 μM	89
Cephalosporin C	30 μM	76

^aCompounds were tested on E. coli AMA1004 membranes under the conditions described in the text. For the experiment with cefsulodin and cephalosporin C, 0.5 μg of membrane protein was used; for all others, the quantity of protein used was 2 μg.