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Mode of Action of Isonicotinic Hydrazide S. D. RUBBO, JANICE EDGAR, J. CYMERMAN-CRAIG, G. N. VAUGHAN & D. WILLIS School of Bacteriology, University of Melbourne. IN our earlier report we directed attention to the importance of chelation as an essential step in the anti-tuberculous activity of isonicotinic hydrazide (isoniazid)1. It was impossible to decide whether the chelating action with a metal or metals took place before (in the medium) or after adsorption on the bacterial cell.
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