the transmembrane proton electrochemical potential gradient deltamu ( h+ ) in whole cells of anacystis nidulans was measured in aerobic and anaerobic dark conditions using the distribution , between external medium and cell interior , of radioactively labeled weak acids ( acetylsalicyclic acid , 5,5-dimethyloxazolidine-2,4-dione ) or bases ( imidazole , methylamine ) , and permeant ions ( tetraphenylphosphonium cation , thiocyanate anion ) , as determined by flow dialysis .
C0022023
ions
C0003075
anion