... in the absence of a Du,asshown in Fig. 3 C. In the presence of a Du, the differencebetween the two strains was twofold over the entire DpHrange tested. In the absence of a Du, the ATP synthesis ... respectively. The data points havebeen fitted with arbitrary functions. (B) An enlarged view of (A),showing only the data obtained in the absence of Du.(C)Theratioof the best-fitting functions and of the ... including the f act that in the ATP synthases of mitochondria and of photosynthetic bacteria the position of these two amino acids in the primary sequence are inverted[24], the fact that the E....