CONTENTS 



M. ISHIMOTO and F. Egami: Meaning of nitrate and sulphate reduction in the 



process of metabolic evolution 555 



B. A. Rubin: The comparative characters of the oxidative systems of various groups 



of organisms in relation to their evolution* 562 



S. Oeriu: The cflfect of cysteine on the methionine content of the animal and plant 



organism 572 



Discussion (Chairman: J. S. Heller): 578 



K. MoTHES, A. Blagoveshchenski!,* N. S. Akulov,* G. A. KRiisKii* 



Seventh Session (Chairman: E. M. MakovskiI) 

 The Evolution of Metabolism {continued) 



Reports 



E. Aubel : Au sujet du passage de la vie anaérobie â la vie aérobie 585 



Y. Oda : Significance of molecular hydrogen metabolism in the transitionary stage 



from anaerobiosis to aerobiosis 593 



A. A. KrasnovskiI: Development of the mode of action of the photocatalytic system 



in organisms* 606 



COMMtTNICATIONS 



C. Reid: The relation between primitive and present-day photobiological processes 619 

 Yu. I. Sorokin: The evolution of chemosynthesis 626 



D. J. Sapozhnikow: Entstehung und Evolution der phototrophen Ernährungsweise 635 

 T. N. GODNEV : Die Grundetappen der Biogenese des Chlorophylls 642 

 S. Scher: Thermal factors in archaeometabolism 650 



Final General Discussion (Chairman: M. Calvin):* 652 



Chairman's introductory remarks, S. Fox, S. Scher, J. D. Bernal, 



D. I. Sapozhnikov, K. Mothes, E. Chargaff, G. Schramm, K. Felix, 



A. M. GoLDOVSKii, M. Calvin, A. E. Braunshteïn, A. G. PasynskiI, S. Miller, 



L. Pauling, A. I. Oparin, Chairman's closing remarks 



Author Index 657 



StrajECT Index 674 



