/ 



6 CONTENTS VOL. 12 (1953) 



Degradation of aldoses by means of their disulfones 



by D. L. McDonald and H. O. L. Fischer (Berkeley) 203 



CO„ turnover in the fermentation of 3, /), 5 and 6 carbon compounds by the propionic acid 



bacteria 



by H. G. Wood and F. W. Leaver (Cleveland) 207 



Enzymic synthesis and breakdown of a pyrimidine, orotic acid. I. Dihydro-orotic dehydrogenase 



by I. Lieberman and A. Kornberg (Bethesda/St. Louis) 223 



Enzymic conversion of phosphorylase a to phosphorylase /; 



by P. J. Keller and G. T. Cori (St. Louis) 235 



The pathways of acetate oxidation 



by E. S. Guzman Barron and F. Ghiretti (Chicago) 239 



The role of phosphoglycosyl compounds in the biosynthesis of nucleosides and nucleotides 



by H. M. Kalckar (Copenhagen) 250 



Precipitability of small quantities of cell constituents and metabolites as insoluble radioactive 



compounds 



by C. Neuberg and A. Grauer (New York and Gastein) 265 



On the compounds of ferricytochrome c appearing in acid solution 



by E. Boeri, A. Ehrenberg, K. G. Paul and H. Theorell (Stockholm) 273 



Influence du manganese sur la stabilite du lysozyme. IL Role protecteur du manganese lors 



de I'hydrolyse du lysozyme par la trypsine 



par L. GoRiNi, F. Felix et C. Fromageot (Paris) 283 



New methods for the study of the carbon monoxide compounds of respiratory enzymes 



by B. Chance, L. Smith and L. Castor (Philadelphia) 2S9 



Enzymes of fatty acid metabolism 



by F. Lynen and S. Ochoa (Miinchen and New York) 299 



Choline acetylase specificity in relation to biological function 



by R. Berman, L B. Wilson and D. Nachmansohn (New York) 315 



tJber Pyrrol-radikale 



von R. Kuhn und H. Kainer (Heidelberg) 3-^5 



Effects of insulin on melanoma and brain metabolism 



by M. Woods, K. Wight, J. Hunter and D. Burk (Bethesda, Md.) 329 



An electrochemical demonstration of the energy cycle and maximum quantum yield in photo- 

 synthesis 



by K. Damaschke, F. ToDT, D. Burk AND O. Warburg (Berlin-Dahlcm) 3-17 



Messung des Quantenbedarfs der Photosynthese fiir sehr diinne ZcUsuspensioncn 



von O. Warburg (Berhn-Dahlem) 35^ 



Author Index 3^1 



Subject Index 3^^ 



