The Haem-GIobin Linkage. 3. The Relationship between Molecular 

 Structure and Physiological Activity of Haemoglobins 

 Z>j J. E. O'Hagan 173 



Discussion 



Native globin . . . . . . . . .190 



The Linkage of Iron and Protein in Haemoglobin . . . .190 



Early Stages in the Metabolism of Iron 



by J. B. Neilands 194 



The Enzymic Incorporation of Iron into Protoporphyrin 



by R. A. Neve 207 



Discussion 



The Formation of Metal-Porphyrin Complexes . . . . .211 



Co-ordination of Divalent Metal Ions with Porphyrin 



Derivatives Related to Cytochrome c 



by J. B. Neilands 211 



Metal Incorporation in Model Systems . . . . . .214 



On the Enzymic Incorporation of Iron . . . . . .215 



Biosynthesis and Metabolism of Cytochrome c 



by D. L. Drabkin 216 



The Location of Cytochromes in Escherichia coli 



by A. TissiERES ......... 218 



Discussion 



The Origin of the Respiratory Granules of Bacteria .... 223 



On the Cytochromes of Anaerobically Cultured Yeast 

 by Paulette Chaix 



Discussion 



The Lactate Dehydrogenase of Yeast ...... 233 



' Components of the Respiratory Chain in Yeast Mitochondria . . 233 



On the 'Haemoglobin'' Absorption Band o I Yeast .... 233 



