„„„ PORPHYRINS 



Obtained with barley (55). The mechanism by which the unsymmetrical type III prophyrins 

 are formed from porphobilinogen is still in doubt. For a discussion of possible ways 

 whereby one of the pyrrole rings might be "turned around" see (56-58). 



GENERAL REFERENCE 



Granick, S. and Gilder, H. , "Distribution, Structure and Properties of the Tetrapyrroles," 



Adv. Enzymol. 7 305 (1947). 

 Hartree, E. F. , "Haematin Compounds" in Paech and Tracey 4 197. 



Lemberg, R.: "Porphyrins in Nature." Fortschr. Chem. Org. Naturstoffe 11 299 (1954). 

 Lemberg, R. and Legge, J. W. : Hematin Compounds and Bile Pigments, Interscience, 



N. Y. , 1949. 

 Rabinowitch, E. I.. Photosynthesis , Vol. 2 Pt. 1, Interscience, N. Y. , 1951. 

 Smith, J. H. C. and Benitez, A. "Chlorophylls" in Paech and Tracey 4 142. 

 Many articles in Ruhland ^. 



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