TETRAPYRROLES 51 



27. Lascelles, J., An assay of iron protoporphyrin based on the reduction of 

 nitrate by a variant strain of Staphylococcus aureus: synthesis of iron 

 protoporphyrin by suspensions of Rhodopsetidomonas spheroides. J. Gen. 

 Microbiol., 15, 404 (1956). 



28. Labbe.R. F.,and Hubbard, N., Metal specificity of the iron protoporphyrin 

 chelating enzyme from rat liver. Biochim. Biophys. Acta, 52, 130 (1961). 



29. Yoneyama, Y., Ohyama, H., Sugita, Y., and Yoshikawa, H., Iron-chelating 

 enzyme from duck erythrocytes. Biochim. Biophys. Acta, 62, 261 (1962). 



30. Burnham, B. F., Investigations on the action of the iron containing growth 

 factors, sideramines; and iron containing antibiotics, sideromyc ins. J. Gen. 

 Microbiol., 32, 117 (1963). 



31. Granick, S., Magnesium protoporphyrin as a precursor of chlorophyll in 

 Chlorella. J. Biol. Chem., 175, 333 (1948). 



32. Green, M., Altman, K. 1., Richmond, J. E., and Salomon, K., Role of formate 

 in the biosynthesis of chlorophyll a. Nature, 179, 375 (1957). 



33. Gibson, K. D., Neuberger, A., and Tait, G. H., Studies on the synthesis of 

 porphyrins and bacteriochlorophyll by Rhodopseudomonas spheroides. 2. 

 The effects of ethionine and threonine. Biochem. J., 83, 550 (1962). 



34. Granick, S., Magnesium protoporphyrin monoester and protoporphyrin 

 monomethyl ester in chlorophyll biosynthesis. J. Biol. Chem., 236, 1168 

 (1961). 



35. Granick, S., Magnesium vinyl pheoporphyrin f/5, another intermediate in 

 the biological synthesis of chlorophyll. J. Biol. Chem., 183, 713 (1950). 



36. Stanier, R. Y., and Smith, J. H. C, Protochlorophyll from a purple bac- 

 terium. Carnegie Institute of Washington Year Book, 58, 336 (1959). 



37. Griffiths, M., Further mutational changes in the photo synthetic pigment 

 system of Rhodopseudomonas spheroides. J. Gen. Microbiol., 27, 427 

 (1962). 



38. Sistrom, W. R., Griffiths, M., and Stanier, R. Y., A note on the porphyrins 

 excreted by the blue-green mutant of Rhodopseudomonas spheroides. J. 

 Cell. Comp. Physiol., 48, 459 (1956). 



39. Tait,G. H., and Gibson, K. D., The enzymic formation of magnesium proto- 

 porphyrin monomethyl ester. Biochim. Biophys. Acta, 52, 614 (1961). 



40. Granick, S., The pigments of the biosynthetic chain of chlorophyll and their 

 interactions with light. In: Symposium No. 6, Vth International Congress of 

 Biochemistry, Moscow (1961). Pergamon Press Ltd., Oxford, 1963. p. 

 176. 



41. Smith, J. H. C., Chlorophyll formation and photosynthesis. In: Symposium 

 No. 6, Vth International Congress of Biochemistry , Moscow, 1961. Per- 

 gamon Press Ltd., Oxford, 1963. p. 151. 



42. Cohen-Bazire, G., Sistrom, W. R., and Stanier, R. Y., Kinetic studies of 

 pigment synthesis by non-sulfur purple bacteria. J. Cell. Comp. Physiol., 

 49, 25 (1957). 



43. Lascelles, J., The synthesis of enzymes concerned in bacteriochlorophyll 

 formation in growing cultures of Rhodopseudomonas spheroides . J. Gen. 

 Microbiol., 23, 487 (1960). 



44. Sistrom, W. R., Observations on the relationship between formation of 

 photopigments and the synthesis of protein in Rhodopseudomonas spheroides. 

 J. Gen. Microbiol., 25, 599 (1962). 



45. Bull.M. J., and Lascelles, J., The association of protein synthesis with the 

 formation of pigments in some photo synthetic bacteria. Biochem. J., 87, 

 15 (1963). 



46. Wolff, J. B., and Price, L., Terminal steps of chlorophyll a biosynthesis 

 in higher plants. Arc/i. Biochem. Biophys., 72, 293 (1957). 



