BACTERIAL PHOTOSYNTHESIS 



ing block contains 1 carotenoid molecule 



199 



2 bacteiiochlorophyll 

 molecules, 10 cephalin molecules, and protein containing 220 amino 

 ds. Although a structural subunit witli a molecular weight of 



aci 



Fig. 10. An electron micrograph of thin sections of organisms in which the 

 development of colored carotenoids has been prevented by diphenylamine 

 treatment. The absence of these pigments does not alter the characteristic 

 appearance of the chromatophores which are dispersed throughout the cyto- 

 plasm. M: Metaphosphate inclusions; N, V, W: see Fig. 6. X22,000. 



about 40,000 seems ridiculously small, this agrees with the molecu- 

 lar weight of the chloroplastin obtained by digitonin extraction of 

 Euglena chloroplasts (Wolken, 1956; Wolken and Schwertz, 1956). 



