BACTERIAL PHOTOSYNTHESIS 191 



1 i^^ 



■p. ■ 







'J 

 4 



V 



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'^1' 



^4 



--0.5^- 



Fig. 7. An electron micrograph of o thin section of a typical chromatophore 

 preparation. The chromatophores occur singly, in clumps, and occasionally as 

 chains. This aggregation seems to be produced by the fixative. Larger vesicles 

 (V) may be present. It is not known whether or not these structures are large 

 chromatophores. Small dense particles (Sp) are often present as contaminants. 

 X 78,000. 



"small" chromatophores, just as Newton and Newton (1957) have 

 distinguished "chromatophores" and "small particles." 



We have already reviewed the biochemical reasons for doubting 

 the idea (Newton and Newton, 1957) that the structure which we 

 identify as the chromatophore is a fragment of the "real" chromato- 

 phore. When we consider, in addition, the electron microscopic 

 observations on intracellular components and remember that two- 



