BTBLIOGRArHY TO CHAPTER 30 1180 



spinlloxanthol, which is thus shown to be inactive, both in photosynthesis 

 and in phototaxis. The resuh, shoAvs close similarity of the two action spec- 

 tra, and thus supports Manten's hypothesis that phototaxis is a consequence 

 of enhanced photosynthesis. 



The observations by Duysens (1951) of carotenoid-sensitized fluores- 

 cence of bacteriochlorophyll in Chromatium and Phodo spirillum rubrum, 

 described in chapter 24 (p. 810) indicates that the capacity of the caroten- 

 oids in [)urplc bacteria (o sensitize phototaxis and photorodudioii of COo 

 may be based on transfer of their excitation energy to bacteriochlorophyll. 



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 The Light Factor. III. Photosynthesis and Light QuaUty; Role of Accessory Pigments 



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