74 METABOLISM 



their action on blood cells and blood pigments, their particular growth require- 

 ments — are specialized activities, so characteristic of particular bacterial species 

 that it will be convenient to consider them in later chapters. Mention may be 

 made here of the work of Reid (1937) and Kharasch, Conway and Bloom (1936) 

 on the effect of food and inhibitory substances on the formation of pigment by 

 growing cultures of chromogenic bacteria, and by Baker (1938) on the influence 

 of light on pigment production by a species of non-pathogenic Mycobacterium. 

 In Chapter 9 we shall consider the physiological changes that constitute one aspect 

 of bacterial variation, and in Chapter 6 the relation of chemotherapy to the meta- 

 bolic processes of bacteria. 



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