GREEN FLUORESCENT BACTERIA FROM WATER 93 



160 seconds. With the fluorescent bacteria, however, the results 

 are quite different. In each case a few cells were found alive 

 at the end of 200 seconds. Curves accompany the paper by 

 these investigaitors which indicate that the death rate follows 

 the monomolecular law. Burge and Neill explain this resistance 

 of fluorescent bacteria to ultra-violet light by assuming that 

 ''the fluorescent bacteria protect themselves from the coagulat- 

 ing effect of the ultra-violet light by converting the short wave 

 lengths to longer waves and hence disposing of energy of the 

 absorbed short waves." Non-fluorescent bacteria were unable 

 to do this. 



Divisions of strains into groups 

 The group numbers allow the following separation of strains. 



