PANTOTHENIC ACID 



L. helveticus was interference by other growth stimulants, subse- 

 quently shown to be fatty acids ; this phenomenon was first en- 

 countered in the assay of ribofiavine (page 158) and interference from 

 this source was overcome by extraction of the medium and test 

 solution with solvent, as in the assay of ribofiavine. ^^ 



References to Section 6 



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362 



