78 STUDYING MOLDS, YEASTS, AND ACTINOMYCETES . 



Hopper -° have discussed further the identification of mold cultures 

 by ultraviolet light. Davidson and Gregory ^ described an inex- 

 pensive source of filtered ultraviolet light. 



It appears that, although the use of fluorescence is a valuable 

 clinical method, the conditions which determine the phenomenon and 

 the specific color of the fluorescence are not yet well enough known 

 for its satisfactory use in identifying cultures in the laboratory. The 

 unreliability of the use of ultraviolet light for identification of cul- 

 tures has very recently been emphasized by Benedek ^ who, however, 

 stressed the great value of this tool in the clinic for distinguishing 

 ringworms of the scalp due to Microsporum from those due to Tri- 

 chophyton. Especially the value of ultraviolet light for detecting 

 carriers was stressed. 



LITERATURE 



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diagnostic problems in tinea capitis, Mycologia, 36, 598 (1944). 



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{Chicago), 33, 665 (1936). 



3. Conn, H. J., The use of various culture media in characterizing actino- 



mycetes, A^. Y. Agr. Exp. Sta. (Geneva) Tech. Bull. S3 (1921). 



4. CoRNBLEET, T., A reagent for demonstrating fungi in skin scrapings and hair, 



J. Am. Med. Assoc, 95, 1743 (1930). 



5. Davidson, A. M., and P. H. Gregory, Convenient source of light for diag- 



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6. Davidson, A. M., and P. H. Gregory, So-called mosaic fungus as an inter- 



cellular deposit of cholesterol crystals, /. Am. Med. Assoc, 105, 1262 

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into mosaic fungus, Arch. Dermatol. Syphilol. (Chicago), 33, 865 (1936). 



9. Drechsler, C, Morphology of the genus Actinomyces, Boian. Gaz., 67, 



65, 147 (1919). 



10. Emmons, C. W., Dermatophytes. Natural grouping based on the form of 



the spores and accessory organs, Arch. Dermatol. Syphilol. (Chicago), 30, 

 337 (1934). 



11. Eraser, O. G., The action of methylene blue and certain other dyes on 



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