BIBLIOGRAPHY 49 



occurrence and the chemistry of the cerebrins are reviewed by Celmer 

 and Carter (24). 



Virtually all fungi appear to form sterols. The amount in myce- 

 lium is usually about 1 per cent or less of the dry weight. Compre- 

 hensive surveys have been made by Pruess and others (132-134): the 

 sterol content was found to be affected by the growth medium, the 

 highest level attained being 1.70 per cent of the dry weight, in Paeci- 

 lomyces varioti. Different isolates assigned to Aspergillus niger vary 

 in sterol content from 0.23 to 1.16 per cent (12). A more recent survey 

 (4) finds that the sterol content of fungi ranges from zero, in Colletotri- 

 chum graminicolum , to 2.2 per cent of the dry weight, in Penicillium 

 ivestlingii. 



The principal sterol of fungi is ergosterol; a dihydro derivative, 

 fungisterol, occurs in ergot (174). Ergosterol occurs as the palmitate 

 in Penicillium spp. (121) and Aspergillus fumigatus (187). Other 

 sterols have been only tentatively identified (70, 71, 146). 



The metabolism of exogenous steroids and the composition of the 

 carotenoid pigments are considered elsewhere (Chapter 6). 



BIBLIOGRAPHY 



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7. Behr, G. 1930. Arch. Mikrobiol. 1: 418-444. 



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9. Bernhard, K. and H. Albrecht. 1948. Helv. Chim. Acta 31: 977-988. 



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