Asian Journal of Microbiology, Biotechnology & Environmental Sciences Paper

Vol 11, Issue 2, 2009; Page No.(257-261 )

CELL WALL ALTERATIONS IN THE YEASTS EXPOSED TO A HUMIC SUBSTANCE

VLADIMIR JIRKU, ZDENEK ZIZKA, ALENA CEJKOVA, JAN MASAK, TEREZA KRULIKOVSKA, AND LIBUSE MADRONOVA

Abstract

Candida maltosa cells, srown in the presence and absence of an isolate from the oxihurnolites of a brown coal deposit (humate based substance PAB 32), were compared. The thin-sectioned surfaces of the cells exposed to PAB 32 reveal coat uf hc.',terogenous electron density intimately associated with the outer part of the cell wall. Thus modified .vvalls contain increased amounts of proteins, easily extractable lipids, bound lipids, aminosugars, mannan, mannoproteins and chitin. Moreover, the presence of humic substance causes cell wall thickening, periplasmic space invaginations and wall whorls formation. Cell wall alterations are function of cultivation time and indicate that an additive macromolecular structure of a humic substance, coating the outer part of the cell wall, acts as a physiologically active component of this zone.

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