The ultrastructure of Candida krusei
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Abstract:
Various methods of chemical fixation and freeze-drying of Candida krusei were compared to determine the most appropriate method for the ultrastructural investigation of the thick walled organisms of this genus. Freeze-drying without chemical fixation was of little value because of insufficient variation in electron density. Potassium permanganate was able to penetrate the intact cell but failed to show cytoplasmic glycogen and lipid and some details of the cell wall. While normal glutaraldehyde, formaldehyde and osmium tetroxide treatment failed to permeate and preserve intracellular structures, several cycles of rapid freezing (- 155 degrees C) and thawing followed by glutaraldehyde fixation and osmium tetroxide post-fixation demonstrated the intracellular details of the majority of cells so treated.
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