Membranous structures in yeasts.

摘要: Summary 1. Most yeast cells carrying out active respiration have spherical or ellipsoidal mitochondria, with plate-like cristae. 2. Cytoplasmic petite strains of Saccharomyces cerevisiae aberrant often containing whorled membranes. Mutants deficiencies in the tricarboxylic acid cycle mitochondria which appear normal when are grown low levels glucose. 3. Cells and S. strictly anaerobically show no recognizable mitochondrial profiles. 4. Carbon substrates can only be respired promote development well-defined mitochondria. In certain facultatively anaerobic yeasts is suppressed by glucose under these conditions large, pleomorphic few number. Other fermentable carbohydrates do not give this repression. 5. A number antibacterial antibiotics, inhibit protein synthesis, cause a disorganization cristae. 6. adapting from to aerobic develop proliferations endoplasmic reticulum, become progressively more organized. 7. Vacuoles contain granular material, but vacuole, has been described as lysosome, frequently contains myelin-like lipid inclusions. The material inclusions apparently derived spherosomes. 8. Endoplasmic orientated parallel plasmalemma, may associated fermentative ability yeasts. reticulum also actively involved budding process. 9. Normally yeast-cell plasmalemma shows minor convolutions, chloramphenicol-grown Rhodotorula glutinis produces vesicular structures termed ‘paramural bodies’. 10. nuclear membrane about 200 pores occupying 6–8 % total surface area. remains intact during mitotic division until daughter nuclei separate.