Amphibian yolk platelet ultrastructure visualized by freeze-etching
نویسندگان
چکیده
منابع مشابه
The Ultrastructure of Yolk Platelets of Amphibian Oocytes
In a number of recent papers (1, 4, 7, 10, 11) it has been shown by electron microscopy that viruses which infect and propagate in HeLa cell cultures, form intranuclear crystalline aggregates. Each of these is composed of a closely packed lattice of regularly ordered spherical viral particles, with a periodicity of about 600 A. Using an improved shadow casting technique, Labaw and Wyckoff (8) p...
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The indigenous microflora of soil were released from the soil materials and concentrated without the occurrence of growth by use of a blending-simple centrifugation procedure. The cell concentrate was then frozen-etched and viewed by transmission electron microscopy. Criteria were established for detecting microbial cells among the residual soil debris. The freeze-etching of the soil cell conce...
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The present study on the ultrastructure of Bacillus subtilis was undertaken in order to examine by means of the freeze-etching technique possible structural changes occurring during the chemical fixation procedure (Ryter-Kellenberger (R-K) fixation). Three stages were followed by freeze-etching, viz.: (a) fixation in osmium tetroxide, (b) fixation in osmium tetroxide and posttreatment with uran...
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INTRODUCTION In recent years the polarity of dictyosomes has been well established, both iu functional and in morphological terms (Mollenhauer & Morre, 1966; Favard, 1969). Although many of the observed differentiations across stacks of dictyosome cisternae probably result from changes in the Golgi membranes and their associated enzymes, it has only recently been possible to obtain electron-mic...
متن کاملThree types of gap junctions interconnecting intestinal epithelial cells visualized by freeze-etching.
Gap junctions are specialized membrane regions that seem to mediate intercellular communication. They appear to contain closely packed arrays of equally sized particles all of which, upon freeze-cleaving, remain attached to one membrane leaflet and not to the other. One gap junction cleavage face, therefore, always exhibits a closely packed array of particles, while the other features a corresp...
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ژورنال
عنوان ژورنال: Journal of Ultrastructure Research
سال: 1972
ISSN: 0022-5320
DOI: 10.1016/s0022-5320(72)80019-4