Membrane Specialization and Cytoskeletal Structures in the Synapse and Axon Revealed by the Quick-Freeze, Deep-Etch Method

Author(s):  
Nobutaka Hirokawa
1981 ◽  
Vol 88 (3) ◽  
pp. 660-663 ◽  
Author(s):  
D M Landis ◽  
T S Reese

Membranes of the astrocytic processes investing small blood vessels and the surface of the brain contain numerous arrays of orthogonally packed particles as revealed by the freeze-fracture technique. The structure of these particle arrays, which we have termed "assemblies," is the same whether tissue is prepared for freeze-fracture by conventional fixation or by quick excision and rapid freezing. However, assemblies are progressively replaced by amorphous clumps and then disappear as the interval between decapitation and rapid freezing increases. Nearly normal numbers of assemblies may be maintained in cerebellar slices in vitro, but there too they disappear at low PO2 or in the presence of dinitrophenol. No other neuronal or glial membrane specialization exhibits a comparable lability.


1981 ◽  
Vol 77 (3) ◽  
pp. 360-365 ◽  
Author(s):  
Roberto Montesano ◽  
Pierre Didier ◽  
Lelio Orci

Author(s):  
Casper C. Hoogenraad ◽  
Ioana Popa ◽  
Kensuke Futai ◽  
Emma Martinez-Sanchez ◽  
Phebe S. Wulf ◽  
...  

Author(s):  
Gregory J. Doucette

The present investigation was undertaken to examine the nonsiliceous ultra-structure of diatoms (BacilIariophyta) by means of freeze fracture electron microscopy. Freeze fracture procedures are complicated by the difficulties encountered in fracturing silica-based components and the removal of these materials subsequent to replica casting. Supplementary data was obtained through conventional thin section methodologies. This report is a prelim¬inary account of observations made on selected nonsiliceous, cellular con¬stituents of Thalassiosira antarctica Comber, a planktonic, marine diatom.


1975 ◽  
Vol 67 (3) ◽  
pp. 904-911 ◽  
Author(s):  
T R Collins ◽  
J C Bartholomew ◽  
M Calvin

A simple method is described for the freeze-fracture in situ of monolayer cultures grown on gold carriers coated with a thin layer of silicon monoxide. Preliminary observations on 3T3 mouse embryo fibroblasts indicate that this technique exposes large areas of cell membrane, making it possible to determine how areas of membrane specialization are related to the cell as a whole and to regions of cellular interaction. 3T3 cells cultured on silicon monoxide show no modification of growth properties compared to cells growing on Falcon plastic, and other cell lines also appear to grow well on this substrate.


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