MoS2 Microtubes: An Electron Microscopy Study

1998 ◽  
Vol 05 (01) ◽  
pp. 423-426 ◽  
Author(s):  
M. Remškar ◽  
Z. Škraba ◽  
F. Cléton ◽  
R. Sanjinés ◽  
F. Lévy

Recently it was found that instability of thin weakly bonded MoS 2 sheets against folding can lead to a growth of hollowed microtubes with several mm lengths, 1–20 μm diameter and less than 0.1 μm wall thickness.1 Bent sheets can directly roll up into the tube or they can produce in their microfolds a turbulent gas flow of transported molecules which promotes a tubelike growth mode. These uncommon stable features of inorganic crystals reveal a great similarity to much smaller carbon fullerences and especially to inorganic ( MoS 2, WS 2) nested fullereness-nanotubes.2 Scanning electron microscopic studies of cylindrical microtubes and twisted microribbons are combined with high resolution electron microscopic observations of stacking faults.

Author(s):  
A. Lupulescu ◽  
J.E. Habowsky ◽  
J. Milkintas ◽  
D. Birmingham

Recent light and electron microscopic studies showed that corticosteroids and testosterone induced changes in the structure of fibroblasts and collagen synthesis. Our previous investigations demonstrate that also calcitonin significantly interferes with collagen synthesis and fibroblast growth in wounded rabbits.Conflicting findings were reported by using biochemical and light microscopic studies following estrogens and thyroxine administration. This report concerns some investigations with regard to the role of estradiol and thyroxine on collagen synthesis in rats.Adult male rats were used in these experiments. They were divided in three groups of 10 rats each. A) Thyroxine-treated rats: each rat received intramuscularly (im) 100 μg thyroxine (Synthroid), every other day, for one month. B) Estrogen-treated rats: each rat received 500 μg estradiol dipropionate, every other day, for one month. C) Controls, received only the diluent.


1989 ◽  
Vol 51 (4) ◽  
pp. 775-791 ◽  
Author(s):  
Mitsuo ABE ◽  
Kazushige TAKEHANA ◽  
Kenji IWASA ◽  
Takeo HIRAGA

1979 ◽  
Vol 88 (6_suppl4) ◽  
pp. 2-14 ◽  
Author(s):  
Malcolm D. Graham ◽  
Rodney Perkins

The structure of the normal human stapes was studied with the scanning electron microscope. Specimens were obtained 48 hours after death from adult human temporal bones free from obvious inflammatory disease. The specimens were fixed, dissected, critical-point dried and coated with gold. In this scanning electron microscopic study an attempt has been made to systematically demonstrate the average scanning electron microscopic features of various areas of the normal human stapes. An emphasis has been placed upon demonstrating as clearly as possible the details previously unclear or unrecognized and duplication of many excellent earlier light and electron microscopic studies has not been attempted. The typical appearance of the stapes head, neck, arch, crura and footplate has been presented. It is apparent that there exists a high degree of structural specialization particularly in the stapes arch and footplate area.


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