High-Resolution Electron Microscopy, Neutron Diffraction with Isotopic Substitution and X-Ray Absorption Fine Structure for the Characterisation of Active Sites in Oxide Catalysts

2001 ◽  
pp. 1-12 ◽  
Author(s):  
John Meurig Thomas
Keyword(s):  
Electron Microscopy ◽  
Fine Structure ◽  
High Resolution ◽  
Neutron Diffraction ◽  
Active Sites ◽  
High Resolution Electron Microscopy ◽  
Oxide Catalysts ◽  
Isotopic Substitution ◽  
Resolution Electron ◽  
X Ray Absorption

Fine structure of crack in ceramics

1984 ◽  
Vol 42 ◽  
pp. 402-403
Author(s):  
Hiroshi Kakibayashi ◽  
Fumio Nagata
Keyword(s):  
Electron Microscopy ◽  
Fine Structure ◽  
Heat Conduction ◽  
Silicon Nitride ◽  
High Resolution ◽  
High Resolution Electron Microscopy ◽  
Nitrogen Atmosphere ◽  
Ion Etching ◽  
Resolution Electron ◽  
Shock Resistance

Many kinds of ceramics have been developed providing enough insulation, heat conduction or shock resistance. For the characteristics of strong toughness of the ceramics, movements of cracks by applying a force are noteworthy, because most ceramics are hardly distorted.In the present works, behavior of cracks in ceramics is observed with high resolution electron microscopy. Silicon nitride (Si3N4) ceramics were made by sintering in nitrogen atmosphere at 1800°C. Some Y2O3 and AlN were added to assist the sintering. A piece of the ceramics was sliced and polished mechanically untill 20μm in thickness. The specimen was mounted on a single hole grid, and was thinned with an ion etching equipment to be thin enough to observe.

Structure of the “Core” Particles from 50S IS. coli Ribosomes Depleted by LiCl.

1976 ◽  
Vol 34 ◽  
pp. 66-67
Author(s):  
E. Spiess ◽  
H.E. Roth ◽  
W. Hellmann ◽  
F. Jenkins ◽  
M. Boublik
Keyword(s):  
Electron Microscopy ◽  
Protein Synthesis ◽  
Fine Structure ◽  
High Resolution ◽  
High Resolution Electron Microscopy ◽  
Ribonucleic Acids ◽  
Detailed Mechanism ◽  
The Core ◽  
Resolution Electron ◽  
Approaches To Study

Involvement of ribosomes in protein synthesis is well established. Also substantial data about the roles of both ribosomal constituents, proteins and ribonucleic acids, in this process are known. However, the detailed mechanism of the function of ribosomes remains obscure, mainly because of our limited knowledge of the interactions and structural arrangement of ribosomal components.One of the approaches to study ribosome structure involves progressive depletion of proteins and correlation of the protein-depleted ribonucleoprotein cores with function. High resolution electron microscopy has been applied for direct imaging of the changes in the fine structure of depleted ribosomes.

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