High-resolution electron microscopic

Department of Physics, Arizona State University, Tempe, AZ 85287 High Resolution Electron Microscope, Department of Metallurgy, University of Cambridge, Cambridge CB2 3RQ, England... 

Many of the tools required for the nanoscience revolution in materials involve sophisticated experiments requiring leadership, training, and infrastructure. User facilities such as high-resolution electron microscopes, synchrotrons and NMR facilities need to be easily accessible and provide adequate support for efficient experimentation. 

Fig. 9. Magnified Pd EnCat catalysts bead and high-resolution electron microscope image of the surface of the polyurea matrix...

Shirahama, T., and Cohen, A. S. (1967). High-resolution electron microscopic analysis of the amyloid fibril./ Cell Biol. 33, 679-708. 

Yada, K. (1967). Study of chrysotile asbestos by a high resolution electron microscope. Acta Crystallogr. A23 704-707. 

At the end of the twentieth century, in the area of physics, and later in the area of chemistry extraordinarily important experimental results were produced, which gave rise to a new concept of nano-world. Development of high resolution electron microscopes allows detection of not only nano-dimensional particles but also large molecules. New types of matter such as spheroidal molecules with a hollow core (fullerenes and nanotubes), nanosized phases formed by a few atoms of metals... 

Thus, the important question of the secondary structure of the transmembrane elements can only be addressed with models and by structural comparison with other transmembrane proteins for which the structure has been resolved. Detailed information on the structure of transmembrane elements is available for the photoreaction center of Rhodopseudomonas viridis (review Deisenhofer and Michel, 1989), cytochrome c oxidase (Iwata et al., 1995) and the OmpF porin of E. coli (Cowan et al., 1992 Fig. 5.3), amongst others. In addition, high resolution electron microscopic investigations and X-ray studies of bacteriorhodopsin, a light-driven ion pump with seven transmembrane elements, have yielded valuable information on the structure and configuration of membrane-spaiming elements (Henderson et al., 1990 Kimura et al., 1997 Pebay-Peyrula et al., 1997 Fig. 5.4). With the successful crystallization of the photoreaction center of Rhodopseudomonas viridis, a membrane protein was displayed at atomic resolution for the first time (Deisenhofer et al., 1985). The membrane-... 

High-resolution electron microscope pictures of the acetylcholine receptor and mutagenesis studies have enabled a detailed view of the overall structure to be obtai-... 

Figure 2.6 High-resolution electron microscopic (HREM) image of ZSM-5/silicalite. The computer-simulated image is shown as an inset. The corresponding electron diffraction pattern and structural drawing are also given. Notice how the large channels ( 6.5 A diameter) as well as the small ones are revealed in the image. The zig-zag path of inversion symmetry lines joining the interchannel apertures is indicated by the bars drawn. (Courtesy of G.R. Millward J.M. Thomas. University of Cambridge.)...

The most important aspect of electron microscopy in solid state chemistry lies in its ability to elucidate problems that are beyond the capability of X-ray or neutron crystallography. High-resolution electron microscopic (HREM) images show local structures of crystals in remarkable detail in Fig. 2.10 we show the HREM image of Big, W03 obtained with the Cambridge University 500 kV microscope to show the improved resolution compared with the image obtained with a 200 kV microscope... 

Mannweiler, K., Hohenberg, H., Bohn, W., and Rutter, G. (1982) Protein A-gold particles as markers in replica immunocytochemistry. high resolution electron microscope investigations of plasma membrane surfaces J Microsc 126,145-149... 

Vil.i K. "Study ot Chrysotile Asbestos by a High Resolution Electron Microscope." Aria Cry si. 23. 7fW 11 7671. 

Transmission electron microscope (TEM) Scanning transmission electron microscope High-resolution electron microscope Analytical electron microscope... 

The reduction of transition-metal species under the intense electron irradiation of the high-resolution electron microscope used in [37] additionally represents a process that could also lead to Sc-L2>3 data deviating from those presented here, which were measured with the gentle method of soft x-ray absorption. 

High-Resolution Electron Microscopic Studies of Zeolite ZSM—48... 

High-resolution electron microscopic studies employed a modified JEOL-JEM200CX (8) operated at 200 kV with objective lens characteristics Cs = 0.52 mm, Cc = 1.05 mm leading to a theoretical point resolution as defined by the first zero in the phase contrast transfer function of 1.95 A at the optimum or Scherzer (9) defocus position (400 A underfocus). 

We have used both transmission electron microscopy (TEM) and Raman spectroscopy to characterize the different DWNTs samples. TEM allows direct imaging of the DWNTs and gives indications for the presence of other species along with the DWNTs. In the TEM images, we seldom encountered SWNTs or MWNTs. Besides providing information on the nature and dimensions of DWNTs, Raman spectroscopy helps to characterize the purity and quality of the DWNTs. Electron energy loss spectroscopy (EELS), carried out in a high-resolution electron microscope, and X-ray photoelectron microscopy have been employed to determine the elemental composition of the DWNTs. 

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