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'Electron Microscopy' in keywords Facet   section ZfN Section C:Volume 043  [X]
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1988 (2)
1Author    EgbertJ. Boekema, Günter Schmidt, Peter Gräber, JanA. BerdenRequires cookie*
 Title    Structure of the ATP-Synthase from Chloroplasts and Mitochondria Studied by Electron Microscopy  
 Abstract    The structure of the ATP-synthase, F 0 F,, from spinach chloroplasts and beef heart mitochon-dria has been investigated by electron microscopy with negatively stained specimens. The deter-gent-solubilized ATP-synthase forms string-like structures in which the F 0 parts are aggregated. In most cases, the F, parts are arranged at alternating sides along the string. The F 0 part has an approximate cylindrical shape with heights of 8.3 and 8.9 nm and diameters of 6.2 and 6.4 nm for the chloroplast and mitochondrial enzyme, respectively. The F, parts are disk-like structures with a diameter of about 11.5 nm and a height of about 8.5 nm. The F, parts are attached to the strings, composed of F n parts, in most cases, with their smallest dimension parallel to the strings. The stalk connecting F 0 and F, has a length of 3.7 nm and 4.3 nm and a diameter of 2.7 nm and 4.3 nm for the chloroplast and mitochondrial enzyme, respectively. 
  Reference    Z. Naturforsch. 43c, 219—225 (1988); received December 1 1987 
  Published    1988 
  Keywords    ATP-Synthase, Enzyme Structure, Electron Microscopy 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0219.pdf 
 Identifier    ZNC-1988-43c-0219 
 Volume    43 
2Author    DrBernhard WolfRequires cookie*
 Title    Elektronen-Energie-Verlust-Spektroskopische Untersuchungen an Luftfiltern zur Bewertung der Luftqualität Electron-Energy-Loss-Spectroscopical Investigations on Air Filters for the Analysis of the Air Quality  
 Abstract    In trace analysis it is more and more attempted to replace wet-chemical detection procedures by methods which allow a quantitative analysis without any material disintegration, but on exploiting the characteristic physical properties of the components searched for. Based on a procedure for physical and biological valuation of the air quality by means of X-ray microanalysis (WDX/EDX), a procedure which was previously developed by our group, we deepened our investigations by the help of electron-energy-loss-spectroscopy (EELS). The combination of that procedure with EELS proved to be very advantageous as it revealed a high sensitivity as well as a high energy resolution. The main advantages are to be found in the simple arrangement of the sample detector and in the fact, not only being able to examine deposits microscopically, but also to analyze them chemically without disintegrating the material. Thus loss of material and denaturation are largely excluded. 
  Reference    Z. Naturforsch. 43c, 155—161 (1988); received November 4 1987 
  Published    1988 
  Keywords    Air Analysis, Filter Detection, Electron Microscopy, Electron-Energy-Loss-Spectroscopy 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0155.pdf 
 Identifier    ZNC-1988-43c-0155 
 Volume    43