共查询到20条相似文献,搜索用时 734 毫秒
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H. v. Wartenberg 《Die Naturwissenschaften》1943,31(27-28):307-309
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Gallstones are precipitations of oversaturated bile fluid. They can develop in the gallbladder and in the efferent bile ducts; they are very often correlated with diseases of the gallbladder, bile ducts and neighboring organs. The gallstone disease (cholelithiasis) is increasing continually, especially in developed countries with overcaloric nourished population. Surgical interventions on the biliary tract are the most frequent abdominal operations at present. 相似文献
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Maximilian Zander 《Die Naturwissenschaften》1982,69(9):436-442
The physical and chemical properties of polycyclic aromatic hydrocarbons depend on the size (number of carbon centres) and the topology of the systems. Consequently structure/property relations can be treated as quantitative analogy models with size and topology as the independent variables. This class of compounds is the example par excellence to put forward a general view in chemistry, i.e. topological chemistry. 相似文献
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Prof. Dr. Edmund O. von Lippmann 《Die Naturwissenschaften》1937,25(9):144-144
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S. Hüfner 《Die Naturwissenschaften》1981,68(7):360-370
The principles of photoemission spectroscopy and of its application to problems in chemistry and physics are discussed. Examples will be presented for atoms, molecules, solids and surfaces. The following topics will be discussed: binding energies of core levels (rare gases), binding energies of valence levels (CO), analysis of a valence band spectrum in terms of MO-calculations (C6H6), core polarization (O2), chemical shift (O), plasmon excitations (Be-metal), energy dispersion relations for a solid (Cu), exchange splitting in a metal (Ni), surface states (Si), energy levels of adsorbates (Ni on Au, C6H6 on Ni). 相似文献
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