Mössbauer and infrared spectrometry of lizardite-1T from Monte Fico, Elba     

Y. Fuchs  J. Linares  M. Mellini 《Physics and Chemistry of Minerals》1998,26(2):111-115

A well crystallized and homogeneous specimen of lizardite from Monte Fico, Elba, Italy, has been studied by Mössbauer and Fourier transform infrared (FTIR) spectrometries. One of the aims was the determination of the oxidation state and the distribution of iron in the structure of this reference sample. Mössbauer data indicate the presence of octahedral ferrous iron, octahedral ferric iron and tetrahedral ferric iron (59.9, 31.3 and 8.8% of total iron, respectively). The existence of only one octahedral site, previously suggested by X-ray structure refinement, is confirmed. The occurrence of tetrahedrally coordinated iron is indicated also by FTIR spectrometry, in particular by the presence of an absorption band at 790 cm^–1. Based also on new electron microprobe data, the improved crystal chemical formula for lizardite from Monte Fico is: (Mg_2.74Fe²⁺ _0.10Fe³⁺ _0.05Al_0.11)_Σ=3.00 ?· (Si_1.94Al_0.05Fe³⁺ _0.01)_Σ=2.00O_5.05(OH)_3.95.  相似文献   

Phosphataufnahme und Gasstoffwechsel von Myriophyllum spicatum und Cladophora glomerata     

G. Weise  I. Bahr  S. Fuchs  L. Schürmann 《洁净——土壤、空气、水》1986,14(5):475-484

The P-uptake by Myriophyllum spicatum and Cladophora glomerata is investigated in the small phytotron at 5 and 15° in permanent light (11,5 klx) and in permanent darkness. Parallel to this, the gas-metabolism-physiological behaviour is determined by means of IRGA methods. A nutrient solution acc. to. Knop with P from KH₂PO₄ in the concentrations of 0.01, 0.05 and 0.1 mg/1 P was used as the nutrient medium. Both species take P from the medium till the species – and development – specific pool is filled (6 … 7.5 mg/g P). Towards the end of the period of vegetation one can expect a P-exudation. The P-uptake is temperature-dependent: Cladophora attains the highest P-storage at low temperatures, Myriophyllum, at higher temperatures. Due to their longer phases of growth and lower proneness to traumas, submerse spermatophyta are superior to filamentous algae with respect to the long-time elimination effects.  相似文献   

Zum Einfluß von Rückständen von Zink- und Bleiverbindungen im Wasser auf die Assimilation von Fontinalis antipyretica     

G. Weise  G. Burger  S. Fuchs  L. Schürmann 《洁净——土壤、空气、水》1985,13(1):25-34

The carbon-dioxide assimilation of Fontinalis antipyretica is inhibited by 100 mg/1Zn²⁺ or Pb²⁺, without a lethal effect being caused. With increasing time of exposure from one to six days the threshold value of toxicity is lowered and at the same time the net assimilation is reduced within the range of concentration of 0.1 mg/1. In the ecological optimum of the environmental conditions the toxicity is weaker than under other unfavourable environmental conditions at the same time. Therefore, the photoecologically optimum illumination of 1200 lx is an effective bioprotector against phytotoxic lead ion concentrations, so that at 1200 lx also at a comparatively high load a positive photosynthesis balance can be maintained. In the dark, in the first hour after the application of the lead ions dissimilation is a function of concentration, subsequently the respiration differences decrease very much in the range between 0 and 100 mg/1 lead(II)-ions. Stimulating effects could be demonstrated only by 0.01 mg/1 Pb²⁺ and only for the carbondioxide assimilation.  相似文献   

Einfache Meßeinrichtung zur kontinuierlichen Erfassung der Zelldichte von Algensuspensionen     

S. Fuchs  M. Weishaupt 《洁净——土壤、空气、水》1984,12(5):567-568

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Zeitgesteuerte Endlos-Filmbandführung zur erweiterten Nutzung eines Fließgewässerlaboratoriummodells für Phytobenthosuntersuchungen     

M. Gebhart  S. Fuchs 《洁净——土壤、空气、水》1984,12(5):569-573

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International symposium continental intraplate tectonics     

Fuchs  K. 《GeoJournal》1983,7(1):91-91

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THE MINERALOGY OF A RHÖNITE-BEARING CALCIUM ALUMINUM RICH INCLUSION IN THE ALLENDE METEORITE     

Louis H. Fuchs 《Meteoritics & planetary science》1978,13(1):73-88

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Computation of Synthetic Seismograms with the Reflectivity Method and Comparison with Observations   总被引：11，自引：0，他引：11  

K. Fuchs  G. Müller 《Geophysical Journal International》1971,23(4):417-433

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Scaling behaviour of a scalar field model of dark matter haloes     

B. Fuchs  E. W. Mielke 《Monthly notices of the Royal Astronomical Society》2004,350(2):707-709

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Comment on “General relativity resolves galactic rotation without exotic dark matter” by F.I. Cooperstock and S. Tieu     

Burkhard Fuchs  Stefanie Phleps 《New Astronomy》2006,11(8):608-610

The general relativistic model of Cooperstock and Tieu, which attempts to fit rotation curves of spiral galaxies without invoking dark matter, is tested empirically using observations of the Milky Way. In particular, predictions for the mass density in the solar neighbourhood and the vertical density distribution at the position of the Sun are compared with observations. It is shown that the model of Cooperstock and Tieu, which was so constructed that it gives an excellent fit of the observed rotation curve, singularly fails to reproduce the observed local mass density and the vertical density profile of the Milky Way.  相似文献