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  • 1
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The first (1.65-3.16 jxm) and second (0.76-1.54 jjim) orders of the grating spectrometer are separately focused onto two 64-pixel PbS arrays by a dichroic beam-splitter. The resulting resolution is 0.025 and 0.0125 |xm per pixel in the first and second order, respectively. The telescope is 2.5 cm ...
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  • 2
    ISSN: 1468-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A preoccupation with aesthetics and a real desire for social development has brought about an increase in the demand for safe, effective depigmenting products among African and Asian populations.For many years now, we have used an experimental model which uses the black mouse CS BL/6/JICO.As a result of developing needs and the necessity to check the results obtained from animals on humans, we have had to change the methodology in order to take into account the specific characteristics of human skin.After a summary of the protocol used on the mouse, here you will find a description of the technical changes which had to be made in order to carry out the study on humans.The results of a comparative test between the two models are given. This was carried out with a cosmetic preparation containing 2% hydroquinone introduced via a vector that facilitates its absorption.The depigmentation observed in the animal model was not found significant in humans.Taking into consideration the large number of differences between individuals, and in order to demonstrate a significant result on humans, it would be necessary to use a larger experimental group, treated for a longer period than that normally used with animals.
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  • 3
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Despite evident similarities, the Argyre basin exhibits important differences with regard to its lunar counterparts, as the Orientale basin. These differences concern both the stratigraphy of the impact related units and the tectonics of these areas. The Argyre basin is not surrounded by ejecta with radial facies, but by an annulus of structurally uplifted and faulted preimpact basement. That is different from the lunar basins which exhibit a large annulus of radial facies but only a narrow ring of uplifted terrains. The Argyre basin is surrounded by five or more outer discontinuous rings extending far away from the basis edge. That is different from the lunar basins which are surrounded by only one, continuous and closer ring. These differences could be partially explained by the external conditions, but mainly by differences in the crustal properties and lithospheres thickness which would have been thinner on Mars than on the Moon.
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  • 4
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract In order to explain the development of Central Valles Marineris, a new morphostructural model is proposed. This model involves three major phases, including (i) initiation of graben patterns and pit crater chains under an early extensional phase, (ii) formation of wide grabens during major faulting, local rifting, and erosional phase, (iii) late faulting and secondary volcanic activity, possibly related to renewed updoming of East Tharsis. Based on detailed morphologic studies presented in a companion paper (Peulvast and Masson, this issue), the role of erosional processes in Central Valles Marineris landforming is discussed.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Earth, moon and planets 61 (1993), S. 219-248 
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The central Valles Marineris is the widest part of the equatorial trough system of Mars. Melas Chasma and parts of Coprates and Candor Chasmata provide some of the clearest clues on the relationships between erosional landforms, deposits and various volcanic and tectonic features. A detailed geomorphic study of the troughs allows the identification of faults and other structures in most parts of this area, in spite of local obliteration by erosional and depositional processes. Tectonic control on erosional landforms appears mainly in the northern walls of Melas Chasma and in the edge of the inner plateau above the trough floor. Longitudinal major faults are identified only along the northern wall. However the trough may not be a simple half graben: another fault line is inferred inside Melas Chasma southern walls along the edge of a wide bench of layered deposits. A deep and relatively narrow graben linking those of Ius and Coprates Chasmata appears to be downfaulted inside a wider basin with eroded sides. Transverse or oblique faults control some outlines of these erosional landforms, whereas a few monoclines or faults restricted to the basin beds reveal compressional stresses or differential vertical movements related to the basin development.
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  • 6
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The distribution analysis of the ganymedean pedestal craters shows a very good correlation between them and the grooved terrains. These craters seem to be the earliest post-grooved impacts. The presence of ‘tectonized’ pedestal craters is also noted. This type of crater is the only one lying on the grooved terrains and being affected by the grooves. Assuming that a lowering of the terrain's viscosity is the determining factor for the presence of pedestal craters, we conclude that at the time of their formation, the grooved terrains have a lower viscosity than the other terrains. Moreover, using the density ratio between non-pedestal craters and pedestal craters, a relative low viscosity state's duration time is calculated. Based on the density ratio between pedestal craters and tectonized pedestal craters, a grooved terrains formation's time is also calculated. These two times are of the order of 107 yr and 106 yr respectively. This period of low viscosity may be partly due to internal heating.
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