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  • 1
    Digitale Medien
    Digitale Medien
    The O(1D) yield from O2 photodissociation near H Lyman-α (121.6 nm) (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 1949-1958 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The solar H Lyman-α line is, through O2 photodissociation, an important source of O(1D) production throughout the mesosphere and lower thermosphere. To ascertain the energy balance in this altitude region, it is necessary to know the O(1D) yield across the solar H Lyman-α feature, since H Lyman-α absorption by O2 at ∼80 km accounts for a substantial fraction of the solar radiation absorbed in the mesosphere. An earlier laboratory study had provided a value of 0.44±0.05 for the O(1D) yield at the center of the solar H Lyman-α line, where the profile shows a minimum in intensity due to strong self-reversal of the line. Using tunable laser radiation, we have determined the O(1D) yield from O2 photodissociation across the entire H Lyman-α profile from 121.2 to 121.9 nm, at a spectral resolution of 0.0015 nm (1 cm−1). The results reveal a strongly wavelength-dependent window in the O(1D) yield, the origins of which are explained using calculations based on a coupled-channel Schrödinger-equations model of the O2 photodissociation. The calculations, which show significant isotopic dependence near H Lyman-α, predict that the depth of the quantum-yield window will increase significantly as the temperature is lowered. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.477852
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  • 2
    Digitale Medien
    Digitale Medien
    THE EFFECT OF Ph UPON THE PRECIPITATION OF ZINC AMMONIUM PHOSPHATE (1930)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 52 (1930), S. 120-124 
    Details
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ja01364a019
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  • 3
    Digitale Medien
    Digitale Medien
    Photoelectron distributions from femtosecond pump/probe excitation with chirped probe pulses (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 7631-7636 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: We calculate photoelectron distributions obtained from the two-photon pump/probe ionization of Na2. A first ultrashort pulse prepares a vibrational wave packet in the (2)1∑u+ electronic state. The dynamics is probed by time-delayed ionization caused by a chirped femtosecond laser pulse. Time-resolved photoelectron spectra are determined for different chirp parameters. It is shown that the spectra are very sensitive to the choice of the chirp. In particular the width can be selectively modified and the in- or outward motion of the wave packet can be distinguished by using an appropriately chirped electric field. An analytical expression for the photoelectron spectrum explains its dependence on the chirp parameter. © 1998 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.476198
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  • 4
    Digitale Medien
    Digitale Medien
    Heterogeneity of leaf CO2 assimilation during photosynthetic induction (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 19 (1996), S. 0 
    Details
    ISSN: 1365-3040
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Spatial mid temporal variations in the distribution of photosynthesis over the leaf area were investigated during induction upon illumination of Rosa rubiginosa L. leaves. Gas exchange and maps of relative photosynthetie electron transport activity computed from chlorophyll fluorescence images were simultaneously monitored. In air, after 15 h of dark adaptation, linear electron transport was heterogeneously distributed over the leaf area during the induction. This patchy induction was explained by asynchronous metabolism activation for the first 10 min of illumination, concomitant asynchronous limitation by intrinsic metabolism and stomatal apertures (10–30 min) and finally by only stomatal limitation beyond 30 min. A brief transition to non-photorespiratory conditions after 20 min of illumination under subsaturating irradiance revealed a marked heterogeneity of CO2 assimilation, presumably as a result of heterogeneous stomatal apertures. The frequency distribution of CO2 assimilation was unimodal. During the induction, heterogeneity gradually decreased and photosynthesis was uniform at steady-state. After 10 min of dark adaptation, heterogeneity of linear electron transport activity occurred during the first 15 min of a second induction and mainly resulted from metabolic limitation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-3040.1996.tb00013.x
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  • 5
    Digitale Medien
    Digitale Medien
    Enhancement of muscle regeneration by bone marrow cells in the monkey (1984)
    Springer
    Cellular and molecular life sciences 40 (1984), S. 490-492 
    Details
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Transplantation of muscle minces with and without autogenous bone marrow cells was performed in the monkey. The addition of bone marrow cells markedly enhanced muscle regeneration. The findings suggest a possible clinical application of the technique.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01952401
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  • 6
    Digitale Medien
    Digitale Medien
    Heavy Metals and Acid-Volatile Sulfides in Sediments of the Tijuana Estuary (1997)
    Springer
    Bulletin of environmental contamination and toxicology 59 (1997), S. 113-119 
    Details
    ISSN: 1432-0800
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s001289900452
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  • 7
    Digitale Medien
    Digitale Medien
    Alleged Stimulation of Moulds by Paraffin in Heavy Water (1934)
    [s.l.] : Nature Publishing Group
    Nature 134 (1934), S. 665-665 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] IN a recent communication, Klar1 has questioned the results of experiments which seem to indicate that diplogen exerts a stimulative effect. He would attribute any such increase in growth as has been noted to the presence of organic impurity rather than to the heavy isotope of ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/134665a0
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  • 8
    Digitale Medien
    Digitale Medien
    Zink (1932)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 87 (1932), S. 375-380 
    Details
    ISSN: 1618-2650
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01406454
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  • 9
    Digitale Medien
    Digitale Medien
    Studies of platelets with heavy metal impregnation techniques (1982)
    Springer
    Journal of molecular histology 14 (1982), S. 73-86 
    Details
    ISSN: 1573-6865
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Vaious methods of heavy metal impregnations were performed on human platelets. The optimal technique consisted of glutaraldehyde fixation, incubation in warm uranyl acetate at a pH of 3.5, followed by a double solution of lead and copper, and finally overnight immersion in cold osmium tetroxide. Semi-thin sections, viewed at 90 kV, revealed three types of platelets: (1) ‘reticular’ cells, with a prominent tubular network and very dark granules in a pale cytoplasm; (2) ‘dark’ cells, with an electron-dense cytoplasm; and (3) ‘pale’ cells, with microvesicles and non-staining granules. Pre-treatments with EGTA, aspirin and various platelet activators altered the appearances and proportions of the three cell types. A cell-partitioning two-phase polymer system showed that the sub-grouping is related to surface membrane properties, the cells retained in the top phase being exclusively type 2 ‘dark’ cells. The changes in cell type distribution produced by activation show that metal impregnation may be a useful method for studying structure-function correlations in platelets.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01041131
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  • 10
    Digitale Medien
    Digitale Medien
    The roughening transition of the three-dimensional Ising interface: A Monte Carlo study (1996)
    Springer
    Journal of statistical physics 85 (1996), S. 383-401 
    Details
    ISSN: 1572-9613
    Schlagwort(e): Ising model ; roughening transition ; Monte Carlo ; finite-size scaling ; renormalization group
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We study the roughening transition of an interface in an Ising system on a 3D simple cubic lattice using a finite-size scaling method. The particular method has recently been proposed and successfully tested for various solid-on-solid models. The basic idea is the matching of the renormalization-groupflow of the interface with that of the exactly solvable body-centered cubic solid-on-solid model. We unambiguously confirm the Kosterlitz-Thouless nature of the roughening transition of the Ising interface. Our result for the inverse transition temperatureK r=0.40754(5) is almost two orders of magnitude more accurate than the estimate of Mon, Landau, and Stauffer.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02174211
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