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  • 1
    Digitale Medien
    Digitale Medien
    Besprechungen (1930)
    Springer
    Naturwissenschaften 18 (1930), S. 88-92 
    Details
    ISSN: 1432-1904
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie , Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01492431
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  • 2
    facet.materialart.
    Unbekannt
    Besprechungen (1930)
    Springer
    Details
    Publikationsdatum: 1930-01-01
    Print ISSN: 0028-1042
    Digitale ISSN: 1432-1904
    Thema: Biologie , Chemie und Pharmazie , Allgemeine Naturwissenschaft
    Publiziert von Springer
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    AKTUELLE ARTIKEL
  • 3
    Digitale Medien
    Digitale Medien
    Lattice dynamics of a pair-potential model of α-quartz (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 8357-8361 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: A pair potential for SiO2 proposed by Tsuneyuki, Tsukada, Aoki, and Matsui [Phys. Rev. Lett. 61, 869 (1988)] is used to calculate a range of lattice dynamical properties of α-quartz. The potential energy of the structure is minimized, and the phonon frequencies are calculated for the structural parameters corresponding to the energy minimum. Frequencies calculated throughout the Brillouin zone are used to construct a frequency distribution function and the harmonic contributions to the thermodynamic functions are calculated. The coefficients of thermal expansion perpendicular and parallel to the c axis are calculated in a perturbative approximation. The expansion coefficient parallel to the c axis is found to be negative at low temperatures, in agreement with experiment. The elastic, dielectric, and piezoelectric constants are also calculated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.461262
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  • 4
    Digitale Medien
    Digitale Medien
    Investigation of deep levels in PbI2 by photoinduced current transient spectroscopy (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 293-301 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Deep levels in PbI2 have been investigated by photoinduced current transient spectroscopy for the first time. By separating the signal processing from the data acquisition it was possible to analyze the transient using different methods, in particular a four-gate treatment which allows to clear the detrapping current of uncontrolled changes of the recombination lifetime of thermally released carriers. Three hole traps located at 0.30, 0.47, and 0.66 eV have been detected and the corresponding thermal capture cross sections evaluated. In addition a photomemory effect has been evidenced. The main features of the excited state of the crystal are increased photosensitivity, neutralization of hole traps, and residual conductivity. It is believed that macroscopic recombination barriers acting as minority carrier traps under optical excitation are responsible for this phenomenon. The presence of these extended defects is probably related to the layered structure of PbI2. An energy model is proposed on the basis of which the observed logarithmic time dependence of the photosensitization at room temperature can be predicted. The model allows also to give a plausible interpretation for all the characteristic features of the photomemory effect and for various results previously reported by other authors.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.334803
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  • 5
    Digitale Medien
    Digitale Medien
    Carotenoid Distribution in Bleached Substrains of Euglena gracilis (1958)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 5 (1958), S. 0 
    Details
    ISSN: 1550-7408
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: SYNOPSIS. Several substrains of Euglena gracilis var. bacillaris made chlorotic by treatment with pyribenzamine or streptomycin, or by growth at high temperature (35–36°C.), have been examined for their carotenoid content. They differ from the normal green strain both qualitatively and quantitatively. Some strains produce no detectable carotenoids while the carotenoid concentration in the strains producing most is at best only one-fifth that of the normal strain. In all substrains producing carotenoids, the carotene fraction consists of β-carotene accompanied by some members of the phytofluene series. In only two of these substrains, HB-G and PBZ-G3, are xanthophylls produced in significant amounts. In HB-G, the main pigment is echinenone, and in PBZ-G3 it is zeaxanthin. The significance of these findings is briefly discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1550-7408.1958.tb02568.x
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  • 6
    Digitale Medien
    Digitale Medien
    Cellular Responses to Thermal and Photo Stress I. Euglena and Chlamydomonas (1962)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 9 (1962), S. 0 
    Details
    ISSN: 1550-7408
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: SYNOPSIS. Euglena and Chlamydomonas were cultured in an organic medium in the dark and at several light intensities (15, 60 and 150 ft-c) at temperatures from 20d̀ to 35d̀C. Below 32.5d̀, growth of Euglena was independent of light. Chlamydomonas was light dependent at all temperatures where growth occurred; there was no growth in the dark, at 15 ft-c, or at temperatures above 32.5d̀. At 35d̀, growth of Euglena became inversely light dependent; the higher the illumination, the poorer the growth. Multinucleated, giant euglenas were found at 35d̀, a greater percent of abnormal cells appearing at the higher light intensities. Monsters were not observed in Chlamydomonas.To explain the growth-inhibiting, monster-inducing effect of elevated temperatures on Euglena, it is postulated that a dark-formed thermosensitive protein, essential for normal cell division, is denatured. Light may increase the effect of heat on chlorophyll and the chloroplast, possibly by being converted to intraplastidic heat through the plastid carotenoids, thus having some indirect synergistic role in the phenomenon.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1550-7408.1962.tb02631.x
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  • 7
    Digitale Medien
    Digitale Medien
    Cellular Responses to Thermal and Photo Stress II. Chlorotic Euglenids and Tetrahymena (1962)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 9 (1962), S. 0 
    Details
    ISSN: 1550-7408
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: SYNOPSIS. Three chlorotic Euglena substrains, PBZ-G4, SM-L1, and HB-G, were cultured in light and dark at 25° and 33–35°C. These permanently chlorophyll-less flagellates with different carotenoid distributions were originally derived from a photosynthetic stock culture. Astasia longa, a naturally pigmentless flagellate, and the ciliate Tetrahymena were also employed.None of the organisms were light-dependent at 25°C. At high temperatures only the Euglena substrains showed an effect of light on growth: PBZ-G4 was inhibited, as was the photosynthetic parent strain, whereas SM-L1 and HB-G were stimulated. In all three substrains, monster forms were produced at elevated temperatures; SM-L1 and HB-G were multinucleated, while PBZ-G4 had an enlarged, single nucleus. A small percentage of astasias became multinucleated and almost all the tetrahymenas became giants when cultured at high temperature but neither was affected by light.Light-temperature interactions in the nonphotosynthetic substrains of Euglena are, at present, unexplained. The results are discussed in relation to the carotenoid content and the possible site of interaction. The major factor inducing abnormality is thermal stress.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1550-7408.1962.tb02645.x
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  • 8
    Digitale Medien
    Digitale Medien
    Some Biological Characteristics of Chlorotic Substrains of Euglena gracilis. (1958)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 5 (1958), S. 0 
    Details
    ISSN: 1550-7408
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: SYNOPSIS. It has been assumed by others that green euglenas and derived bleached forms are physiologically equivalent except for chlorophyll and plastids. Some workers, however, have remarked upon differences which might depend on the mode of bleaching.Several hitherto undescribed chlorotic substrains of E. gracilis var. bacillaris were examined for pigment alteration, growth under a variety of conditions, and ability to withstand high temperature. These studies indicated physiological variation in the different chlorotic substrains. Although all were apparently chlorophyll-less and aplastidic, only one seemed completely achromatic. The carotenoid content of others varied. Metabolic changes manifested by altered pigmentation may reflect enzymatic variation caused by the chlorosis-inducing agents.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1550-7408.1958.tb02539.x
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  • 9
    Digitale Medien
    Digitale Medien
    Intrinsic Cotton Effects In Collagen And Poly-L-Proline1,2 (1963)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 85 (1963), S. 644-646 
    Details
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ja00888a041
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  • 10
    Digitale Medien
    Digitale Medien
    Relationship between weak ferromagnetism, superconductivity, and lattice parameter in the A2−x−y〉BxCeyCuO4 (A,B≡La, Pr, Nd, Sm, Eu, Gd, Y) compounds : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6723-6725 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report the results obtained by x-ray, dc magnetization, ac magnetic susceptibility, microwave magnetic absorption, and electron paramagnetic resonance of the magnetic and superconductive properties of a large series of compounds of the form A2−x−yBxCeyCuO4 with A,B≡La, Pr, Nd, Sm, Eu, Gd, and Y. For y=0 antiferromagnetic ordering of the copper moments is present at TN≈280 K for all the compounds formed in the tetragonal T' phase. Weak ferromagnetism (WF) associated with the canting of the copper moments is observed in all the compounds with a lattice parameter, a〈a0, a0≈3.91 A(ring), regardless of the rare-earth (R) ions present in the system. Superconductivity is observed only in the Ce-doped compounds with a(approximately-greater-than)a1, a1≈3.92 A(ring). The maximum onset temperature Tc is found for a≈3.95 A(ring). A phase diagram was obtained by varying the lattice parameter size as a function of A, B, and x. The correlation between the appearance of WF in the undoped compounds and the disappearance of superconductivity in the Ce-doped systems is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.356982
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