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  • 1
    Electronic Resource
    Electronic Resource
    Determination of Calcium or Zinc Additives in Lubricating Oils and Concentrates (1957)
    s.l. : American Chemical Society
    Analytical chemistry 29 (1957), S. 1223-1223 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60128a036
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  • 2
    Electronic Resource
    Electronic Resource
    Partial purification and initial characterization of phytochrome from the mossAtrichum undulatum P. Beauv. grown in the light (1989)
    Springer
    Planta 178 (1989), S. 436-442 
    Details
    ISSN: 1432-2048
    Keywords: Atrichum (phytochrome) ; Bryophyta ; Phytochrome from green moss
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The extraction and partial purification of phytochrome from light-grownAtrichum undulatum P. Beauv., a chlorophyllous moss, is described. Polyethyleneimine and salt fractionation followed by hydroxyapatite and Affi-gel-blue chromatography were used to separate phytochrome from chlorophyll, and to purify the pigment. All steps were performed in the presence of Triton X-100 which improved the yield by a factor of about three. The protein has a molecular weight some-what larger than that ofAvena phytochrome (124 kDa), as determined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and immunoblot analysis. It cross-reacts with a monoclonal antibody against phytochrome from etiolated corn (Zea) and a polyclonal antibody against phytochrome from etiolated oat (Avena), and its photoreversibility is similar to that of phytochrome from greenAvena.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00963812
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  • 3
    Electronic Resource
    Electronic Resource
    Storage of the phytochrome-mediated phototropic stimulus of moss protonemal tip cells (1988)
    Springer
    Planta 175 (1988), S. 39-49 
    Details
    ISSN: 1432-2048
    Keywords: Calcium (chlorotetrcycline fluorescence) ; Ceratodon ; Monensin ; Phototropism (moss) ; Phytochrome (moss) ; Protonema (moss) ; Tip growth (moss protonema)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A phytochrome-regulated phototropic response of the moss Ceratodon purpureus was investigated. Chlorotetracycline (CTC) was used to visualize membrane-associated calcium gradients in the tip cell of moss caulonemal filaments. A tip-to-base Ca2+ gradient was observed. The ionophore monensin rapidly inhibited the growth of the tip cell and abolished the CTC fluorescence. Six hours after transferring to inhibitor-free medium, protonemal growth resumed and reached the normal growth rate within 12 h. The growth was accompanied by a reappearance of the CTC-fluorescence gradient. Unilateral irradiation given during the monensin treatment or after the treatment during the period when growth inhibition persisted led, with the re-initiation of growth, to a typical positive phototropic bending in complete darkness. Far-red light applied just before the growth response started, or during growth inhibition, abolished the phototropic response. The phytochrome-mediated signal was qualitatively (position) and quantitatively (degree of bending) memorized. Signal perception and response could be separated temporally. This result indicates that at least under some circumstances, e.g. under the influence of monensin, the phytochrome-mediated signal can be stored for several hours in darkness. Calcium seems to be essential for the processing of polar growth only. A specific function (second messenger) in phytochrome-dependent signal transduction could not be confirmed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00402880
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  • 4
    Electronic Resource
    Electronic Resource
    Rate equations for the dynamics of mixed valence ions (1987)
    Springer
    The European physical journal 65 (1987), S. 305-311 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The high temperature dynamics of mixed valent 4f-shells is studied by means of rate equations. Symmetries and detailed balance considerably reduce the number of independent rates. Rates are calculated by Fermi's golden rule. The approach presented here provides an elementary and transparent reproduction of results previously obtained using Mori's formalism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01303716
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  • 5
    Electronic Resource
    Electronic Resource
    Selection rules for hybridization (1989)
    Springer
    The European physical journal 75 (1989), S. 331-334 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Selection rules for the hybridization of the crystal-field levels of a magnetic ion are investigated by group theoretical methods. They appear only in a few cases. In absence of strict selection rules the possibility for drastic quantitative differences in the hybridization of different levels is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01321820
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  • 6
    Electronic Resource
    Electronic Resource
    Phase transition to the resonating valence bond state (1989)
    Springer
    The European physical journal 74 (1989), S. 67-74 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A Ginzburg-Landau expansion for the free energy functional of the resonating valence bond state is performed for the mean field approximation (MFA) and for a functional integral approach (FIA) which includes correlations. Phase diagrams obtained in both approximations are presented. The FIA differs form the MFA in three main aspects: (i) Above the mean field transition temperature an instability exists towards the formation of degenerate singlet pair states, indicating the onset of the RVB state. (ii) The extendeds-wave phase is favoured over the extendedd-wave phase. (iii) Phase fluctuations are included, destroying off-diagonal order in the absence of holes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01307239
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  • 7
    Electronic Resource
    Electronic Resource
    Orbital anisotropy of Kondo ions (1989)
    Springer
    The European physical journal 75 (1989), S. 201-210 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The striking differences which are often observed in the behaviour of unstable ions with the same valence can be traced to different orbital splittings. This suggestion is discussed in terms of a degenerate Anderson model which is treated in the single ion non-crossing approximation (NCA). Using analytical methods to solve the NCA equations of the anisotropic model the parametrization of the theory is made transparent and the numerical solution of the NCA atT=0 is simplified considerably. The influence of a low ground state degeneracy of the magnetic impurity on the drop of the Kondo temperature is emphasized. Numerical results for the NCA equations are given for a cerium impurity with either a doublet or a quartet ground state. Comparison with the mean field solution of the anisotropic model is made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01308001
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  • 8
    Electronic Resource
    Electronic Resource
    The Hubbard model at high dimensions: some exact results and weak coupling theory (1989)
    Springer
    The European physical journal 76 (1989), S. 211-217 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recently it was shown that the theory of systems of correlated fermions on a lattice is greatly simplified in the limit of high dimensions as compared to lattice systems of dimensions 2 or 3 or to isotropic systems. We discuss here the implications of the limit of high dimensions on the single particle propagator of the Hubbard model. It is shown that all the typical Fermi liquid features are retained at high dimensions. Some exact results are obtained for infinite dimension: the shape of the Fermi surface as well as the density of states at the Fermi surface are not renormalized at all by the Coulomb interaction as long as the symmetry of the system is not broken. The self-consistent weak coupling theory is cast into a form which is solved numerically with very little effort.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01312686
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  • 9
    Electronic Resource
    Electronic Resource
    Dynamics of mixed valent Europium and Samarium systems (1985)
    Springer
    The European physical journal 60 (1985), S. 363-372 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract For mixed valent Europium and Samarium systems dynamical magnetic and charge susceptibilities are calculated at temperatures above their fluctuation temperature using Mori's formalism. The low-lying spin-orbit excited level of the 4f 6 -configuration leads to additional relaxation modes and to conspicuous temperature effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01304457
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  • 10
    Electronic Resource
    Electronic Resource
    Threshold exponents of pseudo-particle spectra of Kondo impurities (1988)
    Springer
    The European physical journal 73 (1988), S. 225-230 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Pseudo-particle propagators or resolvents are known to be important ingredients in the theory of a degenerate Anderson impurity. At low temperatures they show conspicuous threshold behavior which is, however, described only approximately in perturbative theories like the non-crossing approximation. In this paper we derive the correct values of the threshold exponents from an argument due to Schotte and Schotte. For degeneracyN=1 we provide a complete perturbative proof of the validity of our results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01305740
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