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  • 1
    Electronic Resource
    Electronic Resource
    Synthetic apatites containing Na, Mg, and CO3 and their comparison with tooth enamel mineral (1983)
    Springer
    Calcified tissue international 35 (1983), S. 169-171 
    Details
    ISSN: 1432-0827
    Keywords: Na, Mg, and CO3 ; Carbonated apatite ; Tooth enamel ; IR spectrum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary Apatites containing Na, Mg, and CO3 in amounts occurring in tooth enamel mineral were synthesized by precipitation from aqueous solutions. The X-ray diffraction patterns showed only apatitic reflections, which were somewhat broader than those of enamel. X-ray Guinier photographs resulted in diffuse reflections from which the lattice parameters could not be determined. The infrared (IR) absorption spectrum of the synthetic samples was practically identical with that of tooth enamel. However, after heating the samples for 1/2 h at a temperature between 300 and 600°C, no absorption peak was found at 2340 cm−1 as in the IR spectrum of tooth enamel after heating.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02405026
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Induction of precocious maturation in masculinized Atlantic salmon by treatment with sustained-release LHRHa and testosterone (1998)
    Springer
    Aquaculture international 6 (1998), S. 261-268 
    Details
    ISSN: 1573-143X
    Keywords: Atlantic salmon (Salmo salar) ; LHRH ; Masculinization ; Monosex production ; Testosterone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effect of treating immature, masculinized, Atlantic salmon, Salmo salar, with testosterone or [Des-Gly10] D-Ala6-LHRH ethylamide (LHRHa), either alone or in combination, over an 81 day period was evaluated as a method for accelerating maturation. Two sustained-release LHRHa implants were compared: ethylene vinyl acetate copolymer (EVAC) and silicone elastomer. Animals primed with testosterone did not express advanced spermatogenesis when compared against control salmon (p 〉 0.05). However, fish primed with testosterone, followed by sham, LHRHa EVAC, or LHRHa silicone elastomer implants expressed increased (p 〈 0.05) gonadosomatic index (GSI) when compared with values derived from day 0 of the study. Neither spermatogenesis nor GSI were affected when salmon were treated with LHRHa alone, irrespective of the vehicle employed. In contrast, spermatogenesis was significantly (p 〈 0.05) advanced in testosterone-treated fish, which were administered LHRHa by EVAC, when compared with groups that received individual treatment only. © Rapid Science Ltd. 1998
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009255815481
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Simple proof of the pairing theoremThis article is dedicated to the memory of Professor Jean-Louis Calais. (1997)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 63 (1997), S. 31-33 
    Details
    ISSN: 0020-7608
    Keywords: Chemistry ; Theoretical, Physical and Computational Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A very simple constructive proof of Löwdin's pairing theorem is presented. © 1997 John Wiley & Sons, Inc.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 4
    Electronic Resource
    Electronic Resource
    The chemical Hamiltonian approach for treating the BSSE problem of intermolecular interactions (1998)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 70 (1998), S. 41-63 
    Details
    ISSN: 0020-7608
    Keywords: Chemistry ; Theoretical, Physical and Computational Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The two alternative treatments of the BSSE problem of intermolecular interactions - the a posteriori counterpoise (CP) correction scheme of Boys and Bernardi (BB) and the a priori exclusion of the basic-set superposition error (BSSE) by using the “chemical Hamiltonian approach” (CHA) - are discussed. Alternative interpretations of the BB scheme are compared and some problems and paradoxes are described which can consistently be resolved by introducing a hierarchical scheme of N-body CP corrections. In CHA, one identifies those terms of the Hamiltonian (or Fockian) which cause the BSSE - the same terms cause the energy lowering in the “ghost orbitals” calculations; by omitting these terms from the Hamiltonian (Fockian), one can calculate BSSE-free wave functions, by use of which the BSSE-free values of the energy and of other physical quantities can be obtained in a conventional manner. CHA was successfully applied at the SCF and DFT levels of theory, including systems containing three or more interacting subsystems or even infinite periodic chains. The pivot full CI calculations performed for small model systems showed the applicability of the approach for treating electron correlation as well. Most recently, a CHA version of the MP2 theory and a second-order BSSE-free intermolecular PT have also been tested; they are also applicable for complexes of larger size. It was observed, at any level of theory, that the results given by the a posteriori BB and a priori CHA schemes converge to each other much faster than BSSE disappears from the uncorrected results.   © 1998 John Wiley & Sons, Inc. Int J Quant Chem 70: 41-63, 1998
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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