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  • 1983  (118)
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  • 1983  (118)
  • 1
    In: The Tax Adviser, Oct, 1983, Vol.14(10), p.601
    Keywords: Pension Funds ; Sex Discrimination Against Women
    ISSN: 0039-9957
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  • 2
    Language: English
    In: The Journal of Chemical Physics, 15 December 1983, Vol.79(12), pp.5887-5893
    Description: Irradiation into either of the two resonance transitions of Cr atoms in Kr matrices results in strong bleaching of the atomic absorptions and simultaneous growth of two Cr 2 dimer bands. The lower energy band of Cr 2 at ∼470 nm is the well‐known 1 Σ + u  →  1 Σ + g transition. The higher energy band at ∼340 nm we assign to the 1 Π u  ←  1 Σ + g transition which occurs at almost the same energy as, and is therefore obscured by, the y 7 P 0  ←  a 7 S transition of normally present Cr atoms in Kr (and Ar) matrices. Laser induced fluorescence from the ∼470 nm band gives a broad, featureless emission presumably because of extensive predissociation after cage relaxation of the excited 1 Σ + u state. Emission after excitation of 1 Π u  ←  1 Σ + g transition yields a four member progression with spacing of ∼240 cm − 1 . The spectrum is consistent with emission from a 3 Σ g ‘‘trap’’ level to a lower lying 3 Σ u state, ∼8000 cm − 1 above ground. An energy level diagram of the Cr 2 molecule is presented which incorporates all of the spectroscopic information available on the dimer.
    ISSN: 0021-9606
    E-ISSN: 1089-7690
    Source: © 1983 American Institute of Physics (AIP)〈img src=http://exlibris-pub.s3.amazonaws.com/AIP_edited.gif style="vertical-align:middle;margin-left:7px"〉
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  • 3
    Language: English
    In: The Biochemical journal, 01 March 1983, Vol.209(3), pp.587-95
    Description: The alpha-helix-rich particle of Mr 50 200, derived by limited alpha-chymotryptic digestion of the solubilized microfibrillar proteins from wool alpha-keratin, consists mainly of polypeptide-chain segments of Mr 12 500 (fraction ChC) and 25 000 (fraction ChB). The 12 500-Mr segments are of two types (I and II), which are derived from different polypeptide chains of the microfibrillar complex. Each of these type-I and type-II segments partially self-associates in benign solvents to form either dimers or tetramers. When mixed, the two segments show changes in physical properties (alpha-helix content, difference spectra and molecular weight) indicative of complex-formation. The maximum changes occur when the two segments are mixed in an equimolar ratio. Complexes isolated after rapid dialysis of mixtures from 8 M-urea solution were examined by various methods. A tetrameric structure is the main product formed in all cases, and the maximum amount of tetramer is obtained from equimolar mixtures of the type-I and type-II polypeptides. When urea is removed by dialysis from the unfractionated 12 500-Mr segments (fraction ChC) or from the alpha-helix-rich particle itself, a similar complex of Mr 50 000 is formed. The physical properties of these reconstituted entities (alpha-helix content, molecular weight, thermal stability and exposure of tyrosine residues) are similar to those of the original alpha-helix-rich particle. Cross-linking experiments with dimethyl suberimidate are in agreement with a four-chain complex for the reassembled structures. A pair of double-stranded alpha-helices is proposed for the particle, and is considered to be an integral part of the microfibrillar complex in wool alpha-keratin.
    Keywords: Contractile Proteins ; Extracellular Matrix Proteins ; Elastic Tissue -- Analysis ; Wool -- Analysis
    ISSN: 0264-6021
    E-ISSN: 14708728
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  • 4
    Language: English
    In: Analytical Biochemistry, 1983, Vol.130(1), pp.191-198
    Description: High performance liquid chromatography on a strong cation-exchange column has been used to determine L-ascorbic acid in algae and in their growth media by electrochemical detection. Work-up procedures, optimized conditions for separation of L-ascorbic acid, and the noninterference of several sugars, lactones, and acids with this assay are described.
    Keywords: Chemistry ; Anatomy & Physiology
    ISSN: 0003-2697
    E-ISSN: 1096-0309
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  • 5
    Language: English
    In: The Journal of Chemical Physics, 15 March 1983, Vol.78(6), pp.2889-2898
    Description: Three molybdenum–dinitrogen complexes [MoN 2 ,Mo x (N 2 ) and Mo(N 2 ) 3 ] have been synthesized in Kr matrices and characterized by means of the effects of isotopic substitution on the dinitrogen stretching frequencies. The Mo–N force constants calculated from these spectra are found to be 17.21±0.02 mdyn/Å for MoN 2 and f r =18.72 mdyn/Å and f r r =0.36 mdyn/Å for Mo(N 2 ) 3 . The Mo complexes appear to be unique in that rapid formation during co‐deposition with N 2 occurs only upon photoexcitation of the Mo 7 S – 7 P atomic resonance transition situated at 355 nm in Kr matrices. Although minor amounts of the dinitrogen complexes are formed during deposition in the absence of radiation, their concentration is not increased by thermal annealing. Each of the complexes gives rise to its own electronic absorption spectrum. Irradiation into the electronic absorption bands of individual complexes induced selective photodissociation. Photoinduced growth and decomposition studies allowed correlations to be made between the vibrational and corresponding electronic spectra.
    ISSN: 0021-9606
    E-ISSN: 1089-7690
    Source: © 1983 American Institute of Physics (AIP)〈img src=http://exlibris-pub.s3.amazonaws.com/AIP_edited.gif style="vertical-align:middle;margin-left:7px"〉
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  • 6
    Language: English
    In: The Journal of Chemical Physics, 15 December 1983, Vol.79(12), pp.5871-5886
    Description: Making use of a combination of time‐resolved emission, optical–optical double resonance, and excited state absorption spectroscopy, it has been possible to assign virtually all spectral features with energies below the z 7 P 0 state of matrix isolated Cr atoms. The a 5 S state located at 7593 cm − 1 in the free gaseous Cr atom has lifetimes of 6.32 and 5.1 s in Ar and Kr matrices, respectively. Matrix perturbations on Cr emission lines are small (〈±100 cm − 1 ). The dependence of nonradiative decay rates on the local density of states is elucidated. The magnitude of matrix shifts for a particular transition is correlated with the electronic configurations of ground and excited states and it is pointed out that states having only ‘‘ s ’’ electrons in addition to ‘‘ d ’’ electrons maintain their gas phase energy relationships in the matrix environment. Direct fluorescence is observed from the z 7 P 0 level of Mo to the 7 s ground state. The spin‐orbit splitting of the ‘‘relaxed’’ z 7 P 0 state is 690 cm − 1 , slightly lower than the 707 cm − 1 splitting of the free gaseous Mo atom.
    ISSN: 0021-9606
    E-ISSN: 1089-7690
    Source: © 1983 American Institute of Physics (AIP)〈img src=http://exlibris-pub.s3.amazonaws.com/AIP_edited.gif style="vertical-align:middle;margin-left:7px"〉
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  • 7
    Language: English
    In: Biological psychiatry, December 1983, Vol.18(12), pp.1403-9
    Description: High-affinity 3H-imipramine binding to platelets was determined in 15 drug-free unipolar depressed women and 15 normal controls. The maximum number of binding sites (Bmax) was lower in the depressed population, but the difference fell short of statistical significance (p = 0.07). The dissociation constant for imipramine binding (Kd) was found to be significantly lower among patients than in controls (p = 0.02). The various factors that can affect the in vitro platelet assay, and the implications for affective disorder research, were discussed.
    Keywords: Blood Platelets -- Metabolism ; Depressive Disorder -- Blood ; Imipramine -- Blood
    ISSN: 0006-3223
    Source: MEDLINE/PubMed (U.S. National Library of Medicine)
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  • 8
    Language: English
    In: The Journal of Chemical Physics, 01 November 1983, Vol.79(9), pp.4522-4531
    Description: The structures of the single‐phase, well‐crystallized family of hydrides Zr 3 V 3 OD x for x =0, 1.86, 2.85, and 4.93 have been refined by the Rietveld method from neutron powder diffraction data taken at 298 K. The alloy and the three deuterides studied all possess the η‐carbide structure (cubic F d 3 m ; origin at 4̄3 m ). Deuterium is found to occupy four different tetrahedral interstices preferentially. Sites with the largest number of Zr near neighbors appear to fill first unless occupation is hindered by nearby oxygen or simultaneously occupied deuterium sites. The volume expansion per number of deuterium atoms is nearly linear, even though the lowest stable hydride concentration at 298 K is near Zr 3 V 3 OD 1.5 and markedly nonlinear distortions occur within the unit cell as different sites fill.
    Keywords: Legierung ; Chemische Zusammensetzung ; Kristallstruktur ; Gitterplatz ; Neutronenbeugung ; Experimentelle Untersuchung ; Konzentrationseinfluss ; Isotopeneffekt ; Chemistry ; Physics;
    ISSN: 0021-9606
    E-ISSN: 1089-7690
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  • 9
    Language: Undetermined
    In: Die Betriebswirtschaft : DBW, 1983, Vol.43(3), pp. 407-415
    ISSN: 03427064
    Source: Deutsche Zentralbibliothek für Wirtschaftswissenschaften
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  • 10
    In: Economic Papers: A journal of applied economics and policy, October 1983, Vol.2(3), pp.1-17
    ISSN: 0812-0439
    E-ISSN: 1759-3441
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