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  • 1
    Monograph available for loan
    Monograph available for loan
    Leningrad : Gidrometeorolog. Izd.
    Call number: MOP 33767
    Type of Medium: Monograph available for loan
    Pages: 663 S.
    Language: Russian
    Note: In kyrill. Schr., russ.
    Location: MOP - must be ordered
    Branch Library: GFZ Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    Prague : Academia
    Call number: G 7506 ; G 7939
    Type of Medium: Monograph available for loan
    Pages: 76, [164] S. ; Ill.
    Location: Upper compact magazine
    Location: Upper compact magazine
    Branch Library: GFZ Library
    Branch Library: GFZ Library
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  • 3
    Series available for loan
    Series available for loan
    Hannover : Schweizerbart
    Associated volumes
    Call number: SR 99.0054(13)
    In: Geologisches Jahrbuch
    Type of Medium: Series available for loan
    Pages: 228 S. + 1 Beil.
    Series Statement: Geologisches Jahrbuch : Reihe B 13
    Language: German
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Biochemistry 15 (1976), S. 4222-4227 
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 11 (1978), S. 671-671 
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 110 (1979), S. 813-822 
    ISSN: 1434-4475
    Keywords: Absorption spectra, calculation ; Hydrated ions ; MESQUAC-MO-SCF ; MO-Calculation ; Transition metals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract MESQUAC (Mixed ElectroStatic QUAntum Chemical) calculations have been performed for the aquocomplex of the Ti(III) ion. First, second and third hydration spheres have been taken into account, leading to excellent agreement with the experimental solvation energy of this ion in water. The calculations indicate, that two hydration spheres are bound tightly to the ion, whereas for the third sphere no more strong ordering should be expected. Methodical details as the choice of fractional point charges and the number of ligands included in the full quantum chemical description have been varied to test the method's reliability for calculations on transition metal complexes. Besides thermodynamic quantities also the absorption spectrum of aqueous Ti(III)-solutions has been taken as a basis for testing the results of the calculations. By a slight extension of the original MESQUAC concept also spectroscopic properties are obtained rather satisfactorily. Exponents of optimized smallGaussian basis sets for the transition metals Ti to Zn are given, which seem to be suitable for the use in such calculations.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 109 (1978), S. 871-881 
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Der Einfluß von Methyl- und Ethyl-Substitution am Stickstoff der Peptidbindung auf die Wechselwirkung mit Alkali- und Erdalkali-Metallionen wurde mittels quantenchemischer Berechnungen an Komplexen mit Lithium, Natrium und Beryllium mit verschieden substituierten Amiden, und mittels der Differenz-Energie-Flächen vonab initio Berechnungen mit minimalemGauß-Basis-Set, studiert. Es wurden charakteristische ionenspezifische Differenzen in den Wechselwirkungen-entsprechend den verschiedenen Substituenten gefunden, die das Potential der Metallionen im Feld der Peptidbindungsgruppe sehr stark beeinflussen. Es werden Bindungsenergien und Elektronendichten in den Komplexen, bezogen auf neuere experimentelle Daten der Metall-NMR-Spektroskopie, diskutiert. Die Ergebnisse der Berechnungen zeigen mögliche Wege auf, die Ionenspezifität und die Reaktivität von Peptid- und Protein-Metall-Bindungszentren in biologischen Systemen zu beeinflussen.
    Notes: Abstract The influence of methyl- and ethylsubstitution at the nitrogen atom of peptide groups on their interaction with alkali and alkaline earth metal ions has been studied by means of quantum chemical calculations on the complexes of lithium, sodium and beryllium with the different substituted amides, and by means of difference energy surfaces obtained fromab initio calculations employing minimalGaussian basis sets. Characteristic ion specific differences are found to occur in the interaction according to the respective substitutions, which will influence the potential for the metal ion in the field of the peptide groups quite strongly. Binding energies and electron density distribution in the complexes are discussed with respect to recent experimental data obtained by metal nmr spectroscopy. The results of the calculations give some indications to possible ways of influencing the ion specifity and reactivity of peptide and protein metal binding sites in biological systems.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 108 (1977), S. 1153-1162 
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The solvating properties of formamide, N-methylformamide, dimethylformamide, N-ethylformamide and diethylformamide have been investigated by means of vapour pressure and conductivity measurements. For the salts and ions, resp. average solvation numbers have been calculated from vapour pressure data and limiting ionic conductances. The solvation numbers are used for a discussion of the influence of N-substituents on the solvating properties of the amides.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 108 (1977), S. 265-270 
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The interaction of a series of cations with dimethylformamide is investigated using IR spectroscopy. The complexation of a cation by the amide is shown to weaken the C=O bond and to enforce both C−N and C−H bonds of the ligand. These results are in agreement withCNDO/2 calculations on force constants and vibration frequencies. The IR results, which can reflect only qualitative trends concerning the changes of the bonding situation in the ligand molecule upon metal ion complexation, are compared with the more accurate data obtained in recent NMR line shape investigations.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 108 (1977), S. 703-712 
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Three different, mixed electrostatic-quantum chemical models for the description of metal-amide complexes have been tested. Two of them contain an electrostatic approximation for the metal ion, the third intends to give a better approximation to the liquid phase, i.e. the solution, by means of an electrostatic concept taking into account further ligand molecules, but maintaining the quantum chemical treatment of the metal. The results of the calculations are discussed in connection with experimental data. The applicability of the models within certain limitations confirm the conclusion, that electrostatic and polarization effects represent the dominant interaction terms between ions and amide ligands, as assumed already on the basis of experimental data. The electrostatic-quantum chemical models allow an extension of the theoretical treatment of complexes to metal ions of higher atom number, and a remarkable improvement of the absolute values for stabilization energies and rotational barriers without significant increase in computing time.
    Type of Medium: Electronic Resource
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