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  • 1
    Electronic Resource
    Electronic Resource
    Hydrogen bond dynamics in isotopically substituted benzoic acid dimers (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 1502-1520 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The hydrogen pair transfer in the hydrogen-bonded dimers of benzoic acid and its carboxyl-deuterated species is investigated in the solid. Measurements are reported for the temperature-dependent NMR relaxation time T1 in single crystals containing dimers with one or two carboxylic deuterons. Combined with previous data, the temperature dependence of the measurements is analyzed in terms of a master-equation description for a one- or two-dimensional quantum-mechanical model of the transfer motion. The description by a one-dimensional model is found to be inadequate as it yields unrealistic isotope effects in the model parameters. On the other hand, reasonable results are obtained for a two-dimensional model which includes, apart from the transfer motion of the hydrogens, a heavy atom mode with properties suggested by x-ray structural data. This model explains the thermal activation of the transfer process mainly as a result of promotion of tunneling by heavy atom rocking. Activation energies remain considerably smaller than the barrier height and indicate predominance of tunneling even at room temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459129
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  • 2
    Electronic Resource
    Electronic Resource
    Dynamics of hydrogen bonds in carboxylic acids
    Amsterdam : Elsevier
    Physica B+C 136 (1986), S. 161-164 
    Details
    ISSN: 0378-4363
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0378-4363(86)90398-0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    TOXAEMIA OF PREGNANCY (1961)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 68 (1961), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1961.tb02843.x
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  • 4
    Electronic Resource
    Electronic Resource
    Der Wandel in der Indikationsstellung seit Einführung des Vakuum-Extraktors, Erfahrungen bei 600 Fällen (1963)
    Springer
    Archives of gynecology and obstetrics 198 (1963), S. 546-548 
    Details
    ISSN: 1432-0711
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00674233
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Über die Verwendung von Myzelsuspensionen als Impfmaterial in Wachstumsversuchen mit Pilzen (1951)
    Springer
    Cellular and molecular life sciences 7 (1951), S. 237-239 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In investigations on fungi incapable of producing spores, conidia, or oidia under laboratory conditions the liquid media used for growth experiments are, according to the ordinary technique, inoculated with mycelium bits cut from colonies of the fungi grown on solid agar media in tubes or Petri dishes. The difficulties and disadvantages met with in employing this method are discussed. A new method is described using mycelial suspensions for inoculation of liquid substrates. The suspensions are prepared by shaking bits of mycelial mats with glass beads, about 6 mm in diameter, and distilled water or “physiological” salt solution under sterile conditions. The large mycelial particles are allowed to settle. The supernatant suspension is pipetted into a sterile flask and diluted to the propervolume. The suspended particles may be washed by sedimenting in a centrifuge, resuspending in distilled water or salt solution, and recentrifuging under sterile conditions. Of course the method may be modified in different ways. The new method is now used on a routine scale in this institute in investigations on mycorrhiza-forming and litter-decomposing fungi.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02139012
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  • 6
    Electronic Resource
    Electronic Resource
    Mehrdimensionale Papierchromatographie (1954)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 37 (1954), S. 1581-1585 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird ein neues mehrdimensionales Papierchromatographie-Verfahren beschrieben. Dabei wird vorerst eindimensional vorgetrennt, hierauf werden die noch ungenügend separierten Komponenten gruppenweise auf neue Blätter übertragen und mit spezifischen Lösungsmitteln weiter getrennt. Die Übertragung erfolgt durch Ausschneiden und Aufnähen der betreffenden Chromatogramm-Streifenstücke. Das Verfahren bietet grosse Vorteile: Unter anderem sehr guter Trenneffekt, auch bei komponentenreichen Gemischen; es erfordert nur kleine Gefässe; bei jedem Laufe können Testsubstanzen mitchromatographiert werden. An einem Beispiel wird die Trennung eines Gemisches von 22 Aminosäuren nach der neuen Technik dargelegt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19540370602
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    Paper (German National Licenses)
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