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  • 1995-1999
  • 1985-1989
  • 1975-1979  (5)
  • 1965-1969
  • 1978  (5)
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  • 1995-1999
  • 1985-1989
  • 1975-1979  (5)
  • 1965-1969
Year
  • 1
    Electronic Resource
    Electronic Resource
    Correlation of solvent effects on rates of solvolysis and SN2 reactions (1978)
    s.l. : American Chemical Society
    The @journal of organic chemistry 43 (1978), S. 1843-1854 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00404a001
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Thermodynamic properties of almandine-grossular garnet solid solutions (1978)
    Springer
    Contributions to mineralogy and petrology 67 (1978), S. 397-404 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The mixing properties of Fe3Al2Si3O12-Ca3Al2Si3O12 garnet solid solutions have been studied in the temperature range 850–1100° C. The experimental method involves measuring the composition of garnet in equilibrium with an assemblage in which the activity of the Ca3Al2Si3O12 component is fixed. Experiments on the assemblage garnet solid solution, anorthite, Al2SiO5 polymorph and quartz at known pressure and temperature fix the activity of the Ca3Al2Si3O12 component through the equilibrium: 1 $$\begin{gathered} {\text{3CaAl}}_{\text{2}} {\text{Si}}_{\text{2}} {\text{O}}_{\text{8}} \rightleftarrows {\text{Ca}}_{\text{3}} {\text{Al}}_{\text{2}} {\text{Si}}_{\text{3}} {\text{O}}_{{\text{12}}} \hfill \\ {\text{Anorthite garnet}} \hfill \\ {\text{ + 2Al}}_{\text{2}} {\text{SiO}}_{\text{5}} {\text{ + SiO}}_{\text{2}} \hfill \\ {\text{ sillimanite/kyanite quartz}}{\text{.}} \hfill \\ \end{gathered}$$ This equilibrium, with either sillimanite or kyanite as the aluminosilicate mineral, was used to control $${\text{a}}_{{\text{Ca}}_{\text{3}} {\text{Al}}_{\text{2}} {\text{Si}}_{\text{3}} {\text{O}}_{{\text{12}}} }^{{\text{gt}}} $$ . The compositions of the garnet solutions produced were determined by measurement of their unit cell edges. At 1 bar Fe3Al2Si3O12-Ca3Al2Si3O12 garnets exhibit negative deviations from ideality at the Fe-rich end of the series and positive deviations at the calcium end. With increasing pressure the activity coefficients for the Ca3Al2Si3O12 component increase because the partial molar volume of this component is greater than the molar volume of pure grossular. Previous studies indicate that the activity coefficients for the Ca3Al2Si3O12 component also increase with increasing (Mg/Mg+Fe) ratio of the garnet. The region of negative deviation from ideality implies a tendency towards formation of a stable Fe-Ca garnet component. Evidence in support of this conclusion has been found in a natural Fe-rich garnet which was found to contain two different garnet phases of distinctly different compositions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00383299
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Chloroplast migration: A new circadian rhythm inAcetabularia (1978)
    Springer
    Protoplasma 97 (1978), S. 301-310 
    Details
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Young cells ofAcetabularia mediterranea were studied by time lapse cinematography. Rhythmic changes were observed in the optical transmission of the rhizoid and the apex of the cells, respectively. Transmission changes were determined photometrically by single frame analysis. Optical density is at the maximum in the rhizoid, when it is in the minimum in the apex, andvice versa. The rhythm is endogenous, since it persists under constant conditions. The length of the periods is typically circadian. The changes of optical density are caused by chloroplast migrations which are directed towards the apex of the cell at the beginning of the circadian day and towards the rhizoid at the beginning of the circadian night. This new rhythm, which is probably circadian, is discussed in terms of cytoplasmic streaming and of other circadian rhythms, known to occur inAcetabularia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01276701
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Continuous observation of the giant primary nucleus ofAcetabularia in situ (1978)
    Springer
    Protoplasma 96 (1978), S. 89-99 
    Details
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A technique is described, which allows a continuous microscopical observation of the contents of rhizoids of livingAcetabularia cells. By this technique it was possible for the first time to study all developmental stages of the primary nucleus as well as the growth of the rhizoid. Three types of observation chambers are described, designed for dry and immersion optics and for the use with an inverted microscope.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01279578
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Redoxkinetik von Metallkomplexen in nichtwäßrigen Lösungen. 1. Mitt. Die Reduktion von [Fe(OH2)6]3+ mit Fe(II) in Nitromethan, Acetonitril und Propandiol-1,2-carbonat (1978)
    Springer
    Colloid & polymer science 256 (1978), S. 285-285 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01550578
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    Paper (German National Licenses)
    Fulltext
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