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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and spectroelectrochemical properties of pentaammineruthenium(II) complexes of quinone diimines (1975)
    s.l. : American Chemical Society
    Inorganic chemistry 14 (1975), S. 1902-1907 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic50150a034
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  • 2
    Electronic Resource
    Electronic Resource
    Initiation of Plant Root-Microbe Interactions (1979)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Microbiology 33 (1979), S. 355-376 
    Details
    ISSN: 0066-4227
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.mi.33.100179.002035
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  • 3
    Electronic Resource
    Electronic Resource
    The influence of ionic radii of cations and covalent forces on the unit cell dimensions of spinels (1959)
    Springer
    Contributions to mineralogy and petrology 6 (1959), S. 219-232 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Fe-, Cr- and Al-spinels were synthesized and their unit cell sizes determined by means of X-rays. Differential thermal curves show that the magnetic inversion of α Fe2O3 at 680° C accelerates the formation of the ferrites when the constituent oxides are heated together. A correlation can be made between ionic radii of cations and unit cell dimensions provided the effect of covalent forces in the lattice is taken into account. The values for ionic radii of cations as given byAhrens (1952) permit a better correlation than those ofGoldschmidt. A shrinkage of 0.01 Å in the unit cell size per 0.01 Å decrease in the ionic radius of the divalent cations was determined when spinels with the same cation arrangement in the same group were compared. A shrinkage of 0.027 Å in the unit cell size per 0.01 Å decrease in the ionic radius of the trivalent cations was determined in spinels having the same divalent cation and cation arrangement when the trivalent cations form the same type of bonds. The “half-occupation” of the 3d orbits in Mn2+ and Fe3+ causes abnormally high unit cell dimensions in spinels where these ions are incorporated in octahedral sites. This is attributed to the formation of electrovalent bonds by these ions. Variable forces of contraction in the lattice are revealed when the unit cell dimensions are correlated with the ionic radii of cations. The force of contraction can be satisfactorily explained as being due to covalent forces in the spinel structure. The magnitude of this force or the degree of covalence in the bonds increases in the following order of cations where these are situated in tetrahedral sites: The divalent transition element ions, Fe2+, Co2+ and Ni2+; the B-Sub-group element ions Cd2+ and Zn2+; Fe3+ in tetrahedral co-ordination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01130325
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  • 4
    Electronic Resource
    Electronic Resource
    β-nitropropionic acid and nitrite in relation to nitrate formation by Aspergillus flavus (1964)
    Springer
    Archives of microbiology 49 (1964), S. 167-175 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary β-nitropropionic acid (BNP) was converted to nitrate in media inoculated with A. flavus spores or with replacement cultures of mycelium pregrown in glucose-peptone medium. Conversion by replacement cultures was rapid: 8–30% in 2 days; influenced by pH: most rapid at pH 3.5; and extensive: as much as 80% BNP nitrogen appeared as nitrate after 14 days. Nitrite was detectable in BNP replacement cultures at low levels or not at all, and nitrate was formed in BNP replacement media with or without glucose. Nitrite was not oxidized in growing cultures inoculated with spores, but replacement cultures oxidized over 50% of added nitrite to nitrate in 8 days. No nitrite or nitrate appeared in replacement systems with pyruvic oxime, oxalacetic acid oxime, acetoxime, ketoglutaric acid oxime, or hydroxylamine. Of the three non-nitrifying mutants of A. flavus obtained, all formed nitrate from BNP in replacement but only one oxidized nitrite to nitrate. No accumulation of free or bound hydroxylamine or of nitrite could be detected in the mutants. BNP was detected by qualitative test in cultures of the wild type but not the mutants. Evidence indicates that the pathway in A. flavus is BNP→NO3 - rather than BNP→NO2 -→NO3 -.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00422140
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  • 5
    Electronic Resource
    Electronic Resource
    Besprechungen (1959)
    Springer
    Naturwissenschaften 46 (1959), S. 387-388 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00638833
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  • 6
    Electronic Resource
    Electronic Resource
    Bestimmung von metallischem Eisen in Gegenwart seiner Oxide (1964)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 204 (1964), S. 107-110 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A new method for the determination of metallic iron in the presence of its oxides is proposed. It is based on selective oxidation of metallic iron to FeII by lead chloride. In comparison with known methods this procedure offers the advantage of being simple and rapid. FeIII formed during the separation of FeII solution from unattacked iron oxides is easy to reduce because lead chloride does not interfere. The method can be recommended for the determination of metallic iron in “sponge iron” in an industrial laboratory.
    Notes: Zusammenfassung Es wurde ein neues Verfahren zur Bestimmung von metallischem Eisen in Gegenwart seiner Oxide ausgearbeitet, das auf der selektiven Oxydation des Eisens zu Eisen(II) durch Bleichlorid beruht. Es hat den Vorteil gegenüber den bekannten Methoden, das es leicht und rasch durchzuführen ist. Das bei der Trennung der zu titrierenden Eisen(II) -lösung von den nichtangegriffenen Oxiden gebildete FeIII läßt sich im Gegensatz zu anderen Verfahren leicht reduzieren, da das Bleisalz nicht stört. Die Methode kann für die Eisenmetallbestimmung im „schwammigen Eisen“ in den Kontrollaboratorien der Industrie empfohlen werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00511716
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  • 7
    Electronic Resource
    Electronic Resource
    On a problem of M. H. Stone (1957)
    Springer
    Acta mathematica hungarica 8 (1957), S. 455-460 
    Details
    ISSN: 1588-2632
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02020328
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  • 8
    Electronic Resource
    Electronic Resource
    Über die Anordnung von Ringen (1957)
    Springer
    Acta mathematica hungarica 8 (1957), S. 259-260 
    Details
    ISSN: 1588-2632
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02025248
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  • 9
    Electronic Resource
    Electronic Resource
    Ideals and congruence relations in lattices (1958)
    Springer
    Acta mathematica hungarica 9 (1958), S. 137-175 
    Details
    ISSN: 1588-2632
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02023870
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  • 10
    Electronic Resource
    Electronic Resource
    Polymere 3-Acryloyloxyalkyl- und 3-Acryloyloxyaryl-4-thiazolidon als Strahlenschutzsubstan zen (1979)
    Springer
    Colloid & polymer science 257 (1979), S. 448-448 
    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/BF01521612
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