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  • 11
    Electronic Resource
    Electronic Resource
    Springer
    Plant and soil 204 (1998), S. 117-125 
    ISSN: 1573-5036
    Keywords: 15N isotope dilution method ; Rhizobium ; symbiosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Common beans usually achieve grain yields less than the genotypic potential of the cultivar under Romanian field conditions. To understand better the contribution of nitrogen fixation to the yield formation, I made a long-term evaluation (1977–1994) of inoculation effects of 19 Rhizobium leguminosarum bv. phaseoli strains on common bean cultivated in several locations. Grain yields were significantly influenced by all selected strains, years and locations in all experimental cycles, and only partially by the interactions between strains and years or strains and locations. The average yield increases induced by these strains during the four cycles ranged from 6 to 20%. Four bacterial strains proved to be more stable in their field performances, taking into account the yield increases greater than 10% over controls observed in all individual trials. Mean yields and variation limits recorded during the long-term evaluation of strain efficacy in locations with different soil pH values showed similar patterns of yield increases from soils with acidic to neutral pH values. Linear regression between mean grain yields and average temperatures demonstrated the limiting effect of temperature on yield. The interaction between bacterial strain and nitrogen fertiliser rate demonstrated the ability of dinitrogen fixation to satisfy the crop requirements for this element. An evaluation of the amounts of nitrogen fixed in three common bean cultivars inoculated with two bacterial strains showed different N2-fixing capacities among plant genotypes.
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Journal of inherited metabolic disease 17 (1994), S. 374-375 
    ISSN: 1573-2665
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 13
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 88 (1932), S. 40-44 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 14
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 13 new complex salts of the [Cr(NCS)4(p-anisidine)2]- have been synthesized and the solvation kinetics of this anion has been studied in ethanol-water mixtures. The first two NCS- ions are exchanged for water molecules. In acid solutions the rate of this reaction is not influenced by the solvent composition.In parallel with this reaction, p-anisidine molecules are substituted, too, by ethanol molecules. (Acceleration by hydrogen ions.) In the resulting complex ion the first two NCS- ions are substituted, too, by water molecules. The rate constants of this reaction are rather close to those of the reaction which leads to the exchange of the first two NCS- ions in the initial complex. The third and fourth NCS- ions are substituted only in neutral solutions by water molecules. Kinetic parameters have been derived for the substitution of the first two NCS- ions and for the substitution of the p-anisidine molecules.
    Notes: Es wurden 13 neue Komplexsalze mit den Anion [Cr(NCS)4(p-Anisidin)2]- dargestellt und die Solvatationskinetik dieses Anions in Äthanol-Wasser-Mischungen untersucht. Danach kann man die folgende Reaktionsschemata annehmen. Die ersten zwei NCS--Ionen werden gegen Wassermolekeln ausgetauscht. In sauren Lösungen wird die Geschwindigkeit dieser Reaktion nicht von der Lösungsmittelzusammensetzung beeinflußt. Parallel zu dieser Reaktion werden die p-Anisidinmolekln gegen Äthanol ausgetauscht. Diese Reaktion wird durch Wasserstoffionen beschleunigt. In den entstehenden Komplexionen sind die ersten zwei NCS--Ionen ebenfalls gegen Wasser ausgetauscht. Die Geschwindigkeitskonstanten dieser Reaktion sind von der gleichen Größenordnung wie die Geschwindigkeitskonstanten der Reaktion, die zum Austausch der ersten zwei NCS--Ionen aus dem ursprünglichen Komplexion führt. Die dritten und vierten NCS--Ionen werden nur in neutralen Lösungen gegen Wasser ausgetauscht. Kinetische Parameter für den Austausch der ersten zwei NCS--Ionen und der p-Anisidinmolekeln wurden ermittelt.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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