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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Biology and fertility of soils 13 (1992), S. 242-247 
    ISSN: 1432-0789
    Keywords: Biological activity ; P availability ; Microbial biomass ; Alkaline phosphatase activity ; Dehydrogenase activity ; Soil cultivation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In Ap horizons of typical arable soils under cereals in Northwest Germany, biological activity was estimated by measuring microbial activity. Twelve soils on local farms and six soils on a research farm were analysed. Microbial biomass, dehydrogenase activity, and alkaline phosphatase activity were compared with the biological availability of P, an index describing the relationship among several P fractions that has been used in ecological agriculture. The correlation between the microbial biomass and dehydrogenase and alkaline phosphatase activity was strong but the correlation between the biological availability of P and the enzyme activities was weak. In contrast, in the farm fields, there was a significant correlation between the microbial biomass and the biological availability of P. The correlation between the biological availability of P and pH was highly significant (r=0.65–0.93***). Explanations for these correlations are discussed and proposals for further investigations are made. (1) Is the pH effect a direct chemical one or an indirect biological one? (2) Which soil organisms affect the biological availability of P in contrast to the microbial biomass, dehydrogenase activity, and alkaline phosphatase activity? (3) Is the method suitable for the investigation of all arable soils?
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 334 (1992), S. 696-700 
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and 1H-NMR Spectroscopic Investigations of New Curcumin AnalogaThe synthesis of numerous symmetric and non-symmetric curcumin(hetero) analoga (1-3) systematic variation of the conjugated chain and substituents is described. The structure of most compounds is confirmed by 1H-n.m.r.-spectroscopy. All compounds show E-configuration. Conjugation and tautomerism are discussed based on spectroscopic data.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 617 (1992), S. 89-92 
    ISSN: 0044-2313
    Keywords: 3-Diethylamino-5-phenyl-1,2,4-diselenazolium-tetrachloroniccolate(II) ; 1,2,4-diselenazolium salt ; selenaheterocyclic cation ; synthesis ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 3-Diethylamino-5-phenyl-1,2,4-diselenazolium-tetrachloroniccolate(II)  -  Synthesis and StructureBis-(N′, N′-diethyl-N-benzoylselenoureato)nickel(II) reacts with diphosgene in benzene to 3-diethylamino-5-phenyl-1,2,4-diselenazolium-tetrachloroniccolate(II). Its structure is confirmed by RKSA and ESCA. The compound consists of cations, which are planar fivemembered rings and of tetrahedral tetrachloroniccolate(II) anions. The complex is isomorphic with 3-diethylamino-5-phenyl-1,2,4-dithiazolium-tetrachloroniccolate(II).
    Notes: Bis-(N′, N′-diethyl-N-benzoylselenoureato)nickel(II) reagiert mit Diphosgen in Benzen zu 3-Diethylamino-5-phenyl-1,2,4-diselenazolium-tetrachloroniccolat(II), dessen Röntgenkristallstrukturanalyse und Röntgenphotoelektronenspektrum vorgestellt und interpretiert werden. Die Verbindung besteht aus 1,2,4-Diselenazolium-Kationen, die als planare Fünfringe vorliegen und aus tetraedrischen Tetrachloroniccolat(II)-Anionen. Sie ist zu 3-Diethylamino-5-phenyl-1,2,4-dithiazolium-tetrachloroniccolat(II) isomorph.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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