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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of aquatic ecosystem stress and recovery 2 (1973), S. 277-286 
    ISSN: 1573-5141
    Keywords: ecology ; objectives ; water management ; Amoeba-approach
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Dutch integral water management aims to restore and maintain healthy aquatic ecosystems, which can sustain most human uses. Clear ecological objectives are necessary. Sustainability of fundamental ecological values (production and yield, species diversity, and self-regulation) is assumed to be best preserved in the reference situation. This is the situation, in which human influence is minimal. A general method to present ecological information, the Amoeba approach is discussed. This approach uses selected species as representatives for the ecosystem. Criteria for the selection of species are discussed. For each species (target variable) the current situation, the reference situation, and estimated effects of measures can be found and plotted in an amoeba-like figure. The presentation is a simplification and is therefore easily understood by managers, politicians, and the public. It's application for some Dutch inland waters is discussed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of aquatic ecosystem stress and recovery 2 (1993), S. 277-286 
    ISSN: 1573-5141
    Keywords: ecology ; objectives ; water management ; Amoeba-approach
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Dutch integral water management aims to restore and maintain healthy aquatic ecosystems, which can sustain most human uses. Clear ecological objectives are necessary. Sustainability of fundamental ecological values (production and yield, species diversity, and self-regulation) is assumed to be best preserved in the reference situation. This is the situation, in which human influence is minimal. A general method to present ecological information, the Amoeba approach is discussed. This approach uses selected species as representatives for the ecosystem. Criteria for the selection of species are discussed. For each species (target variable) the current situation, the reference situation, and estimated effects of measures can be found and plotted in an amoeba-like figure. The presentation is a simplification and is therefore easily understood by managers, politicians, and the public. It's application for some Dutch inland waters is discussed.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Zwei Verfahren zur Darstellung α-trimethylsubstituierter Methylphosphane von genereller Anwendungsbreite werden vorgestellt. Phenylierte Vertreter PhPR—CH2—Tms (2a - ) lassen sich durch Na-Spaltung in NH3 und nachfolgende Kondensation mit Cl—CH2—Tms gewinnen. Metallierung mit n-BuLi und TmsCl—Einwirkung führt zur Zweitsilylierung in αPosition (3a - d, f. Diorganylamino-funktionelle Derivate 5a - e und 6 sind vorteilhaft über eine Primäraktivierung (Grignardierung oder Lithiierung) der Silylmethan-Komponenten zu erhalten. Die oxidative Ylidierung mit CCl4 ergibt nach Gl. (7) in allen Fällen P-Chlor-methylphosphorane. Außer durch Elementaranalyse wird die Konstitution sämtlicher Verbindungen durch die 31P{1H}- und komplementären 13C{1H}-Daten gesichert.Phosphorus-Carbon-Halogen Compounds. XXV. α-Trimethylsilyl-substituted Methylphosphanes: Synthesis and CCl4—Oxidation to P-Chlor-methylene-phosphoranesTwo procedures of general applicability for the synthesis of αxyltrimethylsilyl-substituted methylphosphanes are reported. Phenylated species PhPR—CH2—Tms (2a - e) can be obtained by Na cleavage in NH3 and subsequent condensation with Cl—CH2—Tms. Metallation with n-BuLi and treatment with TmsCl causes two-fold silylation in α-position (3a - d, f). Diorganylamino-functionalized derivatives 5a - e and 6 are preferrably prepared by initial activation (grignardation or lithiation) of the silylmethane component. Oxidative ylidation with CCl4 yields in all cases P-chloro-methylenephosphoranes according to eq. (7). The constitution of all compounds has been confirmed by 31P{1H} and complementary 13C{1H} data in addition to elemental analyses.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 22 (1889), S. 3006-3011 
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 23 (1890), S. 1228-1242 
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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