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  • 1
    Electronic Resource
    Electronic Resource
    The fate of clover-derived nitrogen (15N) during decomposition under field conditions: Effects of soil type (1988)
    Springer
    Plant and soil 105 (1988), S. 141-147 
    Details
    ISSN: 1573-5036
    Keywords: barley ; decomposition ; green manure ; N-budget ; N-release ; N-15 ; soil type ; subterranean clover
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Seven soils were collected from different field sites in Southern Finland and placed into microplots confined in PVC-cylinders (30 cm i.d. × 50 cm). Subterranean clover material labelled with15N, contained in mesh bags, was buried into the microplots in October, and the plots were sown with barley the following May. The mesh bags were removed and soil samples taken immediately after the barley harvest. The crop, mesh bags and soil were then analysed for15N content. The soil type affected release of clover N from the mesh bags and its retention in soil only slightly; at the end of the experiment the mesh bags contained 30–38% and the soil (0–45 cm) 28–37% of the clover N input. The uptake of clover N by the barley crop varied from 11 to 20% and correlated best with the soil electrical conductivity (r=0.820*). The total recovery of clover-derived N varied from 72 to 92%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02371152
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The fate of clover-derived nitrogen (15N) during decomposition under field conditions: Effects of liming and fertilization (1988)
    Springer
    Plant and soil 111 (1988), S. 121-126 
    Details
    ISSN: 1573-5036
    Keywords: barley ; decomposition ; fertilization ; green manure ; liming ; N-budget ; N-release ; 15N ; red clover
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Red clover material labelled with15N was confined in mesh bags and buried into microplots in October at two field sites in Sourthern Finland. The soils (Kettula silt loam and Långvik loam) contained in the microplots were previously limed and fertilized with PK (N was given in next May) in different combinations. The following May the microplots were sown with barley and after the barley had been harvested (that August) soil samples and the mesh bags were removed. The crop, mesh bags and soil were then analysed for15N content. The soil treatments did not affect the release of clover N from the mesh bags and only slightly its retention in Kettula silt loam. The dry mass of barley obtained responded strongly to the different soil treatments. In comparison, the uptake of clover N by the barley varied much less; in Kettula silt loam a 1.6 fold increase in barley dry mass did not affect its content of clover N (12–13% of input) and in Långvik loam a ten fold increase in barley dry mass yield corresponded to a three fold increase of the content of clover N (5–16%). The total recovery of clover N (clover N in soil+mesh bags+barley harvest) was almost independent of the soil treatment; in Kettula silt loam and Långvik loam being respectively 52–56% and 71–85% of the input.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182045
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Concave Reagents, 4 Protonation of Nitronate Anions via concave Pyridines. Stereoselective C-Protonation versus Nef Reaction (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 221-223 
    Details
    ISSN: 0009-2940
    Keywords: Bases, concave / Protonation, regioselective / Nef reaction / aci-Nitro compounds ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The intramolecular competition for C- or O-protonation of the nitronate anion 5a is determined by sterical factors and by the [EtOH⊕2] concentration. The product of the Nef reaction 6 is formed in buffered, non-acidic media when the proton donors are sterically hindered.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230137
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  • 4
    Electronic Resource
    Electronic Resource
    Concave Reagents, 5 Bimacrocyclic 1,10-Phenanthroline Cyclophanes (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 643-645 
    Details
    ISSN: 0009-2940
    Keywords: Concave base / Macrocycle / 1,10-Phenanthroline / Cyclophane / Aryl lithium compounds ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The addition of lithium aryls 3 to 1,10-phenanthroline (2), functionalization of the rearomatized bisadduct 8b to the tetraphenol 8d, and cyclization of 8d with two equivalents of an α,ω-ditosylate 9 led to a highly symmetrical, conformer-free bimacrocyclic 1,10-phenanthroline 10a in which the basic and coordinating region possesses a concave shielding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230335
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Anwendung der Isonitril-Nitril-Umlagerung zur Synthese von 2,2,5,5-Tetramethylcyclopentancarbonsäure, einem Baustein für Süßstoffe auf Aminosäurebasis (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 2555-2556 
    Details
    ISSN: 0009-2940
    Keywords: Isocyanide ; Rearrangement ; Sweetener ; Cycloalkanecarboxylic Acid ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Use of the Isonitrile-Nitrile Rearrangement for the Synthesis of 2,2,5,5-Tetramethylcyclopentanecarboxylic Acid, a Building Block for Sweeteners on the Basis of Amino Acids1)2,2,5,5-Tetramethylcyclopentanecarboxylic acid (7) was synthesized in four steps from 2,2,5,5-tetramethylcyclopentanone (3). The key step of the reaction is the gas-phase rearrangement of 2,2,5,5-tetramethylcyclopentyl isocyanide (5) to 2,2,5,5-tetra-methylcyclopentanecarbonitrile (6), which is hydrolyzed to 7.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911241126
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    Paper (German National Licenses)
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