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  • Organic Chemistry  (3)
  • Flowering  (2)
  • Leafdrop  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Phenological characteristics of the tree layer of Kumaun Himalayan forests (1985)
    Springer
    Plant ecology 60 (1985), S. 91-101 
    Details
    ISSN: 1573-5052
    Keywords: Flowering ; Forest ; Fruiting ; Kumaun Himalaya ; Leafdrop ; Leaf flushing ; Phenology ; Phenological activity level ; Treelayer phenology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The phenology of tree components of natural forests occurring between 350 and 2150 m in Kumaun Himalaya is descibed. All forests had more evergreen than deciduous taxa. The degree of evergreenness increased with increasing elevation and decreasing summer dryness. For most species (including all dominants) concentrated leafdrop and simultaneous leafing occurred during the warm-dry period of the year. About half of the species showed multiple leafing. All species had a sharp flowering peak in April. Wet-season flowering was rare. Most of the species flowered synchronously. In the sal- (Shorea robusta) and pine (Pinus roxburghii) forests a single peak of fruit maturation occurred in summer, while in other forests there also was a secondary peak in autumn.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00040351
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Certain phenological characters of the shrub layer of Kumaun Himalayan forests (1985)
    Springer
    Plant ecology 63 (1985), S. 113-119 
    Details
    ISSN: 1573-5052
    Keywords: Flowering ; Fruiting ; Leafdrop ; Leaf flushing ; Kumaun Himalayan forest ; Phenology ; Shrub layer phenology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The phenology of 49 shrub species in five forest types occurring along an altitudinal gradient (350–2150 m) in Kumaun Himalaya has been studied. The evergreen leaf-exchanging taxa accounted for nearly half of the species, the remaining half was nearly equally divided between an evergreen continual leaf drop type and deciduous taxa. The percentage of species with lengthy leaf drop increased with elevation and finally leveled off. At each site the maximum leaf drop period coincided with the warm dry period. Percentage of species with multiple leaf flushing was low for all forests. The degree of extended leafing decreased with increasing elevation along which summer dryness also decreased. Earliest leaf initiation was observed for evergreen continual leaf drop species, followed by evergreen leaf-exchanging, and deciduous types. For each forest, two peaks of flowering activity occurred, one during the warm dry period and the other in the warm wet period. The percentage of species with multiple flowering increased with increasing elevation. Nearly half of the species bore fleshy fruits. The mature fruit retention period for different forests ranged from about 2–3 months. The proportion of deciduous species was similar in trees and shrubs; leaf drop was common during the summer season for trees, while it was common during the winter season for shrubs; the proportion of species with multiple leafings was greater and leaf initiation earlier in shrubs than trees; and generally shrubs showed two flowering peaks and trees only one.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00044061
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Formation Constants of Mixed Ligand Complexes Involving Ligands of Biological Importance. pH-metric studies of aqueous solution equilibria between Ni(II)/Zn(II)/Cd(II), histidine, and α-alanine/phenylalanine (1978)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 320 (1978), S. 324-328 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Untersuchungen über Gemischt-Liganden-Komplexe, einschließlich biologisch interessanter Liganden Ni(II), Zn(II) oder Cd(II)-Histidine-α-Alanine/Phenylalanine
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19783200221
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    pH-Metric Studies on the interaction of oxovanadium (IV) with iminodiacetic (IMDA) and nitrilotriacetic (NTA) acids (1973)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 315 (1973), S. 23-30 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Solution equilibrium studies on the interaction of oxovanadium (IV) with iminodiacetic (IMDA) and nitrilotriacetic (NTA) acids have been carried out. pH-Titrations of the reaction mixtures containing vanadyl sulphate and aminopolycarboxylic acid in equimolar ratio have shown the formation of 1:1 chelates. With IMDA, the possibility of 1:2 chelate (metal ion: IMDA) is also indicated. The equilibrium, chelate formation, hydrolysis and polymerization constants have been calculated at 25 and 30°C and also the thermodynamic functions viz. ΔH, ΔF, and ΔS.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19733150104
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  • 5
    Electronic Resource
    Electronic Resource
    The Migratory Aptitude of the Ethoxycarbonyl Group in the Pinacol Rearrangement. Preliminary communication (1972)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 55 (1972), S. 2252-2254 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The migratory aptitude of the ethoxycarbonyl group in the pinacol rearrangement was deduced from the structure of the products observed after treatment of 2-substituted 2,3-dihydroxy-3-phenylbutyrates with fluorosulfonic acid at 0° for 3 minutes. The migratory aptitude of ethoxycarbonyl is comparable to that of ethyl, greater than that of methyl or hydrogen, but smaller than that of phenyl. Cyclization and fragmentation reactions were also observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19720550648
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    Paper (German National Licenses)
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