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  • Chemistry  (6)
  • Kumaun Himalaya  (3)
  • Flowering  (2)
  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    Epiphytic succession on tree trunks in a mixed oak-cedar forest, Kumaun Himalaya (1985)
    Springer
    Plant ecology 63 (1985), S. 105-112 
    Details
    ISSN: 1573-5052
    Keywords: Bryophyte ; Diversity ; Epiphytic succession ; Evolutionary strategy ; Kumaun Himalaya
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The epiphytes present at about breast height on trunks of different size were studied for three major tree species in a seasonally wet forest at 2050 m altitude in the Kumaun Himalaya: Cedrus deodora, Quercus floribunda and Q. leucotrichophora. The total biomass and species number per unit trunk area, were found to increase with trunk size. It was supposed that the results indicated a succession in the type of epiphytic cover from young trunks to older trunks. The amount of loose material (plant remains and ‘soil’) per unit area of trunk increased with increasing girth. The C:N ratio in this material was initially very high on the oaks (129–197) and declined with increasing trunk size (to 73–78); the ratio was constant across girth classes in the cedar (86–87). Bryophytes produced most biomass on most trunks; next to them were lichens on the smallest trunks, and flowering plants on the largest. The number of species of epiphytes was similar on all three host species. The results are discussed in relation to contemporary ideas on diversity and ‘strategies’.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00044060
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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Compositional and structural features of certain tree stands along an elevational gradient in Central Himalaya (1989)
    Springer
    Plant ecology 85 (1989), S. 117-120 
    Details
    ISSN: 1573-5052
    Keywords: Himalayan forest ; Kumaun Himalaya ; Ordination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Forests of an elevational transect in the central Himalayan region were studied regarding their tree species composition and structural features. In spite of many differences in compositional and structural features in different forest stands, the arrangement of stands in the ordinations based separately on species composition and structural features exhibit many similarities. Disturbances such as landslides and forest fires play the most important role in the distributor of particular species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00042261
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  • 5
    Electronic Resource
    Electronic Resource
    Electron impact mass spectra of 1-methyl-3-(2-benzothiazolylhydrazono)-2-indolinones (1992)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 27 (1992), S. 17-18 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A study of the fragmentation of l-methyl-3-(2-benzothiazolylhydrazono)-2-indolinones on electron impact reveals that the major processes involve N—N bond fission and the competing loss of CO from the molecular ion.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210270105
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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    The accidental equivalence of protons in 3-hydroxy-3-methylbutyrolactone: Solvent and temperature dependence (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 721-723 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The temperature or the nature of the solvent selectively affects the NMR equivalence of the protons at C-2 and C-4 in 1.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270030611
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  • 8
    Electronic Resource
    Electronic Resource
    Mass spectra of some 1-substituted-4-acetoacetyl-3-methylpyrazol-5-ols (1988)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 23 (1988), S. 140-144 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The fragmentation of 1-phenyl-, l-(2′-pyridyl)- and 1-(4′-methyl-2′-quinolyl)-4-acetoacetyI-3-methyIpyrazol-5-ols (compounds 1, 2 and 3, respectively) on electron impact has been studied and the major processes interpreted. The common feature in the mass spectra of these compounds is the loss of ketene, acetonyl radical, acetone and two molecules of ketene from the molecular ion. Whereas the ion generated after the last process, which corresponds to 1-substituted-3-methyIpyrazol-5-ols, loses methyl cyanide in the case of 1, similar ions in the case of 2 and 3 lose Ċ2HO moiety, necessitating an intramolecular hydrogen transfer followed by ring fission and subsequent loss of methyl cyanide. All these and other related processes have been substantiated with the help of accurate mass measurements of the fragment ions and B/E linked-scan spectra.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210230213
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  • 9
    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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  • 10
    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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