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  • Tropical rain forest  (2)
  • 1 H-NMR  (1)
  • Springer  (3)
  • Blackwell Publishing Ltd
  • Springer Nature
  • 1985-1989  (3)
Collection
Keywords
Publisher
  • Springer  (3)
  • Blackwell Publishing Ltd
  • Springer Nature
Years
  • 1985-1989  (3)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Ecological research 2 (1987), S. 215-227 
    ISSN: 1440-1703
    Keywords: Buttress ; Production structure ; Stem ; Tree form ; Tropical rain forest
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The form of tropical trees was studied with reference to the production structure of the component individuals of a tropical rain forest stand in Sebulu, East Kalimantan in Indonesian Borneo, since the production structure as a physical or bio-economical basis of tree form still remains obscure in tropical rain forests. The pipe model theory successfully explained the crown shapes of different trees, and its parameter, designated as specific pipe length, suggested an increase in the cost of leaf mass growth with an increase in crown size. A mathematical model consisting of exponential functions of aboveground height was applied for describing stem form, and its properties were examined through changes in its coefficients and by adopting an assumption of the geometrical similarity of individual stem form as a criterion for comparing differences in stem form among individual trees. Furthermore, the cost of buttersses was discussed using the relation between bole- and buttress weight calculated from the mathematical model.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Plant ecology 68 (1986), S. 71-82 
    ISSN: 1573-5052
    Keywords: Biomass ; Building phase ; Dipterocarp forest ; Gap ; Indonesia ; Kalimantan ; Mature phase ; Tropical rain forest
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Aboveground plant biomass was examined in a tall virgin tropical lowland evergreen rain forest dominated by Dipterocarpaceae in Sebulu, East Kalimantan, Indonesia, with special reference to the gap-, building- and mature phases of the forest growth cycle. From the records of dimensions of sample trees examined by the stratified clip technique and DBH inventory data of trees in a study plot, the biomass of larger trees (DBH ≥4.5 cm) was estimated by the allometric correlation method. The biomass of smaller plants (DBH 〈 4.5 cm) was estimated by harvesting the plants in small quadrat plots. Although large differences were found between aboveground-biomass-estimates in different patches of different growth stages, the aboveground biomass in a 1.0 ha plot was 509 t/ha, and the one-sided LAI was 7.3 ha/ha. These values seem to result from the tall forest architecture with huge emergent trees (over 70 m high) and a moderate packing of plant mass indicated by the basal area value of 38.8 m2/ha for trees with DBH ≥4.5 cm.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-4986
    Keywords: cerebroside ; synthesis ; 1 H-NMR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The cerebrosides were first isolated by Thudicum in 1874 and the structures were established by Carteret al. in 1950 (for review, see [2]). In 1961 Shapiro and Flowers [3] reported the first total synthesis of a cerebroside1 (Fig. 1) which was identified with the natural sample, only through comparison of their i.r. data. In order to confirm the absolute configuration at C-2′ of natural cerebroside1, we describe here an unambiguous synthesis of two stereoisomeric cerebrosides1 and2, and found that the1H-NMR spectra of the synthetic1 (Fig. 2) was completely identical with that of the natural cerebroside reported recently by Dabrowskiet al. [4]. In planning the synthetic route, the target structures1 and2 were disconnected at the dotted lines to give three key synthetic intermediates3, 4 and5 or6 (Fig. 1).
    Type of Medium: Electronic Resource
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