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  • Baltic Sea  (2)
  • Conformers in solution  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Structure of phytobenthic and associated animal communities in the Gulf of Riga (1999)
    Springer
    Hydrobiologia 393 (1999), S. 191-200 
    Details
    ISSN: 1573-5117
    Keywords: fauna ; flora ; depth distribution ; photic zone ; Baltic Sea ; SCUBA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Within the Gulf of Riga Project, phytobenthic and associated animal communities were sampled in 1995 and 1996 using SCUBA techniques. The aim was to quantitatively describe the phytobenthic communities and their distribution and to evaluate the present status of the phytobenthos in comparison to earlier investigations, as well as its contribution to the ecosystem of the Gulf as a whole. Classification and ordination analysis showed differences among the different areas of the Gulf of Riga, where Saaremaa, the Pärnu area and the middle and the inner part of the Gulf formed distinctive groups. The inner part and the Pärnu Bay area are influenced by the nutrient and pollution load of mainly the rivers Pärnu and Daugava. The intermediate western and eastern coasts of the Gulf of Riga, as well as the northern coasts along the island of Saaremaa seem to hold phytobenthic communities of comparable composition and biomass found elsewhere in clean areas of the Baltic Sea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003510105274
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  • 2
    Electronic Resource
    Electronic Resource
    Distribution of phytobenthos biomass in the Gulf of Riga (1984–1991) (1999)
    Springer
    Hydrobiologia 393 (1999), S. 181-190 
    Details
    ISSN: 1573-5117
    Keywords: phytobenthos ; Baltic Sea ; Gulf of Riga ; littoral biomass
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Floristic studies of phytobenthos in the Gulf of Riga have been carried out since the 18th century. The first quantitative data, however, are from the mid 1960's. The present paper describes distribution of phytobenthos biomass in the Gulf of Riga as could be constructed from several investigations in the late 1980's.Material from more than 260 locations was used, which was published only partly. The littoral zone of the Gulf of Riga provides a suitable habitat for a great number of different benthic communities. Forty three species of macroalgae were identified. The distribution of the different species as well as the total biomass of the communities has a strong regional pattern which relates to existing differences in ecological conditions. The material was classified according to species composition by Weighted Centroid clustering method using Simple Matching Coefficient as similarity measure. Three different groups of communities were identified and described in terms of structure and environmental factors controlling the distribution of phytobenthic communities in the area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003517427506
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  • 3
    Electronic Resource
    Electronic Resource
    Chromophore Systeme, 2. Konformation und Lichtabsorption von (2-Alkoxyvinyl)ethandionen (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 827-832 
    Details
    ISSN: 0009-2940
    Keywords: Conformations, solid state ; Conformers in solution ; UV-Vis transition energies and CO/CO dihedral angles ; CO/CO rotational barriers ; Calculations, CNDO/S-CI, MMP1, PIMM / PE spectroscopy ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Chromophoric Systems, 2. - Conformation and Absorption of Light in (2-Alkoxyvinyl)ethanedionesThe unusual color properties of yellow 1,2-bis(4,5-dihydrofuran-3-yl)ethane-1,2-dione (1) and colorless 1,2-bis(5,6-dihydro-4H-pyran-3-yl)ethane-1,2-dione (2) in the solid state and in solution are investigated by crystal structure analysis, UV-Vis, PE, and 13C-NMR spectroscopy as well as by reparameterized force-field calculations. Dione 1 takes an antiperiplaner CO/CO conformation of its chromophore in the solid state whereas dione 2 is twisted in this respect by 102°. In solution both chromophores are not planar, but 1 is less distorted (ca. 142°) than dione 2 (ca. 126°). The calculated rotational barrier for CO/CO twisting amounts to 0.9 kcal mol-1 for 1 and to 2.2 kcal mol-1 for 2.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911240424
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