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  • Articles: DFG German National Licenses  (4)
  • Eucheuma uncinatum  (2)
  • Excess molar volume  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Excess molar volumes of 1-nonanol withn-heptane at 25, 35 and 45°C1 (1992)
    Springer
    Journal of solution chemistry 21 (1992), S. 425-431 
    Details
    ISSN: 1572-8927
    Keywords: Excess molar volume ; 1-nonanol ; n-heptane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The excess molar volumes V m E at atmospheric pressure and at 25, 35 and 45°C for binary mixtures of 1-nonanol, with n-heptane have been obtained over the whole mole fraction range from densities measured with a vibrating-tube densimeter. The measurements at 25°C were extended to high dilution of 1-nonanol. The V m E are sigmoid for the three temperatures, with a small maximum at low mole fractions of the alkanol. The absolute values of V m E increase with temperature from 25 to 45°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00649696
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Excess molar volumes of diethyl carbonate with hydrocarbons or tetrachloromethane at 25°C (1995)
    Springer
    Journal of solution chemistry 24 (1995), S. 827-835 
    Details
    ISSN: 1572-8927
    Keywords: Excess molar volume ; diethyl carbonate ; n-heptane ; n-decane ; n-tetradecane ; 2,2,4-trimethylpentane ; cyclohexane ; benzene ; toluene ; tetrachloromethane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The excess molar volumes V m E at atmospheric pressure and at 25°C for binary mixtures of diethyl carbonate with n-heptane, n-decane, n-tetradecane, 2,2,4-trimethylpentane, cyclohexane, benzene, toluene, or tetrachloromethane have been obtained over the whole mole-fraction range from densities measured with a vibrating-tube densimeter. The V m E are positive for all the systems investigated, except for the mixture with toluene which is negative. The results for V m E together with data previously published on excess molar enthalpies H m E and excess molar Gibbs energies G m E , suggest interactions between carbonate and hydrocarbons which are stronger with aromatic than with aliphatic hydrocarbons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01131047
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ecological effects of seaweed harvesting in the Gulf of California and Pacific Ocean off Baja California and California (1990)
    Springer
    Hydrobiologia 204-205 (1990), S. 35-40 
    Details
    ISSN: 1573-5117
    Keywords: Eucheuma uncinatum ; harvesting ; Macrocystis pyrifera ; recruitment ; seaweed ; survivorship
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The ecological effects of harvesting were investigated for two species, the giant kelp Macrocystis pyrifera and Eucheuma uncinatum, by using harvest records and aerial surveys that show yield changes and by using studies of recruitment, survivorship and community interactions. There were no ecological effects found for M. pyrifera harvested with contemporary methods, and there are no recommendations for changing current management practices for this species. It is recommended that E. uncinatum, which on occasion produces commercially significant standing crops, not be harvested unless special precautions are taken to leave some plants for regeneration of the harvested populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00040212
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Carrageenan yield and properties of Eucheuma uncinatum (Seth. & Gard.) Daw. cultured under natural conditions (1993)
    Springer
    Hydrobiologia 260-261 (1993), S. 601-605 
    Details
    ISSN: 1573-5117
    Keywords: Eucheuma uncinatum ; carrageenan ; seaweed culture ; Gulf of California
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Eucheuma uncinatum (Setch. & Gard.) Daw. from the Gulf of California was cultured in 1001 tanks in outdoor conditions. The cultures consisted of a 3 × 3 factorial design of 10, 19 and 33 % incident light and three different conditions of nutrients during winter (0; 20 µM N03; and 20:2 µM NO3:PO4) and summer (0; 40:4; and 80:8 µM of NO3:PO4). Best growth and carrageenan yield conditions were determined under each experiment. Carrageenan extracts were analyzed for total carbohydrates, 3,6-anhydrogalactose anhydrogalactose and sulphates. Higher carrageenan yields were obtained from cultures with fertilized plants under higher light conditions from winter and summer experiments although summer cultures provided the highest yields (48%). During summer a direct relationship between nutrients and sulfate content was observed. This effect was not observed in the winter experiment. An inverse carbohydrate: light relationship was observed in winter but not in summer. Maximum values of 3,6-anhydrogalactose in winter and summer were 23.9% and 18%, respectively. Results indicate that there is the potential to increase yield and quality of Eucheuma uncinatum carrageenan cultured under natural conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00049077
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    Paper (German National Licenses)
    Fulltext
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