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  • 1
    Electronic Resource
    Electronic Resource
    Defensive strategy of twoHypselodoris nudibranchs from Italian and Spanish coasts (1991)
    Springer
    Journal of chemical ecology 17 (1991), S. 625-636 
    Details
    ISSN: 1573-1561
    Keywords: Opisthobranch ; nudibranch ; Hypselodoris webbi ; Hypselodoris ; villafranca ; sponge ; Dysidea fragilis ; chemical defense ; longifolin ; nakafuran-9 ; isotavacfuran
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Hypselodoris nudibranchs from different geographic areas (Spain and Italy) have been studied in order to investigate their general defensive strategy. Longifolin (1) and nakafuran-9 (2) are the main ichthyodeterrent allomones used by the mollusks to avoid predation. Evidence of their dietary origin is presented and the very effective strategy against predators, which includes secretion of allomones into the mucus and their storage into specific mantle dermal formations (MDFs), is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00982131
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Time-temperature responses of tomato cells during high- and low-temperature inactivation (1991)
    Springer
    Planta 185 (1991), S. 576-582 
    Details
    ISSN: 1432-2048
    Keywords: Calorimetry ; Cell culture (temperature responses) ; Lysopersicon (temperature responses) ; Temperature response and stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Precise time and temperature dependences of the decrease of metabolism of cultured cells of tomato (Lysopersicon esculentum (L.) Mill. L. peruvianum (L.) Mill.) resulting from exposures to high and low temperatures were determined. Equations of the form Ln (activity)= C +1 [A+(T-Tm)N+B] describe thermal inactivation and allow prediction of activity loss following any thermal excursion beyond limits of temperature stability. The experimental parameters A, B, C and N derived from these equations allow precise comparison of temperature sensitivities of cells. Analysis of metabolic heat rates, O2-consumption rates and CO2-evolution rates demonstrated simultaneous shifts in metabolic pathways and metabolic activities towards more anaerobic metabolism below about 12° C and at high temperatures that stress growth of tomato cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00202969
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Diffusivity measurement in a flocculating yeast layer (1991)
    Springer
    Biotechnology techniques 5 (1991), S. 133-138 
    Details
    ISSN: 1573-6784
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The diffusion of small molecules (sugars and alcohols) through a dense layer of flocculating yeast has been studied and compared to the theorical value calculated from parameters such as porosity and yeast density. Lactose, ethanol and methanol were chosen as model molecules. In comparison with water, the diffusion rate of lactose is divided by three. Alcohols which cross the cell envelope diffuse relatively faster than lactose which was assumed not to penetrate the cells. An increase of the lactose diffusion rate is observed when the yeast are heat killed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00159985
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Application of two-dimensional shift correlated NMR techniques to the structure determination of an unusual marine alkaloid, isosaraine-2 (1991)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 29 (1991), S. 327-332 
    Details
    ISSN: 0749-1581
    Keywords: Saraines ; 2D COSY NMR ; 2D 1H-13C COSY NMR ; Alkaloids ; Sponge ; Reniera sarai ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An extensive application of two-dimensional proton-proton and proton-carbon shift correlated spectroscopy allowed the structural elucidation of isosaraine-2, a minor component of an unique family of alkaloids from the sponge Reniera sarai.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260290408
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    Paper (German National Licenses)
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