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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
    Defensive allomones in three species ofHypselodoris (gastropoda: Nudibranchia) from the Cantabrian sea (1993)
    Springer
    Journal of chemical ecology 19 (1993), S. 339-356 
    Details
    ISSN: 1573-1561
    Keywords: Opisthobranch ; nudibranch ; Hypselodoris ; chemical defense ; prey-predator relationship ; mantle dermal formations ; furanosesquiterpenoids ; Dysideidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract ThreeHypselodoris species,H. villafranca, H. cantabrica, and H. tricolor, have been studied in order to further investigate the defensive strategies of Chromodorididae mollusks from Iberian coasts. All animals possess large amounts of furanosesquiterpenoids, probably derived from their diet of sponges. The products are transferred and stored in specific sites of the mantle (mantle dermal formations, MDFs) to be used as chemical deterrents against predators. Chemical analysis of CantabrianHypselodoris species has led to the characterization of eight sesquiterpenoids. Among these, six have been found previously in both sponges and nudibranchs, while two are new natural products.Hypselodoris species cooccurring in the same area contained comparable mixtures of sesquiterpenoids. However, two populations ofH. cantabrica from different sites of the Cantabrian sea showed different metabolic patterns. All sesquiterpenoids induce feeding deterrence inCarassius auratus and two are also toxic toGambusia affinis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00993700
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    Paper (German National Licenses)
    Fulltext
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