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Adaptations with respect to salinity

E Schoffeniels

    Biochemical Society Symposium
    |January 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Euryhaline invertebrates regulate intracellular amino acids to manage osmotic pressure. Environmental salinity controls amino acid metabolism, protein synthesis, and transport, with inorganic ions potentially triggering these responses.

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    Area of Science:

    • Marine Biology
    • Environmental Physiology
    • Biochemistry

    Background:

    • Amino acids are crucial for intracellular osmotic pressure in aquatic invertebrates.
    • Euryhaline invertebrates are excellent models for studying amino acid metabolism control due to salinity-dependent concentration changes.

    Purpose of the Study:

    • To investigate the mechanisms controlling amino acid metabolism in euryhaline invertebrates under varying salinity conditions.
    • To elucidate the roles of protein synthesis, amino acid transport, and metabolic turnover in osmotic adaptation.

    Main Methods:

    • Analysis of CO2 production, O2 consumption, and nitrogen excretion rates.
    • Measurement of cyclic AMP concentration and blood protein/hemocyanin levels.
    • Use of labeled substrates to track amino acid turnover and oxidation in whole animals and isolated tissues.

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    Main Results:

    • Hyperosmotic stress decreased CO2 production and O2 consumption, while hypo-osmotic stress increased them.
    • Nitrogen excretion (NH3) rose in low salinity, and cyclic AMP increased during hyperosmotic stress.
    • Amino acids are released from cells, oxidized in gills, or used for blood protein synthesis in organs like the hepatopancreas.

    Conclusions:

    • Environmental salinity directly controls amino acid metabolism, protein synthesis, and transport in euryhaline invertebrates.
    • Inorganic ions may initiate metabolic responses by influencing dehydrogenase activity and reducing equivalent pathways.
    • These findings highlight sophisticated mechanisms for maintaining osmotic balance in fluctuating aquatic environments.