Active transport of Calcium ions in the skin of the salamander Ambystoma tigrinum
| Autor: | M. J. Zerella, D. F. Stiffler |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
animal structures
Physiology Sodium Kinetic analysis Biological Transport Active chemistry.chemical_element Fresh Water Calcium Ambystoma Biochemistry Ion Endocrinology biology.animal Animals Electrochemical gradient Ecology Evolution Behavior and Systematics Skin Larva integumentary system biology fungi Age Factors Metamorphosis Biological Anatomy Affinities Kinetics chemistry Biophysics Salamander Animal Science and Zoology Protons |
| Zdroj: | Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology. 169:481-486 |
| ISSN: | 1432-136X 0174-1578 |
| DOI: | 10.1007/s003600050245 |
| Popis: | We measured Ca2+ exchanges across the skin of larval and adult Ambystoma tigrinum using the radio-isotope influx method. We found that the skin of both morphs takes up Ca2+ in a manner that is proportional to external [Ca2+], saturable and oriented against the electrochemical gradient for Ca2+. We conclude that this uptake occurs by active transport. Kinetic analysis yields affinities for calcium ions that are similar to the affinities for both Ca2+ and Na+ in the skin of other amphibians. The capacity for calcium is similar to Ca2+ capacity in other amphibians. The capacity for Ca2+ is lower than the capacity for Na+. Cutaneous Ca2+ deposits are lower in this urodele than found in anurans. Adults tend to have higher levels of Ca in their skin than do larvae. |
| Databáze: | OpenAIRE |
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