| 单词 | poikilosmotic |
| 释义 | poikilosmotic, a. Physiol.|ˌpɔɪkɪlɒzˈmɒtɪk|
Also poikilo-osmotic |ˌpɔɪkɪləʊɒzˈmɒtɪk|.
[ad. G. poikilosmotisch (R. Höber Physikal. Chem. der Zelle und der Gewebe (1902) ii. 26): see poikilo- and osmotic a.]
Of an animal: that allows the concentration of solute in its body fluids to vary with fluctuations in that in the surrounding medium. Opp. homœo-osmotic s.v. homœo-.
1905Biol. Bull. VIII. 262 All of the marine invertebrates which we have worked with are truly ‘poikilosmotic’. Two factors may be at work in producing the variations in the osmotic pressure, viz., the interchange of water, and of salts. 1931Biol. Rev. VI. 473 Characteristically marine forms such as Hyas, Cancer and the polychaete Nereis cultrifera only respond to lowered external salinity by passive swelling till their blood is isotonic with the medium. Such ‘poikilosmotic’ organisms show no change in oxygen consumption during this process. 1953E. Palmer tr. Ekman's Zoogeogr. Sea vi. 118 The marine invertebrates were until recently considered to be poikilo-osmotic. 1971Biol. Abstr. LII. 5434/1 Poikilosmotic animals are actually slightly hyperosmotic as against their external medium in the normal circumstances of the animal's existence.
Hence ˌpoikilosˈmosis, ˌpoikilosmoˈticity, the state or property of being poikilosmotic.
1935Proc. Linnean Soc. N.S.W. LX. 244 A ‘law of poikilosmoticity’ is by no means applicable to all marine invertebrates when the surrounding water is of lower salinity than ordinary sea-water. 1939A. Krogh Osmotic Regulation in Aquatic Animals 242 (Index), Poikilosmosis. 1955Elkinton & Danowski Body Fluids ii. 50 In many invertebrates the poikilosmoticity is only relative and..steady states are maintained with respect to both total osmolarity and individual ionic levels. 1971Biol. Abstr. LII. 5434/1 (heading) On poikilosmosis and iso-osmosis. |
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