单词 | isotonicity |
释义 | isotonicityn. Physiology. The property or state of being isotonic (sense 2); equality of osmotic pressure; also, degree of osmotic pressure (of the blood). ΘΚΠ the world > life > the body > secretory organs > secretion > [noun] > fluid secretion > degrees of osmotic pressure hypertonicity1896 isotonicity1896 hypotonicity1906 1896 T. L. Stedman 20th Cent. Pract. VII. 284 After twelve or twenty-four hours the solution which is exactly isotonic is determined..and the isotonicity of the blood corpuscles..determined at the same time. 1896 T. L. Stedman 20th Cent. Pract. VII. 284 The isotonicity of the corpuscles is 0·45. 1906 Amer. Jrnl. Physiol. 15 366 Every degree of dilution from isotonicity down to distilled water acts as a stimulus to the heart ganglion of Limulus. 1909 R. J. M. Buchanan Blood in Health & Dis. ix. 182 The isotonicity of the plasma is rather below normal. 1939 A. Krogh Osmotic Regulation in Aquatic Animals 196 The isotonicity normally present between tissue cells and the surrounding medium need not mean, however, that the sum of free ions on both sides of the cellular membrane is the same. 1939 A. Krogh Osmotic Regulation in Aquatic Animals 66 Schwabe (1933)..observed a definite hypotonicity for [the crab] Pachygrapsus marmoratus amounting to 57mM., while he confirmed the absolute isotonicity for Portunus corrugatus. 1951 L. E. H. Whitby & M. Hynes Med. Bacteriol. (ed. 5) vi. 73 The optimum salt concentration is usually near the range of isotonicity to body cells; markedly hypertonic saline diminishes the reaction. 1974 Nature 4 Jan. 50/1 The concentration of calcium was varied from 0 to 2·5 mM (isotonicity was kept constant by appropriate adjustments in the concentration of NaCl). This entry has not yet been fully updated (first published 1976; most recently modified version published online December 2018). < n.1896 |
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