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Changes in osmotic pressure and swelling in horseshoe crab embryos during development

Changes in osmotic pressure and swelling in horseshoe crab embryos during development

Development Growth and Differentiation 27(1): 51-56

ISSN/ISBN: 0012-1592

Water influx accompanying the swelling of embryos during normal development of horseshoe crabs, Limulus polyphemus and Tachypleus tridentatus, following a rupture of the chorion, was analyzed. The increase in volume of perivitelline fluid during development was about 90% of the increase in total embryo weight. Considerable water discharge was observed on drying the embryos in air and a reversible water influx occurred with a second immersion in sea water, even though the embryos died as a result of this treatment. Since the osmotic pressure of the perivitelline fluids decreased markedly during development until the end of swelling, a close correlation between swelling and osmotic pressure was recognized. These results indicate that certain osmoactive substances may be produced in the perivitelline fluid at the initial stage of swelling.

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Accession: 004910095

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