The Physiology of Contractile Vacuoles Iii. the Water Balance of Fresh-water Peritricha
نویسنده
چکیده
STRONG evidence has been brought forward (Kitching, 1934, 1936 a) to show that in euryhaline marine peritrich ciliates the contractile vacuole prevents excessive swelling of the body when the organism is placed in dilute sea water. From this it has been inferred (Kitching, 1936 a, p. 24; and 1937) that in fresh-water Protozoa the contractile vacuole normally controls the body volume. In order to test this inference experiments have now been carried out on fresh-water Peritricha. The effects of sulphide and cyanide on fresh-water Peritricha have been investigated for comparison with results already obtained on marine Peritricha. It was found that cyanide could for a short time completely inhibit the actions of the contractile vacuoles of fresh-water Peritricha; therefore experiments were also carried out with solutions of cyanide and sucrose together, with a view to discovering the magnitude of the difference of osmotic pressure between the two sides of the surface membrane of the organism.
منابع مشابه
The Physiology of Contractile Vacuoles v. the Effects of Short-term Variations of Temperature on a Fresh-water Peritrich Ciliate
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The physiology of contractile vacuoles; the effects of short-term variations of temperature on a fresh-water peritrich ciliate.
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