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The effect of salts upon the regeneration of Pennaria tiarella

โœ Scribed by Keil, Elsa M.

Publisher
John Wiley and Sons
Year
1932
Tongue
English
Weight
414 KB
Volume
63
Category
Article
ISSN
0022-104X

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โœฆ Synopsis

Moderate dilutions of sea water have been shown to increase the rate of regeneration in certain marine invertebrates (Loeb, '92 ; Snyder, '05 ; Goldfarb, '07, '14 ; Child, '07 ; Peebles, '08, and Lloyd, '14). Sayles ( '28) found that dilution of the body fluids was an important factor in regenerative activity in Lumbriculus. Also' Loeb ( '92) and Goldfarb ( '07) showed that increasing concentrations of sea water have a progressively retarding effect on the formation of new tissue in regeneration.

The question arises-Is this due to changes of the osmotic pressure alone? I n an attempt to answer this question, several series of experiments were begun at Woods Hole during the summers 1930 and 1931. An account of the results is presented here.l

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## Abstract Limb regeneration was induced in 4โ€day chick embryos by implanting stage 15 neural tube into the amputated stump of the limb. In control animals, amputation alone or amputation with implant of either notochord or somites resulted in development of proximal wing segments only. In experim