𝔖 Bobbio Scriptorium
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Prolactin-thyroxine antagonism and the metamorphosis of visual pigments inRana catesbeiana tadpoles

✍ Scribed by Crim, Joe William

Book ID
102891211
Publisher
John Wiley and Sons
Year
1975
Tongue
English
Weight
628 KB
Volume
192
Category
Article
ISSN
0022-104X

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✦ Synopsis

Abstract

The relationship between prolactin‐thyroxine antagonism and the metamorphosis of visual pigments in larval amphibians has been investigated using bullfrog (Rana catesbeiana) tadpoles. Although prolactin‐thyroxine antagonism is demonstrable by morphological criteria, ovine prolactin does not appear to antagonize thyroxine‐induced rhodopsin synthesis. The hypothesis is offered that prolactin‐thyroxine antagonism is the result of differential gene activities which are opposite in their physiological effects.

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✍ Wright, Mary L. ;Jorey, Suzanne T. ;Blanchard, Linda S. ;Basso, Carolyn A. 📂 Article 📅 1988 🏛 John Wiley and Sons 🌐 English ⚖ 909 KB

Since Rana pipiens tadpoles injected with thyroxine (T4) early in the dark develop more slowly than those injected in the light, we studied the effect of giving a light pulse of 1 hr early in the dark. Tadpoles injected under a 7.5-W red light bulb in a darkened room with 0.2 microgram T4 daily at 2