Date of Award


Document Type


Degree Name

Master of Science

Degree Discipline



Since previous investigations have shown that thyroxine-treated tadpoles show an increase in the mitotic activity and the DNA and RNA content in the brain, it was decided to determine the effects of triiodothyronine, if any, on other tissues of the developing tadpole. It seemed feasible to investigate the effects of triiodothyronine, on peripheral tissue, the skin and muscles of the tail, of the tadpole with respect to the nucleic acid content.

Rna clamitans tadpoles were used to study the effects of triiodothyronine on the DNA and RNA content of the skin and muscles. The tadpoles used in this study were in stages XII to XV. They were staged from descriptions given by Taylor and Kollros (1946), for Rana pipiens larvae. Fifty tadpoles were used in this investigation. Twenty-five were designated as controls and twenty-five designated as experimentals. The tadpoles were approximately 75 mm in length, and were kept in finger bowls at room temperature in tap water before use. The animals were fed mustard greens during the entire experiment and the water was changed daily.

Committee Chair/Advisor

E. W. Martin

Committee Member

J. E. Berry

Committee Member

T. P. Dooley

Committee Member

E. K. Jones


Prairie View A&M College


© 2021 Prairie View A & M University

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

Date of Digitization


Contributing Institution

John B Coleman Library

City of Publication

Prairie View




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