Dr. Gregory Stephens

Associate Professor

Contact

Stephens

Office: 236 Wolf Hall

Mailing address:
Dept. of Biological Sciences
Wolf Hall
University of Delaware
Newark, DE 19716

Phone: (302) 831-3040
Fax: (302) 831-2281
E-mail: gstephen@udel.edu

Go to top of page

Education

B.S., Ph.D.: University of Kansas

Go to top of page

Research Interests

My research is currently done in collaboration with Professor David Usher. We are studying the evolution of lipid transport using the turtle as a model. Turtles, being poikilothermic, have less energetic demands than mammals and, one would think, less need for dietary fatty acid uptake and transport. Also, because they experience large fluctuations in body temperature, they may have a greater need to regulate (and possibly change) membrane cholesterol concentrations. This suggests that the evolutionary pressures for apolipoproteins structure and function should be very different in turtles compared to mammals. Preliminary studies have in our lab have suggested that this hypothesis is correct.

Go to top of page

Teaching

• BISC 106 - Elementary Human Physiology
• BISC 306 - General Physiology
• BISC 498 - Topics in Biology
• BISC 675 - Cardiovascular Physiology

Go to top of page

Selected Publications

Cain, W., L. Song, G. Stephens, and D. Usher. Characterization of Lipoproteins from the Turtle, Trachemys scripta elegans, in Fasted and Fed States. Comparative Biochemistry and Physiology (in press).

Silldorf, E.P. and Stephens, G.A. 1992. Effects of Converting Enzyme Inhibition and Alpha Receptor Blockade on the Angiotensin Pressor Response in the American Alligator. Gen. Comp. Endocrinol. 87:134-140.

Silldorff, E.P. and Stephens, G.A. 1992. The Pressor Response to Exogenous Angiotensin I and its Blockade by Angiotensin II Analogues in the American Alligator. Gen. Comp. Endocrinol. 87:141-148.

Sanford, B. and Stephens, G.A. 1988. The effects of adrenocorticotropin hormone and angiotensin II on adrenal corticosteroid secretions in the freshwater turtle Pseudemys scripta. Gen. Comp. Endocrinol. 72:107-114.

Go to top of page