Jeffery R. Demarest, Ph.D.


Professor of Biology
Chair of the Biology Department



Dr. Demarest

Contact Dr. Demarest



Professor Demarest earned his B.S. degree (magna cum laude) from Monmouth College and his Ph.D. from the University of California at Berkeley. He acquired additional training in physiology at the Duke University Marine Laboratory and the University of North Carolina School of Medicine, Chapel Hill and at the Bodega Marine Laboratory of the University of California.

Dr. Demarest came to Juniata College in 1994, and he has served as Chair of the Biology Department since the Spring of 1994. Previously, Dr. Demarest served as an assistant research physiologist and lecturer at the University of California at Berkeley, a lecturer in the Department of Zoology at the University of California Davis; a consulting scientist at the Center for Ulcer Research and Education at U.C.L.A.; a visiting scientist at the Marine Biological Laboratory in Woods Hole, Mass.; a research associate in the department of medicine at the University of North Carolina, Chapel Hill; and as a biophysicist at Bodega Marine Laboratory.

Dr. Demarest has presented more than 30 papers at professional scientific meetings and has published more than a dozen peer reviewed research papers, among which is a chapter in The Handbook of Physiology published by the American Physiological Society. He has also served as a referee for several scientific journals and as an ad hoc grant proposal reviewer for the National Science Foundation and National Institutes of Health.

He is a member of the American Association for the Advancement of Science, the American Physiological Society, the American Society of Cell Biology and the Society of General Physiologists. Dr Demarest is a member of the Council on Undergraduate Research and serves a Councilor for the Biology Division of CUR. Dr. Demarest is also a life member of the Sierra Club.

His primary research interests include cell biology and biophysics of gastrointestinal and renal epithelial transport, as well as comparative physiology of osmoregulation and electroreception in fish. His research and teaching have been supported by grants from the Howard Hughes Medical Institute, National Science Foundation, National Institutes of Health, the Marine Biological Laboratory, Smith-Klein-Beckman Foundation and the University of California, Berkeley.

Since he came to Juniata, many students have performed independent research projects with Dr. Demarest. To learn more about past and current student research in Dr. Demarest’s lab, see the Student Research page.



 BI 222 Cell Biology

 BI457 Microscopy

 BI 489 Biology Research


 BI 310 Physiology

 BI 311 Physiology Laboratory

 BI 489 Biology Research

Dr. Demarest

Professional Activities

Professional Society Memberships:

ad hoc proposal referee:

  • National Science Foundation
  • National Institutes of Health

Journal referee:

  • American Journal of Physiology: Cell Physiology; Gastrointestinal and Liver Physiology; Renal, Fluid and Electrolyte Physiology; Regulatory
  • Integrative and Comparative Physiology
  • American Zoologist
  • Canadian Journal of Zoology
  • Handbook of Physiology, American Physiological Society
  • Proceedings of the Society for Experimental Biology and Medicine


Research Interests

Cell biology and biophysics of gastrointestinal and renal epithelial transport; comparative physiology of osmoregulation and electroreception in fish

Selected Publications


Cheesman, K.L., J.A. Hughes, J.R., Demarest and N.S Mills (2001) Facilitating Research with Undergraduate Students: Role of the Science Department Chair. CUR Quarterly 22:76-80


Demarest, J. R. and J. L. M. Morgan. (1995) The effects of pH buffers on acid secretion from isolated gastric oxyntic cells measured with vibrating ion-selective electrode. Biol. Bull. 189:119-120.

Morgan, J. L. M., A. Shipley and J. R. Demarest. (1994) Measuring electroneutral ion flux from isolated epithelial cells with a vibrating ion selective electrode. Biophysical J. 66:A115.

Bersi, T., D.D. Rhoads, A. Smolka and J. R. Demarest. (1993) Acidosis induced elevation of a gastric H/K-ATPase related protein in the gills and kidneys of aquatic vertebrates. Mol. Biol. Cell 4 (Suppl.):334a.

Demarest, J. R. and D. D. F. Loo. (1990) Electrophysiology of the parietal cell. In J.F. Hoffman, editor, Annual Review of Physiology 52:307-319.

Demarest, J. R. and T. E. Machen. (1989) Electrophysiology of the gastric mucosa. pp. 185-205 In "Handbook of Physiology." Vol. III. Gastrointestinal System. Sect. 6. Salivary, Gastric, Pancreatic and Hepatobiliary Secretion. (J.G. Forte, ed.), Bethesda, MD, American Physiological Society.

Demarest, J. R., D. D. F. Loo and G. Sachs. (1989) Activation of apical chloride channels in gastric oxyntic cells. Science 245:402-404.


You can e-mail Prof. Demarest at

Office Location: BSC B231
Office phone: (814) 641-3578

Biology Department
Juniata College
Huntingdon, PA 16652

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