Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Science 21 September 1962:
Vol. 137. no. 3534, pp. 984 - 986
DOI: 10.1126/science.137.3534.984-a
Prev | Table of Contents | Next

Articles

Calcium and Other Ions in Blood and Skeleton of Nicaraguan Fresh-Water Shark

Marshall R. Urist 1

1 Division of Orthopedics, Department of Surgery, University of California Medical Center, Los Angeles 24

The bull shark, Carcharhinus leucas, employing archaic but effective means of regulating the physical-chemical composition of its body fluids, thrives in tropical fresh-water rivers and lakes. The ionic strength of the serum and the concentrations of total solutes, calcium, urea, and other ions are below the levels found in marine elasmobranchs but higher than the levels in teleosts. The patterns of the calcium deposits of the vertebrae are identical in marine and fresh-water subspecies.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Material properties and biochemical composition of mineralized vertebral cartilage in seven elasmobranch species (Chondrichthyes).
M. E. Porter, J. L. Beltran, T. J. Koob, and A. P. Summers (2006)
J. Exp. Biol. 209, 2920-2928
   Abstract »    Full Text »    PDF »
Resistance to a malignant lymphoma in chickens is mapped to subregion of major histocompatibility (B) complex.
W. Briles, R. Briles, R. Taffs, and H. Stone (1983)
Science 219, 977-979
   Abstract »    PDF »
Marek's disease: effects of B histocompatibility alloalleles in resistant and susceptible chicken lines.
W. Briles, H. Stone, and R. Cole (1977)
Science 195, 193-195
   Abstract »    PDF »
Relation between the Major Histocompatibility (B) Locus and Autoimmune Thyroiditis in Obese Chickens.
L. D. Bacon, J. H. Kite Jr., and N. R. Rose (1974)
Science 186, 274-275
   Abstract »    PDF »
Potamotrygon spp.: Elasmobranchs with Low Urea Content.
T. B. Thorson, C. M. Cowan, and D. E. Watson (1967)
Science 158, 375-377
   Abstract »    PDF »
Partitioning of Body Fluids in the Lake Nicaragua Shark and Three Marine Sharks.
T. B. Thorson (1962)
Science 138, 688-690
   Abstract »    PDF »


To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)