Skip to main content
Magnetic Properties of Tunicate Blood Cells. I. Ascidia nigra
Journal of Inorganic Biochemistry
  • Seunghee Lee, Columbia University
  • Kenneth Kustin, Brandeis University
  • William E. Robinson, Harold E. Edgerton Research Laboratory
  • Richard B. Frankel, California Polytechnic State University - San Luis Obispo
  • K. Spartalian, University of Vermont
Publication Date
The magnetic properties of intact and freeze-dried blood cells of the tunicate Ascidia nigra and of model vanadium(III) and (IV) compounds as polycrystalline solids and in aqueous solution have been measured up to 50 kOe with a SQUID susceptometer. Corrections for the samples' diamagnetism were extracted from the temperature dependence of the data without any further assumptions. For vanadium(IV), measured values of the magnetic moment at different values of the applied magnetic field over the temperature range 2–100 K obey a Brillouin function with spin 1/2. For vanadium(III), the magnetic moment data did not obey a Brillouin function and were analyzed in terms of a spin Hamiltonian with S = 1. Measurements on both whole and freeze-dried blood samples give consistent results with vanadium(III) the predominant species. These results are discussed in terms of the mechanisms of vanadium accumulation and the use of vanadium oxidation states as criteria of ascidian taxonomy.
Citation Information
Seunghee Lee, Kenneth Kustin, William E. Robinson, Richard B. Frankel, et al.. "Magnetic Properties of Tunicate Blood Cells. I. Ascidia nigra" Journal of Inorganic Biochemistry Vol. 33 Iss. 3 (1988) p. 183 - 192
Available at: