Publication Detail

Magnetic Properties of Tunicate Blood Cells Ascidia Certodes

Kenneth Kustin, William E Robinson, Richard B. Frankel
7 pp.
MITSG 97-13
$3.50 domestic; 5.50 foreign. DOM

The magnetic properties of intact blood cells of the tunicate "Ascidia ceratodes" have been measured with a SQUID (superconducting quantum interference device) susceptometer. Analysis of total metal contents by plasma emmission spectroscopy and V(IV) content by epr indicates that approximately 5% of the accumulated vanadium is +4 vanadyl ion. Measured values of the magnetic moment depend on the magnitude of the field, indicating magnetic aniosotropy of the ground state. The model that fits the data best is a dimer with one V(III) S=1 ion ferromagnetically coupled to a second V(III) S=1 ion, with spin-coupling constant, and 5% of the total vanadium content in the form of a V(IV) S=1/2 ion. Since vanadium in "A. ceratodes" is known to reside in at least three different types of blood cells, the excellent fit indicates that the metal is stored predominantly as a dimer regardless of blood cell type.

type: Technical reports

Parent Project

Project No.: 1996-RB-37
Title: Relationship Between Vanadium and Tunichrome in Sea Squirts

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