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Electron paramagnetic resonance spectroscopy has been heavily used for the study of vanadium(IV) compounds in both naturally containing vanadium species and spin-labeled or metal-substituted systems. Vanadium compounds have been shown to possess potent antidiabetic properties such as normalization of blood glucose levels and lipid metabolism. Vanadium compounds, and in particular vanadyl (VIVO2+)...
For many years, the carcinogenicity of Cr(VI) and the antidiabetic effects of Cr(III) compounds were regarded as independent biological activities, but recent evidence suggests that both these types of activities arise from varying amounts of Cr(VI) and reactive intermediates, such as Cr(V) species, which can be formed in vivo either by reduction of Cr(VI) or by oxidation of Cr(III) complexes. Applications...
High-frequency EPR and ENDOR techniques have proved useful in characterizing gadolinium-based MRI contrast agents. The result of these studies is a better understanding of the mechanism of action of these contrast agents, and this in turn has aided the design of more potent nuclear relaxation agents. This chapter first takes a broad overview of MRI contrast agents and the need for EPR studies. High-frequency...
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