The electrical characteristics of a glucose-sensitive polymeric hydrogel have been studied. The hydrogel matrices were prepared by radical polymerization of solutions containing 2-hydroxyethyl methacrylate, N,N-dimethyl aminoethyl methacrylate, tetraethylene glycol dimethacrylate, ethylene glycol, water, and glucose oxidase. The hydrogels displayed faster and higher swelling rates for lower levels of a crosslinking agent. Electrical conductivity was found to be a sensitive measurement of the state of the swelling. A simple model that relates hydrogel swelling and conductivity has been proposed.

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Thin films of Y B a 2 C ~3 0 7 -~ (YBCO) were deposited by laser ablation on substrates of sapphire. and MgO coated with buffer layers of YSZ (Y2O3 stabilized ZIOZ) and SrTiO3 deposited by both OMCVD, organometallic chemical vapor deposition, and laser ablation. The Tc (R=O) of YBCO on YSZ was 91K and on SrTiO3 was 93K. The Jc at 77K were 5x103 and 5x106 A/mz for YSZ and SrTiOf buffer layers respectively.

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