Mechanisms other than the conformational change of PSTI associated with amino-acid substitution, such as abnormal splicing, may underlie the predisposition to pancreatitis in patients with the N34S mutation.

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The dielectric properties of the B~( C O , ,~N~~, .~) O .~-B~( Z~~,~N~~,~) O~ system were determined. B~( C O~,~N~~,~~) O~~-B~( Z~, ,~~N~~~~) O~ has a complex perovskite structure, a high dielectric constant, a low dielectric loss, and a low temperature coefficient of the resonant frequency. A solid-solution ceramic with

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018ChemInform Abstract have been investigated at microwave frequencies. The title ceramics have a complex perovskite-type structure and they are found to have a high dielectric constant, a low dielectric loss, and a low temp. coefficient of the resonant frequency which can be varied by changing the composition. The Q value of the ceramics can be increased by annealing in N2. The ceramics can be used for resonant elements and stabilized oscillators.