In biological systems, oscillatory reactions are often found. These reactions, so-called biological oscillators, have a characteristic oscillation period ranging from seconds to years [1]. For the oscillation in which an enzyme is involved, the reaction has been studied both experimentally [2 -5] and theoretically [6 -10]. In many cases, temperature control, stirring, or continuous flow of the reactant is necessary to observe continuous oscillation. No trial has been made yet to control the oscillation period or waveform. Here, we report an enzymatic oscillation reaction using catalase and glucose oxidase in which the oscillation period and waveform can be changed by the addition of glucose. We achieved good reproducibility with an oscillation period and waveform change that was sufficient to be applied to the glucose quantification. The effect of coexisting chemicals such as ascorbic acid, urea, or acetamidophenol on the oscillation is examined.

A simple MEMS phase shifter consisting of a coplanar wave guide and a movable ground plane was proposed. The operating principle is based on the effective dielectric constant modulation. The operating principle was first confirmed by electromagnetic analysis. Then, it is demonstrated by a simple experiment using fixed ground planes.

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