| http://www.w3.org/ns/prov#value | - The positive and negative electrodes 71 and 72 are spaced apart a suitable distance such as 2.0 to 8.0 centimeters to allow an ionic current flow between the positive and negative electrodes 71 and 72. [0060] Upon energizing the direct current power supply 80, an ion current flows between the positive and negative electrodes 71 and 72.
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