| http://www.w3.org/ns/prov#value | - Upon deactivation of the external actuator, the flow in the transfer column 250 reverses as the compressed gas volume in the second bubble valve 10 b exerts a pressure on the liquid in the transfer column 250. [0071]FIG. 14 shows a selective resistance circuit employing a bubble valve of the present invention for selectively including a predefined electrical resistance in an electrokinetic circuit
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