In a semiconductor storage device 10 included in a liquid container 20, on reception of an encoding request for encoding readout data, a write-read controller 140 changes over the position of a switch 141 to output encoded readout data, which is obtained by an encoding operation in a data encoding circuit 150, to a data signal terminal SDAT. The present invention also relates to a method for treating neoplastic disease using a composition comprising a catechin compound, ascorbic acid, proline and lysine. The at least one switching element is in thermally conductive contact with a cooling circuit for cooling the fuel cell stack, for example, by mounting the switching element on the end plates of the fuel cell stack.