| http://www.w3.org/ns/prov#value | - As an organic solvent for forming a porous spreading layer contained dispersively with a mixture of enzyme and protein and/or polypeptide compound, there may be given, for example, nonaqueous solvent such as xylene, benzene, toluene, methanol, ethanol, butanol, acetone, chloroform, tetrahydrofuran and others and what is preferable among them is a water unmiscible organic solvent such as xylene, be
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