| http://www.w3.org/ns/prov#value | - A method of forming a permselective layer on preselected areas of a substantially planar sensing device which comprises:(a) establishing at least one film comprising a silane compound mixed with a suitable solvent on a substantially planar sensing device, said compound having the formula R'n Si(OR)4-n, in which n is an integer selected from the group consisting of 0, 1 and 2; R' is a hydrocarbon r
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