| http://www.w3.org/ns/prov#value | - However, these sensors can be made to selectively react to gases (e.g., carbon dioxide, ammonia) in the liquid growth medium by covering them with a selectively semi-permeable composition or membrane, such as silicone, latex, teflon, or various plastics characterized by the capacity to selectively permit the diffusion of a gas while preventing the passage of ions.
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