A hydrophobic, porous, oxygen permeable layer is positioned between {HEAD ~ the reagent layer} and the support, such that oxygen can permeate to {TAIL ~ the layer} containing oxidase 
A hydrophobic , porous , oxygen permeable layer is positioned between { HEAD ~ the reagent layer } and the support , such that oxygen can permeate to { TAIL ~ the layer } containing oxidase
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH