The resistor provides {TAIL ~ a difference} in resistance between the conductive elements when contacted with a fluid comprising a chemical analyte at a first concentration, than when contacted with a fluid comprising {HEAD ~ the chemical analyte} at a second different concentration 
The resistor provides { TAIL ~ a difference } in resistance between the conductive elements when contacted with a fluid comprising a chemical analyte at a first concentration , than when contacted with a fluid comprising { HEAD ~ the chemical analyte } at a second different concentration
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH