{HEAD ~ An electromechanical measurement cell} 2, wherein said organic acid is {TAIL ~ a citric acid} 
{ HEAD ~ An electromechanical measurement cell } 2 , wherein said organic acid is { TAIL ~ a citric acid }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL