It has now been found that these metals exert in {TAIL ~ the form} of metal ion concentrations only of {HEAD ~ the order} of about 1×10 6 M a profound bactericidal effect 
It has now been found that these metals exert in { TAIL ~ the form } of metal ion concentrations only of { HEAD ~ the order } of about 1×10 6 M a profound bactericidal effect
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH