The method 9 wherein said {TAIL ~ optically active metal ion} is incorporated into said bead by coprecipitation during {HEAD ~ said sol gel process} 
The method 9 wherein said { TAIL ~ optically active metal ion } is incorporated into said bead by coprecipitation during { HEAD ~ said sol gel process }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD