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