Because the beads have a generally spherical surface, {HEAD ~ the radius} of {TAIL ~ curvature} provides an additional distinguishing characteristic by which a particular sample may be identified 
Because the beads have a generally spherical surface , { HEAD ~ the radius } of { TAIL ~ curvature } provides an additional distinguishing characteristic by which a particular sample may be identified
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH