Biological substances are observed by employing {HEAD ~ a high internal gradient magnetic capture structure} formed within {TAIL ~ a vessel}, in conjunction with an externally applied force for transporting magnetically responsive material toward the capture structure 
formed within
Biological substances are observed by employing { HEAD ~ a high internal gradient magnetic capture structure } formed within { TAIL ~ a vessel } , in conjunction with an externally applied force for transporting magnetically responsive material toward the capture structure
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH