The apparatus, which may have a configuration similar to that of a felt tip marking pen, allows {HEAD ~ convenient use} of {TAIL ~ low volatility solvents} in the catalyst solution 
of
The apparatus , which may have a configuration similar to that of a felt tip marking pen , allows { HEAD ~ convenient use } of { TAIL ~ low volatility solvents } in the catalyst solution
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH