Crystal growth was monitored by determining the amount
of [4C]oxalate remaining in solution at different intervals
during the first 2 h after the seed crystals were added to the
system. The solution was kept in a water bath at 37 #{176}C with
continuous magnetic stirring. Samples were withdrawn at 30,
60, 90, and 120 mm, passed through Millipore filters, and
measured for radioactivity.