We have modified the procedure of Saimi and Martinac (1989) to study i
on channels in plasma membrane of Paramecium. The modifications includ
e a change in isolation of plasma membrane and changes in the process
of G Omega-seal formation and electrophysiological recording. We have
applied the procedure to investigate ion channels in Stenter coeruleus
. Activities of two types of ion channels we encountered are presented
in this report.