title: Subthreshold changes in excitable membranes of Cucurbits pepo L. stem cells during cooling-induced action-potential generation.
abstract: The nature of subthreshold changes in excitable plasma membranes has been investigated in stem parenchyma cells of Cucurbita pepo L. during action-potential generation induced by gradual cooling (from 23 to 10 ° C). The character of the subthreshold depolarization of excitable cells is shown to be mainly defined by a decrease in the activity of the plasma-membrane electrogenie pump (H(+)-ATPase). In its turn, the pump activity is controlled by thermal changes in the structure of the membrane lipid matrix. Based on the results obtained, a sequence of subthreshold changes has been suggested in which thermally induced structural rearrangements of membrane lipids play the role of trigger.
authors.affiliation: Biological Faculty, N.I. Lobachevsky State University, Gagarin Avenue 23, 603600 GSP-20, Gorky, USSR.
authors.forename: S S
authors.initials: SS
authors.lastname: Pyatygin
authors.forename: V A
authors.initials: VA
authors.lastname: Opritov
authors.forename: V A
authors.initials: VA
authors.lastname: Khudyakov