|
|||||
|
|
Na+/ K+-pump activity in photoreceptors of the blowfly Calliphora : a model analysis based on membrane potential measurements |
|
| Authors: | U Gerster D G Stavenga W Backhaus |
| Institution: | (1) Free University of Berlin, Theoretical and Experimental Biology, Department of Biology, Thielallee 63, D-14195 Berlin, Germany Tel.: +49–30/8383182, Fax: +49–30/8384323, e-mail: gerster@zedat.fu-berlin.de, DE;(2) University of Groningen, Department of Biophysics, Nijenborgh 4, NL-9747 AG Groningen, The Netherlands, NL |
| Abstract: | Na+/K+-pump activity and intracellular Na+ and K+ concentration changes in blowfly photoreceptors are derived from intracellular potential measurements in␣vivo with a model based on the Goldman-Hodgkin-Katz theory for membrane currents. The relation between the intracellular Na+ concentration and the pump activity appears to follow a Hill function with a Hill coefficient of 1 and a maximal possible Na+ current due to pump activity of about −4 nA. The developed photoreceptor model incorporates the slow and fast voltage-dependent K+ channels of the blowfly photoreceptor of which the properties were taken from the literature. Accepted: 5 August 1996 |
| Keywords: | Sodium pump Photoreceptor Afterhyperpolarization Voltage-dependent K+-channel Blowfly Calliphora |
| 本文献已被 SpringerLink 等数据库收录！ | |