...+ and Na + of the giant glial cell in isolated ganglia of the leech Hirudo medicinalis . Uncaging GTP-γ-S (injected into a giant glial cell as caged compound) by moderate UV illumination hyperpolarized the membrane due to an increase in K + conductance. Uncaging GTP-γ-S also evoked rises in cytosolic Ca 2...

... is returned to the bath through the Na + /K + -ATPase. * Author for correspondence (e-mail: [email protected]) 28 4 2004 © The Company of Biologists Limited 2004 2004 Drosophila melanogaster Malpighian tubule ion-selective microelectrode K + conductance Cl – conductance...

... between the activation kinetics or voltage-dependence of Na + and K + currents. Conductance levels, however, did vary. Maximum Na + conductance (g Na) in S. sepiodea was significantly less than in the Loligo species. K + conductance (g K) was highest in L. pealei , intermediate in L. plei and smallest...

.... The basolateral membrane potential(V bl) depolarized upon change of bath [K + ] from 3 to 20 mmol l -1 demonstrating a large K + conductance in this membrane. In collecting tubules and collecting ducts a V bl of -66±2 mV and -74±4 mV depolarized by 30±2 mV and 36±3 mV, respectively (N =23; 15). The K + channel...