... channels in an insect epithelium. * Author for correspondence (e-mail: [email protected] ) 10 12 2002 © The Company of Biologists Limited 2003 2003 K + transport K ATP channel Malpighian tubules Tenebrio molitor glibenclamide basolateral membrane potential fluid...

... ) 10 12 2002 © The Company of Biologists Limited 2003 2003 K + transport K + uptake Malpighian tubules Tenebrio molitor K + channel Na + /K + /2Cl - cotransporter Na + /K + -ATPase basolateral membrane apical membrane fluid secretion rate membrane potential...

... segment neither secreted nor reabsorbed K + . There was pronounced spatial heterogeneity in K + transport by the lower segment and the main segment; not all morphologically similar cells participated equally in K + transport, nor did all main segment cells respond equally to stimulation of K + transport...

...J. Küppers; I. Bunse ABSTRACT The enzyme involved in outward K + transport in insect epithelia belongs to the family of V-ATPases. Evidence has been reported relating the generation of the K + gradient to a primary electrogenic proton transport via a distinct electrophoretic n H + /K + antiport...

... tobacco hornworm Manduca sexta midgut K + transport transepithelial potential alkalization The isolated midgut of lepidopteran larvae secretes K + at a high rate by an electrogenic mechanism that generates a transepithelial electric potential (TEP) which may initially exceed 100 mV...

...Frank B. Jensen ABSTRACT The regulation of K + transport across the red blood cell (RBC) membrane by haemoglobin (Hb) conformation was studied in carp, and the K + transport mechanisms were identified. When a large proportion of Hb in the R quaternary structure was secured by oxygenation of blood...

...: Cardiovascular Research Institute, University of California, San Francisco, CA 94143-0532, USA. † To whom reprint requests should be sent. 31 07 1990 © 1991 by Company of Biologists 1991 lepidopteran insect midgut K + transport intracellular pH H + transport H + -elective...

... or electrical coupling between the transporting goblet cells and the non-transporting columnar cells. Hypoxia reduced transepithelial K + transport, both in the absence and in the presence of Ba 2+ . In the absence of Ba 2+ , (K + ) i was within a few millivolts of equilibrium and the effect of hypoxia...

... that is responsible for transepithelial K + transport is located on the apical membrane of goblet cells. In the present study the transapical potentials and K + chemical activity [(K + )] gradients of columnar and goblet cells of posterior midgut were examined in the short-circuited gut. In some experiments...

...David F. Moffett; Alan R. Koch ABSTRACT The isolated midgut of lepidopteran larvae actively transports K from haemolymph to lumen, providing a model for K transport in insect secretory and excretory tissues (reviewed by Harvey, 1980 ). The dependence of this transport on extracellular K has been...