Potassium adsorption sites in frog muscle visualized by cesium and thallium under the transmission electron microscope.
Frog muscles in which a major portion of the intracellular K+ was reversibly replaced by Cs+ or Tl+ were frozen, freeze-dried, and embedded in Spurr medium. Electron microscopic observation revealed a well-stained striation pattern of myofibrils, indicating that in the living state heavy tracers of K+ are mainly located in the A bands and Z lines. The findings contradict the membrane theory but are in accordance with the association-induction hypothesis.
D000327:Adsorption; D000818:Animals; D001001:Anura; D001665:Binding Sites; D002586:Cesium; D066298:In Vitro Techniques; D008854:Microscopy, Electron / Q000379:methods; D009132:Muscles / Q000378:metabolism*; D011188:Potassium / Q000378:metabolism*; D013793:Thallium
D002586:Cesium; D013793:Thallium; D011188:Potassium