title: X-ray absorption edge fine structure of potassium ions in various environments: application to frog blood cells.
abstract: The edge spectrum is a sensitive probe of local chemistry. Edge spectra of potassium in various chemical environments were measured, and each environment gives a unique edge spectrum. Hydrated potassium has a unique spectrum that is insensitive to counterions. Comparison of the spectra shows that the chemical state of potassium in cells differs appreciably from that in aqueous solutions.
mesh_terms: D000818:Animals; D001001:Anura; D004912:Erythrocytes / Q000032:analysis*; D010100:Oxygen / Q000097:blood; D011188:Potassium / Q000097:blood*; D011894:Rana pipiens; D012996:Solutions; D013057:Spectrum Analysis; D014867:Water; D014965:X-Rays
chemical_list: D012996:Solutions; D014867:Water; D011188:Potassium; D010100:Oxygen