title: [Quantitative determination of potassium content of spinal motor neurons frogs by x-ray microanalysis].
abstract: X-ray microanalysis has been made of the potassium content of motoneurons in the frogs Rana ridibunda and R. temporaria. The tissue was frozen in isopentane up to-160 degrees, dried in vacuum at-50 degrees, embedded into epoxy resin and sectioned by ultramicrotome. The obtained mean value of intracellular potassium concentration-65 mM/kg of wet weight or 80 mM/l of intracellular water-is in a good agreement with the results of calculation of intracellular potassium from equilibrium potential of post-spike after-hyperpolarization.
mesh_terms: D000818:Animals; D001001:Anura; D004577:Electron Probe Microanalysis; D005069:Evaluation Studies as Topic; D005727:Ganglia, Spinal / Q000032:analysis*; D008722:Methods; D009046:Motor Neurons / Q000032:analysis*; D011188:Potassium / Q000032:analysis*; D011896:Rana temporaria; D011898:Ranidae; D013045:Species Specificity
chemical_list: D011188:Potassium
vernacular_title: Kolichestvennoe opredelenie soderzhaniia kaliia v motoneironakh spinnogo mozga liagushek metodom rentgenospektral'nogo mikroanaliza