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Divalent cations and electrical properties of cortical cells

✍ Scribed by Kelly, J. S. ;Krnjevic, K. ;Somjen, G.

Publisher
John Wiley and Sons
Year
1969
Tongue
English
Weight
677 KB
Volume
1
Category
Article
ISSN
0022-3034

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✦ Synopsis

  1. Ca2+ and Mg*+ have been applied by microiontophoresis, mainly in doses of 20-200 nA, to cortical cells in cats under Dial.

  2. Both divalent cations had a similar action, causing a sharp but reversible fall in the electrical excitability of neurones.

  3. Ca2+ was slightly more potent than Mg2+; in small doses the two cations had an additive effect.

  4. The fall in neuronal excitability was not associated with definite changes in membrane potential or resistance.

  5. The amounts of Ca2+ and Mg2+ applied did not cause any obvious alteration in synaptic efficiency.

  6. The membrane properties of unresponsive cells (probably neuroglia) were not markedly altered by the divalent ions, except for an occasional increase in membrane resistance.

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A series of \(\mathrm{LaCr}_{1-x} M_{x} \mathrm{O}_{3}(M=\mathrm{Mg}, \mathrm{Cu}, \mathrm{Zn}, \mathrm{Ni})\) ceramics was fabricated by a conventional sintering process in air and Ar gas. Relative density, electrical conductivity, and magnetic susceptibility were measured to investigate the electr