PubMed Health⌕ Search
Home/Archive/PubMed

PubMed · 574269

Low impedance coaxial K+ selective microelectrodes.

E Ujec·O Keller·J Machek·V Pavlik
View original source ↗Export metadata ↓

Abstract

A procedure for preparing coaxial K+ selective microelectrodes with a low longitudinal resistance (Re) of the liquid ion exchanger selective barrel is described. The low resistance was attained by inserting another microelectrode filled with 0.5 mol . 1-1 KCl into the ion-exchanger column (Corning 477317). The lower longitudinal resistance decreases the noise level and consequently increases the resolving power five times. This modification makes it possible to measure small and rapid K+ concentration changes.

Explore related subjects

ElectrophysiologyMicroelectrodesPotassiumJournal Article

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

E Ujec, O Keller, J Machek, V Pavlik. 1979. Low impedance coaxial K+ selective microelectrodes.. https://doi.org/10.1007/bf00584221

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

PubMed2007

Acute effects of estrogen on neuronal physiology.

It has been known for more than 30 years that estrogen can alter the intrinsic and synaptic physiology of neurons within minutes. The physiological significance of these acute effects has been unclear, however, because some effects require higher concentrations of estrogen than are detected in plasma, and because estrogen secreted by the ovary rises and falls over a time course of days, not minutes. These concerns may be answered by new research demonstrating that estrogen is produced at high levels within the brain itself, and that production of estrogen in the brain may be regulated by neuronal activity. Additionally, recent studies indicate that classical estrogen receptor proteins are found not only in the nucleus where they regulate gene expression but also at extranuclear sites, including at synapses. These findings, together with evidence for new types of extranuclear estrogen receptors, suggest that estrogen might act directly at synapses to activate second messenger signaling, thereby rapidly altering neuronal excitability, synaptic transmission, and/or synaptic plasticity.

Electrophysiology↗