Possible screening of surface charges on crayfish axons by polyvalent metal ions
نویسندگان
چکیده
منابع مشابه
Magnitude and location of surface charges on Myxicola giant axons
The effects of changes in the concentration of calcium in solutions bathing Myxicola giant axons on the voltage dependence of sodium and potassium conductance and on the instantaneous sodium and potassium current-voltage relations have been measured. The sodium conductance-voltage relation is shifted along the voltage axis by 13 mV in the hyperpolarizing direction for a fourfold decrease in cal...
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متن کاملThe periaxonal space of crayfish giant axons
The influence of the glial cell layer on effective external ion concentrations has been studied in crayfish giant axons. Excess K ions accumulate in the periaxonal space during outward K+ current flow, but at a rate far below that expected from the total ionic flux and the measured thickness of the space. At the conclusion of outward current flow, the external K+ concentration returns to normal...
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The effects of Goniopora toxin (GPT), isolated from the coral Goniopora species, on the crayfish giant axon have been studied by means of microelectrode and sucrose-gap voltage clamp techniques. When applied externally at a concentration of 0.1 microM or higher, the falling phase of the action potential was prolonged markedly. At concentrations over 0.3 microM, GPT gradually depolarized the mem...
متن کاملStudies of the cardiac-like action potential in crayfish giant axons induced by platinized tungsten metal electrodes.
A lightly platinized tungsten (Pt-W) wire electrode, axially inserted into a crayfish giant axon, causes the development of cardiac-like action potentials with durations of up to 4 s. The plateau in membrane potential typically occurs within 10 min of the start of action potential elongation. The effect occurs without passing current through the Pt-W electrode and is temporally related to a dra...
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ژورنال
عنوان ژورنال: The Journal of Physiology
سال: 1973
ISSN: 0022-3751
DOI: 10.1113/jphysiol.1973.sp010223