Intracellular Sodium Concentration and Activity Coefficient in Single Barnacle Muscle Fibers
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Intracellular Sodium Concentration and Activity Coefficient in Single Barnacle Muscle Fibers
Dear Sir: The comments on my paper (Sodium and potassium fluxes in isolated barnacle muscle fibers. referred to me for reply. At issue is the extent to which the extracellular sodium present in the surface invaginations of single barnacle muscle fibers can make the intracellular activity
متن کاملThe Intracellular Concentration and Activity of Sodium in Giant Barnacle Muscle Fibers
Dear Sir: The existence of sodium binding or compartmentalization in single muscle fibers from giant barnacles was the basis for two recent letters in this Journal (McLaughlin, 1968; Brinley, 1968 b). Evidence for sodium binding from this laboratory is criticized by Brinley (1968 a, see Discussion) because our analytic value for total internal sodium concentration is higher than values obtained...
متن کاملThe Activity Coefficient of Sodium in Striated Muscle Fibers
Dear Sir: The statement by Brinley (1968) that for striated muscle fibers from the giant barnacle " . . . one can calculate an activity coefficient for sarcoplasmic sodium of ca. 0.5-0.6 which is not greatly different from what one might expect from a mixed salt solution having the composition of the sarcoplasm (0.65-0.75)" requires some comment. This calculation was made by dividing the averag...
متن کاملSodium and Potassium Fluxes in Isolated Barnacle Muscle Fibers
Sodium and potassium influxes and outfluxes have been studied in single isolated muscle fibers from the giant barnacle both by microinjection and by external loading. The sodium influxes and outfluxes were 49 and 39 pmoles /cm(2)-sec (temperature = 15-16 degrees C) respectively. The potassium influxes and outfluxes were 28 and 60 pmoles/cm(2)-sec (temperature = 13-16 degrees C) respectively. Re...
متن کاملProperties of sodium pumps in internally perfused barnacle muscle fibers
To study the properties of the Na extrusion mechanism, giant muscle fibers from barnacle (Balanus nubilus) were internally perfused with solutions containing tracer 22Na. In fibers perfused with solutions containing adenosine 5'-triphosphate (ATP) and 30 mM Na, the Na efflux into 10 mM K seawater was approximately 25-30 pmol/cm2.s; 70% of this efflux was blocked by 50-100 microM ouabain, and ap...
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ژورنال
عنوان ژورنال: Journal of General Physiology
سال: 1968
ISSN: 1540-7748,0022-1295
DOI: 10.1085/jgp.52.6.984