The Activity Coefficient of Sodium in Striated Muscle Fibers

The 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...

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

Voltage Clamp Experiments in Striated Muscle Fibers

1. Membrane currents during step depolarizations were determined by a method in which three electrodes were inserted near the end of a fibre in the frog's sartorius muscle. The theoretical basis and limitations of the method are discussed.2. Measurements of the membrane capacity (C(M)) and resting resistance (R(M)) derived from the current during a step change in membrane potential are consiste...

Light Diffraction by Single Striated Muscle Fibers

comparison of catalytic activity of heteropoly compounds in the synthesis of bis(indolyl)alkanes.

heteropoly acids (hpa) and their salts have advantages as catalysts which make them both economically and environmentally attractive, strong br?nsted acidity, exhibiting fast reversible multi-electron redox transformations under rather mild conditions, very high solubility in polar solvents, fairly high thermal stability in the solid states, and efficient oxidizing ability, so that they are imp...