ELECTROOSMOSIS IN NITELLA
نویسندگان
چکیده
منابع مشابه
Electroosmosis in Nitella
The role of electroosmosis was studied directly in Nitella. The cells were mounted in a water-tight barrier between two chambers containing reversible electrodes for the application of potentials, and fitted with calibrated capillaries to measure water movement. No water movement was found when small existing bioelectric potentials were short-circuited through an external connection, nor when e...
متن کاملPotassium transference in Nitella
Transmembrane movements of K+ and Cl- were studied under a variety of experimental conditions. Potassium was found to carry more than 50% of an externally applied inward positive current. The increase in K+ influx was much greater than that predicted by the purely passive model. The increase in Cl- efflux accounted for less than 10% of the applied current, in agreement with the value predicted ...
متن کاملChemical Restoration in Nitella
Cells of Nitella exposed to distilled water lose their ability to produce action currents and to distinguish electrically between sodium and potassium. This ability was quickly restored by exposure to blood plasma deprived of calcium. Human blood and that of the cat, calf, and sheep gave essentially the same results. The active agents appear to be organic substances.
متن کاملAction Current in Nitella
In the first paper of this series the general features of the action curve of Nitella were interpreted as due to the movement of potassium ions accompanied by an increase in permeabili ty. Can this idea explain the variations which the action curve exhibits? For tbds purpose we may consider the successive movements. We may begin with a fairly typical action curve I such as is shown in Fig. 1. T...
متن کاملPacemakers in Nitella
A series of negative variations passing along the cell may reach a region where only every other variation registers. This condition may be temporary. It would seem to depend on a local change in the refractory period.
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ژورنال
عنوان ژورنال: Journal of General Physiology
سال: 1957
ISSN: 1540-7748,0022-1295
DOI: 10.1085/jgp.41.2.383