Electrical Properties OfValonia Ventricosa

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nucleate cells, such as Halicyslis, Nitella, and Valonia (see Marsh 9 for re- ports on V. ventricosa). In these cells, both the optical and electrical paths are much simplified, with the photosynthetically active chloroplasts very close to the electrically active cell surfaces, and the latter accessible to con-

Electrical Properties of the Plasmalemma and Tonoplast in

Electrical Properties of the Plasmalemma and Tonoplast in Valonia ventricosa 2 Received for publication May 19, 1980 and in revised form August 1, 1980 ROBERT F. DAVIS Department of Botany, Rutgers University, Newark, New Jersey 01702 ABSTRACT Studies were made on the electric potentials of the plasmalemma (Eco)


v On the Changes in Histological Structure and Electrical Response of the Cochlea of the Cat following Section of the VIHth Nerve. By D. W. Ashcroft, C. S. Hallpike and A. F. Rawdon-Smith. Communicated by H. Hartridge, F.R.S. (Plates 7-12) A Contribution to the Comparative Biochemistry of Muscular and Electrical Tissues.

Transport Systems of Ventricaria ventricosa: Asymmetry of the

Valonia and its sister genus Ventricaria have long been objects of study for their transport properties, particularly the response of transport systems to osmotic stress required

Ion Fluxes and Short-Circuit Current in Internally Perfused

by the method of Ussing and Zerahn (43). Finally, the ionic and electrical properties of perfused and normal cells of Valonia are compared. METHODS Culture Methods Valonia ventricosa, 0.8-1.5 cm diameter, were shipped by air from Puerto Rico. The cells were kept in artificial seawater (Utility Chemical Co.,

Sodium, Potassium, and Chloride Transport and Membrane

I will show that the ionic and electrical properties of Valonia ventricosa differ in several respects from those of other plant cells. The high salt content of the vacuole is produced by an inward transport of Na' and especially K* at the tono-plast, whereas Cl- uptake into the vacuole appears to be a passive process. The

Turgor pressure changes trigger characteristic changes in the

pressure and about the individual electrical properties of the two membranes of V. utricularis or V. ventricosa. Per-turbation of pressure equilibrium results in a biphasic expo-nential response of turgor pressure. The first turgor pressure relaxation is almost exclusively due to water flow into or out of the cell (Zimmermann & Steudle 1974).

The Structure and Possible Function of the Vacuole

3. STRUCTURE AND POSSIBLE FUNCTION OF THE VACUOLE 41 budded off, as vesicles, from the Golgi complex and subsequently growing and coalescing to produce the final large central vacuole (Marinos, 1963).