| | 1 | Author
| H. Ubert Felle, Hinrich Liihring, Friedrich-W Ilhelm Bentrup | Requires cookie* | | | Title
| Serine Transport and Membrane Depolarization in the Liverwort Riccia fluitans  | | | | Abstract
| The plasmalemma of thallus cells o f the aquatic liverwort, R icciaßuitans, is reversibly depolar ized by L-and D-serine. At 0.1 mM K + in the medium, the depolarization saturates at 50 mV; half-maximal depolarization occurs at 13 hm L-serine and 30 ^m D-serine, respectively. Uptake of 14C-labelled L-serine depends upon the K + concentration and is sensitive to the membrane potential as indicated by its reduction through 1 m M sodium cyanide. We propose that serine binds to and is transported by an electrogenic carrier. However, an interaction of serine with K + channels o f the membrane seems also possible. | | | |
Reference
| Z. Naturforsch. 34c, 1222—1223 (1979); received September 10 1979 | | | |
Published
| 1979 | | | |
Keywords
| Serine, Membrane Potential, Electrogenic Carrier, Riccia | | | |
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| default:Reihe_C/34/ZNC-1979-34c-1222.pdf | | | | Identifier
| ZNC-1979-34c-1222 | | | | Volume
| 34 | |
| 2 | Author
| K. Urt Schefczik, Wilhelm Simonis | Requires cookie* | | | Title
| Action of Lindane on the Current-Voltage Relationship in the Plasma Membrane of Elodea under Passive Conditions | | | | Abstract
| Side effects of the chlorinated hydrocarbon insecticide Lindane on the plasma membrane of the submerged macrophytic fresh-water plant Elodea densa were studied. Single glass microelectrodes were inserted into single cells and membrane potential, membrane resistance and electrode resistance were recorded using a new designed electrophysiological monitoring system ("ELM 2"). The current-voltage relationship in the plasma membrane of Elodea cells under passive conditions is nearly linear for relaxing current pulses up to 10—8 amperes. Lindane treatment, produced first (3.5 hours) a strong nonlinearity in current-voltage relationship with increased membrane resistance for inward current flow, and later (24.5 hours) an increased membrane resistance both for inward and outward current flow. It is discussed that the earlier reported lowering of the potassium selectivity in the plasma membrane of Elodea after Lindane treatment will be the reason for the alterations of current-voltage relationship. | | | |
Reference
| Z. Naturforsch. 34c, 1072—1074 (1979); received June 5 1979 | | | |
Published
| 1979 | | | |
Keywords
| Side Effects of Lindane, Elodea densa Plasma Membrane, Current-Voltage Relationship, Membrane Potential, Ionic Relations | | | |
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| default:Reihe_C/34/ZNC-1979-34c-1072.pdf | | | | Identifier
| ZNC-1979-34c-1072 | | | | Volume
| 34 | |
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