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4 resultados
Electrical evidence for rhythmic changes in the cotransport of sucrose and hydrogen ions in Samanea pulvini.
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Measurements with microelectrodes implanted into Samanea saman (Jacq.) Merrill leaf pulvini showed that membrane potentials were rhythmically sensitive to the application of sucrose. The magnitude of the electrical depolarizations induced by sucrose were dependent on the concentration of H(+) in the
Circadian rhythmicity in excised samanea pulvini: I. Sucrose-white light interactions.
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The rhythmic movement of excised Samanea saman pulvini incubated in H(2)O or 50 mm sucrose was monitored during extended periods of white light (cool white fluorescent, 2,000 ft-c), darkness, or alternating white light (16 hr) and darkness (8 hr). In continuous white light, the rhythm damps at an
Circadian Rhythmicity in Excised Samanea Pulvini: II. Resetting the Clock by Phytochrome Conversion.
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Excised Samanea saman pulvini were incubated in H(2)O or 50 mm sucrose in darkness for 100 to 152 hours except for brief exposures to red or far red light, and angles of opening measured periodically. When pulvini are incubated in H(2)O, the rhythm damps in the open position after two to three
A circadian rhythm in oxygen uptake by samanea pulvini.
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The rate of O(2) uptake by excised Samanea pulvini oscillates with a circadian rhythm during 52 hours of darkness. Rates of respiration increase during pulvinar opening and decrease prior to and during closure, consistent with the concept that opening requires a greater expenditure of energy.
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