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- W1824674162 abstract "The effects of periodically repeated geotropic stimulations (geotropic pulses) on sunflower hypocotyls are studied. The experimental results agree with predictions from a theory for geotropic movements of the hypocotyl. A sunflower hypocotyl performs circumnutations around or across the plumb line with a period of about 2.5 hours. These oscillations can be entrained to periodically repeated geotropic pulses with a period in a region around 2.5 hours. The limits of this “region of entrainment’ for geotropic pulses are studied. In the region of entrainment resonance curves, i.e., the amplitude of the oscillations plotted as a function of the period of the geotropic pulses, are obtained. The phase differences (measured as time differences) between the geotropic pulse rhythms and the resulting oscillations are also studied. Beat phenomena are predicted and recorded outside the region in which the plants can be entrained. The results are discussed in relation to oscillating phenomena of circadian type (i.e., with a period close to 24 hours), and many similarities are pointed out." @default.
- W1824674162 created "2016-06-24" @default.
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- W1824674162 date "1972-02-01" @default.
- W1824674162 modified "2023-09-25" @default.
- W1824674162 title "Entrainment of Geotropic Oscillations in Hypocotyls of Helianthus annuus - An Experimental and Theoretical Investigation. II. Geotropic Movements due to Periodically Repeated Stimulations" @default.
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- W1824674162 doi "https://doi.org/10.1111/j.1399-3054.1972.tb03545.x" @default.
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