Circadian

... underlies addiction to cocaine, speed, angel dust, herione, morphine, alcohol and tobacco I also found a study trying to link drug addiction the circadian cycle which consistis of both positive and negative feedback. Im leaning towards the first theory though.

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... is not in perfect syncrony with the outside world. The plant has it's own bioritm, which is not exactly 24 hours. So put in complete darkness, the circadian rythm of the plant is still keeping perfect time, but it may run, for example, at 26 hours/cycle. Keeping the plant in light adjusts the cycle ...

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We know nyctinasty is circadian. The endogenous rhytm is reinforced by the regular exposure to daylight. But my textbook says nyctinasty still persists when the plants are put in total darkness for 24 hours. Isn't that contradictory?

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... (lower action rate due to photons higher energy) *The blue light receptors do a variety of the following: mediate blue light-induced phototropism (circadian rhythms), chloroplast re-localization, opening of the stomatal aperture and stimulates proton pumps that drive protons out of the cells which ...

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... are known: cryptocrome and phototropin. A novel gene family has been discovered, that appears to code for a blue light receptor involved in circadian rithms. The protein has been termed ZEITLUPE protein. Here is the paper: HERE (edited to make lines shorter :))

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