• M K Chandrashekaran

      Articles written in Proceedings – Animal Sciences

    • Mother mouse sets the circadian clock of pups

      N Viswanathan M K Chandrashekaran

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      We report here the ontogeny of a circadian clock of the field mouseMus booduga expressing itself 16 days after parturition in the locomotory activity of neonate pups removed from the mother and held in continuous darkness ever since birth. Locomotion is a ‘complex’ activity serving such functions as foraging, exploration, and territoriality. Since these functions are not conventionally associated with neonate and altricial animals, it is of interest that this ability has such an early circadian origin. A backward extrapolation of the pups rhythm and the rhythm of the mother strongly implicate maternal synchronization. The period of the circadian rhythm of the pups shortens with age, from birth up to six months.

    • TheDrosophila circadian clock

      M K Chandrashekaran

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      The circadian rhythm in the process of eclosion of the fruitflyDrosophila is the best investigated with regards to properties such as entrainment, freerun and phase shifts. The system has been the basis of an important coupled oscillator model, several hypotheses, landmark papers and a monograph. ThePRC for this rhythm has been extensively used in experiments designed to test the kinetics of the basic clock. The singularity point, signifying a stimulus that can ’stop’ the clock, was also predicted and discovered in this rhythm. Fittingly the first clock mutant was also discovered inDrosophila.

    • Communication and synchronization of circadian rhythms in insectivorous bats

      G Marimuthu M K Chandrashekaran

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      There is communication and social synchronization of the circadian rhythm in the flight activity of the microchiropteran cave-dwelling batHipposideros speoris. Thus captive bats surrounded by free-flying conspecifics synchronize their activity to the colony activity. The circadian rhythm of a solitary bat in a solitary cave freeruns. Even the rhythm of an ‘alien’ bat (Taphozous nudiventris kachhensis) held captive in the hipposiderid bat cave freeruns. But the rhythms of a closely-related species,Hipposideros fulvus partially entrain to social cues fromHipposideros speoris. Social synchronization of circadian rhythms in bats may be species-specific. This synchronization is abolished when continuous light of 10–20 lux is shone inside the natural cave.

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