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Entrainment Properties of the Locomotor Activity Rhythm of Drosophila melanogaster Under Different Photoperiodic Regimens

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dc.contributor.author Kumara, Shailesh
dc.contributor.author Sharma, Vijay Kumar
dc.date.accessioned 2012-01-20T11:02:27Z
dc.date.available 2012-01-20T11:02:27Z
dc.date.issued 2004-10
dc.identifier 0929-1016 en_US
dc.identifier.citation Biological Rhythm Research 35(4-5), 377-388 (2004) en_US
dc.identifier.uri https://libjncir.jncasr.ac.in/xmlui/10572/226
dc.description Restricted Access en_US
dc.description.abstract In this paper we report the results of an experiment to assess how closely repeated brief light pulses (LPs) mimic the effects of 12:12 h light/dark (LD) cycles (PPc). The locomotor activity rhythm of individual fruit flies from a laboratory population of Drosophila melanogaster was monitored under four different photoperiodic regimens, created using 12 h of light and 12 h of darkness or brief light pulses (LPs). The phase relationship (W) and the stability (precision) of the locomotor activity rhythm during entrainment were estimated in order to compare the state of the circadian clocks under the four different photoperiodic regimens. The flies (n = 72) were subjected to four different LD cycles: (i) 12 h of light and 12 h of darkness (complete photoperiod, PPc); (ii) a single brief LP of 15 min duration presented close to the onset of activity (SLP-1); (iii) a single brief LP of 15 min duration administered close to the offset of activity (SLP-2); and (iv) two brief LPs administered 12 h apart (skeleton photoperiod, PI's). The locomotor activity rhythm of the flies was first monitored under constant darkness (1313) for about 10 days and then under the four different photoperiodic regimens for about 10 days, and finally in DD for the remainder of the experiment. The W of the locomotor activity rhythm and its precision under PPc and PPs did not differ significantly, but they were significantly different from the SLP-1 and SLP-2 conditions. The results provide interesting insights into photoentraiment mechanisms of circadian clocks in D. melanogaster, and suggest that skeleton photoperiods, but not single brief LPs, mimic the actions of complete photoperiods. en_US
dc.description.uri http://dx.doi.org/10.1080/0929-1010400000608 en_US
dc.language.iso en en_US
dc.publisher Taylor & Francis Ltd en_US
dc.rights © 2004 Taylor & Francis Ltd en_US
dc.subject Drosophila en_US
dc.subject locomotor activity en_US
dc.subject photoperiod en_US
dc.subject entrainment en_US
dc.subject phase relationship en_US
dc.subject precision en_US
dc.subject Mouse Mus-Booduga en_US
dc.subject Period en_US
dc.subject Light en_US
dc.subject Clocks en_US
dc.title Entrainment Properties of the Locomotor Activity Rhythm of Drosophila melanogaster Under Different Photoperiodic Regimens en_US
dc.type Article en_US


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