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Evolution of precise circadian rhythms in fruit fly Drosophila melanogaster populations selected for adult emergence in a narrow window of time

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dc.contributor.advisor Sharma, Vijay Kumar en_US
dc.contributor.author Nisha, N.K. en_US
dc.date.accessioned 2013-07-28T13:05:32Z en_US
dc.date.available 2013-07-28T13:05:32Z en_US
dc.date.issued 2012 en_US
dc.identifier.citation Nisha, N.K. 2012, Evolution of precise circadian rhythms in fruit fly Drosophila melanogaster populations selected for adult emergence in a narrow window of time, Ph.D thesis, Jawaharlal Nehru Centre for Advanced Scientific Research, Bengaluru en_US
dc.identifier.uri https://libjncir.jncasr.ac.in/xmlui/10572/1356 en_US
dc.description Open Access en_US
dc.description.abstract Organisms ranging from bacteria to mammals exhibit daily rhythms in various behavioural and physiological processes. These 24-hr rhythms are not mere passive responses to environmental cycles because they have been found to persist even under constant laboratory conditions, with near 24-hr period (from „circa‟ - about, „dies‟ - a day; hence circadian), which suggests the presence of endogenous rhythm generating systems (Dunlap et al., 2004). Endogenous, near 24-hr rhythms match their period and maintain a stable phase-relationship with daily environmental cycles through a process known as „entrainment‟, using environmental time-cues (zeitgebers) such as light, temperature, humidity, food availability, and social interaction cycles (Dunlap et al., 2004; Sharma and Chandrashekaran, 2005). The period of these rhythms is largely protected from changes in ambient conditions such as temperature, nutrition and pH, within physiological range, thus giving it a compensatory ability that allows organisms to maintain their rhythmic functions stably in the face of environmental fluctuations. It is thus believed that the ability of circadian timing systems to achieve temporal organization in behaviour and physiology has evolved as an adaptation to daily environmental changes arising due to the rotation of earth about its own axis (Pittendrigh, 1993; Sharma, 2003a; Dunlap et al., 2004). Further, it is believed that circadian clocks confer adaptive benefit to living organisms by timing their behavioural and physiological processes to appropriate time of the day so as to maintain coordination between internal rhythms and cyclic external environment (Pittendrigh, 1993; Sharma and Joshi, 2002; Sharma, 2003a; Dunlap et al., 2004).
dc.language.iso English en_US
dc.publisher Jawaharlal Nehru Centre for Advanced Scientific Research en_US
dc.rights © 2012 JNCASR en_US
dc.subject Drosophila melanogaster en_US
dc.subject Circadian rhythms en_US
dc.title Evolution of precise circadian rhythms in fruit fly Drosophila melanogaster populations selected for adult emergence in a narrow window of time en_US
dc.type Thesis en_US
dc.type.qualificationlevel Doctoral en_US
dc.type.qualificationname Ph.D. en_US
dc.publisher.department Evolutionary and Organismal Biology Unit en_US


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