Abstract
A well known 2-oscillator model proposed by Pittendrigh and Bruce (1957) postulates that (1) a light sensitive and temperature compensated A-oscillator (master) and (2) a temperature sensitive and light refractory B-oscillator (slave) underlie, govern and gate the circadian rhythm in the eclosion of Drosophila pseudoobscura. The principal merit of this coupled oscillator model is that it seemed to “explain” the phenomenon of “transients” and at least one of its tenets has found experimental proof (Chandrashekaran, 1967). There has not been any proof for nor any evidence against the existence of a separate B-oscillator. Experiments carried out by me to evoke the responses of the B-oscillator to the exclusion of the A-oscillator in Drosophila pseudoobscura have failed. Temperature pulses and light pulses (regardless of the lighting conditions of the cultures and experiments) always shifted or reset what has been considered the A-oscillator leaving no evidence or clue for the existence or involvement of a separate B-oscillator.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
