Abstract
FIFTEEN years of research on the hormonal control of insect circadian rhythms has been founded on the original report that rhythms could be transmitted in the blood between para-biosed cockroaches1. The interpretation of this experiment has been questioned, however, for the following reasons, (a) No control parabioses were performed using animals with unconnected haemocoels2. (b) The lower (recipient) animal was supposedly made arrhythmic by keeping it in constant light (LL), whereas it is now known that cockroaches can remain rhythmic for weeks in LL3 and that such rhythms may not necessarily be apparent in the locomotor activity4, (c) No cognizance was taken of the phase of the recipient animal, which may therefore have been close to that of the donor5. (d) The recipient animal was intact and therefore in possession of a complete neuro-endocrine system whose clock may simply have been re-started by the shock of the operation6.
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.
