Oviposition rhythm inDrosophila melanogaster and its alteration by a change in the photoperiodicity

Résumé La mesure toutes les 3, 6, 12 ou 24 h, sous deux photopériodicités distinctes, de la ponte journalière deDrosophila melanogaster a montré que la ponte présente un cycle journalier bien marqué et que celui-ci peut-être modifié par un changement de la photopériodicité.     

Parenteral feeding abolishes the circadian adrenocortical rhythm in rats

Summary The circadian rhythm of the blood corticosterone level disappeared in rats that had been given a liquid diet i.v. during a resticted time of day for 10 days, suggesting an important role of the oro-gastrointestinal tract in formation of the rhythm.     

Phase-shift and memorization of the circadian rhythm of transpiration ofTamarix aphylla

Summary The control of the circadian rhythm of transpiration inTamarix aphylla seems to include two distinct components: an externally induced one, that is initiated by the light on signal, and an endogenous clock, whose memorization of the period length is independent of the instant environmental signal.This investigation was carried out at the Tel Aviv University and supported by the MINERVA foundation and by the DFG.     

Induction by sodium dodecylsulfate of the circadian rhythm of conidiation inNeurospora crassa

Cellular and Molecular Life Sciences - The circadian rhythm of conidiation expressed by the mutantband ofNeurospora crassa can also be induced in the wild strain by Na-dodecylsulfate. This...     

Altered circadian rhythm of catecholamines in patients with apallic syndrome

Summary Circadian rhythms of catecholamines were investigated in 4 healthy subjects and in 6 patients suffering from an apallic syndrome. The clinical picture of this syndrome is characterized by disturbed consciousness (coma vigile), by suspension of the sleeping and waking rhythm, by lack of emotional reactions and by appearance of primitive motor patterns. 5 of the 6 apallic patients showed an abolished rhythmicity compared with the control group. These results were interpreted as an indication that endogenous, centrally controlled processes are the cause of circadian rhythms.Acknowledgments. This study was supported by the Robert-Bosch-Stiftung, Stuttgart. The authors wish to thank P. Schaff of Max Planck-Institute for Psychiatry, Munich, for statistical analysis.     

Further studies on the circadian rhythm in the proliferative activity of mouse intestinal epithelium

Zusammenfassung Im Tagesrhythmus der Proliferationstätigkeit von Darmepithelien wurde in drei verschiedenen Parametern um 02.00 Uhr ein Maximum gefunden. Mögliche Mechanismen werden erörtert.     

Persistence of a physiological circadian rhythm of plasma-free 11-hydroxycorticosteroid levels in totally fasting obese subjects

Zusammenfassung Die physiologische rhythmische Aktivität der Nebennierenrinde ist auch bei adipösen Patienten nachzuweisen. Selbst 16–33tägiges totales (6 Patienten) oder partielles (2 Patienten) Fasten vermag den Tagesrhythmus der Kortisolsekretion nicht zu verändern. Jede Abweichung von der Norm weist daher auf eine Komplikation der Fastenkur hin.