Disruption of circadian rhythm of tissue respiration inChanna striatus by Metasystox®

Summary Oxygen consumption of gill, brain and muscle tissues ofChanna striatus exhibits a clearcut circadian rhythm with a maximum uptake at 18.00 h. Metasystox exposure decreased the oxygen consumption of all tissues. Maximum reduction is noted in gill followed by brain and muscle. The peak period of oxygen consumption is also eliminated in the pesticide-treated fish.Acknowledgments. Prof. G. Sundara Rajulu is thanked for suggestions and UGC for financial assistance.     

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...     

On the genetics of a circadian rhythm inDrosophila

Zusammenfassung Das tagesperiodische Muster des Sauerstoffverbrauches von Drosophilamutanten weist mehr oder weniger grosse Unterschiede zwischen den Geschlechtern auf: von zwei Maxima ist das abendliche bei den Weibchen stärker ausgeprägt als bei den Männchen, bei denen das Morgenmaximum relativ höher ist. Aus Versuchen mit Superweibchen und Intersexen sowie aus Kreuzungsexperimenten scheint hervorzugehen, dass das Verhältnis vonX-Chromosomen zu Autosomen bei der Ausprägung der beiden Maxima eine Rolle spielt.     

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.     

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.     

Persisting circadian rhythm in hepatic glycogen of mice during inanition and dehydration

Zusammenfassung Eine Circadianrhythmik des Mäuseleberglycogens lässt sich durch Standardisierung anderer biologischer Frequenzen und «Lärm» isolieren. Dies gelingt auch nach Entzug von Futter oder Futter und Wasser. Persistente Rhythmen mit grosser Amplitude kennzeichnen eine Reihe physiologischer Funktionen nach Futter- und Flüssigkeitsentzug und können als Chossatphänomene bezeichnet werden.

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Work supported by the Elsa U. Pardee Foundation, the National Aeronautics and Space Administration of the USA (NsG-517) and the US Public Health Service (5-K6-GM-13).     

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.     

Seasonal changes of circadian pattern in human rectal temperature rhythm under semi-natural conditions

A phase delay of the circadian rectal temperature rhythm existed in three human subjects leading normal lives under semi-natural conditions: the rectal temperature began to increase later in summer than in the other three seasons.