Synaptic ribbons in the pineal organ of the goldfish: Circadian rhythmicity and the effects of constant light and constant darkness

1981 ◽  
Vol 215 (3) ◽  
Author(s):  
JohnA. McNulty
Keyword(s):  
Pineal Organ ◽  
Circadian Rhythmicity ◽  
Constant Light ◽  
Constant Darkness ◽  
Synaptic Ribbons

A circadian rhythm in the locomotive behaviour of the giant garden slug Limax maximus

1977 ◽  
Vol 66 (1) ◽  
pp. 47-64
Author(s):  
P. G. Sokolove ◽  
C. M. Beiswanger ◽  
D. J. Prior ◽  
A. Gelperin
Keyword(s):  
Circadian Rhythm ◽  
Locomotor Activity ◽  
Phase Angle ◽  
Circadian Rhythmicity ◽  
Constant Darkness ◽  
Light Cycle ◽  
Circadian Activity ◽  
Locomotor Rhythm ◽  
Activity Peak ◽  
Limax Maximus

The locomotor activity of the garden slug Limax maximus was examined for components of circadian rhythmicity. Behavioural (running wheel) studies clearly demonstrated that the activity satisfies the principal criteria of circadian rhythmicity. In constant darkness at a constant temperature, the locomotor activity freeran with a period of about 24 h (range 23-6-24-6 h). The rhythm was also expressed in constant light with a period for individual slugs that tended to be shorter in LL than in DD. The period of the rhythm was temperature compensated (11–5-21-5 degrees C) with a Q10 approximately equal to 1–00. The locomotor rhythm could be entrained to 24 h LD cycles such that the circadian activity peak occurred during the dark. The phase angle between the onset of activity and lights-off was not fixed, but was a function of the photoperiod of the entraining light cycle.

scholarly journals Restoration of Circadian Rhythmicity in Circadian Clock-Deficient Mice in Constant Light

2006 ◽  
Vol 21 (3) ◽  
pp. 169-176 ◽  
Author(s):  
Diya Abraham ◽  
Robert Dallmann ◽  
Stephan Steinlechner ◽  
Urs Albrecht ◽  
Gregor Eichele ◽  
...  
Keyword(s):  
Circadian Clock ◽  
Circadian Rhythmicity ◽  
Constant Light ◽  
Deficient Mice

Photic Response Parameters of Circadian Rhythms in The Spinifex Hopping Mouse, Notomys alexis.

1996 ◽  
Vol 19 (1) ◽  
pp. 11
Author(s):  
A.J.P. Francis ◽  
G.J. Coleman
Keyword(s):  
Circadian Rhythms ◽  
Phase Relations ◽  
Constant Light ◽  
Constant Darkness ◽  
Biological Clocks ◽  
Circadian Activity ◽  
Activity Rhythms ◽  
Controlled Conditions ◽  
Australian Native Rodent ◽  
Photic Response

Circadian rhythms are generated endogenously by biological clocks or 'pacemakers', which are responsive to significant environmental stimuli termed zeitgebers. Interactions between pacemakers and zeitgebers provide the basis for synchronisation by light-dark (LD) cycles, and the characteristics of each of these elements determines the phase-relations maintained between an animal's circadian activity rhythms and the natural temporal environment. We report here the basic photic response parameters for an Australian native rodent, Notomys alexis. Under controlled conditions of constant darkness or constant light, N. alexis were found to 'free-run', and with periods different from 24 hours. Under LD cycles N. alexis were strictly nocturnal although, compared to other rodents, entrainment to LD cycles was relatively unstable. This may indicate that N. alexis are not strongly dependent on the LD cycle as a zeitgeber.

scholarly journals INFLUENCE OF LIGHT ON THE GROWTH AND MALIGNANCY OF A TRANSPLANTABLE NEOPLASM OF THE RABBIT

1927 ◽  
Vol 45 (4) ◽  
pp. 727-751 ◽  
Author(s):  
Louise Pearce ◽  
Wade H. Brown
Keyword(s):  
Bone Metastases ◽  
Experimental Evidence ◽  
Malignant Disease ◽  
External Factor ◽  
Wave Length ◽  
Continuous Light ◽  
Constant Light ◽  
Constant Darkness ◽  
Special Character

Experiments are reported in which an environment of constant and continuous light with a wave-length of from 3022 to 5790 Ångström units, supplied by mercury arcs in crown glass, and of constant darkness, have influenced the course and character of a malignant disease of rabbits induced by a transplantable neoplasm. Under the influence of constant light the level of malignancy was lower than in control animals living under ordinary conditions of diffused sunlight. Under the influence of constant darkness the level of malignancy was somewhat lower than in control animals but the effect of this environment was modified by the special character of the disease prevailing at this time. The incidence of bone metastases was unusually high, but it was greatly increased in the rabbits kept in constant darkness. These observations furnish experimental evidence in support of the belief that there is a correlation between the external factor of light and the manifestations of an experimental malignant disease.

scholarly journals Suppression of voluntary ethanol intake in mice under constant light and constant darkness

Alcohol ◽  
2020 ◽  
Vol 83 ◽  
pp. 37-46 ◽  
Author(s):  
Alan M. Rosenwasser ◽  
Walter D. McCulley ◽  
Matthew C. Hartmann ◽  
Michael C. Fixaris ◽  
John C. Crabbe
Keyword(s):  
Ethanol Intake ◽  
Constant Light ◽  
Constant Darkness
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