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Author Aschoff, J.
Title Circadian Activity Pattern with Two Peaks Type Journal Article
Year 1966 Publication Ecology Abbreviated Journal
Volume 47 Issue 4 Pages 657-662
Keywords Ecology
Abstract The 24-hr rhythms of behavior and other physiological functions are based upon an endogenous self-sustained oscillation. This is proven by experiments in which animals, kept in constant conditions, show a freerunning circadian period which deviates to a certain degree from that of the earth's rotation. The 24-hr rhythms of activity are furthermore characterized by typical patterns of which the one with two peaks in one period is most common. Under natural conditions, these two peaks of activity are often closely related to specific stimuli in the environment; e.g. to dawn and dusk. They have therefore been described as being directly caused by the environment. However, one may consider not only the circadian period but also the pattern part of an endogenous system. This hypothesis has been tested in experiments with finches. The results are: 1) Birds kept in artificial light-dark cycles show the same two-peak pattern either in cycles with interposed twilight or in cycles with rectangular changes between light and dark, 2) Under constant conditions, the second peak may disappear; but more often, it either remains or becomes more pronounced tan under conditions of a light-dark cycle. 3) With different levels of constant intensity of illumination, the birds show different circadian periods and different durations of activity; under those conditions, the two peaks keep the same proportional relationship to the activity time regardless of its duration. It is concluded that the basic two-peak pattern of locomotor activity is a persistent property of the circadian oscillating system.
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Call Number LoNNe @ kagoburian @ Serial 711
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Author Aschoff, J.; Knauth, P.; Rutenfranz, J.
Title Biologische Rhythmen, in Psychobiologie Type Journal Article
Year 1988 Publication Grundlagen des Verhaltens, edited by K. Immelmann, K. R. Scherer, C. Vogel and P. Schmoock Abbreviated Journal
Volume Issue Pages 219-256
Keywords Society
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Call Number LoNNe @ kagoburian @ Serial 716
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Author Benot, S.; R. Goberna; R. J. Reiter; S. Garcia-Mauriño; C. Osuna; J. M. Guerrero
Title Physiological levels of melatonin contribute to the antioxidant capacity of human serum Type Journal Article
Year 1999 Publication Journal of Pineal Research Abbreviated Journal
Volume 27 Issue Pages 59-64
Keywords Human Health
Abstract This work evaluates whether physiological concentrations of the pineal secretory product melatonin contribute to the total antioxidant status (TAS) of human serum. Day and nighttime serum samples were collected from healthy volunteers ranging from 2 to 89 years of age and used to measure melatonin and TAS. Results showed that both melatonin and TAS in human serum exhibited 24 hr variations with nocturnal peak values at 01:00 hr. Moreover, exposure of volunteers to light at night resulted in clear decreases of both TAS and melatonin. Furthermore, when melatonin was removed from sera collected at night, the TAS value of the sample was reduced to basal daytime values. In aging studies, it was found that nocturnal serum values of TAS and melatonin exhibited maximal values during the first four decades; thereafter, these values decreased as age advanced. In 60-year-old individuals, day/night differences in serum melatonin and TAS levels were clearly diminished, by more than 80%, with these differences being completely abolished in older individuals. Our results suggest that melatonin contributes to the total antioxidative capability of human serum. This antioxidant contribution of melatonin is reduced as age advances correlating with the age-related reduction of melatonin.
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Call Number LoNNe @ kagoburian @ Serial 719
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Author Davis, R. L.
Title Light Exposure and Breast Cancer Type Journal Article
Year 1991 Publication Epidemiology Abbreviated Journal
Volume 2 Issue 6 Pages 458
Keywords Human Health
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Call Number LoNNe @ kagoburian @ Serial 735
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Author Earth Observation Group, and National Oceanic and Atmospheric Administration (NOAA)
Title VIIRS Nighttime Lights – 2012, edited, National Geophysical Data Center Type Journal Article
Year 2013 Publication Abbreviated Journal
Volume Issue Pages
Keywords Remote Sensing
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Call Number LoNNe @ kagoburian @ Serial 738
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