Abstract：
:The light preferences of fruit flies were tested by 2 different means. First, flies were allowed to choose between different illuminations, and their favorite resting, grooming, and feeding places were determined with an infrared-sensitive camera. Second, the activity levels of the animals during their main daily activity period were determined photoelectrically (via infrared light beams) under different light intensities. Both methods revealed that the flies prefer dim light. They rested, groomed, and fed preferentially in places with a light intensity between 5 and 10 lux, and they showed the highest activity level when the light intensity during the day was kept at 10 lux. Furthermore, when dawn and dusk were simulated by logarithmically increasing/decreasing the light intensity during a 1.5-h interval, the flies' activity maxima occurred at about 7.5 lux during early dawn and late dusk. The results suggest that fruit flies time their clocks by early dawn and late dusk and avoid bright light during the day.
journal_name
J Biol Rhythmsjournal_title
Journal of biological rhythmsauthors
Rieger D,Fraunholz C,Popp J,Bichler D,Dittmann R,Helfrich-Förster Cdoi
10.1177/0748730407306198subject
Has Abstractpub_date
2007-10-01 00:00:00pages
387-99issue
5eissn
0748-7304issn
1552-4531pii
22/5/387journal_volume
22pub_type
杂志文章abstract：:The aim of this study was to replicate and extend previous work in which the authors observed lower, shorter, and advanced nocturnal melatonin secretion patterns in premenstrually depressed patients compared to those in healthy control women. The authors also sought to test the hypothesis that the therapeutic effect o...
journal_title：Journal of biological rhythms
pub_type： 临床试验,杂志文章,随机对照试验
doi：10.1177/074873049701200107
更新日期：1997-02-01 00:00:00
abstract：:The human circadian timing system has previously been shown to free run with a period slightly longer than 24 h in subjects living in the laboratory under conditions of forced desynchrony. In forced desynchrony, subjects are shielded from bright light and periodic time cues and are required to live on a day length out...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/074873099129000597
更新日期：1999-06-01 00:00:00
abstract：:Despite the omnipresence of artificial and natural light exposure, there exists little guidance in the United States and elsewhere on light exposure in terms of timing, intensity, spectrum, and other light characteristics known to affect human health, performance, and well-being; in parallel, there is little informati...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730418789506
更新日期：2018-10-01 00:00:00
abstract：:The classical power spectrum, computed in the frequency domain, outranks traditionally used periodograms derived in the time domain (such as the chi2 periodogram) regarding the search for biological rhythms. Unfortunately, classical power spectral analysis is not possible with unequally spaced data (e.g., time series ...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/074873099129000984
更新日期：1999-12-01 00:00:00
abstract：:Hibernating animals have been a successful model system for elucidating fundamental properties of many physiological systems. Over the past 50 years, a diverse literature has emerged on the role of the circadian system in control and expression of winter torpor in several orders of birds and mammals. This body of rese...
journal_title：Journal of biological rhythms
pub_type： 杂志文章,评审
doi：10.1177/0748730403254971
更新日期：2003-08-01 00:00:00
abstract：:An intricate transcription-translation feedback loop (TTFL) governs cellular circadian rhythms in mammals. Here, we report that the zinc finger transcription factor Krüppel-like factor 9 (KLF9) is regulated by this TTFL, it associates in chromatin at the core circadian clock and clock-output genes, and it acts to modu...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730420913205
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abstract：:Most visual system functions, such as opsin gene expression, retinal neural transmission, light perception, and visual sensitivity, display robust day-night rhythms. The rhythms persist in constant lighting conditions, suggesting the involvement of endogenous circadian clocks. While the circadian pacemakers that contr...
journal_title：Journal of biological rhythms
pub_type： 杂志文章,评审
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更新日期：2019-10-01 00:00:00
abstract：:The authors examined spatial working memory in the Morris water maze during the activity and rest periods of Wistar rats. Wheel-running activity was measured continuously as a marker of circadian phase. To minimize possible masking effects on performance, animals were placed in constant dim light the day before testin...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730404265688
更新日期：2004-08-01 00:00:00
abstract：:Nonphotic stimuli can reset and entrain circadian activity rhythms in hamsters and mice, and serotonin is thought to be involved in the phase-resetting effects of these stimuli. In the present study, the authors examined the effect of the serotonin agonist quipazine on circadian activity rhythms in three inbred strain...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/074873099129000524
更新日期：1999-04-01 00:00:00
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journal_title：Journal of biological rhythms
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journal_title：Journal of biological rhythms
pub_type： 杂志文章
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更新日期：2008-08-01 00:00:00
abstract：:Drosophila littoralis is a latitudinally widespread European species of the Drosophila virilis group. The species has ample genetic variation in photoperiodism (adult diapause) and circadian rhythmicity (pupal eclosion rhythm), with adaptive latitudinal clines in both of them. The possible common genetic basis between...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
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journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/074873099129000416
更新日期：1999-02-01 00:00:00
abstract：:Morningness and eveningness preference, an endogenous component of the circadian clock, is characterized by an interindividual difference in circadian phase and requires of humans a specific timing of behavior. The biological rhythms of morning and evening types are consequently phase shifted with fixed socioeconomic ...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/074873001129001764
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abstract：:The pineal organ of the lizard Anolis carolinensis acts as a transducer of photoperiodic information, since light can affect the pineal melatonin rhythm (PMR). The synthesis and secretion of melatonin may be a major mechanism whereby a circadian pacemaker within the pineal can control circadian clocks located elsewher...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
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journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/0748730413476827
更新日期：2013-04-01 00:00:00
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journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/074873040001500206
更新日期：2000-04-01 00:00:00
abstract：:The frequency demultiplication hypothesis (FDH) posits that circannual rhythms are generated from circadian cycles by frequency transformation to the lower-frequency rhythm. To test the FDH, we determined the periods of the circannual body mass and estrous cycles of golden-mantled ground squirrels with circadian locom...
journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/074873048600100402
更新日期：1986-01-01 00:00:00
abstract：:Surgical isolation of the suprachiasmatic nuclei (SCN) within a hypothalamic island is reported to produce loss of circadian rhythmicity. The results have been interpreted to indicate that SCN efferents are necessary for the expression of circadian rhythms. It is not clear, however, whether the loss of circadian rhyth...
journal_title：Journal of biological rhythms
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abstract：:Entrainability of the circadian rhythm of mosquito flight and locomotor activity was investigated by giving a 24-hr temperature cycle (28 degrees C for 16 hr, 23 degrees C for 8 hr) to the free-running rhythm or by shifting the temperature cycle. The phase angle difference between the entrained rhythm and the temperat...
journal_title：Journal of biological rhythms
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journal_title：Journal of biological rhythms
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journal_title：Journal of biological rhythms
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journal_title：Journal of biological rhythms
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abstract：:The mammalian circadian clock is known to be entrained by both a daily light-dark cycle and daily feeding cycle. However, the mechanisms of feeding-induced entrainment are not as fully understood as those of light entrainment. To elucidate the first step of entrainment of the liver clock, we identified the circadian c...
journal_title：Journal of biological rhythms
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更新日期：2011-06-01 00:00:00
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journal_title：Journal of biological rhythms
pub_type： 杂志文章
doi：10.1177/074873048600100205
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abstract：:The mammalian circadian clock in the suprachiasmatic nucleus (SCN) drives and maintains 24-h physiological rhythms, the phases of which are set by the local environmental light-dark cycle. Gastrin-releasing peptide (GRP) communicates photic phase setting signals in the SCN by increasing neurophysiological activity of ...
journal_title：Journal of biological rhythms
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abstract：:Threads of evidence from recent experimentation in retinal morphology, neurochemistry, electrophysiology, and visual perception point toward rhythmic ocular processes that may be integral components of circadian entrainment in mammals. Components of retinal cell biology (rod outer-segment disk shedding, inner-segment ...
journal_title：Journal of biological rhythms
pub_type： 杂志文章,评审
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abstract：:The tau mutation in Syrian hamsters (Mesocricetus auratus) is phenotypically expressed in a period of the circadian rhythm of about 20 h in homozygotes (SS) and about 22 h in heterozygotes (S+). The authors investigate whether this well-defined model for variation in circadian period exhibits associated changes in ene...
journal_title：Journal of biological rhythms
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journal_title：Journal of biological rhythms
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abstract：:The hematologic system performs a number of essential functions, including oxygen transport, the execution of the immune response against tumor cells and invading pathogens, and hemostasis (blood clotting). These roles are performed by erythrocytes (red blood cells), leukocytes (white blood cells), and thrombocytes (p...
journal_title：Journal of biological rhythms
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