نتایج جستجو برای: daytime running light

تعداد نتایج: 485727  

2014
Zhenxing Liu Zhangwu Zhao

Light is a very important regulator of the daily sleep rhythm. Here, we investigate the influence of nocturnal light stimulation on Drosophila sleep. Results showed that total daytime sleep was reduced due to a decrease in daytime sleep episode duration caused by discontinuous light stimulation, but sleep was not strongly impacted at nighttime although the discontinuous light stimulation occurr...

Journal: :American journal of physiology. Regulatory, integrative and comparative physiology 2006
Nana N Takasu Satoko Hashimoto Yujiro Yamanaka Yusuke Tanahashi Ayano Yamazaki Sato Honma Ken-ichi Honma

Effects of two different light intensities during daytime were examined on human circadian rhythms in plasma melatonin, core body temperature, and wrist activity under a fixed sleep schedule. Sleep qualities as indicated by polysomnography and subjective sleepiness were also measured. In the first week, under dim light conditions ( approximately 10 lx), the onset and peak of nocturnal melatonin...

2013
Koyomi Miyazaki Nanako Itoh Sumika Ohyama Koji Kadota Katsutaka Oishi

Psychological stressors prominently affect diurnal rhythms, including locomotor activity, sleep, blood pressure, and body temperature, in humans. Here, we found that a novel continuous stress imposed by the perpetual avoidance of water on a wheel (PAWW) affected several physiological diurnal rhythms in mice. One week of PAWW stress decayed robust circadian locomotor rhythmicity, while locomotor...

Journal: :Journal of Light & Visual Environment 2009

2007
Serguei V Kozlov James W Bogenpohl Maureen P Howell Rachel Wevrick Satchin Panda John B Hogenesch Louis J Muglia Russell N Van Gelder Erik D Herzog Colin L Stewart

Mammalian circadian rhythms of activity are generated within the suprachiasmatic nucleus (SCN). Transcripts from the imprinted, paternally expressed Magel2 gene, which maps to the chromosomal region associated with Prader-Willi Syndrome (PWS), are highly enriched in the SCN. The Magel2 message is circadianly expressed and peaks during the subjective day. Mice deficient in Magel2 expression entr...

2012
Ralph E. Mistlberger Brianne A. Kent Sofina Chan Danica F. Patton Alexander Weinberg Maksim Parfyonov

Anticipation of a daily meal in rats has been conceptualized as a rest-activity rhythm driven by a food-entrained circadian oscillator separate from the pacemaker generating light-dark (LD) entrained rhythms. Rats can also anticipate two daily mealtimes, but whether this involves independently entrained oscillators, one 'continuously consulted' clock, cue-dependent non-circadian interval timing...

Journal: :Journal of biological rhythms 2010
Daan R van der Veen Simon N Archer

A functional knockout of Period3 in mice (mPer3(-/-)) results in a mildly altered circadian phenotype, and mPer3 shows a redundant role within the circadian clock. In this study, the authors reevaluated the Per3(-/ -) behavioral phenotype on a C57Bl/6J background and report altered responses to light. In constant light, free-running activity period was shorter than that of wild-type, whereas in...

Journal: :Journal of biological rhythms 2008
M Comas D G M Beersma R A Hut S Daan

Phase shifting of circadian systems by light has been attributed both to parametric effects on angular velocity elicited by a tonic response to the luminance level and to nonparametric instantaneous shifts induced by a phasic response to the dark-light (D>L) and light-dark (L>D) transitions. Claims of nonparametric responses are partly based on "step-PRCs," that is, phase response curves derive...

ژورنال: Journal of Railway Research 2021
Adoh, Lucky Ugochukwu, Tesfaye , Samuel,

The rail track is one of the most important elements of a railway system. During the passage of trains, the rails are subjected to contact load that comes from the wheels of the train.  The railway track often fails in service due to wear caused by contact fatigue and other wear damage mechanisms that could also limit the life span of the railway infrastructure and railway vehicle. The aim of t...

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