Results 311 to 320 of about 1,109,395 (327)
Some of the next articles are maybe not open access.
Science, 1981
The cell division cycle of both mammalian cells and microorganisms, which apparently has both deterministic and probabilistic features, is a clock of sorts in that the sequence of events that comprise it measures time under a given set of environmental conditions.
Leland N. Edmunds, Kenneth J. Adams
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The cell division cycle of both mammalian cells and microorganisms, which apparently has both deterministic and probabilistic features, is a clock of sorts in that the sequence of events that comprise it measures time under a given set of environmental conditions.
Leland N. Edmunds, Kenneth J. Adams
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Circadian clocks: Not your grandfather’s clock
Science, 2016The last 20 years have seen the rapid evolution of our understanding of the molecular genes and networks that enable almost all forms of life to generate 24-hour—or circadian—rhythms. One finding has been particularly exciting: that the molecular circadian clock resides in almost all of the cells of the body and that the clock regulates the timing of ...
Fred W. Turek, Fred W. Turek
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Melatonin: A Clock‐Output, A Clock‐Input
Journal of Neuroendocrinology, 2003AbstractIn mammals, the circadian system is comprised of three major components: the lateral eyes, the hypothalamic suprachiasmatic nucleus (SCN) and the pineal gland. The SCN harbours the endogenous oscillator that is entrained every day to the ambient lighting conditions via retinal input.
C. von Gall +2 more
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Reviews in American History, 2000 In his first book, Ian R. Bartky examines the history of American observatories during the nineteenth century in order to "assess the significance of time services in the development of American astronomy" (p. 3). He shows that time services provided some of the revenue and much of the raison d'etre for many fledgling observatories.
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IEEE Computer Graphics and Applications, 2005
The Last clock displays a space's history and rhythm. Trails behind its hands paint the clock face with a video feed, creating a mandala of archived time. The Last clock began as an investigation into representations of time. The goal was to use the mutable properties of digital technology, hoping to create something aesthetically pleasing, interesting,
Ross Cooper, Jussi Ängeslevä
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The Last clock displays a space's history and rhythm. Trails behind its hands paint the clock face with a video feed, creating a mandala of archived time. The Last clock began as an investigation into representations of time. The goal was to use the mutable properties of digital technology, hoping to create something aesthetically pleasing, interesting,
Ross Cooper, Jussi Ängeslevä
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Nature Reviews Molecular Cell Biology, 2003
The eukaryotic genome is divided into well-defined DNA regions that are programmed to replicate at different times during S phase. Active genes are generally associated with early replication, whereas inactive genes replicate late. This expression pattern might be facilitated by the differential restructuring of chromatin at the time of replication in ...
Howard Cedar, Alon Goren
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The eukaryotic genome is divided into well-defined DNA regions that are programmed to replicate at different times during S phase. Active genes are generally associated with early replication, whereas inactive genes replicate late. This expression pattern might be facilitated by the differential restructuring of chromatin at the time of replication in ...
Howard Cedar, Alon Goren
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Light Clocks and the Clock Hypothesis
Foundations of Physics, 2013The clock hypothesis of relativity theory equates the proper time experienced by a point particle along a timelike curve with the length of that curve as determined by the metric. Is it possible to prove that particular types of clocks satisfy the clock hypothesis, thus genuinely measure proper time, at least approximately?
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AJN, American Journal of Nursing, 1970
| '~^?~ / Iivt,pitals and nursing homes, and worst of all, by their nursing staffs. :zji |g j, jtiicEnter any nursing home and you will see loudspeakers, intercoms, and television sets everywhere. But ^^ & ^ mt i XM n' ~how many patients have access to a clock and a calendar, particularly if they are bedridden and cannot navigate on their own?
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| '~^?~ / Iivt,pitals and nursing homes, and worst of all, by their nursing staffs. :zji |g j, jtiicEnter any nursing home and you will see loudspeakers, intercoms, and television sets everywhere. But ^^ & ^ mt i XM n' ~how many patients have access to a clock and a calendar, particularly if they are bedridden and cannot navigate on their own?
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Composite clock including a Cs clock, a H-maser clock and a VCO.
2009 IEEE International Frequency Control Symposium Joint with the 22nd European Frequency and Time forum, 2009We present the project of a composite clock, that will combine a cesium standard, a hydrogen maser standard, and a voltage controlled oscillator in order to provide an output signal that would combine the respective quality of each of the component clocks, the long-term stability for the Cs clock, the mid-term stability for the H-maser and the the ...
P.M. Mbaye +3 more
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Science, 1999
It is well known that as we age, we need fewer hours of sleep and wake up much earlier in the morning. This change has been attributed to a shortening of the period of the human circadian pacemaker. However, Robert Moore explains in a Perspective that new findings ( Czeisler et al .) demonstrate that it is not the pacemaker itself ...
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It is well known that as we age, we need fewer hours of sleep and wake up much earlier in the morning. This change has been attributed to a shortening of the period of the human circadian pacemaker. However, Robert Moore explains in a Perspective that new findings ( Czeisler et al .) demonstrate that it is not the pacemaker itself ...
openaire +3 more sources