نتایج جستجو برای: cicardian rhythms

تعداد نتایج: 16157  

2008
Joseph O'Rourke Perouz Taslakian Godfried T. Toussaint

Homometric rhythms (chords) are those with the same histogram or multiset of intervals (distances). The purpose of this note is threefold. First, to point out the potential importance of isospectral vertices in a pair of homometric rhythms. Second, to establish a method (“pumping”) for generating an infinite sequence of homometric rhythms that include isospectral vertices. And finally, to intro...

Journal: :Cellular & molecular biology letters 2002
Tuong Ton-That

Biological rhythms such as circadian rhythms, biochemical rhythms and neural oscillators are based on the mathematical model of the theory of harmonic oscillators. These are solutions of certain second-order differential equations. They can also be viewed as spherical harmonics on the circle in the two-dimensional Euclidean space. The spherical harmonics on (n-1)-spheres and, more generally, th...

Journal: :Nature communications 2013
Daisuke Ono Sato Honma Ken-ichi Honma

Cryptochrome (Cry) 1 and Cry2 are regarded as critical components for circadian rhythm generation in mammals. Nevertheless, cultured suprachiasmatic nucleus (SCN) of neonatal Cry double deficient (Cry1(-/-)/Cry2(-/-)) mice exhibit circadian rhythms that damp out in several cycles. Here, by combining bioluminescence imaging of Per1-luc and PER2::LUC with multielectrode recording, we show develop...

2017
Filipa Rijo-Ferreira Joseph S Takahashi Luisa M Figueiredo

Not all daily rhythms are circadian rhythms. The earth’s rotation exposes organisms to rhythmic changes in the environment, such as light/dark cycles. These environmental changes impose rhythms in organisms; however, many of these rhythms may not persist when in constant conditions. The 24-hour rhythms that do persist in these constant conditions are circadian rhythms. For a process to be defin...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2018
Long Mei Yanyan Fan Xiaohua Lv David K Welsh Cheng Zhan Eric Erquan Zhang

Endogenous circadian clocks control 24-h physiological and behavioral rhythms in mammals. Here, we report a real-time in vivo fluorescence recording system that enables long-term monitoring of circadian rhythms in the brains of freely moving mice. With a designed reporter of circadian clock gene expression, we tracked robust Cry1 transcription reporter rhythms in the suprachiasmatic nucleus (SC...

Journal: :Acta neurobiologiae experimentalis 1975
A Rougeul-Buser J J Bouyer P Buser

In normal implanted cats, squirel monkeys and baboons, various types of localized rhythms can be identified in somatic area I and in the visual zone. Their relation to levels of attentiveness, alertness or drowsiness, and their possible correspondence to human EEG activities, wicket or mu rhythms and occipital alpha rhythms is considered. Subcortical recordings tend to show that these rhythms c...

2015
William Bechtel

This paper reviews some of the compelling evidence of disrupted circadian rhythms in individuals with mood disorders (major depressive disorder, seasonal affective disorder, and bipolar disorder) and that treatments such as bright light, designed to alter circadian rhythms, are effective in treating these disorders. Neurotransmitters in brain regions implicated in mood regulation exhibit circad...

Journal: :Annual review of neuroscience 2013
Laura Lee Colgin

The theta rhythm is one of the largest and most sinusoidal activity patterns in the brain. Here I survey progress in the field of theta rhythms research. I present arguments supporting the hypothesis that theta rhythms emerge owing to intrinsic cellular properties yet can be entrained by several theta oscillators throughout the brain. I review behavioral correlates of theta rhythms and consider...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1992
A Sehgal J Price M W Young

Drosophila melanogaster born and reared in constant darkness exhibit circadian locomotor activity rhythms as adults. However, the rhythms of the individual flies composing these populations are not synchronized with one another. This lack of synchrony is evident in populations of flies commencing development at the same time, indicating that a biological clock controlling circadian rhythmicity ...

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