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Relevant bibliographies by topics / Desynchronization under constant light

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Academic literature on the topic 'Desynchronization under constant light'

Author: Grafiati

Published: 28 June 2021

Last updated: 12 February 2022

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Journal articles on the topic "Desynchronization under constant light"

1

Rumanova, Valentina S., Monika Okuliarova, and Michal Zeman. "Differential Effects of Constant Light and Dim Light at Night on the Circadian Control of Metabolism and Behavior." International Journal of Molecular Sciences 21, no. 15 (2020): 5478. http://dx.doi.org/10.3390/ijms21155478.

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The disruption of circadian rhythms by environmental conditions can induce alterations in body homeostasis, from behavior to metabolism. The light:dark cycle is the most reliable environmental agent, which entrains circadian rhythms, although its credibility has decreased because of the extensive use of artificial light at night. Light pollution can compromise performance and health, but underlying mechanisms are not fully understood. The present review assesses the consequences induced by constant light (LL) in comparison with dim light at night (dLAN) on the circadian control of metabolism and behavior in rodents, since such an approach can identify the key mechanisms of chronodisruption. Data suggest that the effects of LL are more pronounced compared to dLAN and are directly related to the light level and duration of exposure. Dim LAN reduces nocturnal melatonin levels, similarly to LL, but the consequences on the rhythms of corticosterone and behavioral traits are not uniform and an improved quantification of the disrupted rhythms is needed. Metabolism is under strong circadian control and its disruption can lead to various pathologies. Moreover, metabolism is not only an output, but some metabolites and peripheral signal molecules can feedback on the circadian clockwork and either stabilize or amplify its desynchronization.

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2

Poulis, J. A., F. Roelfsema, and D. van der Heide. "Circadian urinary excretion rhythms in adrenalectomized rats." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 251, no. 3 (1986): R441—R449. http://dx.doi.org/10.1152/ajpregu.1986.251.3.r441.

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The impact of the adrenal system on urinary rhythms was investigated in adrenalectomized (ADX) rats under various experimental conditions. During a 12:12 light-dark cycle the acrophases were shifted in ADX rats with respect to control rats. Under constant light conditions ADX rats displayed free-running rhythms, similar to those of control rats. The periods were stable in blind rats but not in rats maintained on a constant light cycle. The abrupt change in period, which occurred after approximately 8 days, suggests a stage of internal desynchronization. A 6-h delay in the administration of corticosterone to ADX rats caused a delay shift of the acrophases. A single intraperitoneal injection of corticosterone in blind free-running ADX rats caused delay or advance shifts so that we could construct phase-response curves for the various excretory rhythms. These observations indicate that the adrenals are not essential for the establishment of the urinary rhythms; however, corticosterone influences the phase setting of these rhythms. The site of action is probably the X pacemaker (controlling the body temperature rhythm), although we cannot totally exclude an additional effect on secondary (renal) oscillators.

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3

Guerriero, Maria Luisa, Alexandra Pokhilko, Aurora Piñas Fernández, Karen J. Halliday, Andrew J. Millar, and Jane Hillston. "Stochastic properties of the plant circadian clock." Journal of The Royal Society Interface 9, no. 69 (2011): 744–56. http://dx.doi.org/10.1098/rsif.2011.0378.

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Circadian clocks are gene regulatory networks whose role is to help the organisms to cope with variations in environmental conditions such as the day/night cycle. In this work, we explored the effects of molecular noise in single cells on the behaviour of the circadian clock in the plant model species Arabidopsis thaliana . The computational modelling language Bio-PEPA enabled us to give a stochastic interpretation of an existing deterministic model of the clock, and to easily compare the results obtained via stochastic simulation and via numerical solution of the deterministic model. First, the introduction of stochasticity in the model allowed us to estimate the unknown size of the system. Moreover, stochasticity improved the description of the available experimental data in several light conditions: noise-induced fluctuations yield a faster entrainment of the plant clock under certain photoperiods and are able to explain the experimentally observed dampening of the oscillations in plants under constant light conditions. The model predicts that the desynchronization between noisy oscillations in single cells contributes to the observed damped oscillations at the level of the cell population. Analysis of the phase, period and amplitude distributions under various light conditions demonstrated robust entrainment of the plant clock to light/dark cycles which closely matched the available experimental data.

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4

Yamanaka, Yujiro. "Basic concepts and unique features of human circadian rhythms: implications for human health." Nutrition Reviews 78, Supplement_3 (2020): 91–96. http://dx.doi.org/10.1093/nutrit/nuaa072.

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Abstract Most physiological functions and behaviors exhibit a robust approximately 24-hour rhythmicity (circadian rhythm) in the real world. These rhythms persist under constant conditions, but the period is slightly longer than 24 hours, suggesting that circadian rhythms are endogenously driven by an internal, self-sustained oscillator. In mammals, including humans, the central circadian pacemaker is located in the hypothalamic suprachiasmatic nucleus. The primary zeitgeber for this pacemaker is bright sunlight, but nonphotic time cues also affect circadian rhythms. The human circadian system uniquely exhibits spontaneous internal desynchronization between the sleep-wake cycle and core body temperature rhythm under constant conditions and partial entrainment of the sleep-wake cycle in response to nonphotic time cues. Experimental and clinical studies of human circadian rhythms must take into account these unique features. This review covers the basic concepts and unique features of the human circadian system, the mechanisms underlying phase adjustment of the circadian rhythms by light and nonphotic time cues (eg, physical exercise), and the effects of eating behavior (eg, chewing frequency) on the circadian rhythm of glucose metabolism.

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5

Madrid, J. A., F. J. Sánchez-Vázquez, P. Lax, P. Matas, E. M. Cuenca, and S. Zamora. "Feeding behavior and entrainment limits in the circadian system of the rat." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 275, no. 2 (1998): R372—R383. http://dx.doi.org/10.1152/ajpregu.1998.275.2.r372.

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The entrainment limits of the circadian rhythms of feeding activity were studied in Wistar rats exposed to gradually increasing and decreasing or to static light-dark cycles. In the former, the entrainment limits of feeding behavior were 22 h 10 min and 26 h 40 min. In the latter, the upper limit was higher, because rats under zeitgeber period ( t) length = 27 h ( t27) and t28 met the criteria of entrainment. The lower limit, on the other hand, was not modified because none of the t22 animals showed entrained rhythms and one-half of the t23 rats exhibited two components in their circadian feeding rhythms, one with a period of 23 h and the other free running. This 23-h component reflected not only the masking effect of light-dark cycles but also seemed a true light-entrained component. In well-synchronized animals, food intake seemed to depend more on the number of cycles that the animal experienced than on actual time lived; however, other feeding parameters, such as meal frequency and feeding duration, remained constant when expressed per 24 h, irrespective of the t cycle. These results concerning feeding duration, meal frequency, and food intake revealed that the homeostatic and circadian controls interacted to a degree that depended on the type of variable considered. In conclusion, the entrainment limits appeared much more imprecise than they were previously thought to be, because the circadian system can only be partially synchronized near its entrainment limits. The hypothesis that the rat’s circadian system is composed of multiple oscillators with different intrinsic frequencies and varying capacities for light synchronization would explain the partial desynchronization observed near the entrainment limits.

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6

RAMÍREZ ÁVILA, GONZALO M., JEAN-LUC GUISSET, and JEAN-LOUIS DENEUBOURG. "INFLUENCE OF UNIFORM NOISE ON TWO LIGHT-CONTROLLED OSCILLATORS." International Journal of Bifurcation and Chaos 17, no. 12 (2007): 4453–62. http://dx.doi.org/10.1142/s0218127407020117.

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We study the influence of uniform noise on a system of two light-controlled oscillators (LCOs) under three different configurations: uncoupled, master–slave and mutually coupled LCOs. We find that noise can induce desynchronization via a phase transition-like phenomenon depending on the noise intensity and the characteristics of the LCOs.

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7

Aryal, Uma K., Jana Stöckel, Eric A. Welsh, et al. "Dynamic Proteome Analysis ofCyanothecesp. ATCC 51142 under Constant Light." Journal of Proteome Research 11, no. 2 (2011): 609–19. http://dx.doi.org/10.1021/pr200959x.

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8

Liu, Ji, Klara Pendrak, Cheryl Capehart, Reiko Sugimoto, Gregor F. Schmid, and Richard A. Stone. "Emmetropisation under continuous but non-constant light in chicks." Experimental Eye Research 79, no. 5 (2004): 719–28. http://dx.doi.org/10.1016/j.exer.2004.08.007.

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9

Rosenwasser, Alan M., Walter D. McCulley, Matthew C. Hartmann, Michael C. Fixaris, and John C. Crabbe. "Suppression of voluntary ethanol intake in mice under constant light and constant darkness." Alcohol 83 (March 2020): 37–46. http://dx.doi.org/10.1016/j.alcohol.2019.05.009.

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10

Mizutani, Hiromi, Risa Tamagawa‐Mineoka, Risa Yasuike, Yoichi Minami, Kazuhiro Yagita, and Norito Katoh. "Effects of constant light exposure on allergic and irritant contact dermatitis in mice reared under constant light conditions." Experimental Dermatology 30, no. 5 (2021): 739–44. http://dx.doi.org/10.1111/exd.14308.

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