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Journal articles on the topic 'Desynchronization under constant light'

Author: Grafiati

Published: 28 June 2021

Last updated: 12 February 2022

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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 a

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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 cor

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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, t

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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

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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 feed

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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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11

Wang, Jianbin, Zhanhao Hu, Zhiming Zhong, et al. "Stressing organic light-emitting diode under constant-brightness driving mode." Organic Electronics 21 (June 2015): 192–97. http://dx.doi.org/10.1016/j.orgel.2015.03.025.

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12

Túnez, Isaac, María del Carmen Muñoz, Montserrat Feijoo, Manuel E. Valdelvira, Juan Rafael Muñoz-Castañeda, and Pedro Montilla. "Melatonin effect on renal oxidative stress under constant light exposure." Cell Biochemistry and Function 21, no. 1 (2002): 35–40. http://dx.doi.org/10.1002/cbf.994.

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13

Túnez, I., M. C. Muñoz, M. Feijoo-López, E. Valdelvira, I. Bujalance-Arenas, and P. Montilla. "Effect of melatonin on hyperlipidemic nephropathy under constant light exposure." Journal of Physiology and Biochemistry 58, no. 2 (2002): 109–14. http://dx.doi.org/10.1007/bf03179846.

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14

Aguzzi, Jacopo, Nicole M. Bullock, and Gianluca Tosini. "Spontaneous internal desynchronization of locomotor activity and body temperature rhythms from plasma melatonin rhythm in rats exposed to constant dim light." Journal of Circadian Rhythms 4 (April 4, 2006): 6. http://dx.doi.org/10.1186/1740-3391-4-6.

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15

Depres-Brummer, P., F. Levi, G. Metzger, and Y. Touitou. "Light-induced suppression of the rat circadian system." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 268, no. 5 (1995): R1111—R1116. http://dx.doi.org/10.1152/ajpregu.1995.268.5.r1111.

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In a constant environment, circadian rhythms persist with slightly altered period lengths. Results of studies with continuous light exposure are less clear, because of short exposure durations and single-variable monitoring. This study sought to characterize properties of the oscillator(s) controlling the rat's circadian system by monitoring both body temperature and locomotor activity. We observed that prolonged exposure of male Sprague-Dawley rats to continuous light (LL) systematically induced complete suppression of body temperature and locomotor activity circadian rhythms and their replac

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16

Amano, Masafumi, Masayuki Iigo, Shoji Kitamura, Noriko Amiya, and Kunio Yamamori. "Changes in melatonin binding sites under artificial light–dark, constant light and constant dark conditions in the masu salmon brain." Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology 144, no. 4 (2006): 509–13. http://dx.doi.org/10.1016/j.cbpa.2006.04.018.

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17

Cambras, Trinitat, John R. Weller, Montserrat Anglès-Pujoràs, et al. "Circadian desynchronization of core body temperature and sleep stages in the rat." Proceedings of the National Academy of Sciences 104, no. 18 (2007): 7634–39. http://dx.doi.org/10.1073/pnas.0702424104.

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Proper functioning of the human circadian timing system is crucial to physical and mental health. Much of what we know about this system is based on experimental protocols that induce the desynchronization of behavioral and physiological rhythms within individual subjects, but the neural (or extraneural) substrates for such desynchronization are unknown. We have developed an animal model of human internal desynchrony in which rats are exposed to artificially short (22-h) light–dark cycles. Under these conditions, locomotor activity, sleep–wake, and slow-wave sleep (SWS) exhibit two rhythms wit

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18

Smrčinová, Miroslava, Preben Graae Sørensen, Július Krempasky, and Peter Ballo. "Chaotic Oscillations in a Chloroplast System Under Constant Illumination." International Journal of Bifurcation and Chaos 08, no. 12 (1998): 2467–70. http://dx.doi.org/10.1142/s0218127498001984.

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We show that nonlinear, aperiodic oscillatory behavior can be observed in a chloroplast system by measuring the absorption of light. This behavior depends on illumination of the system with light which is absorbed by chlorophyll. The oscillations can be stopped by addition of acetone indicating that chemical reactions are involved. These observations confirm the role of photosynthesis. The effect of stirring and the statistics of the oscillating part of the spectrum suggest that the buoyancy of oxygen bubbles formed during photosynthesis is an important art of the mechanism.

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19

Cruz, Adolfo, Francisco J. Padillo, Jose Granados, et al. "Effect of melatonin on cholestatic oxidative stress under constant light exposure." Cell Biochemistry and Function 21, no. 4 (2003): 377–80. http://dx.doi.org/10.1002/cbf.1046.

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20

Gervais, Frank. "Oxygen Productivity of Planktonic Algae under Fluctuating and Constant Light Conditions." International Review of Hydrobiology 96, no. 5 (2011): 622–30. http://dx.doi.org/10.1002/iroh.201111277.

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21

TOIDA, Hiromi, Yoshitaka OMURA, Chieri KUBOTA, and Toyoki KOZAI. "Growth and Development of Tomato Seedlings under Constant Light-dark Period with Random Light Periods." Environment Control in Biology 41, no. 4 (2003): 369–75. http://dx.doi.org/10.2525/ecb1963.41.369.

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22

Moura, Clarissa de Almeida, Jéssica Polyana da Silva Lima, Vanessa Augusta Magalhães Silveira, Mário André Leocadio Miguel, and Ana Carolina Luchiari. "Time place learning and activity profile under constant light and constant dark in zebrafish (Danio rerio)." Behavioural Processes 138 (May 2017): 49–57. http://dx.doi.org/10.1016/j.beproc.2017.02.015.

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23

Proshold, F. I. "Sperm Transfer in Gypsy Moths: Effect of Constant or Cyclic Temperature and Constant Light or Darkness during the Pupal Stage." Journal of Entomological Science 32, no. 3 (1997): 321–31. http://dx.doi.org/10.18474/0749-8004-32.3.321.

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Sperm transfer and fertility of the gypsy moth, Lymantria dispar (L.), held as pupae under constant temperature and 24-h light, 24-h darkness, or a photoperiod of 16:8 (L:D) h were compared with males held in cyclic temperature and 24-h light, 24-h darkness, or a photoperiod of 16:8 (L:D) h. Constant temperature and constant light or darkness severely reduced its ability to transfer sperm. Males held under constant light were more severely affected than males held in darkness, but sperm transfer was not correlated with light intensity (between 80 and 3960 lux). Nearly all males held under cons

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24

Roach, Thomas. "LHCSR3-Type NPQ Prevents Photoinhibition and Slowed Growth under Fluctuating Light in Chlamydomonas reinhardtii." Plants 9, no. 11 (2020): 1604. http://dx.doi.org/10.3390/plants9111604.

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Natural light intensities can rise several orders of magnitude over subsecond time spans, posing a major challenge for photosynthesis. Fluctuating light tolerance in the green alga Chlamydomonas reinhardtii requires alternative electron pathways, but the role of nonphotochemical quenching (NPQ) is not known. Here, fluctuating light (10 min actinic light followed by 10 min darkness) led to significant increase in NPQ/qE-related proteins, LHCSR1 and LHCSR3, relative to constant light of the same subsaturating or saturating intensity. Elevated levels of LHCSR1/3 increased the ability of cells to

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25

Huang, Kuo-Chen. "Effects of Colored Light and Colors of Comparison Stimulus and Their Background on Heaviness of Lifted Weight." Perceptual and Motor Skills 107, no. 2 (2008): 513–22. http://dx.doi.org/10.2466/pms.107.2.513-522.

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The effects of colored light and colors of stimuli and their backgrounds on participants' perceptions that the weight of a stimulus was identical to a standard weight were examined. A total of 23 women and 19 men, Taiwanese college students ages 20 to 23 years ( M = 21.2, SD= 0.8) were randomly divided into three groups, with each assigned to one of three possible colored light conditions. Colored light significantly affected the constant errors between weight perceptions of the comparison and standard stimuli; the perception constant errors under yellow light were significantly less than thos

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26

Kasajima, Shin-ya, Naoto Inoue, Rezwanul Mahmud, Kaori Fujita, and Masakazu Kato. "Effect of Light Quality on Developmental Rate of Wheat under Continuous Light at a Constant Temperature." Plant Production Science 10, no. 3 (2007): 286–91. http://dx.doi.org/10.1626/pps.10.286.

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27

Fortier, François-Xavier, and Sylvain G. Cloutier. "Constant-Stress Accelerated Degradation Life Test of an Organic Light-Emitting Diode Display under Violet Light." Engineering 08, no. 02 (2016): 45–51. http://dx.doi.org/10.4236/eng.2016.82005.

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28

Lubin, Robert T., A. W. Rourke, and Richard L. Saunders. "Influence of Photoperiod on the Number and Ultrastructure of Gill Chloride Cells of the Atlantic Salmon (Salmo salar) before and during Smoltification." Canadian Journal of Fisheries and Aquatic Sciences 48, no. 7 (1991): 1302–7. http://dx.doi.org/10.1139/f91-156.

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Atlantic salmon (Salmo salar) larger than 9 cm held under constant light since October had greater numbers of gill chloride cells in February compared with fish held under simulated natural photoperiod. By April, fish raised under simulated natural photoperiod were able to survive salinity tests, had a threefold increase in Na+/K+ ATPase activity, and had increased chloride cell numbers. These increases and salinity tolerance did not occur in fish raised under constant light. Only fish reared under constant light developed apical pits with large and numerous microvilli.

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29

Rosenberg, Yael, Tirza Doniger, Saki Harii, Frederic Sinniger, and Oren Levy. "Demystifying Circalunar and Diel Rhythmicity in Acropora digitifera under Constant Dim Light." iScience 22 (December 2019): 477–88. http://dx.doi.org/10.1016/j.isci.2019.11.040.

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30

Nojima, Kazuo, Hideo Saito, Kuniaki Otsuka, and Haruo Watanabe. "Circadian rhythm in third generation rats bred under a constant light schedule." Journal of the Autonomic Nervous System 41, no. 3 (1992): 244. http://dx.doi.org/10.1016/0165-1838(92)90101-l.

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31

Shin, C. N., G.-Y. Rhee, and J. Chen. "Phosphate Requirement, Photosynthesis, and Diel Cell Cycle of Scenedesmus obliquas Under Fluctuating Light." Canadian Journal of Fisheries and Aquatic Sciences 44, no. 10 (1987): 1753–58. http://dx.doi.org/10.1139/f87-214.

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The effect of light fluctuation (0.06 Hz) on P requirement, photosynthesis, and the diel cell-division cycle was investigated in Scenedesmus obliquus in a chemostat under a 12 h day: 12 h night cycle. P requirement was much less under oscillating than under constant daylight of the same photon flux density. However, cell chlorophyll a was significantly higher, indicating an increased N requirement. There was little difference in photosynthetic efficiency (the slope of the photosynthesis–light regression) between oscillating and constant light, but photosynthetic capacity was higher in fluctuat

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32

Ramos, Shayenne Elizianne, Luis David Solis Murgas, Monica Rodrigues Ferreira, and Carlos Alberto Mourao Junior. "Learning and Working Memory In Mice Under Different Lighting Conditions." Revista Neurociências 21, no. 3 (2013): 349–55. http://dx.doi.org/10.34024/rnc.2013.v21.8158.

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Objective. This study aimed to investigate the effect of different light/ dark cycles and light intensity during behavioral tests of learning and working memory in Swiss mice. Method. Fifty-seven Swiss mice were kept in a housing room in either a 12:12h light/dark cycle (LD), constant light (LL), or constant darkness (DD). The animals were then tested in Lashley maze and Object recognition task under either 500 or 0 lux illumination, resulting in six treatments (LD-500, LD-0, LL- 500, LL-0, DD-500, and DD-0). Results. There were no significant differences between the conditions of light/dark,

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33

Kujur, Pratibha. "Locomotor activity rhythm of catfish Heteropneustes fossilis are prominently regulated by light-dark cues." South Asian Journal of Experimental Biology 11, no. 2 (2021): 128–35. http://dx.doi.org/10.38150/sajeb.11(2).p128-135.

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It is interesting to explore, the circadian locomotor activity rhythm of dark adapted fishes. Therefore, it is aimed to investigate the circadian locomotor activity rhythm of catfish, Heteropneustes fossilis under different light regi-mens- light-dark condition LD 12:12, constant dark condition DD, constant light LL and dark-light condition DL 12:12 in both male and female. The study was conducted sequentially under LD 12: 12 (LON 0500 and LOFF 1700) and thereafter under the DD, LL and DL each for at least 10-12 consecutive days. The locomotor activity was monitored using Stanford Chronobiolog

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34

Adachi, Akihito A., Atsuko Fujioka, Mamoru Nagano, et al. "Helix-loop-helix Protein Id2 Stabilizes Mammalian Circadian Oscillation Under Constant Light Conditions." Zoological Science 30, no. 12 (2013): 1011–18. http://dx.doi.org/10.2108/zsj.30.1011.

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35

Cambras, T., M. M. Canal, A. Torres, J. Vilaplana, and A. Diez-Noguera. "Manifestation of circadian rhythm under constant light depends on lighting conditions during lactation." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 272, no. 4 (1997): R1039—R1046. http://dx.doi.org/10.1152/ajpregu.1997.272.4.r1039.

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Adult rats transferred to continuous illumination (LL) show a disruption of circadian rhythms, although the mechanisms underlying this effect are not yet well known. In previous experiments, we found that when rats were born and raised under LL they showed an ultradian pattern during the first 10 days after weaning, but afterward they generated a circadian rhythm that was maintained until adulthood. It was not clear whether this evolution was attributable to the influence of the rhythm of the mother or to the effect of constant light. Here, we have studied the motor activity rhythm of young ra

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36

Miyazaki, Yosuke, and Hideharu Numata. "Exhibition of circannual rhythm under constant light in the varied carpet beetleAnthrenus verbasci." Biological Rhythm Research 41, no. 6 (2010): 441–48. http://dx.doi.org/10.1080/09291010903411443.

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37

Namyatov, I. G., and V. I. Babushok. "Critical conditions for explosive decomposition of ozone under UV light of constant intensity." Combustion, Explosion, and Shock Waves 32, no. 3 (1996): 270–75. http://dx.doi.org/10.1007/bf01998455.

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Jang, Y. H., C. Lee, B. G. Yoon, and H. R. Park. "Light-induced defect generation in hydrogenated amorphous silicon under the constant photocurrent conditions." Solid State Communications 82, no. 4 (1992): 283–86. http://dx.doi.org/10.1016/0038-1098(92)90642-m.

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39

Diatroptov, M. E. "Infradian Modulation of Circadian Rhythm in Small Mammals and Birds under Constant Light." Bulletin of Experimental Biology and Medicine 170, no. 6 (2021): 795–98. http://dx.doi.org/10.1007/s10517-021-05157-9.

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40

Cushman, K. E., and T. W. Tibbitts. "125 THE ROLE OF ETHYLENE IN THE DEVELOPMENT OF CONSTANT-LIGHT INJURY OF POTATO." HortScience 29, no. 5 (1994): 446c—446. http://dx.doi.org/10.21273/hortsci.29.5.446c.

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Chlorosis and necrotic spotting develop on expanding leaves of particular cultivars of potato (Solanum tuberosum L.) when grown under constant light and temperature conditions. Plantlets of a constant-light sensitive cultivar, Kennebec, were planted into peat:vermiculite and established at 18C for 10 d under a 12 h light: 12 h dark photoperiod. Plants were then exposed to constant light and sprayed with 1 ml of either 0.5 mM silver thiosulfate (STS), an ethylene-action inhibitor, or water (as a control) every 2 days. Specific `target' leaflets, 5-10 mm in length at the beginning of the constan

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PORKKA-HEISKANEN, T., M. L. LAAKSO, D. STENBERG, M. PEDER, and G. JOHANSSON. "Testosterone elevates pituitary prolactin content of long-term castrated rats under constant but not under periodic light." Acta Physiologica Scandinavica 140, no. 2 (1990): 279–85. http://dx.doi.org/10.1111/j.1748-1716.1990.tb08999.x.

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42

Dörr, Saskia, and Christa Neumeyer. "The Goldfish—A Colour-Constant Animal." Perception 25, no. 2 (1996): 243–50. http://dx.doi.org/10.1068/p250243.

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A series of either thirteen or fifteen coloured test fields with hues from blue through grey to yellow were presented on a black background. Goldfish were trained on a bluish-grey test field by food reward. In the training situation, the setup with the coloured papers was illuminated with white light. In the test situation, the colour of the illumination was changed to blue or yellow. In both test illuminations the goldfish preferred the training field in the same way as under white illumination despite the fact that this test field stimulated the cone types very differently from the training

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43

Hoppe, Clara J. M., Lena‐Maria Holtz, Scarlett Trimborn, and Björn Rost. "Ocean acidification decreases the light‐use efficiency in an A ntarctic diatom under dynamic but not constant light." New Phytologist 207, no. 1 (2015): 159–71. http://dx.doi.org/10.1111/nph.13334.

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44

Yang, Chao-Hui, Chung-Feng Hwang, Jiin-Haur Chuang, et al. "Constant Light Dysregulates Cochlear Circadian Clock and Exacerbates Noise-Induced Hearing Loss." International Journal of Molecular Sciences 21, no. 20 (2020): 7535. http://dx.doi.org/10.3390/ijms21207535.

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Noise-induced hearing loss is one of the major causes of acquired sensorineural hearing loss in modern society. While people with excessive exposure to noise are frequently the population with a lifestyle of irregular circadian rhythms, the effects of circadian dysregulation on the auditory system are still little known. Here, we disturbed the circadian clock in the cochlea of male CBA/CaJ mice by constant light (LL) or constant dark. LL significantly repressed circadian rhythmicity of circadian clock genes Per1, Per2, Rev-erbα, Bmal1, and Clock in the cochlea, whereas the auditory brainstem r

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45

Yue, Li Hong, and Yi Peng Yang. "Study on Light Intensity Attenuation Characteristics of Chlorella Sp. Culture and the Growth of Chlorella Sp. with the Gradient Light Illuminate Culture." Applied Mechanics and Materials 675-677 (October 2014): 86–89. http://dx.doi.org/10.4028/www.scientific.net/amm.675-677.86.

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Based on the photoautotrophic characteristics of the freshwater microalage, light intensity attenuation characteristics in the cell culture system for Chlorella sp. were studied. Micralgae was cultured with a constant and the gradient light illuminate culture conditions, the cell growth of Microlagae was detected respectively, By means of regression analysis, mathematical models of illuminance intensity attenuation are gotten under different culture conditions. Results show algae cell density under gradient light culture conditions is higher than constant light, so the gradient light is more s

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46

Ekiert, Halina, and Ewa Gomółka. "Effect of light on contents of coumarin compounds in shoots of Ruta graveolens L. cultivated in vitro." Acta Societatis Botanicorum Poloniae 68, no. 3 (2014): 197–200. http://dx.doi.org/10.5586/asbp.1999.026.

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Shoots of <em>Ruta graveolens</em> L. (<em>Rutaceae</em>) were cultivated in stationary liquid culture under different light conditions: constant artificial light (900 lx), darkness, constant artificial light (900 ix) following irradiation with UV-C light. The contents of five furanocoumarins: psoralen, bergapten, xanthotoxin, isopimpinellin and imperatorin, as well as biogenetic precursor of these metabolites, umbelliferone, were determined by HPLC method in shoots cultivated in vitro and in overground parts of plants growing in open air. It was shown that light condit

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Bardonnet, Agnès, and Philippe Gaudin. "Influence of Daily Variations of Light and Temperature on the Emergence Rhythm of Grayling Fry (Thymallus thymallus)." Canadian Journal of Fisheries and Aquatic Sciences 48, no. 7 (1991): 1176–80. http://dx.doi.org/10.1139/f91-141.

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The emergence rhythm of grayling fry (Thymallus thymallus) was studied in four aquaria fitted with traps under four different conditions of light and temperature. Both light and temperature induced an emergence rhythm characterized by a 24-h period. Under ambient Sight and constant temperature, emergence peaked at the end of the night before the onset of dawn. Under constant dim light and varying temperature, emergence peaked in early morning during the coldest hours. When both light and temperature fluctuated daily the emergence pattern was equivalent to the "sum" of these previous two regime

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Butler, T. M., S. R. Narayan, S. U. Mooers, and M. J. Siegman. "Rapid turnover of myosin light chain phosphate during cross-bridge cycling in smooth muscle." American Journal of Physiology-Cell Physiology 267, no. 4 (1994): C1160—C1166. http://dx.doi.org/10.1152/ajpcell.1994.267.4.c1160.

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The rate of phosphatase-mediated dephosphorylation of the regulatory light chain of smooth muscle myosin was determined under nearly steady-state conditions in permeabilized muscles, from the time course of incorporation of 33P-labeled phosphate into the light chain after the photolytic release of [gamma-33P]ATP from high specific activity caged [gamma-33P]ATP. The extent of myosin light chain phosphorylation is unchanged, and, if the kinase and phosphatase reactions are irreversible, the rate constant for the exponential increase in 33P in the light chain is equal to the rate constant for the

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Zhao, Kankan, Bin Ma, Yan Xu, Erinne Stirling, and Jianming Xu. "Light exposure mediates circadian rhythms of rhizosphere microbial communities." ISME Journal 15, no. 9 (2021): 2655–64. http://dx.doi.org/10.1038/s41396-021-00957-3.

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AbstractMicrobial community circadian rhythms have a broad influence on host health and even though light-induced environmental fluctuations could regulate microbial communities, the contribution of light to the circadian rhythms of rhizosphere microbial communities has received little attention. To address this gap, we monitored diel changes in the microbial communities in rice (Oryza sativa L.) rhizosphere soil under light–dark and constant dark regimes, identifying microbes with circadian rhythms caused by light exposure and microbial circadian clocks, respectively. While rhizosphere microb

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Hong, Yunkyung, Yunho Jin, Kanghui Park, et al. "Elevated Serum Melatonin under Constant Darkness Enhances Neural Repair in Spinal Cord Injury through Regulation of Circadian Clock Proteins Expression." Journal of Clinical Medicine 8, no. 2 (2019): 135. http://dx.doi.org/10.3390/jcm8020135.

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We investigated the effects of environmental lighting conditions regulating endogenous melatonin production on neural repair, following experimental spinal cord injury (SCI). Rats were divided into three groups randomly: the SCI + L/D (12/12-h light/dark), SCI + LL (24-h constant light), and SCI + DD (24-h constant dark) groups. Controlled light/dark cycle was pre-applied 2 weeks before induction of spinal cord injury. There was a significant increase in motor recovery as well as body weight from postoperative day (POD) 7 under constant darkness. However, spontaneous elevation of endogenous me

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