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Author Yang, Y.; Yu, Y.; Yang, B.; Zhou, H.; Pan, J.
Title Physiological responses to daily light exposure Type Journal Article
Year 2016 Publication Scientific Reports Abbreviated Journal Sci Rep
Volume 6 Issue Pages 24808
Keywords Animals
Abstract Long daylength artificial light exposure associates with disorders, and a potential physiological mechanism has been proposed. However, previous studies have examined no more than three artificial light treatments and limited metabolic parameters, which have been insufficient to demonstrate mechanical responses. Here, comprehensive physiological response curves were established and the physiological mechanism was strengthened. Chicks were illuminated for 12, 14, 16, 18, 20, or 22 h periods each day. A quadratic relationship between abdominal adipose weight (AAW) and light period suggested that long-term or short-term light exposure could decrease the amount of AAW. Quantitative relationships between physiological parameters and daily light period were also established in this study. The relationships between triglycerides (TG), cholesterol (TC), glucose (GLU), phosphorus (P) levels and daily light period could be described by quadratic regression models. TG levels, AAW, and BW positively correlated with each other, suggesting long-term light exposure significantly increased AAW by increasing TG thus resulting in greater BW. A positive correlation between blood triiodothyronine (T3) levels and BW suggested that daily long-term light exposure increased BW by thyroid hormone secretion. Though the molecular pathway remains unknown, these results suggest a comprehensive physiological mechanism through which light exposure affects growth.
Address College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
Corporate Author Thesis
Publisher Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2045-2322 ISBN Medium
Area Expedition (up) Conference
Notes PMID:27098210 Approved no
Call Number LoNNe @ kyba @ Serial 1424
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Author Seltmann, S.; Trost, L.; Ter Maat, A.; Gahr, M.
Title Natural melatonin fluctuation and its minimally invasive simulation in the zebra finch Type Journal Article
Year 2016 Publication PeerJ Abbreviated Journal
Volume 4 Issue Pages e1939
Keywords Animals
Abstract Melatonin is a key hormone in the regulation of circadian rhythms of vertebrates, including songbirds. Understanding diurnal melatonin fluctuations and being able to reverse or simulate natural melatonin levels are critical to investigating the influence of melatonin on various behaviors such as singing in birds. Here we give a detailed overview of natural fluctuations in plasma melatonin concentration throughout the night in the zebra finch. As shown in previous studies, we confirm that “lights off” initiates melatonin production at night in a natural situation. Notably, we find that melatonin levels return to daytime levels as early as two hours prior to the end of the dark-phase in some individuals and 30 min before “lights on” in all animals, suggesting that the presence of light in the morning is not essential for cessation of melatonin production in zebra finches. Thus, the duration of melatonin production seems not to be specified by the length of night and might therefore be less likely to directly couple circadian and annual rhythms. Additionally, we show that natural melatonin levels can be successfully simulated through a combination of light-treatment (daytime levels during subjective night) and the application of melatonin containing skin-cream (nighttime levels during subjective day). Moreover, natural levels and their fluctuation in the transition from day to night can be imitated, enabling the decoupling of the effects of melatonin, for example on neuronal activity, from sleep and circadian rhythmicity. Taken together, our high-resolution profile of natural melatonin levels and manipulation techniques open up new possibilities to answer various melatonin related questions in songbirds.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2167-8359 ISBN Medium
Area Expedition (up) Conference
Notes Approved no
Call Number LoNNe @ kyba @ Serial 1425
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Author van Schalkwyk, I.; Venkataraman, N.; Shankar, V.; Milton, J.; Bailey, T.; Calais, K.
Title Evaluation of the Safety Performance of Continuous Mainline Roadway Lighting on Freeway Segments in Washington State Type Report
Year 2016 Publication Abbreviated Journal
Volume Issue Pages
Keywords Public Safety; traffic; traffic safety; road safety; continuous roadway lighting; Washington; United States
Abstract Washington State Department of Transportation (WSDOT) evaluated continuous roadway lighting on mainline freeway segments in Washington State. An extensive literature review on the safety performance of roadway lighting was completed. As part of this research effort WSDOT developed multivariate random parameter (RP) models with specific lighting variables for continuous lighting on mainline freeway segments. Roadway lighting is often used as a countermeasure to address nighttime crashes and this research evaluates common assumption related to roadway lighting. The models developed for this research use crashes from the end of civil dusk twilight to the start of civil dawn twilight since lighting systems are of limited value outside these timeframes. Natural light conditions were estimated for crashes based on location and time of the crash event. Based on the RP results, the research team concludes that the contribution of continuous illumination to nighttime crash reduction is negligible. In addition to the findings on safety performance, a pilot LED project on US101 demonstrated that LED roadway lighting can significantly increase energy efficiency and environmental stewardship (e.g., reducing greenhouse gas emissions) while maintaining safety performance outcomes. The research team recommended modification to WSDOT design policy, including removal of the requirement of continuous mainline lighting and reduction of lighting where segment specific analysis indicates appropriate.
Address Washington State Department of Transportation 310 Maple Park Ave SE, Olympia, WA, USA
Corporate Author Thesis
Publisher Washington State Department of Transportation Place of Publication Editor
Language English Summary Language English Original Title
Series Editor Series Title WSDOT Research Report Abbreviated Series Title
Series Volume Series Issue Edition
ISSN ISBN Medium
Area Expedition (up) Conference
Notes Approved no
Call Number IDA @ john @ Serial 1427
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Author Vozzi, C.; Ramponi, R.
Title 2015 International Year of Light and beyond Type Magazine Article
Year 2016 Publication Journal of Optics Abbreviated Journal J. Opt.
Volume 18 Issue 1 Pages 010201
Keywords Commentary; International Year of Light; IYL; IYL2015; society
Abstract The 2015 International Year of Light and Light-based Technologies (IYL) is now approaching its end. It has been a year full of excitement worldwide, involving people of all ages in an incredible number of different activities
Address Institute for Photonics and Nanotechnologies (IFN-CNR) Piazza Leonardo da Vinci 32, I-20133 Milan, Italy
Corporate Author Thesis
Publisher IOP Place of Publication Editor
Language English Summary Language English Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2040-8978 ISBN Medium
Area Expedition (up) Conference
Notes Approved no
Call Number IDA @ john @ Serial 1428
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Author Buijs, F.N.; Leon-Mercado, L.; Guzman-Ruiz, M.; Guerrero-Vargas, N.N.; Romo-Nava, F.; Buijs, R.M.
Title The Circadian System: A Regulatory Feedback Network of Periphery and Brain Type Journal Article
Year 2016 Publication Physiology (Bethesda, Md.) Abbreviated Journal Physiology (Bethesda)
Volume 31 Issue 3 Pages 170-181
Keywords Human health; circadian rhythm; suprachiasmatic nucleus; brain; clock genes; SCN; review; circadian desynchronization; shiftwork
Abstract Circadian rhythms are generated by the autonomous circadian clock, the suprachiasmatic nucleus (SCN), and clock genes that are present in all tissues. The SCN times these peripheral clocks, as well as behavioral and physiological processes. Recent studies show that frequent violations of conditions set by our biological clock, such as shift work, jet lag, sleep deprivation, or simply eating at the wrong time of the day, may have deleterious effects on health. This infringement, also known as circadian desynchronization, is associated with chronic diseases like diabetes, hypertension, cancer, and psychiatric disorders. In this review, we will evaluate evidence that these diseases stem from the need of the SCN for peripheral feedback to fine-tune its output and adjust physiological processes to the requirements of the moment. This feedback can vary from neuronal or hormonal signals from the liver to changes in blood pressure. Desynchronization renders the circadian network dysfunctional, resulting in a breakdown of many functions driven by the SCN, disrupting core clock rhythms in the periphery and disorganizing cellular processes that are normally driven by the synchrony between behavior and peripheral signals with neuronal and humoral output of the hypothalamus. Consequently, we propose that the loss of synchrony between the different elements of this circadian network as may occur during shiftwork and jet lag is the reason for the occurrence of health problems.
Address Instituto de Investigaciones Biomedicas, Universidad Nacional Autonoma de Mexico, Ciudad Universitaria, Mexico; ruudbuijs(at)gmail.com
Corporate Author Thesis
Publisher American Physiological Society Place of Publication Editor
Language English Summary Language English Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1548-9221 ISBN Medium
Area Expedition (up) Conference
Notes PMID:27053731 Approved no
Call Number IDA @ john @ Serial 1429
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