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Author |
Leise, T.L.; Goldberg, A.; Michael, J.; Montoya, G.; Solow, S.; Molyneux, P.; Vetrivelan, R.; Harrington, M.E. |
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Title |
Recurring circadian disruption alters circadian clock sensitivity to resetting |
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Journal Article |
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Year |
2018 |
Publication |
The European Journal of Neuroscience |
Abbreviated Journal |
Eur J Neurosci |
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in press |
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Animals |
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Abstract  |
A single phase advance of the light:dark (LD) cycle can temporarily disrupt synchrony of neural circadian rhythms within the suprachiasmatic nucleus (SCN) and between the SCN and peripheral tissues. Compounding this, modern life can involve repeated disruptive light conditions. To model chronic disruption to the circadian system, we exposed male mice to more than a month of a 20 h light cycle (LD10:10), which mice typically cannot entrain to. Control animals were housed under LD12:12. We measured locomotor activity and body temperature rhythms in vivo, and rhythms of PER2::LUC bioluminescence in SCN and peripheral tissues ex vivo. Unexpectedly, we discovered strong effects of the time of dissection on circadian phase of PER2::LUC bioluminescent rhythms, which varied across tissues. White adipose tissue was strongly reset by dissection, while thymus phase appeared independent of dissection timing. Prior light exposure impacted the SCN, resulting in strong resetting of SCN phase by dissection for mice housed under LD10:10, and weak phase shifts by time of dissection in SCN from control LD12:12 mice. These findings suggest that exposure to circadian disruption may desynchronize SCN neurons, increasing network sensitivity to perturbations. We propose that tissues with a weakened circadian network, such as the SCN under disruptive light conditions, or with little to no coupling, e.g., some peripheral tissues, will show increased resetting effects. In particular, exposure to light at inconsistent circadian times on a recurring weekly basis disrupts circadian rhythms and alters sensitivity of the SCN neural pacemaker to dissection time. This article is protected by copyright. All rights reserved. |
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Neuroscience Program, Smith College, Northampton, MA, 01063, USA |
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0953-816X |
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PMID:30269396 |
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no |
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Call Number |
GFZ @ kyba @ |
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2036 |
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Author |
Tahar, M., Ahmad, N., & Ismail, N. |
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Title |
Identifying Light Pollution Sources at Two Major Observatories in Malaysia |
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Journal Article |
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Year |
2020 |
Publication |
Sains Malaysiana |
Abbreviated Journal |
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49 |
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2 |
Pages |
439-445 |
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Keywords |
Skyglow |
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Abstract |
A spectral observation and analysis were conducted in order to identify the main contributor of sky brightness at two of Malaysia’s most active observatories. The light pollution observations were carried out under moonless clear night sky
with a 90 mm refractor telescope and SBIG’s Self Guiding Spectrograph. We found that the main contributor to Balai Cerap Teluk Kemang (BCTK) sky brightness is High Pressure Sodium (HPS) street lighting due to its number and density
used within 5 km radius of the observatory. HPS spectral lines dominate the spectrum between 556 – 640 nm, agrees with the orange hue visible to the naked eye. The intensity due to HPS lighting is so high that there was no trace of the
concerned white LED spotlight less than 1 km away. However, some traces of elements from Mercury Vapor (MV) lamps at 3.6 km distance managed to reach the observatory in the green spectrum. The finding concludes that the nearby LED
spotlight does not affect the night sky brightness over BCTK. Meanwhile, Langkawi National Observatory (LNO) sky profile was also observed during heavy fishing season as comparison. The sky spectra for LNO was similar to BCTK in
the reds except for a very distinct peak in green region corresponding highly with green MV (532 – 547 nm) with peaks at 536 nm and 546 nm, matches the lamps used for squid fishing around the island. The intensity of the green MV light matches the intensity of HPS light sources, during the observation period of peak squid season in January. This made LNO a far less favorable condition for astronomical observing site compared to BCTK. We also found that LNO sky has brightened 3.767 times compared to finding of 2013. |
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IDA @ intern @ |
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2951 |
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Shi, L.; Foody, G.M.; Boyd, D.S.; Girindran, R.; Wang, L.; Du, Y.; Ling, F. |
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Title |
Night-time lights are more strongly related to urban building volume than to urban area |
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Journal Article |
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Year |
2020 |
Publication |
Remote Sensing Letters |
Abbreviated Journal |
Remote Sensing Letters |
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11 |
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1 |
Pages |
29-36 |
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Keywords |
Remote Sensing; Urban; Night Lights |
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Abstract |
A strong relationship between night-time light (NTL) data and the areal extent of urbanized regions has been observed frequently. As urban regions have an important vertical dimension, it is hypothesized that the strength of the relationship with NTL can be increased by consideration of the volume rather than simply the area of urbanized land. Relationships between NTL and the area and volume of urbanized land were determined for a set of towns and cities in the UK, the conterminous states of the USA and countries of the European Union. Strong relationships between NTL and the area urbanized were observed, with correlation coefficients ranging from 0.9282 to 0.9446. Higher correlation coefficients were observed for the relationship between NTL and urban building volume, ranging from 0.9548 to 0.9604; The difference in the correlations obtained with volume and with area was statistically significant at the 95% level of confidence. Studies using NTL data may be strengthened by consideration of the volume rather than just area of urbanized land. |
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Key Laboratory for Environment and Disaster Monitoring and Evaluation, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan, China; shilingfei14(at)mails.ucas.ac.cn |
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Taylor & Francis |
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English |
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English |
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2150-704X |
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IDA @ john @ |
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2783 |
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Author |
Manning, R., Newman, P., Barber, J., Monz, C., Hallo, J., & Lawson, S. |
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Title |
Principles for Studying and Managing Natural Quiet and Natural Darkness in National Parks and Other Protected Areas |
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Journal Article |
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2018 |
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The George Wright Forum |
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35 |
Issue |
3 |
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350-362 |
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Conservation; Planning; Regulation |
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Abstract |
A substantial body of research on natural quiet and natural darkness in national
parks, and protected areas more broadly, has been reported in the scientific and professional literature in recent years. However, this literature is widely scattered over many academic and professional journals that cover both the natural and social sciences. To help integrate and synthesize this body of work, we surveyed this diverse literature and collected representative examples in a book (Manning et al. 2018). We conclude our book with a series of principles
that we have distilled to help guide park managers to protect natural quiet and natural darkness. This paper presents those principles.
Much of our book focuses on national parks in the United States, and in the remainder of this paper the phrase “the national parks” refers to them. But we feel that the principles we have derived from our review of the scientific and professional literature on natural quiet and natural darkness apply equally well to a variety of parks and protected areas in the United States and elsewhere.
Natural quiet is generally defined as the sounds of nature uninterrupted by human-caused noise, and natural darkness is darkness unaffected by human-caused light. It is important to note that natural quiet and natural darkness do not necessarily mean absolute quiet or darkness, as the natural world often generates sounds of its own (e.g., birds calling, wind blowing,
rivers rushing) and has sources of illumination (e.g., the glow of celestial bodies and the fluorescence of some plants and animals). |
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IDA @ intern @ |
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2297 |
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Author |
Li, Q.F.; Yang, G.X.; Yu, L.H.; Zhang, H. |
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Title |
A survey of the luminance distribution in the nocturnal environment in Shanghai urban areas and the control of luminance of floodlit buildings |
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Journal Article |
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2006 |
Publication |
Lighting Research & Technology |
Abbreviated Journal |
Lighting Research & Technology |
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38 |
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3 |
Pages |
185-189 |
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Keywords |
Lighting |
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Abstract |
A survey of the luminance distribution of the nocturnal environment in Shanghai urban areas, which included 11 locations and 16 buildings, was made. The 11 locations could be categorized as commercial, administration, leisure or residential. The average environmental luminance of these was recorded. The authors identified the effects of excessive exterior lighting. The luminance was measured and subjective appraisals made of 16 buildings. The writers have developed an empirical formula for arriving at the brightness level rating for floodlit buildings and recommended corresponding working ranges of luminance. |
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1477-1535 |
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GFZ @ kyba @ |
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2715 |
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