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Cho, C.-H.; Moon, J.-H.; Yoon, H.-K.; Kang, S.-G.; Geum, D.; Son, G.-H.; Lim, J.-M.; Kim, L.; Lee, E.-I.; Lee, H.-J. |
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Title |
Molecular circadian rhythm shift due to bright light exposure before bedtime is related to subthreshold bipolarity |
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Journal Article |
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Year |
2016 |
Publication |
Scientific Reports |
Abbreviated Journal |
Sci Rep |
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Volume |
6 |
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31846 |
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Keywords |
Human Health |
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Abstract |
This study examined the link between circadian rhythm changes due to bright light exposure and subthreshold bipolarity. Molecular circadian rhythms, polysomnography, and actigraphy data were studied in 25 young, healthy male subjects, divided into high and low mood disorder questionnaire (MDQ) score groups. During the first 2 days of the study, the subjects were exposed to daily-living light (150 lux) for 4 hours before bedtime. Saliva and buccal cells were collected 5 times a day for 2 consecutive days. During the subsequent 5 days, the subjects were exposed to bright light (1,000 lux), and saliva and buccal cell samples were collected in the same way. Molecular circadian rhythms were analyzed using sine regression. Circadian rhythms of cortisol (F = 16.956, p < 0.001) and relative PER1/ARNTL gene expression (F = 122.1, p < 0.001) showed a delayed acrophase in both groups after bright light exposure. The high MDQ score group showed a significant delay in acrophase compared to the low MDQ score group only in salivary cortisol (F = 8.528, p = 0.008). The high MDQ score group showed hypersensitivity in cortisol rhythm shift after bright light exposure, suggesting characteristic molecular circadian rhythm changes in the high MDQ score group may be related to biological processes downstream from core circadian clock gene expression. |
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Department of Biomedical Science, Korea University College of Medicine, Seoul, South Korea |
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English |
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2045-2322 |
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PMID:27545669 |
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LoNNe @ kyba @ |
Serial |
1513 |
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Author |
Cho, E.; Oh, J.H.; Lee, E.; Do, Y.R.; Kim, E.Y. |
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Title |
Cycles of circadian illuminance are sufficient to entrain and maintain circadian locomotor rhythms in Drosophila |
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Journal Article |
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Year |
2016 |
Publication |
Scientific Reports |
Abbreviated Journal |
Sci Rep |
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Volume |
6 |
Issue |
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37784 |
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Keywords |
Animals |
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Abstract |
Light at night disrupts the circadian clock and causes serious health problems in the modern world. Here, we show that newly developed four-package light-emitting diodes (LEDs) can provide harmless lighting at night. To quantify the effects of light on the circadian clock, we employed the concept of circadian illuminance (CIL). CIL represents the amount of light weighted toward the wavelengths to which the circadian clock is most sensitive, whereas visual illuminance (VIL) represents the total amount of visible light. Exposure to 12 h:12 h cycles of white LED light with high and low CIL values but a constant VIL value (conditions hereafter referred to as CH/CL) can entrain behavioral and molecular circadian rhythms in flies. Moreover, flies re-entrain to phase shift in the CH/CL cycle. Core-clock proteins are required for the rhythmic behaviors seen with this LED lighting scheme. Taken together, this study provides a guide for designing healthful white LED lights for use at night, and proposes the use of the CIL value for estimating the harmful effects of any light source on organismal health. |
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Neuroscience Graduate Program, BK21 Plus Program, Department of Biomedical Sciences, Ajou University School of Medicine, 164 Worldcup-ro, Suwon, 16499, Republic of Korea |
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English |
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2045-2322 |
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PMID:27883065; PMCID:PMC5121609 |
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LoNNe @ kyba @ |
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1565 |
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Choi, T.; Shao, X.; Cao, C.; Weng, F. |
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Radiometric Stability Monitoring of the Suomi NPP Visible Infrared Imaging Radiometer Suite (VIIRS) Reflective Solar Bands Using the Moon |
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Journal Article |
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Year |
2016 |
Publication |
Remote Sensing |
Abbreviated Journal |
Remote Sensing |
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8 |
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1 |
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15 |
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Instrumentation |
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The Suomi NPP (S-NPP) Visible Infrared Imaging Radiometer Suite (VIIRS) performs the scheduled lunar roll maneuver on a monthly basis. The lunar calibration coefficients and lunar F-factor are calculated by taking the ratio of the lunar observed radiance to the simulated radiance from the Miller and Turner (MT) lunar model. The lunar F-factor is also validated against that derived from the VIIRS Solar Diffuser (SD). The MT model-based lunar F-factors in general agree with SD F-factors. The Lunar Band Ratio (LBR) is also derived from two channel lunar radiances and is implemented in the National Oceanic and Atmospheric Administration (NOAA) Integrated Calibration and Validation System (ICVS) to monitor the VIIRS long-term radiometric performance. The lunar radiances at pixels are summed for each of the VIIRS Reflective Solar Bands (RSBs) and normalized by the reference band M11 which has the most stable SD-based calibration coefficient. LBRs agree with the SD based F-factor ratios within one percent. Based on analysis with these two independent lunar calibration methods, SD-based and LBR-based calibrations show a lifetime consistency. Thus, it is recommended that LBR be used for both VIIRS radiometric calibration and lifetime stability monitoring. |
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2072-4292 |
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LoNNe @ kyba @ |
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1384 |
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Author |
Choo, G.-H.; Jeong, M.-J. |
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Title |
Estimation of nighttime aerosol optical thickness from Suomi-NPP DNB observations over small cities in Korea |
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Journal Article |
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Year |
2016 |
Publication |
Korean Journal of Remote Sensing |
Abbreviated Journal |
Korean Journal of Remote Sensing |
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32 |
Issue |
2 |
Pages |
73-86 |
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Keywords |
Remote Sensing |
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In this study, an algorithm to estimate Aerosol Optical Thickness (AOT) over small cities during nighttime has been developed by using the radiance from artificial light sources in small cities measured from Visible Infrared Imaging Radiometer Suite (VIIRS) sensor's Day/Night Band (DNB) aboard the Suomi-National Polar Partnership (Suomi-NPP) satellite. The algorithm is based on Beer's extinction law with the light sources from the artificial lights over small cities. AOT is retrieved for cloud-free pixels over individual cities, and cloud-screening was conducted by using the measurements from M-bands of VIIRS at infrared wavelengths. The retrieved nighttime AOT is compared with the aerosol products from MODerate resolution Imaging Spectroradiometer (MODIS) aboard Terra and Aqua satellites. As a result, the correlation coefficients over individual cities range from around 0.6 and 0.7 between the retrieved nighttime AOT and MODIS AOT with Root-Mean-Squared Difference (RMSD) ranged from 0.14 to 0.18. In addition, sensitivity tests were conducted for the factors affecting the nighttime AOT to estimate the range of uncertainty in the nighttime AOT retrievals. The results of this study indicate that it is promising to infer AOT using the DNB measaurements over small cities in Korea at night. After further development and refinement in the future, the developed retrieval algorithm is expected to produce nighttime aerosol information which is not operationally available over Korea. |
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1225-6161 |
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LoNNe @ kyba @ |
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1524 |
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Author |
Ciriminna, R.; Meneguzzo, F.; Albanese, L.; Pagliaro, M. |
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Title |
Solar street lighting: a key technology en route to sustainability: Solar street lighting technology for sustainability |
Type |
Journal Article |
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Year |
2016 |
Publication |
Wiley Interdisciplinary Reviews: Energy and Environment |
Abbreviated Journal |
WIREs Energy Environ |
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Volume |
6 |
Issue |
2 |
Pages |
in press |
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Keywords |
Lighting, Energy |
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Abstract |
Today’s solar street LED lights are able to provide reliable, quality lighting both in developing and developed countries, thereby reducing light poverty and the economic and environmental costs of electric outdoor lighting. Rapid technical innovation and dramatic price reduction in the LED, PV module, and battery components, which has occurred in the last 5 years, will accelerate the penetration of solar street LED lights across the world. Applications will not be limited to countries with significant insolation only but will extend to Northern regions as well. This study provides a critical overview of a technology that will play an important role en route to global sustainability. |
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2041-8396 |
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LoNNe @ kyba @ |
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1487 |
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