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Author |
Kang, S.-G.; Yoon, H.-K.; Cho, C.-H.; Kwon, S.; Kang, J.; Park, Y.-M.; Lee, E.; Kim, L.; Lee, H.-J. |
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Title |
Decrease in fMRI brain activation during working memory performed after sleeping under 10 lux light |
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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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Pages  |
36731 |
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Keywords |
Human Health |
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Abstract |
The aim of this study was to investigate the effect of exposure to dim light at night (dLAN) when sleeping on functional brain activation during a working-memory tasks. We conducted the brain functional magnetic resonance imaging (fMRI) analysis on 20 healthy male subjects. All participants slept in a polysomnography laboratory without light exposure on the first and second nights and under a dim-light condition of either 5 or 10 lux on the third night. The fMRI scanning was conducted during n-back tasks after second and third nights. Statistical parametric maps revealed less activation in the right inferior frontal gyrus (IFG) after exposure to 10-lux light. The brain activity in the right and left IFG areas decreased more during the 2-back task than during the 1- or 0-back task in the 10-lux group. The exposure to 5-lux light had no significant effect on brain activities. The exposure to dLAN might influence the brain function which is related to the cognition. |
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Department of Psychiatry, Korea University College of Medicine, Seoul, Korea |
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2045-2322 |
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PMID:27827445; PMCID:PMC5101482 |
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no |
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Call Number |
LoNNe @ kyba @ |
Serial |
1560 |
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Author |
Pacheco-Tucuch, F.S.; Ramirez-Sierra, M.J.; Gourbiere, S.; Dumonteil, E. |
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Title |
Public street lights increase house infestation by the Chagas disease vector Triatoma dimidiata |
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Journal Article |
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Year |
2012 |
Publication |
PloS one |
Abbreviated Journal |
PLoS One |
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Volume |
7 |
Issue |
4 |
Pages |
e36207 |
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Keywords |
Animals; Human Health |
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Abstract |
Triatoma dimidiata is one of the primary vectors of Chagas disease. We previously documented the spatio-temporal infestation of houses by this species in the Yucatan peninsula, Mexico, and found that non-domiciliated triatomines were specifically attracted to houses. However, the factors mediating this attraction remained unclear. Artificial light has been known for a long time to attract many insect species, and therefore may contribute to the spread of different vector-borne diseases. Also, based on the collection of different species of triatomines with light traps, several authors have suggested that light might attract triatomines to houses, but the role of artificial light in house infestation has never been clearly demonstrated and quantified. Here we performed a spatial analysis of house infestation pattern by T. dimidiata in relation to the distribution of artificial light sources in three different villages from the Yucatan peninsula, Mexico. In all three villages, infested houses were significantly closer to public street light sources than non-infested houses (18.0 +/- 0.6 vs 22.6 +/- 0.4 m), and street lights rather than domestic lights were associated with house infestation. Accordingly, houses closer to a public street lights were 1.64 times more likely to be infested than houses further away (OR, CI95% 1.23-2.18). Behavioral experiments using a dual-choice chamber further confirmed that adult male and females were attracted to white light during their nocturnal activity. Attraction was also dependent on light color and decreased with increasing wavelength. While public lighting is usually associated with increased development, these data clearly show that it also directly contributes to house infestation by non-domiciliated T. dimidiata. |
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Laboratorio de Parasitologia, Centro de Investigaciones Regionales Dr. Hideyo Noguchi, Universidad Autonoma de Yucatan, Merida, Yucatan, Mexico |
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1932-6203 |
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PMID:22558384; PMCID:PMC3338588 |
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no |
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LoNNe @ kyba @ |
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1489 |
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Author |
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 |
Issue |
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Pages |
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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ISSN |
2045-2322 |
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PMID:27545669 |
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no |
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LoNNe @ kyba @ |
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1513 |
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Bonmati-Carrion, M.; Arguelles-Prieto, R.; Martinez-Madrid, M.; Reiter, R.; Hardeland, R.; Rol, M.; Madrid, J. |
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Title |
Protecting the Melatonin Rhythm through Circadian Healthy Light Exposure |
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Journal Article |
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Year |
2014 |
Publication |
International Journal of Molecular Sciences |
Abbreviated Journal |
IJMS |
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Volume |
15 |
Issue |
12 |
Pages |
23448-23500 |
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Keywords |
human health; chronodisruption; circadian; light at night (LAN); melanopsin; melatonin |
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Abstract |
Currently, in developed countries, nights are excessively illuminated (light at night), whereas daytime is mainly spent indoors, and thus people are exposed to much lower light intensities than under natural conditions. In spite of the positive impact of artificial light, we pay a price for the easy access to light during the night: disorganization of our circadian system or chronodisruption (CD), including perturbations in melatonin rhythm. Epidemiological studies show that CD is associated with an increased incidence of diabetes, obesity, heart disease, cognitive and affective impairment, premature aging and some types of cancer. Knowledge of retinal photoreceptors and the discovery of melanopsin in some ganglion cells demonstrate that light intensity, timing and spectrum must be considered to keep the biological clock properly entrained. Importantly, not all wavelengths of light are equally chronodisrupting. Blue light, which is particularly beneficial during the daytime, seems to be more disruptive at night, and induces the strongest melatonin inhibition. Nocturnal blue light exposure is currently increasing, due to the proliferation of energy-efficient lighting (LEDs) and electronic devices. Thus, the development of lighting systems that preserve the melatonin rhythm could reduce the health risks induced by chronodisruption. This review addresses the state of the art regarding the crosstalk between light and the circadian system. |
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Department of Physiology, Faculty of Biology, University of Murcia, Murcia 30100, Spain |
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MDPI |
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1422-0067 |
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IDA @ john @ |
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1078 |
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Author |
Smit, A.N.; Broesch, T.; Siegel, J.M.; Mistlberger, R.E. |
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Title |
Sleep timing and duration in indigenous villages with and without electric lighting on Tanna Island, Vanuatu |
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Journal Article |
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Year |
2019 |
Publication |
Scientific Reports |
Abbreviated Journal |
Sci Rep |
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Volume |
9 |
Issue |
1 |
Pages |
17278 |
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Keywords |
Human Health |
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Abstract |
It has been hypothesized that sleep in the industrialized world is in chronic deficit, due in part to evening light exposure, which delays sleep onset and truncates sleep depending on morning work or school schedules. If so, societies without electricity may sleep longer. However, recent studies of hunter-gatherers and pastoralists living traditional lifestyles without electricity report short sleep compared to industrialized population norms. To further explore the impact of lifestyles and electrification on sleep, we measured sleep by actigraphy in indigenous Melanesians on Tanna Island, Vanuatu, who live traditional subsistence horticultural lifestyles, in villages either with or without access to electricity. Sleep duration was long and efficiency low in both groups, compared to averages from actigraphy studies of industrialized populations. In villages with electricity, light exposure after sunset was increased, sleep onset was delayed, and nocturnal sleep duration was reduced. These effects were driven primarily by breastfeeding mothers living with electric lighting. Relatively long sleep on Tanna may reflect advantages of an environment in which food access is reliable, climate benign, and predators and significant social conflict absent. Despite exposure to outdoor light throughout the day, an effect of artificial evening light was nonetheless detectable on sleep timing and duration. |
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Department of Psychology, Simon Fraser University, Burnaby, BC, V5A1S6, Canada. mistlber@sfu.ca |
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English |
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2045-2322 |
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Notes |
PMID:31754265 |
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no |
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Call Number |
GFZ @ kyba @ |
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2764 |
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