| Records |
| Author |
Taufique, S.T.; Prabhat, A.; Kumar, V. |
Title  |
Light at night affects hippocampal and nidopallial cytoarchitecture: Implication for impairment of brain function in diurnal corvids |
Type |
Journal Article |
| Year |
2018 |
Publication |
Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology |
Abbreviated Journal |
J Exp Zool A Ecol Integr Physiol |
| Volume |
in press |
Issue |
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Pages |
in press |
| Keywords |
Animals |
| Abstract |
Our previous studies have shown that light at night (LAN) impaired cognitive performance and affected neurogenesis and neurochemistry in the cognition-associated brain regions, particularly the hippocampus (HP) and lateral caudal nidopallium (NCL) of Indian house crows (Corvus splendens). Here, we examined the cytoarchitecture and mapped out the morphology of neurons and glia-neuron density in HP and NCL regions of crows that were first entrained to 12-hr light (LL): 12-hr darkness (LD) and then exposed to the light regime in which 12-hr darkness was either replaced by daytime light (i.e., constant light, LL) or by dim light (i.e., dim light at night, dLAN), with controls continued on LD 12:12. Compared with LD, there was a significant decrease in the soma size, suggesting reduced neuronal plasticity without affecting the neuronal density of both HP and NCL of crows under LL and dLAN conditions. In parallel, we found a reduced number of glia cells and, hence, decreased glia-neuron ratio positively correlated with soma size in both, HP and NCL regions. These results for the first time demonstrate LAN-induced negative effects on the brain cytoarchitecture of a diurnal species and give insight for possible influence on the brain health and functions in animals including humans that might be inadvertently exposed to LAN in an emerging night-illuminated urban environment. |
| Address |
Department of Zoology, University of Delhi, Delhi, India |
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| Language |
English |
Summary Language |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
2471-5638 |
ISBN |
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| Notes |
PMID:30288960 |
Approved |
no |
| Call Number |
GFZ @ kyba @ |
Serial |
2022 |
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| Author |
Russart, K.L.G.; Nelson, R.J. |
| Title |
Light at night as an environmental endocrine disruptor |
Type |
Journal Article |
| Year |
2018 |
Publication |
Physiology & Behavior |
Abbreviated Journal |
Physiol Behav |
| Volume |
190 |
Issue |
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Pages |
82-89 |
| Keywords |
Human Health; Animals |
| Abstract |
Environmental endocrine disruptors (EEDs) are often consequences of human activity; however, the effects of EEDs are not limited to humans. A primary focus over the past approximately 30years has been on chemical EEDs, but the repercussions of non-chemical EEDs, such as artificial light at night (LAN), are of increasing interest. The sensitivity of the circadian system to light and the influence of circadian organization on overall physiology and behavior make the system a target for disruption with widespread effects. Indeed, there is increasing evidence for a role of LAN in human health, including disruption of circadian regulation and melatonin signaling, metabolic dysregulation, cancer risk, and disruption of other hormonally-driven systems. These effects are not limited to humans; domesticated animals as well as wildlife are also exposed to LAN, and at risk for disrupted circadian rhythms. Here, we review data that support the role of LAN as an endocrine disruptor in humans to be considered in treatments and lifestyle suggestions. We also present the effects of LAN in other animals, and discuss the potential for ecosystem-wide effects of artificial LAN. This can inform decisions in agricultural practices and urban lighting decisions to avoid unintended outcomes. |
| Address |
Department of Neuroscience, The Ohio State University Wexner Medical Center, Columbus, OH 43210, USA |
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| Language |
English |
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| ISSN |
0031-9384 |
ISBN |
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| Notes |
PMID:28870443 |
Approved |
no |
| Call Number |
LoNNe @ kyba @ |
Serial |
1719 |
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| Author |
Alaasam, V.J.; Duncan, R.; Casagrande, S.; Davies, S.; Sidher, A.; Seymoure, B.; Shen, Y.; Zhang, Y.; Ouyang, J.Q. |
| Title |
Light at night disrupts nocturnal rest and elevates glucocorticoids at cool color temperatures |
Type |
Journal Article |
| Year |
2018 |
Publication |
Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology |
Abbreviated Journal |
J Exp Zool A Ecol Integr Physiol |
| Volume |
329 |
Issue |
8-9 |
Pages |
465-472 |
| Keywords |
Animals |
| Abstract |
Nighttime light pollution is quickly becoming a pervasive, global concern. Since the invention and proliferation of light-emitting diodes (LED), it has become common for consumers to select from a range of color temperatures of light with varying spectra. Yet, the biological impacts of these different spectra on organisms remain unclear. We tested if nighttime illumination of LEDs, at two commercially available color temperatures (3000 and 5000 K) and at ecologically relevant illumination levels affected body condition, food intake, locomotor activity, and glucocorticoid levels in zebra finches (Taeniopygia guttata). We found that individuals exposed to 5000 K light had higher rates of nighttime activity (peaking after 1 week of treatment) compared to 3000 K light and controls (no nighttime light). Birds in the 5000 K treatment group also had increased corticosterone levels from pretreatment levels compared to 3000 K and control groups but no changes in body condition or food intake. Individuals that were active during the night did not consequently decrease daytime activity. This study adds to the growing evidence that the spectrum of artificial light at night is important, and we advocate the use of nighttime lighting with warmer color temperatures of 3000 K instead of 5000 K to decrease energetic costs for avian taxa. |
| Address |
Department of Biology, University of Nevada, Reno, Nevada |
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English |
Summary Language |
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Edition |
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| ISSN |
2471-5638 |
ISBN |
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Conference |
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| Notes |
PMID:29766666 |
Approved |
no |
| Call Number |
GFZ @ kyba @ |
Serial |
1909 |
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| Author |
Huang, Z.; Liu, Q.; Westland, S.; Pointer, M.; Luo, M.R.; Xiao, K. |
| Title |
Light dominates colour preference when correlated colour temperature differs |
Type |
Journal Article |
| Year |
2018 |
Publication |
Lighting Research & Technology |
Abbreviated Journal |
Lighting Research & Technology |
| Volume |
50 |
Issue |
7 |
Pages |
995-1012 |
| Keywords |
Vision; Lighting |
| Abstract |
Colour preference for lighting is generally influenced by three kinds of contextual factors, the light, the object and the observer. In this study, a series of psychophysical experiments were conducted to investigate and compare the effect of certain factors on colour preference, including spectral power distribution of light, lighting application, observers’ personal colour preference, regional cultural difference and gender difference. LED lights with different correlated colour temperatures were used to illuminate a wide selection of objects. Participant response was quantified by a 7-point rating method or a 5-level ranking method. It was found that the preferred illumination for different objects exhibited a similar trend and that the influence of light was significantly stronger than that of other factors. Therefore, we conclude that the light itself (rather than, e.g. the objects that are viewed) is the most crucial factor for predicting which light, among several candidates with different correlated colour temperatures, an observer will prefer. In addition, some of the gamut-based colour quality metrics correlated well with the participants’ response, which corroborates the view that colour preference is strongly influenced by colour saturation. The familiarity of the object affects the ratings for each experiment while the colour of the objects also influences colour preference. |
| Address |
School of Printing and Packaging, Wuhan University, Luoyu Road 129, Wuhan, China; liuqiang(at)whu.edu.cn |
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SAGE |
Place of Publication |
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| Language |
English |
Summary Language |
English |
Original Title |
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Series Issue |
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Edition |
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| ISSN |
1477-1535 |
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| Notes |
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Approved |
no |
| Call Number |
IDA @ john @ |
Serial |
2256 |
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| Author |
Liu, Q.; Manning, A.J.; Duston, J. |
| Title |
Light intensity and suppression of nocturnal plasma melatonin in Arctic charr (Salvelinus alpinus) |
Type |
Journal Article |
| Year |
2018 |
Publication |
Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology |
Abbreviated Journal |
Comp Biochem Physiol A Mol Integr Physiol |
| Volume |
in press |
Issue |
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Pages |
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| Keywords |
Animals |
| Abstract |
The problem of early sexual maturation among farmed Arctic charr and other salmonids can be effectively reduced by 24h light overwinter, provided it is bright enough to over-ride interference from the natural daylength cycle. To determine the threshold light intensity to suppress the nocturnal elevation of plasma melatonin, three groups of individually tagged fish (n=26-28/group ca. 1040g) were reared on 12h light: 12h dark (LD 12:12) and subjected to nighttime light intensities of either 50-65, 0.1-0.3 or 0 (control) lux for five months (November to April). Daytime light intensity was 720-750lx. Diel plasma melatonin profiles in both November and April were similar; mean daytime levels ranged from 20 to 100pg/ml, and nighttime levels were inversely proportional to light intensity. In the control group at 0lx, plasma melatonin increased about four-fold after lights-off, ranging between 320 and 430pg/ml. Nighttime light intensity of 0.1-0.3lx halved plasma melatonin levels to 140-220pg/ml, and 50-65lx further reduced the levels to one quarter of the control group, 68-108pg/ml. Among the lit groups, daytime plasma melatonin levels were about 20-30pg/ml, significantly lower than the nocturnal levels suggesting the diel hormonal rhythm was not completely abolished. Fish grew steadily from about 1100g to 1600g between November and April, independent of light intensity (P=.67). Overall, the study demonstrated the sensitivity of pineal melatonin hormone to different light intensities in Arctic charr. |
| Address |
Department of Animal Science and Aquaculture, Dalhousie University, Agricultural Campus, Truro, NS B2N 5E3, Canada |
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English |
Summary Language |
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Original Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
1095-6433 |
ISBN |
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Medium |
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Expedition |
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Conference |
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| Notes |
PMID:30471350 |
Approved |
no |
| Call Number |
GFZ @ kyba @ |
Serial |
2111 |
| Permanent link to this record |
