Bright light at night alters the perception of daylength in Indian weaver bird (Ploceus philippinus)

2018 ◽  
Vol 329 (8-9) ◽  
pp. 488-496 ◽  
Author(s):  
Jayant Kumar ◽  
Shalie Malik ◽  
Sanjay Kumar Bhardwaj ◽  
Sangeeta Rani
Keyword(s):  
Bright Light ◽  
Light At Night ◽  
Ploceus Philippinus

Bright light and night work: effects on selective and divided attention in elderly persons

2011 ◽  
Vol 43 (4) ◽  
pp. 473-486 ◽  
Author(s):  
V Kretschmer ◽  
B Griefahn ◽  
K-H Schmidt
Keyword(s):  
Divided Attention ◽  
Cognitive Abilities ◽  
Bright Light ◽  
Error Rates ◽  
Night Work ◽  
Elderly Persons ◽  
Statistical Control ◽  
Light At Night ◽  
Attention Task ◽  
Divided Attention Task

Night work is associated with reduced levels of performance. Due to demographic change, the ability of over 50-year-olds to work at night is important for the employment market. Ageing is associated with decrements in both cognitive abilities and the capabilities of the visual system. This study focuses on the effects of exposure to bright light at night on selective and divided attention in elderly persons during three consecutive night shifts. After statistical control for neuroticism and intelligence as covariates, the results demonstrate that exposure to bright light at night reduced error rates for a divided attention task but performance on a selective attention task was unaffected.

scholarly journals Light at night disrupts diel patterns of cytokine gene expression and endocrine profiles in zebra finch (Taeniopygia guttata)

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Ila Mishra ◽  
Reinhard M. Knerr ◽  
Alexander A. Stewart ◽  
Wesley I. Payette ◽  
Melanie M. Richter ◽  
...  
Keyword(s):  
Gene Expression ◽  
Bright Light ◽  
Taeniopygia Guttata ◽  
Diurnal Rhythms ◽  
Cytokine Gene Expression ◽  
Zebra Finches ◽  
Cytokine Gene ◽  
Light At Night ◽  
Peripheral Tissues ◽  
Diel Patterns

Abstract Increased exposure to light pollution perturbs physiological processes through misalignment of daily rhythms at the cellular and tissue levels. Effects of artificial light-at-night (ALAN) on diel properties of immunity are currently unknown. We therefore tested the effects of ALAN on diel patterns of cytokine gene expression, as well as key hormones involved with the regulation of immunity, in zebra finches (Taeniopygia guttata). Circulating melatonin and corticosterone, and mRNA expression levels of pro- (IL-1β, IL-6) and anti-inflammatory (IL-10) cytokines were measured at six time points across 24-h day in brain (nidopallium, hippocampus, and hypothalamus) and peripheral tissues (liver, spleen, and fat) of zebra finches exposed to 12 h light:12 h darkness (LD), dim light-at-night (DLAN) or constant bright light (LLbright). Melatonin and corticosterone concentrations were significantly rhythmic under LD, but not under LLbright and DLAN. Genes coding for cytokines showed tissue-specific diurnal rhythms under LD and were lost with exposure to LLbright, except IL-6 in hypothalamus and liver. In comparison to LLbright, effects of DLAN were less adverse with persistence of some diurnal rhythms, albeit with significant waveform alterations. These results underscore the circadian regulation of biosynthesis of immune effectors and imply the susceptibility of daily immune and endocrine patterns to ALAN.

Phase-shifts in melatonin, 6-sulphatoxymelatonin and alertness rhythms after treatment with moderately bright light at night

2010 ◽  
Vol 40 (3) ◽  
pp. 413-420 ◽  
Author(s):  
Stephen J. Deacon ◽  
Josephine Arendt
Keyword(s):  
Bright Light ◽  
Phase Shifts ◽  
Light At Night

Morning bright light therapy: a helpful tool for reducing comorbid symptoms of affective and behavioral dysregulation in juvenile depressed inpatients? A pilot trial

2017 ◽  
Vol 45 (1) ◽  
pp. 34-41 ◽  
Author(s):  
Sarah Bogen ◽  
Tanja Legenbauer ◽  
Stephanie Gest ◽  
Martin Holtmann
Keyword(s):  
Pilot Trial ◽  
Secondary Analysis ◽  
Bright Light ◽  
Light Therapy ◽  
Bright Light Therapy ◽  
Circadian Phase ◽  
Behavioral Dysregulation ◽  
Sleep Parameters ◽  
Circadian Effect ◽  
Dysregulation Profile

Abstract. Objective: In recent years, bright light therapy (BLT) has been used to treat depression and to stabilize circadian rhythms. In this study we evaluated whether it is also helpful for comorbid symptoms of affective and behavioral dysregulation in depressive inpatients. Method: This article reports a secondary analysis comparing two subgroups of depressive participants with comorbid affective and behavioral dysregulation, captured with the dysregulation-profile of the Strengths and Difficulties Questionnaire (SDQ-DP; n = 16 vs. n = 11). Participants were randomly allocated to active BLT (10,000 lux) or control BLT (approx. 100 lux), and received 45 minutes of BLT for 2 weeks. SDQ-DP scores, sleep parameters, and circadian preference were assessed at baseline, after the intervention, and 3 weeks later. Results: No direct effects on SDQ-DP scores were observed. Sleep improved in both conditions. Only in the active BLT condition was a circadian phase advance found. Correlation and regression analyses indicated an indirect, circadian effect for improved SDQ-DP scores. Conclusions: The data of this pilot trial should be considered preliminary and merely descriptive. Further research is warranted.


Sulfonamides Are an Overlooked Class of Electron Donors in Luminogenic Luciferins and Fluorescent Dyes

2018 ◽  
Author(s):  
Deepak K. Sharma ◽  
Spencer T. Adams ◽  
Kate L. Liebmann ◽  
Adam Choi ◽  
Stephen Miller
Keyword(s):  
Fluorescent Dyes ◽  
Bright Light ◽  
Firefly Luciferase ◽  
Electron Donors ◽  
Light Emitting

Many fluorophores, and all bright light-emitting substrates for firefly luciferase, contain hydroxyl or amine electron donors. Here we show that sulfonamides can serve as replacements for these canonical groups. Unlike “caged” carboxamides, sulfonamide analogues enable bioluminescence, and sulfonamidyl luciferins, coumarins, rhodols, and rhodamines are fluorescent in water. Sulfonamide donors thus have previously unappreciated potential to expand the functional repertoire of luminescent molecules.

Baya Weaver (Ploceus philippinus)

2020 ◽  
Author(s):  
Adrian Craig
Keyword(s):  
Ploceus Philippinus
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