| Records |
| Author |
Blagonravov, M.L.; Bryk, A.A.; Medvedeva, E.V.; Goryachev, V.A.; Chibisov, S.M.; Kurlaeva, A.O.; Agafonov, E.D. |
| Title |
Structure of Rhythms of Blood Pressure, Heart Rate, Excretion of Electrolytes, and Secretion of Melatonin in Normotensive and Spontaneously Hypertensive Rats Maintained under Conditions of Prolonged Daylight Duration |
Type |
Journal Article |
| Year |
2019 |
Publication |
Bulletin of Experimental Biology and Medicine |
Abbreviated Journal |
Bull Exp Biol Med |
| Volume |
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Issue |
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Pages |
in press |
| Keywords |
Animals; arterial hypertension; biological rhythms; excessive exposure to light; melatonin |
| Abstract |
We studied the structure of rhythms of BP, HR (by telemetric monitoring), electrolyte excretion (by capillary electrophoresis), and products of epiphyseal melatonin (by the urinary concentration of 6-sulfatoxymelatonin measured by ELISA) in normotensive Wistar-Kyoto rats and spontaneously hypertensive SHR rats maintained at 16/8 h and 20/4 h light-dark regimes. In Wister-Kyoto rats exposed to prolonged daylight, we observed changes in the amplitude, rhythm power (% of rhythm), and range of oscillations of systolic BP; HR mezor decreased. In SHR rats, mezor of HR also decreased, but other parameters of rhythms remained unchanged. Changes in electrolyte excretion were opposite in normo- and hypertensive rats. Under conditions of 20/4 h light-dark regime, daytime melatonin production tended to increase in normotensive rats and significantly increased in SHR rats. At the same time, nighttime melatonin production did not change in both normotensive and hypertensive animals. As the secretion of melatonin has similar features in animals of both lines, we can say that the epiphyseal component of the “biological clock” is not the only component of the functional system that determines the response of the studied rhythms to an increase in the duration of light exposure. |
| Address |
V. A. Frolov Department of General Pathology and Pathophysiology, Institute for Medicine, Peoples' Friendship University of Russia, Moscow, Russia |
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English |
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0007-4888 |
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| Notes |
PMID:31741240 |
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no |
| Call Number |
GFZ @ kyba @ |
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2755 |
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| Author |
Marwan, W.; Hegemann, P.; Oesterhelt, D. |
| Title |
Single photon detection by an archaebacterium |
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Journal Article |
| Year |
1988 |
Publication |
Journal of Molecular Biology |
Abbreviated Journal |
Journal of Molecular Biology |
| Volume |
199 |
Issue |
4 |
Pages |
663-664 |
| Keywords |
Bacteria |
| Abstract |
Halobacteria are attracted by green and repelled by near ultraviolet or blue light. The photophobic response to blue light is mediated by the retinal protein P480. The analysis of stimulus response curves with Poisson statistical methods reveals that the photophobic response can be elicited at minimum by a single photon. |
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0022-2836 |
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no |
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GFZ @ kyba @ |
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2754 |
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Wanjiru Mbugua, S.; Hay Wong, C.; Ratnayeke, S. |
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Effects of artificial light on the larvae of the firefly Lamprigera sp. in an urban city park, Peninsular Malaysia |
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Journal Article |
| Year |
2019 |
Publication |
Journal of Asia-Pacific Entomology |
Abbreviated Journal |
Journal of Asia-Pacific Entomology |
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Issue |
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Pages |
in press |
| Keywords |
Animals |
| Abstract |
Firefly populations are threatened globally by habitat alteration, pesticide use, and anthropogenic sources of light. Lamprigera fireflies were recently reported at an urban city park in Kuala Lumpur, Peninsular Malaysia. Here we report on the responses of Lamprigera larvae to artificial light from street lamps on paved park trails. Larvae were located farther from artificial light sources when street lamps were illuminated than when they were not, and mostly where light intensities were lowest, off park trails. Larvae that were located within the direct field of illumination tended to be immobile, whereas, when street lamps were turned off, they actively travelled paved trails. Larvae positioned directly in the path of downwelling light from street lamps at dusk may therefore experience an effectively longer diurnal period, limited time for active foraging, and greater exposure to pedestrian traffic. |
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1226-8615 |
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no |
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GFZ @ kyba @ |
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2753 |
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| Author |
Thompson, E.K.; Cullinan, N.L.; Jones, T.M.; Hopkins, G.R. |
| Title |
Effects of artificial light at night and male calling on movement patterns and mate location in field crickets |
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Journal Article |
| Year |
2019 |
Publication |
Animal Behaviour |
Abbreviated Journal |
Animal Behaviour |
| Volume |
158 |
Issue |
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Pages |
183-191 |
| Keywords |
Animals |
| Abstract |
Anthropogenic factors, such as artificial light at night (ALAN), are increasingly linked to significant modifications in animal behaviours, such as foraging or migration. However, few studies have investigated directly whether the presence of ALAN affects the ability to find a mate (mate location). One direct effect of the presence of ALAN is that it can create a light barrier in an otherwise dark environment. This may have significant behavioural implications for nocturnally active species if it affects their ability to respond to potential mates. Our study, using the acoustically orienting Australian black field cricket, Teleogryllus commodus, determined experimentally whether the presence of a fragmented light environment influenced movement patterns of virgin females and males. Moreover, given the importance of male song for reproductive outcomes in this species, we assessed simultaneously whether such behaviours were modified by the presence of a male attraction call. We found that while initiation of movement was slower in the presence of ALAN, the behavioural shifts associated with its presence were relatively small compared to the influence of a broadcast male attraction call. The response to the male attraction call was typically stronger for females than for males, but both males and females modified aspects of behaviour when it was present regardless of whether their immediate environment was fragmented by artificial light at night or not. Artificial light at night may alter subtle aspects of movement and mating behaviour in this species, but ultimately does not provide a barrier to movement or mate location. |
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0003-3472 |
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no |
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GFZ @ kyba @ |
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2752 |
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| Author |
Te Kulve, M.; Schlangen, L.J.M.; van Marken Lichtenbelt, W.D. |
| Title |
Early evening light mitigates sleep compromising physiological and alerting responses to subsequent late evening light |
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Journal Article |
| Year |
2019 |
Publication |
Scientific Reports |
Abbreviated Journal |
Sci Rep |
| Volume |
9 |
Issue |
1 |
Pages |
16064 |
| Keywords |
Human Health |
| Abstract |
The widespread use of electric light and electronic devices has resulted in an excessive exposure to light during the late-evening and at night. This late light exposure acutely suppresses melatonin and sleepiness and delays the circadian clock. Here we investigate whether the acute effects of late-evening light exposure on our physiology and sleepiness are reduced when this light exposure is preceded by early evening bright light. Twelve healthy young females were included in a randomised crossover study. All participants underwent three evening (18:30-00:30) sessions during which melatonin, subjective sleepiness, body temperature and skin blood flow were measured under different light conditions: (A) dim light, (B) dim light with a late-evening (22:30-23:30) light exposure of 750 lx, 4000 K, and (C) the same late-evening light exposure, but now preceded by early-evening bright light exposure (18.30-21.00; 1200 lx, 4000 K). Late-evening light exposure reduced melatonin levels and subjective sleepiness and resulted in larger skin temperature gradients as compared to dim. Interestingly, these effects were reduced when the late-evening light was preceded by an early evening 2.5-hour bright light exposure. Thus daytime and early-evening exposure to bright light can mitigate some of the sleep-disruptive consequences of light exposure in the later evening. |
| Address |
Department of Human Biology & Movement Sciences, NUTRIM, Maastricht University, Maastricht, The Netherlands |
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English |
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2045-2322 |
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| Notes |
PMID:31690740; PMCID:PMC6831674 |
Approved |
no |
| Call Number |
GFZ @ kyba @ |
Serial |
2751 |
| Permanent link to this record |
