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Author |
Takemura, A.; Ueda, S.; Hiyakawa, N.; Nikaido, Y. |
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Title |
A direct influence of moonlight intensity on changes in melatonin production by cultured pineal glands of the golden rabbitfish, Siganus guttatus |
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Journal Article |
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Year |
2006 |
Publication |
Journal of Pineal Research |
Abbreviated Journal |
J Pineal Res |
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Volume  |
40 |
Issue |
3 |
Pages |
236-241 |
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Keywords |
Animals; Circadian Rhythm; *Light; Melatonin/biosynthesis/*secretion; *Moon; Organ Culture Techniques; Perciformes/*physiology; Pineal Gland/physiology/*radiation effects |
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Abstract |
Rabbitfish are a restricted lunar-synchronized spawner that spawns around a species-specific lunar phase. It is not known how the fish perceive changes in cues from the moon. One possible explanation is that rabbitfish utilize changes in moonlight intensity to establish synchrony. The purpose of the present study was to examine whether or not the pineal gland of the golden rabbitfish can directly perceive changes in moonlight intensity. Isolated pineal glands were statically cultured under natural or artificial light conditions and melatonin secreted into the culture medium was measured using a time-resolved fluoroimmunoassay. Under an artificial light/dark cycle, melatonin secretion significantly increased during the dark phase. Under continuous light conditions, melatonin secretion was suppressed, while culture under continuous dark conditions seemed to duplicate melatonin secretion corresponding to the light/dark cycle in which the fish were acclimated. When cultured pineal glands were kept under natural light conditions on the dates of the full and the new moon, small amounts of melatonin were secreted at night. Moreover, exposure of cultured pineal glands to artificial and natural light conditions resulted in a significant decrease of melatonin secretion within 2 hr. These results suggest that the isolated pineal gland of golden rabbitfish responds to environmental light cycles and that 'brightness' of the night moon has an influence on melatonin secretion from the isolated pineal gland. |
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Sesoko Station, Tropical Biosphere Research Center, University of the Ryukyus, Motobu, Okinawa, Japan. tilapia@lab.u-ryukyu.ac.jp |
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0742-3098 |
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PMID:16499560 |
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IDA @ john @ |
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70 |
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Author |
Reiter, R.J.; Gultekin, F.; Manchester, L.C.; Tan, D.-X. |
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Title |
Light pollution, melatonin suppression and cancer growth |
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Journal Article |
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Year |
2006 |
Publication |
Journal of Pineal Research |
Abbreviated Journal |
J Pineal Res |
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Volume |
40 |
Issue |
4 |
Pages |
357-358 |
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Keywords |
Human Health; Animals; Cell Division; Cell Line, Tumor; Humans; *Light; Melatonin/*antagonists & inhibitors; Neoplasms/*pathology; Rats |
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0742-3098 |
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PMID:16635025 |
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LoNNe @ kagoburian @ |
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798 |
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Curtis, A.M.; FitzGerald, G.A. |
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Title |
Central and peripheral clocks in cardiovascular and metabolic function |
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Journal Article |
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Year |
2006 |
Publication |
Annals of Medicine |
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Ann Med |
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38 |
Issue |
8 |
Pages |
552-559 |
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Human Health |
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0785-3890 |
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LoNNe @ kagoburian @ |
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730 |
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Powe, N.A; Willis, K.G.; Garrod, G.D. |
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Title |
Difficulties in Valuing Street Light Improvement: Trust, Surprise and Bound Effects |
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2006 |
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Applied Economics |
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38 |
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4 |
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371–381 |
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Economics |
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LoNNe @ kagoburian @ |
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1055 |
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Author |
Gardner, C. |
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Title |
The use and misuse of coloured light in the urban environment |
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Journal Article |
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Year |
2006 |
Publication |
Optics & Laser Technology |
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Optics & Laser Technology |
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38 |
Issue |
4-6 |
Pages |
366-376 |
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Keywords |
Planning; Society; Psychology |
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Abstract |
The last few years have seen a huge increase in the transfer of coloured architectural lighting, derived from entertainment and theatre, into the urban and exterior environment. Part of the reason for this is that in the last 15 yr or so, there have been a number of important introductions in coloured lighting technology. These have transformed lighting practice, and while their widespread introduction is seen by some as an enrichment of the urban fabric, others see it as presenting considerable dangers, in terms of aesthetics, perception and in terms of civic identity. Its negative effects on the urban environment have been termed ‘colour blight’.
In this paper, the range of coloured lighting technologies is surveyed and other causes for the increase in coloured lighting are also discussed, together with the problems and benefits involved. Finally, some tentative means are put forward for resolving the problems caused by ‘colour blight’. Current good practice is illustrated by the author's own experience, including his consultancy's participation in a number of urban lighting strategies in the UK and elsewhere. This work involves implementation of a comprehensive lighting plan for the historic city of York, as part of the Urban Lighting Group consortium of three lighting design practices. |
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0030-3992 |
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GFZ @ kyba @ |
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2183 |
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