{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2023,10,27]],"date-time":"2023-10-27T05:11:14Z","timestamp":1698383474119},"reference-count":40,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2007,1,30]],"date-time":"2007-01-30T00:00:00Z","timestamp":1170115200000},"content-version":"vor","delay-in-days":4200,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal of Pineal Research"],"published-print":{"date-parts":[[1995,8]]},"abstract":"<jats:p><jats:bold>Abstract: <\/jats:bold> Photic regulation of the pineal melatonin synthesis was studied in 3\u2010 to 21\u2010day\u2010old rat pups by exposing the animals to light at night (30\u201340 min) or to darkness during the day (30\u2013240 min). The pineal melatonin contents were measured by radioimmunoassay. A significant day\/night difference in the melatonin content and the nocturnal light\u2010induced decrease were not found until second postnatal week. A novel finding was that at the age of 13\u201317 days a daytime dark exposure elevated the pineal melatonin content; it was twofold as compared with the normal daytime level and about half of the nocturnal peak level. In 21\u2010day\u2010old rats the response had disappeared, while the nocturnal suppression by light persisted. The dark\u2010induced increase of the melatonin synthesis was independent of the opening of the eyelids which occurs in pups at the age of two weeks, but it was greater in maternally isolated than non\u2010isolated pups. The results suggest that one component of the circadian regulatory system matures at the end of the third postnatal week. This mechanism inhibits the elevation of the melatonin synthesis by darkness during the daytime.<\/jats:p>","DOI":"10.1111\/j.1600-079x.1995.tb00167.x","type":"journal-article","created":{"date-parts":[[2007,2,2]],"date-time":"2007-02-02T21:57:18Z","timestamp":1170453438000},"page":"23-30","source":"Crossref","is-referenced-by-count":5,"title":["Daytime dark exposure increases pineal melatonin in rat pups"],"prefix":"10.1111","volume":"19","author":[{"given":"Maija\u2010Liisa","family":"Laakso","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Taina","family":"H\u00e4t\u00f6nen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Aino","family":"Alila","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2007,1,30]]},"reference":[{"key":"e_1_2_1_2_1","first-page":"45","article-title":"Postnatal evolution of the rat pineal gland: light microscopy","volume":"138","author":"Calvo J.","year":"1984","journal-title":"J. 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