Effects of Visible Radiations Upon Albino Rats

Allardyce, J. C.; Aldous, J. G.; Cooper, William S.; Pratt, J. A. R.; Sutherland, Ernest

doi:10.1152/ajplegacy.1942.137.4.761

Cited by 2 publications

(1 citation statement)

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“…As early as 1936 Marshall and Bowden [2] observed that in ferrets prema ture estrus could be induced by ultraviolet but not by infrared light. Further, changing the quality of light with colored cellophane filters resulted in changes in the fertility of rats [3]. The spectral properties of light may also influence the sexual maturation of fe male rats determined by the age at vaginal opening [4,5], The development of rat litters born and reared under cool white fluorescent lamp illumination has been compared with the development under artificial lighting with spectral properties more closely resem bling sunlight [6].…”

Section: Introductionmentioning

confidence: 99%

Spectral Properties of Light Affect Plasma and Pituitary Gonadotropins in Male Rats

Laakso

Porkka‐Heiskanen²,

Johansson³

et al. 1987

Horm Res

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In order to find out whether different light spectra have any role in regulating the gonadotropin levels in male rats, we compared the 24-hour patterns of plasma and pituitary gonadotropins in rats kept for 7 days in natural or in cool white artificial lighting (exp. I). The intensity and periodicity of the two lighting conditions were adjusted as similar as possible. Further, we measured plasma and pituitary gonadotropins in the middle of the light period and in the middle of the dark period in rats kept for 7 days under artificial lightings of three different spectra (exp. II). In both experiments, in all lighting conditions we found higher plasma levels of LH and FSH during the dark than the light period. The differences were statistically significant only when the illumination contained more long and/or short wavelengths than the usual cool white laboratory lighting. The pituitary contents of gonadotropins were not found to vary with the periodicity of lighting. In the 24-hour patterns the overall plasma levels were higher and the pituitary contents of gonadotropins lower in natural lighting than in cool white lighting. It was concluded that the spectral properties of light influence the secretion of gonadotropins in male rats, but the mechanism involved remains to be clarified.

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Section: Introductionmentioning

confidence: 99%