PMID: 6540033Jan 1, 1984Paper

Effect of different illumination conditions on circadian changes of Ca++ and Mg++ level in the cingulate gyrus of the limbic system of the mouse brain

Acta Physiologica Hungarica
M H Lewandowski

Abstract

The effect of different illumination conditions on circadian changes of the Ca++ and Mg++ level in the cingulate gyrus of the mouse brain was investigated. The tissue was collected one and four weeks following the introduction of an altered illumination pattern at 4 h intervals. The ion level was assessed using the atomic absorption method. The control group (LD 12/12) revealed an ultradian rhythmicity of the ion concentration. In animals kept at LD 0.5/23.5 a marked disturbance of the rhythm was observed one and four weeks after introduction of the new illumination conditions. The photophase lasting 0.5 h also induced different responses of the organism when introduced at different times of the day.

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