title: 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.
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.
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism*; D002940:Circadian Rhythm; D003624:Darkness; D006179:Gyrus Cinguli / Q000378:metabolism*; D008027:Light; D008032:Limbic System / Q000502:physiology; D008274:Magnesium / Q000378:metabolism*; D008297:Male; D051381:Rats
chemical_list: D008274:Magnesium; D002118:Calcium