Kazan medical journalKazan medical journal0368-48142587-9359Eco-Vector5752210.17816/kazmj57522Research ArticleOn the issue of daily fluctuations in mortalityBazilevichI.info@eco-vector.comFaculty Therapeutic Clinic of Kiev Med. Institute100319262232973000601202106012021Copyright © 2021, Bazilevich I.2021<p>Periodicity is a law of nature. Every phenomenon undergoes a uniformly consistent rhythmic increase and decrease in the intensity of the tempo. "All nature," says the famous English naturalist Wallace, "is full of rhythmic movements of all kinds, degrees and durations." Even inorganic nature is subject to the laws of rhythm.</p>Kazan Medical archiveКазанский медицинский архив