On December 14, 2019 in 10.00 in the academic building No. 1 of Tashkent medical academy for students 3 courses of medical-preventive faculty the associate professor of Department Communal hygiene and occupational health, PhD in Medicine Sherkuziyeva G.F. will give an open lesson on a subject: «Determination of the optimal dose of coagulant. Ecological and hygienic assessment of coagulation efficiency».