Thanh toán linh ho?t: Thanh toán ti?n m?t tr?c ti?p khi nh?n tem ho?c thanh toán tr??c qua tài kho?n.Secondary fixation: To enhance the contrast of your minute constructions Within the specimen and give much more balance, a secondary fixation is completed applying osmium tetroxide (OsO4).The photographs let researchers to see samples with a mol