digital illustration of lifestraw with filters at bottom for removing soil, dirt and bacteria, chemical iodine in centre to kill viruses and bacteria, and active carbon granules at top where water is purified through process called catalysis - 催化作用 幅插畫檔、美工圖案、卡通及圖標
illustration of catalysis with reactants approaching surface with one of the reactants being a diatomic molecule - 催化作用 幅插畫檔、美工圖案、卡通及圖標
activation mechanism of bacterial thermoalkalophilic lipases, illustration - 催化作用 幅插畫檔、美工圖案、卡通及圖標生物學, 蛋白質
