antique illustration of 19th century industry, technology and craftsmanship: metallurgy steelmaking furnace - 鐵 幅插畫檔、美工圖案、卡通及圖標鋼鐵廠
haemoglobin molecule. computer artwork showing the structure of a haemoglobin molecule. haemoglobin is a metalloprotein that transports oxygen around the body in red blood cells. each molecule consists of iron-containing haem groups and globin protei - 鐵 幅插畫檔、美工圖案、卡通及圖標血紅素, 蛋白質, 二氧化碳