scientist test liquid drops on a leaf sample in a petri dish while working in a laboratory - 生化學家 個影片檔及 b 捲影像00:48
october 17, 2008 laboratory technician opening bagged specimen from national cancer institute and placing the specimen into an air tight glass... - 生化學家 個影片檔及 b 捲影像00:34
october 17, 2008 laboratory technician removing pathology specimen from glass container and placing the specimen into air tight glass container /... - 生化學家 個影片檔及 b 捲影像00:43
october 17, 2008 museum worker opening a cold storage container, inspecting vials, then closing container / washington, d.c., united states - 生化學家 個影片檔及 b 捲影像01:12