Background... ■One of the most common methods of communication among animals involves secretion and detection of tiny amounts of chemicals called pheromones. The honeybee secretes a pheromone called isoanyl acetate(乙酸异戊醇酯)that acts as an alarm signal to other bees. Pheromones
College Background… of Science ◼One of the most common methods of communication among animals involves secretion and detection of tiny amounts of chemicals called pheromones. ◼The honeybee secretes a pheromone called isoamyl acetate(乙酸异戊醇酯)that acts as an alarm signal to other bees. Pheromones
Background... Taxol was first isolated (1962) from the bark of the Pacific yew tree（短叶紫杉). It is produced today by semisynthesis from a precursor found in abundance in the needles and twigs嫩枝. >Taxol or paclitaxel used to treat breast and ovarian cancers. 紫杉醇，红豆杉醇 有丝分裂纺锤体 >Taxol blocks the division of the mitotic spindle resulting in the arrest of cell replication and cell death
College Background… of Science ◼Taxol was first isolated (1962) from the bark of the Pacific yew tree（短叶紫杉）. ◼It is produced today by semisynthesis from a precursor found in abundance in the needles and twigs嫩枝. ➢Taxol or paclitaxel used to treat breast and ovarian cancers. ➢Taxol blocks the division of the mitotic spindle resulting in the arrest of cell replication and cell death. 紫杉醇，红豆杉醇 有丝分裂纺锤体
Aspirin Millions of aspirin tablets are sold in the world each year. 前体 An extract from willow bark,a precursor to modern aspirin,was used in the 1800's
College of Science Aspirin ◼Millions of aspirin tablets are sold in the world each year. ◼An extract from willow bark, a precursor to modern aspirin, was used in the 1800’s. 前体
第二节； 有机物特性（P2) ■数目多，组成复杂，异构现象频繁，但组成元 素种类少 ■溶沸点低，易挥发，易燃烧 ■不导电，难溶于水，易溶于有机溶剂 ■化学反应速度慢，副反应多
College 第二节 有机物特性（P2）of Science ◼数目多，组成复杂，异构现象频繁，但组成元 素种类少 ◼溶沸点低，易挥发，易燃烧 ◼不导电，难溶于水，易溶于有机溶剂 ◼化学反应速度慢，副反应多
Number of Organic Compounds There are between10,000,000 and 20,000,000 (30,000,000)?organic compounds known. These compounds are all made from the atoms C”,“H”,“O”,and“N”and the Halogens.. ■The Question to answer is:“How can so many compounds form using so few elements?
College Number of Science of Organic Compounds ◼There are between10,000,000 and 20,000,000 (30,000,000)？organic compounds known. ◼These compounds are all made from the atoms “C”, “H”, “O”, and “N” and the Halogens. ◼The Question to answer is : “How can so many compounds form using so few elements?