自然界充满着神奇和奥妙,法国微生物兼化学家巴斯德实验发现生物在生长过程中对营养吸收具有选择性.他在含有等重左旋和右旋结晶的培养液里栽培一种植物,其中一种结晶被吸收利用.另一种则被排斥。又如人们十分熟悉的中药牵牛、海金沙、菟丝子的藤总按顺时针(右旋)缠绕向上攀缘,无一株例外.人类日常生活中不可缺少的糖,无论是甘蔗、甜菜、红薯加工制成的,还是瓜果萄葡、梨子、枳椇子、西瓜、哈密瓜里的糖份,它们的分子几何形状大都是右旋的。而人工合成的糖精无旋光性,(?)糖的分子几何形状却是左旋的。三者虽都有类似的甜味,但它们之间有着截然不同的地方,前者能被机体 Nature is full of magic and mystery. The French microbiologist and chemist Pasteur has discovered that organisms are selective for nutrient uptake during growth. He cultivated a plant in a medium containing equal amounts of levorotatory and dextrorotatory crystals. The crystals are absorbed and used. The other is rejected. Another example is that people are very familiar with the traditional Chinese medicine cow, Hai Jinsha, dodder vines are always winding clockwise (right-handed) winding up and climbing, without exception. Human daily life indispensable sugar, whether sugar cane, beet, sweet potato processing Made of, or fruit, grapes, pears, wolfberry fruit, watermelon, cantaloupe sugar, their molecular geometry is mostly right-handed. While synthetic saccharin is non-rotating, the molecular geometry of (?) sugar is left-handed. Although all three have similar sweetness, they have very different places. The former can be absorbed by the body.