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小馬

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  • N5驅動程式

    N5驅動程式誰有可以給我ㄇ

    謝謝好心ㄉ大德 20點

    寄到我信箱

    f120788801@yahoo.com.tw

    1 個解答其他:電腦1 0 年前
  • 急~~~~請大家幫幫忙翻譯一篇英文文章,謝謝大家

    Application Natural versus Synthetic

    Prior to the development of organic chemistry as a science, only substances obtained directly from plants and animals were available for treating diseases, dying clothes, cleansing and perfuming our bodies, and so forth. Extracts of the opium poppy, for instance, have been used since the seventeenth century for the relief of pain. The prized purple dye called Tyrian purple, obtained from a Middle Eastern mollusk, has been known since antiquity. Oils distilled from bergamot, sweet bay, rose, and lavender, have been employed for centuries in making perfume.

    Many of these naturally occurring substances were first used without any knowledge of their chemical composition. As organic chemistry developed, though, chemists learned how to work out the structures of compounds. The disease-curing properties of limes and other citrus fruits, for example, were known for centuries, but the chemical structure of vitamin C, the active ingredient, was not determined until 1933. Today there is a revival of interest in folk remedies, and a large effort is being made to identify medicinally important chemical compounds found in plants.

    1 個解答語言1 0 年前