See propenoic acid.參閱propenoic acid。...[繼續閱讀]

    A synthetic resin made bypolymerizing an amide,nitrile,or ester de-rivative of 2-propenoic acid (acrylic acid).Acrylic resins (known as ‘acrylics’) areused in a variety of ways.A common exam-ple is poly(methylmethacrylate),which isproduced polymerizing me...[繼續閱讀]

    See propenonitrile.參閱propenonitrile。...[繼續閱讀]

    Radiation that can causea chemical reaction;for example,ultravioletradiation is actinic.能引起化學反應的輻射,例如,紫外線輻射就具有光化性。...[繼續閱讀]

    Any of a number of antibiot-ics produced by certain bacteria. The mainone,actinomycin D (or dactinomycin),canbind between neighbouring base pairs inDNA,preventing RNA synthesis. It is usedin the treatment of some cancers.由某些細菌產生的一類抗生素。主要的一種是放射菌素D(或更生...[繼續閱讀]

    A graph showing theeffect of different wavelengths of radiation,usually light,on a given process. It is oftensimilar to the ABSORPTION SPECTRUMof the substance that absorbs the radiationand can therefore be helpful in identifyingthat substance. For exampl...[繼續閱讀]

    See charcoal. 參閱charcoal。...[繼續閱讀]

    The partially bondedsystem of atoms in the TRANSITION STATE of a chemical reaction.化學反應的過渡態中原子部分鍵合的體系。...[繼續閱讀]

    Symbol:E. The mini-mum energy a system must acquire before achemical reaction can occur,regardless ofwhether the reaction is exothermic or endo-thermic. Activation energy is often repre-sented as an energy barrier that has to beovercome if a reaction is t...[繼續閱讀]

    See accelerator.參閱accelerator。...[繼續閱讀]