Proposed byDalton in 1804,the principle that when twoelements A and B combine to form morethan one compound,the weights of B thatcombine with a fixed weight of A are insmall whole-number ratios. For example,indinitrogen oxide,N2O,nitrogen monoxide,NO,and ...[继续阅读]

    A positively charged hydro-gen atom,H+,i. e. a proton. Hydrogen i-ons are produced by all acids in water,inwhich they are hydrated to hydroxonium(hydronium)ions,H3O+.See acid;pH.带正电荷的氢原子H+,即1个质子。所有的酸溶于水产生氢离子,在水溶液中以水合氢离子的形式存...[继续阅读]

    See ylid. 参阅ylid。...[继续阅读]

    A SUG-AR found in fruit juices,honey,and canesugar. It is a ketohexose,existing in a pyr-anose form when free. In combination(e.g.in sucrose) it exists in the furanoseform.(C6H12O6) 在果汁、蜂蜜、蔗糖中存在的一种糖。它是一个己酮糖,游离的果糖以吡喃糖形式存在。结合...[继续阅读]

    A molecule consistingof three atoms,such as O3 or H2O.由三个原子组成的分子,如O3或H2O。...[继续阅读]

    An isotope of an element used toinvestigate chemical reactions or physicalprocesses (eg. diffusion). See isotope.用于研究化学反应或物理过程(如扩散)的同位素元素。参阅isotope。...[继续阅读]

    See acid.参阅acid。...[继续阅读]

    One of a group of proteins thatare insoluble in water but will dissolve inneutral solutions of certain salts.They gen-erally contain glycine and coagulate whenheated. Three types of globulin are found inblood:alpha (α),beta (β),and gamma(γ).α and β globul...[继续阅读]

    The ion-COO,producedby ionization of a carboxyl group. In a car-boxylate ion the negative charge is general-ly delocalized over the O-C-O groupingand the two C - O bonds have the samelength,intermediate between that of adouble C=O and a single C-O.—COO离子,...[继续阅读]

    See epinephrine.参阅epinephrine。...[继续阅读]