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 ...[繼續(xù)閱讀]

    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.帶正電荷的氫原子H+,即1個(gè)質(zhì)子。所有的酸溶于水產(chǎn)生氫離子,在水溶液中以水合氫離子的形式存...[繼續(xù)閱讀]

    See ylid. 參閱ylid。...[繼續(xù)閱讀]

    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、蔗糖中存在的一種糖。它是一個(gè)己酮糖,游離的果糖以吡喃糖形式存在。結(jié)合...[繼續(xù)閱讀]

    A molecule consistingof three atoms,such as O3 or H2O.由三個(gè)原子組成的分子,如O3或H2O。...[繼續(xù)閱讀]

    An isotope of an element used toinvestigate chemical reactions or physicalprocesses (eg. diffusion). See isotope.用于研究化學(xué)反應(yīng)或物理過程(如擴(kuò)散)的同位素元素。參閱isotope。...[繼續(xù)閱讀]

    See acid.參閱acid。...[繼續(xù)閱讀]

    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...[繼續(xù)閱讀]

    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離子,...[繼續(xù)閱讀]

    See epinephrine.參閱epinephrine。...[繼續(xù)閱讀]