See abscisic acid.參閱abscisic acid。...[繼續(xù)閱讀]

    A PLANT HORMONEonce thought to be responsible for theshedding (abscission)of flowers and fruitand for the onset of dormancy in buds(hence its early name,dormin).The com-pound is associated with the closing ofpores(stoma)in the leaves of plants de-prived o...[繼續(xù)閱讀]

    Pure alcohol (ethanol).純酒精(乙醇)。...[繼續(xù)閱讀]

    A particular molec-ular configuration of a CHIRAL molecule,as denoted by comparison with a referencemolecule or by some sequence rule. Thereare two systems for expressing absoluteconfiguration in common use:the D-Lconvention and the R-S convention. Seeopt...[繼續(xù)閱讀]

    Symbol:T A tem-perature defined by the relationship:T=θ+273.15where θ is the Celsius temperature. The ab-solute scale of temperature was a funda-mental scale based on Charles’law,whichapplies to an ideal gas:V=V_0(1 +αθ)where V is the volume at temperatur...[繼續(xù)閱讀]

    The zero value of thermody-namic temperature; 0 kelvin or -273.15℃.See absolute temperature.熱力學(xué)溫度的零值:0°K或-273.15℃。參閱absolutetemperature。...[繼續(xù)閱讀]

    1.A process in which a gas istaken up by a liquid or solid,or in which aliquid is taken up by a solid.In absorption,the substance absorbed goes into the bulkof the material.Solids that absorb gases orliquids often have a porous structure.Theabsorption of ...[繼續(xù)閱讀]

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

    A substance that increases therate of a chemical reaction.In this sense theterm is synonymous with CATALYST.It iscommon to refer to catalysts as‘a(chǎn)ccelerators’in certain industrial applications.For exam-ple,accelerators are used in the VULCANI-ZATION of ru...[繼續(xù)閱讀]

    The atom or group to which apair of electrons is donated in forming aCOORDINATE BOND.指接受一對電子形成配價(jià)鍵的原子或原子團(tuán)。...[繼續(xù)閱讀]