The transport of mole-cules or ions across a cell membrane against aconcentration gradient,with the expenditureof energy: it is probably an attribute of allcells. Anything that interferes with theprovision of energy will interfere with ac-tive transport. ...[继续阅读]

    A protein complex found inmuscle,formed between molecules of AC-TIN and MYOSIN present in adjacentthick and thin muscle filaments. These ac-tomyosin complexes are involved in theprocess of muscle contraction; their forma-tion is important in the concerted...[继续阅读]

    A chemical reaction in which anacyl group is introduced into a compound.将酰基导入某化合物的一种化学反应。...[继续阅读]

    An organic group with thegeneral formula R - CO -。The acetylgroup,CH3 -CO-is a simple example.有机基团,其通式为R-CO-。如乙酰基CH3-CO—。为一简单的酰基。...[继续阅读]

    Anenzyme that is produced by a cell only inthe presence of its substrate. Compare con-stitutive enzyme.只有当酶底物存在的情况下细胞才能产生的一种酶。比较constitutive enzyme。...[继续阅读]

    A reaction in which ad-ditional atoms or groups of atoms are in-troduced into an unsaturated compound. Asimple example is the addition of bromineacross the double bond in ethene:H2C:CH2+Br2 →BrH2CCH2BrAddition reactions can be induced ei-ther by electroph...[继续阅读]

    A compound formed by direct ad-dition of two chemical species,especiallyone produced by forming a coordinate bondbetween a donor and an acceptor.通过两类化学试剂的直接加成得到的化合物。特指电子供体和受体通过配位键形成的化合物。Adenine腺嘌呤...[继续阅读]

    A nitrogenous base found inDNA and RNA. It is also a constituent ofcertain coenzymes,e. g. NAD and FAD,and when combined with the sugar ribose itforms the nucleoside adenosine found inAMP,cAMP,ADP,and ATP. Adenine hasa purine ring structure. See also DNA....[继续阅读]

    A NU-CLEOSIDE formed from adenine linked toD-ribose with aβ-glycosidic bond. It iswidely found in all types of cell,either asthe free nucleoside or in combination in nu-cleic acids. Phosphate esters of adenosine,such as ATP,are important carriers of en-er...[继续阅读]

    See ADP参阅ADP。...[继续阅读]