See corticotropin.参阅corti-cotropin。...[继续阅读]

    A protein that is a major constituentof muscle and is heavily involved with theprocess of muscle contraction. It is alsofound in the microfilaments (part of theCYTOSKELETON)present in almost alleukaryote cells,where it accounts for 1-5% of the total prote...[继续阅读]

    Any of a number ofproteins that bind to ACTIN and modify itsproperties. Examples are dystrophin,filamin,caldesmon,and the myosins.任何可以结合肌动蛋白并且修饰其特性的一系列蛋白质。如,肌营养不良蛋白、丝蛋白、钙调蛋白和肌球蛋白。...[继续阅读]

    Agroup of bacteria characterized by a myceli-al fungus-like growth habit and belongingto the phylum Actinobacteria. They are nu-merous in the topsoil and are important in soilfertility. Some may cause infections in animalsand humans. Most of the antibioti...[继续阅读]

    Any of a number of antibiot-ics produced by certain bacteria. The mainone ,actinom ycin D (or dactinom ycin),canbind between neighbouring base pairs inDNA,preventing RNA synthesis. It is usedin the treatment of some cancers.放线菌产生的一系列抗生素。主要如放线菌素D(或称更生霉素...[继续阅读]

    The transitory change inelectrical potential that occurs across themembrane of a nerve or muscle fiber duringthe passage of a nervous impulse. The de-gree of change is independent of thestrength of the impulse;it either occurs ordoes not. In the absence o...[继续阅读]

    spectrum 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. F...[继续阅读]

    The partially bondedsystem of atoms in the transition state of achemical reaction.一种化学反应中的过渡状态下原子局部结合的体系。...[继续阅读]

    Symbol: Ea The mini-mum energy a particle,molecule,etc. ,mustacquire before it can react; i. e. the energyrequired to initiate a reaction regardless ofwhether the reaction is exothermic or endo-thermic. Activation energy corresponds toan energy barrier th...[继续阅读]

    The region of an ENZYMEmolecule that combines with and acts onthe substrate. It consists of catalytic aminoacids arranged in a configuration specific toa particular substrate or type of substrate.The ones that are in direct combination arethe contact amin...[继续阅读]