The way in which organismsor parts of organisms function. Comparemorphology.研究生物體或其任一部分行使功能的方法,比較morpholo-gy。...[繼續(xù)閱讀]

    A complexnetwork of secreted polysaccharides andproteins that forms a sheet beneath cells such as endothelial and epithelial cells.由多糖和蛋白質(zhì)構(gòu)成的復(fù)雜網(wǎng)狀結(jié)構(gòu),在細胞(例如內(nèi)皮和上皮細胞)下形成薄層。...[繼續(xù)閱讀]

    British cell bi-ologist who was awarded the 2001 NobelPrize for physiology or medicine jointlywith L.H. Hartwell and P. M. Nurse fordiscoveries of the key regulators of the cellcycle.英國細胞生物學(xué)家,他因與L. H.Hartwell和P.M.Nurse合作發(fā)現(xiàn)細胞周期的重要調(diào)節(jié)因子而獲得2001年...[繼續(xù)閱讀]

    The most active ESTROGENproduced by the body. It promotes prolifer-ation of the endometrium of the wombduringthe first half of the estrous cycle toprepare the womb for ovulation,and is alsoimportant in female development.It is me-tabolized to estrone and ...[繼續(xù)閱讀]

    See optical activity.參閱 optical activity。...[繼續(xù)閱讀]

    A plant in which carbon dioxideis initially fixed by phosphoenolpyruvatecarboxylase (PEP carboxylase) to form a4-carbondicarboxylic acid. C4 plants haveevolved from C3 plants by a modification incarbon dioxide fixation,leading to more ef-ficient photosynt...[繼續(xù)閱讀]

    An intermediate in the synthesis ofdopamine,norepinephrine,and epinephrineand in the conversion of tyrosine to melaninpigments. 1-DOPA is used to treatParkinson’s disease,a primary cause ofwhich is a deficiency of dopamine in thebrain cells. Dopamine itse...[繼續(xù)閱讀]

    A complex nucleotidecontaining an active-SH group that is readilyacetylated to CoAS-COCH3 (acetyl CoA). A-cetyl CoA is the source of the two-carbon u-nits that feed into the KREBS CYCLE. It isproduced from glycolysis and the breakdownof fatty acids and so...[繼續(xù)閱讀]

    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. ...[繼續(xù)閱讀]

    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...[繼續(xù)閱讀]