In lateral organs,such as a leaf,the lower surface i.e. the side,facing awayfrom the main axis. Abaxial is synonymouswith dorsal when the latter term is being ap-plied to lateral organs. Compare adaxial.指側生器官(如葉片)的下表面與植物的主軸相背。當用dorsal(背面的)來描述側...[繼續(xù)閱讀]

    1 . The section of the body cavityof vertebrates that contains the stomach,in-testines,and other viscera.2. The posterior section of the body inarthropods. Primitively it consists of a seriesof similar segments.1.脊椎動物的體腔部分,包括胃、腸和其他內臟。2.節(jié)肢動物體節(jié)的后段...[繼續(xù)閱讀]

    One ofthe pair of nerves that arises from the anteriorend of the medulla oblongata in the vertebratebrain to supply the posterior rectus muscle ofeach eyeball. It contains chiefly motor nervefibers. See cranial nerves.脊椎動物大腦內起始于延髓前端的支配眼球后直肌運動的一對神經...[繼續(xù)閱讀]

    The development of living fromnonliving matter,as in the origin of life.生命物質由非生命物質產生的學說,例如生命的起源。...[繼續(xù)閱讀]

    The nonliving factorsof the environment that influence ecologicalsystems. Abiotic factors include climate,chemical pollution,geographical features,etc.環(huán)境中影響生態(tài)系統(tǒng)的非生物因素,這些因素包括氣候、化學污染、地理特性等。...[繼續(xù)閱讀]

    The fourth and last region ofthe specialized stomach of ruminants (e.g.the cow). It is lined with normal mucosacontaining gastric pits,producing hydrochlo-ric acid,pepsin,and rennin,and is the truedigestive stomach.反芻動物(如牛)特有的最后一個胃,即第四胃。它有正常的凹形的黏膜...[繼續(xù)閱讀]

    A plant hormone,firstisolated from sycamore,that functions chieflyas a growth inhibitor. It promotes abscission(shedding) of flowers and fruits,induces dor-mancy of buds and seeds,and causes closureof leaf pores (stomata). Formerly it was knownas abscisin...[繼續(xù)閱讀]

    The organized loss of part of aplant,usually a leaf,fruit,or unfertilizedflower. An abscission zone occurs at the baseof the organ. Here a separation layer (ab-scission layer) is formed by breakdown orseparation of cells and final severance occurswhen the...[繼續(xù)閱讀]

    The uptake of liquid by cells.Most digested food is absorbed in the smallintestine,the inner surface of which is linedwith finger-like projections (villi): the liquidproducts of digestion are absorbed throughthe villi into the blood and lymphatic sys-tems...[繼續(xù)閱讀]

    A plot of the ab-sorbance by a substance of radiation at differ-ent wavelengths,usually of ultraviolet,visi-ble,or infrared radiation. It can give infor-mation about the identity or quantity of a sub-stance. Chlorophylls,for example,have ab-sorption peaks...[繼續(xù)閱讀]