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.指侧生器官(如叶片)的下表面与植物的主轴相背。当用dorsal(背面的)来描述侧...[继续阅读]

    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.脊椎动物的体腔部分,包括胃、肠和其他内脏。2.节肢动物体节的后段...[继续阅读]

    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.脊椎动物大脑内起始于延髓前端的支配眼球后直肌运动的一对神经...[继续阅读]

    The development of living fromnonliving matter,as in the origin of life.生命物质由非生命物质产生的学说,例如生命的起源。...[继续阅读]

    The nonliving factorsof the environment that influence ecologicalsystems. Abiotic factors include climate,chemical pollution,geographical features,etc.环境中影响生态系统的非生物因素,这些因素包括气候、化学污染、地理特性等。...[继续阅读]

    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.反刍动物(如牛)特有的最后一个胃,即第四胃。它有正常的凹形的黏膜...[继续阅读]

    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...[继续阅读]

    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...[继续阅读]

    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...[继续阅读]

    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...[继续阅读]