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英汉双解生物学 共有 3411 个词条内容

ACh

    See acetylcholine.参阅4页acetylcholine。...[继续阅读]

英汉双解生物学

achene

    A dry indehiscent fruit formed froma monocarpellary ovary containing a singleseed. Different types of achenes include thecaryopsis,cypsela,nut,and samara. Seealso etaerio.由内含一粒种子的单心皮子房形成的不开裂干果。不同类型的瘦果包括颖果、连萼瘦果、坚果和翼果...[继续阅读]

英汉双解生物学

acid

    A substance that gives rise to hydro-gen ions (or H3O+) when dissolved in wa-ter. An acid in solution will have a pH below7.This definition does not take into accountthe competitive behavior of acids in solventsand it refers only to aqueous systems. TheLo...[继续阅读]

英汉双解生物学

acid- base balance

    Maintenance of the optimum pH of body fluids by regulating theacid; base ratio. This usually involves abuffer system (see buffer). For examplemammalian blood must be maintained at apH of7.4,which requires a ratio of carbonicacid to bicarbonate of 1∶20; an...[继续阅读]

英汉双解生物学

acidic stain

    See staining.参阅773页 staining。...[继续阅读]

英汉双解生物学

acid rain

    The deposition of acids by natu-ral precipitation (e. g. rain,snow,fog),leading to acid pollution. The very diluteacids are formed by reaction of gaseous wasteproducts (e. g. sulfur dioxide,nitrogen ox-ide ,or carbon monoxide ),with moisturepresent in the...[继续阅读]

英汉双解生物学

acid value

    A measure of the free acid pre-sent in fats,oils,resins,plasticizers,andsolvents,defined as the number of milligramsof potassium hydroxide required to neutralizethe free acids in one gram of the substance.测量脂肪、油脂、树脂、可塑剂、溶剂中游离酸含量的值。其数值为中和...[继续阅读]

英汉双解生物学

acoustic nerve

    See auditory nerve. 参阅66页 auditory nerve。...[继续阅读]

英汉双解生物学

acoustico-lateralis system

    A system found in fish and certain amphibians consisting ofthe neuromast cells in various tracts on ornear the surface of the body (i.e. the later-al-line system) and the inner ear (membra-nous labyrinth ). Neuromasts and receptorcells of the inner ear ar...[继续阅读]

英汉双解生物学

acquired characteristics

    Changes in thestructure or function of an organ or systemduring the life of an organism,brought aboutby the use or disuse of that organ or system,or by environmental influences. For exam-ple,sportsmen may develop strong muscles,and plants growing near coa...[继续阅读]

英汉双解生物学