See acetylcholine.参阅4页acetylcholine。...[继续阅读]
海量资源,尽在掌握
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]
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]
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]
See staining.参阅773页 staining。...[继续阅读]
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]
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]
See auditory nerve. 参阅66页 auditory nerve。...[继续阅读]
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]
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]