A carotenoid pigment,examplesbeing lycopene,and α-andβ-carotene. Thelatter compounds are important in animal dietsas a precursor of vitamin A.See carotenoids,photosynthetic pigments.一种类胡萝卜素色素,番茄红素、α-和β-胡萝卜素是这方面的例子。α-和β-胡萝卜素在动物的...[继续阅读]

    A group of bacteriathat ferment carbohydrates in the presence orabsence of oxygen,with lactic acid always amajor end product.They have a high toler-ance of acid conditions.Lactic acid bacteriaare involved in the formation of yoghurt,cheese,sauerkraut,and ...[继续阅读]

    A general level of alertness in ananimal,resulting from activity of a particularpart of the brain.See reticular activating sys-tem .动物警觉的一般水平,来自于大脑特殊部分的活动。参阅714页reticular activating system。...[继续阅读]

    An optically active cyclic sugar al-cohol. It is a component of the vitamin Bcomplex and is required for growth in certainanimals and microorganisms. The stereoiso-mer myo-inositol is a precursor of phos-phatidyl inositol,an important constituent ofanimal...[继续阅读]

    The cold treatment of partial-ly germinated seeds. Certain plants will onlyflower if exposed to low temperatures (1-2℃) at an early period of growth,i.e.theyhave a chilling requirement. Thus winter va-rieties of cereals will only flower in summer ifsown t...[继续阅读]

    The study of all the living andrelevant nonliving components of a naturalcommunity and their relationships with each Compare autecology.autecology。研究所有生物与其相关的自然群落中非生命组分及它们彼此关系的科学。比较67页other....[继续阅读]

    An organic compound with properties similar to those of methane,ethene,ethyne,and their derivatives. Mostaliphatic compounds have an open chainstructure but some,such as cyclohexane andsucrose,have rings. The term is used in dis-tinction to aromatic compo...[继续阅读]

    The plant reproductive bodyin which asexual spores are formed.形成无性孢子的植物生殖体。...[继续阅读]

    Literally ‘in life’ ; describing pro-cesses that occur within the living organism.Compare in vitro.字面上意思为“在生命体内”,指发生在活体内的过程。比较428页in vitro。...[继续阅读]

    The branch of vertebrate zool-ogy that is concerned with the study of birds.脊椎动物学关于鸟类研究的分支。...[继续阅读]