The physical conditions in an organism’s surrounding environment. Microorganisms that live in the human gut,for example,have an ambient temperature of 37℃. Organisms that exist in dust particles in a room have an ambient temperature of about 23℃,or room t...[繼續(xù)閱讀]

    Iron atoms that are found in iron-sulfur proteins as opposed to heme groups. The iron-sulfur proteins are electron carriers in the process of electron transport. 鐵元素存在于硫鐵蛋白上,而不是血紅素基團(tuán)上。硫鐵蛋白是電子傳遞過程中的電子載體。...[繼續(xù)閱讀]

    A form of a molecule involving different arrangements of atoms or molecules around a central atom,usually carbon in biomolecules. Stereoisomers are also referred to as optical isomers because crystals of stereoisomers cause polarized light to slant in way...[繼續(xù)閱讀]

    A finely pulverized mixture of earth composed largely of the silicon shells of the microorganisms diatoms used as a filtering substance or as an absorbant.主要由硅藻類生物的硅質(zhì)外殼組成的混合細(xì)粉末,可用做過濾或吸附的基質(zhì)。...[繼續(xù)閱讀]

    · affinity chromatography—a technique for separating a substance from a mixture based on its natural tendency to bind to another substance (a ligand) for which it is said have an affinity. In affinity chromatography,a liquid suspension or solution contain...[繼續(xù)閱讀]

    A polypeptide hormone secreted by a part of the pancreas known as the islets of Langerhans,which controls the entry of glucose into cells. A deficiency of insulin production is the underlying cause of diabetes.由胰腺上的胰島分泌的一種多肽激素。胰島素控制著葡萄糖進(jìn)入細(xì)胞。...[繼續(xù)閱讀]

    An organism that can tolerate high hydrostatic pressure.能夠耐受高水壓的生物。...[繼續(xù)閱讀]

    A thin flexible membrane made of nitrocellulose,a material that noncovalently binds tightly to a variety of biological materials,including proteins and nucleic acids. Because of this property,nitrocellulose is widely used as a binding material for carryin...[繼續(xù)閱讀]

    A joining together of separated sections of an RNA molecule to generate new RNAs. In the process by which mRNAs are created from long RNA precursors in the nucleus,sections of RNA that represent introns are spliced out so that segments representing exons ...[繼續(xù)閱讀]

    A set of characteristics that are usually associated with the same cause. For example,genetic diseases caused by a single mutation can result in a number of different phenotypes. 由相同原因所致的一組特征。例如,由單個基因突變所引起的遺傳病可以表現(xiàn)一系列不同的表型...[繼續(xù)閱讀]