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...[继续阅读]

    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. 铁元素存在于硫铁蛋白上,而不是血红素基团上。硫铁蛋白是电子传递过程中的电子载体。...[继续阅读]

    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...[继续阅读]

    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.主要由硅藻类生物的硅质外壳组成的混合细粉末,可用做过滤或吸附的基质。...[继续阅读]

    · 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...[继续阅读]

    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.由胰腺上的胰岛分泌的一种多肽激素。胰岛素控制着葡萄糖进入细胞。...[继续阅读]

    An organism that can tolerate high hydrostatic pressure.能够耐受高水压的生物。...[继续阅读]

    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...[继续阅读]

    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 ...[继续阅读]

    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组特征。例如,由单个基因突变所引起的遗传病可以表现一系列不同的表型...[继续阅读]