单词	sterane
释义	sterane /ˈstɪəreɪn / /ˈstɛreɪn/ noun Chemistry Any of a class of saturated polycyclic hydrocarbons which are found in crude oils and are derived from the sterols of ancient organisms.This biomarker group is, like the steranes, characterized by numerous maturity-sensitive stereoisomers.... But because steranes are commonly degraded by bacteria, they are of limited use. Contrary to expectation, the relative abundance of steranes seems to be lower than that of the hopanoids, with the variety of hopanoid structures greatly outnumbering those of the steranes. Origin 1950s: from steroid + -ane2.
随便看	mouldable mould-blowing mould-blown mouldboard mould-breaker mould-breaking mould cavity moulder mouldery mould furrow mouldily mouldiness moulding moulding board moulding box moulding plane moulding powder moulding sand moulding table mouldiwarp mould loft mouldly mould-made mould oil mould room

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