到目前为止，他们刚刚对200种青蛙的皮肤分泌物进行了提纯并确定化学结构，因此还有一个大量的抗生素的宝藏有待发掘。
So far, they have purified and determined the chemical structure of barely 200, leaving a potential bonanza of antibiotic substances awaiting discovery.
他们确定了从线粒体基因组提取的一个368碱基对片段的化学结构序列，并且把它与古代犬以及现代犬、狼和郊狼的序列进行了比较。
They sequenced a 368 base pair fragment from the mitochrondrial genome and then compared it to sequences from ancient dogs, as well as to sequences from modern dogs, wolves, and coyotes.
通过上述光谱法确定了该塑料抛光膏的化学组成和结构。
With these spectral methods, the chemical composition and the structure of the polishing paste for plastics were identified.
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