This paper presents a determination method of specific activity for uranium isotope in rocks, soil, water and thorium isotope in rocks using 232u as a tracer isotope.

本文介绍了用(232u)作示踪同位素，测定岩石、土壤、水体中铀同位素及岩石中钍同位素比活度的方法。

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Biological assays play an important role both in conventional drug quality control and in determination of biological activity of a compound with unknown structures.

生物检定在药品质量的常规检验以及对一些未知结构化合物活性的测定中占有重要的地位。

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Taking the Insect-fermented Tea as raw material, the quantitative determination of general nutrient content and the qualitative determination biological activity material have been researched.

以老鹰茶虫酿茶为原料，定量分析一般营养成分的含量和定性测定了生理活性物质。

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Investors should be told because not only does such activity impact upon the investment results they receive, but it also is material to a determination of whether a manager maintains the ethical standards the investor seeks.

FORBES: Mutual Fund Personal Trading Illegalities: Letter to Barry Barbash, Director of Division of Investment Management, Securities and Exchange Commission (July 1, 1998)