半衰期

THPL, a newtypesemisynthesis anticancer drug of the kind of anthracene nucleus, adds a pyran ring onthe aminosaccharide of ADR to increase the activity of anticancer and the drugconcentration in target cell obviously, has less demiperiod and side effects.

THP是新一代半合成蒽环类抗肿瘤药物，是在阿酶素的氨基糖4'端加了一个吡喃环，使它抗肿瘤的活性、靶细胞的药物浓度明显提高，半衰期缩短，毒副作用明显减少。

The half-life is the time taken for half of the atoms of a radioactive substance to decay.

的半衰期是花费的时间为半原子的放射性物质腐烂。

The radioactive isotope iodine-131, with an eight-day half-life, is very useful in medicine and other applications

放射性同位素碘－131的半衰期为8天，在医学和其它应用中都很有用。

She has also determined the oxygen and other elements half-lives, published a series of about radioactive has been importantly discussing.

她还测定了氧及其他元素的半衰期，发表了一系列关于放射性的重要论著。

The radiochemical separation procedure of 132Ⅰ was designed on the basis of half-lives of iodine and tellurium isotopes in mixed fission products.

依据混合裂变产物中碘及其母体啼的同位素的半衰期设计分离132Ⅰ的流程。

The comparison result of the decay rate and the half-life verified the correctness and feasibility of the optics evaluating method.

利用泡沫衰变速度与宏观出液半衰期对比分析结果，验证了光学评价方法的正确性和可行性。

It is a safe and effective agent; has a rapid onset and short duration of action; and is easily administered orally, intravenously, rectally, or intramuscularly.

它安全有效，半衰期短易于代谢，口服、静注、经直肠给药或肌注都很方便。

Nuclear Run-on Assay was used to address the contribution of transcriptioninitiation to the regulation of five histones by YSV. Actinomycin D inhibitor studies were used to detect the mRNA half-life of five histones. SLBP weremeasured by Western blot assay to identify regulation of YSV on Pre-mRNAsplicing.

应用Nuclear Run-on Assay观察YSV对人肝癌BEL-7402细胞的五种组蛋白转录效率的影响；应用放线菌素D转录抑制法观察YSV对组蛋白mRNA半衰期的影响；应用Western blot检测SLBP的表达水平观察YSV对组蛋白mRNA加工的影响。

So in fact, if they senesce just a tiny tiny bit over time -- that is, if their half-life gets shorter, very very slowly -- we wouldn't actually be able to tell that this was happening in the time that we took our measurements, because the acceleration in the rate of atoms decaying (relative, of course, to the number that had not decayed already, which is always decreasing) would be too tiny to be statistically detectable.

所以在事实上，如果它们随时间衰老得只那么一点点，—就是说，如果它们的半衰期缩短得非常慢—那么我们实际上不可能知道，在我们测量期间发生过衰减，因为原子衰减的速率加速得太小，统计学上检测不出（当然，是相对于不曾衰减的数目而言，不曾衰减的原子数目总是在减少）。

Objective: To determine the numerical value of light dense of sodium salicylate by colorimetric analysis, and calculate its plasma half life.

目的：用比色法测定水杨酸钠的光密度值，并计算血浆半衰期。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。