现在，《化学毒理学研究》杂志上的一项研究表明，汞合金填充物的毒性可能会随着时间的流逝而消失。
Now a study in the journal Chemical Research in Toxicology indicates that mercury fillings actually lose their toxic potential over time.
她说，对于铜来说，半数致死浓度lc50(一定时间内受试动物半数死亡的毒物浓度)随温度减弱-这就意味着毒性增加。
For copper, she said, the LC50 (the concentration lethal to half of any given species over a certain time) decreases with temperature - meaning that toxicity increases.
相较年轻患者普遍采用的治疗方法而言，化疗的毒性较低且时间较短。 新的化疗手段伴随着直肠癌患者存活率的改善同时出现。
New chemotherapy agents appear associated with improvements in survival time for patients with metastastic colorectal cancer .
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