Methods The effects of three vasodilators on the potassium chloride, norepinephrine concentration-response curves and precontracted rabbit aorta were investigated.

方法以离体兔主动脉条观察该三种血管舒张药对氯化钾、去甲肾上腺素量效曲线及预收缩血管的影响。

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Objective: to further study concentration-response relationship between daily mortality and particulate air pollution, to provide scientific basis for making policy.

目的：研究颗粒物空气污染与居民每日死亡率暴露-反应关系，为环境决策提供科学依据。

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In response to the appearance of such variants in the cell population the concentration of the toxic chemical in the growth medium is increased, thus keeping the selection pressure constant.

为应对细胞污染中出现的变异，有毒物质的浓度是逐步增加的，以此保证筛选力度的稳定。

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"These economic attributes, when combined with media concentration, endanger democracy, " intoned a collection of self-appointed media watchdog groups in a response to another FCC filing last December that would lift the restriction against combinations of newspapers and broadcast outfits in the same market.

FORBES: Free the Airwaves