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1)  median effective concentration
半数有效浓度
1.
Objective To determine the median effective concentration (EC 50 ) of ropivacaine and bupivacaine for postoperative epidural analgesia, and compare the efficacy of the 2 analgesics.
目的通过序贯试验法测定罗哌卡因和布比卡因术后硬膜外镇痛的半数有效浓度(EC50),比较两者用于术后硬膜外镇痛的相对效能。
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2)  half effective target effect-site concentration
半数有效效应室浓度
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3)  Cp_50
半数有效血浆浓度
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4)  anesthetic 50 percent effective dose
半数麻醉有效浓度
1.
Objective To establish a method for determining the anesthetic 50 percent effective dose (ED 50 ) of inhaled anesthetics on fruit flies.
目的　建立测定果蝇吸入麻醉药半数麻醉有效浓度 (ED50 )的方法学。
5)  50%effective concentration
半效浓度
6)  Effective concentration
有效浓度
1.
According to the analysis of typical BOF slags,the activities of FeO and CaO in the slags were obtained from the iso activity diagrams of (CaO+MgO+MnO) (SiO 2+ P 2O 5) FeO n system,whereby the effective concentrations of CaO and FeO in BOF slag were determined.
针对几种典型转炉渣的成分分析 ,由FeOn (CaO +MgO +MnO) (SiO2 +P2 O5)等活度图回归出氧化铁和氧化钙的活度 ,以确定其有效浓度 。
2.
Chosen the right dosage and fumigation method,maintained the effective concentration of PH 3,respiration,grow and reproduction of microorganism and pest were inhibited.
采用合理的剂量和熏蒸方法,保持粮堆内较长时间的PH3有效浓度,抑制了玉米的呼吸强度和微生物、害虫的生长繁殖,确保了玉米长期安全储藏,保持了较好的储粮品质。
3.
The results showed that the concentration of PH 3 can maintain above the effective concentration for a period of time,and no insects were found more than 12 months.
本文采用磷化铝间歇熏蒸法 ,使粮堆内部各处PH3浓度在一定的时间内保持在有效浓度之上 ,无虫期超过 12个月 ,有效地防治了锈赤扁谷盗。
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补充资料：半数有效量
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性质：能使50%的个体产生阳性效果的剂量。

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