半衰期

Demerol in neonates has a half life of 13 hours. Its potent metabolites have a half life of 62 hours!

德美罗Demerol，呱替啶(麻醉镇静剂在新生儿体内的半衰期是13个小时，它的有效代谢物的半衰期则长达62个小时！

The half-life day of HCH, DDT and chlorpyrifos was 27～32, 27～33 and 22～24 respectively and the residue were detected in the substrates and fruitbodies when fungi were inoculated to the substrated, There were no cypermethrin detected in the fruitbodies, and it's half-life day in the substrate was 19～20. Carbendazim used for control germina was also detected in the substrates and fruitbodies with a half-life from 19 days to 20 days. Because of it's short half-life (2 days to 4 days), the degradation of Chlorothalonil in substrates and fruitbodie were quickly and no chlorothanonil were detected both in the substrates and fruitbodies when harves.

在接菌情况下，HCH、DDT和毒死蜱等杀虫剂在食用菌子实体和培养料中都有残留，培养料中的降解半衰期分别为27～32天、27～33天和22～24天；氯氰菊酯在培养料中的降解半衰期为19～20天，但在子实体中没有残留；多菌灵是防治食用菌病害的常用杀菌剂，在培养料和子实体中也都有残留，并且培养料中的降解半衰期为19～20天；百菌清极易降解，在培养料和子实体都没有残留，在培养料中的降解半衰期仅为2～4天。

When 500 g/L iprodione was applied on greengrocery by 1000 times, the original residues were 41.04 mg/kg at open field and 33.15 mg/kg in greenhouse. Fourteen days after spraying, the residues were 1.34 mg/kg and 1.53 mg/kg at open field and in greenhouse, with half-lives of 1.98 and 2.45 days, respectively.

喷施500 g/L的异菌脲悬浮剂1 000倍后，异菌脲在露地青菜上原始沉积量为41.04 mg/kg，药后14 d残留量为1.34 mg/kg，消解率达到96.7%，半衰期为1.98 d，在大棚青菜上的原始沉积量为33.15 mg/kg，药后14 d残留量为1.53 mg/kg，消解率达到95.4%，半衰期为2.45 d，两者无明显差异。

It is concluded that the half-life of ozone in oxygen is much longer than in atmosphere in evidence.

实验结果还表明，臭氧在氧气中的半衰期显著大于在空气中的半衰期。

The results indicated that the degradation process of nicotine with no-induced strain DN2 followed inverse S-shaped curve, and degradation process of nicotine with induced cells of DN2 followed Eckenfelder mode. The half life of nicotine degradation was 17.43 h and 4.10 h, respectively.

结果表明，未经烟碱诱导的降解曲线呈倒S曲线，半衰期为17.43 h；经烟碱诱导的降解曲线符合Eckenfelder动力学模型，半衰期为4.10 h。

Pharmacodynamic parameters were calculated as follows: Tmax 0.74 h, C max 0.92 μg·mL-1, t 1/2α 0.68 h, t 1/2β 20.46 h, V/F 87.39 mL, CL 5.85 mL·h -1 (0.10 mL·min -1). On the other hand, after oral administration AA-I was rapidly distributed to all the viscera or tissue, whose peak appeared in 5 minutes and the vallecula was from 24 to 48 hours.

经拟合其特征符合血管外给药二室模型，所得参数显示：口服AA-I在 0 。74h达峰，达峰浓度 0.92mg·L-1，分布半衰期( t 1/ 2α) 0.6 8h ，消除半衰期( t 1/2β) 20.46h ，表观分布容积 87.39mL ，总清除率CL 5 。85mL·h-1(0.10mL·min-1)。

The results indicate that there is the significant linear correlation between the decoloration value and half-time and molecular descriptors, especially MW/S and number of azonic groups of azo dyes. Moreover, a QSPR model of azo dyes was achieved and used for calculation of predicted decoloration value and half-time of the dyes.

结果表明，染料分子结构描述符MW/S值、芳香环数目偶氮基数目和与I/O值与脱色率和半衰期之间存在着较好的线性相关性，其中MW/S值和偶氮基数目对脱色率和半衰期的贡献最为显著；所获得的QSPR定量关系模型可用于计算和估计水溶性阴离子偶氮染料的理论脱色率和半衰期。

Blood samples were collected at 0, 5, 10, 15, 30, 45 minutes and 1, 1.5, 2, 3 hours after the drug was given. Serum concentrations of penicillin G were determined by microbiological method. A computer program was used to determine the pharmacokinetic parameters for the blood concentration- time data by compart...

以电子计算机程序处理血药浓度—时间数据，血药浓度随时间变化符合二室开放模型，所得主要动力学参数为：分布半衰期(t1/2α)0.14±0.03h；消除半衰期(t1/2β)0.70±0.21h；表观分布容积0.696±0.141 l/kg；体清除率11.67±1.02 ml/；药时曲线下面积21.57±1.93h·IU/ml，本文还根据单剂量给药参数推算给药方案，供兽医临床参考。

Chapter three is the degradation of Abamectin in soils. The results show:(1) The decomposition of Abamectin is fastest in Aquic Cambosols while slowest in Udic Cambosols in five kinds of different soils.(2) Organic matter content in soil is the most important factor which influences the degradation half-life of Abamectin in soil, and their relative coefficient arrives at 0.9323, but pH value, total nitrogen, CEC and field maximum moisture capacity correlate little.(3) Soil organic matter, soil temperature and pesticide concentration can obviously affect Abamectin degradation in soil, in addition, the degradation half-life of Abamectin in sterilized soil is far more than that in non-sterilized soil, which maybe contributes to microorganism in soil. Chapter four is the microbial degradation of Abamectin.

第三章研究了阿维菌素在土壤中的降解，结果表明：(1)五种不同类型土壤中，阿维菌素在潮湿雏形土中降解最快，而在湿润雏形土中降解最慢；(2)土壤有机质含量与阿维菌素半衰期相关性较强，相关系数为0.9323，而土壤酸碱度、总氮含量、阳离子交换量和田间最大持水量等因子与阿维菌素半衰期相关性较小，说明影响阿维菌素在土壤中降解的最主要因子为有机质含量；(3)土壤有机质、土壤温度和农药浓度等因素对阿维菌素在土壤中的降解有较大影响，此外灭菌条件下其降解半衰期远大于未灭菌时的半衰期，这表明阿维菌素在土壤中的降解可能和土壤微生物有关。

The result shows that when HPLC adopts 254 nm as scan wavelength, and the mixture of acetonitrile and water according to appropriate proportion as flowing phase, the parameters such as accuracy, repetition and precision et al for the method are all good to satisfy the essential rules of pesticide residue determination.Chapter three is the degradation of Abamectin in soils. The results show:(1) The decomposition of Abamectin is fastest in Aquic Cambosols while slowest in Udic Cambosols in five kinds of different soils.

第三章研究了阿维菌素在土壤中的降解，结果表明：(1)五种不同类型土壤中，阿维菌素在潮湿雏形土中降解最快，而在湿润雏形土中降解最慢；(2)土壤有机质含量与阿维菌素半衰期相关性较强，相关系数为0.9323，而土壤酸碱度、总氮含量、阳离子交换量和田间最大持水量等因子与阿维菌素半衰期相关性较小，说明影响阿维菌素在土壤中降解的最主要因子为有机质含量：(3)土壤有机质、土壤温度和农药浓度等因素对阿维菌素在土壤中的降解有较大影响，此外灭菌条件下其降解半衰期远大于未灭菌时的半衰期，这表明阿维菌素在土壤中的降解可能和土壤微生物有关。

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。