Pharmacokinetics of doxycycline in sheep after intravenous and oral administration

The pharmacokinetics of doxycycline were investigated in sheep after oral (PO) and intravenous (IV) administration. The IV data were best described using a 2- (n = 5) or 3- (n = 6) compartmental open model. Mean pharmacokinetic parameters obtained using a 2-compartmental model included a volume of distribution at steady-state (V_ss) of 1.759 ± 0.3149 L/kg, a total clearance (Cl) of 3.045 ± 0.5264 mL/kg/min and an elimination half-life (t_1/2β) of 7.027 ± 1.128 h. Comparative values obtained from the 3-compartmental mean values were: V_ss of 1.801 ± 0.3429 L/kg, a Cl of 2.634 ± 0.6376 mL/kg/min and a t_1/2β of 12.11 ± 2.060 h. Mean residence time (MRT_0−∞) was 11.18 ± 3.152 h. After PO administration, the data were best described by a 2-compartment open model. The pharmacokinetic parameter mean values were: maximum plasma concentration (C_max), 2.130 ± 0.950 μg/mL; time to reach C_max (t_max), 3.595 ± 3.348 h, and absorption half-life (t_1/2k01), 36.28 ± 14.57 h. Non-compartmental parameter values were: C_max, 2.182 ± 0.9117 μg/mL; t_max, 3.432 ± 3.307 h; F, 35.77 ± 10.20%, and mean absorption time (MAT_0–∞), 25.55 ± 15.27 h. These results suggest that PO administration of doxycycline could be useful as an antimicrobial drug in sheep.     

基于数字图书馆的大学英语口语教学模式探究

大学生的英语口语水平普遍较低已成为困扰中国英语教学改革和学生英语学习的一个重要因素。如何提高大学生的英语口语水平已经成为英语教学实践中急需解决的问题。借鉴英语口语教学理论,探讨并提出了基于数字图书馆下的新型英语口语教学模式,并对这种新型英语教学模式的具体实施方案给出了明确的说明。     

一测多评法同时测定麻杏石甘口服液中3种成分含量

建立麻杏石甘口服液中盐酸麻黄碱、盐酸伪麻黄碱和苦杏仁苷3种成分含量的一测多评方法。以盐酸麻黄碱为内参物,建立盐酸伪麻黄碱和苦杏仁苷与盐酸麻黄碱的相对校正因子,分别采用外标法与一测多评法测定3种成分的含量,比较两种方法测得结果的差异,验证一测多评方法的可行性。盐酸麻黄碱与盐酸伪麻黄碱、苦杏仁苷的相对校正因子分别为1.233和2.741,一测多评法与外标法测定结果无显著性差异,相对误差小于0.3%。一测多评法运用于麻杏石甘口服液的含量测定准确可行。     

党参多糖口服液对大鼠的长期毒性研究

为了解长期使用党参多糖口服液对机体的毒性反应,以便指导临床长期用药的安全性。大鼠灌胃给药党参多糖口服液,在给药4周和停药2周内,观察大鼠一般行为活动等情况,进行血液学、血液生化学和主要脏器病理学检查,考察党参多糖口服液给药的长期毒性。结果显示,各组大鼠在给药期间和恢复期内,一般情况和行为活动、粪便等均无异常变化,血液学、血液生化学和主要脏器病理学检查,均无明显变化。因此,连续大鼠灌胃给药党参多糖口服液未见明显毒性反应,说明党参多糖口服液具有较高的临床用药安全性。