目的：建立HPLC-Protein A定量检测贝伐珠单抗的方法,用于该单抗生产过程的含量测定和质量控制。方法：采用Agilent Bio-Monolith Protein A Column（5.2 mm×4.95 mm,0.10 m L）色谱柱,以PBS（含0.12 mol·L-1氯化钠,p H 7.4...目的：建立HPLC-Protein A定量检测贝伐珠单抗的方法,用于该单抗生产过程的含量测定和质量控制。方法：采用Agilent Bio-Monolith Protein A Column（5.2 mm×4.95 mm,0.10 m L）色谱柱,以PBS（含0.12 mol·L-1氯化钠,p H 7.4）为流动相A,0.5 mol·L-1醋酸（p H 2.5）为流动相B。上样后用流动相A冲平,然后用流动相B进行洗脱,流速为1.0 m L·min-1,柱温为25℃,检测波长为280 nm。结果：以质量浓度为横坐标,峰面积为纵坐标绘制标准曲线,在0.078-10.0 mg·m L-1浓度范围内,R2〉0.999;回收率在98.32%-101.7%之间;批内精密度RSD≤1.5%;批间精密度RSD≤1.6%;检测限0.30μg,定量限0.90μg;在p H变化±0.2、流动相A中氯化钠浓度变化±10.0%、柱温变化±5.0℃、流速变化±20.0%条件下,峰面积相对标准差RSD为0.39%-1.0%;发酵液样品的保留时间为1.350 min,与对照品的保留时间一致;在18 h内,同一批发酵液共检测27次,峰面积的RSD为0.44%。结论：方法学验证结果显示HPLC-Protein A法可以用于贝伐珠单抗生产过程的含量测定和质量控制。展开更多
Objective To observe the effect of acupuncture on serum peptide YY(PYY)and nesfatin-1 in obese patients with insulin resistance.Methods Ninety-eight obese patients with insulin resistance were divided into a control g...Objective To observe the effect of acupuncture on serum peptide YY(PYY)and nesfatin-1 in obese patients with insulin resistance.Methods Ninety-eight obese patients with insulin resistance were divided into a control group and an observation group by the random number table method,with 49 cases in each group.The control group received exercise and dietary interventions,and the observation group received additional acupuncture treatment to the exercise and dietary interventions.The body mass index(BMI),body fat percentage,fasting insulin(FINS),fasting plasma glucose(FPG),homeostasis model assessment for insulin resistance(HOMA-IR),triglyceride(TG),total cholesterol(TC),and serum PYY and nesfatin-1 levels were compared before and after treatment.The efficacy was evaluated after treatment.Results The total effective rate was significantly higher in the observation group than in the control group(P<0.05).After treatment,the BMI,body fat percentage,and serum TG and TC levels decreased significantly in both groups(P<0.05),and were significantly lower in the observation group than those in the control group(P<0.05).The FINS,FPG,HOMA-IR,and serum PYY and nesfatin-1 levels of the control group were not significantly changed after treatment(P>0.05).The FINS,FPG and HOMA-IR of the observation group decreased significantly after treatment(P<0.05),and were lower than those in the control group(P<0.05).The serum PYY and nesfatin-1 levels of the observation group increased significantly after treatment(P<0.05),and were higher than those in the control group(P<0.05).Conclusion Based on exercise and dietary interventions,acupuncture is effective for obese patients with insulin resistance.It can reduce the BMI,body fat percentage,blood lipids,blood glucose,and serum insulin levels and improve insulin resistance.The action may be associated with the up-regulation of serum PYY and nesfatin-1.展开更多
We study electrically forced vibrations of a crystal plate of AT-cut quartz carrying a thin mass layer operating as a quartz crystal microbalance for mass sensing.The mass layer is imperfectly bonded to the crystal pl...We study electrically forced vibrations of a crystal plate of AT-cut quartz carrying a thin mass layer operating as a quartz crystal microbalance for mass sensing.The mass layer is imperfectly bonded to the crystal plate with their interface described by the so-called interface-slip model which allows a discontinuity of the tangential interface displacement.Mindlin’s equations for piezoelectric plates are used.An analytical solution is obtained.The electrical impedance is calculated.The effects of an elastic interface and a viscoelastic interface are examined.展开更多
文摘目的：建立HPLC-Protein A定量检测贝伐珠单抗的方法,用于该单抗生产过程的含量测定和质量控制。方法：采用Agilent Bio-Monolith Protein A Column（5.2 mm×4.95 mm,0.10 m L）色谱柱,以PBS（含0.12 mol·L-1氯化钠,p H 7.4）为流动相A,0.5 mol·L-1醋酸（p H 2.5）为流动相B。上样后用流动相A冲平,然后用流动相B进行洗脱,流速为1.0 m L·min-1,柱温为25℃,检测波长为280 nm。结果：以质量浓度为横坐标,峰面积为纵坐标绘制标准曲线,在0.078-10.0 mg·m L-1浓度范围内,R2〉0.999;回收率在98.32%-101.7%之间;批内精密度RSD≤1.5%;批间精密度RSD≤1.6%;检测限0.30μg,定量限0.90μg;在p H变化±0.2、流动相A中氯化钠浓度变化±10.0%、柱温变化±5.0℃、流速变化±20.0%条件下,峰面积相对标准差RSD为0.39%-1.0%;发酵液样品的保留时间为1.350 min,与对照品的保留时间一致;在18 h内,同一批发酵液共检测27次,峰面积的RSD为0.44%。结论：方法学验证结果显示HPLC-Protein A法可以用于贝伐珠单抗生产过程的含量测定和质量控制。
文摘Objective To observe the effect of acupuncture on serum peptide YY(PYY)and nesfatin-1 in obese patients with insulin resistance.Methods Ninety-eight obese patients with insulin resistance were divided into a control group and an observation group by the random number table method,with 49 cases in each group.The control group received exercise and dietary interventions,and the observation group received additional acupuncture treatment to the exercise and dietary interventions.The body mass index(BMI),body fat percentage,fasting insulin(FINS),fasting plasma glucose(FPG),homeostasis model assessment for insulin resistance(HOMA-IR),triglyceride(TG),total cholesterol(TC),and serum PYY and nesfatin-1 levels were compared before and after treatment.The efficacy was evaluated after treatment.Results The total effective rate was significantly higher in the observation group than in the control group(P<0.05).After treatment,the BMI,body fat percentage,and serum TG and TC levels decreased significantly in both groups(P<0.05),and were significantly lower in the observation group than those in the control group(P<0.05).The FINS,FPG,HOMA-IR,and serum PYY and nesfatin-1 levels of the control group were not significantly changed after treatment(P>0.05).The FINS,FPG and HOMA-IR of the observation group decreased significantly after treatment(P<0.05),and were lower than those in the control group(P<0.05).The serum PYY and nesfatin-1 levels of the observation group increased significantly after treatment(P<0.05),and were higher than those in the control group(P<0.05).Conclusion Based on exercise and dietary interventions,acupuncture is effective for obese patients with insulin resistance.It can reduce the BMI,body fat percentage,blood lipids,blood glucose,and serum insulin levels and improve insulin resistance.The action may be associated with the up-regulation of serum PYY and nesfatin-1.
基金supported by the National Natural Science Foundation of China (Grant Nos. 10932004, 11072116 and 10772087)the Doctoral Program Fund of Ministry of Education of China (Grant No. 20093305110003/JW)+1 种基金the Zhejiang Provincial Science Fund for Distinguished Young Scholars (Grant No. LR12A02001)the US Army Research laboratory/US Army Research Office (Grant No. W911NF-10-1-0293)
文摘We study electrically forced vibrations of a crystal plate of AT-cut quartz carrying a thin mass layer operating as a quartz crystal microbalance for mass sensing.The mass layer is imperfectly bonded to the crystal plate with their interface described by the so-called interface-slip model which allows a discontinuity of the tangential interface displacement.Mindlin’s equations for piezoelectric plates are used.An analytical solution is obtained.The electrical impedance is calculated.The effects of an elastic interface and a viscoelastic interface are examined.
