Instead of normally tackling electric circuits by virtue oI the Klrctllaott＇s theorem wnose aim is to uerlvc voxt^gc, electric current, and electric impedence, our aim in this paper is to derive the characteristic fr...Instead of normally tackling electric circuits by virtue oI the Klrctllaott＇s theorem wnose aim is to uerlvc voxt^gc, electric current, and electric impedence, our aim in this paper is to derive the characteristic frequency of a three-loop mesoscopic LC circuit with three mutual inductances, e.g., for the radiating frequency of the three-loop LC oscillator, we adopt the invariant eigen-operator （lEO） method to realize our aim.展开更多
A liquid chromatography tandem mass spectrometry (LC-MS/MS) based method was developed for the simultaneous monitoring plasma levels of Sitagliptin (STG) and Pioglitazone (PIO) for applicability to pharmacokinetic stu...A liquid chromatography tandem mass spectrometry (LC-MS/MS) based method was developed for the simultaneous monitoring plasma levels of Sitagliptin (STG) and Pioglitazone (PIO) for applicability to pharmacokinetic studies. The method was based on HPLC separation on the reversed phase Phenomenex Synergy C18 column (30 mm length, 4.6 mm internal diameter, and 4.0 μm particle size) at a temperature of 40?C using a binary gradient mobile phase consisting of methanol and 2 mM ammonium acetate buffer pH adjusted to 4.5 with acetic acid, at a flow rate of 1 mL?min?1. Tolbutamide was used as an internal standard. Detection of analytes was achieved with LC-MS/MS system in Multiple Reaction Monitoring (MRM) mode. The method was validated over concentration range of 10.98 - 2091.77 ng?mL?1 for SIT and 8.25 - 1571.63 ng?mL?1 for PIO and lower limit of quantification was 10.98 ng?mL?1 and 8.25 ng?mL?1 for STG and PIO respectively. Recoveries from spiked controls were within acceptance criteria for all the analytes and internal standard at all QC levels. Within batch and between batch accuracy for STG was found within 96.9% - 100.3% and for PIO was found within 100.0% - 104.3%. Within batch and between batch precision for STG was less than 3.1% CV (coefficient of variation) and for PIO was less than 5.3% CV at all concentrations levels. This method was successfully applied to monitor pharmacokinetics profile of both STG and PIO on simultaneous oral administration to rats. This method can be applicable for pharmacokinetic drug-drug interaction studies.展开更多
In this paper we present a filter-trust-region algorithm for solving LC1 unconstrained optimization problems which uses the second Dini upper directional derivative. We establish the global convergence of the algorith...In this paper we present a filter-trust-region algorithm for solving LC1 unconstrained optimization problems which uses the second Dini upper directional derivative. We establish the global convergence of the algorithm under reasonable assumptions.展开更多
Potential mutagenic impurities in Active Pharmaceutical Ingredient, Meropenem Trihydrate were assessed and a novel analytical method for their quantification was developed and validated. This Liquid Chromatographic me...Potential mutagenic impurities in Active Pharmaceutical Ingredient, Meropenem Trihydrate were assessed and a novel analytical method for their quantification was developed and validated. This Liquid Chromatographic method using High Resolution Mass Spectrometer (LC-HRMS) technique is proved to be suitable for simultaneous quantification of all ten identified impurities with required specificity, sensitivity, resolution, precision, accuracy, and other method characteristics as per ICH Guidelines. The acceptable limit of less than 2.9 μg/g was considered for evaluations, based on drug substance dosage and duration of treatment. The method stands most sensitive with a Limit of Detection of 0.35 μg/g, considering the challenge full acceptance criteria as per current regulatory standards.展开更多
Applying calculation method in alloy design should be an important tendency due to its characters of inexpensive cost, high efficiency and prediction. DOS calculations of AuSn, AsSn and SbSn Sn- based alloys have ...Applying calculation method in alloy design should be an important tendency due to its characters of inexpensive cost, high efficiency and prediction. DOS calculations of AuSn, AsSn and SbSn Sn- based alloys have been investigated by employing DV - Xa method, in which different cluster models were adopted to calculate electron structure.It is proved that some regulations must be taken into ac- count in order to carry out alloy design calculation successfully,which are described in this paper in detail.展开更多
目的探讨Salubrinal对大鼠脑缺血再灌注模型LC3-ⅡmRNA及LC3-Ⅱ/LC3-ⅠmRNA表达的影响。方法用线栓法建立大鼠大脑中动脉脑缺血(MCAO)缺血再灌注模型。大鼠随机分为假手术组、模型组、Salubrinal组(Sal组),各组又分为再灌6、12、24、72 ...目的探讨Salubrinal对大鼠脑缺血再灌注模型LC3-ⅡmRNA及LC3-Ⅱ/LC3-ⅠmRNA表达的影响。方法用线栓法建立大鼠大脑中动脉脑缺血(MCAO)缺血再灌注模型。大鼠随机分为假手术组、模型组、Salubrinal组(Sal组),各组又分为再灌6、12、24、72 h 4个亚组。各组于再灌相应时间点行神经功能缺损评分,并断头取脑行HE染色及Real time-PCR检测。结果神经功能缺损:与假手术组比较,模型组、Sal组各时间点均有神经功能缺损(P<0.01);与模型组比较,再灌24、72 h Sal组神经功能缺损评分降低(P<0.05)。HE染色:模型组神经元减少、缺失,细胞肿胀,部分破裂,细胞核固缩、偏移、深染,胶质细胞增生,经Salubrinal干预后,再灌各时间点神经元增多,胞膜较完整,核固缩现象较轻,水肿轻微。Real time-PCR检测:与假手术组比较,模型组、Sal组各指标于再灌各时间点均增高(P<0.01)。与模型组比,Sal组LC3-ⅡmRNA表达于再灌12、24、72 h下降明显(P<0.05);Sal组LC3-Ⅱ/LC3-ⅠmRNA于再灌后各时间点下降均明显(P<0.01)。结论 Salubrinal通过下调LC3-ⅡmRNA及LC3-Ⅱ/LC3-ⅠmRNA比值,对大鼠脑缺血再灌注损伤起保护作用。展开更多
基金Project supported by the National Natural Science Foundation of China(Grant No.11775208)
文摘Instead of normally tackling electric circuits by virtue oI the Klrctllaott＇s theorem wnose aim is to uerlvc voxt^gc, electric current, and electric impedence, our aim in this paper is to derive the characteristic frequency of a three-loop mesoscopic LC circuit with three mutual inductances, e.g., for the radiating frequency of the three-loop LC oscillator, we adopt the invariant eigen-operator （lEO） method to realize our aim.
文摘A liquid chromatography tandem mass spectrometry (LC-MS/MS) based method was developed for the simultaneous monitoring plasma levels of Sitagliptin (STG) and Pioglitazone (PIO) for applicability to pharmacokinetic studies. The method was based on HPLC separation on the reversed phase Phenomenex Synergy C18 column (30 mm length, 4.6 mm internal diameter, and 4.0 μm particle size) at a temperature of 40?C using a binary gradient mobile phase consisting of methanol and 2 mM ammonium acetate buffer pH adjusted to 4.5 with acetic acid, at a flow rate of 1 mL?min?1. Tolbutamide was used as an internal standard. Detection of analytes was achieved with LC-MS/MS system in Multiple Reaction Monitoring (MRM) mode. The method was validated over concentration range of 10.98 - 2091.77 ng?mL?1 for SIT and 8.25 - 1571.63 ng?mL?1 for PIO and lower limit of quantification was 10.98 ng?mL?1 and 8.25 ng?mL?1 for STG and PIO respectively. Recoveries from spiked controls were within acceptance criteria for all the analytes and internal standard at all QC levels. Within batch and between batch accuracy for STG was found within 96.9% - 100.3% and for PIO was found within 100.0% - 104.3%. Within batch and between batch precision for STG was less than 3.1% CV (coefficient of variation) and for PIO was less than 5.3% CV at all concentrations levels. This method was successfully applied to monitor pharmacokinetics profile of both STG and PIO on simultaneous oral administration to rats. This method can be applicable for pharmacokinetic drug-drug interaction studies.
基金Supported by CERG: CityU 101005 of the Government of Hong Kong SAR, Chinathe National Natural ScienceFoundation of China, the Specialized Research Fund of Doctoral Program of Higher Education of China (Grant No.20040319003)the Natural Science Fund of Jiangsu Province of China (Grant No. BK2006214)
文摘In this paper we present a filter-trust-region algorithm for solving LC1 unconstrained optimization problems which uses the second Dini upper directional derivative. We establish the global convergence of the algorithm under reasonable assumptions.
文摘Potential mutagenic impurities in Active Pharmaceutical Ingredient, Meropenem Trihydrate were assessed and a novel analytical method for their quantification was developed and validated. This Liquid Chromatographic method using High Resolution Mass Spectrometer (LC-HRMS) technique is proved to be suitable for simultaneous quantification of all ten identified impurities with required specificity, sensitivity, resolution, precision, accuracy, and other method characteristics as per ICH Guidelines. The acceptable limit of less than 2.9 μg/g was considered for evaluations, based on drug substance dosage and duration of treatment. The method stands most sensitive with a Limit of Detection of 0.35 μg/g, considering the challenge full acceptance criteria as per current regulatory standards.
文摘Applying calculation method in alloy design should be an important tendency due to its characters of inexpensive cost, high efficiency and prediction. DOS calculations of AuSn, AsSn and SbSn Sn- based alloys have been investigated by employing DV - Xa method, in which different cluster models were adopted to calculate electron structure.It is proved that some regulations must be taken into ac- count in order to carry out alloy design calculation successfully,which are described in this paper in detail.
文摘目的探讨Salubrinal对大鼠脑缺血再灌注模型LC3-ⅡmRNA及LC3-Ⅱ/LC3-ⅠmRNA表达的影响。方法用线栓法建立大鼠大脑中动脉脑缺血(MCAO)缺血再灌注模型。大鼠随机分为假手术组、模型组、Salubrinal组(Sal组),各组又分为再灌6、12、24、72 h 4个亚组。各组于再灌相应时间点行神经功能缺损评分,并断头取脑行HE染色及Real time-PCR检测。结果神经功能缺损:与假手术组比较,模型组、Sal组各时间点均有神经功能缺损(P<0.01);与模型组比较,再灌24、72 h Sal组神经功能缺损评分降低(P<0.05)。HE染色:模型组神经元减少、缺失,细胞肿胀,部分破裂,细胞核固缩、偏移、深染,胶质细胞增生,经Salubrinal干预后,再灌各时间点神经元增多,胞膜较完整,核固缩现象较轻,水肿轻微。Real time-PCR检测:与假手术组比较,模型组、Sal组各指标于再灌各时间点均增高(P<0.01)。与模型组比,Sal组LC3-ⅡmRNA表达于再灌12、24、72 h下降明显(P<0.05);Sal组LC3-Ⅱ/LC3-ⅠmRNA于再灌后各时间点下降均明显(P<0.01)。结论 Salubrinal通过下调LC3-ⅡmRNA及LC3-Ⅱ/LC3-ⅠmRNA比值,对大鼠脑缺血再灌注损伤起保护作用。
