为研究兽药残留高通量检测方法,使用超高效液相色谱-四极杆飞行时间串联质谱(ultra performance liquid chromatography-quadrupole time of flight tandem mass spectrometry,UPLC-Q-TOF-MS/MS)对畜禽基质样品以及21种兽药标准品进行检...为研究兽药残留高通量检测方法,使用超高效液相色谱-四极杆飞行时间串联质谱(ultra performance liquid chromatography-quadrupole time of flight tandem mass spectrometry,UPLC-Q-TOF-MS/MS)对畜禽基质样品以及21种兽药标准品进行检测,得到各兽药标准品的保留时间和特征碎片离子质谱图等信息,获得各目标化合物的线性方程、相关系数、线性范围以及测定底限。利用GNPS(global natural products social molecular networking)网站进一步探究了兽药的二级质谱裂解规律,对化合物进行结构解析和确证,发现同一种类的兽药分子裂解规律存在相似性,可以借助兽药分子的二级质谱裂解碎片实现畜禽肉中兽药残留的快速高通量筛查。基于UPLC-Q-TOF-MS/MS及GNPS分子网络技术,在24个猪肉、鱼肉样品中检出10种抗生素阳性,其中有3种不包含在已建立的兽药标准品信息库中。结果表明,相比于常规检测方法,UPLC-Q-TOF-MS/MS结合GNPS分子网络技术可以快速、简便地实现畜禽肉中兽药残留检测,且能发现未知兽药。展开更多
目的系统评价FOLFIRINOX方案与白蛋白结合型紫杉醇联合吉西他滨(GNP)方案新辅助化疗用于治疗潜在可切除/局部晚期胰腺癌(BRPC/LAPC)的有效性和安全性,为临床治疗提供依据。方法通过计算机检索多个中英文数据库,时间范围设定为从建库时间...目的系统评价FOLFIRINOX方案与白蛋白结合型紫杉醇联合吉西他滨(GNP)方案新辅助化疗用于治疗潜在可切除/局部晚期胰腺癌(BRPC/LAPC)的有效性和安全性,为临床治疗提供依据。方法通过计算机检索多个中英文数据库,时间范围设定为从建库时间至2023年11月31日,收集FOLFIRINOX方案与GNP方案治疗BRPC/LAPC的有效性和安全性数据。采用Rev Man 5.3统计软件进行Meta分析。结果FOLFIRINOX组比GNP组的无进展生存期更长,但疾病进展发生率高于GNP组(P<0.05);两组在总生存、完全缓解、部分缓解、疾病稳定、客观缓解率、疾病控制率上的差异均无统计学意义(P>0.05)。FOLFIRINOX组的总体贫血、3~4级贫血、总体疲劳、3~4级疲劳发生率均低于GNP组(P<0.05);而3~4级腹泻、总体周围神经病变、3~4级周围神经病变发生率高于GNP组(P<0.05)。结论目前BRPC/LAPC的两种一线化疗方案比较,FOLFIRINOX方案比GNP方案的无进展生存期更长,但疾病进展发生率更高;FOLFIRINOX的毒副作用主要为贫血与疲劳,GNP的毒副作用主要为腹泻和周围神经病变。展开更多
This work uses refined first-order shear theory to analyze the free vibration and transient responses of double-curved sandwich two-layer shells made of auxetic honeycomb core and laminated three-phase polymer/GNP/fib...This work uses refined first-order shear theory to analyze the free vibration and transient responses of double-curved sandwich two-layer shells made of auxetic honeycomb core and laminated three-phase polymer/GNP/fiber surface subjected to the blast load.Each of the two layers that make up the double-curved shell structure is made up of an auxetic honeycomb core and two laminated sheets of three-phase polymer/GNP/fiber.The exterior is supported by a Kerr elastic foundation with three characteristics.The key innovation of the proposed theory is that the transverse shear stresses are zero at two free surfaces of each layer.In contrast to previous first-order shear deformation theories,no shear correction factor is required.Navier's exact solution was used to treat the double-curved shell problem with a single title boundary,while the finite element technique and an eight-node quadrilateral were used to address the other boundary requirements.To ensure the accuracy of these results,a thorough comparison technique is employed in conjunction with credible statements.The problem model's edge cases allow for this kind of analysis.The study's findings may be used in the post-construction evaluation of military and civil works structures for their ability to sustain explosive loads.In addition,this is also an important basis for the calculation and design of shell structures made of smart materials when subjected to shock waves or explosive loads.展开更多
The paper conducts order relative analysis of GNP per capita calculated according to exchange rates and those according to PPPs of 26 countries published in World Development Report prepared by World Bank. It proves t...The paper conducts order relative analysis of GNP per capita calculated according to exchange rates and those according to PPPs of 26 countries published in World Development Report prepared by World Bank. It proves that there is a positive order relative relationship between the two indicators. In the meantime, the author also establishes the indicator ρ which can show comprehensively the economic power and welfare of each country and thereby indicates the characteristics of exchange rate and living level of each country.展开更多
文摘为研究兽药残留高通量检测方法,使用超高效液相色谱-四极杆飞行时间串联质谱(ultra performance liquid chromatography-quadrupole time of flight tandem mass spectrometry,UPLC-Q-TOF-MS/MS)对畜禽基质样品以及21种兽药标准品进行检测,得到各兽药标准品的保留时间和特征碎片离子质谱图等信息,获得各目标化合物的线性方程、相关系数、线性范围以及测定底限。利用GNPS(global natural products social molecular networking)网站进一步探究了兽药的二级质谱裂解规律,对化合物进行结构解析和确证,发现同一种类的兽药分子裂解规律存在相似性,可以借助兽药分子的二级质谱裂解碎片实现畜禽肉中兽药残留的快速高通量筛查。基于UPLC-Q-TOF-MS/MS及GNPS分子网络技术,在24个猪肉、鱼肉样品中检出10种抗生素阳性,其中有3种不包含在已建立的兽药标准品信息库中。结果表明,相比于常规检测方法,UPLC-Q-TOF-MS/MS结合GNPS分子网络技术可以快速、简便地实现畜禽肉中兽药残留检测,且能发现未知兽药。
文摘目的系统评价FOLFIRINOX方案与白蛋白结合型紫杉醇联合吉西他滨(GNP)方案新辅助化疗用于治疗潜在可切除/局部晚期胰腺癌(BRPC/LAPC)的有效性和安全性,为临床治疗提供依据。方法通过计算机检索多个中英文数据库,时间范围设定为从建库时间至2023年11月31日,收集FOLFIRINOX方案与GNP方案治疗BRPC/LAPC的有效性和安全性数据。采用Rev Man 5.3统计软件进行Meta分析。结果FOLFIRINOX组比GNP组的无进展生存期更长,但疾病进展发生率高于GNP组(P<0.05);两组在总生存、完全缓解、部分缓解、疾病稳定、客观缓解率、疾病控制率上的差异均无统计学意义(P>0.05)。FOLFIRINOX组的总体贫血、3~4级贫血、总体疲劳、3~4级疲劳发生率均低于GNP组(P<0.05);而3~4级腹泻、总体周围神经病变、3~4级周围神经病变发生率高于GNP组(P<0.05)。结论目前BRPC/LAPC的两种一线化疗方案比较,FOLFIRINOX方案比GNP方案的无进展生存期更长,但疾病进展发生率更高;FOLFIRINOX的毒副作用主要为贫血与疲劳,GNP的毒副作用主要为腹泻和周围神经病变。
文摘This work uses refined first-order shear theory to analyze the free vibration and transient responses of double-curved sandwich two-layer shells made of auxetic honeycomb core and laminated three-phase polymer/GNP/fiber surface subjected to the blast load.Each of the two layers that make up the double-curved shell structure is made up of an auxetic honeycomb core and two laminated sheets of three-phase polymer/GNP/fiber.The exterior is supported by a Kerr elastic foundation with three characteristics.The key innovation of the proposed theory is that the transverse shear stresses are zero at two free surfaces of each layer.In contrast to previous first-order shear deformation theories,no shear correction factor is required.Navier's exact solution was used to treat the double-curved shell problem with a single title boundary,while the finite element technique and an eight-node quadrilateral were used to address the other boundary requirements.To ensure the accuracy of these results,a thorough comparison technique is employed in conjunction with credible statements.The problem model's edge cases allow for this kind of analysis.The study's findings may be used in the post-construction evaluation of military and civil works structures for their ability to sustain explosive loads.In addition,this is also an important basis for the calculation and design of shell structures made of smart materials when subjected to shock waves or explosive loads.
文摘The paper conducts order relative analysis of GNP per capita calculated according to exchange rates and those according to PPPs of 26 countries published in World Development Report prepared by World Bank. It proves that there is a positive order relative relationship between the two indicators. In the meantime, the author also establishes the indicator ρ which can show comprehensively the economic power and welfare of each country and thereby indicates the characteristics of exchange rate and living level of each country.
