INTRODUCTIONThe prevalence of hyperuricenlia （HUA） has increased in China in the recent years in relation to socioeconomic developments and changing lifestyles and diets, with a trend toward onset at younger age. HU...INTRODUCTIONThe prevalence of hyperuricenlia （HUA） has increased in China in the recent years in relation to socioeconomic developments and changing lifestyles and diets, with a trend toward onset at younger age. HUA has become the second most common metabolic disease after diabetes mellitus. Like gout, HUA is also associated with the occurrence and progression of disorders of the urinary, endocrine, metabolic, cardio-cerebrovascular, and other systems.展开更多
The core-shell 2,4,6,8,10,12-Hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane/2,4,6-Trinitrotoluene(CL-20/TNT)composite was prepared by spray-drying method in which sensitive high energy explosive(CL-20)was coated with in...The core-shell 2,4,6,8,10,12-Hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane/2,4,6-Trinitrotoluene(CL-20/TNT)composite was prepared by spray-drying method in which sensitive high energy explosive(CL-20)was coated with insensitive explosive(TNT).The structure and properties of different formulations of CL-20/TNT composite and CL-20/TNT mixture were characterized by scanning electron microscopy(SEM),Transmission electron microscopy(TEM),Laser particle size analyzer,X-ray photoelectron spectroscopy(XPS),X-ray diffraction(XRD),differential scanning calorimetry(DSC),impact sensitivity test and detonation performance.The results of SEM,TEM,XPS and XRD show that e-CL-20 particles are coated by TNT.When the ratio of CL-20/TNT is 75/25,core-shell structure is well formed,and thickness of the shell is about 20e30 nm.And the analysis of heat and impact show that with the increase of TNT content,the TNT coating on the core-shell composite material can not only catalyze the thermal decomposition of core material(CL-20),but also greatly reduce the impact sensitivity.Compared with the CL-20/TNT mixture(75/25)at the same ratio,the characteristic drop height of core-shell CL-20/TNT composite(75/25)increased by 47.6%and the TNT coating can accelerate the nuclear decomposition in the CL-20/TNT composites.Therefore,the preparation of the core-shell composites can be regarded as a unique means,by which the composites are characterized by controllable decomposition rate,high energy and excellent mechanical sensitivity and could be applied to propellants and other fields.展开更多
建立太子参药材中14种真菌毒素的同步分析方法,分析真菌毒素的污染状况,为监测中药材质量和用药安全提供技术指导。以80%乙腈作为提取溶剂,振荡提取1 h,经改良QuEChERS净化剂(0.1 g PSA+0.3 g C_(18)+0.3 g无水MgSO;)净化;采用Waters HS...建立太子参药材中14种真菌毒素的同步分析方法,分析真菌毒素的污染状况,为监测中药材质量和用药安全提供技术指导。以80%乙腈作为提取溶剂,振荡提取1 h,经改良QuEChERS净化剂(0.1 g PSA+0.3 g C_(18)+0.3 g无水MgSO;)净化;采用Waters HSS T3色谱柱(2.1 mm×100 mm,1.8μm)分离,以0.1%甲酸水和乙腈梯度洗脱,多反应监测模式(MRM)扫描,分析26份太子参样品中真菌毒素污染状况。所建方法回收率在82.17%~113.6%,RSD<7%,定量限为0.019~0.976μg·kg^(-1);26批药材中14种真菌毒素的检出率为53.85%,其中杂色曲霉素(ST)检出率最高、其次为玉米赤霉烯酮(ZEN)、黄曲霉毒素G_(2)(AFG_(2))、伏马毒素B_(1)(FB_(1))、HT-2毒素、雪腐镰刀菌烯醇(NIV),检出率分别为38.46%、26.92%、23.08%、11.54%、11.54%、7.69%,污染范围分别在1.48~69.65、0.11~31.05、0.11~0.66、0.28~0.83、20.86~42.56、0.46~1.84μg·kg^(-1)。建立的14种真菌毒素药材检测方法准确、快捷、可靠,研究结果对指导中药材外源性真菌污染的监测和防控具有非常重要的现实意义。展开更多
The level of the slag entrapment in mold involves the submerged nozzle immersion depth,the electromagnetic stirring intensity and other factors;this article has studied the relations between the slag entrapment behavi...The level of the slag entrapment in mold involves the submerged nozzle immersion depth,the electromagnetic stirring intensity and other factors;this article has studied the relations between the slag entrapment behavior and the above factors by using of the water model.The results show that the surface velocity in meniscus increases with the increasing of stirring intensity and the decreasing of submerged nozzle immersion depth.When the submerged nozzle immersion depth is shallower,and the stirring intensity is high,the interface turbulence of the molten steel and slag is more severe,slag entrapment may occur in the extreme state.In order to avoid the slag entrapment in the working condition,the submerged nozzle immersion depth should be increased from 85;0mm to 100mm,or the electric current of the electromagnetic stirring should be reduced from 320A to 295A.展开更多
As a polyphagous pest, Tetranychus cinnabarinus has the ability to overcome the defense of various hosts, and causes severe losses to various economically important crops. Since the interaction between pest and host p...As a polyphagous pest, Tetranychus cinnabarinus has the ability to overcome the defense of various hosts, and causes severe losses to various economically important crops. Since the interaction between pest and host plants is a valuable clue to investigate potential ways for pest management, we intend to identify the key genes of T. cinnabarinus for its adaption on cotton, then, with RNA interference （RNAi） and transgenic technology, construct a transgenic cotton strain to interfere with this process, and evaluate the effect of this method on the management of the mites. The difference of gene expression of T. cinnabarinus was analyzed when it was transferred to a new host （from cowpea to cotton） through high-throughput sequencing, and a number of differentially expressed genes involved in detoxification, digestion and specific processes during the development were classified. From them, a P450 gene CYP392A4 with high abundance and prominent over-expression on the cotton was selected as a candidate. With transgenic technology, cotton plants expressing double-stranded RNA of CYP392A4 were constructed. Feeding experiments showed that it can decrease the expression of the target gene, result in the reduction of reproductive ability of the mites, and the population of T. cinnabarinus showed an apparent fitness cost on the transgenic cotton. These results provide a new approach to restrict the development of mite population on the host. It is also a useful attempt to control piercing sucking pests through RNAi and transgenic technology.展开更多
Antimony selenide(Sb2Se3) films are widely used in phase change memory and solar cells due to their stable switching effect and excellent photovoltaic properties. These properties of the films are affected by the film...Antimony selenide(Sb2Se3) films are widely used in phase change memory and solar cells due to their stable switching effect and excellent photovoltaic properties. These properties of the films are affected by the film thickness. A method combining the advantages of Levenberg–Marquardt method and spectral fitting method(LM–SFM) is presented to study the dependence of refractive index(RI), absorption coefficient, optical band gap, Wemple–Di Domenico parameters, dielectric constant and optical electronegativity of the Sb2Se3films on their thickness. The results show that the RI and absorption coefficient of the Sb2Se3films increase with the increase of film thickness, while the optical band gap decreases with the increase of film thickness. Finally, the reasons why the optical and electrical properties of the film change with its thickness are explained by x-ray diffractometer(XRD), energy dispersive x-ray spectrometer(EDS), Mott–Davis state density model and Raman microstructure analysis.展开更多
文摘INTRODUCTIONThe prevalence of hyperuricenlia （HUA） has increased in China in the recent years in relation to socioeconomic developments and changing lifestyles and diets, with a trend toward onset at younger age. HUA has become the second most common metabolic disease after diabetes mellitus. Like gout, HUA is also associated with the occurrence and progression of disorders of the urinary, endocrine, metabolic, cardio-cerebrovascular, and other systems.
文摘The core-shell 2,4,6,8,10,12-Hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane/2,4,6-Trinitrotoluene(CL-20/TNT)composite was prepared by spray-drying method in which sensitive high energy explosive(CL-20)was coated with insensitive explosive(TNT).The structure and properties of different formulations of CL-20/TNT composite and CL-20/TNT mixture were characterized by scanning electron microscopy(SEM),Transmission electron microscopy(TEM),Laser particle size analyzer,X-ray photoelectron spectroscopy(XPS),X-ray diffraction(XRD),differential scanning calorimetry(DSC),impact sensitivity test and detonation performance.The results of SEM,TEM,XPS and XRD show that e-CL-20 particles are coated by TNT.When the ratio of CL-20/TNT is 75/25,core-shell structure is well formed,and thickness of the shell is about 20e30 nm.And the analysis of heat and impact show that with the increase of TNT content,the TNT coating on the core-shell composite material can not only catalyze the thermal decomposition of core material(CL-20),but also greatly reduce the impact sensitivity.Compared with the CL-20/TNT mixture(75/25)at the same ratio,the characteristic drop height of core-shell CL-20/TNT composite(75/25)increased by 47.6%and the TNT coating can accelerate the nuclear decomposition in the CL-20/TNT composites.Therefore,the preparation of the core-shell composites can be regarded as a unique means,by which the composites are characterized by controllable decomposition rate,high energy and excellent mechanical sensitivity and could be applied to propellants and other fields.
文摘The level of the slag entrapment in mold involves the submerged nozzle immersion depth,the electromagnetic stirring intensity and other factors;this article has studied the relations between the slag entrapment behavior and the above factors by using of the water model.The results show that the surface velocity in meniscus increases with the increasing of stirring intensity and the decreasing of submerged nozzle immersion depth.When the submerged nozzle immersion depth is shallower,and the stirring intensity is high,the interface turbulence of the molten steel and slag is more severe,slag entrapment may occur in the extreme state.In order to avoid the slag entrapment in the working condition,the submerged nozzle immersion depth should be increased from 85;0mm to 100mm,or the electric current of the electromagnetic stirring should be reduced from 320A to 295A.
文摘As a polyphagous pest, Tetranychus cinnabarinus has the ability to overcome the defense of various hosts, and causes severe losses to various economically important crops. Since the interaction between pest and host plants is a valuable clue to investigate potential ways for pest management, we intend to identify the key genes of T. cinnabarinus for its adaption on cotton, then, with RNA interference （RNAi） and transgenic technology, construct a transgenic cotton strain to interfere with this process, and evaluate the effect of this method on the management of the mites. The difference of gene expression of T. cinnabarinus was analyzed when it was transferred to a new host （from cowpea to cotton） through high-throughput sequencing, and a number of differentially expressed genes involved in detoxification, digestion and specific processes during the development were classified. From them, a P450 gene CYP392A4 with high abundance and prominent over-expression on the cotton was selected as a candidate. With transgenic technology, cotton plants expressing double-stranded RNA of CYP392A4 were constructed. Feeding experiments showed that it can decrease the expression of the target gene, result in the reduction of reproductive ability of the mites, and the population of T. cinnabarinus showed an apparent fitness cost on the transgenic cotton. These results provide a new approach to restrict the development of mite population on the host. It is also a useful attempt to control piercing sucking pests through RNAi and transgenic technology.
基金supported by the National Natural Science Foundation of China (Grant Nos. 62075109, 62135011, 62075107, and 61935006)K. C. Wong Magna Fund in Ningbo University。
文摘Antimony selenide(Sb2Se3) films are widely used in phase change memory and solar cells due to their stable switching effect and excellent photovoltaic properties. These properties of the films are affected by the film thickness. A method combining the advantages of Levenberg–Marquardt method and spectral fitting method(LM–SFM) is presented to study the dependence of refractive index(RI), absorption coefficient, optical band gap, Wemple–Di Domenico parameters, dielectric constant and optical electronegativity of the Sb2Se3films on their thickness. The results show that the RI and absorption coefficient of the Sb2Se3films increase with the increase of film thickness, while the optical band gap decreases with the increase of film thickness. Finally, the reasons why the optical and electrical properties of the film change with its thickness are explained by x-ray diffractometer(XRD), energy dispersive x-ray spectrometer(EDS), Mott–Davis state density model and Raman microstructure analysis.
