检索结果-南通市图书馆

Effects of halobenzoquinone and haloacetic acid water disinfection byproducts on human neural stem cells

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2017年第8期29卷 239-249页

作者： Katherine z.Fu Jinhua Li Sai Vemula Birget Moe xing-Fang Li Division of Analytical&Environmental Toxicology Department of Laboratory Medicine&PathologyFaculty of Medicine&DentistryUniversity of Alberta Alberta Centre for Toxicology Department of Physiology&PharmacologyFaculty of MedicineUniversity of Calgary

Human neural stem cells（h NSCs） are a useful tool to assess the developmental effects of various environmental contaminants; however, the application of h NSCs to evaluate water disinfection byproducts（DBps） is scarce. Comprehensive toxicological results are essential to the prioritization of DBps for further testing and regulation. Therefore, this study examines the effects of DBps on the proliferation and differentiation of h NSCs. prior to DBp treatment, characteristic protein markers of h NSCs from passages 3 to 6 were carefully examined and it was determined that h NSCs passaged 3 or 4 times maintained stem cell characteristics and can be used for DBp analysis. Two regulated DBps, monobromoacetic acid（BAA） and monochloroacetic acid（CAA）, and two emerging DBps, 2,6-dibromo-1,4-benzoquinone（2,6-DBBQ） and 2,6-dichloro-1,4-benzoquinone（2,6-DCBQ）, were chosen for h NSC treatment. Both 2,6-DBBQ and 2,6-DCBQ induced cell cycle arrest at S-phase at concentrations up to 1 μmol/L. Comparatively, BAA and CAA at 0.5 μmol/L affected neural differentiation. These results suggest DBp-dependent effects on h NSC proliferation and differentiation. The DBp-induced cell cycle arrest and inhibition of normal h NSC differentiation demonstrate the need to assess the developmental neurotoxicity of DBps.

关键词： Disinfection byproducts Human neural stem cells Differentiation Halobenzoquinones Haloacetic acids Cell cycle arrest

Cyanobacterial bloom dynamics in Lake Taihu

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2015年第6期27卷 249-251页

作者： Katherine z. Fu Birget Moe xing-Fang Li X. Chris Le Division of Analytical and Environmental Toxicology Department of Laboratory Medicine and Pathology University of Alberta

Lake Taihu is the third largest freshwater lake in China and serves as an important drinking water source for the local populace;however,decades of excessive nutrient loading fueled by anthropogenic activities have resulted in hypertrophic conditions,promoting the annual formation of nuisance phytoplankton blooms（Chen et al.,2003;Duan et al.,2009）

关键词： Cyanobacteria Blue-green algae Microcystin Natural toxins Water quality Nutrients Nitrogen and phosphorus Carbon dioxide

pARAMAGNETIC MEISSNER EFFECTS IN MELT-TEXTURED Y_(0.99)Nd_(0.01)Ba_2Cu_3O_(7-y)SUpERCONDUCTOR

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2002年第3期15卷 295-298页

作者： Y.T. xing Y.z. Wang G.W. Qiao Institute of Metal Research The Chinese Academy of Sciences Shenyang 110016 China

The paramagnetic Meissner effect (pME) was observed on the field-cooled M-T curves of melt-textured Y0.99Nd0.01Ba2Cu3O7-y in applied magnetic fields from 1kOe to 40kOe. In the magnetic field below 1kOe, the sample undergoes the typical transition from the normal state to the superconducting state when it was cooled down. The applied magnetic fields in which the pME occurs, are very high compared with the fields reported in literatures. We propose that the occurrence of the pME may be due to a phase transition of flux vortices in the superconductors.

关键词： YBCO superconductor paramagnetic Meissner effect (pME)

Studying developmental neurotoxic effects of bisphenol A(BpA) using embryonic stem cells

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2015年第10期27卷 173-177页

作者： Jinhua Li Katherine z.Fu Sai Vemula X.Chris Le xing-Fang Li Division of Analytical and Environmental Toxicology Department of Laboratory Medicine and PathologyUniversity of Alberta

There is little to no toxicity information regarding thousands of chemicals to which people are exposed *** fact,of the84,000 chemicals listed in the United States Toxic Substances Control Act Inventory,there is limit... 详细信息

关键词： Bisphenol A(BpA) Embryonic stem cells(ESCs) Embryoid bodies(EBs) Environmental toxicology Developmental toxicity Neural ectoderm Neural progenitor cells(NpCs) Neurotoxicity

HDpairFinder:A data processing platform for hydrogen/deuterium isotopic labeling-based nontargeted analysis of trace-level amino-containing chemicals in environmental water

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第2期136卷 583-593页

作者： Tingting zhao Kristin Carroll Caley B.Craven Nicholas J.p.Wawryk Shipei xing Jian Guo xing-Fang Li Tao Huan Department of Chemistry Faculty of ScienceUniversity of British ColumbiaVancouver Campus2036 Main MallVancouverBritish ColumbiaV6T 1Z1Canada Division of Analytical and Environmental Toxicology Department of Laboratory Medicine and PathologyFaculty of Medicine and DentistryUniversity of AlbertaEdmontonAlberta T6G 2G3Canada

The combination of hydrogen/deuterium(H/D)formaldehyde-based isotopic methyl labeling with solid-phase extraction and high-performance liquid chromatography–high resolution mass spectrometry(HpLC-HRMS)is a powerful analytical solution for nontargeted analysis of trace-level amino-containing chemicals in water *** the huge amount of chemical information generated in HpLC-HRMS analysis,identifying all possible H/Dlabeled amino chemicals presents a significant challenge in data *** address this,we designed a streamlined data processing pipeline that can automatically extract H/D-labeled amino chemicals from the raw HpLC-HRMS data with high accuracy and ***,we developed a cross-correlation algorithm to correct the retention time shift resulting from deuterium isotopic effects,which enables reliable pairing of H-and D-labeled ***,we implemented several bioinformatic solutions to remove false chemical features generated by in-source fragmentation,salt adduction,and natural13C ***,we used a data mining strategy to construct the AMINES library that consists of over 38,000 structure-disjointed primary and secondary amines to facilitate putative compound ***,we integrated these modules into a freely available R program,*** rationale of each module was justified and its performance tested using experimental H/D-labeled chemical standards and authentic water *** further demonstrated the application of HDpairFinder to effectively extract N-containing contaminants,thus enabling the monitoring of changes of primary and secondary N-compounds in authentic water *** is a reliable bioinformatic tool for rapid processing of H/D isotopic methyl labeling-based nontargeted analysis of water samples,and will facilitate a better understanding of N-containing chemical compounds in water.

关键词： Isotope labeling Nontargeted analysis Reactive N-compounds HpLC-HRMS Source water

Geometry dependent photoconductivity of In2S3 kinks synthesized by kinetically controlled thermal deposition

在线全文

学校读者我要写书评

暂无评论

Nano Research 2016年第12期9卷 3848-3857页

作者： xing Xiong Qizhang Lin Gan xing zhou Xiaonan xing Huiqiao Li Tianyou zhai State Key Laboratory of Material processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology (HUST) Wuhan 430074 China

High quality In2S3 kinks were synthesized via a kinetically controlled thermal deposition process and their optoelectronic characteristics were systematically explored. The growth mechanism was attributed to the combination of kinetic dynamic, crystal fadal energy, and surface roughness. Two trap induced emission bands were evidenced via a low temperature cathodoluminescence （CL） study. Furthermore, the nanowire junctions demonstrated a degenerative photodetection performance, as compared to the straight arms, attributed to a stress-induced extra series resistance measured from the kinked area. The well-controllable shape of the inorganic nanostructures and the detailed exploration of their optoelectronic properties are particularly valuable for their further practical applications.

关键词： geometry dependence photodetection In2S3 kinks thermal deposition

First and Second Order Asymptotics of the Spectral Risk Measure for portfolio Loss Under Multivariate Regular Variation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2020年第5期33卷 1533-1544页

作者： xing Guodong YANG Shanchao School of Mathematics and Statistics Hefei Normal UniversityHefei 230601China School of Mathematicsand Statistics Yulin Normal UniversityYulin 537000China School of Mathematics and Statistics Guangri Normnl UniversityGuilin 541004China

In the context of multivariate regular variation,the authors establish the first-order asymptotics of the spectral risk measure of portfolio ***,by the notion of second-order regular variation,the second-order asymptotics of the spectral risk measure of portfolio loss is also *** order to illustrate the derived results,a numerical example with Monte Carlo simulation is carried out.

关键词： Asymptotics multivariate regular variation regular variation second-order regular variation spectral risk measure value-at-risk

Dynamic statistical information theory

在线全文

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & Astronomy) 2006年第1期49卷 1-37页

作者： xing Xiusan Department of physics Beijing Institute of Technology Beijing 100081 China

In recent years we extended Shannon static statistical information theory to dynamic processes and established a Shannon dynamic statistical information theory, whose core is the evolution law of dynamic entropy and dynamic information. We also proposed a corresponding Boltzmman dynamic statistical information theory. Based on the fact that the state variable evolution equation of respective dynamic systems, i.e. Fok- ker-planck equation and Liouville diffusion equation can be regarded as their information symbol evolution equation, we derived the nonlinear evolution equations of Shannon dy- namic entropy density and dynamic information density and the nonlinear evolution equa- tions of Boltzmann dynamic entropy density and dynamic information density, that de- scribe respectively the evolution law of dynamic entropy and dynamic information. The evolution equations of these two kinds of dynamic entropies and dynamic informations show in unison that the time rate of change of dynamic entropy densities is caused by their drift, diffusion and production in state variable space inside the systems and coordinate space in the transmission processes; and that the time rate of change of dynamic infor- mation densities originates from their drift, diffusion and dissipation in state variable space inside the systems and coordinate space in the transmission processes. Entropy and in- formation have been combined with the state and its law of motion of the systems. Fur- thermore we presented the formulas of two kinds of entropy production rates and infor- mation dissipation rates, the expressions of two kinds of drift information flows and diffu- sion information flows. We proved that two kinds of information dissipation rates (or the decrease rates of the total information) were equal to their corresponding entropy produc- tion rates (or the increase rates of the total entropy) in the same dynamic system. We obtained the formulas of two kinds of dynamic mutual informations and

关键词： evolution equation of Shannon information (entropy) evolution equation of Boltzmann informa-tion (entropy) information (entropy) flow information (entropy) diffusion entropy production rate informa- tion dissipation rate dynamic mutual infomation dynamic chamnel capacity.

Local Exact Boundary Synchronization for a Kind of First Order Quasilinear Hyperbolic Systems

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2019年第1期40卷 79-96页

作者： xing LU School of Mathematics Southeast University School of Mathematical Sciences Fudan University

In this paper, the synchronization for a kind of first order quasilinear hyperbolic system is taken into account. In this system, all the equations share the same positive wave speed. To realize the synchronization, a uniform constructive method is adopted, rather than an iteration process usually used in dealing with nonlinear systems. Furthermore,similar results on the exact boundary synchronization by groups can be obtained for a kind of first order quasilinear hyperbolic system of equations with different positive wave speeds by groups.

关键词： Exact boundary synchronization Quasilinear hyperbolic system Exact boundary synchronization by groups