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Residual dynamics of thiacloprid in medical herbs marjoram,thyme,and camomile in soil

Journal of Environmental Sciences 2007年第2期19卷 205-209页

作者： YU Yun-long WU jia-lun STAHLER Matthias PESTEMER Wilfried Department of Plant Protection College of Agriculture and Biotechnology Zhejiang University Hangzhou 310029 China Institute for Ecotoxicology and Ecochemistry in Plant Protection Federal Biological Research Centre for Agriculture and Forestry Koenigin-Luise-Strafle 19 D-14195 Berlin Germany

Thiacloprid is a new insecticide of the chloronicotinyl family. To assess its risk after application, residual characteristics of thiacloprid in marjoram, thyme, and camomile and in soil were studied under field conditions. The active ingredient was extracted from the plant material using a mixture of acetone-water. After filtration, the extract was concentrated to the aqueous phase, diluted with water, and portioned against ethyl acetate on a matrix solid phase dispersion column. Thiacloprid was extracted from soil using a mixture of methanol-water, filtered, and *** （clean up） with dichloromethane. The residues were quantified using HPLC-MS-MS. The methods were validated by recovery experiments. Thiacloprid residues in marjoram, thyme, and camomile and in soil persisted beyond 10, 14, 14, and 21 d but no residues were detected after 14, 21, 21, and 28 d, respectively. The data obtained in this study indicated that the biexponential model is more suitable than the first-order function to describe the decline of thiacloprid in fresh marjoram, fresh thyme, and dried camomile flowers with half-life （t1/2） of 1.1, 0.7, and 1.2 d, respectively. However, both the first-order function and biexponential model were found to be applicable for dissipation of thiacloprid in soil with almost the same t1/2 values of 3.5 and 3.6 d. The results indicated that thiacloprid dissipates rapidly and does not accumulate in the tested herbs and in soil.

关键词： thiacloprid marjoram (Majorana hortensis) thyme (Thymus vilgaris) camomile (Matricaria chamomilla) residue

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Insulin resistance and the metabolism of branched-chain amino acids

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Frontiers of Medicine 2013年第1期7卷 53-59页

作者： Jingyi Lu Guoxiang xie Weiping jia Wei jia Shanghai Diabetes Institute Department of Endocrinology and MetabolismShanghai Jiao Tong University Affiliated Sixth People’s HospitalShanghai Key Laboratory of Diabetes MellitusShanghai Clinical Center for DiabetesShanghai 200233China Center for Translational Medicine Shanghai Jiao Tong University Affiliated Sixth People’s HospitalShanghai 200233China Center for Translational Biomedical Research University of North Carolina at GreensboroNorth Carolina Research CampusKannapolisNC 28081USA

Insulin resistance(IR)is a key pathological feature of metabolic syndrome and subsequently causes serious health problems with an increased risk of several common metabolic *** related metabolic disturbance is not restricted to carbohydrates but impacts global metabolic ***-chain amino acids(BCAAs),namely valine,leucine and isoleucine,are among the nine essential amino acids,accounting for 35%of the essential amino acids in muscle proteins and 40%of the preformed amino acids required by *** BCAAs are particularly responsive to the inhibitory insulin action on amino acid release by skeletal muscle and their metabolism is profoundly altered in insulin resistant conditions and/or insulin *** increased circulating BCAA concentration in insulin resistant conditions has been noted for many years and BCAAs have been reported to be involved in the regulation of glucose homeostasis and body weight,it is only recently that BCAAs are found to be closely associated with *** review will focus on the recent findings on BCAAs from both epidemic and mechanistic studies.

关键词： branched-chain amino acids leucine isoleucine valine insulin resistance

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A novel multisignature scheme for a special verifier group against clerk and rogue-key attacks

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Journal of Zhejiang University-Science C(Computers and Electronics) 2010年第4期11卷 290-295页

作者： jia-lun TSAI Tzong-chen WU Kuo-yu TSAI Department of Information Management National Taiwan University of Science and Technology Taiwan Information Security Center National Taiwan University of Science and Technology

The digital signature is a very important subject for network *** multiple signers and multiple verifiers,xie and Yu(2004) pointed out that the multisignature scheme of Laih and Yen(1996) is vulnerable to a harmful *** attack can occur when a specified group of verifiers cooperate to forge a multisignature by secret key substitution following the leak of a secret key or by group public key adjustment during the process of renewing *** and Yu proposed an improvement of Laih and Yen's multisignature *** this paper,we show that xie and Yu's scheme is vulnerable to clerk and rogue-key *** propose an improved multisignature scheme to resist such *** the proposed scheme,multiple signers can generate a multisignature for the message with the signers' secret keys,and the specified group of verifiers can cooperate to verify the validity of the multisignature with the signers' public keys and the verifiers' secret *** proposed scheme for a special verifier group not only has the advantages of xie and Yu's scheme,but also is secure against clerk and rogue-key attacks.

关键词： Multisignature Clerk attack Rogue-key attack Cryptosystem

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A full multigrid method for nonlinear eigenvalue problems

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Science China Mathematics 2016年第10期59卷 2037-2048页

作者： jia ShangHui xie HeHu xie ManTing XU Fei School of Statistics and Mathematics Central University of Finance and Economics LSEC ICMSEC Academy of Mathematics and Systems Science Chinese Academy of Sciences

We introduce a type of full multigrid method for the nonlinear eigenvalue problem. The main idea is to transform the solution of the nonlinear eigenvalue problem into a series of solutions of the corresponding linear boundary value problems on the sequence of finite element spaces and nonlinear eigenvalue problems on the coarsest finite element space. The linearized boundary value problems are solved by some multigrid *** the multigrid iteration, all other efficient iteration methods for solving boundary value problems can serve as the linear problem solver. We prove that the computational work of this new scheme is truly optimal,the same as solving the linear corresponding boundary value problem. In this case, this type of iteration scheme certainly improves the overfull efficiency of solving nonlinear eigenvalue problems. Some numerical experiments are presented to validate the efficiency of the new method.

关键词： nonlinear eigenvalue problem full multigrid method multilevel correction finite element method

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Non-storm erosion of MeV electron outer radiation belt down to L^(*)<4.0 associated with successive enhancements of solar wind density

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Earth and Planetary Physics 2021年第6期5卷 581-591页

作者： Ying Xiong lun xie SuiYan Fu BinBin Ni ZuYin Pu School of Earth and Space Science Peking UniversityBeijing 100871China Department of Earth and Space Sciences Southern University of Science and TechnologyShenzhen 518055China Department of Space Physics School of Electronic InformationWuhan UniversityWuhan 430072China

We report an unusual non-storm erosion event of outer zone MeV electron distribution during three successive solar wind number density enhancements(SWDEs)on November 27-30,*** of MeV electrons and energy-dependent narrowing of electron pitch angle distributions(PAD)first developed at L^(*)=5.5 and then moved down to L^(*)4 during SWDE1 are mainly due to outward radial *** during SWDE2&3,scattering loss due to EMIC waves is dominant at 4

关键词： solar wind density enhancement outer radiation belt MeV electrons outward radial diffusion EMIC wave scattering loss

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Metabolomics in human type 2 diabetes research

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Frontiers of Medicine 2013年第1期7卷 4-13页

The high prevalence of diabetes and diabetic complications has caused a huge burden on the modern *** scientific advances have led to effective strategies for preventing and treating diabetes over the past several decades,little progress has been made toward curing the disease or even getting it under control,from a public health and overall societal *** is still a lack of reliable biomarkers indicative of metabolic alterations associated with diabetes and different drug responses,highlighting the need for the development of early diagnostic and prognostic markers for diabetes and diabetic *** emergence of metabolomics has allowed researchers to systemically measure the small molecule metabolites,which are sensitive to the changes of both environmental and genetic factors and therefore,could be regarded as the link between genotypes and *** the last decade,the progression made in metabolomics has provided insightful information on disease development and disease onset *** studies using metabolomics approach coupled with statistical tools to predict incident diabetes revealed a number of metabolites that are significantly altered,including branched-chain and aromatic amino acids,such as isoleucine,leucine,valine,tyrosine and phenylalanine,as diagnostic or highly-significant predictors of future *** review summarizes the current findings of metabolomic studies in human investigations with the most common form of diabetes,type 2 diabetes.

关键词： metabolomics type 2 diabetes metabolic pathway mass spectrometry nuclear magnetic resonance(NMR)

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Determining the geographic origin of the brown planthopper, Nilaparvata lugens, using trace element content

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Insect Science 2012年第1期19卷 21-29页

作者： Qi Peng Qi-Yi Tang jia-lun Wu Qing-Ling Miao jia-An Cheng State Key Laboratory of Rice Biology Institute of Insect SciencesZhejiang UniversityHangzhouChina

bstract A chemometric study using pattern recognition technology was carried out to characterize the geographic origins of the brown planthopper, Nilaparvata lugens. The concentrations of 23 trace elements （Mn, Mo, Cd, Ce, V, Th, Cs, Be, T1, Fe, Nd, Pr, Se, Tm, Lu, Eu, Ho, Br, Dy, Gd, U, Sm and Er） in 53 samples from seven regions in southern China were determined using inductively coupled plasma mass spectrometry. The data obtained were successively evaluated using a multivariate statistical approach, namely, linear discriminant analysis, which allowed classification and discrimination of the N. lugens samples from Fuqing, Shaoguan, Hepu, Yongfu, Hengnan, Wan-an and Yongkang with high accuracy and a clear separation among the seven regions. The results show that pattern identification on the basis of trace elements in the bodies ofN. lugens is feasible for determining the geographic origins of individuals.

关键词： brown planthopper discriminant analysis forecasting geographic origin trace element

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Recent Advances of Catalytic Enantioselective Heck Reactions and Reductive-Heck Reactions

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Chinese Journal of Chemistry 2021年第3期39卷 710-728页

作者： jia-Qi xie Ren-Xiao Liang Yi-Xia jia College of Chemical Engineering State Key Laboratory Breeding Base of Green-Chemical Synthesis TechnologyZhejiang University of TechnologyHangzhouZhejiang 310014China

Heck reaction is one of the most important carbon-carbon bond forming reactions with wide applications in organic *** advances of enantioselective Heck reaction have been achieved in the past *** review focuses on recent development of catalytic asymmetric Heck reaction and reductive Heck reaction,which covers intermolecular and intramolecular versions since *** article is organized in terms of the cat-alysts and olefin substrates.

关键词： Heck reaction Asymmetric catalysis Palladium Nickel Reductive Heck reaction

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Interactions Between Surface Reactions and Gas-phase Reactions in Catalytic Combustion and Their Influence on Ignition of HCCI Engine

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Chemical Research in Chinese Universities 2006年第6期22卷 776-782页

作者： ZENG Wen xie Mao-zhao jia Ming Department of Power Engineering Dalian University of Technology Dalian 116024 P. R. China

The catalytic combustion of methane in a mierochannel whose surface was coated with platinum（Pt） catalyst was studied by numerical-simulation. The effects of gas-phase reactions on the whole catalytic combustion process were analyzed at a high inlet pressure. A sensitivity analysis of the detailed mechanisms of the surface reaction of methane on Pt revealed that the most sensitive reactions affecting the heterogeneous ignition are oxygen adsorption/desorption and methane adsorption, and the most sensitive reactions affecting the homogeneous ignition are OH and H2O adsorption/desorption. The combustion process of the homogeneous charge compression ignition（HCCI） engine whose piston face was coated with Pt catalyst was simulated. The effects of catalysis and the most sensitive reactions on the ignition timing and the concentration of the main intermediate species during the HCCI engine combustion are discussed. The results show that the ignition timing of the HCCI engine can be increased by catalysis, and the most sensitive reactions affecting the ignition timing of the HCCI engine are OH and H2O adsorption/desorption.

关键词： Heterogeneous ignition Homogeneous ignition Methane Homogeneous charge compression ignition (HCCI) Numerical simulation

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Therapeutic effect of osthole on hyperlipidemic fatty liver in rats

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Acta Pharmacologica Sinica 2007年第3期28卷 398-403页

作者： Yan ZHANG Mei-lin xie~2 Lu-jia ZHU Zhen-lun GU Department of Pharmacology,Medical School of Soochow University Suzhou 215123,China Department of Pharmacology Medical School of Soochow University Suzhou China

Aim:To study the effects of osthole on hyperlipidemic fatty liver and investigatethe possible ***:A rat model with hyperlipidemic fatty liverwas successfully established by feeding fatty milk for 6 *** experimentalrats were then treated with 5-20 mg/kg osthole for 6 *** mouse hyperlipi-demic model was induced by feeding fatty milk when they were treated with 10-20mg/kg osthole for 3 ***:After treatment with osthole,the levels of ratserum total cholesterol(TC),triglyceride(TG)and low density lipoprotein-choles-terol significantly decreased as compared with the fatty liver model group(P<0.05or P<0.01).Hepatic weight and its coefficient,the hepatic tissue contents of TC,TG,and malondialdehyde,also significantly decreased(P<0.05 or P<0.01).Infatty milk-induced hyperlipidemic mice,the post-heparin plasma activities of lipo-protein lipase(LPL),hepatic lipase(HL),and total lipase(TL)significantlyincreased after treatment with 10-20 mg/kg osthole for 3 weeks(P<0.05 or P<0.01).Importantly,the histological evaluation of rat liver demonstrated that ostholedramatically decreased lipid accumulation(P<0.01).Conclusion:Osthole wasfound to have therapeutic effects on fatty milk-induced rat fatty liver;the mecha-nisms might be associated with its anti-oxidation and the elevation of the activi-ties of LPL and HL.

关键词： osthole hyperlipidemic fatty liver pharmacology

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