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Imazaquin degradation and metabolism in a sandy loam soil amended with farm litters

Journal of Environmental Sciences 2007年第9期19卷 1108-1113页

作者： WANG Hui-li li yan-yan WEI Guo-hui WANG Xue-dong Key Laboratory of Pesticide and Chemical Biology of Ministry of Education Central China Normal University Wuhan 430079 China

Irnazaquin applied in legume crops has a long residual time in soil, which often impacts safety of the susceptible crops. To increase safety of imazaquin application, two composted litters, bovine manure （BM） and chicken manure （CM）, were used to determine their effects on imazaquin environmental behavior by incorporating each kind of manure into the tested sandy loam soil at 10% （w/w）. The degradation of imazaquin in BM- and CM-amended soil was about 2.4 and 1.5 times, respectively, faster than that in unamended soil. The half-lives of imazaquin in BM-amended soil varied between 6.7 and 15.4 d over the temperature range of 20 to 40℃, and the degradation rate constant （k） increased by a factor of about 1.5 for every 10℃ change. Higher mix ratio did not significantly increase the degradation, and the optimal active degradation of imazaquin was observed approximately at the mix ratio of 10：1 of soil to BM. The different moisture levels had negligible effect on imazaquin degradation. In both unamended and BM-amended treatments, two metabolites were observed at 5, 10 and 30 d after treatment. One metabolite at retention time （RT） of 8.4 rain was identified as 2-（4- hydroxyl-5-oxo-2-imidazolin-2-yl） quinoline acid, originating from the loss of isopropyl group and hydroxylation at the 4-position of imidazolinone ring. The other at RT of 12.9 rain was identified as quinoline-2,3-dicarboxylic anhydride, resulting from detachment of imidazolinone ring and the forming of dicarboxylic anhydride. This finding suggested that the addition of farm litters into soil might be a good management option since it can not only increase soil fertility but also contribute to increase safety of imazaquin application to the following susceptible crops.

关键词： imazaquin farm litter enhanced degradation metabolite

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Higher-Dimensional Integrable Systems Arising from Motions of Curves on S^2(R)and S^3(R)

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Communications in Theoretical Physics 2008年第10期50卷 841-843页

作者： QU Chang-Zheng li yan-yan Center for Nonlinear Studies Northwest University Xi＇an 710069 China Department of Mathematics Northwest University Xi＇an 710069 China

We show that higher-dimensional integrable systems including the (2+1)-dimensional generalized sine-Gordon equation and the (2+1)-dimensional complex mKdV equation are associated with motions of surfaces inducedby end... 详细信息

关键词： higher-dimensional integrable system motion of curve sine-Gordon equation complex mKdV equation

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Integrable Curve Motions in n-Dimensional Centro-Affine Geometries

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Chinese Physics Letters 2010年第3期27卷 5-8页

作者：李艳艳 Institute of Mathematics and Information Science Xianyang Normal University Xianyang 712000

Motions of curves in n-dimensional （n ≥ 4） centro-affine geometries are studied. It is shown that the 1＋1-dimensional KdV equations and their hierarchy satisfied by the curvatures of curves under inextensible moti... 详细信息

关键词： Mathematical physics Statistical physics and nonlinear systems

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QCM and EC-SPR Studies of Cytochrome c Self-assembled on Au Electrode and Enhancement of SPR Signal by Au Nanoparticles

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Chemical Research in Chinese Universities 2012年第6期28卷 1061-1065页

作者： WANG yan-yan JIANG yan-xla ZHOU You-chen li yan-yan MA Zhi-fang SUN Shi-gang State Key Laboratory of Physical Chemistry of Solid Surfaces Department of ChemistryCollege of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 P. R. China

Quartz crystal microbalance（QCM） and cyclic voltammetry（CV） were used to characterize the monolayer of cytochrome c（Cyt c）,which was adsorbed on gold film modified with alkanethiol mixed monolayer.A direct comparison of protein surface coverages calculated from QCM and cyclic voltammetric measurements illustrates that the ratio of the electroactive Cyt c to the total surface-confined Cyt c is 34%,which suggests that the orientation is a main factor affecting the electroactivity of Cyt ***,surface plasmon resonance（SPR） measurement combined with CV ＂in situ＂ was used to investigate the conformational change of Cyt c in the redox ***,Au nanoparticles（Au NPs） were adsorbed on the surface of Cyt *** result indicates that Au NPs promote electron transfer between Cyt c and the gold electrode,and SPR result suggests Au NPs enhance SPR signal.

关键词： Cytochrome c Gold film Self-assembly Electrochemical-surface plasmon resonance(EC-SPR)

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Sensitive and Rapid Quantification of Felodipine by High-performance liquid Chromatography-tandem Mass Spectrometry(HPLC-MS/MS) and Its Pharmacokinetics in Healthy Chinese Volunteers

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Chemical Research in Chinese Universities 2006年第4期22卷 479-483页

作者： li yan-yan YIN Yi-zi SUN Zhi-hui li Xin HU li-gang li Peng-fei ZHONG Da-fang The First Hospital Jilin University Changchun 130021 P.R. China Research Center for Drug Metabolism Jilin University Changchun 130021 P. R. China

To investigate the pharmacokinetics of felodipine in the plasma of healthy Chinese volunteers, 30 healthy volunteers received a single oral dose of 5 mg of extended release felodipine tablets. The felodipine was extracted from the matrix with a liquid-liquid extract procedure and analyzed by high-performance liquid chromatography-tandem mass spectrometry in the multiple reaction monitoring（MRM） mode using an electrospray ion source with positive ion detection. The method was validated over a felodipine concentration range of 0. 05-10.00 ng/mL in human plasma. Its main pharmacokinetic parameters values were： ρmax = （ 1.67 ± 0. 84 ） ng/mL, occurring at （ 3.93 3± 2. 49 ） h; the plasma elimination half-life：（23. 08 3± 9. 48） h and the area under the plasma concentration versus time curve：（29. 94 ± 14. 39） ng · h/mL. The validation results demonstrated that this method showed a satisfactory precision and accuracy across the calibration range. The procedure involved minimal drug administration, sample preparation, and a 2. 5-min chromatographic run time. It was well suited to clinical studies of the drug involving large numbers of samples.

关键词： Felodipine liquid chromatography-tandem massspectrometry Pharmacokinetics

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Electrical, Structural and Interfacial Characterization of HfO2 Films on Si Substrates

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Chinese Physics Letters 2011年第8期28卷 240-242页

作者： TAN Ting-Ting liU Zheng-Tang li yan-yan State Key Laboratory of Solidification Processing College of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an 710072

Hafnium oxide films are deposited on Si(100)substrates by means of rf magnetron *** interfacial structure is studied using high-resolution transmission electron microscopy(HRTEM)and x-ray photoelectron spectroscopy(XPS),and the electrical properties of the Au/HfO_(2)/Si stack are analyzed by frequency−dependent capacitance-voltage(C–V–f)*** amorphous interfacial layer between HfO_(2) and the Si substrate is observed by the HRTEM *** the results of XPS,the interfacial layer comprises hafnium silicate and silicon *** C–V–f measurements,the C–V plots show a peak at a low frequency and the change in frequency has effects on the intensity of the *** expected,rapid thermal annealing can passivate the interface states of the HfO_(2)/Si stack.

关键词： C–V interfacial HfO2

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STUDY ON TURBULENCE FEATURES NEAR AN OSCILLATING CURVED WALL

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Journal of Hydrodynamics 2007年第3期19卷 255-263页

作者： WANG Wen-quan ZHANG li-xiang yan yan GUO Yakun Department of Engineering Mechanics Kunming University of Science and Technology Kunming 650051China Department of Engineering University of Aberdeen Aberdeen AB24 3UE UK

In pursuit of possibly true turbulent characters and for exploring a change in turbulence structures near an oscillating flexible wall-curved surface, a sinusoidal oscillation mode was forced to a curved wall, whose vibrations disturbed the flow with an interacting effort between the fluid and the structure. The methodology used was the Large Eddy Simulation （LES） with fluid-structure interaction. The oscillating configuration was on a Fourier sinusoidal mode from the measurements of a Francis hydro turbine blade vibration. The effects of the vibration on the skin friction coefficient, vortices, turbulent coherent structures, and other statistical quantities were studied. The results showed that the streamwise velocity gradient along the normal direction and the normal velocity gradient along the spanwise direction were considerably increased within the viscous sublayer because of the oscillating wall, which additionally caused the low speed streaks to stay away from the wall and the high-momentum flows to be toward the wall. As a result, the streamwise vortices were much more elongated along the downstream to get an energy balance, and the wall skin friction coefficient or the wall friction velocity rose up.

关键词： turbulent flow turbulent structure Large-Eddy Simulation (LES) fluid-structure interaction

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LH Plays a Role to Enhance the Nuclear and Cytoplasm Synchronization During In vitro Maturation of Ovine Oocytes

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Agricultural Sciences in China 2011年第1期10卷 136-141页

作者： li Kai NI He-min liU Yun-hai ZHAO yan-wei QU yang-yan li Xiao-yan GUO Yong Department of Animal Science ＆ Technology Beijing University o[ Agriculture Beijing 102206 P.R.China

This study is aimed to investigate the effect of luteinizing hormone （LH） on maturation and fertilization in vitro of ovine oocytes. The ovine oocytes were cultured in vitro in medium with or without LH, and then checked by confocal laser scanning microscope to observe the distribution of cortical granules stained with FITC-LCA during different maturation periods. Similarly, some in vitro matured oocytes were also fertilized in vitro for analysis of their developmental potentiality further. After being cultured in vitro for 4 h, there were significant differences about the rate of germinal vesicle break down （GVBD） between the treatment （with LH） and the control groups （without any hormones）（36.76% vs 18%, P〈0.05）. Further, there were also significant differences of the cleavage and blastocyst rates between these two groups （67.15% vs 42.37%, 21.9% vs 12.71%, P〈0.05, respectively）. The distribution of cortical granules appeared to spread from the edges to the central site of sheep oocytes following their delaying durations of maturation in vitro. It can be concluded that LH may play a role to delay the occurence of GVBD, prolong the maturation duration of cytoplasm, and enhance the nuclear and cytoplasm synchronization of ovine oocytes matured in vitro and finally improve their in vitro developmental potentiality.

关键词： ovine oocyte luteinizing hormone in vitro maturation in vitro fertilization distribution of cortical granules

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Overexpression of Brassica napus cytosolic fructose-1,6-bisphosphatase and sedoheptulose-1,7-bisphosphatase genes significantly enhanced tobacco growth and biomass

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Journal of Integrative Agriculture 2022年第1期21卷 49-59页

作者： li yan-yan GUO li-na liANG Cheng-zhen MENG Zhi-gang Syed TAHIRA GUO San-dui ZHANG Rui Biotechnology Research Institute Chinese Academy of Agricultural Sciences/National Key Facility for Crop Gene Resources and Genetic ImprovementBeijing 100081P.R.China

Elevated activities of cytosolic fructose-1,6-bisphosphatase(cyFBPase) and sedoheptulose-1,7-bisphosphatase(SBPase)are associated with higher yields in plants. In this study, the expression levels of the cyFBPase and SBPase genes were increased by overexpressing rape(Brassica napus) cDNA in tobacco(Nicotiana tabacum) plants. The transgenic plants coexpressing cy FBPase and SBPase(TpFS), or expressing single cy FBPase(TpF) or SBPase(TpS) had 1.77-, 1.55-, 1.23-fold cyFBPase and 1.45-, 1.12-, 1.36-fold SBPase activities as compared to the wild-type(WT), respectively. Photosynthesis rates of TpF, TpS and TpFS increased 4, 20 and 25% compared with WT plants. The SBPase and cyFBPase positively regulated each other and functioned synergistically in transgenic tobacco plants. In addition, the sucrose contents of the three transgenic plants were higher than that of WT plants. The starch accumulation of the TpFS and TpS plants was improved by 53 and 37%, but slightly decreased in TpF plants. Moreover, the transgenic tobacco plants harbouring SBPase and/or cyFBPase genes showed improvements in their growth, biomass, dry weight, plant height, stem diameter, leaf size,flower number, and pod weight. In conclusion, co-expression of SBPase and cyFBPase may pave a new way for improving crop yield in agricultural applications.

关键词： tobacco cytosolic fructose-1,6-bisphosphatase(cy FBPase) sedoheptulose-1,7-bisphosphatase(SBPase) overexpression transformation

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Estimating the Effects of the COVID-19 Outbreak on the Decreasing Number of Acquired Immune Deficiency Syndrome Cases and Epidemiological Trends in China

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Biomedical and Environmental Sciences 2022年第2期35卷 141-145页

作者： li yan yan DING Wen Hao BAI Yi Chun WANG Lei WANG Yong Bin Department of Epidemiology and Health Statistics School of Public HealthXinxiang Medical UniversityXinxiangHenanChina Center for Musculoskeletal Surgery Charité-Universitätsmedizin BerlinCorporate Member of Freie Universität BerlinHumboldt-Universität Zu Berlin and Berlin Institute of HealthBerlinGermany

Since the first case of acquired immune deficiency syndrome(AIDS)was detected in the United States in 1981,this disease has spread to every corner of the *** the annual incidence of AIDS showing a slight decline since 1997,it remains a major cause of infectious disease-related death *** global epidemiological trends,the number of notified AIDS cases has increased in recent years in China[1].Moreover,among the class B notifiable infectious diseases,AIDS was responsible for the highest mortality rate from 2008 to 2019,still failing to be identified as a vaccine-preventable disease[1].Thus,to provide more unambiguous and quantitative direction for the effective formulation of preventive planning strategies and for the reasonable allocation of limited resources,a forecasting model with high precision and accuracy to understand the future epidemic behaviors of AIDS is *** the model-building process,accurate statistics are vital to ensure the forecasting accuracy of the model.

关键词： forecasting spite formulation

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