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Development of ELISA and immunochromatographic assay for ofloxacin

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Chinese Chemical Letters 2007年第9期18卷 1107-1110页

作者： Wu Yong Sun wen Ying Liu Ling Bo qu Department of Pharmacy China Pharmaceutical UniversityNanjing 210009China Department of Chemistry Zhengzhou UniversityZhengzhou 450052China

Two rapid, sensitive and reliable immunoassay methods, namely competitive indirect enzyme-linked immunosorbent assay (CI-ELISA) and colloidal gold-based immunochromatographic assay (CGIA), were developed to detect ofloxacin (OFL). The linear range of the CI-ELISA was from 0.5 to 128 ng/mL with a limit of detection (LOD) of 0.35 ng/mL. Good recoveries were obtained in analyzing simulated swine urine samples. The CGIA could accurately estimate OFL at concentrations as low as 10 ng/mL in less than 10 min, and test results were read visually without any instrument.

关键词： Ofloxacin (OFL) Polyclonal antibody (pAb) Competitive indirect enzyme-linked immunosorbent assay (CI-ELISA) Colloidal gold-based immunochromatographic assay (CGIA)

Solvothermal Syntheses of (H_2en)_2Sn_2S_6·en and[(H_2hmda)_3(Hhmda)_2](Sn_2S_6)_2Using SnCl_4 and S_8 as Starting Materials

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Chinese Journal of Structural Chemistry 2005年第10期24卷 1157-1163页

作者： JIA Ding-Xian DAI Jie ZHU Qin-Yu LU wen GUO wen-juan Department of Chemistry and Chemical Engineering Suzhou University Suzhou 215006 China State Key Laboratory of Coordination Chemistry Nanjing University Nanjing 210093 China

Three thiostannates （H2en）2Sn2S6· en 1, （Hen）4Sn2S6 2 （en = ethylenediamine, a known compound）and [（H2hmda）3（Hhmda）2]（Sn2S6）2 3 （hmda = hexamethylenediamine） were prepared using SnCl4.5H2O and S8 as starting materials in alkylenediamine solutions under mild solvothermal conditions. Compound 1 crystallizes in the triclinic system, space group P1^- with a = 8.7491（17）, b = 10.704（2）, c = 12.2031（19） A, a = 74.888（13）, β= 72.998（12）, γ= 89.032（15）°, V = 1052.9（3） A^3, Mr = 614.08, Z= 2, De = 1.937 g/cm^3, p = 2.966 mm^-1, F（000） = 604, S = 1.211, R = 0.0579 and wR = 0.0770 for 3999 observed reβections with I 〉 2σ（I）; while 3 crystallizes in the triclinic system, space group P1^- with a = 9.8075（13）, b = 10.8266（16）, c = 14.303（2） A, a = 88.611 （10）, β = 81.030（9）, γ = 74.609（9）°, V = 1446.1 （4） A^3, Mr = 1448.78, Z = 1, Dc = 1.664 g/cm^3, μ = 2.173 mm^-1, F（000） = 730, S = 1.173, R = 0.0457 and wR = 0.0667 for 5738 observed reβections with I 〉 2σ（I）. The compounds are composed of dimeric [Sn2S6]^4- anions and protohated alkylenediamine cations.

关键词： solvothermal synthesis thiostannate crystal structure hydrogen bond diamine

Heat Treatment of Cold-Rolled Low-Carbon Si-Mn Dual Phase Steels

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Journal of Iron and Steel Research International 2010年第1期17卷 54-58页

作者： LUO juan-juan SHI wen HUANG qun-fei LI Lin Material Science and Engineering College Shanghai University Shanghai 200072 China

The effects of overageing （OA） and vanadium addition on microstructure and properties of cold-rolled lowcarbon Si-Mn dual phase （DP） steel sheets are studied. The results show that the microstructure and mechanical properties of DP steels are greatly affected by OA temperature. When OA is done at low temperatures （473 -- 573 K）, the elongation rate increases sharply while both the yield strength and tensile strength decrease significantly, When OA is done at high temperatures （〉573 K）, the elongation does not further increase, but the yield strength increases and tensile strength decreases, which deteriorates the mechanical properties of the steel. The results also show that both the strength and the tempering stability can be significantly improved by vanadium microalloying. Finally, the optimum OA temperature for the traditional steel appears to be around 523 K, while it is around 573 K for the V-containing steel, resulting in the best overall mechanical properties.

关键词： dual phase steel overageing microstructure mechanical property vanadium

Wind-induced internal pressure response for structure with single windward opening and background leakage

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第3期9卷 313-321页

作者： Shi-ce YU wen-juan LOU Bing-nan SUN College of Civil Engineering and Architecture Zhejiang University Hangzhou 310027 China Department of Architecture Engineering Ningbo College of Technology Zhejiang University Ningbo 315100 China

Theoretical analysis and wind tunnel tests were carried out to study wind-induced intemal pressure response for the structure with single windward opening and background leakage. Its goveming differential equation was derived by the Bemoulli equation in an unsteady-isentropic form. Numerical examples were provided to study the additive damping caused by background leakage in laminar and turbulent flow, and the influence of background leakage on fluctuating internal pressure response was quantized. A series of models for low-rise building with various opening ratios and background leakage were designed and wind tunnel tests were conducted. It is shown that the fluctuating intemal pressure reduces when the background leakage are considered and that the effect of background leakage can be predicted accurately by the governing differential equation deduced in this paper.

关键词： Single windward opening Internal pressure Background leakage Governing equation Time-history analysis

Geophysical characteristics of anthracites with various structures: a case study on the southern Qinshui Basin, north China

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Frontiers of Earth Science 2022年第3期16卷 696-710页

作者： juan TENG Zhigang wen Chen LI Lingye MENG Hubei Key Laboratory of Petroleum Geochemistry and Environment Yangtze UniversityWuhan 430100China College of Resources and Environment Yangtze UniversityWuhan 430100China Research Institute Company Limited CNOOCBeijing 100028China Institute of Petroleum Exploration and Development of PetroChina Tarim Oilfield Korla 841000China

Deformation of coals under tectonic movements could cause reduction of mechanical strength and enhancement of gas adsorption,which might result in coal and gas outburst,and cause safety and environmental *** this study,geophysical characteristics of coals with various structures were investigated with a special emphasis on characterization of pore size distribution,rock mechanical strength,acoustic emission,resistivity and acoustic velocity of anthracites with three types of structures in the Qinshui Basin,north *** studied No.3 coal seam developed three types of structures,namely undeformed coal,cataclastic coal,and granular *** observations under scanning electron microscope and pore size distribution using N2 and CO_(2) adsorption of anthracites of three types show that the undeformed coal consists of primary micropores,and cataclastic coal is mainly composed of mesopores and well-connected *** comparison,granular coal has the least *** mechanical strength,acoustic emission,resistivity and acoustic velocity of coals with three structure types were investigated under uniaxial and triaxial *** increasing degree of deformation of anthracites,compression strength,Young’s modulus,density,acoustic emission counting and acoustic velocity decreases,while resistivity *** suggest that the evolution of pore size distribution of anthracites with increasing degree of deformation contributed to variations of geophysical characteristics of coals with different structures to some extent.

关键词： geophysical characteristics coal structures pore size distribution acoustic emission electrical resistivity acoustic velocity

Investigation on attitude disturbance control and vibration suppression for fuel-fille flexibl spacecraft

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Acta Mechanica Sinica 2015年第4期31卷 581-588页

作者： Xiao-juan Song Bao-Zeng Yue wen-Jun Wu School of Aerospace Engineering Beijing Institute of Technology School of Automobile and Traffi Engineering Guangxi University of Science and Technology

This paper is mainly focused on the attitude dynamics and control of a fuel-filled flexible spacecraft sub- jected to the thermal payload during eclipse transitions. The flexible appendages are considered as Euler-Bernoulli beams, and the sloshing liquid is modeled as in two modes multi-spring-mass models; the governing equations of this coupled system are developed by using Hamilton＇s prin- ciple. Numerical results show that the spacecraft attitude responses consist of a quasi-static displacement and superim- posed vibration. Then, we design an adaptive sliding mode and use the Lyapunov approach control law to control the attitude disturbance and suppress the thermal jitter and liq- uid sloshing for the fuel filled flexible spacecraft subject to the thermal payload. Numerical results are presented to verify the efficiency of the hybrid control methods. The results show that the adaptive sliding mode method might be effective to handle the steady-state errors and the Lyapunov control algo- rithm would suppress the residual vibration.

关键词： Fuel-filled flexible spacecraft Thermalpayload Adaptive sliding mode Lyapunov approachcontrol law

Trigger finger at the wrist caused by an intramuscular lipoma within the carpal tunnel:A case report

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World Journal of Clinical Cases 2021年第25期9卷 7564-7571页

作者： Chao Huang Hong-juan Jin De-Biao Song Zhe Zhu Heng Tian Ze-Hui Li wen-Rui qu Rui Li Department of Hand Surgery The Second Hospital of Jilin UniversityChangchun 130041Jilin ProvinceChina Department of Orthopaedics West China Hospital of Sichuan UniversityChengdu 610041Sichuan ProvinceChina Department of Plastic and Reconstructive Surgery The First Hospital of Jilin UniversityChangchun 130021Jilin ProvinceChina Department of Emergency and Critical Care Medicine The Second Hospital of Jilin UniversityChangchun 130012Jilin ProvinceChina

BACKGROUND Trigger finger at the wrist,which occurs with finger movement,is an uncommon *** reports describing cases of trigger finger at the wrist have been ***,we present a case of an intramuscular lipoma arising from an anomalous flexor digitorum muscle belly in a 48-year-old female patient causing painful finger triggering at the wrist and carpal tunnel syndrome(CTS).CASE SUMMARY A 48-year-old woman with complaints of a catching sensation during wrist motion and a progressive tingling sensation on the palmar aspect of the right hand for approximately 2 years was referred to our *** of the index to middle finger was evident with a palpable and audible clunk over the carpal tunnel during passive ***’s sign was positive over the carpal tunnel of the right wrist with a positive Phalen’s *** conduction studies of the median nerve demonstrated a right *** examination revealed a 2.5 cm×2.0 cm subcutaneous hyperechoic mass with no obvious blood flow at the wrist of the right *** excision of the tumor and muscle mass led to a resolution of the patient’s symptoms,and any triggering or discomfort *** patient has had no evidence of recurrence at more than 1 year of *** Triggering of the fingers at the wrist is rare. It must be noted that there are manypossible causes and types of triggering or clicking around the wrist. Accuratediagnosis is mandatory to avoid inaccurate treatment of patients with triggerwrist. During the diagnosis and treatment of CTS, attention should be paid to thevariation of tendon tissue in the carpal tunnel, to avoid only focusing on therelease of transverse carpal ligament and ignoring the removal of anomalousmuscle belly.

关键词： Intramuscular lipoma Trigger finger Muscle belly Flexor digitorum superficialis Treatment Case report

Effect of carbon addition on creep behavior of cast TiAl alloy with hard-oriented directional lamellar microstructure

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Journal of Iron and Steel Research International 2020年第11期27卷 1347-1356页

作者： Xi-wen Zhang Yu-ling Tang wen-juan Wan Chun-lei Zhu Ji Zhang Beijing Key Laboratory of Advanced High Temperature Materials China Iron and Steel Research Institute GroupBeijing 100081China National Center for Electron Microscopy in Beijing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Two TiAl alloys,Ti-47.5Al-3.7(Cr,V,Zr)and Ti-47.5Al-3.7(Cr,V,Zr)-0.1C(at.%),were prepared by cold crucible levitation melting to couple the hard-oriented directional lamellar microstructure with carbon microalloying *** creep behavior and mechanism for the improvement in creep properties by carbon addition were investigated by mechanical tests and electron microscopy *** results show that obvious improvements on the creep properties at 760°C and 276 MPa are achieved by 0.1 at.%C addition into TiAl alloy with directional lamellar microstructure,which promotes the creep strain and minimum creep rate decreasing with a large *** minimum creep rate is reduced from 4.37×10^(-8) to 3.97×10^(-9) s^(-1),and the duration entering into creep acceleration is prolonged for more than 10 *** mechanism for creep property improvement by 0.1%C addition is attributed to two *** first one is that Ti_(2) AlC is found to be strong obstacles of 1/2[110]dislocations when moving across the lamellar interface in the carbon containing *** other one is that the in terfacial dislocatio ns are effectively impeded and the release process is hindered by dynamic precipitation of Ti_(3) AlC,which is proposed to be the special mechanism for creep resistance improvement of this hard-oriented directional lamellar microstructure.

关键词： Cast titanium aluminide Lamellar microstructure Creep behavior Carbon addition Dynamic precipitation

Acetylcholine modulates transient outward potassium channel in acutely isolated cerebral cortical neurons of rats

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Neural Regeneration Research 2009年第6期4卷 436-442页

作者： Lanwei Cui Tao Sun Lihui qu Yurong Li Haixia wen Department of Paediatrics First Affiliated Hospital of Harbin Medical University Harbin 150001 Heilongjiang Province China Harbin Institute of Technology Harbin 150001 Heilongjiang Province China

BACKGROUND： The neuronal transient outward potassium channel has been shown to be highly associated with acetylcholine. However, the influence of acetylcholine on the transient outward potassium current in cerebral cortical neurons remains poorly understood. OBJECTIVE： To investigate acetylcholine modulation on transient outward potassium current in rat parietal cortical neurons using the whole-cell patch-clamp technique. DESIGN, TIME AND SETTING： A neuroelectrophysiology study was performed at the Department of Physiology, Harbin Medical University between January 2005 and January 2006. MATERIALS： Wistar rats were provided by the Animal Research Center, the Second Hospital of Harbin Medical University; PC-IIC patch-clamp amplifier and IBBClamp data collection analysis system were provided by Huazhong University for Science and Technology, Wuhan, China; PP-83 microelectrode puller was purchased from Narrishage, Japan. METHODS： The parietal somatosensory cortical neurons were acutely dissociated, and the modulation of acetylcholine （0.1, 1, 10, 100 μmol/L） on transient outward potassium channel was recorded using the whole-cell patch-clamp technique. MAIN OUTCOME MEASURES： Influence of acetylcholine on transient outward potassium current, potassium channel activation, and inactivation. RESULTS： The inhibitory effect of acetylcholine on transient outward potassium current was dose- and voltage-dependent （P 〈 0.01）. Acetylcholine was found to significantly affect the activation process of transient outward potassium current, i.e., the activation curve of transient outward potassium current was left-shifted, while the inactivation curve was shifted to hyperpolarization. Acetylcholine significantly prolonged the time constant of recovery from inactivation of transient outward potassium current （P 〈 0.01）. CONCLUSION： These results suggest that acetylcholine inhibits transient outward potassium current by regulating activation and inactivation processes of the transient o

关键词： transient outward potassium channel whole-cell recording acetylcholine cortex