检索结果-南通市图书馆

Electrocatalytic Oxidation and Simultaneous Determination of Uric Acid,Xanthine,Hypoxanthine and Dopamine Based on β-Cyclodextrin Modified Glassy Carbon Electrode

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2012年第6期28卷 1047-1053页

作者： GONG Wei DOU Zhi-yu CUI Li-li LIU Da-jun HE xing-quan Department of Chemistry and Chemical Engineering Changchun University of Science and Technology Changchun 130022 P. R. China

A novel covalently modified glassy carbon electrode with β-cyclodextrin was prepared via electropolymerization technique for the simultaneous determination of uric acid（UA）,xanthine（XA）,hypoxanthine（HX） and dopamine（DA）.This new electrode presented an excellent electrocatalytic activity towards the oxidation of UA,XA,HX and DA by cyclic voltammetry（CV） *** oxidation peaks of the four compounds were well defined and had the enhanced peak *** separation potentials of the oxidation peaks for DA-UA,UA-XA and XA-HX were 150,390 and 360 mV in CV,*** means of differential pulse voltammetry（DPV） method,the calibration curves in the ranges of 10―225,5―105,10―170 and 5―150 μmol/L were obtained for UA,XA,HX and DA,*** lowest detection limits（S/N=3） were 5,1.25,5 and 1.5 μmol/L for UA,XA,HX and DA,*** practical application of the modified electrode was demonstrated by the determination of DA in hydrochloride injection and UA,XA,HX in human urine samples.

关键词： β-Cyclodextrin Uric acid Xanthine Hypoxanthine Dopamine

Comparison of phytotoxicity of copper and nickel in soils with different Chinese plant species

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2015年第6期14卷 1192-1201页

作者： LI Bo LIU Ji-fang YANG jun-xing MA Yi-bing CHEN Shi-bao Institute of Plant Nutrition and Environmental Resources Liaoning Academy of Agricultural Sciences National Soil Fertility and Fertilizer Effects Long-term Monitoring Network Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences Centre for Environmental Remediation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences

Ecological risk assessment of metals in soils is important to develop the critical loads of metals in soils. Phytotoxicity is one of the endpoints for ecological risk assessment of soils contaminated with metals. The sensitivity of eight Chinese plant species（bok choy, mustard, tomato, green chilli, paddy rice, barley, spinach and celery） to copper（Cu） and nickel（Ni） toxicity in two Chinese soils was investigated to assess their potential use for ecological risk assessment in the region. The results showed that bok choy and mustard were the two most sensitive species to Cu and Ni toxicities. Assessment of metal accumulation by the plants demonstrated that bok choy shoot had the highest bioconcentration factor（BCF, the ratio of metal concentration in plant shoots to metal concentration in soil）. Given the importance of bok choy to agricultural production in Asia, it is therefore important that these sensitive plant species are included in species sensitivity distributions for ecological risk assessment of Cu and Ni in soils.

关键词： paddy shoot nickel tomato contaminated toxicity agricultural vegetative displayed ranged

视神经脊髓炎谱系疾病的临床特点及复发影响因素分析

在线全文

学校读者我要写书评

暂无评论

山西中医 2024年第7期40卷 51-54页

作者：张玉莹吴鹏邢俊娥黄立武广西中医药大学南宁530001 广西中医药大学第一附属医院

目的:探讨视神经脊髓炎谱系疾病患者的中西医临床特点及复发影响因素。方法:收集51例视神经脊髓炎谱系疾病患者临床资料,回顾性分析其临床特点,将51例患者分为复发组(n=31)和非复发组(n=20),采用Logistic回归分析筛选出视神经脊髓炎谱... 详细信息

目的:探讨视神经脊髓炎谱系疾病患者的中西医临床特点及复发影响因素。方法:收集51例视神经脊髓炎谱系疾病患者临床资料,回顾性分析其临床特点,将51例患者分为复发组(n=31)和非复发组(n=20),采用Logistic回归分析筛选出视神经脊髓炎谱系疾病复发的相关影响因素。结果:研究对象男女比例为1∶6.29,平均发病年龄(41.80±14.85)岁,平均发病病程[36.00(72.00,7.00)]个月,平均发病(5.06±4.51)次,有明确发病诱因16例,AQP4-IgG阳性39例,视神经、头颅和颈胸髓常受累,合并其他自身免疫性疾病抗体阳性28例,神经电生理检查异常11例,使用免疫抑制剂治疗32例。中医病位多为脾、肝、肾等,病性多为气虚、阴虚、湿、痰、阳虚、瘀、血虚、热,证型多为脾胃气虚、肝肾阴虚、脾肾阳虚、湿热阻滞、气血两虚及气滞血瘀,伴痰湿、痰热、血瘀等。AQP4-IgG阳性、长节段脊髓病灶、其他自身免疫性抗体阳性及未使用免疫抑制剂是视神经脊髓炎谱系疾病复发的危险因素(OR>1,P<0.05)。结论:视神经脊髓炎谱系疾病发病以青壮年女性为主,病程长,AQP4-IgG阳性率高,多累及视神经、头颅和颈胸髓,可合并其他自身免疫性疾病,神经电生理诱发电位多异常。中医病位多涉及脾肝肾,病机以气虚、阴虚为主,多见脾胃气虚、肝肾阴虚等证。

关键词：视神经脊髓炎谱系疾病临床特点复发因素

Effect of type 2 diabetes mellitus on flavonoid pharmacokinetics and tissue distribution after oral administration of Radix Scutellaria extract in rats

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Natural Medicines 2018年第6期16卷 418-427页

作者： ZHANG Xue-Ju LIU Shu xing jun-Peng LIU Zhi-Qiang SONG Feng-Rui National Center of Mass Spectrometry in Changchun Jilin Province Key Laboratory of Chinese Medicine Chemistry and Mass SpectrometryChangchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Chinese Academy of Sciences Beijing 100039China

Radix Scutellaria is widely applied to the treatment of diabetes mellitus in China. Its main bioactive constituents contain baicalin, wogonoside, oroxyloside, and their aglycones. To investigate the effect of type 2 diabetes mellitus on both pharmacokinetics and tissue distribution of these flavonoid compounds, the six flavonoids in plasma and tissues from the normal and type 2 diabetic rats after oral administration of Radix Scutellaria extract were simultaneously measured by ultra-performance liquid chromatography-tandem mass spectrometry(UPLC-MS/MS) method. The results showed that baicalin, wogonoside, and oroxyloside had higher Cmax and AUC values(P < 0.05) in type 2 diabetic rats than that in normal rats and the tissue-distribution behaviors of the six flavonoid compounds in hearts, livers, spleens, lungs, kidneys, brains, pancreas, fat and muscle of the type 2 diabetic rats showed obviously differences from the normal rats(P < 0.05). In conclusion, the differences in the pharmacokinetics of oroxyloside and tissue distribution of the six flavanoids in Radix Scutellaria extract between diabetic and normal rats were found for the first time. The results from the present study provided a crucial basis for a better understanding of in vivo anti-diabetic mechanism of action of the six flavonoids from Radix Scutellaria.

关键词： Radix Scutellaria Diabetes mellitus Flavonoid Pharmacokinetics Tissue distribution

Effect of temperature difference load of 32 m simply supported box beam bridge on track vertical irregularity

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Transportation 2015年第4期23卷 262-271页

作者： Kaize Xie jun xing Li Wang Chunxiang Tian Rong Chen Ping Wang MOE Key Laboratory of High-Speed Railway Engineering Southwest Jiaotong University China Railway Eryuan Engineering Group Co.Ltd

In order to study the effect of temperature difference load （TDL） along the vertical direction of a simply supported beam bridge section on the vertical irregularity, a rail-bridge-piers calculation model was established. Taking 32 m simply supported box beam bridge which is widely used in the construction of pas- senger dedicated line in China as an example, influences of the temperature variation between the bottom and top of the bridge, temperature curve index, type of temperature gradient, and beam height on track vertical irregularity were analyzed with the model. The results show that TDL has more effects on long wave track irregularity than on short one, and the wavelength mainly affected is approxi- mately equal to the beam span. The amplitude of irregu- larity caused by TDL is largely affected by the temperature variation, temperature curve index, and type of temperature gradient, so it is necessary to monitor the temperaturedistribution of bridges in different regions to provide accurate calculation parameters. In order to avoid the irregularity exceeding the limit values, the height of 32, 48, and 64 m simply supported box beam bridges must not be less than 2.15, 3.2, and 4.05 m, respectively.

关键词： Simply supported beam bridge Temperaturegradient Vertical irregularity - Beam height

非洲猪瘟病毒阻断ELISA抗体检测方法的建立

在线全文

学校读者我要写书评

暂无评论

动物医学进展 2024年第3期45卷 42-47页

作者：林彦星翁巧玉阮周曦吴江黄超华金业陈鹏张彩虹杨俊兴曹琛福史卫军刘建利花群义深圳海关动植物检验检疫技术中心广东深圳518045 湖南普简生物科技有限公司湖南长沙410013 深圳市心月生物科技有限公司广东深圳518000

为建立一种非洲猪瘟病毒抗体阻断ELISA检测方法,以原核表达ASFV p72重组蛋白作为包被抗原,HRP标记的p72特异性单克隆抗体作为酶标抗体,建立了非洲猪瘟病毒抗体阻断酶联免疫吸附试验(ELISA)检测方法。结果显示,该方法中血清以1∶10稀释,... 详细信息

为建立一种非洲猪瘟病毒抗体阻断ELISA检测方法,以原核表达ASFV p72重组蛋白作为包被抗原,HRP标记的p72特异性单克隆抗体作为酶标抗体,建立了非洲猪瘟病毒抗体阻断酶联免疫吸附试验(ELISA)检测方法。结果显示,该方法中血清以1∶10稀释,酶标单抗以1∶6000稀释,临界值为50.12%。该方法特异性强,与猪流行性腹泻病毒(PEDV)、猪传染性胃肠炎病毒(TGEV)、猪瘟病毒(CSFV)、伪狂犬病病毒(PRV)和猪繁殖与呼吸综合征病毒(PRRSV)阳性血清无交叉反应。对强阳性血清的最低稀释度为1∶640,弱阳性血清的最低稀释度为1∶10,具有较高的敏感性;重复性好,批内和批间变异系数均小于5%。应用所建立的方法与商品化同类检测试剂盒对174份血清进行检测,ASFV抗体阳性符合率为100%,阴性符合率为96.75%,总符合率为97.28%。建立的阻断ELISA方法可用于非洲猪瘟病毒抗体检测。

关键词：非洲猪瘟病毒 p72蛋白单克隆抗体阻断酶联免疫吸附试验

A Diblock-Diblock Copolymer Mixture under Parallel Wall Confinement

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第4期30卷 150-153页

作者： PAN jun-xing ZHANG Jin-jun WANG Bao-Feng WU Hai-Shun SUN Min-Na School of Chemistry and Materials Science Shanxi Normal UniversityLinfen 041004

A cell dynamics simulation is performed for a diblock-diblock copolymers mixture confined between parallel *** richer morphologies are observed in the mixture than in pure diblock *** novel morphological transitions occur by changing the wall-block interaction and the distance between walls(confinement degree),and both perpendicular and parallel multilayered sandwich structures are obtained in the mixture.

关键词： walls mixture Copolymer

Can the efficiencies of simplified perovskite solar cells go higher?

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 Energy Chemistry 2021年第7期30卷 33-36页

作者： Jin-Feng Liao Wenhuai Feng jun-xing Zhong Bing-Xin Lei Wu-Qiang Wu Key Laboratory of Bioinorganic and Synthetic Chemistry(MOE) School of ChemistrySun Yat-sen UniversityGuangzhou 510275GuangdongChina School of Chemistry and Chemical Engineering Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan ProvinceHainan Normal UniversityHaikou 571158HainanChina

In recent years, metal halide perovskites have emerged as star semiconducting materials in the field of optoelectronic devices owing to their fascinating optoelectronic properties. Of particular interest are perovskite solar cells (PSCs), which have witnessed skyrocketing power conversion efficiencies (PCEs) within a short period of time, and were recently certified to reach 25.5%, which is already higher than other thin film photovoltaic technologies[1]. Nevertheless, multiple layers are still needed for state-of-theart PSCs to achieve high PCEs over 21%.

关键词： Perovskite solar cells Charge extraction Charge recombination Interfacial modification Energy level alignment

以Hailwood-Horrobin平衡水分模型分析聚葡萄糖吸潮机理

在线全文

学校读者我要写书评

暂无评论

粮油食品科技 2024年第3期32卷 140-147页

作者：刘畅王梦雅宋洪东曹子怡颉宇李兴军宁国庆上海理工大学健康科学与工程学院上海200093 国家粮食和物资储备局科学研究院粮食储运研究所北京100037 国家粮食储运工程研究中心北京100037 人良生物科技(上海)有限公司上海201800

为解释聚葡萄糖的吸潮性能,改进包装材料,在20~35℃和平衡相对湿度(ERH)10%~90%范围内,测定了初始含水率(IMC)1.01%~4.89%的5个国产样品(a1~a5)的水分吸附与解吸等温线。吸附和解吸等温线均是S型曲线,在ERH小于80%时,解吸等温线与吸附... 详细信息

为解释聚葡萄糖的吸潮性能,改进包装材料,在20~35℃和平衡相对湿度(ERH)10%~90%范围内,测定了初始含水率(IMC)1.01%~4.89%的5个国产样品(a1~a5)的水分吸附与解吸等温线。吸附和解吸等温线均是S型曲线,在ERH小于80%时,解吸等温线与吸附等温线之间存在滞后现象,样品初始含水率越低,滞后现象越显著。由于聚葡萄糖是无定形相态的粉末,我们假定聚葡萄糖水分吸附过程是蒸汽相态、液体相态(多分子层吸附)及固体溶液(单分子层吸附)之间存在的平衡,按照Hailwood-Horrobin(HH)模型把S型吸附等温线去卷积为单分子层(Mh)和多分子层成分(Md),吸附和解吸多分子层水含量随ERH增加呈现S型曲线增加,解吸单分子层含水率随ERH增加保持不变,而吸附单分子层含水率随ERH增加对a1~a4样品(IMC4.87%~2.35%)缓慢增加,对a5样品(IMC 1.01%)几乎线性减少。随着样品初始含水率降低,吸附位点聚合物分子量对a1样品最大,对a5样品最小。尽管红外光谱扫描显示a5样品羟基(3416cm^(–1))和无定形结构官能团(1027cm^(–1))的强度最小,但是a5样品的吸潮率最大。说明不同工艺加工的聚葡萄糖样品含水率越低,吸附单分子层水含量随ERH增加几乎线性减少,但是吸附多分子层含水量随ERH增加是S型增加,吸潮率和吸湿量增大。

关键词：聚葡萄糖水分吸着等温线吸潮率单分子层吸附滞后环