检索结果-南通市图书馆

An investigation of changes in water quality throughout the drinking water production/distribution chain using toxicological and fluorescence analyses

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2020年第1期32卷 310-318页

作者： Xue Han Xin Ji Xuan Ma jun-ling liu Zhen-Yu He Wei Chang Fei Tang Ai-Lin liu Key Laboratory of Environment and Health Ministry of Education&Ministry of Environmental Protectionand State Key Laboratory of Environmental Health(Incubating)School of Public HealthTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Wuhan Center for Disease Control and Prevention Wuhan 430015China School of Public Health Wuhan University of Science and TechnologyWuhan 430030China

Changes in water quality from source water to finished water and tap water at two conventional drinking water treatment plants(DWTPs)were *** the routine water quality testing,Caenorhabditis elegans-based toxicity assays and the fluorescence excitation–emission matrices technique were also *** DWTPs supplied drinking water that met government *** current test conditions,both the investigated finished water and tap water samples exhibited stronger lethal,genotoxic and reprotoxic potential than the relative source water sample,and the tap water sample was more lethal but tended to be less genotoxic than the corresponding finished water ***,the nearly complete removal of tryptophan-like substances and newly generated tyrosine-like substances were observed after the treatment of drinking water,and humic-like substances were identified in the tap *** on these findings,toxic pollutants,including genotoxic/reproductive toxicants,are produced in the drinking water treatment and/or distribution ***,further studies are needed to clarify the potentially important roles of tyrosine-like and humic-like substances in mediating drinking water toxicity and to identify the potential sources of these ***,tryptophan-like fluorescence may be adopted as a useful parameter to monitor the treatment performance of *** observations provided insights into the importance of utilizing biotoxicity assays and fluorescence spectroscopy as tools to complement the routine evaluation of drinking water.

关键词： Bioassay C.elegans EEM Water treatment Distribution system

An improved methodology for evaluating energy service demand for China's passenger transport sector

在线全文

学校读者我要写书评

暂无评论

Advances in Climate Change Research 2022年第2期13卷 290-300页

作者： jun-ling liu Meng-Yue LI Yuan ZENG Ming-Jian YIN Xiao-Xuan ZHANG School of Economics and Management School of Humanities and Social SciencesHarbin Institute of TechnologyShenzhen 518055China Environmental Science and New Energy Technology Engineering Laboratory Tsinghua-Berkeley Shenzhen InstituteShenzhen 518055China

China's energy service demand statistics for the passenger transport sector only cover travel activities for business *** incomplete data have made it very difficult to conduct long-term scenario analysis for this ***,this study develops a methodology by refining and combining vehicle activity and travel behavior *** taking advantage of the two methods,the extent of uncertainty in estimates can be reduced.A detailed description of China's energy service demand in the passenger transport sector for the years 2013,2015,and 2017 are *** show that there is a significant underestimation of total passenger transport turnover in governmental *** reevaluation,the total passenger turnover doubled and increased by 146%,167%,and 187%,resulting in national total passenger turnover of 6783,8031,and 9406 billion passenger kilometers in 2013,2015,and 2017,*** majority of missing statistics are caused by not accounting for non-operational road transport,which is dominated by private *** adjustment,the road sector share in total passenger turnover grew substantially from 30%to 40%to approximately 75%,with the proportion of urban travel continuing to *** found that without complete data on China's passenger turnover,it may result in more than three-fold overestimation for future travel demand,leading to inaccurate projections with much higher energy consumption and CO_(2) *** is therefore very important to have a detailed and precise calculation of energy service demand in the passenger transport *** estimation framework and step-by-step process can also be applied to other developing countries which are confronting similar statistical issues.

关键词： Energy service demand Passenger transport turnover Evaluation method China

Theoretical Study on the Reaction Mechanism of CH2F Radical with HNCO

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2006年第5期19卷 451-456页

作者： Lai-cai Li Jing Shang jun-ling liu Department of Chemistry Sichuan Normal University Chengdu 510055 China

The reaction mechanism of CH2F radical with HNCO was investigated by density functional theory （DFT） at the B3LYP/6-311＋＋G（d,p） level. The geometries of the reactants, the intermediates, the transition states and the products were optimized. The transition states were verified through the vibration analysis. The relative energies were calculated at the QCISD（T）/6-311＋＋G^＊＊//B3LYP/6-311＋＋G（d,p） level. Seven feasible reaction pathways of the reaction were studied. The results indicate that the pathway （5） is the most favorable to occur, so it is the main pathway of the reaction.

关键词： CH2F radical Isocyanic acid Reaction mechanism Activation barrier

Effects of electroacupuncture on cardiac and gastric activities in acute myocardial ischemia rats

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2008年第42期14卷 6496-6502页

作者： Shu-Bin Wang Shu-Ping Chen Yong-Hui Gao jun-ling liu Ming-Fu Luo Department of Acu-moxibustion GeneralHospital of Coal Beijing 100028 China Department of Physiology Institute of Acu-moxibustion China Academy of Chinese Medical Sciences Beijing 100700 China Department of Anatomy Institute of Acu-moxibustion China Academy of Chinese Medical SciencesBeijing 100700 China

AIM： To observe the effect of electroacupuncture （EA） of ＂Neiguan＂（PC6） and ＂Gongsun＂（SP4） on pathological changes of the heart and stomach in rats with acute myocardial ischemia （AMI）, and to explore its underlying mechanism. METHODS： Fifty Wistar rats were randomized into control, model, PC6, SP4 and PC6 ＋ SP4 groups （n = 8 each group）. An AMI model was established by occlusion of the descending anterior branch （DAB） of the left coronary artery. ECG-ST of cervico-thoracic lead and electrogastrogram （EGG） were recorded. EA was applied to PC6, SP4 and PC6 ＋ SP4 groups, respectively. At the end of experiments, the rats were transcardicalty perfused with 4% paraformaldehyde, and the heart base myocardium, gastric antrum and duodenum tissues were sampled, sectioned and stained with a reduced form of nicotinamideadenine dinucleotide phosphate （NADPH）-diaphorase histochemical method for displaying nitric oxide synthase （NOS） activity. RESULTS： After AMI, ECG-ST values elevated. After EA, the elevated ECG-ST values at 20 min in PC6group, at 30 min in PC6 ＋ SP4 and SP4 groups had no significant differences in comparison with their respective basal values before AMI. Following AMI, the amplitude and frequency of slow waves of EGG decreased remarkably （P 〈 0.05）. At 30 min after EA, the mean amplitude and frequency of slow waves of EGG in the three EA groups had no marked differences compared with their individual basal levels and those in the control group. After AMI, the mean integral grey values of NOS-positive product in myocardium, gastric antrum and duodenum tissues in the model group increased remarkably in comparison with the control group, while those in three EA groups were lower than those in the model group. No significant differences were found in ECG-ST and EGG improvement among the three EA groups. However, EA of PC6 had a better effect on ECG-ST and EA of PC4 had a better effect on EGG, respectively. CONCLUSION： EA of PC6, SP4 and PC6 ＋ SP4 can significantl

关键词： Electroacupuncture Myocardial ischemia ECG-ST Electrogastrogram Heart base Gastricantrum Duodenum Nitric oxide synthase expression

Stent-grafts for the treatment of TIPS dysfunction:Fluency stent vs Wallgraft stent

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2013年第30期19卷 5000-5005页

作者： Xue-Feng Luo ling Nie Zhu Wang Jiaywei Tsauo ling-jun liu Yang Yu Biao Zhou Cheng-Wei Tang Xiao Li Department of Gastroenterology West China HospitalSichuan University Department of Interventional Radiology West China HospitalSichuan University Department of Pathology West China HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina

AIM:To evaluate the clinical efficacy of an expanded polytetrafluoro-ethylene-covered Fluency stent compared with that of a polyethylene terephthalate-covered Wallgraft stent for the management of transjugular intrahepatic portosystemic shunt(TIPS)***:A retrospective review of patients who underwent TIPS revision with stent-grafts between May 2007 and june 2011 was *** patients were divided into two groups according to the stentgrafts implanted:the Fluency stent(Bard Incorporated,Karlsruhe,Germany)and the Wallgraft stent(Boston Scientific,Galway,Ireland).The primary patency rates were calculated and compared using the Kaplan-Meier ***:A total of 73 patients were evaluated in this study:33 with Fluency stents and 40 with Wallgraft *** primary patency rates at 12 and 24 mo were 91% and 85%,respectively,in the Fluency stent group and 78% and 63%,respectively,in the Wallgraft stent *** primary shunt patency rates after TIPS revision were significantly better with the Fluency stent than with the Wallgraft stent(P = 0.033).CONCLUSION:TIPS revision with the Fluency stent has higher medium-term patency rates than that with the Wallgraft stent.

关键词： Expanded polytetrafluoroethylene-covered stent-grafts Transjugular intrahepatic portosystemic shunt dysfunction Revision Fluency

ESR studies on reactions of dicyclopentadienyl dicarbonyl titanium with organic halides

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 1991年第3期9卷 205-211页

作者： WANG,Ji-Tao BAI,ling-jun liu,Feng-Quan Department of Chemistry,Nankai University,Tianjin 300071 Department of Chemistry Nankai University Tianjin 300071

ESR method was used to elucidate the mechanism of the reactions of alkyl,allyl or benzyl halides with dicyclopentadienyldicarbonyl *** paramagnetic intermediates of the reac- tions were identified during the course of the *** reaction mechanism based on ESR find- ings and the products analyses is postulated to operate on radical *** alkyl halides were used to react with the organometallic compound 1,the intermediate found was[Cp_2Ti(CO)X](C), and the main product was identified to be dicyclopentadienyl-acyl-halo titanium(3),an insertion of TiCO into R-X,i.e.[Cp_2Ti-C(O)R]*** allyl or benzyl halidcs were used,the intermediate found was[Cp_2TiX](B),and the main products were identified to be the dicyclopentadienyl titanium dihalides and the coupling products of allyl or benzyl groups.

关键词： ESR studies on reactions of dicyclopentadienyl dicarbonyl titanium with organic halides

Sedimentary characteristics and internal architecture of a river-dominated delta controlled by autogenic process:implications from a flume tank experiment

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2019年第6期16卷 1237-1254页

作者： Wen-Jie Feng Chang-Min Zhang Tai-Ju Yin Yan-Shu Yin jun-ling liu Rui Zhu Qing-Hai Xu Zhe Chen School of Geosciences Yangtze UniversityWuhan 430100HubeiChina

Autogenic processes are widely found in various sedimentary systems and they play an important role in the depositional evolution and corresponding sedimentary ***,autogenic processes are often affected by changing allogenic factors and are difficult to be identified and analyzed from modern and ancient *** the flume tank experiment under constant boundary conditions,the depositional process,evolution principles,and the sedimentary architecture of a river-dominated delta was presented,and a corresponding sedimentary architecture model was *** evolution of river-dominated delta controlled only by autogenic process is obviously periodic,and each autogenic cycle can be divided into an initial progradational stage,a middle retrogratational stage,and a late aggradational–progradational *** the initial progradational stage,one feeder channel incised into the delta plain,mouth bar(s)was formed in front of the channel mouth,and small-scale crevasse splays were formed on the delta *** the middle retrogradational stage,the feeder channel was blocked by the mouth bar(s)which grew out of water at the end of the initial stage,and a set of large-scale distributary splay complexes were formed on the delta *** distributary splay complexes were retrogradationally overlapped due to the continuous migration of the bifurcation point of the feeder *** the late aggradational–progradational stage,the feeder channel branched into several radial distributary channels,overlapped distributary channels were formed on the delta plain,and terminal lobe complexes were formed at the end of distributary *** three sedimentary layers formed in the three stages constituted an autogenic *** experimental delta consisted of six autogenic depositional *** allocation of accommodation space and the following adaptive sediments filling were the two main driving factors of the autogenic evolution of deltas.

关键词： River-dominated delta Autogenic process Depositional process Sedimentary architecture Flume tank experiment

Dry eye and corneal sensitivity after small incision lenticule extraction and femtosecond laser-assisted in situ keratomileusis:a Meta-analysis

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2017年第4期10卷 632-638页

作者： Wen-Ting Cai Qing-Yu liu Cheng-Da Ren Qing-Quan Wei jun-ling liu Qian-Yi Wang Ya-Ru Du Meng-Mei He Jing Yu Department of Ophthalmology Shanghai Tenth People's Hospital Tongji University School of Medicine Shanghai 200072 China Nanchang University Nanchang 330031 Jiangxi ProvinceChina Nanjing Medical University Nanjing 210029 Jiangsu ProvinceChina

AIM：To assess the corneal sensitivity and the incidences of dry eye after small incision lenticule extraction（SMILE） and femtosecond laser-assisted in situ keratomileusis（FSLASIK）.METHODS：The Meta-analysis was performed using Rev Man *** searched on Pub Med from inception to March *** weighted mean difference（WMD） and 95% confidence intervals（CIs） were used to analyze the ***-effects or fixed-effects models were chosen up to between-study *** main outcomes were composed of the Ocular Surface Disease Index（OSDI） scores,tear film break-up time（TBUT）,Schirmer Test and corneal ***：Eight eligible studies including 772 eyes（386 in SMILE group and 386 in FS-LASIK group） were *** parameters have no significiant difference heterogeneity between SMILE and FS-LASIK group *** were significant differences between the two groups in OSDI scores at one and three months postoperatively,in TBUT at one and three months postoperatively,in corneal sensitivity at one week,about one month and three months ***,there was no significant difference observed in Schirmer Test at the follow-up ***：Compare to FS-LASIK,dry eye and the corneal sensitivity recover better in the SMILE group,in first three months after the surgery.

关键词： dry eye corneal sensation small incision lenticule extraction femtosecond laser-assisted in situ keratomileusis Meta-analysis

Antioxidative activity of protein hydrolysates from anchovy

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 Chemistry and Chemical Engineering 2008年第6期2卷 56-59,65页

作者： DING Li-jun LAI Xue-ling liu Xiao-qing Department of Food Science and Bioengineering Faculty of Chemical Engineering and Light lndust~ Guangdong University of Technology Guangzhou510006 China

Alcalase hydrolyzed protein from Anchovy under controlled condition, and the hydrolysates were rich in active peptides. The peptide content was determined by TCA-biuret method, and amino acid was determined by Ninhydrin. The antioxidative activity of the hydrolysates was investigated by measuring the reducing ability, the inhibition of lipoxygenase activity, and antioxidative ability in linoleic acid oxidation system. The hydrolysates exhibited high antioxidative activity. In addition, the hydrolysates scavenged 58.38% on hydroxyl radical and 46.88% on superoxide radical.

关键词： protein hydrolysatey peptides antioxidative activity free radicals anchovy