检索结果-南通市图书馆

Chinese Chemical Letters 2007年第6期18卷 714-717页

作者： jun ping xiao Qing Xiang Zhou Hua Hua Bai Department of Chemistry University of Science and Technology Beijing Beijing 100083 China School of Chemistry and Environmental Sciences Henan Normal University Henan Key Laboratory for Environmental pollution Control Xinxiang 453007 China

A procedure for the preconcentration of copper was described in this paper using multi-walled carbon nanotubes (MWCNTs) oxidized by potassium permanganate as the adsorbent for the enrichment of trace copper in water samples. Important parameters, such as the sample pH, the concentration and volume of eluent, sample flow rate and volume, and interference of coexisting ions, were investigated. The obtained results indicated that proposed method possessed an excellent analytical performance. The linear range, the detection limit, and precison (RSD) were 1–100 ng/mL (R(2) = 0.9993), 0.32 ng/mL and 2.88%, respectively. The results showed that copper could be adsorbed quantitatively on the pretreated MWCNTs with potassium permanganate, and proposed method was very useful in the monitoring of copper in the environment.

关键词： Multi-walled carbon nanotubes Solid phase extraction (SPE) Flame atomic absorption spectrometry

Determination of aniline in environmental water samples by alternating-current oscillopolarographic titration

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2007年第6期18卷 730-733页

作者： jun ping xiao Qing Xiang Zhou xiao Ke Tian Hua Hua Bai Xian Fa Su Department of Chemistry University of Science and Technology Beijing Beijing 100083 China School of Chemistry and Environmental Sciences Henan Normal University Henan Key Laboratory for Environmental Pollution Control Xinxiang 453007 China

A new method for the determination of aniline in environmental water based on oscillopolarographic titration was presented in this paper. Several factors including the kind, concentration, and volume of acid, the dosage of potassium bromide, the temperature and concentration of concomitant substances were investigated in detail. The experimental results indicated that this method was simple, rapid, and sensitive. The linear range was 8.367 × 10(?4) to 2.789 × 10(?2) mol L(?1), the relative standard deviation (R.S.D.) was lower than 0.96%, and the spiked recoveries of aniline in environmental water samples were in the range of 99.4–106.9% under the optimal conditions. The results indicated that the present method could be used as an alternative method for aniline determination in realworld water samples.

关键词： Alternating-current oscillopolarographic titration Aniline Potassium bromide

Enhancement of Sensitivity for Determination of Phenols in Environmental Water Samples by Single-drop Liquid Phase Microextraction Using Ionic Liquid prior to HPLC

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2006年第8期17卷 1073-1076页

作者： Qing Xiang ZHOU jun ping xiao Cun Ling YE Xin Ming WANG School of Chemistry and Environmental Sciences Henan Key Laboratory for Environmental Pollution Control Henan Normal University Xinxiang 453007 Department of Chemistry University of Science and Technology Beijing Beijing 100083 State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640

A single-drop liquid phase micro-extraction procedure using 1-butyl-3-methylimidazolium hexafluorophosphate （[C4MIM][PF6]） was demonstrated for the sensitive determination of four phenols in water samples. Under the optimized conditions, the linear range of proposed method was excellent in the range of 0.5-100 μg·L^-1, the reproducibility （RSD, n=6） were in the range 5.4%-8.9% and detection limits （S/N=3） were 0.3, 0.3, 0.5 and 0.5 μg·L^-1 for 2, 4-dichlorophenol, 2-naphthol, 2-nitrophenol and 4-chlorophenol, respectively. The experimental results indicated that the effect of complex matrices natural water samples could be resolved with addition of sodium ethylene diamine tetracetate （EDTA） into the samples. Excellent spiked recoveries were achieved for these four phenols ranged from 86.2%-114.9 %. All these facts demonstrated that the proposed method with merits of low cost, simplicity and easy operating would be a competitive alternative procedure for the determination of such compounds at trace level.

关键词： 1-Butyl-3-methylimidazolium hexafluorophosphate single-drop liquid phase microextraction phenols.

Sensitive determination of fenpropathrin,cyhalothrin and deltamethrin in environmental water samples using multiwalled carbon nanotubes cartridge prior to HPLC

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2008年第1期19卷 95-98页

作者： Qing Xiang Zhou Guo Hong Xie jun ping xiao Wei Dong Wang Yu Jie Ding School of Chemistry and Environmental Sciences Henan Normal University Henan Key Laboratory for Environmental Pollution Control Key Laboratory for Yellow River and Huaihe River Water Environment and Pollution Control Ministry of Education Xinxiang 453007 China College of Resources and Environment Henan Institute of Science and Technology Xinxiang 453003 China Department of Chemistry University of Science and Technology Beijing Beijing 100083 China

This paper described a new method for the trace determination of fenpropathrin, cyhalothrin and deltamethrin using multiwalled carbon nanotubes （MWCNTs） cartridge. Important parameters, such as the sample pH, eluent and its volume, sample flow rate and sample volume were investigated in detail. The linear ranges, the detection limits, and precisions （R.S.D.） were in the range of 0.1- 40 μg L^-11, 1.34.3 ng L^-1 and 2.3-2.8%, respectively. The performance of the proposed method was validated with real water samples, and the spiked recoveries were in the range of 91.7-117.8%, respectively. The experimental results demonstrated that the proposed method was an excellent alternative for the routine analysis of such pollutants in environmental samples. 2007 Qing Xiang Zhou. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： Multiwalled carbon nanotubes Fenpropathrin Cyhalothrin Deltamethrin High performance liquid chromatography

Expression of aquaporin 8 in colonic epithelium with diarrhoeapredominant irritable bowel syndrome

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2007年第4期120卷 313-316页

作者： WANG jun-ping HOU xiao-hua Department of Gastroenterology Union Hospital of Tongji MedicalCollege Huazhong University of Science and Technology Wuhan430022 China

Background We analysed and compared the aquaporin 8 （AQP8） expression in ascending and descending colon mucosa between patients with diarrhoea-predominant irritable bowel syndrome （D-IBS） and healthy volunteers, in order to study the relationship between the clinical feature of IBS, the expression of AQP8 and the pathological mechanism of D-IBS. Methods Specimens were taken from the proximal ascending colon or distal descending colon of D-IBS patients （n=-26） and healthy volunteers （n=30）, and AQP8 mRNA expression of each specimen was determined by fluorescent quantitative reverse transcription polymerase chain reaction （FQ-RT-PCR）. In patients with D-IBS, the relationship was analysed between AQP8 expression in both ascending and descending colons and clinical features including gender, age of onset, duration of illness, frequency of defecation, and stool characteristics. Results Although AQP8 was present in the epithelium of the ascending and descending colons in healthy persons and D-IBS patients, the AQP8 level of the D-IBS patients was significantly lower than that of the healthy persons （P〈0.01 in the ascending colon, P〈0.05 in the descending colon）. AQP8 expression was not correlated with the age of patients with D-IBS （P〉0.05 both in the ascending and descending colons） or the age at the onset （P〉0.05 both in the ascending and descending colons）, but closely with the duration of illness （P〈0.05 in the ascending colon, P〈0.01 in the descending colon）, frequency of defecation （P〈0.01 in the ascending colon, P〈0.05 in the descending colon） and stool characteristics （P〈0.01 in the ascending colon, P〉0.05 in the descending colon）. Conclusions The decreased AQP8 expression in D-IBS patients indicates that dysfunction of colonic absorption may cause reduced water absorption, loose stool and diarrhoea. The expression of AQP8 may be related to D-IBS.

关键词： irritable bowel syndrome, diarrhoea-predominant aquaporin 8

Tectonic evolution and accumulation characteristics of Carboniferous shale gas in Yadu-Ziyun-Luodian aulacogen, Guizhou Province, South China

在线全文

学校读者我要写书评

暂无评论

China Geology 2023年第4期6卷 646-659页

作者： Kun Yuan Wen-hui Huang Ting Wang Shi-zhen Li Xiang-can Sun Xin-xin Fang jun-ping xiao jun Guo Oil and Gas Resources Survey China Geological SurveyMinistry of Natural ResourcesBeijing 100083China China University of Geosciences(Beijing) Beijing 100083China The key Laboratory of Unconventional Oil and Gas Geology China Geological SurveyBeijing 100083China Institute of Geomechanics Chinese Academy of Geological SciencesBeijing 100081China No.814 Geological Party East China Bureau of Mineral Exploration and DevelopmentZhenjiang 212005China Hunan Institute of Geophysics and Geochemistry Changsha 410000China

The Yadu-Ziyun-Luodian aulacogen(YZLA) developed into being NW-trending in the Late Paleozoic,and was considered as an important passive continental margin aulacogen in Guizhou Province, South China. This tectonic zone is considered a large intracontinental thrust-slip tectonic unit, which has undergone a long period of development. It was ultimately determined in the Yanshanian, where the typical Upper Paleozoic marine shales were deposited. In 2021, Well QSD-1 was deployed in the Liupanshui area at the northwest margin of the aulacogen, and obtained a daily shale gas flow of 11011 m3in the Carboniferous Dawuba Formation. It thus achieved a breakthrough in the invesgation of shale gas in the Lower Carboniferous in South China, revealing relatively good gas-bearing properties and broad exploration prospects of the aulacogen. Being different from the Lower Paleozoic strata in the Sichuan Basin and the Yichang area of the Middle Yangtze, the development of the Carboniferous Dawuba Formation in the aulacogen exhibits the following characteristics:(1) The Lower Carboniferous shale is thick and widely distributed, with interbedded shale and marlstone of virous thickness;(2) The total organic carbon(TOC) content of the shale in the Dawuba Formation ranges from 1% to 5%, with an average of 2%, and the thermal maturity of organic matter(Ro) varies from 1% to 4%, with an average of2.5%, indicating good hydrocarbon generation capacity;(3) The main shale in the aulacogen was formed during the fault subsidence stage from the Middle Devonian to the Early Permian. Although the strong compression and deformation during the late Indosinian-Himalayan played a certain role in destroying the formed shale gas reservoirs, comparative analysis suggests that the area covered by the current Triassic strata has a low degree of destruction. It therefore provides good conditions for shale gas preservation,which can be regarded as a favorable area for the next exploration.

关键词： Shale gas Aulacogen Carboniferous Shale and marlstone Organic carbon Organic matter Hydrocarbon generation capacity Tectonic evolution Accumulation characteristics

Optical Antenna System Design for 3D Imaging Lidar

在线全文

学校读者我要写书评

暂无评论

Journal of Electronic Science and Technology 2011年第1期9卷 67-70页

作者： Hua-jun Yang xiao-ping Huang the School of Physical Electronics University of Electronic Science and Technology of China Chengdu 610054 China

A new aspheric surface pre-collimation lenses system for the optical antenna of three-dimensional （3D） imaging of lidar has been optimally designed and simulated by optical design software *** kinds of aspheric surfaces spherical lenses including the sections of spherical,elliptical,hyperbola,and parabola have been *** optical system,including the elliptical cylinder lenses collimation and the optical antenna,can be realized less than 5 rad collimation angle for dot source semiconductor laser beam.

关键词： Aspheric surface pre-collimation lenses system optical antenna three-dimensional imaging lidar.

Value of T cell receptor gamma alternate reading frame protein and keratin 5 in endometrial carcinoma

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2013年第22期126卷 4260-4264页

作者： ZHAO Li-jun LI xiao-ping QI Wen-juan WANG Jian-liu WEI Li-hui Department of Obstetrics & Gynecology Peking University People's Hospital Beijing 100044 China

Background Tumors with different gene expression develop and progress in different ways. To deepen our understanding of the progression in endometrial cancer, and provide a useful tool for accurate diagnosis and prognosis assessment, we identified the new molecular prognostic markers in endometrial carcinoma and analyzed the relationship of them with clinical and pathological features of endometrial carcinoma. Methods Ninety-four cases of endometrial endometrioid adenocarcinoma with complete data from the Peking University People＇s Hospital from 2000 to 2008 and 40 cases of normal endometrium were enrolled. Among these, 30 endometrial endometrioid adenocarcinoma samples of different International Federation of Gynecology and Obstetrics （FIGO） stage were selected for further Agilent genome-wide microarray analysis. Significance analysis of microarrays （SAM） was used to identify genes that are significantly associated with tumor progress. Immunohistochemistry was utilized to identify the genes of interest in endometrial carcinoma and normal endometrium. The relationship between the genes and the age, clinical stage, histological grade, myometrium invaded depth, lymph node metastasis status, and the expression of ER, PR, P53, and PTEN were analyzed by X2 test. Results Analysis between FIGO 1988 stage I and stage III identified a 362-gene ＂progress signature＂; 171 downregulated and 191 up-regulated genes. Among the alterative genes, TARP （T cell receptor gamma alternate reading frame protein） and KRT5 （keratin 5） decreased 3.57 fold and 5.8 fold in FIGO stage III patients. The expression of TARP in endometrial carcinoma increased compared to normal endometrium, while that of KRT5 decreased （P〈0.05）. The expression of TARP and KRT5 decreased when stage, histological grading, myometrium invaded depth increased （P〈0.05）. In the cases with lymph node metastasis, the expression of TARP decreased, while the expression of KRT5 did not differ （both P〈0.05） both. The expression

关键词： endometrial cancer T cell receptor gamma alternate reading frame protein keratin 5

Effects of insulin, insulin-like growth factor-I and -II on proliferation and intracellular signaling in endometrial carcinoma cells with different expression levels of insulin receptor isoform A

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2013年第8期126卷 1560-1566页

作者： WANG Chun-fang ZHANG Guo ZHAO Li-jun LI xiao-ping QI Wen-juan WANG Jian-liu WEI Li-hui Department of Obstetrics and Gynecology Peking UniversityPeople's Hospital Beijing 100044 China

Background Hyperinsulinemia, insulin-like growth factor （IGF）-I and -Ⅱ （IGF-Ⅱ） are associated with increased risk of endometrial carcinoma. Insulin receptor isoform A （IR-A） is more frequently expressed in endombtrial carcinoma than in normal endometrial tissues. To better understand their roles in endometrial carcinoma, we investigated the effects of insulin, IGF-I, and IGF-II in endometrial carcinomas cells with different IR-A expression levels. Methods To explore the role of IR-A in mediating the activity of IGF-I, IGF-II, and insulin, we investigate the cellular proliferation of endometrial carcinoma cell lines RL95-2 and RL95-2-1R-A by MTS assays. Then we examined the protein kinase Akt phosphorylation and extracellular signal-regulated kinase （ERK） 1/2 phosphorylation in both cell lines by Western blotting. The effect of IGF-II and AG1024 on cell cycle progression and apoptosis was assessed by fiowcytometry. To examine whether the effects of IGFs were mediated by IR-A, we blocked IGF-I receptor （IGF-IR） in both cell lines using AG1024, an IGF-IR-specific inhibitor. Results IGF-I and IGF-II significantly enhanced proliferation of both cell lines （P 〈0.05）. By contrast, insulin significantly increased proliferation of RL95-2-1R-A cells only （P 〈0.05）. IGF-I and IGF-II significantly increased pAkt levels in RL95-2 cells and pERK1/2 levels in RL95-2-1R-A cells （all, P 〈0.05）. Insulin increased pERK1/2 levels in RL95-2-1R-A cells only （P 〈0.05）. LY294002 and PD98059 inhibited the specific signaling activities and cellular proliferation. After AG1024 pretreatment, neither IGF-I nor IGF-II affected pAkt levels in RL95-2 cells. IGF-II, but not IGF-I, increased pERK1/2 levels in RL95-2-1R-A cells. After AG1024 pretreatment, the proliferation rate and DNA content corresponding to the S phase increased and apoptosis decreased significantly in IGF-II-treated RL95-2-1R-A cells only （P 〈0.05）. Conclusions The proliferation effect of insulin is mediated by IR-A. When IR-A do

关键词： endometrial carcinoma, insulin receptor isoform A insulin, insulin-like growth factor-I insulin-like growth factor-Ⅱ

The First Chinese Case of Creutzfeldt-Jakob Disease with Mutation of E200K in PRNP

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

Biomedical and Environmental Sciences 2010年第2期23卷 158-160页

作者： CHEN GAO QI SHI WEI ZHOU CHAN TIAN HHUI-YING JIANG BAO-YUN ZHANG jun HAN xiao-ping DONG State Key Laboratory for Infectious Disease Prevention and Control National Institute for Viral Disease Control and Prevention Chinese Center for Disease Control and Prevention Beijing 102206 China

Objective To investigate epidemiological, clinical and genetic features of the first Chinese case of Creutzfeldt-Jakob disease （CJD） with mutation of E2OOK in PRNP. Methods The general epidemiological and clinical data were collected; CSF 14-3-3 protein was analyzed by Western blot; The PRNP was amplified by PCR and analyzed. Results A missense mutation in codon 200 （E200K） of the PRNP was identified in this patient; CSF 14-3-3 protein was positive; sleep disturbance was the initial sign and the other symptoms gradually appeared, including memory loss, dizziness and ataxia. Conclusion The CJD patient who was first reported in China has a missense mutation in codon 200 （E200K） of the PRNP, and the codon 129 is a methionine homozygous genotype.

关键词： CJD PRNP Sleep disturbance 14-3-3