检索结果-南通市图书馆

American Journal of Analytical Chemistry 2015年第1期6卷 26-37页

作者： Lina Odeh Imad Odeh Mustafa Khamis Mahmoud khatib Mohannad Qurie Ziad Shakhsher Mutaz Qutob Department of Chemistry and Chemical Technology Al-Quds University Jerusalem Palestine Center for Chemical and Biological Analysis Al-Quds University Jerusalem Palestine Department of Earth and Environmental Studies Al-Quds University Jerusalem Palestine

A commercially available chelating polymer, polystyrene tris(2-aminoethyl)amine, was used for the removal of chromium from aqueous solution. The influence of pH, contact time, adsorbent dosage and initial Cr (VI) concentration on adsorption was studied. The optimum pH for the removal of Cr (VI) was at pH 5, while optimum contact time and adsorbent dosage were 120 minutes and 10 g/L, respectively. Total chromium and Cr (VI) concentrations were analyzed by ICP-MS and UV-Visible. Adsorption isotherms using Langmuir and Freundlich isotherm models revealed that the data fitted Langmuir isotherm model better than Freundlich with a maximum adsorption capacity of 312.27 mg/g. FTIR spectroscopy, Scanning electron microscopy (SEM) and Energy Dispersive Spectrometry (EDS) analyses were performed on the adsorbent before and after binding Cr (VI). All analyses confirmed the complexation of Cr (VI) to the adsorbent. Desorption experiments using KCl solution indicated 89.3% release of chromium, rendering this method of high potential for adsorbent regeneration.

关键词： Adsorption of Cr (VI) Polystyrene Tris(2-aminoethyl)amine ICP-MS SEM EDS

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

长枝木霉TlCC鉴定及其生物学特性研究

中国农学通报 2011年第5期27卷 338-345页

作者：王斌 Ali khatib Bakar 刘金亮张世宏潘洪玉吉林大学植物科学学院长春130062

从土壤中分离得到1株木霉TlCC,为明确其分类地位及其生物学特性,对该菌进行形态学鉴定和分子鉴定,并对其生长培养基、光照、温度、碳源、氮源、微量元素和pH等生物学特性进行研究。鉴定结果显示,该菌株为长枝木霉（Trichoderm longibrac... 详细信息

从土壤中分离得到1株木霉TlCC,为明确其分类地位及其生物学特性,对该菌进行形态学鉴定和分子鉴定,并对其生长培养基、光照、温度、碳源、氮源、微量元素和pH等生物学特性进行研究。鉴定结果显示,该菌株为长枝木霉（Trichoderm longibrachiatum）。生物学特性结果表明：菌株TlCC在PDA上生长量最大,查氏培养基和基本培养基上生长量最小;不同光照条件下,菌丝生长无明显差异,但在连续光照条件下可明显促进孢子产生;在15~40℃范围能够生长产孢,在35℃时菌丝生长最快,但产孢量在25~35℃最大;果糖最能促进菌丝生长,果糖、可溶性淀粉最有利于产孢;谷氨酸对菌丝生长和孢子产生都有促进作用;Cu最能促进菌丝生长,而Zn、K和Mg则对菌丝生长有一定抑制作用,Cu最有利于产孢,Zn对产孢明显抑制;在pH值在2~10范围内均可生长,在pH为5时为生长最佳,在pH值3~7范围内最有利于产孢。

关键词：木霉菌形态学鉴定 ITS 长枝木霉TlCC 生物学特性

Torsades de Pointes Secondary to Excessive Loperamide Use

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Pharmacy and Pharmacology 2016年第7期4卷 322-327页

作者： Joseph S. Van Tuylt Gail Brock Kristen Bova Campbell Sana M. Al-khatib Department of Pharmacy Practice St. Louis College of Pharmacy 4588 Parkview Place St. Louis MO 63110 Department of Medicine Duke University Hospital DUMC 3850 Durham NC 27710

Loperamide is a common, over-the-counter, antidiarrheal medication that has been implicated in cases of ventricular tachycardia. A 32 year-old female patient with a history of opioid abuse and no prior history of cardiovascular disease experienced Torsades de pointes. An electrocardiogram at the time of hospital presentation revealed a prolonged QT interval at 636 msec. Diagnostic evaluation was unremarkable for any underlying cardiovascular pathology. Further investigation revealed the patient had been taking 30-40 loperamide 2 mg tablets oral daily for 2 weeks prior to the onset of Torsades de pointes. At high doses, loperamide may prolong the QT interval through antagonism of the human ether-a-go-go potassium current, thus increasing the risk of ventricular arrhythmias. Clinicians should be cautious with administration of high doses of loperamide to all patients, especially patients at high risk for QT interval prolongation.

关键词：丁胺扭转过度继发药物滥用拮抗作用心律失常临床医生

Ascites and alpha-fetoprotein improve prognostic performance of Barcelona Clinic Liver Cancer staging

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 2015年第18期21卷 5654-5662页

作者： Asmaa I Gomaa Alzhraa Al-khatib Wael Abdel-Razek Mohammed Saad Hashim Imam Waked Hepatology Department National Liver Institute Menoufiya University Oncology Department National Liver Institute Menoufiya University

AIM: To assess how ascites and alpha-fetoprotein(AFP) added to the Barcelona Clinic Liver Cancer(BCLC) staging predict hepatocellular carcinoma ***: The presence of underlying cirrhosis, ascites and encephalopathy, Child-Turcotte-Pugh(CTP) score, the number of nodules, and the maximum diameter of the largest nodule were determined at diagnosis for 1060 patients with hepatocellular carcinoma at a tertiary referral center for liver disease in Egypt. Demographic information, etiology of liver disease, and biochemical data(including serum bilirubin, albumin, international normalized ratio, alanine and aspartate aminotransferases, and AFP) were evaluated. Staging of the tumor was determined at the time of diagnosis using the BCLC staging system; 496 patients were stage A and 564 patients were stage B. Patients with mild ascites on initial ultrasound, computed tomography, or clinical examination, and who had a CTP score ≤ 9 were included in this analysis. All patients received therapy according to the recommended treatment based on the BCLC stage, and were monitored from the time of diagnosis to the date of death or date of data collection. The effect of the presence of ascites and AFP level on survival was ***:At the time the data were censored,123/496(24.8%)and 218/564(38.6%)patients with BCLC stages A and B,respectively,had *** mean survival of the BCLC A and B patients during a three-year follow-up period was 31 mo[95%confidence interval(95%CI):29.7-32.3]and 22.7mo(95%CI:20.7-24.8),*** presenceof ascites,multiple focal lesions,large tumor size,AFP level and CTP score were independent predictors of survival for the included patients on multivariate analysis(P<0.001).Among stage A patients,18%had ascites,33%had AFP≥200 ng/m L,and 8%had *** median survival in the presence of ascites was shorter if AFP was≥200 ng/m L(19 mo vs 24 mo),and in the absence of ascites,patients with AFP≥200 ng/m L had a shorter survival(28mo

关键词： Alpha-fetoprotein Ascites Barcelona Clinic Liver Cancer Hepatocellular carcinoma Survival

The Impact of Social Media Networks Websites Usage on Students’ Academic Performance

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications and Network 2015年第4期7卷 159-171页

作者： Mahmoud Maqableh Lama Rajab Walaa Quteshat Ra’ed Moh’d Taisir Masa’deh Tahani khatib Huda Karajeh Management Information Systems Faculty of Business The University of Jordan Amman Jordan Computer Information Systems King Abdullah II School for Information Technology University of Jordan Amman Jordan

Social Networks Sites (SNSs) are dominating all internet users’ generations, especially the students’ communities. Consequently, academic institutions are increasingly using SNSs which leads to emerge a crucial question regarding the impact of SNSs on students’ academic performance. This research investigates how and to what degree the use of SNSs affects the students’ academic performance. The current research’s data was conducted by using drop and collect surveys on a large population from the University of Jordan. 366 undergraduate students answered the survey from different faculties at the university. In order to study the impact of SNSs on student’s academic performance, the research hypotheses was tested by using descriptive analysis, T-test and ANOVA. Research results showed that there was a significant impact of SNS on the student’s academic performance. Also, there was a significant impact of SNS use per week on the student’s academic performance, whereas no differences found in the impact of use of SNSs on academic performance due to age, academic achievement, and use per day to most used sites. The findings of this research can be used to suggest future strategies in enhancing student’s awareness in efficient time management and better multitasking that can lead to improving study activities and academic achievements.

关键词： Social Network Sites Academic Performance University Students T-Test ANOVA

Fractional Yield, Extract Composition and Variability from Jordanian Oil Shales

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 Analytical Sciences, Methods and Instrumentation 2016年第3期6卷 51-63页

作者： Hani M. Alnawafleh Feras Y. Fraige Khalid E. Tarawneh Ibrahim A. Sarairahc Laila A. Al-khatib Faculty of Engineering Al-Hussein Bin Talal University Ma’an Jordan Al-Muzahmiayah Branch Faculty of Engineering King Saud University Riyadh Kingdom of Saudi Arabia Faculty of Engineering Isra University Amman Jordan Faculty of Science Al-Hussein Bin Talal University Ma’an Jordan Naif Arab University for Security Sciences Riyadh Kingdom of Saudi Arabia

Surface and subsurface oil shale (OS) rocks in Jordan have potential economic value for the country and still unutilized. This research paper focuses on central and southern OS deposits in Jordan. Brief characterization of four OS deposits is presented. Size distribution test and elemental analysis were performed. Shale oil was extracted via three solvation methods: Soxhlet extraction, extraction via mixing and stirring, and lastly super-critical fluid extraction. Major shale oil fractions were obtained from extract fractionation on chromatographic column. The nuclear magnetic resonance spectroscopy technique was used to study qualitatively the fractional composition of OS extract. Results show that all studied OS deposits have quite similar trend in their particle size distribution and their elemental composition. These OS deposits are found to be varying in their solvation behavior, fractional yield, and shale oil composition. Highest yield is obtained from polar solvents. The OS extraction via solvation processes is promising under certain extraction conditions such as super-critical conditions. The solvation variability of Jordanian OS indicates that different extraction techniques suit different OS deposits. Such variability should be considered in any future extraction options.

关键词： Jordan Oil Shale Solvent Extraction Variability Fractional Yield