| 1 | Adsorptive removal of antibiotics from water using magneticion exchange resin显示文摘The occurrence of antibiotics in the environment has recently raised serious concern regarding their potential threat to aquatic ecosystem and human health. In this study, the magnetic ion exchange(MIEX) resin was applied for removing three commonly-used antibiotics, sulfamethoxazole(SMX), tetracycline(TCN) and amoxicillin(AMX) from water.The results of batch experiments show that the maximum adsorption capacities on the MIEX resin for SMX, TCN and AMX were 789.32, 443.18 and 155.15 μg/m L at 25°C,respectively, which were 2–7 times that for the powdered activated carbon. The adsorption kinetics of antibiotics on the MIEX resin could be simulated by the pseudo-second-order model(R^2= 0.99), and the adsorption isotherm data were well described by the Langmuir model(R^2= 0.97). Solution p H exhibited a remarkable impact on the adsorption process and the absorbed concentrations of the tested antibiotics were obtained around the neutral p H.The MIEX resin could be easily regenerated by 2 mol/L Na Cl solution and maintained high adsorption removal for the tested antibiotics after regeneration. Anion exchange mechanism mainly controlled the adsorption of antibiotic and the formation of hydrogen binding between the antibiotic and resin can also result in the increase of adsorption capacity. The high adsorption capacity, fast adsorption rate and prominent reusability make the MIEX resin a potential adsorbent in the application for removing antibiotics from water. | Tianyue Wang Xun Pan Weiwei Ben Jianbing Wang Pin Hou Zhimin Qiang | 2017 | Journal of Environmental Sciences2017，29，2： | 12 |
| 2 | New index to predict esophageal variceal bleeding in cirrhotic patients显示文摘AIM:To develop a safe,simple,noninvasive and affordable system to predict esophageal variceal bleeding(EVB)in decompensated cirrhosis patients.METHODS:Four hundred and eighty-six patients with decompensated cirrhosis(238 males and 248 females),with a mean age of 63.1±11.2 years,were admitted to Changshu Affiliated Hospital of Suzhou University between May 2008 and March 2011.Patients enrolled in this study underwent ultrasound-Doppler(US-Doppler)to assess left gastric vein(LGV)blood flow velocity(LGVV)and blood flow direction(LGVBFD),and were evaluated by the Model For End-Stage Liver Disease(MELD)scoring system.All patients received followup evaluations every three months.The resulting data were entered into a database after each time point collection.RESULTS:Four hundred and sixteen patients com-pleted follow-up evaluations for an average of 31.6mo(range:12 to 47 mo).Fifty-one(12.3%)patients experienced EVB.The change in the MELD score over three months(ΔMELD),LGVV and LGVBFD were independently associated with EVB occurrence.MELDUS-Doppler Index(MUI),a new index,was developed and calculated using the following logistic regression equation:MUI=Logit(P)=1.667(ΔMELD)+2.096(LGVV)-3.245(LGVBFD)-1.697.The area under the receiver operating characteristic curve for prediction of EVB occurrence was significantly higher for the MUI[0.858(95%CI:0.774-0.920)]than forΔMELD[0.734(95%CI:0.636-0.817);P<0.05],LGVV[0.679(95%CI:0.578-0.769);P<0.05]or LGVBFD[0.726(95%CI:0.627-0.810);P<0.05]alone.When the MUI was set at 46,the index had high diagnostic accuracy(85.8%),with high specificity(80%)and sensitivity(87.27%).CONCLUSION:The MUI,a noninvasive and affordable index,can predict EVB occurrence in decompensated cirrhotic patients and serve as an alternative when conventional endoscopic screening is declined. | Xiao-Dan Xu Jian-Jun Dai Jian-Qing Qian Xun Pin Wei-Jun Wang | 2014 | World Journal of Gastroenterology2014，20，22： | 11 |
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