70 research outputs found
Dual-function cellulose composites for fluorescence detection and removal of fluoride
A biodegradable and robust fluorogenic cellulose material for simultaneous fluoride recognition and adsorption at environmentally significant levels is presented. The fluorescent modified cellulose (FMC) containing a boronic acid-based anthracene group as a fluorescent signaling unit displays a selective fluorescence enhancement with Fâ. On the other hand, Clâ, Brâ, SO42â, H2PO4âand ClO4â did not induce significant changes in fluorescence. Furthermore, FMC shows excellent Fâ adsorption over a wide range of pH with a low dosage. Equilibrium studies demonstrate that the adsorption of Fâ follows the Langmuir model in an aqueous solution. While, adsorption kinetics were found to follow the pseudo-second-order model. The simplicity of the method and the ability to detect and remove fluoride in waste water is noteworthy given the problems associated with fluoride pollution in drinking water.</p
Effects of air pollution on neonatal prematurity in guangzhou of china: a time-series study
<p>Abstract</p> <p>Background</p> <p>Over the last decade, a few studies have investigated the possible adverse effects of ambient air pollution on preterm birth. However, the correlation between them still remains unclear, due to insufficient evidences.</p> <p>Methods</p> <p>The correlation between air pollution and preterm birth in Guangzhou city was examined by using the Generalized Additive Model (GAM) extended Poisson regression model in which we controlled the confounding factors such as meteorological factors, time trends, weather and day of the week (DOW). We also adjusted the co linearity of air pollutants by using Principal Component Analysis. The meteorological data and air pollution data were obtained from the Meteorological Bureau and the Environmental Monitoring Centre, while the medical records of newborns were collected from the perinatal health database of all obstetric institutions in Guangzhou, China in 2007.</p> <p>Results</p> <p>In 2007, the average daily concentrations of NO<sub>2</sub>, PM<sub>10 </sub>and SO<sub>2 </sub>in Guangzhou, were 61.04, 82.51 and 51.67 Îźg/m<sup>3 </sup>respectively, where each day an average of 21.47 preterm babies were delivered. Pearson correlation analysis suggested a negative correlation between the concentrations of NO<sub>2</sub>, PM<sub>10</sub>, SO<sub>2, </sub>and temperature as well as relative humidity. As for the time-series GAM analysis, the results of single air pollutant model suggested that the cumulative effects of NO<sub>2</sub>, PM<sub>10 </sub>and SO<sub>2 </sub>reached its peak on day 3, day 4 and day 3 respectively. An increase of 100 Îźg/m<sup>3 </sup>of air pollutants corresponded to relative risks (RRs) of 1.0542 (95%CI: 1.0080 ~1.1003), 1.0688 (95%CI: 1.0074 ~1.1301) and 1.1298 (95%CI: 1.0480 ~1.2116) respectively. After adjusting co linearity by using the Principal Component Analysis, the GAM model of the three air pollutants suggested that an increase of 100 Îźg/m<sup>3 </sup>of air pollutants corresponded to RRs of 1.0185 (95%CI: 1.0056~1.0313), 1.0215 (95%CI: 1.0066 ~1.0365) and 1.0326 (95%CI: 1.0101 ~1.0552) on day 0; and RRs of the three air pollutants, at their strongest cumulative effects, were 1.0219 (95%CI: 1.0053~1.0386), 1.0274 (95%CI: 1.0066~1.0482) and 1.0388 (95%CI: 1.0096 ~1.0681) respectively.</p> <p>Conclusions</p> <p>This study indicates that the daily concentrations of air pollutants such as NO<sub>2</sub>, PM<sub>10 </sub>and SO<sub>2 </sub>have a positive correlation with the preterm births in Guangzhou, China.</p
Spatial heterogeneous response of land use and landscape functions to ecological restoration: the case of the Chinese loess hilly region
Comparison of taurine, GABA, Glu, and Asp as scavengers of malondialdehyde in vitro and in vivo
Oscillatory motion in layered materials: graphene, boron nitride, and molybdenum disulfide
Investigation of the role of oxygen vacancies on polarization fatigue in ferroelectric thin films
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