Manadas Creek is an urban tributary of the Rio Grande that flows past a decommissioned antimony smelter and processing plant. This antimony plant is associated with heavy metal contamination in the creek and still pos...Manadas Creek is an urban tributary of the Rio Grande that flows past a decommissioned antimony smelter and processing plant. This antimony plant is associated with heavy metal contamination in the creek and still poses a threat to the surrounding aquatic environment. Corbicula fluminea was used to determine bioaccumulation from the water column and sediments in Manadas Creek. The metals arsenic (As), antimony (Sb) and thallium (Tl) were analyzed in the water, sediments, gills, mantle, foot, digestive (DI) tract, gonads and shell of clams being monitored at eight sites between March and August 2013. Sediment, water, and dissected Corbicula fluminea samples from different sites in the Creek were acid-digested and analyzed by Inductively Coupled Plasma Optical Emission Spectroscopy. High levels of antimony (25.88 ug/L;75.96 mg/kg) and arsenic (8.26 ug/L;6.41 mg/kg) in the water and sediments were observed at the site downstream from the smelter. There were no detectable concentrations of arsenic, antimony, or thallium in the shell of C. fluminea. Arsenic and antimony were detected in the tissues of C. fluminea but thallium was not detected. Based on the results, the organotropism for arsenic is DI tract > gills > gonads > foot > mantle > shell and the organotropism for antimony is gills > DI tract > gonads > mantle > foot > shell. This study shows that the Asiatic clam (Corbicula fluminea) is a useful bio-monitor to provide data on the status of metal pollution in Manadas Creek, Laredo, Texas.展开更多
研究“根据DECAF评分筛选适合家庭治疗的慢性阻塞性肺疾病加重期患者:一项非劣性、随机对照研究和经济学评价”(Home treatment of COPD exacerbation selected by DECAF score:a non-inferiority,randomised controlled trial and econ...研究“根据DECAF评分筛选适合家庭治疗的慢性阻塞性肺疾病加重期患者:一项非劣性、随机对照研究和经济学评价”(Home treatment of COPD exacerbation selected by DECAF score:a non-inferiority,randomised controlled trial and economic evaluation).作者Echevarria C,Gray J,Hartley T,Miller J,Simpson AJ,Gibson GJ,Bourke SC.发表于Thorax 2018;73:713-722。该项目资金来自英国国家健康研究所——患者福利研究计划(National Institute for Health Research-Research for Patient Benefit Programme)(项目编号PB-PG-0213-30105)。NIHR signal全文阅读,请登陆网址:https://discover,dc.nihr.ac.uk/content/signal-000691/hospital-at-home-treatment-for-copd-flare-ups.(编者注:NIHR,全称National Institute for Health Research,是英国一个旨在通过科学研究来提高国家的卫生健康的机构,详见网站<https://www.nihr.ac.uk/).展开更多
文摘Manadas Creek is an urban tributary of the Rio Grande that flows past a decommissioned antimony smelter and processing plant. This antimony plant is associated with heavy metal contamination in the creek and still poses a threat to the surrounding aquatic environment. Corbicula fluminea was used to determine bioaccumulation from the water column and sediments in Manadas Creek. The metals arsenic (As), antimony (Sb) and thallium (Tl) were analyzed in the water, sediments, gills, mantle, foot, digestive (DI) tract, gonads and shell of clams being monitored at eight sites between March and August 2013. Sediment, water, and dissected Corbicula fluminea samples from different sites in the Creek were acid-digested and analyzed by Inductively Coupled Plasma Optical Emission Spectroscopy. High levels of antimony (25.88 ug/L;75.96 mg/kg) and arsenic (8.26 ug/L;6.41 mg/kg) in the water and sediments were observed at the site downstream from the smelter. There were no detectable concentrations of arsenic, antimony, or thallium in the shell of C. fluminea. Arsenic and antimony were detected in the tissues of C. fluminea but thallium was not detected. Based on the results, the organotropism for arsenic is DI tract > gills > gonads > foot > mantle > shell and the organotropism for antimony is gills > DI tract > gonads > mantle > foot > shell. This study shows that the Asiatic clam (Corbicula fluminea) is a useful bio-monitor to provide data on the status of metal pollution in Manadas Creek, Laredo, Texas.
文摘研究“根据DECAF评分筛选适合家庭治疗的慢性阻塞性肺疾病加重期患者:一项非劣性、随机对照研究和经济学评价”(Home treatment of COPD exacerbation selected by DECAF score:a non-inferiority,randomised controlled trial and economic evaluation).作者Echevarria C,Gray J,Hartley T,Miller J,Simpson AJ,Gibson GJ,Bourke SC.发表于Thorax 2018;73:713-722。该项目资金来自英国国家健康研究所——患者福利研究计划(National Institute for Health Research-Research for Patient Benefit Programme)(项目编号PB-PG-0213-30105)。NIHR signal全文阅读,请登陆网址:https://discover,dc.nihr.ac.uk/content/signal-000691/hospital-at-home-treatment-for-copd-flare-ups.(编者注:NIHR,全称National Institute for Health Research,是英国一个旨在通过科学研究来提高国家的卫生健康的机构,详见网站<https://www.nihr.ac.uk/).
