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https://www.readbyqxmd.com/read/28646765/historical-record-of-polychlorinated-biphenyls-pcbs-and-special-occurrence-of-pcb-209-in-a-shallow-fresh-water-lake-from-eastern-china
#1
Shouliang Huo, Chaocan Li, Beidou Xi, Zhiqiang Yu, Kevin M Yeager, Fengchang Wu
Concentrations of polychlorinated biphenyls (PCBs) were measured in dated sediment cores collected from the fifth largest freshwater lake in China, Lake Chaohu, to investigate PCB temporal trends, accumulation, and environmental fate. Total PCB concentrations in Lake Choahu sediments ranged from 0.03 to 24.11 ng g(-1) (d.w.). PCB 209 was the dominant congener, accounting for 45.5%-83.9% of total PCBs detected after the mid-20th century. All PCB congeners were positively correlated with total organic carbon (TOC) concentrations...
June 18, 2017: Chemosphere
https://www.readbyqxmd.com/read/28638964/ships-ballast-water-treatment-by-chlorination-can-generate-toxic-trihalomethanes
#2
Marco R Hernandez, Nargis Ismail, Ken G Drouillard, Hugh J MacIsaac
The International Maritime Organization (IMO) will enforce a new abundance-based performance standard for ballast water in September, 2017. Strong oxidants, like chlorine, have been proposed as a method for achieving this standard. However chlorine treatment of ballast water can produce hazardous trihalomethanes. We assessed maximum trihalomethane production from one chlorine dose for three types of ballast water (fresh, brackish and marine) and three levels of total organic carbon (TOC) concentration (natural, filtered, enhanced)...
June 21, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28633834/preparation-of-a-novel-sonocatalyst-au-niga2o4-au-bi2o3-nanocomposite-and-application-in-sonocatalytic-degradation-of-organic-pollutants
#3
Guowei Wang, Yingying Huang, Guanshu Li, Hongbo Zhang, Yidi Wang, Bowen Li, Jun Wang, Youtao Song
A novel nanocomposite, Au/NiGa2O4-Au-Bi2O3, as an effective sonocatalyst was prepared through hydrothermal process and high-temperature calcination methods, and then characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). The sonocatalytic activity of Au/NiGa2O4-Au-Bi2O3 nanocomposite was detected through the degradation of some organic pollutants under ultrasonic irradiation. Furthermore, the influences of mass ratio of NiGa2O4 and Bi2O3, ultrasonic irradiation time and used times on the sonocatalytic degradation efficiency were investigated by using Total Organic Carbon (TOC) and UV-vis spectroscopy...
September 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28632482/staff-associate-specialist-and-specialty-doctors-national-audit-on-the-management-of-gonorrhoea-in-the-united-kingdom-2015
#4
Helen Mullan, Jane Richards, John Lee
The British Association for Sexual Health and HIV (BASHH) revised United Kingdom national guideline for the management of gonorrhoea in adults, 2011, identified five auditable outcome measures, namely, that all patients should receive first-line treatment, be screened or treated for chlamydial infection, have a test of cure (TOC), be offered written information and have partner notification carried out. The UK National Guideline for Gonorrhoea Testing, Clinical Effectiveness Group, BASHH, 2012, recommended in addition that all reactive nucleic acid amplification tests (NAATs) from pharynx and rectum should be confirmed by supplementary testing, using a second NAAT which detects a different nucleic acid target, all those with a positive NAAT for gonorrhoea should have culture and antimicrobial susceptibility testing and that TOC should be done by two weeks...
January 1, 2017: International Journal of STD & AIDS
https://www.readbyqxmd.com/read/28631162/core-curriculum-case-illustration-blunt-traumatic-thoracic-aortic-pseudo-aneurysm
#5
Muhammad Mubashir Ramzan, Shaimaa Abdelhassib Fadl, Jeffrey D Robinson
Core Curriculum Illustration: [blunt thoracic aortic pseudo aneurysm]. This is the [40th] installment of a series that will highlight one case per publication issue from the bank of cases available online as part of the American Society of Emergency Radiology (ASER) educational resources. Our goal is to generate more interest in and use of our online materials. To view more cases online, please visit the ASER Core Curriculum and Recommendations for Study online at: http://www.aseronline.org/curriculum/toc.html...
June 19, 2017: Emergency Radiology
https://www.readbyqxmd.com/read/28630294/mercury-evidence-for-pulsed-volcanism-during-the-end-triassic-mass-extinction
#6
Lawrence M E Percival, Micha Ruhl, Stephen P Hesselbo, Hugh C Jenkyns, Tamsin A Mather, Jessica H Whiteside
The Central Atlantic Magmatic Province (CAMP) has long been proposed as having a causal relationship with the end-Triassic extinction event (∼201.5 Ma). In North America and northern Africa, CAMP is preserved as multiple basaltic units interbedded with uppermost Triassic to lowermost Jurassic sediments. However, it has been unclear whether this apparent pulsing was a local feature, or if pulses in the intensity of CAMP volcanism characterized the emplacement of the province as a whole. Here, six geographically widespread Triassic-Jurassic records, representing varied paleoenvironments, are analyzed for mercury (Hg) concentrations and Hg/total organic carbon (Hg/TOC) ratios...
June 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28629811/tbt-and-its-metabolites-in-sediments-survey-at-a-german-coastal-site-and-the-central-baltic-sea
#7
Marion Abraham, Lina Westphal, Ines Hand, Astrid Lerz, Jenny Jeschek, Dennis Bunke, Thomas Leipe, Detlef Schulz-Bull
Since the 1950s the organotin compound tributyltin (TBT) was intensively used in antifouling paints for marine vessels and it became of concern for the marine environment. Herein, we report on a study from 2015 on TBT and its metabolites monobutyltin (MBT) and dibutyltin (DBT) in sediments from the central Baltic Sea and a Baltic Sea coastal site with strong harbor activities (Warnemünde). Sublayers from a sediment core from the Arkona Basin were analyzed to investigate the long term organotin pressure for the Baltic Sea...
June 16, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28629696/new-criteria-to-determine-the-destabilization-of-the-acidogenic-anaerobic-co-digestion-of-organic-fraction-of-municipal-solid-waste-ofmsw-with-mixed-sludge-ms
#8
R Angeriz-Campoy, L A Fdez-Güelfo, Vinay Kumar Tyagi, C J Álvarez-Gallego, L I Romero-García
Effect of hydraulic retention time (HRT) on bio-hydrogen production from co-digestion of organic fraction of municipal solid waste (OFMSW) and mixed sludge (MS) in dry thermophilic conditions (55°C and 20% total solids) was investigated. A decreasing sequence of six HRTs, from 2.9 to 0.8-days, was performed to evaluate the stability of the system and the influence of HRT on the organic matter solubilization, the daily hydrogen production (HP) and the specific hydrogen production (SHP). Best results were obtained operating at 1...
June 12, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28628869/integrated-electrocoagulation-electrooxidation-process-for-the-treatment-of-soluble-coffee-effluent-optimization-of-cod-degradation-and-operation-time-analysis
#9
Harold N Ibarra-Taquez, Edison GilPavas, Ernest R Blatchley, Miguel-Ángel Gómez-García, Izabela Dobrosz-Gómez
Soluble coffee production generates wastewater containing complex mixtures of organic macromolecules. In this work, a sequential Electrocoagulation-Electrooxidation (EC-EO) process, using aluminum and graphite electrodes, was proposed as an alternative way for the treatment of soluble coffee effluent. Process operational parameters were optimized, achieving total decolorization, as well as 74% and 63.5% of COD and TOC removal, respectively. The integrated EC-EO process yielded a highly oxidized (AOS = 1.629) and biocompatible (BOD5/COD ≈ 0...
June 16, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28624732/comparison-of-different-treatment-methods-for-protein-solubilisation-from-waste-activated-sludge
#10
Keke Xiao, Yun Chen, Xie Jiang, Wan Yi Seow, Chao He, Yao Yin, Yan Zhou
Biomaterials recovery from wasted activated sludge has become an increasing interesting research topic. The purpose of this study was to systemically evaluate different sludge disintegration methods (ultrasonic, alkaline, and thermal treatments) for protein solubilisation from waste activated sludge (WAS). Compared to control without treatment, the soluble protein concentration increased by 11, 23 and 12 times under the optimal treatment conditions (ultrasonic treatment of 1 W mL(-1), alkaline treatment of pH 12 and thermal treatment at 80 °C)...
June 10, 2017: Water Research
https://www.readbyqxmd.com/read/28624730/efficient-degradation-of-tetrabromobisphenol-a-by-synergistic-integration-of-fe-ni-bimetallic-catalysis-and-microbial-acclimation
#11
Xingxing Peng, Zhangna Wang, Jingfei Huang, Barry R Pittendrigh, Shengwei Liu, Xiaoshan Jia, Po Keung Wong
This study provides a novel technology for the degradation of tetrabromobisphenol A (TBBPA) via an interaction of Fe redox and a shift of functional microbial community. TBBPA was degraded by integration of synthesized Fe-Ni bimetallic particles and enriched microbial consortium within an aqueous system. This cooperative integration yielded the best TBBPA-degrading capacity (100% removal after treatment for 2 h) and highest TOC-removing efficiency (94.5% removal after treatment for 96 h), as well as the lowest toxicity to Vibrio fischeri (almost 0% growth inhibition during reaction)...
June 9, 2017: Water Research
https://www.readbyqxmd.com/read/28621057/prospective-evaluation-of-toceranib-phosphate-in-metastatic-canine-osteosarcoma
#12
T Laver, C A London, D M Vail, B J Biller, J Coy, D H Thamm
Efficacious therapies for measurable metastatic canine osteosarcoma (OSA) are generally lacking. Preliminary retrospective studies suggested that approximately 50% of dogs with measurable metastatic OSA experienced clinical benefit (objective response or clinically meaningful disease stabilisation) following toceranib (TOC) treatment. The purpose of this clinical trial was to prospectively evaluate the clinical outcome following TOC treatment in dogs with measurable pulmonary metastatic OSA. A secondary goal was to identify potential biomarkers of clinical benefit by measuring changes in plasma vascular endothelial growth factor (VEGF) and circulating regulatory T-cell (Treg) percentage...
June 15, 2017: Veterinary and Comparative Oncology
https://www.readbyqxmd.com/read/28618380/magnetite-fe-al-montmorillonite-as-a-fenton-catalyst-with-efficient-degradation-of-phenol
#13
Xipeng Wei, Honghai Wu, Feng Sun
A Fe-Al-MPM material assembled from nanosized magnetite and Fe-Al-pillared montmorillonite (Fe-Al-Mt) was characterized by XRD, XPS, BET, SEM and TEM. Fe-Al-Mt was proven to be capable of facilitating the dispersion of magnetite nanoparticles and inhibiting their aggregation. The coupling of Fe-Al-Mt with magnetite in Fe-Al-MPM improved its Fenton catalytic activity. Complete conversion of phenol within 80min with a high TOC removal rate (>78%) was achieved using Fe-Al-MPM as a heterogeneous Fenton catalyst under optimized conditions...
May 31, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28617984/issue-information-toc
#14
(no author information available yet)
No abstract text is available yet for this article.
June 2017: Biometrics
https://www.readbyqxmd.com/read/28616834/minimizing-bias-in-virally-seeded-water-treatment-studies-evaluation-of-optimal-bacteriophage-and-mammalian-virus-preparation-methodologies
#15
Nathan Dunkin, ShihChi Weng, Joseph G Jacangelo, Kellogg J Schwab
One key assumption impacting data quality in viral inactivation studies is that reduction estimates are not altered by the virus seeding process. However, seeding viruses often involves the inadvertent addition of co-constituents such as cell culture components or additives used during preparation steps which can impact viral reduction estimates by inducing non-representative oxidant demand in disinfection studies and fouling in membrane assessments. The objective of this study was therefore to characterize a mammalian norovirus surrogate, murine norovirus (MNV), and bacteriophage MS2 at sequential stages of viral purification and to quantify their potential contribution to artificial oxidant demand and non-representative membrane fouling...
June 14, 2017: Food and Environmental Virology
https://www.readbyqxmd.com/read/28616789/core-curriculum-illustration-colles-dorsally-angulated-fracture-of-the-distal-radius
#16
Jake W Sharp, Rachael M Edwards
This is the 41st installment of a series that will highlight one case per publication issue from the bank of cases available online as part of the American Society of Emergency Radiology (ASER) educational resources. Our goal is to generate more interest in and use of our online materials. To view more cases online, please visit the ASER Core Curriculum and Recommendations for Study online at: http://www.erad.org/page/CCIP_TOC .
June 14, 2017: Emergency Radiology
https://www.readbyqxmd.com/read/28616788/core-curriculum-case-illustration-cardiac-tamponade-complicating-proximal-aortic-dissection
#17
H Laura Aaltonen, Ken F Linnau, Shaimaa Abdelhassib Fadl
This is the 39th installment of a series that will highlight one case per publication issue from the bank of cases available online as part of the American Society of Emergency Radiology (ASER) educational resources. Our goal is to generate more interest in and use of our online materials. To view more cases online, please visit the ASER Core Curriculum and Recommendations for Study online at http://www.erad.org/page/CCIP_TOC .
June 14, 2017: Emergency Radiology
https://www.readbyqxmd.com/read/28614740/investigation-of-ozonation-kinetics-and-transformation-products-of-sucralose
#18
Ruikang Hu, Lifeng Zhang, Jiangyong Hu
Sucralose is one of widely used artificial sweeteners, which has been ubiquitously detected in various water sources, such as wastewater and randomly in reservoir water. It is also reported to be persistent to various water treatment techniques. Although there are some studies on removal of sucralose by advanced oxidation process, limited information, in terms of reaction kinetics, transformation products and degradation pathway etc., was reported in its ozonation process. In this study, the reaction kinetics, removal efficiency, influence of pH, humic acid and carbonate on sucralose degradation by ozone, have been studied systematically...
June 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28612479/open-water-and-under-ice-seasonal-variations-in-trace-element-content-and-physicochemical-associations-in-fluvial-bed-sediment
#19
Lorne E Doig, Meghan K Carr, Anna G N Meissner, Tim D Jardine, Paul D Jones, Lalita Bharadwaj, Karl-Erich Lindenschmidt
Across the circumpolar world, intensive anthropogenic activities in the southern reaches of many large, northward-flowing rivers can cause sediment contamination in the downstream depositional environment. The influence of ice cover on concentrations of inorganic contaminants in bed sediment (i.e., sediment quality) is unknown in these rivers where winter is the dominant season. A Geomorphic Response Unit (GRU) approach was used to select hydraulically-diverse sampling sites across a northern test-case system, the Slave River and Delta, NT, Canada...
June 13, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28604913/a-ferrocenecarboxylate-functionalized-titanium-oxo-cluster-the-ferrocene-wheel-as-a-sensitizer-for-photocurrent-response
#20
Yang Fan, Ying Cui, Guo-Dong Zou, Rui-Huan Duan, Xu Zhang, Yu-Xiang Dong, Hai-Ting Lv, Jun-Tao Cao, Qiang-Shan Jing
Sensitized titanium-oxo clusters (TOCs) have attracted growing interest. However, reports on TOCs incorporated with a metal complex as photosensitizers are still very rare. In the present work, the organometallic complex ferrocene was used as a sensitizer for a titanium-oxo cluster. A ferrocenecarboxylate-substituted titanium-oxo cluster [Ti6(μ3-O)6(OiPr)6(O2CFc)6] (Fc = ferrocenyl) was synthesized and structurally characterized, in which the ferrocene wheel performs as a sensitizer for photocurrent response...
June 12, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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