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https://www.readbyqxmd.com/read/29793196/seasonal-cycles-of-secondary-organic-aerosol-tracers-in-rural-guangzhou-southern-china-the-importance-of-atmospheric-oxidants
#1
Qi Yuan, Senchao Lai, Junwei Song, Xiang Ding, Lishan Zheng, Xinming Wang, Yan Zhao, Junyu Zheng, Dingli Yue, Liuju Zhong, Xiaojun Niu, Yingyi Zhang
Thirteen secondary organic aerosol (SOA) tracers of isoprene (SOAI ), monoterpenes (SOAM ), sesquiterpenes (SOAS ) and aromatics (SOAA ) in fine particulate matter (PM2.5 ) were measured at a Pearl River Delta (PRD) regional site for one year. The characteristics including their seasonal cycles and the factors influencing their formation in this region were studied. The seasonal patterns of SOAI , SOAM and SOAS tracers were characterized over three enhancement periods in summer (I), autumn (II) and winter (III), while the elevations of SOAA tracer (i...
May 21, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29793029/oxidative-degradation-of-atenolol-by-heat-activated-persulfate-kinetics-degradation-pathways-and-distribution-of-transformation-intermediates
#2
Dong Miao, Jianbiao Peng, Xiaohuan Zhou, Li Qian, Mengjie Wang, Li Zhai, Shixiang Gao
Atenolol (ATL) has been widely detected in wastewater and aquatic environment. Although satisfactory removal of ATL from wastewater could be achieved, the mineralization ratio is usually low, which may result in the accumulation of its transformation products in the effluent and cause additional ecological risk to the environment. The aim of this study is to explore the effectiveness of heat activated persulfate (PS) in the removal of ATL from wastewater. Influencing factors including temperature, PS dosage, solution pH, existence of NO3 - , Cl- , HCO3 - and Suwannee river fulvic acid (SRFA) were examined...
May 17, 2018: Chemosphere
https://www.readbyqxmd.com/read/29793028/cytosolic-distributions-of-highly-toxic-metals-cd-and-tl-and-several-essential-elements-in-the-liver-of-brown-trout-salmo-trutta-l-analyzed-by-size-exclusion-chromatography-and-inductively-coupled-plasma-mass-spectrometry
#3
Zrinka Dragun, Nesrete Krasnići, Nicol Kolar, Vlatka Filipović Marijić, Dušica Ivanković, Marijana Erk
Cytosolic distributions of nonessential metals Cd and Tl and seven essential elements among compounds of different molecular masses were studied in the liver of brown trout (Salmo trutta) from the karstic Krka River in Croatia. Analyses were done by size exclusion high performance liquid chromatography and high resolution inductively coupled plasma mass spectrometry. Common feature of Cd and Tl, as highly toxic elements, was their distribution within only two narrow peaks. The increase of cytosolic Cd concentrations was reflected in marked increase of Cd elution within low molecular mass peak (maximum at ∼15 kDa), presumably containing metallothioneins (MTs), which indicated successful Cd detoxification in brown trout liver under studied exposure conditions...
May 15, 2018: Chemosphere
https://www.readbyqxmd.com/read/29793024/sedimentary-record-of-plutonium-in-the-north-yellow-sea-and-the-response-to-catchment-environmental-changes-of-inflow-rivers
#4
Yihong Xu, Shaoming Pan, Jianhua Gao, Xiaolin Hou, Yongfu Ma, Yongpei Hao
Plutonium (Pu) isotopes were first determined in surface and core sediment samples collected from the northern North Yellow Sea (NYS) to elucidate their source terms and deposition process as well as the response to catchment environmental changes of inflow rivers. 240 Pu/239 Pu atom ratios in all sediments showed the typical global fallout value of ∼0.18 without any influences from the nuclear weapons tests conducted recently in the North Korea or early in the Pacific Proving Ground. The large variation of 239+240 Pu activities (0...
May 18, 2018: Chemosphere
https://www.readbyqxmd.com/read/29792590/altererythrobacter-flavus-sp-nov-isolated-from-mangrove-sediment
#5
Hui Ma, Hao Ren, Lingfeng Huang, Yuanrong Luo
A Gram-negative, aerobic, non-motile, rod-shaped bacterium, designated MS1-4T , was isolated from mangrove sediment of the Jiulong River Estuary, Fujian Province, China. The isolate formed yellow colonies on ZB 2216E agar. Optimal growth was observed at pH 6.0, at 34 °C and in the presence of 4 % (w/v) NaCl. Strain MS1-4T shared highest 16S rRNA gene sequence similarity of 97.7 % with Altererythrobacter mangrovi C9-11T , followed by Altererythrobacter ishigakiensis JPCCMB0017T (97.2 %). Phylogenetic analysis indicated that strain MS1-4T formed a clade with A...
May 24, 2018: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/29791885/multi-barrier-approach-for-removing-organic-micropollutants-using-mobile-water-treatment-systems
#6
Youngbeom Yu, Yang Hun Choi, Jaewon Choi, Soohoon Choi, Sung Kyu Maeng
The diversity of organic micropollutants (OMPs) in aquatic environments has been increasing rapidly during the last decade. Therefore, it is important to monitor and attenuate emerging contaminants before they can negatively affect the aquatic environment. However, due to the diversity and complexity of OMPs, there are limitations to using a single method for treating a combination of these pollutants. To address this issue, a mobile water treatment system (MWTS) equipped with different treatment units was designed to remove OMPs under field conditions...
May 20, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29791882/simulation-based-assessment-of-the-impact-of-fertiliser-and-herbicide-application-on-freshwater-ecosystems-at-the-three-gorges-reservoir-in-china
#7
Björn Scholz-Starke, Li Bo, Andreas Holbach, Stefan Norra, Tilman Floehr, Henner Hollert, Martina Roß-Nickoll, Andreas Schäffer, Richard Ottermanns
Dams have profound impacts on river ecosystems, amongst them inundation of land, altered dynamics of the water body or uprising reservoir backwaters influencing tributary or upstream river sections. Along the outstandingly ecologically important Yangtze River in China, the Three Gorges Reservoir (TGR) is the largest project, covering an area of 1080 km2 . From the beginning, the dam-project came in for criticism on increasing environmental risks due to sub-merging former industrial and urban areas. We simulated dynamics of biotic and abiotic components of the TGR ecosystem (trophic guilds of aquatic organisms, hydrodynamics, nutrients), as well as the behaviour of the herbicidal substance propanil and its metabolites 3,4-Dichloroaniline (DCA) and 3,3',4,4'-tetrachloroazoxybenzene (TCAB)...
May 20, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29791446/nitrogen-limitation-toxin-synthesis-potential-and-toxicity-of-cyanobacterial-populations-in-lake-okeechobee-and-the-st-lucie-river-estuary-florida-during-the-2016-state-of-emergency-event
#8
Benjamin J Kramer, Timothy W Davis, Kevin A Meyer, Barry H Rosen, Jennifer A Goleski, Gregory J Dick, Genesok Oh, Christopher J Gobler
Lake Okeechobee, FL, USA, has been subjected to intensifying cyanobacterial blooms that can spread to the adjacent St. Lucie River and Estuary via natural and anthropogenically-induced flooding events. In July 2016, a large, toxic cyanobacterial bloom occurred in Lake Okeechobee and throughout the St. Lucie River and Estuary, leading Florida to declare a state of emergency. This study reports on measurements and nutrient amendment experiments performed in this freshwater-estuarine ecosystem (salinity 0-25 PSU) during and after the bloom...
2018: PloS One
https://www.readbyqxmd.com/read/29791292/sepsis-caused-by-streptococcus-suis-serotype-2-in-a-eurasian-river-otter-lutra-lutra-in-the-republic-of-korea
#9
Yeonsu Oh, Dongseob Tark, Sung-Hyun Moon, Jae-Ik Han, Won-Il Kim, Ho-Seong Cho
An adult male Eurasian river otter ( Lutra lutra) was diagnosed with systemic infection. Microbiologic findings identified Streptococcus suis serotype 2, clonal complex 28, and sequence type 629. Genetic analysis strongly suggested the transmission of S. suis isolate from pigs to wild animals through environmental contamination.
May 23, 2018: Journal of Wildlife Diseases
https://www.readbyqxmd.com/read/29790233/factors-regulating-carbon-sinks-in-mangrove-ecosystems
#10
Shi-Bo Li, Po-Hung Chen, Jih-Sheng Huang, Mei-Li Hsueh, Li-Yung Hsieh, Chen-Lu Lee, Hsing-Juh Lin
Mangroves are recognized as one of the richest carbon storage systems. However, the factors regulating carbon sinks in mangrove ecosystems are still unclear, particularly in the subtropical mangroves. The biomass, production, litterfall, detrital export and decomposition of the dominant mangrove vegetation in subtropical (Kandelia obovata) and tropical (Avicennia marina) Taiwan were quantified from October 2011 to July 2014 to construct the carbon budgets. Despite the different tree species, a principal component analysis revealed the site or environmental conditions had a greater influence than the tree species on the carbon processes...
May 23, 2018: Global Change Biology
https://www.readbyqxmd.com/read/29789592/allogenic-and-autogenic-signals-in-the-stratigraphic-record-of-the-deep-sea-bengal-fan
#11
Mike Blum, Kimberly Rogers, James Gleason, Yani Najman, Jarrett Cruz, Lyndsey Fox
The Himalayan-sourced Ganges-Brahmaputra river system and the deep-sea Bengal Fan represent Earth's largest sediment-dispersal system. Here we present detrital zircon U-Pb provenance data from Miocene to middle Pleistocene Bengal Fan turbidites, and evaluate the influence of allogenic forcing vs. autogenic processes on signal propagation from the Himalaya to the deep sea. Our data record the strong tectonic and climatic forcing characteristic of the Himalayan system: after up to 2500 km of river transport, and >1400 km of transport by turbidity currents, the U-Pb record faithfully represents Himalayan sources...
May 22, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29789462/identifying-the-driving-factors-of-water-quality-in-a-sub-watershed-of-the-republican-river-basin-kansas-usa
#12
Morgen W V Burke, Mojtaba Shahabi, Yeqian Xu, Haochi Zheng, Xiaodong Zhang, Jeffrey VanLooy
Studies have shown that the agricultural expansion and land use changes in the Midwest of the U.S. are major drivers for increased nonpoint source pollution throughout the regional river systems. In this study, we empirically examined the relationship of planted area and production of three dominant crops with nitrate flux in the Republican River, Kansas, a sub-watershed of Mississippi River Basin. Our results show that land use in the region could not explain the observed changes in nitrate flux in the river...
May 22, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29787910/temporal-trends-and-transport-of-perfluoroalkyl-substances-pfass-in-a-subtropical-estuary-jiulong-river-estuary-fujian-china
#13
Yizhi Cai, Xinhong Wang, Yuling Wu, Songhe Zhao, Yongyu Li, Liya Ma, Can Chen, Jun Huang, Gang Yu
The seasonal variations and spatial distributions of fifteen perfluoroalkyl substances (PFASs) were investigated in the water of the subtropical Jiulong River Estuary (JRE) in Fujian, China. The concentrations and composition profiles of PFASs showed significant seasonal variations. ∑PFASs concentrations ranged from 4.8 to 37.6 ng L-1 , 12.2 to 110 ng L-1 and 3.3 to 43.0 ng L-1 in the dry, medium and wet seasons, respectively. Perfluorooctane sulfonate (PFOS) was found to be the most abundant PFAS in the dry season, with a composition of 33% ± 5%, Perfluorohexanoic acid PFHxA (47% ± 13%) and perfluoropentanoic acid (PFPeA) (52% ± 15%) were the dominant compounds in the medium and wet seasons, respectively...
May 19, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29787907/response-of-net-primary-production-to-land-use-and-land-cover-change-in-mainland-china-since-the-late-1980s
#14
Jun Li, Zhaoli Wang, Chengguang Lai, Xiaoqing Wu, Zhaoyang Zeng, Xiaohong Chen, Yanqing Lian
Land use and land cover patterns in mainland China have substantially changed in the recent decades under the economic reform policies of the government. The terrestrial carbon cycle, particularly the net primary productivity (NPP), has been substantially changed on both local and national scales. With the growing concern over the effects of the terrestrial carbon cycle on global climate changes, the impacts of land use and cover change (LUCC) on NPP need to be understood. In this study, variations in NPP caused by LUCC (e...
May 19, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29787906/the-use-of-combined-treatments-for-reducing-parabens-in-surface-waters-ion-exchange-resin-and-nanofiltration
#15
Carmen M López-Ortiz, Irene Sentana-Gadea, Pedro Varó-Galvañ, Salvador E Maestre-Pérez, Daniel Prats-Rico
In this study, the removal of parabens from waters, using a combined treatment of magnetic ion exchange resins and subsequent filtration through nanofiltration membranes, was investigated. The selected parabens were methylparaben, ethylparaben, propylparaben and butylparaben. Two different magnetic anionic exchanger resins, MIEX® DOC and MIEX® GOLD, and two nanofiltration membranes (NF), NF-90 and DESAL-HL, were tested. The study was carried out using mono and multicomponent systems, using deionized water and natural waters sampled from two different rivers...
May 19, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29787903/flood-risk-d-evolution-disentangling-key-drivers-of-flood-risk-change-with-a-retro-model-experiment
#16
Andreas Paul Zischg, Patrick Hofer, Markus Mosimann, Veronika Röthlisberger, Jorge A Ramirez, Margreth Keiler, Rolf Weingartner
Flood risks are dynamically changing over time. Over decades and centuries, the main drivers for flood risk change are influenced either by perturbations or slow alterations in the natural environment or, more importantly, by socio-economic development and human interventions. However, changes in the natural and human environment are intertwined. Thus, the analysis of the main drivers for flood risk changes requires a disentangling of the individual risk components. Here, we present a method for isolating the individual effects of selected drivers of change and selected flood risk management options based on a model experiment...
May 19, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29787742/hidden-sites-in-the-distribution-of-the-crayfish-plague-pathogen-aphanomyces-astaci-in-eastern-europe-relicts-of-genetic-groups-from-older-outbreaks
#17
Jörn Panteleit, Nina Sophie Keller, Javier Diéguez-Uribeondo, Jenny Makkonen, Laura Martín-Torrijos, Viorica Patrulea, Mălina Pîrvu, Cristina Preda, Anne Schrimpf, Lucian Pârvulescu
The crayfish plague agent Aphanomyces astaci is one of the world's most threatening invasive species. Originally from North America, the pathogen is being imported alongside American crayfish species, which are used for various purposes. In this study, we investigated the marginal, currently known distribution area of the pathogen in Eastern Europe by sampling narrow-clawed crayfish (Astacus leptodactylus) and spiny-cheek crayfish (Orconectes limosus) populations. In addition, using specific real-time PCR, we tested several marine decapod species, which also occur in brackish waters of the Danube at the West coast of the Black Sea and the Dniester River basin...
May 19, 2018: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/29787605/correction-evaluating-signals-of-oil-spill-impacts-climate-and-species-interactions-in-pacific-herring-and-pacific-salmon-populations-in-prince-william-sound-and-copper-river-alaska
#18
Eric J Ward, Milo Adkison, Jessica Couture, Sherri C Dressel, Michael A Litzow, Steve Moffitt, Tammy Hoem Neher, John Trochta, Rich Brenner
[This corrects the article DOI: 10.1371/journal.pone.0172898.].
2018: PloS One
https://www.readbyqxmd.com/read/29787431/rapid-response-dose-assessment-and-clinical-management-of-a-plutonium-contaminated-puncture-wound
#19
Stephen L Sugarman, William M Findley, Richard E Toohey, Nicholas Dainiak
Internalization of radionuclides occurs not only by inhalation, ingestion, parenteral injection (i.e., administration of radioactive material for a medical purpose), and direct transdermal absorption, but also by contaminated wounds. In June 2010, a glove-box operator at the U.S. Department of Energy's Savannah River Site sustained a puncture wound while venting canisters containing legacy materials contaminated with Pu. To indicate the canisters had been vented, a flag was inserted into the vent hole. The shaft of the flag penetrated the protective gloves worn by the operator...
July 2018: Health Physics
https://www.readbyqxmd.com/read/29787295/alertness-and-psychomotor-performance-levels-of-marine-pilots-on-an-irregular-work-roster
#20
Philippe Boudreau, Sylvain Lafrance, Diane B Boivin
Fatigue is recognized as an important safety concern in the transportation industry. In this study, our goal was to investigate how circadian and sleep-wake dependent factors influence St-Lawrence River pilots' sleep-wake cycle, alertness and psychomotor performance levels at work. A total of 18 male St-Lawrence River ship pilots were recruited to a 16-21-day field study. Pilots' chronotype, sleepiness and insomnia levels were documented using standardized questionnaires. Their sleep-wake cycle was documented by a sleep-wake log and wrist-worn activity monitoring...
May 22, 2018: Chronobiology International
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