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https://www.readbyqxmd.com/read/29454268/occurrence-and-distribution-of-antibiotics-in-mariculture-farms-estuaries-and-the-coast-of-the-beibu-gulf-china-bioconcentration-and-diet-safety-of-seafood
#1
Ruiling Zhang, Jiying Pei, Ruijie Zhang, Shaopeng Wang, Weibin Zeng, Dali Huang, Yi Wang, Yuanyuan Zhang, Yinghui Wang, Kefu Yu
The occurrence, distribution, bioconcentration and diet safety via seafood consumption of 19 antibiotics were investigated in eight closed mariculture ponds, four estuaries, two nearshore areas and one offshore area from the Beibu Gulf. Seventeen, 16, 15 and 7 antibiotics were detected at total concentrations of 43.2 - 885 ng L -1 , 22.4 - 118 ng L -1 , 22.7 - 24.5 ng L -1 , and 1.81-3.23 ng L -1 in the water of the above different areas, respectively. This indicates that the mariculture ponds are important sources of antibiotic pollution on the coast of the Beibu Gulf...
February 14, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29454218/atmospheric-pattern-of-volatile-organochlorine-compounds-and-hexachlorobenzene-in-the-surroundings-of-a-chlor-alkali-plant
#2
Barend L van Drooge, Esther Marco, Joan O Grimalt
The outdoor atmospheric distributions of chlorinated volatile organic compounds (VOCs) from locations receiving the emissions of a chlor-alkali plant have been studied. Trichloroethylene and tetrachloroethylene (medians 2.4 μg/m 3 and 1.7 μg/m 3 , respectively) were the most abundant compounds, which was in accordance with the production processes from these installations. The concentrations of trichlorofluoromethane, median 1.6 μg/m 3 , are rather similar to the average levels described in general in the troposphere and cannot be attributed to this specific source...
February 14, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29454213/spatio-temporal-comparison-of-neustonic-microplastic-density-in-hong-kong-waters-under-the-influence-of-the-pearl-river-estuary
#3
Pui Kwan Cheung, Lincoln Fok, Pui Lam Hung, Lewis T O Cheung
Rivers are recognised as an important source of plastic debris in the open sea. The Pearl River in China is estimated to transport 0.1milliontonnes of plastic waste to the open sea annually. However, no empirical study has been conducted to assess the plastic contamination levels in the Pearl River Estuary. Hong Kong is situated in the east of the Pearl River Estuary; its western waters are strongly influenced by river discharge, whereas the eastern waters are unaffected by the freshwater plume. In this study, we quantified the neustonic plastic debris density in the western and eastern waters of Hong Kong...
February 14, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29454211/seasonality-water-use-and-community-management-of-water-systems-in-rural-settings-qualitative-evidence-from-ghana-kenya-and-zambia
#4
Emma Kelly, Katherine F Shields, Ryan Cronk, Kristen Lee, Nikki Behnke, Tori Klug, Jamie Bartram
The sustainability of rural, community-managed water systems in sub-Saharan Africa depends in part on the ability of local water committees to repair breakdowns and carry out the operation and maintenance (O&M) of the system. Much of sub-Saharan Africa has two distinct seasons that affect the availability of water sources and how people use water. Little is known about how seasonality affects water system management. This qualitative study is based on 320 interviews and focus group discussions and examines the effects of season on community water use and management in Ghana, Kenya and Zambia...
February 14, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29454201/nitrous-oxide-emissions-from-near-zero-water-exchange-brackish-recirculating-aquaculture-systems
#5
Uri Yogev, Adiel Atari, Amit Gross
The development of intensive recirculating aquaculture systems (RAS) with low water exchange has accelerated in recent years as a result of environmental, economic and other concerns. In these systems, fish are commonly grown at high density, 50 to 150kg/m 3 , using high-protein (30%-60%) feeds. Typically, the RAS consists of a solid treatment and a nitrification unit; in more advanced RAS, there is an additional denitrification step. Nitrous oxide (N 2 O), a byproduct during nitrification and denitrification processes, is a potent greenhouse gas that destroys the ozone layer...
February 14, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29454199/benthic-nitrite-exchanges-in-the-seine-river-france-an-early-diagenetic-modeling-analysis
#6
Zahra Akbarzadeh, Anniet M Laverman, Fereidoun Rezanezhad, Mélanie Raimonet, Eric Viollier, Babak Shafei, Philippe Van Cappellen
Nitrite is a toxic intermediate compound in the nitrogen (N) cycle. Elevated concentrations of nitrite have been observed in the Seine River, raising questions about its sources and fate. Here, we assess the role of bottom sediments as potential sources or sinks of nitrite along the river continuum. Sediment cores were collected from two depocenters, one located upstream, the other downstream, from the largest wastewater treatment plant (WWTP) servicing the conurbation of Paris. Pore water profiles of oxygen, nitrate, nitrite and ammonium were measured...
February 14, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29453513/simultaneous-cell-disruption-and-lipid-extraction-of-wet-aurantiochytrium-sp-krs101-using-a-high-shear-mixer
#7
Minsoo Kwak, Seul Gi Kang, Won-Kyung Hong, Jong-In Han, Yong Keun Chang
Microalgae are regarded as a promising source of biofuels, and the concept of a microalgae-based biorefinery has attracted increasing attention in recent years. From an economic perspective, however, the process remains far from competitive with fossil fuels. This is particularly true of lipid extraction, due in part to the energy-intensive drying step. As a result, wet extraction methods have been studied as an economic alternative. In the present study, a novel extraction approach which utilizes high shear stress mixing was adopted and demonstrated for simultaneous lipid extraction and cell disruption to enable the retrieval of lipids directly from concentrated wet biomass...
February 16, 2018: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/29453267/plant-microbe-and-abiotic-factors-influencing-salmonella-survival-and-growth-on-alfalfa-sprouts-and-swiss-chard-microgreens
#8
Elizabeth Reed, Christina M Ferreira, Rebecca Bell, Eric W Brown, Jie Zheng
Microgreens, like sprouts, are relatively fast growing, and generally consumed raw. Moreover, as observed in sprouts, microbial contamination from preharvest sources could also be present in the production of microgreens. In this study, two Salmonella enterica serovars (Hartford and Cubana) applied, at multiple inoculation levels, were evaluated for survival and growth on alfalfa sprouts and Swiss chard microgreens using the most probable number (MPN) method. Various abiotic factors were also examined for their effects on Salmonella survival and growth on sprouts and microgreens...
February 16, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29452565/serum-vitamin-c-levels-modulate-the-lifespan-and-endoplasmic-reticulum-stress-response-pathways-in-mice-synthesizing-a-nonfunctional-mutant-wrn-protein
#9
Lucie Aumailley, Marie Julie Dubois, Tracy A Brennan, Chantal Garand, Eric R Paquet, Robert J Pignolo, André Marette, Michel Lebel
Werner syndrome (WS) is a premature aging disorder caused by mutations in a RecQ-family DNA helicase (WRN). Mice lacking part of the helicase domain of the WRN ortholog exhibit several phenotypic features of WS. In this study, we generated a Wrn mutant line that, like humans, relies entirely on dietary sources of vitamin C (ascorbate) to survive, by crossing them to mice that lack the gulonolactone oxidase enzyme required for ascorbate synthesis. In the presence of 0.01% ascorbate (w/v) in drinking water, double-mutant mice exhibited a severe reduction in lifespan, small size, sterility, osteopenia, and metabolic profiles different from wild-type (WT) mice...
February 8, 2018: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/29452383/the-effectiveness-of-asian-bush-mosquito-aedes-japonicus-japonicus-control-actions-in-colonised-peri-urban-areas-in-the-netherlands
#10
A Ibañez-Justicia, S Teekema, W den Hartog, F Jacobs, M Dik, A Stroo
The Asian bush mosquito (Aedes japonicus japonicus (Theobald)) is an invasive mosquito species in Europe. In 2012, it was for the first time detected in the Netherlands, in the municipality of Lelystad. After further research, thousands of specimens were found in the surrounding peri-urban areas of the city. A targeted mosquito control campaign began in 2015 with the objective of reducing populations in locations with the highest concentrations of Ae. japonicus breeding sites: allotment garden complexes. Mosquito control consisted of source reduction combined with application of the larvicide Vectomax in breeding sites...
February 14, 2018: Journal of Medical Entomology
https://www.readbyqxmd.com/read/29452181/the-demosponge-pseudoceratina-purpurea-as-a-new-source-of-fibrous-chitin
#11
Sonia Żółtowska-Aksamitowska, Mikhail Tsurkan, Swee-Cheng Lim, Heike Meissner, Konstantin Tabachnick, Lamiaa A Shaala, Diaa T A Youssef, Viatcheslav N Ivanenko, Iaroslav Petrenko, Marcin Wysokowski, Nicole Bechmann, Yvonne Joseph, Teofil Jesionowski, Hermann Ehrlich
Among marine demosponges (Porifera: Demospongiae), only representatives of the order Verongiida have been recognized to synthetize both biologically active substances as well as scaffolds-like fibrous skeletons made of structural aminopolysaccharide chitin. The unique 3D architecture of such scaffolds open perspectives for their applications in waste treatment, biomimetics and tissue engineering. Here, we focus special attention to the demosponge Pseudoceratina purpurea collected in the coastal waters of Singapore...
February 13, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29450770/how-can-water-quality-be-improved-when-the-urban-waste-water-directive-has-been-fulfilled-a-case-study-of-the-lot-river-france
#12
Josette Garnier, Antsiva Ramarson, Vincent Thieu, Julien Némery, Sylvain Théry, Gilles Billen, Alexandra Coynel
The Lot river, a major tributary of the downstream Garonne river, the largest river on the Northern side of the Pyrenees Mountains, was intensively studied in the 1970s. A pioneering program called "Lot Rivière Claire" provided a diagnosis of water quality at the scale of the whole watershed and proposed an ambitious program to manage nutrient pollution and eutrophication largely caused by urban wastewater releases. Later on, the implementation of European directives from 1991 to 2000 resulted in the nearly complete treatment of point sources of pollution in spite of a doubling of the basin's population...
February 15, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29450106/optical-system-design-for-noncontact-normal-incidence-thz-imaging-of-in-vivo-human-cornea
#13
Shijun Sung, Shahab Dabironezare, Nuria Llombart, Skyler Selvin, Neha Bajwa, Somporn Chantra, Bryan Nowroozi, James Garritano, Jacob Goell, Alex Li, Sophie X Deng, Elliott Brown, Warren S Grundfest, Zachary D Taylor
Reflection mode Terahertz (THz) imaging of corneal tissue water content (CTWC) is a proposed method for early, accurate detection and study of corneal diseases. Despite promising results from ex vivo and in vivo cornea studies, interpretation of the reflectivity data is confounded by the contact between corneal tissue and dielectric windows used to flatten the imaging field. Herein, we present an optical design for non-contact THz imaging of cornea. A beam scanning methodology performs angular, normal incidence sweeps of a focused beam over the corneal surface while keeping the source, detector, and patient stationary...
January 2018: IEEE Transactions on Terahertz Science and Technology
https://www.readbyqxmd.com/read/29449198/a-rare-colonization-in-the-peritonitis-following-blunt-abdominal-trauma
#14
Oana Bulat, Cristian Bulat, Mihaela Blaj, Ioana Lupusoru, Viorel Scripcariu
BACKGROUND: Schewanella spp. is Gram-negative bacteria, saprophytes and rarely pathogenic. Initially isolated in 193, these belong to the marine environment; Schewanella (Pseudomonas) putrefaciens was found in water, soil and animal sources and produces hydrogen sulphide. Saccharomyces cerevisiae is the well-known yeast used for fermentation in industry and in molecular biology for research. In humans, it is a very rare pathogen which colonises the digestive tract and its utility has been linked to the treatment and prevention of diarrhoea associated with Clostridium difficile...
February 15, 2018: Balkan Medical Journal
https://www.readbyqxmd.com/read/29448394/attenuation-of-slow-10-40-ev-electrons-in-soft-nanoparticles-size-matters-in-argon-clusters
#15
Mathias Winkler, Knut J Børve
Electron attenuation due to inelastic and elastic scattering in condensed media can often be described in terms of the effective attenuation length (EAL) of the electron. The EAL is thus an important parameter for describing electron transport processes as exemplified by dissipation of energy following radiolysis. Focusing on electrons at low electron kinetic energies (10-40 eV) in condensed argon, we determine EAL from x-ray photoelectron spectra of argon nanoparticles and compare to values obtained from valence ionization in thin argon films as well as from gas-phase electron-scattering data...
January 2018: Physical Review. E
https://www.readbyqxmd.com/read/29448194/map-of-impact-by-acid-mine-drainage-in-the-river-network-of-the-iberian-pyrite-belt-sw-spain
#16
J A Grande, M Santisteban, M L de la Torre, J M Dávila, E Pérez-Ostalé
The Iberian Pyrite Belt (IPB), in the southwest of Europe, is characterized by high levels of contamination by acid mine drainage (AMD) in a large extent of its river network. In this scenario, it is necessary to characterize the degree of pollution of the mining leachates in the AMD-generating sources as well as of the main receiving watercourses. A map of impact of each basin was developed, based on the model proposed by Grande (2011) and the European Directive 98/83/EC that defines the quality standards for drinking water...
February 8, 2018: Chemosphere
https://www.readbyqxmd.com/read/29448079/identifying-the-underlying-causes-of-biological-instability-in-a-full-scale-drinking-water-supply-system
#17
Alina Nescerecka, Talis Juhna, Frederik Hammes
Changes in bacterial concentration and composition in drinking water during distribution are often attributed to biological (in)stability. Here we assessed temporal biological stability in a full-scale distribution network (DN) supplied with different types of source water: treated and chlorinated surface water and chlorinated groundwater produced at three water treatment plants (WTP). Monitoring was performed weekly during 12 months in two locations in the DN. Flow cytometric total and intact cell concentration (ICC) measurements showed considerable seasonal fluctuations, which were different for two locations...
February 6, 2018: Water Research
https://www.readbyqxmd.com/read/29448024/how-to-avoid-eutrophication-in-coastal-seas-a-new-approach-to-derive-river-specific-combined-nitrate-and-phosphate-maximum-concentrations
#18
Alain Ménesguen, Xavier Desmit, Valérie Dulière, Geneviève Lacroix, Bénédicte Thouvenin, Vincent Thieu, Morgan Dussauze
Since 1950, increase in nitrogen (N) and phosphorus (P) river loadings in the North-East Atlantic (NEA) continental seas has induced a deep change in the marine coastal ecosystems, leading to eutrophication symptoms in some areas. In order to recover a Good Ecological Status (GES) in the NEA, as required by European Water Framework Directive (WFD) and Marine Strategy Framework Directive (MSFD), reductions in N- and P-river loadings are necessary but they need to be minimal due to their economic impact on the farming industry...
February 12, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29448022/photosynthesis-and-mineralogy-of-jania-rubens-at-low-ph-high-pco-2-a-future-perspective
#19
Lucia Porzio, Maria Cristina Buia, Viviana Ferretti, Maurizio Lorenti, Manuela Rossi, Marco Trifuoggi, Alessandro Vergara, Carmen Arena
Corallinales (Rhodophyta) are high Mg-calcite macroalgae and are considered among the most vulnerable organisms to ocean acidification (OA). These sensitive species play fundamental roles in coastal systems as food source and settlement promoters as well as being involved in reef stabilization, and water carbonate balance. At present only a few studies are focused on erect calcifying macroalgae under low pH/high pCO 2 and the contrasting results make difficult to predict the ecological consequences of the OA on the coralline algae...
February 12, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29448019/recovery-of-black-necked-swans-macrophytes-and-water-quality-in-a-ramsar-wetland-of-southern-chile-assessing-resilience-following-sudden-anthropogenic-disturbances
#20
Eduardo Jaramillo, Nelson A Lagos, Fabio A Labra, Enrique Paredes, Emilio Acuña, Daniel Melnick, Mario Manzano, Carlos Velásquez, Cristian Duarte
In 2004 migration and mortality for unknown reasons of the herbivorous Black necked swan (Cygnus melancorhyphus (Molina, 1782)) occurred within the Río Cruces wetland (southern Chile), a Ramsar Site and nature sanctuary. Before 2004, this wetland hosted the largest breeding population of this water bird in the Neotropic Realm. The concurrent decrease in the spatial occurrence of the aquatic plant Egeria densa Planch. 1849 - the main food source of swans - was proposed as a cause for swan migration and mortality...
February 12, 2018: Science of the Total Environment
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