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https://www.readbyqxmd.com/read/28636199/widespread-occurrence-and-potential-for-biodegradation-of-bioactive-contaminants-in-congaree-national-park-usa
#1
Paul M Bradley, William A Battaglin, Jimmy M Clark, Frank Henning, Michelle L Hladik, Luke R Iwanowicz, Celeste A Journey, Jeffrey W Riley, Kristin M Romanok
Organic contaminants with designed molecular bioactivity, such as pesticides and pharmaceuticals, originate from human and agricultural sources, occur frequently in surface waters, and threaten the structure and function of aquatic and terrestrial ecosystems. Congaree National Park in South Carolina (USA) is a vulnerable park unit due to its location downstream of multiple urban and agricultural contaminant sources and its hydrologic setting, being composed almost entirely of floodplain and aquatic environments...
June 21, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28636035/development-of-air-stable-hydrogen-evolution-catalysts
#2
Biswajit Mondal, Abhishek Dey
Obtaining abundant pure hydrogen by reduction of water has an important implication in the development of clean and renewable energy. Hence research focused on the development of non-noble metal based facile and energy efficient catalysts for proton reduction is on the rise. However, for practical utilization, it is necessary that these complexes function unabated in the presence of atmospheric oxygen and other common contaminants in abundant water sources. There has been very little activity towards the development of oxygen-tolerant hydrogen producing catalysts...
June 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28636001/wataa-atlas-of-protein-hydration-exploring-synergies-between-data-mining-and-ab-initio-calculations
#3
Jiří Černý, Bohdan Schneider, Lada Biedermannová
Water molecules represent an integral part of proteins and a key determinant of protein structure, dynamics and function. WatAA is a newly developed, web-based atlas of amino-acid hydration in proteins. The atlas provides information about the ordered first hydration shell of the most populated amino-acid conformers in proteins. The data presented in the atlas are drawn from two sources: experimental data and ab initio quantum-mechanics calculations. The experimental part is based on a data-mining study of a large set of high-resolution protein crystal structures...
June 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28634805/comparative-prevalence-of-escherichia-coli-carrying-virulence-genes-and-class-1-and-2-integrons-in-sub-tropical-and-cool-temperate-freshwater
#4
Jatinder P S Sidhu, Paul Jagals, Amy Smith, Simon Toze
Aquatic environments are now recognized secondary habitat of potentially pathogenic Escherichia coli. In this study, PCR-based analyses were used to determine the phylogenetic composition and frequency of occurrence of eight clinically significant virulence genes (VGs) in E. coli isolates from sub-tropical Brisbane and cool temperate Tasmania freshwater in Australia. In Brisbane, non-commensal E. coli isolates belonging to the B2 and D phylogenetic group were dominant (72%). A significantly higher number (P < 0...
June 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28633947/occurrence-and-spatial-distribution-of-organophosphorus-flame-retardants-and-plasticizers-in-the-bohai-and-yellow-seas-china
#5
Mingyu Zhong, Jianhui Tang, Lijie Mi, Fei Li, Runmei Wang, Guopei Huang, Huifeng Wu
Seawater samples from 50 sites in the BS and YS were collected to investigate the spatial distribution of 7 OPs. Concentrations of the total OPs (ƩOPs) in the BS and YS ranged from 8.12ngL(-1) to 98.04ngL(-1) with a geometric mean (GM) of 23.70ngL(-1). Tris(1-chloro-2-propyl) phosphate (TCPP) was the dominant compound, followed by tris(2-chloroethyl) phosphate (TCEP) and triphenylphosphine oxide (TPPO). The ƩOPs together with the most commonly detected individual OPs (TCPP, TCEP, tris(1,3-dichloro-2-propyl) phosphate (TDCPP), tri-iso-butyl phosphate (TiBP), triphenyl phosphate (TPhP), and TPPO) tended to decrease from nearshore to offshore and from the surface to the bottom seawaters, indicating major land-based sources...
June 17, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28633521/consideration-of-natural-sources-in-a-bacteria-tmdl-lines-of-evidence-including-beach-microbial-source-tracking
#6
Kelly D Goodwin, Alexander Schriewer, Andrew Jirik, Kathryn Curtis, Andrea Crumpacker
Total Maximum Daily Load (TMDL) stipulations remained unmet at a southern California beach despite a suite of management actions carried out since 2001, prompting exploration of a Natural Sources Exclusion (NSE) provision within the TMDL. Quantitative Microbial Source Tracking (MST) was employed from 2012-2015 to inventory sources of natural and anthropogenic fecal indicator bacteria (FIB). Data suggested FIB exceedances could be traced to gulls based on gull marker prevalence and correlations with FIB concentrations in seawater, sand and eelgrass...
June 21, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28633387/anal-intercourse-among-female-sex-workers-in-c%C3%A3-te-d-ivoire-prevalence-determinants-and-model-based-estimates-of-the-population-level-impact-on-hiv-transmission
#7
Mathieu Maheu-Giroux, Stefan Baral, Juan F Vesga, Daouda Diouf, Souleymane Diabaté, Michel Alary, Kouamé Abo, Marie-Claude Boily
Current evidence suggests that anal intercourse (AI) during sex work is common in sub-Saharan Africa, but few studies investigated the contribution of heterosexual AI to HIV epidemics. Using a respondent-driven sampling survey of female sex workers (FSW) in Abidjan (2014), we estimated AI prevalence and frequency. Poisson regressions were used to identify AI determinants. About 20% of FSW (N = 466) engaged in AI during a normal week (95% confidence intervals: 15-26%). Women who performed AI were generally younger, had been selling sex for longer, were born in Côte d'Ivoire, reported higher sex-work income, more frequent sex in public places, and violence from clients than women not reporting AI...
June 14, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28632318/-the-easier-the-better-preparation-of-efficient-photocatalysts-metastable-poly-heptazine-imide-salts
#8
Zupeng Chen, Aleksandr Savateev, Sergey Pronkin, Vasiliki Papaefthimiou, Christian Wolff, Marc Georg Willinger, Elena Willinger, Dieter Neher, Markus Antonietti, Dariya Dontsova
Cost-efficient, visible-light-driven hydrogen production from water is an attractive potential source of clean, sustainable fuel. Here, it is shown that thermal solid state reactions of traditional carbon nitride precursors (cyanamide, melamine) with NaCl, KCl, or CsCl are a cheap and straightforward way to prepare poly(heptazine imide) alkali metal salts, whose thermodynamic stability decreases upon the increase of the metal atom size. The chemical structure of the prepared salts is confirmed by the results of X-ray photoelectron and infrared spectroscopies, powder X-ray diffraction and electron microscopy studies, and, in the case of sodium poly(heptazine imide), additionally by atomic pair distribution function analysis and 2D powder X-ray diffraction pattern simulations...
June 20, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28631272/a-unique-fatal-moose-attack-mimicking-homicide
#9
Petur Gudmannsson, Johan Berge, Henrik Druid, Göran Ericsson, Anders Eriksson
Fatalities caused by animal attacks are rare, but have the potential to mimic homicide. We present a case in which a moose attacked and killed a woman who was walking her dog in a forest. Autopsy showed widespread blunt trauma with a large laceration on one leg in which blades of grass were embedded. Flail chest was the cause of death. The case was initially conceived as homicide by means of a riding lawn mower. A review of the case by moose experts and analyses of biological trace material that proved to originate from moose, established the true source of injury...
June 20, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28630712/quantifying-drivers-of-wild-pig-movement-across-multiple-spatial-and-temporal-scales
#10
Shannon L Kay, Justin W Fischer, Andrew J Monaghan, James C Beasley, Raoul Boughton, Tyler A Campbell, Susan M Cooper, Stephen S Ditchkoff, Steve B Hartley, John C Kilgo, Samantha M Wisely, A Christy Wyckoff, Kurt C VerCauteren, Kim M Pepin
BACKGROUND: The movement behavior of an animal is determined by extrinsic and intrinsic factors that operate at multiple spatio-temporal scales, yet much of our knowledge of animal movement comes from studies that examine only one or two scales concurrently. Understanding the drivers of animal movement across multiple scales is crucial for understanding the fundamentals of movement ecology, predicting changes in distribution, describing disease dynamics, and identifying efficient methods of wildlife conservation and management...
2017: Movement Ecology
https://www.readbyqxmd.com/read/28630628/staphylococcus-saprophyticus-recovered-from-humans-food-and-recreational-waters-in-rio-de-janeiro-brazil
#11
Viviane Santos de Sousa, Ana Paula de Souza da-Silva, Leif Sorenson, Raphael Paiva Paschoal, Renata Fernandes Rabello, Eloiza Helena Campana, Márcia Soares Pinheiro, Lyssa Oliveira Ferreira Dos Santos, Natacha Martins, Ana Carolina Nunes Botelho, Renata Cristina Picão, Sérgio Eduardo Longo Fracalanzza, Lee Woodland Riley, George Sensabaugh, Beatriz Meurer Moreira
Staphylococcus saprophyticus is an important agent of urinary tract infection (UTI) in young women, but information about this pathogen in human microbiota and in common environment is lacking. The aim of this study was to characterize S. saprophyticus isolates from genitoanal microbiota of 621 pregnant women, 10 minas cheese packs, and five beaches in Rio de Janeiro city and compare PFGE profiles of these isolates with five UTI PFGE clusters described in this city. We investigated 65 S. saprophyticus isolates from microbiota, 13 from minas cheese, and 30 from beaches and 32 UTI isolates...
2017: International Journal of Microbiology
https://www.readbyqxmd.com/read/28630346/the-role-of-jet-and-film-drops-in-controlling-the-mixing-state-of-submicron-sea-spray-aerosol-particles
#12
Xiaofei Wang, Grant B Deane, Kathryn A Moore, Olivia S Ryder, M Dale Stokes, Charlotte M Beall, Douglas B Collins, Mitchell V Santander, Susannah M Burrows, Camille M Sultana, Kimberly A Prather
The oceans represent a significant global source of atmospheric aerosols. Sea spray aerosol (SSA) particles comprise sea salts and organic species in varying proportions. In addition to size, the overall composition of SSA particles determines how effectively they can form cloud droplets and ice crystals. Thus, understanding the factors controlling SSA composition is critical to predicting aerosol impacts on clouds and climate. It is often assumed that submicrometer SSAs are mainly formed by film drops produced from bursting bubble-cap films, which become enriched with hydrophobic organic species contained within the sea surface microlayer...
June 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28630307/nanophotonics-enabled-solar-membrane-distillation-for-off-grid-water-purification
#13
Pratiksha D Dongare, Alessandro Alabastri, Seth Pedersen, Katherine R Zodrow, Nathaniel J Hogan, Oara Neumann, Jinjian Wu, Tianxiao Wang, Akshay Deshmukh, Menachem Elimelech, Qilin Li, Peter Nordlander, Naomi J Halas
With more than a billion people lacking accessible drinking water, there is a critical need to convert nonpotable sources such as seawater to water suitable for human use. However, energy requirements of desalination plants account for half their operating costs, so alternative, lower energy approaches are equally critical. Membrane distillation (MD) has shown potential due to its low operating temperature and pressure requirements, but the requirement of heating the input water makes it energy intensive. Here, we demonstrate nanophotonics-enabled solar membrane distillation (NESMD), where highly localized photothermal heating induced by solar illumination alone drives the distillation process, entirely eliminating the requirement of heating the input water...
June 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28630153/membrane-spanning-%C3%AE-helical-barrels-as-tractable-protein-design-targets
#14
REVIEW
Ai Niitsu, Jack W Heal, Kerstin Fauland, Andrew R Thomson, Derek N Woolfson
The rational (de novo) design of membrane-spanning proteins lags behind that for water-soluble globular proteins. This is due to gaps in our knowledge of membrane-protein structure, and experimental difficulties in studying such proteins compared to water-soluble counterparts. One limiting factor is the small number of experimentally determined three-dimensional structures for transmembrane proteins. By contrast, many tens of thousands of globular protein structures provide a rich source of 'scaffolds' for protein design, and the means to garner sequence-to-structure relationships to guide the design process...
August 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28629648/ten-reasons-to-embrace-scientism
#15
Rik Peels
A strong version of scientism, such as that of Alex Rosenberg, says, roughly, that natural science reliably delivers rational belief or knowledge, whereas common sense sources of belief, such as moral intuition, memory, and introspection, do not. In this paper I discuss ten reasons that adherents of scientism have or might put forward in defence of scientism. The aim is to show which considerations could plausibly count in favour of scientism and what this implies for the way scientism ought to be formulated...
June 2017: Studies in History and Philosophy of Science
https://www.readbyqxmd.com/read/28629219/thermally-induced-generation-of-desirable-aroma-active-compounds-from-the-glucosinolate-sinigrin
#16
Eva Ortner, Michael Granvogl
Glucosinolates are the most abundant secondary sulfur-containing plant metabolites in the plant family of Brassicaceae. These phytochemicals are well-known for their enzymatic degradation induced by the enzyme myrosinase resulting in pungent odor impressions derived from their respective degradation products. However, up to now, only little attention has been paid to non-enzymatic thermal degradation and the release of additional aroma-active compounds. Thermal treatment is particularly important in the processing of Brassica vegetables, and, thereby, glucosinolates as precursors can act as a natural source of odorants...
June 20, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28629102/bioelectrochemical-approach-for-control-of-methane-emission-from-wetlands
#17
Shentan Liu, Xiaojuan Feng, Xianning Li
To harvest electricity and mitigate methane emissions from wetlands, a novel microbial fuel cell coupled constructed wetland (MFC-CW) was assembled with an anode placing in the rhizosphere and a cathode on the water surface. Plant-mediated methane accounted for 71-82% of the total methane fluxes. The bioanode served as an inexhaustible source of electron acceptors and resulted in reduced substantial methane emissions owing to electricigens outcompeting methanogens for carbon and electrons when substrate was deficient...
June 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28628973/a-baseline-survey-of-dissolved-methane-in-aquifers-of-great-britain
#18
R A Bell, W G Darling, R S Ward, L Basava-Reddi, L Halwa, K Manamsa, B E Ó Dochartaigh
Interest in dissolved methane (CH4) concentrations in aquifers in England, Scotland and Wales ('Great Britain' or GB) has grown concurrently with interest in the exploitation of unconventional gas sources (UGS). Experience, mainly from North America, has shown the importance of a pre-production baseline against which changes possibly due to UGS extraction can be compared. The British Geological Survey, aided by water utilities, private users and regulators, has compiled a unique dataset for CH4 in groundwaters of GB...
June 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28628879/development-of-a-method-for-the-characterization-and-operation-of-uv-led-for-water-treatment
#19
Ataollah Kheyrandish, Madjid Mohseni, Fariborz Taghipour
Tremendous improvements in semiconductor technology have made ultraviolet light-emitting diodes (UV-LEDs) a viable alternative to conventional UV sources for water treatment. A robust and validated experimental protocol for studying the kinetics of microorganism inactivation is key to the further development of UV-LEDs for water treatment. This study proposes a protocol to operate UV-LEDs and control their output as a polychromatic radiation source. In order to systematically develop this protocol, the results of spectral power distribution, radiation profile, and radiant power measurements of a variety of UV-LEDs are presented...
June 6, 2017: Water Research
https://www.readbyqxmd.com/read/28628868/an-overview-on-exploration-and-environmental-impact-of-unconventional-gas-sources-and-treatment-options-for-produced-water
#20
REVIEW
Tânia L S Silva, Sergio Morales-Torres, Sérgio Castro-Silva, José L Figueiredo, Adrián M T Silva
Rising global energy demands associated to unbalanced allocation of water resources highlight the importance of water management solutions for the gas industry. Advanced drilling, completion and stimulation techniques for gas extraction, allow more economical access to unconventional gas reserves. This stimulated a shale gas revolution, besides tight gas and coalbed methane, also causing escalating water handling challenges in order to avoid a major impact on the environment. Hydraulic fracturing allied to horizontal drilling is gaining higher relevance in the exploration of unconventional gas reserves, but a large amount of wastewater (known as "produced water") is generated...
June 16, 2017: Journal of Environmental Management
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