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https://www.readbyqxmd.com/read/28088717/removal-of-antibiotic-resistance-genes-from-wastewater-treatment-plant-effluent-by-coagulation
#1
Na Li, Guo-Ping Sheng, Yong-Ze Lu, Raymond J Zeng, Han-Qing Yu
Antibiotic resistance genes (ARGs), as emerging environmental contaminants, have become a threat to human health. Recent studies have demonstrated that the effluent from wastewater treatment plants is a significant point source of ARGs released into the environment. In this study, we investigated the effectiveness of coagulation technology in the removal of ARGs from treated wastewater. Specifically, we measured the removal of five ARGs (two sulfonamide resistance genes, sulI and sulII, and three tetracycline resistance genes, tetO, tetW and tetQ) and the class 1 integron intI1 gene via the application of two coagulants: FeCl3 and polyferric chloride (PFC)...
January 4, 2017: Water Research
https://www.readbyqxmd.com/read/28088716/unveiling-the-transformation-and-bioavailability-of-dissolved-organic-matter-in-contrasting-hydrothermal-vents-using-fluorescence-eem-parafac
#2
Liyang Yang, Wan-E Zhuang, Chen-Tung Arthur Chen, Bing-Jye Wang, Fu-Wen Kuo
The submarine hydrothermal systems are extreme environments where active cycling of dissolved organic matter (DOM) may occur. However, little is known about the optical properties and bioavailability of hydrothermal DOM, which could provide valuable insights into its transformation processes and biogeochemical reactivity. The quantity, quality, and bioavailability of DOM were investigated for four very different hydrothermal vents east of Taiwan, using dissolved organic carbon (DOC), absorption spectroscopy, and fluorescence excitation-emission matrices-parallel factor analysis (EEM-PARAFAC)...
January 3, 2017: Water Research
https://www.readbyqxmd.com/read/28088543/transformation-of-terrestrial-organic-matter-along-thermokarst-affected-permafrost-coasts-in-the-arctic
#3
George Tanski, Hugues Lantuit, Saskia Ruttor, Christian Knoblauch, Boris Radosavljevic, Jens Strauss, Juliane Wolter, Anna M Irrgang, Justine Ramage, Michael Fritz
The changing climate in the Arctic has a profound impact on permafrost coasts, which are subject to intensified thermokarst formation and erosion. Consequently, terrestrial organic matter (OM) is mobilized and transported into the nearshore zone. Yet, little is known about the fate of mobilized OM before and after entering the ocean. In this study we investigated a retrogressive thaw slump (RTS) on Qikiqtaruk - Herschel Island (Yukon coast, Canada). The RTS was classified into an undisturbed, a disturbed (thermokarst-affected) and a nearshore zone and sampled systematically along transects...
January 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28081161/factors-related-with-ch4-and-n2o-emissions-from-a-paddy-field-clues-for-management-implications
#4
Chun Wang, Derrick Y F Lai, Jordi Sardans, Weiqi Wang, Congsheng Zeng, Josep Peñuelas
Paddy fields are major sources of global atmospheric greenhouse gases, including methane (CH4) and nitrous oxide (N2O). The different phases previous to emission (production, transport, diffusion, dissolution in pore water and ebullition) despite well-established have rarely been measured in field conditions. We examined them and their relationships with temperature, soil traits and plant biomass in a paddy field in Fujian, southeastern China. CH4 emission was positively correlated with CH4 production, plant-mediated transport, ebullition, diffusion, and concentration of dissolved CH4 in porewater and negatively correlated with sulfate concentration, suggesting the potential use of sulfate fertilizers to mitigate CH4 release...
2017: PloS One
https://www.readbyqxmd.com/read/28081154/sensitization-of-radioresistant-prostate-cancer-cells-by-resveratrol-isolated-from-arachis-hypogaea-stems
#5
Yu-An Chen, Hsiu-Man Lien, Min-Chuan Kao, U-Ging Lo, Li-Chiung Lin, Chun-Jung Lin, Sheau-Jiun Chang, Chia-Chang Chen, Jer-Tsong Hsieh, Ho Lin, Chih-Hsin Tang, Chih-Ho Lai
Resveratrol (RV, 3,4',5-trihydroxystilbene) is naturally produced by a wide variety of plants including grapes and peanuts (Arachis hypogaea). However, the yield of RV from peanut stem and its potential radiosensitizing effects in prostate cancer (PCa) have not been well investigated. In this study, we characterized RV in peanut stem extract (PSE) for the first time and showed that both RV and PSE dose-dependently induced cell death in DOC-2/DAB2 interactive protein (DAB2IP)-deficient PCa cells with the radioresistant phenotype...
2017: PloS One
https://www.readbyqxmd.com/read/28079272/salinity-dissolved-organic-carbon-and-inter-population-variability-hardly-influence-the-accumulation-and-effect-of-cu-in-mytilus-edulis
#6
David Deruytter, Michiel B Vandegehuchte, Jan Garrevoet, Ronny Blust, Laszlo Vincze, Karel A C De Schamphelaere, Colin R Janssen
To improve the ecological relevance of environmental risk assessment (ERA) we need to improve our understanding of: (1) the influence of environmental conditions on the toxicity of pollutants, and (2) the effect of these factors in combination with possible inter-population variability. In this study the influence of salinity and dissolved organic carbon (DOC) on the accumulation and effect of Cu to settled mussels was investigated with mussels from a North Sea and a Baltic Sea population. We found that both populations were equally Cu sensitive even though the Baltic Sea population lives in suboptimal conditions...
January 12, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28073095/enhanced-wwtp-effluent-organic-matter-removal-in-hybrid-ozonation-coagulation-hoc-process-catalyzed-by-al-based-coagulant
#7
Xin Jin, Pengkang Jin, Rui Hou, Lei Yang, Xiaochang C Wang
A novel hybrid ozonation-coagulation (HOC) process was developed for application in wastewater reclamation. In this process, ozonation and coagulation occurred simultaneously within a single unit. Compared with the conventional pre-ozonation-coagulation process, the HOC process exhibited much better performance in removing dissolved organic matters. In particular, the maximal organic matters removal efficiency was obtained at the ozone dosage of 1mgO3/mg DOC at each pH value (pH 5, 7 and 9). In order to interpret the mechanism of the HOC process, ozone decomposition was monitored...
December 26, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28073059/role-of-microgel-formation-in-scavenging-of-chromophoric-dissolved-organic-matter-and-heavy-metals-in-a-river-sea-system
#8
Ruei-Feng Shiu, Chon-Lin Lee
We use riverine and marine dissolved organic carbon (DOC) polymers to examine their aggregation behavior, and to evaluate the roles of microgel formation in scavenging of chromophoric dissolved organic matter (CDOM) and heavy metals in a river-sea system. Our results indicate that riverine and marine microgels did not exhibit very much difference in size and self-assembly curve; however, the assembly effectiveness ([microgel]/DOC) of marine samples was much higher than riverine. Instead of concentration of DOC, other factors such as types and sources of DOC polymers may control the microgel abundance in aquatic environments...
January 3, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28073055/co2-emissions-from-german-drinking-water-reservoirs
#9
Helmi Saidi, Matthias Koschorreck
Globally, reservoirs are a significant source of atmospheric CO2. However, precise quantification of greenhouse gas emissions from drinking water reservoirs on the regional or national scale is still challenging. We calculated CO2 fluxes for 39 German drinking water reservoirs during a period of 22years (1991-2013) using routine monitoring data in order to quantify total emission of CO2 from drinking water reservoirs in Germany and to identify major drivers. All reservoirs were a net CO2 source with a median flux of 167gCm(-2)y(-1), which makes gaseous emissions a relevant process for the carbon budget of each reservoir...
January 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28070815/microbial-transformation-of-intracellular-dissolved-organic-matter-from-microcystis-aeruginosa-and-its-effect-on-the-binding-of-pyrene-under-oxic-and-anoxic-conditions
#10
Chenghu Yang, Yangzhi Liu, Yaxian Zhu, Yong Zhang
The environmental behaviour and the bioavailability of polycyclic aromatic hydrocarbons (PAHs) are strongly affected by dissolved organic matter (DOM) in aquatic environments. In this study, we investigated the dynamics of the bioavailability and character of the intracellular DOM (IDOM) from Microcystis aeruginosa (M. aeruginosa-IDOM) during 10 days oxic and anoxic incubations by spectroscopy. Subsequently, the binding affinity of pyrene with the initial/altered M. aeruginosa-IDOM was estimated by fluorescence quenching method...
January 10, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28070286/influence-of-hydrological-pathways-on-dissolved-organic-carbon-fluxes-in-tropical-streams
#11
Eline Nayara Dantas da Costa, Jéssica Carneiro de Souza, Marilane Andrade Pereira, Marcelo Friederichs Landim de Souza, Weber Friederichs Landim de Souza, Daniela Mariano Lopes da Silva
Water flow pathways and water balance are fundamental components for understanding the dynamics of C in the soil/water interface of small basins. The objective of this study was to describe the seasonal variations and estimate the annual balance of dissolved organic carbon (DOC) by comparing two tropical microbasins (preserved forest-PF and cacao plantation-CP). Twenty-one weekly collections were conducted from September to December 2012 and from April to June 2013. The calculation of the partial balance considered precipitation (P) as inflow and the stream as outflow...
January 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28068536/application-of-uv-absorbance-and-fluorescence-indicators-to-assess-the-formation-of-biodegradable-dissolved-organic-carbon-and-bromate-during-ozonation
#12
Wen-Tao Li, Meng-Jie Cao, Tessora Young, Barbara Ruffino, Michael Dodd, Ai-Min Li, Gregory Korshin
This study examined the significance of changes of UV absorbance and fluorescence of dissolved organic matter (DOM) as surrogate indicators for assessing the formation of bromate and biodegradable dissolved organic carbon (BDOC) during the ozonation of surface water and wastewater effluent. Spectroscopic monitoring was carried out using benchtop UV/Vis and fluorescence spectrophotometers and a newly developed miniature LED UV/fluorescence sensor capable of rapidly measuring UVA280 and protein-like and humic-like fluorescence...
January 3, 2017: Water Research
https://www.readbyqxmd.com/read/28065637/the-steroid-metabolite-16-%C3%AE-oh-androstenedione-generated-by-cyp21a2-serves-as-a-substrate-for-cyp19a1
#13
J Neunzig, M Milhim, L Schiffer, Y Khatri, J Zapp, A Sánchez-Guijo, M F Hartmann, S A Wudy, R Bernhardt
The 21-hydroxylase (CYP21A2) is a steroidogenic enzyme crucial for the synthesis of mineralo- and glucocorticoids. It is described to convert progesterone as well as 17-OH-progesterone, through a hydroxylation at position C21, into 11-deoxycorticosterone (DOC) and 11-deoxycortisol (RSS), respectively. In this study we unraveled CYP21A2 to have a broader steroid substrate spectrum than assumed. Utilizing a reconstituted in vitro system, consisting of purified human CYP21A2 and human cytochrome P450 reductase (CPR) we demonstrated that CYP21A2 is capable to metabolize DOC, RSS, androstenedione (A4) and testosterone (T)...
January 5, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28063296/biodegradation-of-the-artificial-sweetener-acesulfame-in-biological-wastewater-treatment-and-sandfilters
#14
Sandro Castronovo, Arne Wick, Marco Scheurer, Karsten Nödler, Manoj Schulz, Thomas A Ternes
A considerable removal of the artificial sweetener acesulfame (ACE) was observed during activated sludge processes at 13 wastewater treatment plants (WWTPs) as well as in a full-scale sand filter of a water works. A long-term sampling campaign over a period of almost two years revealed that ACE removal in WWTPs can be highly variable over time. Nitrifying/denitrifying sequencing batch reactors (SBR) as well as aerobic batch experiments with activated sludge and filter sand from a water works confirmed that both activated sludge as well as filter sand can efficiently remove ACE and that the removal can be attributed to biologically mediated degradation processes...
November 17, 2016: Water Research
https://www.readbyqxmd.com/read/28061342/a-low-pressure-gravity-driven-membrane-filtration-gdm-system-for-rainwater-recycling-flux-stabilization-and-removal-performance
#15
An Ding, Jinlong Wang, Dachao Lin, Xiaobin Tang, Xiaoxiang Cheng, Hui Wang, Langming Bai, Guibai Li, Heng Liang
Rainwater is a nature resource, which can be widely used for non-potable and potable applications in water scared countries after appropriate treatment. Gravity-driven membrane filtration (GDM) process is a promising technology for decentralized rainwater treatment due to no backwashing, flushing and chemical cleaning. In this study, we established a single lab-scale GDM system for the stored rainwater (simulative cellar rainwater) treatment with two months operation, and a stored tap water was used as a compared system to evaluate the permeability and organics removal performance...
December 27, 2016: Chemosphere
https://www.readbyqxmd.com/read/28059800/twist-and-turn-into-chronic-disorders-of%C3%A2-consciousness-potential-role-of%C3%A2-the%C3%A2-auditory-stapedial-reflex
#16
Antonino Naro, Rocco Bruno, Antonino Leo, Margherita Russo, Carlo Salviera, Alessia Bramanti, Placido Bramanti, Rocco Salvatore Calabrò
BACKGROUND: Patients suffering from chronic disorders of consciousness (DOC), including minimally conscious state (MCS) and unresponsive wakefulness syndrome (UWS), typically show an awareness impairment paralleled by a significant reflex hyper-excitability, which depend on the cortical deafferentation following brain-damage-induced thalamocortical system deterioration. Nonetheless, recent studies have shown a residual preservation of cortico-subcortical pathways that may sustain residual fragments of awareness in some DOC patients...
January 3, 2017: Restorative Neurology and Neuroscience
https://www.readbyqxmd.com/read/28057269/t-box-genes-in-drosophila-limb-development
#17
G O Pflugfelder, F Eichinger, J Shen
T-box genes are essential for limb development in vertebrates and arthropods. The Drosophila genome encodes eight T-box genes, six of which are expressed in limb ontogenesis. The Tbx20-related gene pair midline and H15 is essential for dorso-ventral patterning of the Drosophila legs. The three Tbx6-related Dorsocross genes are required for epithelial remodeling during wing development. The Drosophila gene optomotor-blind (omb) is the only member of the Tbx2 subfamily in the fly and is predominantly involved in wing development...
2017: Current Topics in Developmental Biology
https://www.readbyqxmd.com/read/28052498/solute-and-sediment-export-from-amazon-forest-and-soybean-headwater-streams
#18
Shelby H Riskin, Christopher Neill, KathiJo Jankowski, Alex V Krusche, Richard McHorney, Helmut Elsenbeer, Marcia N Macedo, Darlisson Nunes, Stephen Porder
Intensive cropland agriculture commonly increases streamwater solute concentrations and export from small watersheds. In recent decades, the lowland tropics have become the world's largest and most important region of cropland expansion. Although the effects of intensive cropland agriculture on streamwater chemistry and watershed export have been widely studied in temperate regions, their effects in tropical regions are poorly understood. We sampled seven headwater streams draining watersheds in forest (n = 3) or soybeans (n = 4) to examine the effects of soybean cropping on stream solute concentrations and watershed export in a region of rapid soybean expansion in the Brazilian state of Mato Grosso...
January 2017: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28045504/will-aerosol-hygroscopicity-change-with-biodiesel-renewable-diesel-fuels-and-emission-control-technologies
#19
Diep Vu, Daniel Z Short, Georgios Karavalakis, Thomas D Durbin, Akua Asa-Awuku
The use of biodiesel and renewable diesel fuels in compression ignition engines and aftertreatment technologies may affect vehicle exhaust emissions. In this study two 2012 light-duty vehicles equipped with direct injection diesel engines, diesel oxidation catalyst (DOC), diesel particulate filter (DPF), and selective catalytic reduction (SCR) were tested on a chassis dynamometer. One vehicle was tested over the Federal Test Procedure (FTP) cycle on seven biodiesel and renewable diesel fuel blends. Both vehicles were exercised over double Environmental Protection Agency (EPA) Highway fuel economy test (HWFET) cycles on ultra-low sulfur diesel (ULSD) and a soy-based biodiesel blend to investigate the aerosol hygroscopicity during the regeneration of the DPF...
January 3, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28041983/basic-discriminative-and-semantic-processing-in-patients-in-the-vegetative-and-minimally-conscious-state
#20
Helena Erlbeck, Ruben G L Real, Boris Kotchoubey, Donatella Mattia, Jakob Bargak, Andrea Kübler
Patients who survive injuries to the brain following accidents or diseases often acquire a disorder of consciousness (DOC). Assessment of the state of consciousness in these patients is difficult since they are usually incapable of reproducible motor movements. The application of event-related potentials (ERP) recorded via EEG constitutes one promising approach to complement the assessment of cognitive functions in DOC patients. For these assessments, a hierarchical approach was suggested which means that paradigms aiming at higher order ERPs are only presented if early responses were found...
December 29, 2016: International Journal of Psychophysiology
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