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https://www.readbyqxmd.com/read/29145081/elimination-of-chlorine-refractory-carbamazepine-by-breakpoint-chlorination-reactive-species-and-oxidation-byproducts
#1
Wen-Long Wang, Qian-Yuan Wu, Ye Du, Nan Huang, Hong-Ying Hu
Breakpoint chlorination can be commonly observed in the chlorination of water treatments when ammonia is present. In this study, it was found that breakpoint chlorination can remarkably eliminate a ubiquitous and chlorine-refractory micropollutant, carbamazepine (CBZ), with the removal of 72% at neutral condition. At neutral pH, low CBZ elimination was observed at a chlorine/ammonia molar ratio (Cl/N) of 1.0 and higher CBZ elimination was observed as Cl/N ratio increased from 1.0 to 1.6 (breakpoint), indicating that CBZ elimination was closely related to the generation and decomposition of chloramines...
November 7, 2017: Water Research
https://www.readbyqxmd.com/read/29145055/urban-stormwater-characterisation-and-nitrogen-composition-from-lot-scale-catchments-new-management-implications
#2
REVIEW
Terry Lucke, Darren Drapper, Andy Hornbuckle
Stormwater runoff from urban areas has been shown to contain a variety of pollutants which are often linked to the specific land use of the catchment. This research program investigated the pollutant concentrations in stormwater runoff from several sites in South-east Queensland (SEQ), in Australia. The study sites are predominantly single development lots, under 7.5hectares (Ha) in area, with a single land-use classification that have been developed with stormwater treatment measures to manage pollutant loads as required by local regulations...
November 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29144313/preliminary-results-of-water-quality-assessment-using-phytoplankton-and-physicochemical-approaches-in-the-huai-river-basin-china
#3
Hao Chen, Qi-Ting Zuo, Yong-Yong Zhang
Water pollution has been a significant issue in the Huai River Basin (HRB) of China since the late 1970s. In July and December 2013, two field investigations were carried out at 10 sites along the main streams of the basin. The monitoring indices contained both physicochemical variables and the structure and composition of phytoplankton communities. The correlations between communities and physicochemical variables were analyzed using cluster analysis and redundancy analysis. Moreover, water quality was evaluated using the comprehensive nutrition state index (TLI) and Shannon-Wiener diversity index (H)...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144312/effectiveness-of-septage-pre-treatment-in-vertical-flow-constructed-wetlands
#4
Beata Karolinczak, Wojciech Dąbrowski
Septage is wastewater stored temporarily in cesspools. A periodic supply of its significant quantities to small municipal wastewater treatment plants (WWTPs) may cause many operational problems. In the frame of the research, it has been proposed to utilize vertical flow constructed wetlands for pre-treatment of septage prior to its input to the biological stage of a WWTP. The aim of the work was to assess the effectiveness of pre-treatment in relation to factors such as: seasonality, hydraulic load, pollutants load of the VF bed and interactions between these factors...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29143852/exposure-to-sublethal-ammonia-concentrations-alters-the-duration-and-intensity-of-agonistic-interactions-in-the-crayfish-orconectes-rusticus
#5
David D Edwards, Katie L Klotz, Paul A Moore
Crayfish extract information from chemical stimuli during social interactions. Commercial fertilizers increase background ammonia concentrations which may interfere with chemical communication. Background pollution can disrupt perception of chemical stimuli in three ways: masking, sensory impairment, physiological impairment or in combination. We investigated whether exposure to ammonia alters agonistic behavior. Crayfish pairs exposed to 0.9 mg/L ammonia fought for a longer duration, while crayfish exposed to 9...
November 16, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29143851/phylogenetic-diversity-and-distribution-of-bacterial-and-archaeal-amoa-genes-in-the-east-china-sea-during-spring
#6
Takafumi Kataoka, Koji Suzuki, Tomohisa Irino, Masanobu Yamamoto, Seigo Higashi, Hongbin Liu
Microbial nitrification is a key process in the nitrogen cycle in the continental shelf ecosystems. The genotype compositions and abundance of the ammonia monooxygenase gene, amoA, derived from ammonia-oxidizing archaea (AOA) and bacteria (AOB) in two size fractions (2-10 and 0.2-2 µm), were investigated in the East China Sea (ECS) in May 2008 using PCR-denaturing gradient gel electrophoresis (DGGE) and quantitative PCR (qPCR). Four sites were selected across the continental shelf edge: continental shelf water (CSW), Kuroshio branch water (KBW), transition between CSW and KBW (TCSKB) and coastal KBW (CKBW)...
November 16, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/29143054/amidoboranes-of-rubidium-and-caesium-the-last-missing-members-of-the-alkali-metal-amidoborane-family
#7
Rafał Owarzany, Tomasz Jaroń, Piotr J Leszczyński, Karol J Fijalkowski, Wojciech Grochala
We report the synthesis and physicochemical characterization of two ammonia borane derivatives: rubidium amidoborane (RbNH2BH3) and caesium amidoborane (CsNH2BH3). Both compounds undergo solid-solid phase transition upon heating and then evolve pure hydrogen at temperatures lower than 125 °C. The phase transition is clearly seen in the Raman spectra. We present crystal structures of both low- and high-temperature forms of the title compounds which were solved from powder X-ray data.
November 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29142616/scaling-relations-for-acidity-and-reactivity-of-zeolites
#8
Chong Liu, Ionut Tranca, Rutger A van Santen, Emiel J M Hensen, Evgeny A Pidko
Zeolites are widely applied as solid acid catalysts in various technological processes. In this work we have computationally investigated how catalytic reactivity scales with acidity for a range of zeolites with different topologies and chemical compositions. We found that straightforward correlations are limited to zeolites with the same topology. The adsorption energies of bases such as carbon monoxide (CO), acetonitrile (CH3CN), ammonia (NH3), trimethylamine (N(CH3)3), and pyridine (C5H5N) give the same trend of acid strength for FAU zeolites with varying composition...
October 26, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/29141885/a-role-for-bacterial-urease-in-gut-dysbiosis-and-crohn-s-disease
#9
Josephine Ni, Ting-Chin David Shen, Eric Z Chen, Kyle Bittinger, Aubrey Bailey, Manuela Roggiani, Alexandra Sirota-Madi, Elliot S Friedman, Lillian Chau, Andrew Lin, Ilana Nissim, Justin Scott, Abigail Lauder, Christopher Hoffmann, Gloriany Rivas, Lindsey Albenberg, Robert N Baldassano, Jonathan Braun, Ramnik J Xavier, Clary B Clish, Marc Yudkoff, Hongzhe Li, Mark Goulian, Frederic D Bushman, James D Lewis, Gary D Wu
Gut dysbiosis during inflammatory bowel disease involves alterations in the gut microbiota associated with inflammation of the host gut. We used a combination of shotgun metagenomic sequencing and metabolomics to analyze fecal samples from pediatric patients with Crohn's disease and found an association between disease severity, gut dysbiosis, and bacterial production of free amino acids. Nitrogen flux studies using (15)N in mice showed that activity of bacterial urease, an enzyme that releases ammonia by hydrolysis of host urea, led to the transfer of murine host-derived nitrogen to the gut microbiota where it was used for amino acid synthesis...
November 15, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/29141130/enhancement-of-l-threonine-production-through-controlling-sequential-carbon-nitrogen-ratios-during-fermentation
#10
Hyeok-Won Lee, Hee-Suk Lee, Chun-Suk Kim, Jin-Gyeom Lee, Won-Kyo Kim, Eun-Gyo Lee, Hong-Weon Lee
Controlling residual glucose concentration is important for improving productivity in L-threonine fermentation. In this study, we developed a procedure to automatically control the feeding quantity of glucose solution as a function of ammonia-water consumption rate. The feeding ratio (Rc/n) of glucose and ammonia water was pre-determined via a stoichiometric approach, based on glucose-ammonia water consumption rates. In a 5-L fermenter, 102 g/L L-threonine was obtained using our glucose-ammonia water combined feeding strategy, which was then successfully applied in a 500-L fermenter (89g/L)...
November 15, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29141107/metal-transformation-as-a-strategy-for-bacterial-detoxification-of-heavy-metals
#11
Ashraf M M Essa, Mohamed A Al Abboud, Sayeed I Khatib
Microorganisms can modify the chemical and physical characters of metals leading to an alteration in their speciation, mobility, and toxicity. Aqueous heavy metals solutions (Hg, Cd, Pb, Ag, Cu, and Zn) were treated with the volatile metabolic products (VMPs) of Escherichia coli Z3 for 24 h using aerobic bioreactor. The effect of the metals treated with VMPs in comparison to the untreated metals on the growth of E. coli S1 and Staphylococcus aureus S2 (local isolates) was examined. Moreover, the toxic properties of the treated and untreated metals were monitored using minimum inhibitory concentration assay...
November 15, 2017: Journal of Basic Microbiology
https://www.readbyqxmd.com/read/29140643/assessment-of-interventions-to-improve-air-quality-in-a-livestock-building
#12
T Renée Anthony, Anthony Y Yang, Thomas M Peters
This study examined the effectiveness of engineering controls to reduce contaminant concentrations in a swine farrowing room during winter in the U.S. Midwest. Over two winters, changes in air quality were evaluated following installation of a 1700 m3 h-1 (1000 cfm) recirculating ventilation system to provide 5.4 air exchanges per hour. This system incorporated one of two readily available dust control systems, one based on filtration and the other on cyclonic treatment. A second treatment evaluated reductions in carbon dioxide (CO2) associated with replacement of standard, unvented gas-fired heaters with new vented heaters, installed between the two winter test periods...
November 20, 2017: Journal of Agricultural Safety and Health
https://www.readbyqxmd.com/read/29139077/spatiotemporal-patterns-and-source-attribution-of-nitrogen-pollution-in-a-typical-headwater-agricultural-watershed-in-southeastern-china
#13
Wenjun Chen, Bin He, Daniel Nover, Weili Duan, Chuan Luo, Kaiyan Zhao, Wen Chen
Excessive nitrogen (N) discharge from agriculture causes widespread problems in aquatic ecosystems. Knowledge of spatiotemporal patterns and source attribution of N pollution is critical for nutrient management programs but is poorly studied in headwaters with various small water bodies and mini-point pollution sources. Taking a typical small watershed in the low mountains of Southeastern China as an example, N pollution and source attribution were studied for a multipond system around a village using the Hydrological Simulation Program-Fortran (HSPF) model...
November 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29138970/development-of-an-acute-toxicity-test-with-the-tropical-marine-amphipod-parhyale-hawaiensis
#14
Mariana Coletty Artal, Amanda Dos Santos, Theodore Burdick Henry, Gisela de Aragão Umbuzeiro
There is a lack of suitable tropical marine species for ecotoxicity tests. An attractive model organism for ecotoxicology is the marine amphipod Parhyale hawaiensis, which is already a model for genetic and developmental studies. This species is widespread, can tolerate changes in salinity, is easy to handle and is representative of circumtropical regions. The aim of this work was to describe standardized procedures for laboratory husbandry, define conditions for acute toxicity tests, and to provide acute toxicity test results for some reference toxicants...
November 15, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/29138968/mitochondrial-dysfunctions-contribute-to-energy-deficits-in-rodent-model-of-hepatic-encephalopathy
#15
Saurabh Dhanda, Aditya Sunkaria, Avishek Halder, Rajat Sandhir
Perturbations in the cerebral energy metabolism are anticipated to be an important factor by which ammonia may exert its toxic effects on the central nervous system. The present study was designed to investigate the role of impaired mitochondrial functions and cerebral energy metabolism in the development hepatic encephalopathy (HE) induced by of bile duct ligation (BDL). After four weeks of BDL, a significant increase in hepatic hydroxyproline and collagen content was observed which confirmed biliary fibrosis...
November 14, 2017: Metabolic Brain Disease
https://www.readbyqxmd.com/read/29137738/ultrasound-assisted-leaching-of-rare-earths-from-the-weathered-crust-elution-deposited-ore-using-magnesium-sulfate-without-ammonia-nitrogen-pollution
#16
Shaohua Yin, Jiannan Pei, Feng Jiang, Shiwei Li, Jinhui Peng, Libo Zhang, Shaohua Ju, Chandrasekar Srinivasakannan
The in situ leaching process of China's unique ion-adsorption rare earth ores has caused severe environmental damages due to the use of (NH4)2SO4 solution. This study reports that magnesium sulfate (MgSO4) as a leaching agent would replace (NH4)2SO4 by ultrasonically assisted leaching to deal with the ammonia-nitrogen pollution problem and enhance leaching process. At leaching conditions of 3wt% MgSO4 concentration, 3:1L/S ratio and 30min, the total rare earth leaching efficiency reaches 75.5%. Ultrasound-assisted leaching experiments show that the leaching efficiency of rare earths is substantially increased by introducing ultrasound, and nearly completely leached out after two stage leaching process...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29136895/reactive-low-temperature-plasma-ionization-mass-spectrometry-for-the-determination-of-organic-uv-filters-in-personal-care-products
#17
Xuelu Ding, Stefanie Gerbig, Bernhard Spengler, Sabine Schulz
Organic UV filters in personal care products (PCPs) have been persistently reported as a potential threat to human health. In order to guarantee consumers(') safety, the dose of these compounds in PCPs needs to be monitored. Here, a methodology based on reactive low temperature plasma ionization (LTP) mass spectrometry (MS) has been developed for the determination of common organic UV filters in PCPs including benzophenone-3, ethylhexyl dimethyl p-aminobenzoic acid, ethylhexyl methoxycinnamate, 4-methylbenzylidene camphor, octocrylene, and ethylhexyl salicylate...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136857/solid-supported-synergistic-twain-probes-with-aggregation-induced-emission-a-sensing-platform-for-fingerprinting-volatile-amines
#18
Peijun Shi, Jifen Wang, Yadong Zhao, Yuai Duan, Lin Shi, Yue Hou, Jingdan Hou, Wenjun Li, Tianyu Han
Two solid emitters DMA and HBA were synthetized, showing aggregation-induced emission (AIE) phenomenon. Incorporation of electron donor-acceptor (D-A) pairs endows the solid emitters with both charge transfer (CT) state emission and distinct solvatochromic effect. The compounds undergo a rapid interaction with amines followed by the resulting weakened electron withdrawing ability to yield florescent products with either hypochromatic shift or decrease in the emission intensity. DFT calculations on HOMO and LUMO electronic cloud distribution and energy levels have demonstrated that the transition from CT state to locally excited (LE) state is mainly responsible for the spectral changes...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136856/nitrogen-dots-as-reductant-and-stabilizer-for-the-synthesis-of-agnps-n-dots-nanocomposites-for-efficient-surface-enhanced-raman-scattering-detection
#19
Zhenhua Lin, Jiani Yang, Zhijiao Tang, Gongke Li, Yuling Hu
A simple method was developed for the preparation of silver nanoparticles (AgNPs) by using amino-functionalized nitrogen dots (N-dots) as reductant and stabilizer under mild conditions. N-dots were hydrothermal synthesized using 2-azidoimidazole as the precursor in aqueous ammonia. The as prepared N-dots were rich in nitrogen and oxygen-containing functional groups and exhibit strong reducing capacity. Therefore, AgNPs were rapidly synthesized under mild conditions based on N-dots serving as the reducing agent, the reaction time and temperature were 5min and 40°C, respectively...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136546/multi-component-hybrid-soft-ionogels-for-photoluminescence-tuning-and-sensing-organic-solvent-vapors
#20
Jing Ma, Bing Yan
This paper tries to prepare soft ionogels through the carboxyl ion liquid (IM(+)Br(-)) as double chemical linker connecting both Bio-MOF-1 (Zn8(ad)4(BPDC)6O·2Me2NH2, BPDC=biphenyl-4,4'-dicarboxylate, Ad = adeninate) and lanthanide complexes. Among anionic Bio-MOF-1 interacts with IM(+)Br(-) through cation exchange (IM(+)) to form BMOF-IM and lanthanide ions are further introduced through the coordination to the carboxylic group of IM(+) together with Phen (1,10-phenanthroline) as assistant ligand for Ln(3+) (Ln = Eu, Tb or Eu/Tb)...
November 7, 2017: Journal of Colloid and Interface Science
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