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Feng Wang, Baoyu Gao, Qinyan Yue, Fan Bu, Xue Shen
Effects of ozonation and powdered activated carbon on removal of dissolved organic matter (DOM) and disinfection by-product (DBP) in reservoir water were intensively investigated in this study. Both the formation of carbonaceous DBP (C-DBP) and nitrogenous DBP (N-DBP) as well as their speciation were analyzed. Results exhibited that the addition of powdered activated carbon (PAC) greatly improved the removal of aromatic protein. Trihalomethanes (THMs) and haloacetonitriles (HANs) were the dominant species in C-DBP and N-DBP...
June 15, 2017: Environmental Science and Pollution Research International
Asli Celebioglu, Tamer Uyar
Here, we demonstrated the electrospinning of polymer-free nanofibrous webs from inclusion complex (IC) between hydroxypropyl-β-cyclodextrin (HPβCD) and Vitamin E (Vitamin E/HPβCD-IC NF). The inclusion complexation between HPβCD and Vitamin E was prepared by using two different molar ratio (Vitamin E: HPβCD; 1:2 and 1:1), which correspond to theoretical value of ~13% (w/w) and 26% (w/w) loading of Vitamin E in the nanofiber (NF) matrix. After electrospinning and storage, a very high loading of Vitamin E (up to ~11% w/w, with respect to fiber matrix) was preserved in Vitamin E/HPβCD-IC NF...
June 13, 2017: Journal of Agricultural and Food Chemistry
Dominik Belej, Zuzana Jurasekova, Michal Nemergut, Georges Wagnieres, Daniel Jancura, Veronika Huntosova
The interaction between a ruthenium - based water soluble oxygen probe ([Ru(Phen)3](2+), phen - phenanthroline) and human serum albumin (HSA) was investigated with the aim of describing the influence of HSA on the [Ru(Phen)3](2+) luminescence properties. Nowadays, several oxygen sensitive luminescent probes are used to determine the oxygen level in different compartments of living organisms. However, they can interact, depending on their hydrophilic/hydrophobic characters, with various serum proteins, and/or lipids, during their utilization for invivo oxygen measurement...
May 31, 2017: Journal of Inorganic Biochemistry
Guanglei Hou, Moyuan Cao, Cunming Yu, Shuang Zheng, Dianyu Wang, Zhongpeng Zhu, Weining Miao, Ye Tian, Lei Jiang
The reversible switching of water-droplet adhesion on solid surfaces is of great significance for smart devices, such as microfluidics. In this work, we prepared a fast and reversible magnetic controlled switching of water-droplet adhesion surfaces by doping iron powders in soft PDMS. The water adhesion is adjusted by magnetic field induced structure changes, avoiding complex chemical or physical surface design. The regulation process is so convenient that only tens of milliseconds is needed. The on-site responsive mechanism extends its usage in unusual curved surfaces...
June 9, 2017: ACS Applied Materials & Interfaces
Fábio F Roxo, Nathan K Lujan, Victor A Tagliacollo, Brandon T Waltz, Gabriel S C Silva, Claudio Oliveira, James S Albert
Identifying habitat characteristics that accelerate organismal evolution is essential to understanding both the origins of life on Earth and the ecosystem properties that are most critical to maintaining life into the future. Searching for these characteristics on a large scale has only recently become possible via advances in phylogenetic reconstruction, time-calibration, and comparative analyses. In this study, we combine these tools with habitat and phenotype data for 105 species in a clade of Neotropical suckermouth catfishes commonly known as cascudinhos...
2017: PloS One
Rong Liu, Yanyong Wang, Dongdong Liu, Yuqin Zou, Shuangyin Wang
An earth-abundant and highly efficient electrocatalyst is essential for oxygen evolution reaction (OER) due to its poor kinetics. Layered double hydroxide (LDH)-based nanomaterials are considered as promising electrocatalysts for OER. However, the stacking structure of LDHs limits the exposure of the active sites. Therefore, the exfoliation is necessary to expose more active sites. In addition, the defect engineering is proved to be an efficient strategy to enhance the performance of OER electrocatalysts. For the first time, this study prepares ultrathin CoFe LDHs nanosheets with multivacancies as OER electrocatalysts by water-plasma-enabled exfoliation...
June 7, 2017: Advanced Materials
Man Yang, Chunyan Liu, Kongshuang Zhao
The dielectric behavior of thermo-sensitive poly-(N-isopropylacrylamide) (PNIPAM) microgel with three different concentrations was investigated for the frequencies ranging from 40 Hz to 110 MHz as a function of temperature from 10 to 60 °C. Two remarkable and temperature-dependent relaxation processes were observed. The slow relaxation originates from the segmental motion over the whole temperature range. The fast relaxation is due to the fluctuation of counterions below the lower critical solution temperature (LCST) and the interfacial polarization above the LCST...
June 14, 2017: Physical Chemistry Chemical Physics: PCCP
Claudia Oellig
Ergot alkaloids are generally determined by high-performance liquid chromatography (HPLC) coupled to fluorescence detection (FLD) or mass selective detection, analyzing the individual compounds. However, fast and easy screening methods for the determination of the total ergot alkaloid content are more suitable, since for monitoring only the sum of the alkaloids is relevant. The herein presented screening uses lysergic acid amide (LSA) as chemical marker, formed from ergopeptine alkaloids, and ergometrine for the determination of the total ergot alkaloids in rye with high-performance thin-layer chromatography-fluorescence detection (HPTLC-FLD)...
May 24, 2017: Journal of Chromatography. A
Antonio López, Clara Coscollà, Vicent Yusà, Sergio Armenta, Miguel de la Guardia, Francesc A Esteve-Turrillas
A hard cap espresso extraction procedure has been developed to recover airborne pesticides in particulate matter trapped in filters. This extraction step was made for 20s at 72°C and 19bar using 50mL of 20% (v/v) acetonitrile in water. After that, based on NaCl salting out, extracts were concentrated 22 times and analysed by ultra-high performance liquid chromatography - high resolution mass spectrometry. 35 pesticides were evaluated, as a proof of concept, being validated the whole methodology and compared the extraction method with that based on microwave assisted extraction for 20min...
May 18, 2017: Journal of Chromatography. A
Inmaculada de la Calle, Mathieu Menta, Marlène Klein, Fabienne Séby
Cosmetics are part of the daily life of most of the people. Thus, a complete characterization of the products we applied in our skin is necessary. In this work, an analytical investigation of a wide variety of cosmetics from the point of view of total element content and metallic nanoparticles (NPs) has been performed. Firstly, we analyzed the total element content by ICP-MS and ICP-OES after acid digestion as an assessment of the presence of metal impurities. Prohibited elements in cosmetics, according to the European Commission regulation No 1223/2009, were not detected, and only elements mentioned in the label were found (e...
August 15, 2017: Talanta
Zahid Hussain, Hae Won Kim, Cheal Wung Huh, Young Ju Lee, Hyojin Park
Functional dyspepsia (FD) and irritable bowel syndrome (IBS) are common gastrointestinal (GI) diseases; however, there is frequent overlap between FD and IBS patients. Emerging evidence links the activation of corticotropin releasing factor (CRF) receptors with stress-related alterations of gastric and colonic motor function. Therefore, we investigated the effect of peripheral CRF peptide and water avoidance stress (WAS) on upper and lower GI transit in guinea pigs. Dosages 1, 3, and 10 μg/kg of CRF were injected intraperitoneally (IP) in fasted guinea pigs 30 minutes prior to the intragastric administration of charcoal mix to measure upper GI transit...
July 2017: Yonsei Medical Journal
Amarendra Dhar Dwivedi, Rega Permana, Jitendra Pal Singh, Hakwon Yoon, Keun Hwa Chae, Yoon-Seok Chang, Dong Soo Hwang
Tunicate, a filter-feeder in seawater, is able to accumulate high amount of metals using intracellular polymer matrices. The woven pyrogallol structures of tunichrome, a small peptide contained in tunicate's blood cells, is believed to be responsible for selective metal sequestration in tunicates from seawater. However, the intriguing tunichrome matrix is difficult both to harvest from the tunicate and to synthesize massively due to the extreme oxidation sensitivity of the pyrogallol moiety which limits the study scope...
June 1, 2017: ACS Applied Materials & Interfaces
Callisia N Clarke, Haesun Choi, Ping Hou, Catherine H Davis, Jingfei Ma, Asif Rashid, Jean-Nicolas Vauthey, Thomas A Aloia
BACKGROUND: The obesity epidemic has significantly increased the incidence and severity of hepatic steatosis in liver surgery patients and liver donors, potentially impacting postoperative liver regeneration and function. Development of a non-invasive means to quantify hepatic steatosis would facilitate selection of candidates for liver resection and transplant donation. METHODS: An IRB-approved protocol prospectively enrolled 28 patients with liver tumors requiring hepatic resection...
May 17, 2017: HPB: the Official Journal of the International Hepato Pancreato Biliary Association
Lenka Javorska, Lenka Kujovska Krcmova, Petr Solich, Milan Kaska
Management of the therapy of life-threatening bacterial infection is extremely based on an optimal antibiotic treatment. Achieving the correct vancomycin dosage in blood and target tissues can be complicated in special situations, e.g., where large fluid sequestration and/or acute renal failure occur. A UHPLC-MS/MS method operating in electrospray (ESI) positive ion mode was applied for the determination of vancomycin in serum, urine and peritoneal/pleural effusion. Sample pretreatment was composed of dilution and simple protein precipitation where only a small volume (50μL) of serum, urine or peritoneal/pleural effusion was required...
May 2, 2017: Journal of Pharmaceutical and Biomedical Analysis
R Gregor Weiß, Piotr Setny, Joachim Dzubiella
We investigate how to tune the rate of hydrophobic ligand-receptor association due to the role of solvent in adjustable receptor pockets by explicit-water molecular dynamics (MD) simulations. Our model considers the binding of a spherical ligand (key/guest) to a concave surface recess in a nonpolar wall as receptor (lock/host). We systematically modify the receptor's physicochemical properties in terms of geometry and dispersion attraction which, in turn, alter the water occupancy and fluctuations within the pocket...
May 31, 2017: Journal of Chemical Theory and Computation
Haoming Bao, Hongwen Zhang, Guangqiang Liu, Yue Li, Weiping Cai
A very simple route is developed for fast fabrication of nanosized amorphous titanium dioxide (TiO2) hollow spheres (THPs) just via dropping the pure four titanium chloride (TiCl4) liquid droplets into deionized water at around room temperature. The THPs, at around 80 nm in mean diameter, can be formed within a few seconds after dropping TiCl4 droplets into water. The shell layers of the obtained THPs are amorphous and porous in structure with a porosity of 58-80% and show a linear increase in thickness with the size of THPs...
June 6, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Jongju Yun, Fakhre Alam Khan, Seunghyun Baik
Membrane separation of oil and water with high purity and high permeability is of great interest in environmental and industrial processes. However, membranes with fixed wettability can separate only one type of surfactant-stabilized emulsion (water-in-oil or oil-in-water). Here, we report on Janus graphene oxide (J-GO) sponges for high purity and high permeability separation of both water-in-oil and oil-in-water emulsions. Millimeter-scale reduced GO sponges with a controlled pore size (11.2 or 94.1 μm) are synthesized by freeze drying, and the wettability is further controlled by fluorine (hydrophobic/oleophilic in air) or oxygen (hydrophilic/oleophilic in air) functionalization...
May 8, 2017: ACS Applied Materials & Interfaces
Yong Hoon Kim, Seongjin Hong, Yong Sik Song, Hyojin Lee, Hae-Cheol Kim, Jongseong Ryu, Jinsoon Park, Bong-Oh Kwon, Chang-Hee Lee, Jong Seong Khim
In order to evaluate water quality and biological productivity, observation data sets were collected and analyzed in Yeongsan River Estuary, Korea. We also set up a numerical model to resolve hydrodynamics and fate of water quality variables in the system. Results show that most of nutrients loading are trapped in the lake and higher concentrations of nutrients and organic matters (OM) are present only inside of the artificial sea dike. There exist episodial discharges at the dam, which coincide mostly with rainfall events during summer monsoon periods...
April 22, 2017: Chemosphere
Sergei Petrovskii, Yadigar Sekerci, Ezio Venturino
It is estimated that more than a half of the total atmospheric oxygen is produced in the oceans due to the photosynthetic activity of phytoplankton. Any significant decrease in the net oxygen production by phytoplankton is therefore likely to result in the depletion of atmospheric oxygen and in a global mass mortality of animals and humans. In its turn, the rate of oxygen production is known to depend on water temperature and hence can be affected by the global warming. We address this problem theoretically by considering a model of a coupled plankton-oxygen dynamics where the rate of oxygen production slowly changes with time to account for the ocean warming...
April 27, 2017: Journal of Theoretical Biology
Jérôme Morinière, Lars Hendrich, Michael Balke, Arne J Beermann, Tobias König, Monika Hess, Stefan Koch, Reinhard Müller, Florian Leese, Paul D N Hebert, Axel Hausmann, Christoph F Schubart, Gerhard Haszprunar
Mayflies, stoneflies and caddisflies (Ephemeroptera, Plecoptera and Trichoptera) are prominent representatives of aquatic macroinvertebrates, commonly used as indicator organisms for water quality and ecosystem assessments. However, unambiguous morphological identification of EPT species, especially their immature life stages, is a challenging, yet fundamental task. However, a comprehensive DNA barcode library based upon taxonomically well-curated specimens can overcome the problematic identification. Once available, this library will support the implementation of fast, cost-efficient, and reliable DNA-based identifications and assessments of ecological status...
April 27, 2017: Molecular Ecology Resources
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