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Yuyang Long, Jing Xu, Dongsheng Shen, Yao Du, Huajun Feng
Leachate membrane concentrates containing high concentrations of organics and trace toxic compounds pose a major threat to the environment, and their treatment is an urgent issue. In this work, various coagulants were used to treat leachate membrane concentrates. Appropriate pH values for treatments with FeCl2, FeSO4, polyaluminum chloride, and FeCl3 were 3, 5, 5, and 4, respectively. FeCl3 achieved the highest total organic carbon (TOC) removal efficiency. The effect of the various anions in ferric coagulants [FeCl3, Fe2(SO4)3, and Fe(NO3)3] on the TOC removal efficiency was negligible...
October 17, 2016: Chemosphere
Xianyu Song, Shuangliang Zhao, Shenwen Fang, Yongzhang Ma, Ming Duan
The dissipative particle dynamics (DPD) method is used to investigate the adsorption behavior of PEO-PPO-PEO triblock copolymers at the liquid/solid interface. The effect of molecular architecture on the self-assembled monolayer adsorption of PEO-PPO-PEO triblock copolymers on hydrophobic surfaces is elucidated by adsorption process, film properties, adsorption morphologies, respectively. The adsorption thicknesses on hydrophobic surfaces and diffusion coefficient as well as aggregation number of Pluronic copolymers in aqueous solution observed in our simulations agree well with previous experimental and numerical observations...
October 20, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
(no author information available yet)
No abstract text is available yet for this article.
October 19, 2016: Nature
Monica R P Rao, Chaitanya Shirsath
Efavirenz is a non-nucleoside reverse transcriptase inhibitor which is chronically prescribed for HIV patients. However, it exhibits solubility-limited bioavailability. Aim of this work was to enhance the solubility and dissolution of the Biopharmaceutical Classification System (BCS) class II drug efavirenz, using beta-cyclodextrin-based nanosponges. Nanosponges have high drug loading capacity and are effective for solubility enhancement. Beta-cyclodextrin was crosslinked with carbonates in different ratios to prepare nanosponges...
October 18, 2016: AAPS PharmSciTech
Michael A Mole, Shaun Rodrigues DÁraujo, Rudi J van Aarde, Duncan Mitchell, Andrea Fuller
Most of southern Africa's elephants inhabit environments where environmental temperatures exceed body temperature, but we do not know how elephants respond to such environments. We evaluated the relationships between apparent thermoregulatory behaviour and environmental, skin and core temperatures for tame savanna elephants (Loxodonta africana) that were free-ranging in the hot parts of the day, in their natural environment. Environmental temperature dictated elephant behaviour within a day, with potential consequences for fine-scale habitat selection, space use and foraging...
2016: Conservation Physiology
Jeanette M Johnstone, Chelsea Roake, Ifrah Sheikh, Ashlie Mole, Joel T Nigg, Barry Oken
Adolescents are in a high-risk period developmentally, in terms of susceptibility to stress. A mindfulness intervention represents a potentially useful strategy for developing cognitive and emotion regulation skills associated with successful stress coping. Mindfulness strategies have been used successfully for emotional coping in adults, but are not as well studied in youth. This article details a novel proposal for the design of an 8-week randomized study to evaluate a high school-based mindfulness curriculum delivered as part of a two semester health class...
December 15, 2016: Contemporary Clinical Trials Communications
Robert W Newberry, Ronald T Raines
Current limitations in de novo protein structure prediction and design suggest an incomplete understanding of the interactions that govern protein folding. Here we demonstrate that previously unappreciated hydrogen bonds occur within proteins between the amide proton and carbonyl oxygen of the same residue. Quantum calculations, infrared spectroscopy, and nuclear magnetic resonance spectroscopy show that these interactions share hallmark features of canonical hydrogen bonds. Biophysical analyses demonstrate that selective attenuation or enhancement of these C5 hydrogen bonds affects the stability of synthetic β-sheets...
October 17, 2016: Nature Chemical Biology
Junhui Zhou, Yidi Wu, Changrong Wang, Qiang Cheng, Shangcong Han, Xiaoxia Wang, Jianhua Zhang, Liandong Deng, Deyao Zhao, Lili Du, Huiqing Cao, Zicai Liang, Yuanyu Huang, Anjie Dong
The extremely low efficient cytosolic release of the internalized siRNA has emerged recently as a central issue for siRNA delivery, while there is a lack of guidelines to facilitate the cytosolic release of internalized siRNA. To address these concerns, we studied the contribution of the pH-sensitive inner core on handling the cytosolic release of siRNA delivered by a series of PG-P(DPAx-co-DMAEMAy)-PCB amphiphilic polycation nanomicelles (GDDC-Ms) with extremely low internalization (<1/4 of lipofactamine 2000 (Lipo2000))...
October 17, 2016: Nano Letters
Elisabeth Mansfield, Ian H Bell, Stephanie L Outcalt
To develop comprehensive models for multicomponent natural gas mixtures, it is necessary to have binary interaction parameters for each of the pairs of constituent fluids that form the mixture. The determination of accurate mixture interaction parameters depends on reliably collected experimental data. In this work, we have carried out an experimental campaign to measure the bubble-point pressures of mixtures of n-propane and n-decane, a mixture that has been thus far poorly studied with only four existing data sets...
July 14, 2016: Journal of Chemical and Engineering Data
Sphoorthi Jinna, Jane M Grant-Kels, Jerry Graff
No abstract text is available yet for this article.
November 2016: Journal of the American Academy of Dermatology
Yoshihito Iijima, Hirohiko Akiyama, Yuki Nakajima, Hiroyasu Kinoshita, Iwao Mikami, Hidetaka Uramoto, Tomomi Hirata
INTRODUCTION: Recently, the opportunity to encounter lung metastasis from choriocarcinoma has become very rare for thoracic surgeons, since chemotherapy works very well and the operative indications for lung metastasis are limited. PRESENTATION OF CASE: A 45-year-old woman with a past history of hydatidiform mole six years previously was found to have a nodulous chest shadow in the right middle lung field on a chest radiography. She was also suspected of having an ovarian tumor and underwent a total abdominal hysterectomy and bilateral salpingo-oophorectomy...
September 30, 2016: International Journal of Surgery Case Reports
Edoardo Torti, Stefano Protti, Daniele Merli, Daniele Dondi, Maurizio Fagnoni
The photochemical behavior of differently substituted N-arylsulfonimides was investigated. Homolysis of the S-N bond took place as the exclusive path from the singlet state to afford both N-arylsulfonamides and photo-Fries adducts, the amount of which depended on reaction conditions and aromatic substituents. Sulfinic and sulfonic acids were released upon irradiation under deaerated and oxygenated conditions, respectively. The nature of the excited states and intermediates involved were proved by laser flash photolysis and EPR experiments...
October 14, 2016: Chemistry: a European Journal
Wei Zhou, Jihui Gao, Haiqian Zhao, Xiaoxiao Meng, Shaohua Wu
The reaction between Fe(2+) and H2O2 generates ·OH, which is capable of degrading organic pollutants. However, the weak conversion from Fe(3+) back to Fe(2+) limits its continuous reaction. Here, difference between Fenton system and modified Fenton system (i.e., Hydroquinone-Fenton, 1,4-Bezoquinone-Fenton, NH2OH-Fenton) for the regeneration of Fe(2+) was analyzed. UV-vis spectrometer and redox potential measurements were used to detect Fe(2+) concentration. HPLC was used to detect concentration of ·OH. Results indicated that, different from traditional Fenton system, Fe(2+) could be better regenerated in modified Fenton system...
October 13, 2016: Environmental Technology
Damir Omerbašić, Ewan St J Smith, Mirko Moroni, Johanna Homfeld, Ole Eigenbrod, Nigel C Bennett, Jane Reznick, Chris G Faulkes, Matthias Selbach, Gary R Lewin
The naked mole-rat is a subterranean rodent lacking several pain behaviors found in humans, rats, and mice. For example, nerve growth factor (NGF), an important mediator of pain sensitization, fails to produce thermal hyperalgesia in naked mole-rats. The sensitization of capsaicin-sensitive TRPV1 ion channels is necessary for NGF-induced hyperalgesia, but naked mole-rats have fully functional TRPV1 channels. We show that exposing isolated naked mole-rat nociceptors to NGF does not sensitize TRPV1. However, the naked mole-rat NGF receptor TrkA displays a reduced ability to engage signal transduction pathways that sensitize TRPV1...
October 11, 2016: Cell Reports
Wei Jiang, Jin Yang, Ying-Ying Liu, Shu-Yan Song, Jian-Fang Ma
A porous rtl metal-organic framework (MOF) [Mn5 L(H2 O)6 ⋅(DMA)2 ]⋅5DMA⋅4C2 H5 OH (1⋅Mn) (H10 L=5,10,15,20-tetra(4-(3,5-dicarboxylphenoxy)phenyl)porphyrin; DMA=N,N'-dimethylacetamide) was synthesized by employing a new porphyrin-based octacarboxylic acid ligand. 1⋅Mn exhibits high Mn(II) density in the porous framework, providing it great Lewis-acid heterogeneous catalytic capability for the cycloaddition of CO2 with epoxides. Strikingly, 1⋅Mn features excellent catalytic activity to the cycloaddition of CO2 to epoxides, with a remarkable initial turnover frequency 400 per mole of catalyst per hour at 20 atm...
October 12, 2016: Chemistry: a European Journal
Joele Viallon, Philippe Moussay, Edgar Flores, Robert Ian Wielgosz
Elevated values of ground-level ozone damage health, vegetation and building materials and are the subject of air quality regulations. Levels are monitored by networks using mostly Ultraviolet (UV) absorption instruments, with traceability to Standard Reference Photometers, relying on the UV absorption of ozone at the 253.65 nm line of mercury. We have re-determined the ozone cross-section at this wavelength based on gas phase titration (GPT) measurements. This is a well-known chemical method using the reaction of ozone (O3) with nitrogen monoxide (NO) resulting in nitrogen dioxide (NO2) and oxygen (O2)...
October 11, 2016: Analytical Chemistry
Murray B McBride, Meredith Frenchmeyer, Sabrina E Kelch, Ludmilla Aristilde
Calcium-oxalates (Ca-Ox), which are widely produced by microorganisms and plants, are ubiquitous and persistent biominerals in the biosphere. We investigated the potential trapping of two phytotoxic metals, cadmium (Cd) and zinc (Zn) by isomorphous substitution into the crystalline structure of Ca-Ox precipitated over a wide range of Cd(2+)/Ca(2+) or Zn(2+)/Ca(2+) ratio in solution. We employed atomic absorption spectroscopy, X-ray diffraction (XRD), and optical microscopy to evaluate our hypotheses that favorable solid-solution conditions and structural framework of crystal habits promote selective metal trapping within Ca-Ox precipitates...
September 30, 2016: Journal of Colloid and Interface Science
Marta Arczewska, Grzegorz Czernel, Mariusz Gagos
In this work, a comparative study on the effect of an antibiotic amphotericin B (AmB) and its copper complex on the multicomponent monolayers imitating the outer leaflet of human erythrocyte membrane has been performed by means of the Langmuir monolayer technique. The properties of mixed films were analysed by thermodynamic description of the interactions between the molecules, complemented with the morphology of monolayers established by Brewster Angle Microscopy (BAM). The results revealed differences in the molecular organisation of the two antibiotic forms at the air/water interface, which were explained by the different spatial structure of the complex...
October 10, 2016: Journal of Physical Chemistry. B
Haeri Lee, Eunkyung Choi, Tae Hwan Noh, Ok-Sang Jung
The palladium(ii) cyclophane systems, constructed by previously reported proof-of-concept self-assembly, represent a crucial landmark in the field of effective and recyclable scavenging of triiodide (I3(-)) in the photo-cyclopropanation of alkenes with CH2I2. The scavenger's driving force behind photo-cyclopropanation is the efficient in situ crystallization of triiodide-exchanged species. The exact quantitative photoreaction yields according to the mole ratios of the cyclophane system are impressive. The recycling behavior can be ascribed to the rigidity and stability of the four-layered tripalladium(ii)cyclophane...
September 30, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
Benjamin S Truscott, Mark W Kelly, Katie J Potter, Michael N R Ashfold, Yuri A Mankelevich
We report a combined experimental and modelling study of microwave-activated dilute CH4/N2/H2 plasmas, as used for chemical vapour deposition (CVD) of diamond, under very similar conditions to previous studies of CH4/H2, CH4/H2/Ar and N2/H2 gas mixtures. Using cavity ring-down spectroscopy, absolute column densities of CH(X, v=0), CN(X, v=0) and NH(X, v=0) radicals in the hot plasma have been determined as functions of height, z, source gas mixing ratio, total gas pressure, p, and input power, P. Optical emission spectroscopy has been used to investigate, with respect to the same variables, the relative number densities of electronically excited species, namely H atoms, CH, C2, CN and NH radicals, and triplet N2 molecules...
October 8, 2016: Journal of Physical Chemistry. A
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