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https://www.readbyqxmd.com/read/28212513/simultaneous-removal-of-no-and-hg-0-over-ce-cu-modified-v2o5-tio2-based-commercial-scr-catalysts
#1
Guilong Chi, Boxiong Shen, Ranran Yu, Chuan He, Xiao Zhang
A series of novel Ce-Cu modified V2O5/TiO2 based commercial SCR catalysts were prepared via ultrasonic-assisted impregnation method for simultaneous removal of NO and elemental mercury (Hg(0)). Nitrogen adsorption, X-ray diffraction (XRD), temperature programmed reduction of H2 (H2-TPR) and X-ray photoelectron spectroscopy (XPS) were used to characterize the catalysts. 7% Ce-1% Cu/SCR catalyst exhibited the highest NO conversion efficiency (>97%) at 200-400°C, as well as the best Hg(0) oxidation activity (>75%) at 150-350°C among all the catalysts...
February 12, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28212489/direct-single-enzyme-biomineralization-of-catalytically-active-ceria-and-ceria-zirconia-nanocrystals
#2
Christopher D Curran, Li Lu, Yue Jia, Christopher J Kiely, Bryan W Berger, Steven McIntosh
Biomineralization is an intriguing approach to the synthesis of functional inorganic materials for energy applications whereby biological systems are engineered to mineralize inorganic materials and control their structure over multiple length scales under mild reaction conditions. Herein we demonstrate a single enzyme mediated biomineralization route to synthesize crystalline, catalytically active, quantum confined ceria (CeO2-x) and ceria-zirconia (Ce1-yZryO2-x) nanocrystals for application as environmental catalysts...
February 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28212432/genetically-encoded-ratiometric-fluorescent-thermometer-with-wide-range-and-rapid-response
#3
Masahiro Nakano, Yoshiyuki Arai, Ippei Kotera, Kohki Okabe, Yasuhiro Kamei, Takeharu Nagai
Temperature is a fundamental physical parameter that plays an important role in biological reactions and events. Although thermometers developed previously have been used to investigate several important phenomena, such as heterogeneous temperature distribution in a single living cell and heat generation in mitochondria, the development of a thermometer with a sensitivity over a wide temperature range and rapid response is still desired to quantify temperature change in not only homeotherms but also poikilotherms from the cellular level to in vivo...
2017: PloS One
https://www.readbyqxmd.com/read/28212409/pathogenic-waterborne-free-living-amoebae-an-update-from-selected-southeast-asian-countries
#4
Mohamad Azlan Abdul Majid, Tooba Mahboob, Brandon G J Mong, Narong Jaturas, Reena Leeba Richard, Tan Tian-Chye, Anusorn Phimphila, Panomphanh Mahaphonh, Kyaw Nyein Aye, Wai Lynn Aung, Joon Chuah, Alan D Ziegler, Atipat Yasiri, Nongyao Sawangjaroen, Yvonne A L Lim, Veeranoot Nissapatorn
Data on the distribution of free-living amoebae is still lacking especially in Southeast Asian region. The aquatic environment revealed a high occurrence of free-living amoebae (FLA) due to its suitable condition and availability of food source, which subsequently causes infection to humans. A total of 94 water samples consisted of both treated and untreated from Laos (31), Myanmar (42), and Singapore (21) were investigated for the presence of pathogenic FLA. Each water sample was filtered and cultured onto non-nutrient agar seeded with live suspension of Escherichia coli and incubated at room temperature...
2017: PloS One
https://www.readbyqxmd.com/read/28212399/instrument-design-and-protocol-for-the-study-of-light-controlled-processes-in-aquatic-organisms-and-its-application-to-examine-the-effect-of-infrared-light-on-zebrafish
#5
Marcus P S Dekens, Nicholas S Foulkes, Kristin Tessmar-Raible
The acquisition of reliable data strongly depends on experimental design. When studying the effects of light on processes such as behaviour and physiology it is crucial to maintain all environmental conditions constant apart from the one under study. Furthermore, the precise values of the environmental factors applied during the experiment should be known. Although seemingly obvious, these conditions are often not met when the effects of light are being studied. Here, we document and discuss the wavelengths and light intensities of natural and artificial light sources...
2017: PloS One
https://www.readbyqxmd.com/read/28212336/the-influence-of-anion-shape-on-the-electrical-double-layer-microstructure-and-capacitance-of-ionic-liquids-based-supercapacitors-by-molecular-simulations
#6
Ming Chen, Song Li, Guang Feng
Room-temperature ionic liquids (RTILs) are an emerging class of electrolytes for supercapacitors. In this work, we investigate the effects of different supercapacitor models and anion shape on the electrical double layers (EDLs) of two different RTILs: 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([Emim][Tf₂N]) and 1-ethyl-3-methylimidazolium 2-(cyano)pyrrolide ([Emim][CNPyr]) by molecular dynamics (MD) simulation. The EDL microstructure is represented by number densities of cations and anions, and the potential drop near neutral and charged electrodes reveal that the supercapacitor model with a single electrode has the same EDL structure as the model with two opposite electrodes...
February 16, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28212319/a-validated-stability-indicating-hplc-method-for-simultaneous-determination-of-amoxicillin-and-enrofloxacin-combination-in-an-injectable-suspension
#7
Nidal Batrawi, Shorouq Wahdan, Fuad Al-Rimawi
The combination of amoxicillin and enrofloxacin is a well-known mixture of veterinary drugs; it is used for the treatment of Gram-positive and Gram-negative bacteria. In the scientific literature, there is no high-performance liquid chromatography (HPLC)-UV method for the simultaneous determination of this combination. The objective of this work is to develop and validate an HPLC method for the determination of this combination. In this regard, a new, simple and efficient reversed-phase HPLC method for simultaneous qualitative and quantitative determination of amoxicillin and enrofloxacin, in an injectable preparation with a mixture of inactive excipients, has been developed and validated...
February 16, 2017: Scientia Pharmaceutica
https://www.readbyqxmd.com/read/28212300/amorphous-amorphous-phase-separation-in-api-polymer-formulations
#8
Christian Luebbert, Fabian Huxoll, Gabriele Sadowski
The long-term stability of pharmaceutical formulations of poorly-soluble drugs in polymers determines their bioavailability and therapeutic applicability. However, these formulations do not only often tend to crystallize during storage, but also tend to undergo unwanted amorphous-amorphous phase separations (APS). Whereas the crystallization behavior of APIs in polymers has been measured and modeled during the last years, the APS phenomenon is still poorly understood. In this study, the crystallization behavior, APS, and glass-transition temperatures formulations of ibuprofen and felodipine in polymeric PLGA excipients exhibiting different ratios of lactic acid and glycolic acid monomers in the PLGA chain were investigated by means of hot-stage microscopy and DSC...
February 15, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28212272/design-of-novel-fbg-based-sensor-of-differential-pressure-with-magnetic-transfer
#9
Guohui Lyu, Guohang Che, Junqing Li, Xu Jiang, Keda Wang, Yueqiang Han, Laixu Gao
In this paper, a differential pressure sensor with magnetic transfer is proposed, in which the non-electric measurement based on the fiber Bragg grating (FBG) with the position limiting mechanism is implemented without the direct contact of the sensing unit with the measuring fluid. The test shows that the designed sensor is effective for measuring differential pressure in the range of 0~10 kPa with a sensitivity of 0.0112 nm/kPa, which can be used in environments with high temperature, strong corrosion and high overload measurements...
February 15, 2017: Sensors
https://www.readbyqxmd.com/read/28212268/optical-sensor-of-thermal-gas-flow-based-on-fiber-bragg-grating
#10
Xu Jiang, Keda Wang, Junqing Li, Hui Zhan, Zhenan Song, Guohang Che, Guohui Lyu
This paper aims at solving the problem of explosion proof in measurement of thermal gas flow using electronic sensor by presenting a new type of flow sensor by optical fiber heating. A measuring unit based on fiber Bragg grating (FBG) for fluid temperature and a unit for heat dissipation are designed to replace the traditional electronic sensors. The light in C band from the amplified spontaneous emission (ASE) light source is split, with one part used to heat the absorbing coating and the other part used in the signal processing unit...
February 15, 2017: Sensors
https://www.readbyqxmd.com/read/28212040/synthesis-and-speciation-dependent-properties-of-a-multimetallic-model-complex-of-nisod-that-exhibits-unique-hydrogen-bonding
#11
Ramsey A Steiner, Stephen P Dzul, Timothy L Stemmler, Todd C Harrop
The complex Na3[{Ni(II)(nmp)}3S3BTA(alk))] (1) (nmp(2-) = deprotonated form of N-(2-mercaptoethyl)picolinamide; H3S3BTA(alk) = N(1),N(3),N(5)-tris(2-mercaptoethyl)benzene-1,3,5-tricarboxamide, where H = dissociable protons), supported by the thiolate-benzenetricarboxamide scaffold (S3BTA(alk)), has been synthesized as a trimetallic model of nickel-containing superoxide dismutase (NiSOD). X-ray absorption spectroscopy (XAS) and (1)H NMR measurements on 1 indicate that the Ni(II) centers are square-planar with N2S2 coordination, and Ni-N and Ni-S distances of 1...
February 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28212034/observation-of-the-global-dynamic-collectivity-of-a-hydration-shell-around-apomyoglobin
#12
Yangzhong Qin, Luyuan Zhang, Lijuan Wang, Dongping Zhong
Protein surface hydration is critical to its structural properties and biological activities. However, it is still unknown whether the hydration shell is intrinsically connected and how its fluctuations dynamically interact with protein motions. Here, by selecting five site-specific locations with distinctly different environments around apomyoglobin surface, we used a tryptophan scan with femtosecond fluorescence spectroscopy and simultaneously detected hydration-water dynamics and tryptophan sidechain relaxations with temperature dependence...
February 17, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28212033/surface-induced-changes-in-the-thermochromic-transformation-of-an-ionic-liquid-cobalt-thiocyanate-complex
#13
Benjamin May, Michael Hönle, Bettina Heller, Francesco Greco, Radha Gobinda Bhuin, Hans-Peter Steinrück, Florian Maier
We demonstrate that a thermodynamic complex equilibrium within an ionic liquid film can be significantly influenced by the presence of the liquid-vacuum interface. Using surface sensitive X-ray photoelectron spectroscopy, we find that the temperature-driven transition from the blue-colored tetrahedral [Co(II)(NCS)4](2-) to the red-colored octahedral [Co(II)(NCS)6](4-) complex occurs within the outermost nanometers already around +4 °C as compared to -25 °C in the bulk. This thermochromic transformation in the near-surface region goes along with a loss in preferential surface orientation of free [SCN](-) anions and with a pronounced decrease in the complex density; both effects are attributed to the formation of a weakly-bound solvation shell around the [Co(II)(NCS)6](4-) anion leading to an effective complex dilution...
February 17, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28212030/revisiting-silicalite-1-nucleation-in-clear-solution-by-electrochemical-impedance-spectroscopy
#14
Gert Brabants, Maxim Hubin, Erwin Konrad Reichel, Bernhard Jakoby, Eric Breynaert, Francis Taulelle, Johan A Martens, Christine E A Kirschhock
EIS was used to detect and investigate nucleation in silicalite-1 clear solutions. Whereas zeolite nucleation was previously assumed to be a step event, inducing a sharp discontinuity around a Si/OH ratio of 1, complex bulk conductivity measurements at elevated temperatures reveal a gradual decay of the conductivity with increased silicon concentrations. Inverse Laplace transformation of the complex conductivity allows to observe the chemical exchange phenomena governing nano-aggregate formation. At low temperatures, the fast exchange between dissociated ions and ion pairs leads to a gradual decay of the conductivity with increasing silicon content...
February 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28212027/ferromagnetic-coupling-in-the-heterospin-bis-catecholato-manganese-iv-complex-with-pyridine-substituted-by-nitronyl-nitroxide
#15
Michael P Bubnov, Irina A Teplova, Eugenia A Kopylova, Konstantin A Kozhanov, Artem S Bogomyakov, Marina V Petrova, Vitaly A Morozov, Victor I Ovcharenko, Vladimir K Cherkasov
A new bis(3,6-di-tert-butyl-catecholato)manganese complex with two 4-NIT-Py ligands was synthesized and characterized [4-NIT-Py = pyridine substituted at position 4 with nitronyl-nitroxide radical, 2-(pyridin-4-yl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl]. X-ray diffraction indicated an octahedral environment of the manganese atom with a trans arrangement of ligands. Bonds lengths in the inner coordination core of the metal and in the chelate cycles that are representative of the charge distribution between the metal and ligands displayed a Mn(IV)(Cat(2-))2 charge distribution...
February 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28212018/derivation-of-hydroperoxyl-radical-ho2-levels-at-an-urban-site-via-measurement-of-pernitric-acid-ho2no2-by-iodide-chemical-ionization-mass-spectrometry-i-cims
#16
Dexian Chen, L Gregory Huey, David J Tanner, Jianfeng Li, Nga Lee Ng, Yuhang Wang
Hydroperoxyl radical (HO2) is a key species to atmospheric chemistry. At warm temperatures, the hydroperoxyl radical (HO2) and NO2 come to a rapid steady state with pernitric acid (HO2NO2). This paper presents the derivation of HO2 from observations of HO2NO2 and NO2 in metropolitan Atlanta, US in winter 2014 and summer 2015. HO2 was observed to have a diurnal cycle with morning concentrations suppressed by high NO from the traffic. At night, derived HO2 levels were nonzero and exhibited correlations with O3 and NO3, consistent with previous studies that ozonolysis and oxidation by NO3 are sources of nighttime HO2...
February 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28212017/increased-electron-accepting-and-decreased-electron-donating-capacities-of-soil-humic-substances-in-response-to-increasing-temperature
#17
Wenbing Tan, Beidou Xi, Guoan Wang, Jie Jiang, Xiao-Song He, Xuhui Mao, Ru-Tai Gao, Cai-Hong Huang, Hui Zhang, Dan Li, Yufu Jia, Ying Yuan, Xinyu Zhao
The electron transfer capacities (ETC) of soil humic substances (HS) are linked to the type and abundance of redox-active functional moieties in their structure. Natural temperature can affect the chemical structure of natural organic matter by regulating their oxidative transformation and degradation in soils. However, it is unclear if there is a direct correlation between ETC of soil HS and mean annual temperature. In this study, we assess the response of the electron accepting and electron donating capacities (EAC and EDC) of soil HS to temperature by analyzing HS extracted from soil sets along glacial-interglacial cycles through loess-palaeosol sequences and along natural temperature gradients through latitude and altitude transects...
February 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28211998/nanojoint-formation-between-ceramic-titanate-nanowires-and-spot-melting-of-metal-nanowires-with-electron-beam
#18
Arixin Bo, Jose Alarco, Huaiyong Zhu, Eric R Waclawik, Haifei Zhan, YuanTong Gu
Construction of nano-architectures requires techniques like joint formation and trimming. For ceramic materials, however, it is extremely difficult to form nanojoints by conventional methods like merging. In this work, we demonstrate that ceramic titanate nanowires (NWs) can be joined by spot melting under electron beam (e-beam) irradiation (EBI). The irradiation fuses the contacted spot of titanate NWs yielding an intact nanojoint. Nanojoints with different morphologies can be produced. The joint structures consist of titanium dioxide (TiO2) rutile, anatase and titanate phases in direction away from the e-beam melting spot...
February 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28211995/far-uv-annealed-inkjet-printed-in2o3-semiconductor-layers-for-tfts-on-flexible-pen-substrate
#19
Jaakko Henrik Leppäniemi, Kim Eiroma, Himadri Majumdar, Ari Alastalo
The inkjet-printing process of precursor solutions containing In-nitrate dissolved in 2-methoxyethanol is optimized using ethylene glycol as a co-solvent that allows the stabilization of the droplet formation, leading to a robust, repeatable printing process. The inkjet-printed precursor films are then converted to In2O3 semiconductors at flexible-substrate-compatible low-temperatures (150 - 200 °C) using combined far ultraviolet (FUV) exposure at ~160 nm and thermal treatment. The compositional nature of the precursor-to-metal oxide conversion is studied using grazing incidence X-ray diffraction (GIXRD), X-ray reflectivity (XRR) and Fourier transform infrared (FTIR) spectroscopy that indicate that amorphous, high density (up to 5...
February 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28211948/yield-and-cold-storage-of-trichoderma-conidia-is-influenced-by-substrate-ph-and-storage-temperature
#20
Johanna M Steyaert, Anastasia Chomic, Maria Nieto-Jacobo, Artemio Mendoza-Mendoza, Amanda J Hay, Mark Braithwaite, Alison Stewart
In this study we examined the influence of the ambient pH during morphogenesis on conidial yield of Trichoderma sp. "atroviride B" LU132 and T. hamatum LU593 and storage at low temperatures. The ambient pH of the growth media had a dramatic influence on the level of Trichoderma conidiation and this was dependent on the strain and growth media. On malt-extract agar, LU593 yield decreased with increasing pH (3-6), whereas yield increased with increasing pH for LU132. During solid substrate production the reverse was true for LU132 whereby yield decreased with increasing pH...
February 17, 2017: Journal of Basic Microbiology
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