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https://www.readbyqxmd.com/read/29223092/treatment-of-dye-wastewater-using-an-ultrasonic-aided-nanoparticle-stacked-activated-carbon-kinetic-and-isotherm-modelling
#1
Ponnusamy Senthil Kumar, Sunita J Varjani, Subburaj Suganya
The present work explains the biosorption of malachite green dye from aquatic systems by nano zero valent iron stacked activated carbon (NZVI-AC), which was prepared by dual surface modification strategy. NZVI-AC was characterized by using FTIR, SEM-EDX, XRD and TGA. NZVI-AC exhibited efficient performance in dye biosorption properties. Experimental variables such as time, pH, dye concentration, temperature and biosorbent dosage influenced Langmuir adsorption capacity of 187.3 mg/g. The present biosorption system was best described by pseudo-first order kinetics...
December 6, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29222984/suicidal-behaviour-is-associated-with-decreased-esterified-cholesterol-in-plasma-and-membrane-fluidity-of-platelets
#2
Boby Mathew, Krishnamachari Srinivasan, Johnson Pradeep, Tinku Thomas, Amit Kumar Mandal
BACKGROUND: Altered cholesterol levels in body fluids and brain tissues have been shown to be associated with suicidal behaviour, violence and aggression. But the biological underpinnings of this association in the pathophysiology of suicide are not clear. Cholesterol plays a crucial role in maintaining the cellular membrane fluidity and alterations in cellular membrane fluidity may impair serotonergic neurotransmission in the central nervous system. METHODS: We measured plasma esterified cholesterol and platelet membrane fluidity using fluorescence anisotropy and estimated flow activation energy which is a measure of order of membrane lipid bilayer in patients with recent suicidal attempt and compared with age and gender matched controls...
December 2, 2017: Asian Journal of Psychiatry
https://www.readbyqxmd.com/read/29222980/bonding-of-doxorubicin-to-nanosilica-and-human-serum-albumin-in-various-media
#3
V M Gun'ko, T V Krupska, L S Andriyko, N Yu Klymenko, I V Siora, O A Novikova, A I Marynin, A I Ukrainets, B Charmas, S B Shekhunova, V V Turov
Interaction of doxorubicin hydrochloride (DOX) (anti-cancer drug) with hydro-compacted nanosilica A-300 (cA-300) alone or cA-300/human serum albumin (HSA) at a small content of water (h = 0.4 g per gram of dry silica) in different dispersion media (air, chloroform, and chloroform/trifluoroacetic acid) was analyzed using low-temperature 1H NMR spectroscopy, NMR cryoporometry and quantum chemistry to elucidate specific changes in the interfacial layers. Initial (bulk density ρb ≈ 0.046 g/cm3) and hydro-compacted (ρb ≈ 0...
December 5, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29222660/testing-the-role-of-fiscal-policy-in-the-environmental-degradation-the-case-of-turkey
#4
Salih Katircioglu, Setareh Katircioglu
This study introduces a new research topic that investigates the relationship between fiscal development and carbon emissions in Turkey through testing Environmental Kuznets Curve (EKC) hypothesis. Annual data covering the period, 1960-2013, has been used and in addition to gross domestic product and energy consumption, fiscal policy variables have been regressed on the level of carbon emissions in Turkey. Results reveal that fiscal policies and carbon emissions are in long-term equilibrium relationship in Turkey; carbon dioxide emission level converges towards long-term paths as contributed by fiscal policy...
December 8, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29222099/isolation-of-the-pinoresinol-mineralizing-pseudomonas-sp-sg-ms2-and-elucidation-of-its-catabolic-pathway
#5
Madhura Shettigar, Sahil Balotra, David Cahill, Andrew C Warden, Michael J Lacey, Hans-Peter E Kohler, Daniel Rentsch, John G Oakeshott, Gunjan Pandey
Pinoresinol is a dimer of two β-β' linked coniferyl alcohol molecules. It is both a plant defence molecule synthesized from the shikimic acid pathway and a representative of several β-β linked dimers produced during the microbial degradation of lignin in dead plant material. Until now little has been known about the bacterial catabolism of such dimers. Here we report the isolation of an efficient (+)-pinoresinol mineralizing Pseudomonas sp. strain SG-MS2 and its catabolic pathway. Degradation of pinoresinol in this strain is inducible and proceeds via a novel oxidative route which is in contrast to the previously reported reductive transformation by other bacteria...
December 8, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29221408/exploring-a-multi-scale-method-for-molecular-simulation-in-continuum-solvent-model-explicit-simulation-of-continuum-solvent-as-an-incompressible-fluid
#6
Li Xiao, Ray Luo
We explored a multi-scale algorithm for the Poisson-Boltzmann continuum solvent model for more robust simulations of biomolecules. In this method, the continuum solvent/solute interface is explicitly simulated with a numerical fluid dynamics procedure, which is tightly coupled to the solute molecular dynamics simulation. There are multiple benefits to adopt such a strategy as presented below. At this stage of the development, only nonelectrostatic interactions, i.e., van der Waals and hydrophobic interactions, are included in the algorithm to assess the quality of the solvent-solute interface generated by the new method...
December 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29221405/on-the-non-stationary-generalized-langevin-equation
#7
Hugues Meyer, Thomas Voigtmann, Tanja Schilling
In molecular dynamics simulations and single molecule experiments, observables are usually measured along dynamic trajectories and then averaged over an ensemble ("bundle") of trajectories. Under stationary conditions, the time-evolution of such averages is described by the generalized Langevin equation. By contrast, if the dynamics is not stationary, it is not a priori clear which form the equation of motion for an averaged observable has. We employ the formalism of time-dependent projection operator techniques to derive the equation of motion for a non-equilibrium trajectory-averaged observable as well as for its non-stationary auto-correlation function...
December 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29221401/analytical-energy-gradients-for-explicitly-correlated-wave-functions-i-explicitly-correlated-second-order-m%C3%A3-ller-plesset-perturbation-theory
#8
Werner Győrffy, Gerald Knizia, Hans-Joachim Werner
We present the theory and algorithms for computing analytical energy gradients for explicitly correlated second-order Møller-Plesset perturbation theory (MP2-F12). The main difficulty in F12 gradient theory arises from the large number of two-electron integrals for which effective two-body density matrices and integral derivatives need to be calculated. For efficiency, the density fitting approximation is used for evaluating all two-electron integrals and their derivatives. The accuracies of various previously proposed MP2-F12 approximations [3C, 3C(HY1), 3*C(HY1), and 3*A] are demonstrated by computing equilibrium geometries for a set of molecules containing first- and second-row elements, using double-ζ to quintuple-ζ basis sets...
December 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29221376/eigenstate-specific-temperatures-in-two-level-paramagnetic-spin-lattices
#9
Mark B Masthay, Calley N Eads, Amber N Johnson, Robert G Keil, Philip Miller, Ross E Jones, Joe D Mashburn, Harry B Fannin
Increasing interest in the thermodynamics of small and/or isolated systems, in combination with recent observations of negative temperatures of atoms in ultracold optical lattices, has stimulated the need for estimating the conventional, canonical temperature Tcconv of systems in equilibrium with heat baths using eigenstate-specific temperatures (ESTs). Four distinct ESTs-continuous canonical, discrete canonical, continuous microcanonical, and discrete microcanonical-are accordingly derived for two-level paramagnetic spin lattices (PSLs) in external magnetic fields...
December 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29221218/tert-rs2736098-ex2-659g-a-polymorphism-and-cancer-susceptibility-evidence-from-a-comprehensive-meta-analysis
#10
Tingyuan Pang, Minjie Zhou, Rumin Liu, Jia Luo, Renfei Xia
Increasing researches have been performed regarding the relationship between TERT rs2736098 and cancer risk, but no consensus has been reached about the relationship. Here, we conducted this updated meta-analysis, aiming to comprehensively evaluate the role of TERT rs2736098 in cancer risk. We systematically searched potential relevant articles through PubMed, EMBASE, CNKI, and WanFang database before August 2017. A total of 33 studies with 18685 cases and 23820 controls were finally included in the current meta-analysis...
November 10, 2017: Oncotarget
https://www.readbyqxmd.com/read/29220818/reuse-of-sustainable-materials-for-xylenol-orange-dye-and-copper-ii-ion-ammoniacal-removal
#11
M I Garrudo-Guirado, A Blanco-Flores, H P Toledo-Jaldin, V Sánchez-Mendieta, A R Vilchis-Néstor
Water pollution caused by heavy metals and organic compounds is an environmental problem with negative impact, making the restoration of water quality a priority. In this paper, the adsorption of xylenol orange dye (XO) on vitreous tuff mineral (VT) was studied. It was established that the adsorption capacity of VT was 45.17 mg/g. The removal was carried out by interactions between active sites on the surface of the material and the functional groups of the dye. The solid waste obtained from this process (VTXO) was reused as adsorbent material for Cu removal in the form of the complex Cu-NH3 because this process was done in an ammoniacal medium...
December 5, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/29220774/mitigating-land-pollution-through-pesticide-packages-the-case-of-a-collection-scheme-in-rural-china
#12
Shuqin Jin, Bettina Bluemling, Arthur P J Mol
Pesticide packages that are discarded on agricultural land can contaminate water bodies and pose a threat to the environment and human health. Little is known about how developing countries deal with this kind of land pollution. While in developed countries, packages are collected by professional organizations, the smallholder context in developing countries makes the collection of this waste much more difficult. This paper introduces and analyses a successful Pesticide Package Collection Scheme in one of the poorest regions in China, i...
December 5, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29220727/the-health-impacts-of-weekday-traffic-a-health-risk-assessment-of-pm2-5-emissions-during-congested-periods
#13
Weeberb J Requia, Christopher D Higgins, Matthew D Adams, Moataz Mohamed, Petros Koutrakis
Little work has accounted for congestion, using data that reflects driving patterns, traffic volume, and speed, to examine the association between traffic emissions and human health. In this study, we performed a health risk assessment of PM2.5 emissions during congestion periods in the Greater Toronto and Hamilton Area (GTHA), Canada. Specifically, we used a micro-level approach that combines the Stochastic User Equilibrium Traffic Assignment Algorithm with a MOVES emission model to estimate emissions considering congestion conditions...
December 5, 2017: Environment International
https://www.readbyqxmd.com/read/29220689/preparation-of-magnetically-recoverable-bentonite-fe3o4-mno2-composite-particles-for-cd-ii-removal-from-aqueous-solutions
#14
Liying Jiang, Qichao Ye, Jianmeng Chen, Zhong Chen, Youli Gu
In this study, bentonite-Fe3O4-MnO2 composite was synthesized by combining bentonite with Fe3O4 and MnO2 through co-precipitation. Vibrating-sample magnetometry, scanning electron microscopy with energy-dispersive X-ray spectrometry, transmission electron microscopy, Brunauer-Emmett-Teller measurements, and X-ray powder diffraction techniques were used to characterize the composite. The composite consists of Fe3O4 nanoparticles orderly assembled on the surface of bentonite and an outer layer of MnO2 sheets...
November 22, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29220577/from-solvent-free-to-dilute-electrolytes-essential-components-for-a-continuum-theory
#15
Nir Gavish, Doron Elad, Arik Yochelis
The increasing number of experimental observations on highly concentrated electrolytes and ionic liquids show qualitative features that are distinct from dilute or moderately concentrated electrolytes, such as self-assembly, multiple-time relaxation, and under-screening, which all impact the emergence of fluid/solid interfaces, and transport in these systems. Since these phenomena are not captured by existing mean field models of electrolytes, there is a paramount need for a continuum framework for highly concentrated electrolytes and ionic liquids...
December 8, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29220511/unbiased-estimate-of-synonymous-and-non-synonymous-substitution-rates-with-non-stationary-base-composition
#16
Laurent Guéeguen, Laurent Duret
The measurement of synonymous and non-synonymous substitution rates (dS and dN) is useful for assessing selection operating on protein sequences or for investigating mutational processes affecting genomes. In particular, the ratio dNdS is expected to be a good proxy for ω, the ratio of fixation robabilities of non-synonymous mutations relative to that of neutral mutations. Standard methods for estimating dN, dS or ω rely on the assumption that the base composition of sequences is at the equilibrium of the evolutionary process...
December 6, 2017: Molecular Biology and Evolution
https://www.readbyqxmd.com/read/29220178/equilibrium-between-a-droplet-and-surrounding-vapor-a-discussion-of-finite-size-effects
#17
Andreas Troester, Fabian Schmitz, Peter Virnau, Kurt Binder
In a theoretical description of homogeneous nucleation one frequently assumes an ``equilibrium'' coexistence of a liquid droplet with surrounding vapor of a density exceeding that of a saturated vapor at bulk vapor-liquid two-phase coexistence. Thereby one ignores the caveat that in the thermodynamic limit, for which the vapor would be called supersaturated, such states will at best be metastable with finite lifetime, and thus not be well-defined within equilibrium statistical mechanics. In contrast, in a system of finite volume stable equilibrium coexistence of droplet and supersaturated vapor at constant total density is perfectly possible, and numerical analysis of equilibrium free energies of finite systems allows to obtain physically relevant results...
December 8, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29220090/mesophyll-conductance-in-zea-mays-responds-transiently-to-co2-availability-implications-for-transpiration-efficiency-in-c4-crops
#18
Allison R Kolbe, Asaph B Cousins
Mesophyll conductance (gm ) describes the movement of CO2 from the intercellular air spaces below the stomata to the site of initial carboxylation in the mesophyll. In contrast with C3 -gm , little is currently known about the intraspecific variation in C4 -gm or its responsiveness to environmental stimuli. To address these questions, gm was measured on five maize (Zea mays) lines in response to CO2 , employing three different estimates of gm . Each of the methods indicated a significant response of gm to CO2 ...
December 8, 2017: New Phytologist
https://www.readbyqxmd.com/read/29219966/gigadalton-scale-shape-programmable-dna-assemblies
#19
Klaus F Wagenbauer, Christian Sigl, Hendrik Dietz
Natural biomolecular assemblies such as molecular motors, enzymes, viruses and subcellular structures often form by self-limiting hierarchical oligomerization of multiple subunits. Large structures can also assemble efficiently from a few components by combining hierarchical assembly and symmetry, a strategy exemplified by viral capsids. De novo protein design and RNA and DNA nanotechnology aim to mimic these capabilities, but the bottom-up construction of artificial structures with the dimensions and complexity of viruses and other subcellular components remains challenging...
December 6, 2017: Nature
https://www.readbyqxmd.com/read/29218993/energy-landscape-of-the-substrate-translocation-equilibrium-of-plasma-membrane-glutamate-transporters
#20
Jiali Wang, Thomas Albers, Christof T Grewer
Glutamate transporters maintain a large glutamate concentration gradient across synaptic membranes and are, thus, critical for functioning of the excitatory synapse. Mammalian glutamate transporters concentrate glutamate inside cells through energetic coupling of glutamate flux to the transmembrane concentration gradient of Na+. Structural models based on an archeal homologue of mammalian glutamate transporters, GltPh, suggest an elevator-like carrier mechanism. However, the energetic determinants of this carrier-based movement are not well understood...
December 8, 2017: Journal of Physical Chemistry. B
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