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https://www.readbyqxmd.com/read/28738303/bio-accumulation-of-lanthanum-from-lanthanum-modified-bentonite-treatments-in-lake-restoration
#1
G Waajen, F van Oosterhout, M Lürling
Lanthanum (La) modified bentonite (LMB) is one of the available mitigating agents used for the reduction of the phosphorus (P) recycling in eutrophic lakes. The potential toxicity of the La from LMB to aquatic organisms is a matter of concern. In this study the accumulation of La was investigated in the macrophyte Elodea nuttallii, in chironomid larvae and in several fish species during periods up to five years following in situ LMB applications. The application of LMB increased the La concentration of exposed plants and animals...
July 21, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28738159/light-and-electrically-induced-phase-segregation-and-its-impact-on-the-stability-of-quadruple-cation-high-bandgap-perovskite-solar-cells
#2
The Duong, Hemant Kumar Mulmudi, Yiliang Wu, Xiao Fu, Heping Shen, Jun Peng, Nandi Wu, Hieu T Nguyen, Daniel MacDonald, Mark N Lockrey, Thomas P White, Klaus Weber, Kylie R Catchpole
Perovskite material with a bandgap of 1.7 eV - 1.8 eV is highly desirable for the top cell in a tandem configuration with a lower bandgap bottom cell, such as a silicon cell. This can be achieved by alloying iodide and bromide anions, but light-induced phase segregation phenomena is often observed in perovskite films of this kind, with implications for solar cell efficiency. Here we investigate light-induced phase segregation inside quadruple cation perovskite material in a complete cell structure, and find that the magnitude of this phenomenon is dependent on the operating condition of the solar cell...
July 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28737789/a-model-for-the-effect-of-bulk-liquid-viscosity-on-cavitation-bubble-dynamics
#3
Yang Shen, Kyuichi Yasui, Tong Zhu, Muthupandian Ashokkumar
A new model of single cavitation bubble dynamics has been developed to include the effect of bulk liquid viscosity in addition to the effects of evaporation/condensation of water vapor, thermal conduction and the compressibility of a liquid. In this study, the liquid viscosity is divided into two parts: viscosity at the bubble interface (μ') and viscosity of the bulk liquid (μ). A set of numerical calculations with and without μ has been completed under different viscosities (0.001-0.014 Pa s) to quantitatively analyze the effect of μ on single cavitation bubble dynamics...
July 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28736787/carbon-quantum-dots-with-intrinsic-mitochondrial-targeting-ability-for-mitochondria-based-theranostics
#4
Xian-Wu Hua, Yan-Wen Bao, Zhan Chen, Fu-Gen Wu
We prepare for the first time a novel type of fluorescent carbon quantum dot (or carbon dot, CD) with intrinsic mitochondrial targeting ability by a one-step hydrothermal treatment of chitosan, ethylenediamine and mercaptosuccinic acid. The as-prepared CDs can realize mitochondrial imaging and mitochondria-targeted photodynamic cancer therapy without further modifications of other mitochondriotropic ligands (such as triphenylphosphine, TPP). Currently, many commercial mitochondrial probes suffer from the lack of modifiable groups, poor photostability, short tracking time, high cost and/or complicated staining procedures, which severely limit their applications in live-cell mitochondrial imaging...
July 24, 2017: Nanoscale
https://www.readbyqxmd.com/read/28736461/behavioral-plasticity-in-response-to-perceived-predation-risk-in-breeding-house-wrens
#5
Erin E Dorset, Scott K Sakaluk, Charles F Thompson
Predation is a significant cause of nest failure in passerine birds, and, thus, natural selection is expected to favor behavioral plasticity to allow birds to respond to perceived changes in predation risk. However, behavioral plasticity in response to perceived predation risk, and its potential fitness-related costs, are understudied. In a wild population of breeding house wrens (Troglodytes aedon), we tested the hypotheses that (1) birds show behavioral plasticity in response to perceived nest-predation risk to reduce self-risk or risk to offspring, but (2) this plasticity incurs fitness-related costs...
June 2017: Evolutionary Biology
https://www.readbyqxmd.com/read/28736333/synthesis-and-characterization-of-a-multifunctional-gold-doxorubicin-nanoparticle-system-for-ph-triggered-intracellular-drug-release
#6
Ganesh V Khutale, Alan Casey
A nanoparticle drug carrier system has been developed to alter the cellular uptake and chemotherapeutic performance of an available chemotherapeutic drug. The system comprises of a multifunctional gold nanoparticle based drug delivery system (Au-PEG-PAMAM-DOX) as a novel platform for intracellular delivery of doxorubicin (DOX). Spherical gold nanoparticles were synthesized by a gold chloride reduction, stabilized with thiolated polyethylene glycol (PEG) and then covalently coupled with a polyamidoamine (PAMAM) G4 dendrimer...
July 20, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28735548/strain-driven-shape-evolution-of-stacked-in-ga-n-quantum-disks-embedded-in-gan-nanowires
#7
Javier Bartolomé, Michael Hanke, David van Treeck, Achim Trampert
The fabrication of nanowires with axial multi-quantum wells or disks presenting a homogeneous size and shape distribution along the whole stack is still an unresolved challenge, despite of being essential for narrowing their light emission bandwidth. In this work we demonstrate that the commonly observed change in the shape of the disks along the stacking direction proceeds in a systematic, predictable way. High- resolution transmission electron microscopy of stacked (In,Ga)N quantum discs embedded in GaN nanowires with diameters of ~40 nm and lengths of ~700 nm, and finite element method calculations show that, contrary to what is normally assumed, this change is not related to the radial growth of the nanowires, which is shown to be negligible, but to the strain relaxation of the whole active region...
July 22, 2017: Nano Letters
https://www.readbyqxmd.com/read/28735337/thresholds-of-toxicological-concern-setting-a-threshold-for-testing-below-which-there-is-little-concern
#8
Thomas Hartung
Low dose, low risk; very low dose, no real risk. Setting a pragmatic threshold below which concerns become negligible is the purpose of thresholds of toxicological concern (TTC). The idea is that such threshold values do not need to be established for each and every chemical based on experimental data, but that by analyzing the distribution of lowest or no-effect doses of many chemicals, a TTC can be defined - typically using the 5th percentile of this distribution and lowering it by an uncertainty factor of, e...
2017: ALTEX
https://www.readbyqxmd.com/read/28735170/effects-of-different-solvents-on-the-conformations-of-apoptotic-cytochrome-c-structural-insights-from-molecular-dynamics-simulation
#9
Gurusamy Muneeswaran, Subramanian Kartheeswaran, Kaliappan Muthukumar, Christopher D Dharmaraj, Chandran Karunakaran
Cytochrome c (cyt-c) upon binding with cardiolipin acquires peroxidase activity and is strictly connected to the pathogenesis of many human diseases including neurodegenerative and cardiovascular diseases. Interaction of cyt-c with cardiolipin mimics partial unfolding/conformational changes of cyt-c in different solvent environments. Dynamic pictures of these conformational changes of cyt-c are crucial in understanding their physiological roles in mitochondrial functions. Therefore, atomistic molecular dynamics (MD) simulations have been carried out to investigate the effect of different solvents (water, urea/water, MeOH and DMSO) on the structure and conformations of apoptotic cyt-c (Fe(3+))...
July 14, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28735151/do-air-pollution-and-neighborhood-greenness-exposures-improve-the-predicted-cardiovascular-risk
#10
Maayan Yitshak-Sade, Itai Kloog, Victor Novack
BACKGROUND: Numerous studies show associations between exposure to Particulate Matter and Cardiovascular disease (CVD). Current cardiovascular equations incorporate the major risk factors for CVD. The patients' environment, however, is not incorporated in these equations. METHODS: In a retrospective analysis, we assessed the contribution of neighborhood greenness and particulate matter (coarse-PM and PM<2.5μm-PM2.5) to the development of CVD by analyzing the change in prediction abilities...
July 20, 2017: Environment International
https://www.readbyqxmd.com/read/28734093/scaling-up-hcv-prevention-and-treatment-interventions-in-rural-usa-model-projections-for-tackling-an-increasing-epidemic
#11
Hannah Fraser, Jon Zibbell, Thomas Hoerger, Susan Hariri, Claudia Vellozzi, Natasha K Martin, Alex H Kral, Matthew Hickman, John W Ward, Peter Vickerman
BACKGROUND AND AIMS: Effective strategies are needed to address dramatic increases in hepatitis C virus (HCV) infection among people who inject drugs (PWID) in rural settings of the United States (US). We determined the required scale-up of HCV treatment with or without scale-up of HCV prevention interventions to achieve a 90% reduction in HCV chronic prevalence or incidence by 2025 and 2030 in a rural US setting. DESIGN: An ordinary differential equation model of HCV transmission calibrated to HCV epidemiological data obtained primarily from a HIV-outbreak investigation in Indiana...
July 22, 2017: Addiction
https://www.readbyqxmd.com/read/28733918/feasibility-of-optimized-ultralow-dose-pulsed-fluoroscopy-for-upper-gastrointestinal-tract-examinations-a-phantom-study-with-clinical-correlation
#12
Jakob Weiss, Andreas Pomschar, Carsten Rist, Klement Neumaier, Minglun Li, Wilhelm Flatz, Kolja Thierfelder, Mike Notohamiprodjo
PURPOSE: To establish an optimized ultralow-dose digital pulsed fluoroscopy (FP) protocol for upper gastrointestinal tract examinations and to investigate the radiation dose and image quality. MATERIALS AND METHODS: An Alderson-Rando-Phantom with 60 thermoluminescent dosimeters was used for dose measurements to systematically evaluate the dose-area product (DAP) and organ doses of the optimized FP protocol with the following acquisition parameters: 86.7 kV; 77 mA; 0...
July 22, 2017: La Radiologia Medica
https://www.readbyqxmd.com/read/28733639/particle-adsorption-on-hydrogel-surfaces-in-aqueous-media-due-to-van-der-waals-attraction
#13
Naoko Sato, Yurina Aoyama, Junpei Yamanaka, Akiko Toyotama, Tohru Okuzono
Particle adhesion onto hydrogels has recently attracted considerable attention because of the potential biomedical applications of the resultant materials. A variety of interactions have been taken advantage of for adsorption, including electrostatic forces, hydrophobic interactions and hydrogen bonding. In this study, we report significant adsorption of submicron-sized silica particles onto hydrogel surfaces in water, purely by van der Waals (vdW) attraction. The vdW forces enabled strong adhesions between dielectric materials in air...
July 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28733622/tumor-targeted-delivery-of-sirna-using-fatty-acyl-cgkrk-peptide-conjugates
#14
Meenakshi Sharma, Naglaa Salem El-Sayed, Hung Do, Keykavous Parang, Rakesh Kumar Tiwari, Hamidreza Montazeri Aliabadi
Tumor-targeted carriers provide efficient delivery of chemotherapeutic agents to tumor tissue. CGKRK is one of the well-known tumor targeting peptides with significant specificity for angiogenic blood vessels and tumor cells. Here, we designed fatty acyl conjugated CGKRK peptides, based on the hypothesis that hydrophobically-modified CGKRK peptide could enhance cellular permeation and delivery of siRNA targeted to tumor cells for effective silencing of selected proteins. We synthesized six fatty acyl-peptide conjugates, using a diverse chain of saturated and unsaturated fatty acids to study the efficiency of this approach...
July 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28732847/quaternized-carboxymethyl-chitosan-organic-montmorillonite-nanocomposite-as-a-novel-cosmetic-ingredient-against-skin-aging
#15
Kaihang Chen, Binzhao Guo, Jiwen Luo
It is of technical and economic importance to develop an effective cosmetic ingredient against skin aging through low-cost and facile production. This study developed a polymer/layered silicate nanocomposite as cosmetic ingredient against skin aging. Firstly, quaternized carboxymethyl chitosan (QCMC)/organic montmorillonite (OMMT) nanocomposite (QCOM) was fabricated via solution-induced intercalation. QCOM with different mass ratios of QCMC to OMMT were studied by various characterizations as well as moisture-adsorption and retention activities and UV-protection capacity...
October 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28732812/extracts-and-compounds-active-on-trp-ion-channels-from-waldheimia-glabra-a-ritual-medicinal-plant-from-himalaya
#16
Annamaria Giorgi, Angela Bassoli, Gigliola Borgonovo, Sara Panseri, Alessandra Manzo, Daniela Pentimalli, Aniello Schiano Moriello, Luciano De Petrocellis
BACKGROUND: Waldheimia glabra (Decne.) Regel is a wild plant from the Himalayan Mountains, commonly known as Smooth Ground Daisy. This plant is traditionally used by local populations in religious rituals (incense) or in traditional herbal medicine to treat skin diseases, headache, joint pain and fever. In literature few data are available on the investigation of this aromatic plant. PURPOSE: The present work aims at deepening knowledge about the chemical composition of W...
August 15, 2017: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/28732457/long-term-recurrence-of-venous-thromboembolism-after-short-term-treatment-of-symptomatic-isolated-distal-deep-vein-thrombosis-a-cohort-study
#17
Marco P Donadini, Francesco Dentali, Samuela Pegoraro, Fulvio Pomero, Chiara Brignone, Luigina Guasti, Luigi Steidl, Walter Ageno
Isolated distal deep vein thrombosis (IDDVT) is a common clinical manifestation of venous thromboembolism (VTE). However, there are only scant and heterogeneous data available on the long-term risk of recurrent VTE after IDDVT, and the optimal therapeutic management remains uncertain. We carried out a retrospective cohort study of consecutive patients diagnosed with symptomatic IDDVT between 2004 and 2011, according to a predefined short-term treatment protocol (low molecular weight heparin (LMWH) for 4-6 weeks)...
July 1, 2017: Vascular Medicine
https://www.readbyqxmd.com/read/28732441/determination-of-the-residual-entropy-of-simple-mixtures-by-monte-carlo-simulation
#18
Eric Detmar, Simin Yazdi Nezhad, Ulrich K Deiters
Extensive Monte Carlo simulations were performed for (neon + krypton) mixtures for temperatures between 200 and 600 K and pressures up to 1 GPa, using Lennard-Jones potentials to describe the intermolecular interactions. The residual entropies were obtained via Widom's insertion method as well as by an integration technique. At high pressures, the residual entropy is, to a very good approximation, a linear function of 1/λ_a, the reciprocal value of the average Monte Carlo displacement parameter that gives the acceptance ratio "a" for translational moves...
July 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28732290/synergistic-effect-of-uv-pretreated-fe-zsm-5-catalysts-for-heterogeneous-catalytic-complete-oxidation-of-voc-a-technology-development-for-sustainable-use
#19
Abdul Aziz, Kwang Soo Kim
In this work, the performance of benzene, toluene, ethylbenzene, and xylene (BTEX) removal and degradation from gas, air streams on UV pretreated Fe-ZSM-5 in a batch reactor at room temperature were studied. The Fe-ZSM-5 zeolite catalyst was prepared by hydrothermal reaction method. The influence of UV pre-irradiation time on the removal of BTEX were assessed by varying the time, ranging from 15min to 60smin. Then, sustainability of the activation of the catalyst resulted by UV pretreatment was studied by the four-cycle experiment with one time UV irradiation and after each cycle irradiation followed by BTEX removal after every cycle respectively...
July 10, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28732160/color-encoded-assays-for-the-simultaneous-quantification-of-dual-cancer-biomarkers
#20
Jun Ma, Lei Zhan, Rong Sheng Li, Peng Fei Gao, Cheng Zhi Huang
For the first time, the scattering light of noble nanoparticles was applied for the simultaneous detection of dual cancer biomarkers. Two nanoprobes with dual scattering light colors were used for the simultaneous imaging of alpha-fetoprotein (AFP) and carcinoembryonic antigen (CEA) based on the sandwich-type immunoassay. Since AFP can combine anti-AFP-modified gold nanoparticles which have green scattering light under dark-field microscopic imaging (iDFM) technique while CEA can conjugate anti-CEA-immobilized silver nanoparticles which have blue scattering light, the simultaneous determination of AFP and CEA can be achieved by separately counting the number of green and blue light spots in iDFM technique...
July 21, 2017: Analytical Chemistry
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