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https://www.readbyqxmd.com/read/28532042/ph-responsive-poly-aspartic-acid-hydrogel-coated-magnetite-nanoparticles-for-biomedical-applications
#1
Jaime Vega-Chacón, María Isabel Amaya Arbeláez, Janaina Habib Jorge, Rodrigo Fernando C Marques, Miguel Jafelicci
A novel multifunctional nanosystem formed by magnetite nanoparticles coated with pH-responsive poly(aspartic acid) hydrogel was developed. Magnetite nanoparticles (Fe3O4) have been intensively investigated for biomedical applications due to their magnetic properties and dimensions similar to the biostructures. Poly(aspartic acid) is a water-soluble, biodegradable and biocompatible polymer, which features makes it a potential candidate for biomedical applications. The nanoparticles surface modification was carried out by crosslinking polysuccinimide on the magnetite nanoparticles surface and hydrolyzing the succinimide units in mild alkaline medium to obtain the magnetic poly(aspartic acid) hydrogel...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531850/in-situ-injection-of-potassium-hydroxide-into-briquetted-wheat-straw-and-meadow-grass-effect-on-biomethane-production
#2
Lu Feng, Veronica Moset, Wanwu Li, Chang Chen, Henrik Bjarne Møller
Alkaline pretreatment of lignocellulosic biomass has been intensively investigated but heavy water usage and environmental pollution from wastewater limits its industrial application. This study presents a pretreatment technique by in-situ injection of potassium hydroxide concentrations ranging from 0.8% to 10% (w/w) into the briquetting process of wheat straw and meadow grass. Results show that the biomethane yield and hydrolysis rate was improved significantly with a higher impact on wheat straw compared to meadow grass...
May 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28527323/revealing-the-ability-of-a-novel-polysaccharide-bioflocculant-in-bioremediation-of-heavy-metals-sensed-in-a-vibrio-bioluminescence-reporter-assay
#3
Arya Sajayan, G Seghal Kiran, S Priyadharshini, Navya Poulose, Joseph Selvin
A bioflocculant-producing bacterial strain, designated MSI021, was isolated from the marine sponge Dendrilla nigra and demonstrated 94% flocculation activity in a kaolin clay suspension. MSI021 was identified as Bacillus cereus based on phylogenetic affiliation and biochemical characteristics. The purified extra-cellular bioflocculant was chemically elucidated as a polysaccharide molecule. The polysaccharide bioflocculant was stable under both acidic and alkaline conditions (pH 2.0-10.0) and temperatures up to 100 °C...
May 17, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28525882/interfacially-crosslinked-composite-porous-membranes-for-ultrafast-removal-of-anionic-dyes-from-water-through-permeating-adsorption
#4
Cuijing Liu, Liang Cheng, Yifan Zhao, Liping Zhu
The dye wastewater is one of the most difficult industrial wastewaters to treat. It keeps a big challenge to realize fast removal of dyes from water by membrane filtration due to the trade-off between separation selectivity and permeation flux for ultrafiltration or nanofiltration (NF) process. Here we report novel composite porous membranes which can remove anionic dyes from water by ultrafast permeating adsorption. A crosslinked polyethyleneimine (PEI) polymer with strong adsorption ability was incorporated onto a nylon microfiltration membrane by the interfacial amidation reaction between PEI and trimesoyl chloride...
April 12, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28523861/a-bifunctional-hybrid-electrocatalyst-for-oxygen-reduction-and-evolution-cobalt-oxide-nanoparticles-strongly-coupled-to-b-n-decorated-graphene
#5
Yun Tong, Pengzuo Chen, Tianpei Zhou, Kun Xu, Wangsheng Chu, Changzheng Wu, Yi Xie
The electrocatalyzed oxygen reduction and evolution reactions (ORR and OER, respectively) are the core components of many energy conversion systems, including water splitting, fuel cells, and metal-air batteries. Rational design of highly efficient non-noble materials as bifunctional ORR/OER electrocatalysts is of great importance for large-scale practical applications. A new strongly coupled hybrid material is presented, which comprises CoOx nanoparticles rich in oxygen vacancies grown on B,N-decorated graphene (CoOx NPs/BNG) and operates as an efficient bifunctional OER/ORR electrocatalyst...
May 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28522005/biocompatible-microcrystalline-cellulose-particles-from-cotton-wool-and-magnetization-via-a-simple-in-situ-co-precipitation-method
#6
Mehnaz Rashid, Mohammad Abdul Gafur, Mostafa Kaiyum Sharafat, Hideto Minami, Mohd Abdul Jalil Miah, Hasan Ahmad
This investigation describes the preparation of magnetically doped degradable microcrystalline cellulose (MCC) nanocomposite particles with application potential in biotechnology, solid support for biomolecule/water purification, oil recovery from water and beyond. MCC was first extracted from cotton wool, the most abundant biocompatible polymer, by sulfuric acid hydrolysis and the effect of acid strength was examined. The size of the elongated fiber structure was reduced with increasing acid strength. MCC particles extracted by treatment with 70% sulfuric acid were used to prepare magnetic MCC nanocomposite particles...
August 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28516994/3d-ordered-porous-moxc-x-1-or-2-for-advanced-hydrogen-evolution-and-li-storage
#7
Hong Yu, Haosen Fan, Jiong Wang, Yun Zheng, Zhengfei Dai, Yizhong Lu, Junhua Kong, Xin Wang, Young Jin Kim, Qingyu Yan, Jong-Min Lee
3D ordered porous structures of MoxC are prepared with different Mo to C ratios and tested for two possible promising applications: hydrogen evolution reaction (HER) through water splitting and lithium ion batteries (LIBs). Mo2C and MoC with 3D periodic ordered structures are prepared with a similar process but different precursors. The 3D ordered porous MoC exhibits excellent cycling stability and rate performance as an anode material for LIBs. A discharge capacity of 450.9 mA h g(-1) is maintained up to 3000 cycles at 10...
May 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28516411/preparation-of-essential-oil-based-microemulsions-for-improving-the-solubility-ph-stability-photostability-and-skin-permeation-of-quercetin
#8
Xia Lv, Tiantian Liu, Huipeng Ma, Yan Tian, Lei Li, Zhen Li, Meng Gao, Jianbin Zhang, Zeyao Tang
Quercetin can bring many benefits to skin based on its various bioactivities. However, the therapeutic effect of quercetin is limited due to the poor water solubility, pH instability, light instability, and skin permeation. The aim of the present work was applying essential oil-based microemulsions to improve the solubility, pH stability, photostability, and skin permeation of quercetin for topical application. Peppermint oil (PO-ME), clove oil (CO-ME), and rosemary oil (RMO-ME) were selected as model essential oils...
May 17, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28516406/degradation-and-adsorption-of-tralkoxydim-in-chinese-soils-and-water-sediment-environments
#9
Wen Zhu Wu, Zheng Jun Shan, De Yang Kong, Jian He
Tralkoxydim is a cyclohexanedione herbicide primarily used for gramineous weed control in China. In this paper, we present results of a tralkoxydim laboratory environmental fate study characterizing its degradation, adsorption, and mobility behavior in three different soils and two water-sediment systems (river and lake) in China. Degradation half-life of tralkoxydim in soil under aerobic conditions was 5.1, 7.7, and 7.9 days in Jiangxi red soil, Taihu paddy soil, and Northeast China black soil, respectively...
June 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28516255/water-quality-interaction-with-alkaline-phosphatase-in-the-ganga-river-implications-for-river-health
#10
Amita Yadav, Jitendra Pandey
Carbon, nitrogen and phosphorus inputs through atmospheric deposition, surface runoff and point sources were measured in the Ganga River along a gradient of increasing human pressure. Productivity variables (chlorophyll a, gross primary productivity, biogenic silica and autotrophic index) and heterotrophy (respiration, substrate induced respiration, biological oxygen demand and fluorescein diacetate hydrolysis) showed positive relationships with these inputs. Alkaline phosphatase (AP), however, showed an opposite trend...
May 17, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28516141/wst-assay-data-reveal-a-ph-dependence-of-the-mitochondrial-succinate-reductase-in-osteoblast-like-cells
#11
Anne-Marie Galow, Jan Gimsa
The data presented in this article are related to the research article entitled "Increased osteoblast viability at alkaline pH in vitro provides a new perspective on bone regeneration" (doi: 10.1016/j.bbrep.2017.02.001; (Galow et al., 2017) [1]). The water soluble tetrazolium (WST) proliferation assay detects the metabolic activity of the respiratory chain of cultured cells. The assay is based on changes in the light absorbance resulting from the metabolism of WST-1 into formazane by mitochondrial succinate reductase...
June 2017: Data in Brief
https://www.readbyqxmd.com/read/28514528/overcoming-the-instability-of-nanoparticle-based-catalyst-films-in-alkaline-electrolysers-by-self-assembling-and-self-healing-films
#12
Stefan Barwe, Justus Masa, Corina Andronescu, Bastian Mei, Wolfgang Schuhmann, Edgar Ventosa
Engineering stable electrodes using highly active catalyst nanopowders for electrochemical water splitting remains a notorious challenge. We report an innovative and general approach for attaining highly stable catalyst films with self-healing capability based on in-situ self-assembly of catalyst particles during electrolysis. The catalyst particles are added to the electrolyte forming a suspension that is pumped through the electrolyzer. Particles with negatively charged surfaces stick onto the anode, while particles with positively charged surfaces stick to the cathode...
May 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28513886/regulating-water-reduction-kinetics-in-cobalt-phosphide-for-enhancing-her-catalytic-activity-in-alkaline-solution
#13
Kun Xu, Hui Ding, Mengxing Zhang, Min Chen, Zikai Hao, Lidong Zhang, Changzheng Wu, Yi Xie
Electrochemical water splitting to produce hydrogen renders a promising pathway for renewable energy storage. Considering limited electrocatalysts have good oxygen-evolution reaction (OER) catalytic activity in acid solution while numerous economical materials show excellent OER catalytic performance in alkaline solution, developing new strategies that enhance the alkaline hydrogen-evolution reaction (HER) catalytic activity of cost-effective catalysts is highly desirable for achieving highly efficient overall water splitting...
May 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28510419/sunlight-promotes-fast-release-of-hazardous-cadmium-from-widely-used-commercial-cadmium-pigment
#14
Huiting Liu, Han Gao, Mingce Long, Heyun Fu, Pedro J J Alvarez, Qilin Li, Shourong Zheng, Xiaolei Qu, Dongqiang Zhu
Cadmium pigments are widely used in the polymer and ceramic industry. Their potential environmental risk is under debate, being the major barrier for appropriate regulation. We show that 83.0 ± 0.2 % of hazardous cadmium ion (Cd2+) was released from the commercial cadmium sulfoselenide pigment (i.e., cadmium red) in aqueous suspension within 24 h under simulated sunlit conditions. This photo-dissolution process also generated sub-20 nm pigment nanoparticles. Cd2+ release is attributed to the reactions between photogenerated holes and the pigment lattices...
May 16, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28508337/natural-radionuclide-dose-and-lifetime-cancer-risk-due-to-ingestion-of-fish-and-water-from-fresh-water-reservoirs-near-the-proposed-uranium-mining-site
#15
Sathesh Kumar Annamalai, Kantha Deivi Arunachalam, Rajaram Selvaraj
Ten sampling locations in Nagarjuna Sagar Dam have been selected to assess the suitability of the reservoir water for human consumption. The sediment, water, and fish samples were collected and analyzed for radionuclide ((238)U, (232)Th, (210)Po, (226)Ra, (210)Pb) and physicochemical parameters like pH, TOC, total hardness, alkalinity, DO, cation exchange capacity, and particle size. The spatial variations among the radionuclides ((238)U, (232)Th, (210)Po, (226)Ra, (210)Pb) in water and bottom sediments of Nagarjuna Sagar Dam were determined...
May 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28507120/highly-active-catalyst-derived-from-a-3d-foam-of-fe-po3-2-ni2p-for-extremely-efficient-water-oxidation
#16
Haiqing Zhou, Fang Yu, Jingying Sun, Ran He, Shuo Chen, Ching-Wu Chu, Zhifeng Ren
Commercial hydrogen production by electrocatalytic water splitting will benefit from the realization of more efficient and less expensive catalysts compared with noble metal catalysts, especially for the oxygen evolution reaction, which requires a current density of 500 mA/cm(2) at an overpotential below 300 mV with long-term stability. Here we report a robust oxygen-evolving electrocatalyst consisting of ferrous metaphosphate on self-supported conductive nickel foam that is commercially available in large scale...
May 15, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28505456/self-polymerization-of-dopamine-in-acidic-environments-without-oxygen
#17
Tung-Po Chen, Tianchi Liu, Tsan-Liang Su, Jun-Feng Liang
An alkaline environment and the presence of oxygen are essential requirements for dopamine polymerization. In this study, we are the first to demonstrate the self-polymerization of dopamine through plasma-activated water (PAW) under acidic environments (pH<5.5). Resulting poly(dopamine) (PDA) were characterized using Nanosizer, SEM, FTIR, UV-vis, and fluorescence spectrophotometers and proved to have similar physical and chemical properties to those polymerized under a basic condition except that the PDA particles formed in PAW were more stable and hardly aggregated at varied pHs...
May 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28503260/dynamics-of-hexavalent-chromium-in-four-types-of-aquaculture-ponds-and-its-effects-on-the-morphology-and-behavior-of-cultured-clarias-gariepinus-burchell-1822
#18
Moshood Keke Mustapha
Hexavalent chromium is a bio accumulative toxic metal in water and fish. It enters aquaculture ponds mainly through anthropogenic sources. Hexavalent chromium concentrations and its effects on the morphology and behavior of Clarias gariepinus were investigated from four aquaculture ponds for 12 weeks. Chromium was measured using diphenyl carbohdrazide method; alkalinity and hardness were measured using colometric method and analyzed with Bench Photometer. Temperature and pH were measured using pH/EC/TDS/Temp combined tester...
April 2017: Toxicological Research
https://www.readbyqxmd.com/read/28499085/simultaneous-oxidation-and-sequestration-of-as-iii-from-water-by-using-redox-polymer-based-fe-iii-oxide-nanocomposite
#19
Xiaolin Zhang, Mengfei Wu, Hao Dong, Hongchao Li, Bing-Cai Pan
Water decontamination from As(III) is an urgent but still challenging task. Herein, we fabricated a bifunctional nanocomposite HFO@PS-Cl for highly efficient removal of As(III), with active chlorine covalently binding spherical polystyrene host for in situ oxidation of As(III) to As(V), and Fe(III) hydroxide (HFO) nanoparticles (NPs) embedded inside for specific As(V) removal. HFO@PS-Cl could work effectively in a wide pH range (5-9), and other ubiquitous anions like sulfate, chloride, bicarbonate, and silicate exert insignificant effect on As(III) removal...
May 12, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28498384/highly-efficient-oxygen-evolution-from-cos2-cnt-nanocomposites-via-a-one-step-electrochemical-deposition-and-dissolution-method
#20
Jizhang Yang, Zhi Yang, Lu Hua Li, Qiran Cai, Huagui Nie, Mengzhan Ge, Xi'an Chen, Ying Chen, Shaoming Huang
The oxygen evolution reaction (OER) has been viewed as a critical step in electrochemical energy conversion and storage devices. However, searching for cheap and efficient OER electrocatalysts still remains an urgent task. Herein, we develop a new strategy involving a one-step electrochemical deposition and dissolution method to fabricate hydrophilic porous CoS2/carbon nanotube (CNT) composites (CNT-CoS2). X-ray photoelectron spectroscopy and near-edge X-ray absorption fine structure spectroscopy measurements confirm the formation of hydrophilic groups on the surface of the porous CoS2 during electrochemical oxidation...
May 12, 2017: Nanoscale
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