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https://www.readbyqxmd.com/read/28208260/simultaneous-enhancement-of-bioactivity-and-stability-of-laccase-by-cu-2-paa-ppega-matrix-for-efficient-biosensing-and-recyclable-decontamination-of-pyrocatechol
#1
Tao Chen, Yuanhong Xu, Zhi Peng, Aihua Li, Jingquan Liu
Simultaneously enhancing the catalytic bioactivity and stability of enzyme is still an intractable issue in the enzymatic study. Herein, a facile and effective approach was designed to immobilize and modify laccase on a Cu(2+)-adsorbed pyrene-terminated block copolymer [poly(acrylic acid)/poly(poly(ethylene glycol) acrylate)] (PAA/PPEGA), which was prepared via well-controlled reversible addition-fragmentation chain transfer polymerization. PAA provided the supporting matrix for firm immobilization of Cu(2+), an enzyme bioactivity inducer, onto the microstructure of laccase, while avoiding any contamination of the heavy metal Cu(2+) into the following application system...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28189108/adsorbent-synthesis-of-polypyrrole-tio2-for-effective-fluoride-removal-from-aqueous-solution-for-drinking-water-purification-adsorbent-characterization-and-adsorption-mechanism
#2
Jie Chen, Chiajung Shu, Ning Wang, Jiangtao Feng, Hongyu Ma, Wei Yan
More than 20 countries are still suffering problems of excessive fluoride containing water, and greater than 8mg/L fluoride groundwater has been reported in some villages in China. In order to meet the challenge in the drinking water defluoridation engineering, a high efficiency and affinity defluoridation adsorbent PPy/TiO2 composite was designed and synthetized by in-situ chemical oxidative polymerization. Fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction Investigator (XRD), X-ray photoelectron spectroscopy (XPS), Thermogravimetric analysis (TG), N2 isotherm analysis, Scanning Electron Microscopy (SEM) and Zeta potential analysis were conducted to characterize surface and textural properties of the as-prepared PPy/TiO2, and the possibility of fluoride adsorption was carefully estimated by adsorption isotherm and kinetic studies...
January 24, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28185853/sustainable-management-and-utilisation-of-concrete-slurry-waste-a-case-study-in-hong-kong
#3
Md Uzzal Hossain, Dongxing Xuan, Chi Sun Poon
With the promotion of environmental protection in the construction industry, the mission to achieve more sustainable use of resources during the production process of concrete is also becoming important. This study was conducted to assess the environmental sustainability of concrete slurry waste (CSW) management by life cycle assessment (LCA) techniques, with the aim of identifying a resource-efficient solution for utilisation of CSW in the production of partition wall blocks. CSW is the dewatered solid residues deposited in the sedimentation tank after washing out over-ordered/rejected fresh concrete and concrete trucks in concrete batching plants...
February 6, 2017: Waste Management
https://www.readbyqxmd.com/read/28185364/enabling-heterogeneous-gold-catalysis-with-patchy-micelles
#4
John R Finnegan, Jessica Gwyther, Ian Manners
Patch works! Patchy block copolymer micelles with a corona consisting of two chemically different patches have been designed for the selective binding of catalytically active nanoparticles. The fabrication of nonwoven supports by electrospinning was combined with crystallization-driven self-assembly for precise control over micelle formation to prepare a new recyclable catalyst platform.
February 10, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28183015/synergistic-degradation-of-phenols-using-peroxymonosulfate-activated-by-cuo-co3o4-mno2-nanocatalyst
#5
Aimal Khan, Zhuwei Liao, Yong Liu, Ali Jawad, Jerosha Ifthikar, Zhuqi Chen
The development of transition metal based heterogeneous catalysts with efficient reactivity and intensive stability is of great demand in peroxymonosulfate based AOPs in water treatment. Herein, we present a novel approach of creating stable and effective nano-rod catalyst of CuCo@MnO2 with tetragonal structure. A remarkable synergetic effect was found between bi-metallic oxides of Cu and Co: 0.5%Cu-2%Co-MnO2 can efficiently degrade 100% of 30ppm phenol, while 0.5%Cu@MnO2 or 2%Co@MnO2 alone is apparently sluggish for the degradation of organic contaminants...
January 19, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28180185/precision-therapy-for-a-new-disorder-of-ampa-receptor-recycling-due-to-mutations-in-atad1
#6
Rebecca C Ahrens-Nicklas, George K E Umanah, Neal Sondheimer, Matthew A Deardorff, Alisha B Wilkens, Laura K Conlin, Avni B Santani, Addie Nesbitt, Jane Juulsola, Erica Ma, Ted M Dawson, Valina L Dawson, Eric D Marsh
OBJECTIVE: ATAD1 encodes Thorase, a mediator of α-amino-3-hydroxy-5-methylisoxazole-4-proprionate (AMPA) receptor recycling; in this work, we characterized the phenotype resulting from ATAD1 mutations and developed a targeted therapy in both mice and humans. METHODS: Using exome sequencing, we identified a novel ATAD1 mutation (p.E276X) as the etiology of a devastating neurologic disorder characterized by hypertonia, seizures, and death in a consanguineous family...
February 2017: Neurology. Genetics
https://www.readbyqxmd.com/read/28177604/green-in-situ-synthesis-of-clean-3d-chestnutlike-ag-wo3-x-nanostructures-for-highly-efficient-recyclable-and-sensitive-sers-sensing
#7
Jian Huang, Dayan Ma, Feng Chen, Dongzhen Chen, Min Bai, Kewei Xu, Yongxi Zhao
Surface-enhanced Raman scattering (SERS) has proven to be an effective technique for identifying and providing fingerprint structural information on various analytes in low concentration. However, this analytical technique has been plagued by the ubiquitous presence of organic contaminants on roughened SERS substrate surfaces, which not only often result in poorer detection sensitivity but also significantly affect the reproducibility and accuracy of SERS analysis. Herein, we developed a clean, stable, and recyclable three-dimensional (3D) chestnutlike Ag/WO3-x (0 < x < 0...
February 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28167761/global-socioeconomic-material-stocks-rise-23-fold-over-the-20th-century-and-require-half-of-annual-resource-use
#8
Fridolin Krausmann, Dominik Wiedenhofer, Christian Lauk, Willi Haas, Hiroki Tanikawa, Tomer Fishman, Alessio Miatto, Heinz Schandl, Helmut Haberl
Human-made material stocks accumulating in buildings, infrastructure, and machinery play a crucial but underappreciated role in shaping the use of material and energy resources. Building, maintaining, and in particular operating in-use stocks of materials require raw materials and energy. Material stocks create long-term path-dependencies because of their longevity. Fostering a transition toward environmentally sustainable patterns of resource use requires a more complete understanding of stock-flow relations...
February 6, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28165090/adsorptive-process-design-for-the-separation-of-hexane-isomers-using-zeolites
#9
A Luna-Triguero, P Gómez-Álvarez, S Calero
The product of catalytic isomerization is a mixture of linear and branched hydrocarbons that are in thermodynamic equilibrium, and their separation becomes necessary in the petrochemical industry. Zeolite 5A is usually industrially used to sieve alkane isomers, but its pore size allows only the separation of linear alkanes from the monobranched and dibranched alkanes by a kinetic mechanism. A more efficient approach to improve the average research octane number would be to adsorptively separate the di-methyl alkanes as products and recycle both the linear and mono-methyl alkanes to the isomerization reactor...
February 6, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28152460/employing-a-cge-model-in-analysing-the-environmental-and-economy-wide-impacts-of-co2-emission-abatement-policies-in-malaysia
#10
Masoud Yahoo, Jamal Othman
The impact of global warming has received much international attention in recent decades. To meet climate-change mitigation targets, environmental policy instruments have been designed to transform the way goods and services are produced as well as alter consumption patterns. The government of Malaysia is strongly committed to reducing CO2 gas emissions as a proportion of GDP by 40% from 2005 levels by the year 2020. This study evaluates the economy-wide impacts of implementing two different types of CO2 emission abatement policies in Malaysia using market-based (imposing a carbon tax) and command-and-control mechanism (sectoral emission standards)...
January 30, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28151662/logic-controlled-radical-polymerization-with-heat-and-light-multiple-stimuli-switching-of-polymer-chain-growth-via-a-recyclable-thermally-responsive-gel-photoredox-catalyst
#11
Mao Chen, Shihong Deng, Yuwei Gu, Jun Lin, Michelle J MacLeod, Jeremiah A Johnson
Strategies for switching polymerizations between "ON" and "OFF" states offer new possibilities for materials design and fabrication. While switching of controlled radical polymerization has been achieve using light, applied voltage, allosteric effects, chemical reagents, pH, and mechanical force, it is still challenging to introduce multiple external switches using the same catalyst to achieve logic gating of controlled polymerization reactions. Herein, we report an easy-to-synthesize thermally responsive organo-/hydro-gel that features covalently bound 10-phenylphenothiazine (PTH)...
February 2, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28151644/improved-lysosomal-trafficking-can-modulate-the-potency-of-antibody-drug-conjugates
#12
Rachel M DeVay, Kathy Delaria, Guoyun Zhu, Charles Holz, Davide Foletti, Janette Sutton, Gary Bolton, Russell Dushin, Christine Bee, Jaume Pons, Arvind Rajpal, Hong Liang, David Shelton, Shu-Hui Liu, Pavel Strop
Antibody drug conjugates (ADCs) provide an efficacious and relatively safe means by which chemotherapeutic agents can be specifically targeted to cancer cells. In addition to the selection of antibody targets, ADCs offer a modular design that allows selection of ADC characteristics through the choice of linker chemistries, toxins, and conjugation sites. Many studies have indicated that release of toxins bound to antibodies via noncleavable linker chemistries relies on the internalization and intracellular trafficking of the ADC...
February 13, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28139798/chiral-gap-catalysts-of-phosphonylated-imidazolidinones-and-their-applications-in-asymmetric-diels-alder-and-friedel-crafts-reactions
#13
Shuo Qiao, Junming Mo, Cody B Wilcox, Bo Jiang, Guigen Li
The design and synthesis of recyclable imidazolidinone catalysts using GAP chemistry/technique was described. Their applications in asymmetric Diels-Alder and Friedel-Crafts reactions with α,β-unsaturated aldehydes resulted in excellent yields and higher enantioselectivities than previous processes. As recyclable small molecular catalysts, phosphonylated imidazolidinones can be recovered and reused for up to three runs without costing significant decrease in catalytic activity.
January 31, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28120861/intracellular-degradation-of-functionalized-carbon-nanotube-iron-oxide-hybrids-is-modulated-by-iron-via-nrf2-pathway
#14
Dan Elgrabli, Walid Dachraoui, Hélène de Marmier, Cécilia Ménard-Moyon, Dominique Bégin, Sylvie Bégin-Colin, Alberto Bianco, Damien Alloyeau, Florence Gazeau
The in vivo fate and biodegradability of carbon nanotubes is still a matter of debate despite tremendous applications. In this paper we describe a molecular pathway by which macrophages degrade functionalized multi-walled carbon nanotubes (CNTs) designed for biomedical applications and containing, or not, iron oxide nanoparticles in their inner cavity. Electron microscopy and Raman spectroscopy show that intracellularly-induced structural damages appear more rapidly for iron-free CNTs in comparison to iron-loaded ones, suggesting a role of iron in the degradation mechanism...
January 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28107748/tracing-the-sources-and-cycling-of-phosphorus-in-river-sediments-using-oxygen-isotopes-methodological-adaptations-and-first-results-from-a-case-study-in-france
#15
Chiara Pistocchi, Federica Tamburini, Gerard Gruau, André Ferhi, Dominique Trevisan, Jean-Marcel Dorioz
An essential aspect of eutrophication studies is to trace the ultimate origin of phosphate ions (P-PO4) associated with the solid phase of river sediments, as certain processes can make these ions available for algae. However, this is not a straightforward task because of the diversity of allochthonous and autochthonous sources that can supply P-PO4 to river sediments as well as the existence of in-stream processes that can change the speciation of these inputs and obscure the original sources. Here, we present the results of a study designed to explore the potentials, limitations and conditions for the use of the oxygen isotope composition of phosphate (δ(18)Op) extracted from river sediments for this type of tracing...
December 26, 2016: Water Research
https://www.readbyqxmd.com/read/28098187/carbon-elimination-from-silicon-kerf-thermogravimetric-analysis-and-mechanistic-considerations
#16
Miguel Vazquez-Pufleau, Tandeep S Chadha, Gregory Yablonsky, Pratim Biswas
40% of ultrapure silicon is lost as kerf during slicing to produce wafers. Kerf is currently not being recycled due to engineering challenges and costs associated with removing its abundant impurities. Carbon left behind from the lubricant remains as one of the most difficult contaminants to remove in kerf without significant silicon oxidation. The present work enables to better understand the mechanism of carbon elimination in kerf which can aid the design of better processes for kef recycling and low cost photovoltaics...
January 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28097922/cascade-use-indicators-for-selected-biopolymers-are-we-aiming-for-the-right-solutions-in-the-design-for-recycling-of-bio-based-polymers
#17
Jakob Hildebrandt, Alberto Bezama, Daniela Thrän
When surveying the trends and criteria for the design for recycling (DfR) of bio-based polymers, priorities appear to lie in energy recovery at the end of the product life of durable products, such as bio-based thermosets. Non-durable products made of thermoplastic polymers exhibit good properties for material recycling. The latter commonly enjoy growing material recycling quotas in countries that enforce a landfill ban. Quantitative and qualitative indicators are needed for characterizing progress in the development towards more recycling friendly bio-based polymers...
January 1, 2017: Waste Management & Research
https://www.readbyqxmd.com/read/28097682/evaluation-of-perforated-demineralized-dentin-scaffold-on-bone-regeneration-in-critical-size-sheep-iliac-defects
#18
Md Arafat Kabir, Masaru Murata, Toshiyuki Akazawa, Kaoru Kusano, Katsuhisa Yamada, Manabu Ito
OBJECTIVES: Regenerating critical-size bone injury is a major problem that continues to inspire the design of new graft materials. Therefore, tissue engineering has become a novel approach for targeting bone regeneration applications. Human teeth are a rich source of stem cells, matrix, trace metal ions, and growth factors. A vital tooth-derived demineralized dentin matrix is acid-insoluble and composed of cross-linked collagen with growth factors. In this study, we recycled human non-functional tooth into a unique geometric dentin scaffold, entitled perforated root-demineralized dentin matrix (PR-DDM)...
January 17, 2017: Clinical Oral Implants Research
https://www.readbyqxmd.com/read/28089397/challenges-for-critical-raw-material-recovery-from-weee-the-case-study-of-gallium
#19
Maximilian Ueberschaar, Sarah Julie Otto, Vera Susanne Rotter
Gallium and gallium compounds are more frequently used in future oriented technologies such as photovoltaics, light diodes and semiconductor technology. In the long term the supply risk is estimated to be critical. Germany is one of the major primary gallium producer, recycler of gallium from new scrap and GaAs wafer producer. Therefore, new concepts for a resource saving handling of gallium and appropriate recycling strategies have to be designed. This study focus on options for a possible recycling of gallium from waste electric and electronic equipment...
January 12, 2017: Waste Management
https://www.readbyqxmd.com/read/28073499/physiological-and-transcriptional-responses-to-inorganic-nutrition-in-a-tropical-pacific-strain-of-alexandrium-minutum-implications-for-the-saxitoxin-genes-and-toxin-production
#20
Kieng Soon Hii, Po Teen Lim, Nyuk Fong Kon, Yoshinobu Takata, Gires Usup, Chui Pin Leaw
Saxitoxins (STXs) constitute a family of potent sodium channel blocking toxins, causative agents of paralytic shellfish poisoning (PSP), and are produced by several species of marine dinoflagellates and cyanobacteria. Two STX-core genes, sxtA and sxtG, have been well elucidated in Alexandrium but the expression of these genes under various nutritional modes in tropical species remains unclear. This study investigates the physiological responses of a tropical Pacific strain of Alexandrium minutum growing with nitrate or ammonium, and with various nitrogen to phosphorus (N:P) supply ratios...
June 2016: Harmful Algae
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