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https://www.readbyqxmd.com/read/29341838/immobilization-of-cross-linked-tannase-enzyme-on-multi-walled-carbon-nanotubes-and-its-catalytic-behavior
#1
Chong-Boon Ong, Mohamad S M Annuar
Immobilization of cross-linked tannase on pristine multi-walled carbon nanotubes (MWCNT) was successfully carried out. Cross-linking of tannase molecules was made via glutaraldehyde. The immobilized tannase exhibited significantly improved pH, thermal, and recycling stabilities. The optimal pH for both free- and immobilized tannase were observed at pH 5.0 with optimal operating temperature at 30 °C. Moreover, immobilized enzyme retained greater biocatalytic activities upon ten-repeated uses compared to free enzyme in solution...
January 17, 2018: Preparative Biochemistry & Biotechnology
https://www.readbyqxmd.com/read/29341621/sustainable-handaphos-ppm-palladium-technology-for-copper-free-sonogashira-couplings-in-water-under-mild-conditions
#2
Sachin Handa, Justin D Smith, Yitao Zhang, Balaram S Takale, Fabrice Gallou, Bruce H Lipshutz
Complexation of ca. 1000 ppm Pd(OAc)2 with the ligand HandaPhos (1-1.5:1) leads to a precatalyst that efficiently mediates Sonogashira couplings in aqueous nanomicelles under very mild conditions. Neither copper nor organic solvent is required in the reaction medium, and the product can be isolated directly from the reaction flask, leaving behind a reaction mixture that can be recycled without additional additives.
January 17, 2018: Organic Letters
https://www.readbyqxmd.com/read/29341383/co2-triggered-switchable-hydrophilicity-of-heterogeneous-conjugated-polymer-photocatalyst-for-enhanced-catalytic-activity-in-water
#3
Jeehye Byun, Wei Huang, Di Wang, Run Li, Kai A I Zhang
Water-compatibility of heterogeneous photocatalysts has been pursued for energy and environmental applications. However, there exists a trade-off between hydrophilicity and recyclability of the photocatalyst. Herein, we report a conjugated polymer photocatalyst with tertiary amine terminals that reversibly binds CO2 in water, generating a switchable hydrophilicity. The CO2-assisted hydrophilicity boosted up the photocatalytic efficiency in aqueous medium with minimum dosage. When CO2 was desorbed, the photocatalyst could be simply regenerated from reaction media, facilitating the repeated use of photocatalyst...
January 17, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29341109/the-prescribable-drugs-with-efficacy-in-experimental-epilepsies-pde3-database-for-drug-repurposing-research-in-epilepsy
#4
Shayeeshan Sivapalarajah, Mathangi Krishnakumar, Harry Bickerstaffe, YikYing Chan, Joseph Clarkson, Alistair Hampden-Martin, Ahmad Mirza, Matthew Tanti, Anthony Marson, Munir Pirmohamed, Nasir Mirza
OBJECTIVE: Current antiepileptic drugs (AEDs) have several shortcomings. For example, they fail to control seizures in 30% of patients. Hence, there is a need to identify new AEDs. Drug repurposing is the discovery of new indications for approved drugs. This drug "recycling" offers the potential of significant savings in the time and cost of drug development. Many drugs licensed for other indications exhibit antiepileptic efficacy in animal models. Our aim was to create a database of "prescribable" drugs, approved for other conditions, with published evidence of efficacy in animal models of epilepsy, and to collate data that would assist in choosing the most promising candidates for drug repurposing...
January 17, 2018: Epilepsia
https://www.readbyqxmd.com/read/29340862/effect-of-brewery-wastewater-obtained-from-different-phases-of-treatment-plant-on-seed-germination-of-chickpea-cicer-arietinum-maize-zea-mays-and-pigeon-pea-cajanus-cajan
#5
Rupa Salian, Suhas Wani, Ramamohan Reddy, Mukund Patil
Brewing industry releases large quantities of wastewater after product generation. Brewery wastewater contains organic compounds which are biodegradable in nature. These biodegradable wastes can be recycled and reused and hence considered as suitable products for agriculture. But before using wastewater for agriculture, it is better to evaluate the phytotoxic effects of wastewater on crops. Hence, the main objective of this study is to evaluate the effects of brewery effluent on seed germination and growth parameters of selected crop species like chickpea (Cicer arietinum), maize (Zea mays), and pigeon pea (Cajanus cajan)...
January 17, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29339823/phosphate-insensitive-aminophosphonate-mineralisation-within-oceanic-nutrient-cycles
#6
Jason P Chin, John P Quinn, John W McGrath
Many areas of the ocean are nutrient-poor yet support large microbial populations, leading to intense competition for and recycling of nutrients. Organic phosphonates are frequently found in marine waters, but require specialist enzymes for catabolism. Previous studies have shown that the genes that encode these enzymes in marine systems are under Pho regulon control and so are repressed by inorganic phosphate. This has led to the conclusion that phosphonates are recalcitrant in much of the ocean, where phosphorus is not limiting despite the degradative genes being common throughout the marine environment...
January 16, 2018: ISME Journal
https://www.readbyqxmd.com/read/29339212/autophagy-and-t-cell-metabolism
#7
Samuel D Dowling, Fernando Macian
Autophagy, a highly conserved catabolic process that involves the degradation and recycling of intracellular components in the lysosome, has emerged as a key process in the maintenance of T cell homeostasis and the regulation of T cell differentiation and function. In this review, we provide an overview of the mechanisms that mediates the regulation of autophagy in T cells and discuss different cellular processes that are under the control of autophagy in CD4+ and CD8+ T cells. A special emphasis is placed on the role that autophagy plays in the modulation of T cell metabolism and the consequences of this regulation on functional states and programs of differentiation in specific T cell populations...
January 12, 2018: Cancer Letters
https://www.readbyqxmd.com/read/29338696/transcriptional-responses-of-escherichia-coli-during-recovery-from-inorganic-or-organic-mercury-exposure
#8
Stephen P LaVoie, Anne O Summers
BACKGROUND: The protean chemical properties of mercury have long made it attractive for diverse applications, but its toxicity requires great care in its use, disposal, and recycling. Mercury occurs in multiple chemical forms, and the molecular basis for the distinct toxicity of its various forms is only partly understood. Global transcriptomics applied over time can reveal how a cell recognizes a toxicant and what cellular subsystems it marshals to repair and recover from the damage...
January 16, 2018: BMC Genomics
https://www.readbyqxmd.com/read/29338210/an-emission-free-vacuum-chlorinating-process-for-simultaneous-sulfur-fixation-and-lead-recovery-from-spent-lead-acid-batteries
#9
Kang Liu, Jiakuan Yang, Sha Liang, Huijie Hou, Ye Chen, Junxiong Wang, Bingchuan Liu, Keke Xiao, Jingping Hu, Jin Wang
Spent lead-acid battery recycling by using conventional technologies is usually accompanied with releases of lead-containing wastewater as well as emissions of sulfur oxides and lead particulates that may potentially cause secondary pollution. This study developed a vacuum chlorinating process for simultaneous sulfur fixation and high-purity lead chloride (PbCl2) recovery from spent lead paste by using calcium chloride (CaCl2) and silicon dioxide (SiO2) as reagents. The process train includes pretreatment, simultaneous PbCl2 production and sulfur fixation, and PbCl2 volatilization...
January 16, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29337429/co-expression-of-orfcma-with-phb-depolymerase-phazcma-in-escherichia-coli-induces-efficient-whole-cell-biodegradation-of-polyesters
#10
Ming-Chieh Lee, En-Jung Liu, Cheng-Han Yang, Li-Jung Hsiao, Tzong-Ming Wu, Si-Yu Li
Whole-cell degradation of polyesters not only avoids the tedious process of enzyme separation, but also allows the degraded product to be reused as a carbon source. In this study, Escherichia coli BL21(DE3) harboring phaZCma , a gene encoding poly(3-hydroxybutyrate) (PHB) depolymerase from Caldimonas manganoxidans, was constructed. The extra-cellular fraction of E. coli/pPHAZ exhibited a fast PHB degradation rate where it only took 35 h to completely degrade PHB films, while C. manganoxidans took 81 h to do the same...
January 16, 2018: Biotechnology Journal
https://www.readbyqxmd.com/read/29336954/high-voltage-fragmentation-of-composites-from-secondary-raw-materials-potential-and-limitations
#11
T Leißner, D Hamann, L Wuschke, H-G Jäckel, U A Peuker
The comminution of composites for liberation of valuable components is a costly and energy-intensive process within the recycling of spent products. It therefore is continuously studied and optimized. In addition to conventional mechanical comminution innovative new principles for size reduction have been developed. One is the use of high voltage (HV) pulses, which is known to be a technology selectively liberating along phase boundaries. This technology offers the advantage of targeted liberation, preventing overgrinding of the material and thus improving the overall processing as well as product quality...
January 11, 2018: Waste Management
https://www.readbyqxmd.com/read/29336807/functionalized-mof-nanocomposites-for-dispersive-solid-phase-extraction-and-enantioselective-capture-of-chiral-drug-intermediates
#12
Xue Ma, Xiaohua Zhou, Ajuan Yu, Wuduo Zhao, Wenfen Zhang, Shusheng Zhang, Linlin Wei, Debra J Cook, Anirban Roy
The facile preparation, characterization and application of a novel magnetic graphene oxide- metal organic framework [Zn2(d-Cam)2(4, 4'-bpy)]n (MGO-ZnCB) as a sorbent for fast, simple and enantioselective capture of chiral drug intermediates are presented in this paper. The MGO-ZnCB nanocomposite, developed by encapsulating MGO nanoparticles into the homochiral metal organic framework of ZnCB, can integrate the advantages from each component endowing the hybrids with improved synergystic effects. The enantioselective performance of MGO-ZnCB was evaluated by dispersive magnetic nanoparticle solid phase extraction (d-MNSPE) of 1, 1'-bi-2-naphthol (BN) and 2, 2'-furoin (Furoin) racemic solutions...
January 6, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29336482/litter-removal-in-a-tropical-rain-forest-reduces-fine-root-biomass-and-production-but-litter-addition-has-few-effects
#13
C Rodtassana, E V J Tanner
Many old-growth lowland tropical rain forests are potentially nutrient limited, and it has long been thought that many such forests maintain growth by recycling nutrients from decomposing litter. We investigated this by continuously removing (for ten years) freshly fallen litter from five (45 m x 45 m) plots, adding it to five other plots, there were five controls. From monthly measures over one year we show that litter removal caused lower: fine root (≤2 mm diameter) standing mass, fine root standing length, fine root length production and fine root length survivorship...
January 16, 2018: Ecology
https://www.readbyqxmd.com/read/29335469/structural-basis-for-chitin-acquisition-by-marine-vibrio-species
#14
Anuwat Aunkham, Michael Zahn, Anusha Kesireddy, Karunakar Reddy Pothula, Albert Schulte, Arnaud Baslé, Ulrich Kleinekathöfer, Wipa Suginta, Bert van den Berg
Chitin, an insoluble polymer of N-acetylglucosamine, is one of the most abundant biopolymers on Earth. By degrading chitin, chitinolytic bacteria such as Vibrio harveyi are critical for chitin recycling and maintenance of carbon and nitrogen cycles in the world's oceans. A decisive step in chitin degradation is the uptake of chito-oligosaccharides by an outer membrane protein channel named chitoporin (ChiP). Here, we report X-ray crystal structures of ChiP from V. harveyi in the presence and absence of chito-oligosaccharides...
January 15, 2018: Nature Communications
https://www.readbyqxmd.com/read/29335215/removing-antimony-from-waste-lead-storage-batteries-alloy-by-vacuum-displacement-reaction-technology
#15
Tiantian Liu, Keqiang Qiu
With the wide application of lead acid battery, spent lead acid battery has become a serious problem to environmental protection and human health. Though spent battery can be a contaminant if not handled properly, it is also an important resource to obtain refined lead. Nowadays, the Sb-content in lead storage batteries is about 0.5-3 wt%, which is higher than the Sb-content in the crude lead. However, there are few reports about the process of removing antimony from high-antimony lead bullion. In this study, vacuum displacement reaction technology, a new process for removing antimony from high-antimony lead melts, was investigated...
January 8, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29334177/polypropylene-nonwoven-fabric-poly-ionic-liquid-s-for-switchable-oil-water-separation-dye-absorption-and-antibacterial-applications
#16
Yongyuan Ren, Jiangna Guo, Dan Xu, Jing Qin, Qian Lu, Feng Yan
Pollutants in wastewater include oils, dyes, and bacteria, making wastewater cleanup difficult. Here, we propose the preparation of multifunctional wastewater treatment media, poly(ionic liquid) grafted polypropylene (PP) nonwoven fabrics (PP@PIL), prepared via a simple and scalable surface grafting process. The fabricated PP@PIL fabrics exhibited superior switchable oil/water separation (η > 99%) and dye absorption performance (q = 410 mg/g), as well as high antibacterial properties. The oil/water separation could be easily switched via anion-exchanging of PIL segments...
January 15, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29334175/efficient-catalytic-oxidation-of-5-hydroxymethylfurfural-to-2-5-furandicarboxylic-acid-by-magnetic-laccase-catalyst
#17
Ke-Feng Wang, Chun-Lei Liu, Kun-Yan Sui, Chen Guo, Chun-Zhao Liu
2,5-Furandicarboxylic acid (FDCA) is a biobased platform chemical for the production of polyesters. The magnetic laccase catalyst with TEMPO as the mediator has the remarkable capability of oxidizing HMF to 2,5-furandicarboxylic acid (FDCA). Under optimal reaction conditions, a quantitative yield (90.2%) of FDCA with complete HMF conversion was obtained after 96 h of reaction. More importantly, the magnetic laccase catalyst exhibited good recyclability and stability, maintaining 84.8% of its original activity following 6 reuse cycles...
January 15, 2018: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/29334086/n-doped-graphene-supported-pdcu-nanoalloy-as-efficient-catalyst-for-reducing-cr-vi-by-formic-acid
#18
Shuangzhi Li, Lijun Liu, Qing Zhao, Chiyang He, Weikai Liu
Reducing Cr(vi) to Cr(iii) with formic acid is desirable for environmental protection, but the sluggish kinetics limits its practical application, which currently motivates the intensive study of efficient catalysts for this redox reaction. Here bimetallic PdCu nanoalloy (∼5 nm in size) supported by N-doped graphene was synthesized through a one-pot hydrothermal process. The catalytic activity of PdCu nanoalloy highly depends on the Pd/Cu atomic ratio and N-doped graphene support. The obtained Pd6Cu4/NG shows superior catalysis towards the Cr(vi) reduction by formic acid with a high kinetic constant (kn = 23...
January 15, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29333927/comprehensive-characterization-of-hydrothermal-liquefaction-products-obtained-from-woody-biomass-under-various-alkali-catalyst-concentrations
#19
Hyewon Hwang, Jae Hoon Lee, In Gyu Choi, Joon Weon Choi
Hydrothermal liquefaction (HTL) of lignocellulosic biomass has been widely investigated for the production of renewable and alternative bio-crude oil. In this study, catalytic hydrothermal processing of two biomasses (larch and Mongolian oak) was performed using different K2CO3 concentrations (0, 0.1, 0.5, 1.0wt% of solvent) to improve fuel yield and properties. HTL oil, hydrochar, water soluble fraction (WSF) and gas were characterized and carbon balance was investigated. As a result, the maximum yield of HTL oil, 27...
January 15, 2018: Environmental Technology
https://www.readbyqxmd.com/read/29333558/selective-hydrogenation-of-nitroarenes-using-an-electrogenerated-polyoxometalate-redox-mediator
#20
Lewis MacDonald, Benjamin Rausch, Mark D Symes, Leroy Cronin
The 2-electron reduced form of the polyoxometalate silicotungstic acid (H4[SiW12O4]) is shown to be an effective and selective hydrogenation agent for a range of nitroarenes without the need for any co-catalyst. The ease of generation of the active species and its recyclability suggest that a new approach to this important class of chemical conversions is possible.
January 15, 2018: Chemical Communications: Chem Comm
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