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https://www.readbyqxmd.com/read/28533069/enrichment-and-characterization-of-hydrocarbon-degrading-bacteria-from-petroleum-refinery-waste-as-potent-bioaugmentation-agent-for-in-situ-bioremediation
#1
Poulomi Sarkar, Ajoy Roy, Siddhartha Pal, Balaram Mohapatra, Sufia K Kazy, Mrinal K Maiti, Pinaki Sar
Intrinsic biodegradation potential of bacteria from petroleum refinery waste was investigated through isolation of cultivable strains and their characterization. Pseudomonas and Bacillus spp. populated the normal cultivable taxa while prolonged enrichment with hydrocarbons and crude oil yielded hydrocarbonoclastic bacteria of genera Burkholderia, Enterobacter, Kocuria, Pandoraea, etc. Strains isolated through enrichment showed assemblages of superior metabolic properties: utilization of aliphatic (C6-C22) and polyaromatic compounds, anaerobic growth with multiple terminal electron acceptors and higher biosurfactant production...
May 4, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28530394/electrogeneration-of-gold-nanoparticles-on-porous-carbon-paper-based-electrodes-and-application-to-inorganic-arsenic-analysis-in-white-wines-by-chronoamperometric-stripping
#2
Estefanía Nunez-Bajo, Maria Carmen Blanco-López, Agustin Costa-García, M Teresa Fernández-Abedul
This paper describes the development of simple, sustainable and low-cost strategies of signal enhancement on paper-based carbon platforms through gold nanoparticles electrogenerated from small volumes of tetrachloroauric acid solutions. Carbon ink is deposited in a hydrophilic working area of the paper delimited with hydrophobic wax. This maskless procedure is fast and cuts down ink waste. The connection of this working electrode to the potentiostat is ensured with the use of screen-printed electrodes (SPEs)...
May 22, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28530199/synthesis-of-ag-nps-impregnated-cellulose-composite-material-its-possible-role-in-wound-healing-and-photocatalysis
#3
Attarad Ali, Ihsan Ul Haq, Javeed Akhtar, Muhammad Sher, Naveed Ahmed, Muhammad Zia
Cellulose is the natural biopolymer normally used as supporting agent with enhanced applicability and properties. In present study, cellulose isolated from citrus waste is used for silver nanoparticles (Ag-NPs) impregnation by a simple and reproducible method. The Ag-NPs fabricated cellulose (Ag-Cel) was characterised by powder X-rays diffraction, Fortier transform infrared spectroscopy and scanning electron microscopy. The thermal stability was studied by thermo-gravimetric analysis. The antibacterial activity performed by disc diffusion assay reveals good zone of inhibition against Staphylococcus aureus and Escherichia coli by Ag-Cel as compared Ag-NPs...
June 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/28529679/new-era-of-electronic-brachytherapy
#4
EDITORIAL
Prabhakar Ramachandran
Traditional brachytherapy refers to the placement of radioactive sources on or inside the cancer tissues. Based on the type of sources, brachytherapy can be classified as radionuclide and electronic brachytherapy. Electronic brachytherapy uses miniaturized X-ray sources instead of radionuclides to deliver high doses of radiation. The advantages of electronic brachytherapy include low dose to organs at risk, reduced dose to treating staff, no leakage radiation in off state, less shielding, and no radioactive waste...
April 28, 2017: World Journal of Radiology
https://www.readbyqxmd.com/read/28528289/platelet-hyperactivation-apoptosis-and-hypercoagulability-in-patients-with-acute-pulmonary-embolism
#5
Samin Rezania, Michael A Puskarich, Daniela N Petrusca, Evandro M Neto-Neves, Matthew T Rondina, Jeffrey A Kline
Changes in systemic redox balance can alter platelet activation and aggregation. Acute pulmonary embolism (PE) is a systematic inflammatory disease associated with mechanical shear stress, increased thrombin, catecholamines, serotonin and hemolysis, which cumulatively can hyperactivate platelets and accelerate their turnover. We tested the hypothesis that platelets from patients with moderately severe PE will show hyperstimulation and a pre-apoptotic phenotype associated with microparticles (MPs) in plasma...
May 13, 2017: Thrombosis Research
https://www.readbyqxmd.com/read/28527738/life-cycle-assessment-of-sustainable-raw-material-acquisition-for-functional-magnetite-bionanoparticle-production
#6
Jhuma Sadhukhan, Nimisha Joshi, Mobolaji Shemfe, Jonathan R Lloyd
Magnetite nanoparticles (MNPs) have several applications, including use in medical diagnostics, renewable energy production and waste remediation. However, the processes for MNP production from analytical-grade materials are resource intensive and can be environmentally damaging. This work for the first time examines the life cycle assessment (LCA) of four MNP production cases: (i) industrial MNP production system; (ii) a state-of-the-art MNP biosynthesis system; (iii) an optimal MNP biosynthesis system and (iv) an MNP biosynthesis system using raw materials sourced from wastewaters, in order to recommend a sustainable raw material acquisition pathway for MNP synthesis...
May 17, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28521663/towards-a-generic-procedure-for-the-detection-of-relevant-contaminants-from-waste-electric-and-electronic-equipment-weee-in-plastic-food-contact-materials-review-and-selection-of-key-parameters
#7
Franky Puype, Jiří Samsonek, Věra Vilímková, Šárka Kopečková, Andrea Ratiborská, Jan Knoop, Marion Egelkraut-Holtus, Markus Ortlieb, Uwe Oppermann
Recently, traces of brominated flame retardants (BFRs) have been detected in black plastic food contact materials (FCMs) indicating the presence of recycled plastics, mainly coming from waste electric and electronic equipment (WEEE) as BFRs are one of the main additives in electric applications. In order to evaluate efficiently and preliminary in situ the presence of WEEE in plastic FCMs, a generic procedure for evaluation of WEEE presence in plastic FCMs by using defined parameters having each an associated importance level has been proposed...
May 18, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28521210/selective-thermal-transformation-of-old-computer-printed-circuit-boards-to-cu-sn-based-alloy
#8
Ali Shokri, Farshid Pahlevani, Ivan Cole, Veena Sahajwalla
This study investigates, verifies and determines the optimal parameters for the selective thermal transformation of problematic electronic waste (e-waste) to produce value-added copper-tin (Cu-Sn) based alloys; thereby demonstrating a novel new pathway for the cost-effective recovery of resources from one of the world's fastest growing and most challenging waste streams. Using outdated computer printed circuit boards (PCBs), a ubiquitous component of e-waste, we investigated transformations across a range of temperatures and time frames...
May 15, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28521151/intracellular-localization-and-toxicity-of-graphene-oxide-and-reduced-graphene-oxide-nanoplatelets-to-mussel-hemocytes-in-vitro
#9
Alberto Katsumiti, Radmila Tomovska, Miren P Cajaraville
Recently, graphene materials have attracted tremendous research interest due to their unique physicochemical properties that hold great promise in electronics, energy, materials and biomedical areas. Graphene oxide (GO) is one of the most extensively studied graphene derivatives. In order to improve GO electrical properties, nanoplatelets are chemically reduced, thus increasing nanoplatelet conductivity. This reduced GO (rGO) shows different properties and behavior compared to GO. Graphene-based wastes are expected to end up in the marine environment...
April 28, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28514712/nitrogen-doped-carbon-dots-derived-from-sargassum-fluitans-as-fluorophore-for-dna-detection
#10
S Godavarthi, K Mohan Kumar, E Vázquez Vélez, A Hernandez-Eligio, M Mahendhiran, N Hernandez-Como, M Aleman, L Martinez Gomez
This work focused on the use of waste seaweed Sargassum fluitans (S. fluitans) as carbon source precursor to prepare nitrogen doped carbon dots (NCDs) by hydrothermal method. High resolution transmission electron microscopic (HR-TEM) studies revealed that the synthesized water soluble NCDs are in the size range of 2-8nm and exhibits excellent fluorescent properties with a quantum yield of 18.2%. Elemental nitrogen in NCDs was evidenced by X-ray photoelectron spectroscopy (XPS) and Fourier transformed infrared spectrum (FT-IR)...
May 10, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28512455/non-edible-oil-cakes-as-a-novel-substrate-for-dpa-production-and-augmenting-biocontrol-activity-of-paecilomyces-variotii
#11
Kalpana Arora, Satyawati Sharma, Suresh B N Krishna, Jamila K Adam, Ashwani Kumar
The present study investigated the use of waste non-edible oil cakes (Jatropha, Karanja, Neem, and Mahua) as a substrate for the growth of Paecilomyces variotii and dipicolinic acid (DPA) production. Previous researches proved the efficacy of DPA in suppressing certain pathogens that are deleterious to the plants in the rhizosphere. DPA production was statistical optimized by amending non-edible oil cakes in growing media as nitrogen and sugars (Dextrose, Glucose, and Lactose) as carbon source. Plackett-Burman design (PBD), indicated that Jatropha cake, Karanja cake, and Dextrose were the most significant components (p < 0...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28511039/occurrence-composition-source-and-regional-distribution-of-halogenated-flame-retardants-and-polybrominated-dibenzo-p-dioxin-dibenzofuran-in-the-soils-of-guiyu-china
#12
Pengjun Xu, Bu Tao, Zhiguang Zhou, Shuang Fan, Ting Zhang, Aimin Liu, Shuping Dong, Jingli Yuan, Hong Li, Jiping Chen, Yeru Huang
Guiyu, China, is well-known for the crude disposal of electronic waste (EW) and severe persistent organic pollutants (POPs). Therefore, in this study, the occurrence, composition, and source of polybrominated diphenyl ethers (PBDEs), 2,2',4,4',5,5'-hexabromobiphenyl (BB153), some novel brominated flame retardants (NBFRs), Dechlorane Plus (DP) and polybrominated dibenzo-p-dioxins/dibenzofurans (PBDD/Fs) in farmland soils covering Guiyu were studied. In EW disposal area soils, PBDEs were the most abundant FRs, with concentrations of 13-1014 ng g(-1)...
May 13, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28510421/converting-carbohydrates-to-carbon-based-photocatalysts-for-environmental-treatment
#13
Zhuofeng Hu, Zhurui Shen, Jimmy Chai Mei Yu
Carbohydrates in biomass can be converted to semiconductive hydrothermal carbonation carbon (HTCC), a material that contains plenty of sp2-hybridization structures. Under solar light illumination, HTCC generates photoexcited electrons, holes and hydroxyl radicals. These species can be used for photocatalytic treatment such as water disinfection and degradation of organic pollutants. The photocatalytic activity of HTCC can be significantly enhanced by iodine doping. The enhancement mechanism is investigated by density functional theoretical calculations and electrochemical measurements...
May 16, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28506669/recycling-and-characterization-of-carbon-fibers-from-carbon-fiber-reinforced-epoxy-matrix-composites-by-a-novel-super-heated-steam-method
#14
Kwan-Woo Kim, Hye-Min Lee, Jeong-Hun An, Dong-Chul Chung, Kay-Hyeok An, Byung-Joo Kim
In order to manufacture high quality recycled carbon fibers (R-CFs), carbon fiber-reinforced composite wastes were pyrolysed with super-heated steam at 550 °C in a fixed bed reactor for varying reaction times. The mechanical and surface properties of the R-CFs were characterized with a single fiber tensile test, interface shear strength (IFSS), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The surface analysis showed that there was no matrix char residue on the fiber surfaces...
May 12, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28505070/characterization-of-fine-metal-particles-derived-from-shredded-weee-using-a-hyperspectral-image-system-preliminary-results
#15
Gabriele Candiani, Nicoletta Picone, Loredana Pompilio, Monica Pepe, Marcello Colledani
Waste of electric and electronic equipment (WEEE) is the fastest-growing waste stream in Europe. The large amount of electric and electronic products introduced every year in the market makes WEEE disposal a relevant problem. On the other hand, the high abundance of key metals included in WEEE has increased the industrial interest in WEEE recycling. However, the high variability of materials used to produce electric and electronic equipment makes key metals' recovery a complex task: the separation process requires flexible systems, which are not currently implemented in recycling plants...
May 13, 2017: Sensors
https://www.readbyqxmd.com/read/28504133/nanofibrillation-of-deep-eutectic-solvent-treated-paper-and-board-cellulose-pulps
#16
Terhi Suopajärvi, Juho Antti Sirviö, Henrikki Liimatainen
In this work, several cellulose board grades, including waste board, fluting, and waste milk container board, were pretreated with green choline chloride-urea deep eutectic solvent (DES) and nanofibrillated using a Masuko grinder. DES-treated bleached chemical birch pulp, NaOH-swollen waste board, and bleached chemical birch pulp were used as reference materials. The properties of the nanofibrils after disc grinding were compared with those obtained through microfluidization. Overall, the choline chloride-urea DES pretreatment significantly enhanced the nanofibrillation of the board pulps in both nanofibrillation methods-as compared with NaOH-treated pulps-and resulted in fine and long individual nanofibrils and some larger nanofibril bunches, as determined by field emission scanning electron microscopy and transmission electron microscopy...
August 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28501201/waste-derivitized-blue-luminescent-carbon-quantum-dots-for-selenite-sensing-in-water
#17
Pooja Devi, Gurvinder Kaur, Anupma Thakur, Navneet Kaur, Anita Grewal, Praveen Kumar
Herein, we report an environmental friendly, facile, and completely green synthetic method for producing carbon quantum dots (CQDs) from whey, a major dairy waste. The as-prepared monodispersed diameter CQDs exhibit blue luminescence with noteworthy quantum yield (~11.4%) and excitation dependent emission behaviour. Nuclear magnetic resonance (NMR) analysis reveals the presence of aromatized carbon peaks, leading to polymerized CQDs diameter architecture during whey pyrolysis. The X-ray and selected area electron diffraction patterns confirm their amorphous nature...
August 1, 2017: Talanta
https://www.readbyqxmd.com/read/28495055/production-and-characterization-of-chars-from-cherry-pulp-via-pyrolysis
#18
E Pehlivan, N Özbay, A S Yargıç, R Z Şahin
Pyrolysis is an eco-friendly process to achieve valuable products like bio-oil, char and gases. In the last decades, biochar production from pyrolysis of a wide variety of industrial and agricultural wastes become popular, which can be utilized as adsorbent instead of the expensive activated carbons. In this study, cherry pulp was pyrolyzed in a fixed bed tubular reactor at five different temperatures (400, 500,550, 600 and 700 °C) and three different heating rates (10, 100 and 200 °C/min) to obtain biochar...
May 7, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28494420/egg-shell-waste-as-heterogeneous-nanocatalyst-for-biodiesel-production-optimized-by-response-surface-methodology
#19
Priti R Pandit, M H Fulekar
Worldwide consumption of hen eggs results in availability of large amount of discarded egg waste particularly egg shells. In the present study, the waste shells were utilized for the synthesis of highly active heterogeneous calcium oxide (CaO) nanocatalyst to transesterify dry biomass into methyl esters (biodiesel). The CaO nanocatalyst was synthesied by calcination-hydration-dehydration technique and fully characterized by infrared spectroscopy, X-ray powder diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), brunauer-emmett-teller (BET) elemental and thermogravimetric analysis...
May 6, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28494363/reductive-solidification-stabilization-of-chromate-in-municipal-solid-waste-incineration-fly-ash-by-ascorbic-acid-and-blast-furnace-slag
#20
Xian Zhou, Min Zhou, Xian Wu, Yi Han, Junjun Geng, Teng Wang, Sha Wan, Haobo Hou
Fly ash is a hazardous byproduct of municipal solid waste incineration (MSWI). Cementitious material that is based on ground-granulated blast furnace slag (GGBFS) has been tested and proposed as a binder to stabilize Pb, Cd, and Zn in MSWI fly ash (FA). Cr, however, still easily leaches from MSWI FA. Different reagents, such as ascorbic acid (VC), NaAlO2, and trisodium salt nonahydrate, were investigated as potential Cr stabilizers. The results of the toxicity characteristic leaching procedure (TCLP) showed that VC significantly improved the stabilization of Cr via the reduction of Cr(VI) to Cr(III)...
April 21, 2017: Chemosphere
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