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https://www.readbyqxmd.com/read/28551875/non-ureolytic-calcium-carbonate-precipitation-by-lysinibacillus-sp-ys11-isolated-from-the-rhizosphere-of-miscanthus-sacchariflorus
#1
Yun Suk Lee, Hyun Jung Kim, Woojun Park
Although microbially induced calcium carbonate precipitation (MICP) through ureolysis has been widely studied in environmental engineering fields, urea utilization might cause environmental problems as a result of ammonia and nitrate production. In this study, many non-ureolytic calcium carbonate-precipitating bacteria that induced an alkaline environment were isolated from the rhizosphere of Miscanthus sacchariflorus near an artificial stream and their ability to precipitate calcium carbonate minerals with the absence of urea was investigated...
June 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28551517/binding-sno2-nanoparticles-onto-carbon-nanotubes-with-assistance-of-amorphous-moo3-towards-enhanced-lithium-storage-performance
#2
Daxian Cao, Hangyu Gu, Chong Xie, Beibei Li, Hongkang Wang, Chunming Niu
We report the synthesis of a novel SnO2/MoO3/carbon nanotubes (CNTs) hybrid (denote as SMC) via hydrothermally treating aqueous SnCl4-Na2MoO4-CNTs suspension. The hydrolysis of SnCl4 promotes the precipitation of Na2MoO4, resulting in the simultaneous coprecipitation of the amorphous MoO3 and SnO2 nanoparticles which attach onto the CNTs (Note that no MoOx is produced in the absence of SnCl4). When used as anode materials for lithium ion batteries (LIBs), the as-prepared SMC hybrid delivers a high reversible capacities of 1032 and 887mAh/g after 50 cycles at current densities of 200 and 500mA/g, respectively, and still retains a reversible capacity of 496mAh/g even after 200 cycles at a higher rate of 2A/g, which shows much better lithium storage performance than that of the counterpart hybrid of SnO2/CNTs (denote as SC, with only 569mAh/g after 50 cycles at 200mA/g)...
May 20, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28550949/freshwater-lenses-as-ecological-and-population-sustenance-case-study-in-the-coastal-wetland-of-samboromb%C3%A3-n-bay-argentina
#3
Carolina Tanjal, Eleonora Carol, Sebastián Richiano, Lucía Santucci
Freshwater lenses associated to shell ridges and sand sheets exist on the coastal wetland of Samborombón Bay. As they constitute one of the most vulnerable aquifer systems, it is the aim of this study to determine the hydrogeochemical processes that condition the chemical quality of its groundwater and to assess their present and future capability as sustenance of native woods and local villagers. To achieve this, hydrogeomorphological field surveys were made and groundwater samples were taken. Results show that lenses have a mean thickness of 12m and its chemical quality depends on the dissolution of CO2(g) and carbonates, weathering of silicates and ion exchange...
May 24, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28550768/photochemical-studies-of-cis-ru-bpy-2-4-bzpy-co-pf6-2-and-cis-ru-bpy-2-4-bzpy-cl-pf6-blue-light-induced-nucleobase-binding
#4
Aurideia P de Sousa, Edinilton M Carvalho, Javier Ellena, Eduardo H S Sousa, Jackson R de Sousa, Luiz G F Lopes, Peter C Ford, Alda K M Holanda
The ruthenium(II) compounds cis-[Ru(bpy)2(4-bzpy)(CO)](PF6)2 (I) and cis-[Ru(bpy)2(4-bzpy)(Cl)](PF6) (II) (4-bzpy=4-benzoylpyridine, bpy=2,2'-bipyridine) were synthesized and characterized by spectroscopic and electrochemical techniques. The crystal structure of II was determined by X-ray diffraction. The photochemical behavior of I in aqueous solution shows that irradiation with ultraviolet light (365nm) releases both CO and 4-bzpy leading to the formation of the cis-[Ru(bpy)2(H2O)2](2+) ion as identified by NMR and electronic spectroscopy...
May 15, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28549716/automated-programmable-pressurized-carbonic-acid-eluent-ion-exclusion-chromatography-of-organic-acids
#5
C Phillip Shelor, Purnendu K Dasgupta
Conductometric ion exclusion chromatography of weak acids does not enjoy the same degree of success as its counterpart in suppressed conductometric anion exchange chromatography. Compared to the latter, eluent preparation is not automated. Commonly, a strong acid is used as the eluent leading to a relatively high-detector background and poorer limits of detection. In addition, generally applicable gradient elution has not been possible. We introduce the automated preparation of carbonic acid eluents at concentrations exceeding 0...
May 16, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28549212/synthesis-of-four-monoterpene-derived-organosulfates-and-their-quantification-in-atmospheric-aerosol-samples
#6
Yuchen Wang, Jingyun Ren, X H Hilda Huang, Rongbiao Tong, Jian Zhen Yu
Monoterpenes, a major class of biogenic volatile organic compounds, are known to produce oxidation products that further react with sulfate to form organosulfates. The accurate quantification of monoterpene-derived organosulfates (OSs) is necessary for quantifying this controllable aerosol source; however, it has been hampered by a lack of authentic standards. Here we report a unified synthesis strategy starting from the respective monoterpene through Upjohn dihydroxylation or Sharpless asymmetric dihydroxylation followed by mono-sulfation with sulfur trioxide-pyridine complex...
May 26, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28546425/the-first-crystal-structure-of-a-family-129-glycoside-hydrolase-from-a-probiotic-bacterium-reveals-critical-residues-and-metal-co-factors
#7
Mayo Sato, Dorothee Liebschner, Yusuke Yamada, Naohiro Matsugaki, Takatoshi Arakawa, Siobhan S Wills, Mitchell Hattie, Keith A Stubbs, Tasuku Ito, Toshiya Senda, Hisashi Ashida, Shinya Fushinobu
The α-N-acetylgalactosaminidase from the probiotic bacterium Bifidobacterium bifidum (NagBb) belongs to the glycoside hydrolase (GH) family 129 and hydrolyzes the glycosidic bond of Tn antigen (GalNAcα1-Ser/Thr). NagBb is involved in assimilation of O-glycans on mucin glycoproteins by B. bifidum in the human gastrointestinal tract, but its catalytic mechanism has remained elusive because of a lack of sequence homology around putative catalytic residues and of other structural information. Here we report the X-ray crystal structure of NagBb, representing the first GH129 family structure, solved by the single-wavelength anomalous dispersion method based on sulfur atoms of the native protein...
May 25, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28545299/designing-pseudocapacitance-for-nb2o5-carbide-derived-carbon-electrodes-and-hybrid-devices
#8
Chun-Han Lai, David Ashby, Melissa K Moz, Yury Gogotsi, Laurent Pilon, Bruce S Dunn
Composite structures for electrochemical energy storage are prepared based on using the high rate lithium-ion insertion properties of Nb2O5. The Nb2O5 anchored on reduced graphene oxide (rGO) by hydrothermal synthesis to improve charge transfer properties and, by controlling surface charge, the resulting Nb2O5-rGO particles are attached to a high surface area carbide-derived carbon scaffold without blocking its exfoliated layers. The electrochemical results are analyzed using a recently published multi-scale physics model that provides significant insights regarding charge storage kinetics...
May 25, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28544937/recycling-metals-from-lithium-ion-battery-by-mechanical-separation-and-vacuum-metallurgy
#9
Jiefeng Xiao, Jia Li, Zhengming Xu
The large-batch application of lithium ion batteries leads to the mass production of spent batteries. So the enhancement of disposal ability of spent lithium ion batteries is becoming very urgent. This study proposes an integrated process to handle bulk spent lithium manganese (LiMn2O4) batteries to in situ recycle high value-added products without any additives. By mechanical separation, the mixed electrode materials mainly including binder, graphite and LiMn2O4 are firstly obtained from spent batteries. Then, the reaction characteristics for the oxygen-free roasting of mixed electrode materials are analyzed...
May 17, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28544389/bimetal-organic-framework-derivation-of-ball-cactus-like-ni-sn-p-c-cnt-as-long-cycle-anode-for-lithium-ion-battery
#10
Ruoling Dai, Weiwei Sun, Li-Ping Lv, Minghong Wu, Hao Liu, Guoxiu Wang, Yong Wang
Metal phosphides are a new class of potential high-capacity anodes for lithium ion batteries, but their short cycle life is the critical problem to hinder its practical application. A unique ball-cactus-like microsphere of carbon coated NiP2 /Ni3 Sn4 with deep-rooted carbon nanotubes (Ni-Sn-P@C-CNT) is demonstrated in this work to solve this problem. Bimetal-organic-frameworks (BMOFs, Ni-Sn-BTC, BTC refers to 1,3,5-benzenetricarboxylic acid) are formed by a two-step uniform microwave-assisted irradiation approach and used as the precursor to grow Ni-Sn@C-CNT, Ni-Sn-P@C-CNT, yolk-shell Ni-Sn@C, and Ni-Sn-P@C...
May 22, 2017: Small
https://www.readbyqxmd.com/read/28541945/application-of-scallop-shell-fe3o4-nanoparticles-for-the-removal-of-cr-vi-from-aqueous-solutions
#11
Azita Mohagheghian, Robabeh Vahidi-Kolur, Melina Pourmohseni, Jae-Kyu Yang, Mehdi Shirzad-Siboni
In this study, removal of Cr(VI) by Scallop shell-Fe3O4 nanoparticles was investigated with variation of pH, adsorbent dosage, initial Cr(VI) concentration, ionic strength and temperature. Coating of Fe3O4 nanoparticles onto Scallop shell was identified by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and energy dispersive X-ray analysis. The maximum adsorption was observed at pH 3. Removal efficiency of Cr(VI) was increased with increasing adsorbent dosage, but was decreased with increasing initial Cr(VI) concentration and temperature...
May 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28541654/stable-1t-mose2-and-carbon-nanotubes-hybridized-flexible-film-binder-free-and-high-performance-li-ion-anode
#12
Ting Xiang, Shi Tao, Weiyu Xu, Qi Fang, Chuanqiang Wu, Daobin Liu, Yu Zhou, Adnan Khalil, Zahir Muhammad, Wangsheng Chu, Zhonghui Wang, Hongfa Xiang, Qin Liu, Li Song
Two-dimensional stable metallic 1T-MoSe2 with expanded interlayer spacing of 10.0 Å in-situ grown on SWCNTs film is fabricated via a one-step solvothermal method. Combined with X-ray absorption near-edge structures, our characterizations reveals that such 1T-MoSe2 and single-walled carbon nanotubes (abbreviated as 1T-MoSe2/SWCNTs) hybridized structure can provide strong electrical and chemical coupling between 1T-MoSe2 nanosheets and SWCNTs film in a form of C-O-Mo bonding, which is significantly benefiting a high-efficiency electron/ion transport pathway and structural stability, thus directly enabling high performance lithium-storage properties...
May 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/28540940/modelling-charge-transfer-processes-in-c-2-tetrahydrofuran-collision-for-ion-induced-radiation-damage-in-dna-building-blocks
#13
Ewa Erdmann, Marie-Christine Bacchus-Montabonel, Marta Łabuda
Investigations of collision-induced processes involving carbon ions and molecules of biological interest, in particular DNA building blocks, are crucial to model the effect of radiation on cells in order to improve medical treatments for cancer therapy. Using carbon ions appears to be one of the most efficient ways to increase biological effectiveness to damage cancerous cells by irradiating deep-seated tumors. Therefore, interest in accurate calculations to understand fundamental processes occurring in ion-molecule collision systems has been growing recently...
May 25, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28540557/dissolution-of-steel-slags-in-aqueous-media
#14
Shashikant Yadav, Anurag Mehra
Steel slag is a major industrial waste in steel industries, and its dissolution behavior in water needs to be characterized in the larger context of its potential use as an agent for sequestering CO2. For this purpose, a small closed system batch reactor was used to conduct the dissolution of steel slags in an aqueous medium under various dissolution conditions. In this study, two different types of steel slags were procured from steel plants in India, having diverse structural features, mineralogical compositions, and particle sizes...
May 25, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28540379/fundamental-aspects-of-electrochemically-controlled-wetting-of-nanoscale-composite-materials
#15
A Robert Hillman, Karl S Ryder, Hani K Ismail, Asuman Unal, Annelies Voorhaar
Electroactive films based on conducting polymers have numerous potential applications, but practical devices frequently require a combination of properties not met by a single component. This has prompted an extension to composite materials, notably those in which particulates are immobilised within a polymer film. Irrespective of the polymer and the intended application, film wetting is important: by various means, it facilitates transport processes - of electronic charge, charge-balancing counter ions ("dopant") and analyte/reactant molecules - and motion of polymer segments...
May 25, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28537377/enhanced-lithium-and-sodium-ion-storage-in-an-interconnected-carbon-network-comprising-electronegative-fluorine
#16
Seok-Min Hong, Vinodkumar Etacheri, Chulgi Nathan Hong, Seung Wan Choi, Ki Bong Lee, Vilas G Pol
Fluorocarbon (CxFy) anode materials were developed for lithium- and sodium-ion batteries through a facile one-step carbonization of a single precursor, polyvinylidene fluoride (PVDF). Interconnected carbon network structures were produced with doped fluorine in high-temperature carbonization at 500-800 °C. The fluorocarbon anodes derived from the PVDF precursor showed higher reversible discharge capacities of 735 mAh g(-1) and 269 mAh g(-1) in lithium- and sodium-ion batteries, respectively, compared to the commercial graphitic carbon...
May 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28537375/flexible-and-wearable-fiber-micro-supercapacitors-based-on-carbon-nanotube-agarose-gel-composite-electrodes
#17
Sung Kon Kim, Hyung-Jun Koo, Jinyun Liu, Paul V Braun
Fiber electrodes provide interesting opportunities for energy storage by providing both mechanical flexibility and the opportunity to impart multifunctionality to fabrics. We show here carbon nanotube (CNTs)-embedded agarose gel composite fiber electrodes with a diameter of ~120 μm consisting of 60 wt% CNTs that can serve as the basis for flexible and wearable fiber micro-supercapacitors (mSCs). Via an extrusion process, CNT bundles are induced to align in an agarose filament matrix. Due to the shear alignment of the CNT bundles, the dehydrated filaments have an electrical conductivity as high as 8...
May 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28537308/catalytically-active-ceria-supported-cobalt-manganese-oxide-nanocatalysts-for-oxidation-of-carbon-monoxide
#18
Xu Wang, Lin-Ying Du, Meng Du, Chao Ma, Jie Zeng, Chun-Jiang Jia, Rui Si
A low-concentration cobalt (∼6 at%) and manganese (∼3 at%) bimetallic oxide catalyst supported on ceria nanorods (CoMnOx/CeO2), as well as its related single metal oxide counterparts (CoOx/CeO2 and MnOx/CeO2) was synthesized via a deposition-precipitation approach. The fresh samples after air-calcination at 400 °C were tested under the reaction conditions of CO oxidation, and showed the following order of reactivity: CoMnOx/CeO2 > CoOx/CeO2 > MnOx/CeO2. X-ray diffraction (XRD) and transmission electron microscopy (TEM) data identified that the structure of the CeO2 support was maintained during deposition of metal (Co, Mn) ions while the corresponding vis-Raman spectra verified that more oxygen vacancies were created after deposition-precipitation than those in pure ceria nanorods...
May 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28537079/green-water-dispersible-photoluminescent-on-off-on-probe-for-selective-detection-of-fluoride-ions
#19
Pallavi Singhal, Bal Govind Vats, Sanjay Kumar Jha, Suman Neogy
Considering the high toxicity and widespread availability of fluoride ion in different environmental matrices, it is imperative to design a probe for its detection. In view of this a selective fluorescent on-off-on probe based on carbon quantum dots (CQDs) and Eu3+ has been designed. We have synthesized water soluble carboxylic acid functionalized CQDs and monitored its interaction with Eu3+. On addition of Eu3+ ions luminescence quenching in CQDs emission was observed (switch-off). We investigate the reason for this luminescence quenching using time resolved emission and high resolution transmission electron microscopy (HRTEM) studies and observed that both electron transfer from CQDs to Eu3+ and aggregation of CQDs are responsible for luminescence quenching...
May 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28535963/usefulness-of-11-c-methionine-pet-for-predicting-the-efficacy-of-carbon-ion-radiation-therapy-for-head-and-neck-mucosal-malignant-melanoma
#20
M Hasebe, K Yoshikawa, R Nishii, K Kawaguchi, T Kamada, Y Hamada
The aim of this study was to determine whether l-methyl-[(11)C]-methionine (MET) positron emission tomography (PET) allows the prediction of outcomes in patients with head and neck mucosal malignant melanoma treated with carbon ion radiation therapy (CIRT). This was a retrospective cohort study involving 85 patients who underwent a MET-PET or MET-PET/computed tomography (CT) examination before and after CIRT. MET uptake in the tumour was evaluated semi-quantitatively using the tumour-to-normal tissue ratio (TNR)...
May 20, 2017: International Journal of Oral and Maxillofacial Surgery
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