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https://www.readbyqxmd.com/read/28805213/oxalate-assisted-formation-of-uniform-carbon-confined-sno2-nanotubes-with-enhanced-lithium-storage
#1
Chunhua Han, Baoxuan Zhang, Kangning Zhao, Jiashen Meng, Qiu He, Pan He, Wei Yang, Qi Li, Liqiang Mai
SnO2 nanotubes are synthesized via an oxalate-assisted "redox etching and precipitating" route between MnOOH nanowires and Sn(2+) ions. The addition of oxalate is found to be crucial to guide the formation of uniform SnO2 nanotubes. To further improve the conductivity and stability, the as-obtained SnO2 nanotubes are coated with a thin carbon layer. The resulting carbon-confined SnO2 nanotubes possess superior rate performance as an anode material for lithium-ion batteries.
August 14, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28800695/long-term-impact-of-manuring-and-fertilization-on-enrichment-stability-and-quality-of-organic-carbon-in-inceptisol-under-two-potato-based-cropping-systems
#2
R K Yadav, T J Purakayastha, M A Khan, S C Kaushik
Soil organic matter (SOM) stability is a prerequisite for long-term C sequestration. The long-term effect of manuring and fertilization on stability of SOM in rice-potato-wheat (R-P-W) and maize-potato-onion (M-P-O) cropping systems was studied in an Inceptisol of semi-arid subtropical India. Soil samples were collected (0-15 and 15-30cm soil depths) from the following treatments: control, 100% NPK-Fertilizer, 100% N-Vermicompost (VC), 50% NPK-Fertilizer+50%N-Vermicompost (VC), 100%NPK-Fertilizer+crop residue (CR), 100% N-VC+CR...
August 7, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28800536/fate-of-metals-before-and-after-chemical-extraction-of-incinerated-sewage-sludge-ash
#3
Jiang-Shan Li, Daniel C W Tsang, Qi-Ming Wang, Le Fang, Qiang Xue, Chi Sun Poon
Chemical extraction of incinerated sewage sludge ash (ISSA) can effectively recycle P, but it may change the speciation and mobility of the remaining metals. This study investigated the changes of the leaching potential and distribution of metals in the chemically extracted ISSA. Batch extraction experiments with different extractants, including inorganic acids, organic acids, and chelating agents, were conducted on the ISSA collected from a local sewage sludge incinerator. The extraction of Zn, Cu, Pb, Ni, Cd, Ba, Cr and As from the ISSA and the corresponding changes of the mobility and speciation were examined...
August 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/28797789/dry-mechanochemical-synthesis-of-caffeine-oxalic-acid-cocrystals-and-their-evaluation-by-powder-x-ray-diffraction-and-chemometrics
#4
Yuta Otsuka, Akira Ito, Masaki Takeuchi, Hideji Tanaka
We report the effects of dry mechanochemical synthesis conditions on the crystallization of caffeine and oxalic acid 2:1 cocrystal. Caffeine anhydrate (CA) and oxalic acid (OX) dihydrate were grinded at various temperatures, rotation speeds and grinding time. The cocrystal was also synthesized by an organic solvent evaporation method, as a reference. The produced samples were measured by a powder X-ray diffraction (PXRD) analysis. The PXRD spectra suggest that the grinded cocrystal has a lower crystallinity than the evaporated one...
August 7, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28797210/removal-of-methyl-orange-by-heterogeneous-fenton-catalysts-prepared-using-glycerol-as-green-reducing-agent
#5
Natália S F Trotte, M Alzamora, D R Sánchez, Nakédia M F Carvalho
This study aims to prepare environmentally friendly iron catalysts supported on silica, using glycerol as green reducing and stabilizing agent, for application in heterogeneous Fenton degradation of the pollutant dye methyl orange. The catalysts were characterized by XRD, AAS, SEM, TEM, thermogravimetric analyses, Mössbauer and FTIR spectroscopies, which revealed the formation of iron(II)/(III) oxalates from the oxidation of glycerol by the iron(III) nitrate precursor. Besides, iron oxihydroxide nanoparticles with superparamagnetic behavior were also formed...
August 10, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28797118/effect-of-trichoderma-enriched-organic-charcoal-in-the-integrated-wood-protection-strategy
#6
Javier Ribera, Mónica Gandía, Jose F Marcos, Maria Del Carmen Bas, Siegfried Fink, Francis W M R Schwarze
The gradual elimination of chromium from wood preservative formulations results in higher Cu leaching and increased susceptibility to wood decay fungi. Finding a sustainable strategy in wood protection has become of great interest among researchers. The objective of these in vitro studies was to demonstrate the effect of T-720-enriched organic charcoal (biochar) against five wood decay basidiomycetes isolated from strongly damaged poles. For this purpose, the antagonistic potential of Trichoderma harzianum (strain T-720) was confirmed among other four Trichoderma spp...
2017: PloS One
https://www.readbyqxmd.com/read/28796288/a-novel-topical-agent-in-the-treatment-of-seborrheic-keratoses-a-proof-of-concept-study-by-clinical-and-dermoscopic-evaluation
#7
Francesco Lacarrubba, Maria Rita Nasca, Anna Elisa Verzì, Giuseppe Micali
In this proof of concept study, 50 lesions from 15 patients with multiple seborrheic keratoses (SKs) were treated with a novel aqueous solution containing nitric acid, zinc and copper salts, and organic acids (acetic, lactic, and oxalic acid). Treatment consisted in the application of an amount of the solution sufficient to obtain a whitening/yellowish reaction. Application of the nitric-zinc solution was performed every other week until clinical and dermoscopic clearance or crust formation, for a maximum of 4 applications...
August 10, 2017: Dermatologic Therapy
https://www.readbyqxmd.com/read/28792743/a-paradigm-shift-for-preparing-versatile-m2-free-gels-from-unmodified-sodium-alginate
#8
Maria M Pérez-Madrigal, Juan Torras, Jordi Casanovas, Marleen Häring, Carlos Aleman, David Díaz Díaz
This manuscript describes a new route to prepare rapidly Ca2+-free hydrogels from unmodified sodium alginate by simply mixing with small organic molecules such as polycarboxylic acid compounds as cross-linker agents instead of classical divalent metal salts such as CaCl2. DMSO was also found to induce the rapid gelation of aqueous alginate solutions. The gelation process takes place at RT and depending on the composition, gels with good thermal (90-100 °C) and mechanical properties compared to classical metal-containing analogs are obtained...
August 9, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28783796/metal-immobilization-on-wood-derived-biochars-distribution-and-reactivity-of-carbonate-phases
#9
Frédéric Rees, Françoise Watteau, Sandrine Mathieu, Marie-Pierre Turpault, Yann Le Brech, Rongliang Qiu, Jean Louis Morel
Metals can be immobilized on biochars by precipitation with carbonate. The distribution of metal-carbonate phases at the surface of biochars and the conditions of their formation, however, are unknown. Electron microscopy and X-photon spectroscopy were used to characterize carbonate phases in various morphological groups of particles of a wood-derived biochar, both before and after a metal-sorption experiment. Our results showed that the distribution of metals at the surface of biochar particles depended on the corresponding wood tissues and the presence of carbonate phases...
July 2017: Journal of Environmental Quality
https://www.readbyqxmd.com/read/28783611/control-of-arsenic-mobilization-in-paddy-soils-by-manganese-and-iron-oxides
#10
Xiaowei Xu, Chuan Chen, Peng Wang, Ruben Kretzschmar, Fang-Jie Zhao
Reductive mobilization of arsenic (As) in paddy soils under flooded conditions is an important reason for the relatively high accumulation of As in rice, posing a risk to food safety and human health. The extent of As mobilization varies widely among paddy soils, but the reasons are not well understood. In this study, we investigated As mobilization in six As-contaminated paddy soils (total As ranging from 73 to 122 mg kg(-1)) in flooded incubation and pot experiments. Arsenic speciation in the solution and solid phases were determined...
August 4, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28783129/effects-of-oxalic-acid-on-apis-mellifera-hymenoptera-apidae
#11
Eva Rademacher, Marika Harz, Saskia Schneider
Abstract: Oxalic acid dihydrate is used to treat varroosis of Apis mellifera. This study investigates lethal and sublethal effects of oxalic acid dihydrate on individually treated honeybees kept in cages under laboratory conditions as well as the distribution in the colony. After oral application, bee mortality occurred at relatively low concentrations (No Observed Adverse Effect Level (NOAEL) 50 µg/bee; Lowest Observed Adverse Effect Level (LOAEL) 75 µg/bee) compared to the dermal treatment (NOAEL 212.5 µg/bee; LOAEL 250 µg/bee)...
August 7, 2017: Insects
https://www.readbyqxmd.com/read/28780598/optimization-of-monomethoxy-polyethyleneglycol-modified-oxalate-decarboxylase-by-response-surface-methodology
#12
Han Long, XingHua Cai, Hui Yang, JunBin He, Jia Wu, RiHui Lin
In order to improve the stability of oxalate decarboxylase (Oxdc), response surface methodology (RSM), based on a four-factor three-level Box-Behnken central composite design was used to optimize the reaction conditions of oxalate decarboxylase (Oxdc) modified with monomethoxy polyethyleneglycol (mPEG5000). Four independent variables such as the ratio of mPEG-aldehyde to Oxdc, reaction time, temperature, and reaction pH were investigated in this work. The structure of modified Oxdc was identified by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and Fourier transform infrared (FTIR) spectroscopy, the stability of the modified Oxdc was also investigated...
August 5, 2017: Journal of Biological Physics
https://www.readbyqxmd.com/read/28778015/mineralization-of-aniline-using-hydroxyl-sulfate-radical-based-technology-in-a-waterfall-reactor
#13
A Durán, J M Monteagudo, I San Martín, F J Amunategui, D A Patterson
The aim of this work is to study the applicability of a UV/H2O2 process intensified with persulfate (PS) as a source of SO4(-) radicals to efficiently mineralize a synthetic effluent containing aniline in a glass reactor arranged in a cascade configuration. pH conditions were studied and the concentration of PS was optimized. The synergism for aniline mineralization between the UV/H2O2 process and the combined UV/H2O2/PS process was quantified in 10.1%. Aniline degradation reached 100% under the UV/H2O2/PS process after 20 min...
July 29, 2017: Chemosphere
https://www.readbyqxmd.com/read/28777746/characterization-of-breast-calcification-types-using-dual-energy-x-ray-method
#14
Niki Martini, Vaia Koukou, George Fountos, Christos Michail, Athanasios Bakas, Ioannis S Kandarakis, Robert David Speller, George C Nikiforidis
Calcifications are products of mineralization whose presence is usually associated with pathological conditions. The minerals mostly seen in several diseases are calcium oxalate (CaC2O4), calcium carbonate (CaCO3) and hydroxyapatite (HAp). Up to date, there is no in-vivo method that could discriminate between minerals. To this aim, a dual energy X-ray method was developed in the present study. An analytical model was implemented for the determination of the Calcium/Phosphorus mass ratio (mca/mp ). The simulation was carried out using monoenergetic and polyenergetic X-rays and various calcification thicknesses (100 to 1000 um) and types (CaC2O4, CaCO3, HAp)...
August 4, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28776624/determination-of-the-field-strength-and-realization-of-the-high-field-anodization-of-aluminum
#15
Ji Xing, Sitong Lu, Chi Zhang, Min Yin, Dongdong Li, Ye Song
Previous studies suggested that high-field anodization of aluminum can be realized given that aluminum is anodized at a high voltage just below the breakdown value. However, increasing the applied voltage cannot guarantee the enhancement in electric field strength across the barrier layer of porous anodic alumina (PAA) due to a concurrent increase of the barrier-layer thickness. Here, we report comparative studies of aluminum anodization in a highly concentrated (0.75 M) and a dilute (0.1 M) oxalic acid solution...
August 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28776346/chronological-trends-in-clinical-and-urinary-metabolic-features-over-20-years-in-korean-urolithiasis-patients
#16
Ho Won Kang, Sung Pil Seo, Yun Sok Ha, Won Tae Kim, Yong June Kim, Seok Joong Yun, Wun Jae Kim, Sang Cheol Lee
Urolithiasis is common and is becoming more prevalent worldwide. This study assessed the chronological trends in clinical and urinary metabolic features over 20 years in Korean urolithiasis patients. We performed a retrospective analysis of 4,076 patients treated at our clinic from 1996 to 2015. Urinary metabolic data and stone analysis data were available for 1,421 and 723 patients (34.9% and 17.7%), respectively. Patients were categorized into 4 groups according to the date of initial diagnosis: group 1 (1996-2000, n = 897), group 2 (2001-2005, n = 1,018), group 3 (2006-2010, n = 1,043), and group 4 (2011-2015, n = 1,118)...
September 2017: Journal of Korean Medical Science
https://www.readbyqxmd.com/read/28776297/physiological-mechanisms-of-a-wetland-plant-echinodorus-osiris-rataj-to-cadmium-detoxification
#17
Peng Zhang, He Huang, Wanru Liu, Chaolan Zhang
Physiological responses of Echinodorus osiris Rataj plant under cadmium (Cd) stress (5 and 15 mg L(-1)) were studied by researching the change of non-enzymatic antioxidants and the exudation of root organic acids. There was a significant increase of ascorbic acid, glutathione, and non-protein thiols in the plant, and the increment was much obvious in roots than that in leaves with increased Cd stress. The accumulation of Cd was associated with mitochondrial structural damages in roots, while the organelle structure, such as chloroplast, in leaves remains intact...
August 3, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28776078/sarna-mediated-activation-of-trpv5-reduces-renal-calcium-oxalate-deposition-in-rat-via-decreasing-urinary-calcium-excretion
#18
Tao Zeng, Xiaolu Duan, Wei Zhu, Yang Liu, Wenqi Wu, Guohua Zeng
Hypercalciuria is a main risk factor for kidney stone  formation. TRPV5 is the gatekeeper protein for mediating calcium transport and reabsorption in the kidney. In the present study, we tested the effect of TRPV5 activation with small activating RNA (saRNA), which could induce gene expression by targeting the promoter of the gene, on ethylene glycol (EG)-induced calcium oxalate (CaOx) crystals formation in rat kidney. Five pairs of RNA activation sequences targeting the promoter of rat TRPV5 were designed and synthesized...
August 3, 2017: Urolithiasis
https://www.readbyqxmd.com/read/28775336/shape-dependent-cellular-toxicity-on-renal-epithelial-cells-and-stone-risk-of-calcium-oxalate-dihydrate-crystals
#19
Xin-Yuan Sun, Jian-Ming Ouyang, Kai Yu
Renal epithelial cell injury causes crystal retention and leads to renal stone formation. However, the effects of crystal shape on cell injury and stone risk remain unclear. This study compared the cytotoxicity degrees of calcium oxalate dihydrate (COD) crystals having different shapes toward human kidney proximal tubular epithelial (HK-2) cells to reveal the effect of crystal shape on cell injury and to elucidate the pathological mechanism of calcium oxalate kidney stones. The effects of exposure to cross-shaped (COD-CS), flower-like (COD-FL), bipyramid (COD-BD), and elongated-bipyramid (COD-EBD) COD crystals on HK-2 cells were investigated by examining the cell viability, cell membrane integrity, cell morphology change, intracellular reactive oxygen species, mitochondrial membrane potential (Δψm), and apoptotic and/or necrotic rate...
August 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28774719/defective-methionine-metabolism-in-the-brain-after-repeated-blast-exposures-might-contribute-to-increased-oxidative-stress
#20
Peethambaran Arun, William B Rittase, Donna M Wilder, Ying Wang, Irene D Gist, Joseph B Long
Blast-induced traumatic brain injury (bTBI) is one of the major disabilities in Service Members returning from recent military operations. The neurobiological underpinnings of bTBI, which are associated with acute and chronic neuropathological and neurobehavioral deficits, are uncertain. Increased oxidative stress in the brain is reported to play a significant role promoting neuronal damage associated with both brain injury and neurodegenerative disorders. In this study, brains of rats exposed to repeated blasts in a shock tube underwent untargeted profiling of primary metabolism by automatic linear exchange/cold injection GC-TOF mass spectrometry and revealed acute and sub-acute disruptions in the metabolism of the essential amino acid methionine and associated antioxidants...
July 31, 2017: Neurochemistry International
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