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https://www.readbyqxmd.com/read/29223115/immobilization-of-hexavalent-chromium-in-contaminated-soils-using-biochar-supported-nanoscale-iron-sulfide-composite
#1
Honghong Lyu, Hang Zhao, Jingchun Tang, Yanyan Gong, Yao Huang, Qihang Wu, Bin Gao
Biochar supported carboxymethyl cellulose (CMC)-stabilized nanoscale iron sulfide (FeS) composite (CMC-FeS@biochar) was prepared and tested for immobilization of hexavalent chromium Cr(VI) in soil. Results of UV-vis and transmission electron microscopy (TEM) showed that the backbone of biochar suppressed the aggregation of FeS, resulting in smaller particle size and more sorption sites than bare FeS. The composite at a dosage of 2.5 mg per gram soil displayed an enhanced Cr(VI) immobilization efficiency (a 94...
December 1, 2017: Chemosphere
https://www.readbyqxmd.com/read/29223051/ultrasensitive-colorimetric-immunoassay-for-hcg-detection-based-on-dual-catalysis-of-au-pt-core-shell-nanoparticle-functionalized-by-horseradish-peroxidase
#2
Weiguo Wang, Yake Zou, Jinwu Yan, Jing Liu, Huixiong Chen, Shan Li, Lei Zhang
In this paper, an ultrasensitive colorimetric biosensor for human chorionic gonadotrophin (hCG) detection was designed from bottom-up method based on the dual catalysis of the horseradish peroxidase (HRP) and Au@Pt nanoparticles (NPs) relative to H2O2-TEM system. HRP and monoclonal mouse anti-hCG antibody (β-submit, mAb1) were co-immobilized onto the Au@Pt NP surface to improve catalytic efficiency and specificity, which formed a dual functionalized Au@Pt-HRP probe with the mean size of 42.8nm (D50). The colorimetric immunoassay was developed for the hCG detection, and the Au@Pt-HRP probe featured a higher sensitivity in the concentration range of 0...
December 5, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29222980/bonding-of-doxorubicin-to-nanosilica-and-human-serum-albumin-in-various-media
#3
V M Gun'ko, T V Krupska, L S Andriyko, N Yu Klymenko, I V Siora, O A Novikova, A I Marynin, A I Ukrainets, B Charmas, S B Shekhunova, V V Turov
Interaction of doxorubicin hydrochloride (DOX) (anti-cancer drug) with hydro-compacted nanosilica A-300 (cA-300) alone or cA-300/human serum albumin (HSA) at a small content of water (h = 0.4 g per gram of dry silica) in different dispersion media (air, chloroform, and chloroform/trifluoroacetic acid) was analyzed using low-temperature 1H NMR spectroscopy, NMR cryoporometry and quantum chemistry to elucidate specific changes in the interfacial layers. Initial (bulk density ρb ≈ 0.046 g/cm3) and hydro-compacted (ρb ≈ 0...
December 5, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29222976/enhanced-electrocatalytic-activity-and-stability-of-monodisperse-pt-nanocomposites-for-direct-methanol-fuel-cells
#4
Sinan Eris, Zeynep Daşdelen, Fatih Sen
Direct methanol fuel cells (DMFCs) are one of the most important fuel cells operating at low temperature using methanol as fuel and they need very efficient catalysts to activate the methanol. Generally, the most efficient fuel cell catalysts are platinum-based nanoparticles that can be used by different supporting materials such as different as prepared and functionalized carbon derivatives. For this purpose, herein, the carbon black has been mainly functionalized with an acidification process in order to increase the electrical conductivity and heterogeneous electron transfer rate of supporting materials...
December 1, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29222511/dynamics-of-transformation-from-platinum-icosahedral-nanoparticles-to-larger-fcc-crystal-at-millisecond-time-resolution
#5
Wenpei Gao, Jianbo Wu, Aram Yoon, Ping Lu, Liang Qi, Jianguo Wen, Dean J Miller, James C Mabon, William L Wilson, Hong Yang, Jian-Min Zuo
Atomic motion at grain boundaries is essential to microstructure development, growth and stability of catalysts and other nanostructured materials. However, boundary atomic motion is often too fast to observe in a conventional transmission electron microscope (TEM) and too slow for ultrafast electron microscopy. Here, we report on the entire transformation process of strained Pt icosahedral nanoparticles (ICNPs) into larger FCC crystals, captured at 2.5 ms time resolution using a fast electron camera. Results show slow diffusive dislocation motion at nm/s inside ICNPs and fast surface transformation at μm/s...
December 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29220816/ftir-and-raman-spectroscopic-studies-of-selenium-nanoparticles-synthesised-by-the-bacterium-azospirillum-thiophilum
#6
Anna V Tugarova, Polina V Mamchenkova, Yulia A Dyatlova, Alexander A Kamnev
Vibrational (Fourier transform infrared (FTIR) and Raman) spectroscopic techniques can provide unique molecular-level information on the structural and compositional characteristics of complicated biological objects. Thus, their applications in microbiology and related fields are steadily increasing. In this communication, biogenic selenium nanoparticles (Se NPs) were obtained via selenite (SeO32-) reduction by the bacterium Azospirillum thiophilum (strain VKM B-2513) for the first time, using an original methodology for obtaining extracellular NPs...
November 23, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29220175/a-spectroscopic-signature-for-stable-%C3%AE-amyloid-fibrils-versus-%C3%AE-sheet-rich-oligomers
#7
Justin P Lomont, Kacie L Rich, Michał Maj, Jia-Jung Ho, Joshua S Ostrander, Martin T Zanni
We use 2D IR spectroscopy to explore fibril formation for the two predominant isoforms of the β-amyloid (Aβ1-40 and Aβ1-42) protein associated with Alzheimer's disease. 2D IR spectra resolve a transition at 1610 cm-1 in Aβ fibrils that does not appear in other Aβ aggregates, even those with predominantly β-sheet structure like oligomers. This transition is not resolved in linear IR spectroscopy, because it lies under the broad band centered at 1625 cm-1 that is the traditional infrared signature for amy-loid fibrils...
December 8, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29219843/negative-differential-resistance-effect-induced-by-metal-ion-implantation-in-sio-sub-2-sub-film-for-multilevel-rram-application
#8
Facai Wu, Shuyao Si, Tuo Shi, Xiaolong Zhao, Qi Liu, Lei Liao, Hangbing Lv, Shibing Long, Ming Liu
Pt/SiO<sub>2</sub>:metal nanoparticles (MNPs)/Pt sandwich structure is fabricated with the method of metal ion (Ag) implantation. The device exhibits multilevel storage with appropriate R<sub>off</sub>/R<sub>on</sub> ratio, good endurance and retention properties. Based on transmission electron microscopy (TEM) and energy dispersive spectrometer (EDS) analysis, we confirm that Pt nanoparticles are spurted into SiO<sub>2 </sub>film from Pt bottom electrode by Ag implantation; during electroforming, the local electric field can be enhanced by these Pt nanoparticles, meanwhile the Ag nanoparticles constantly migrate toward the Pt nanoparticles...
December 8, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29219841/direct-observation-of-thermal-disorder-and-decomposition-of-black-phosphorus
#9
Seung Jo Yoo, Heejin Kim, Ji-Hyun Lee, Jin-Gyu Kim
Theoretical research has been devoted to reveal the properties of black phosphorus as a two-dimensional nanomaterial, but little attention has been paid for the experimental characterization. In this study, the thermal disorder and decomposition of black phosphorus were examined using in situ heating transmission electron microscopy (TEM) experiments. We observed that the breaking of crystallographic symmetry begins at 380°C under vacuum condition, followed by the phosphorus evaporates after long-term heating at 400°C...
December 8, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29219802/in-situ-high-resolution-transmission-electron-microscopy-tem-observation-of-sn-nanoparticles-on-sno2-nanotubes-under-lithiation
#10
Jun Young Cheong, Joon Ha Chang, Sung Joo Kim, Chanhoon Kim, Hyeon Kook Seo, Jae Won Shin, Jong Min Yuk, Jeong Yong Lee, Il-Doo Kim
We trace Sn nanoparticles (NPs) produced from SnO2 nanotubes (NTs) during lithiation initialized by high energy e-beam irradiation. The growth dynamics of Sn NPs is visualized in liquid electrolytes by graphene liquid cell transmission electron microscopy. The observation reveals that Sn NPs grow on the surface of SnO2 NTs via coalescence and the final shape of agglomerated NPs is governed by surface energy of the Sn NPs and the interfacial energy between Sn NPs and SnO2 NTs. Our result will likely benefit more rational material design of the ideal interface for facile ion insertion...
December 8, 2017: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/29218765/deregulation-of-autophagy-in-postmortem-brains-of-machado-joseph-disease-patients
#11
Annie Sittler, Marie-Paule Muriel, Martina Marinello, Alexis Brice, Wilfred den Dunnen, Sandro Alves
Autophagy, the major pathway for protein turnover, is critical to maintain cellular homeostasis and has been implicated in neurodegenerative diseases. The aim of this research was to analyze the expression of autophagy markers in postmortem brains from Machado-Joseph disease (MJD) patients. The expression of autophagy markers in the cerebellum and the oculomotor nucleus from MJD patients and age-matched controls with no signs of neuropathology was inspected postmortem by immunohistochemistry (IHC) and Western blot...
December 8, 2017: Neuropathology: Official Journal of the Japanese Society of Neuropathology
https://www.readbyqxmd.com/read/29218578/biomimetic-synthesis-of-silver-nanoparticles-using-flower-extract-of-bauhinia-purpurea-and-its-antibacterial-activity-against-clinical-pathogens
#12
Sudhakar Chinnappan, Selvam Kandasamy, Sengottaiyan Arumugam, Kamala-Kannan Seralathan, Selvankumar Thangaswamy, Govarthanan Muthusamy
In the present study, we have reported an eco-friendly, rapid, and simple method for the synthesis of silver nanoparticles (AgNPs) using Bauhinia purpurea flower extract as non-toxic bioreducing agent. The formation of AgNPs was confirmed by UV-visible spectroscopy, transmission electron microscopy (TEM), scanning electron microscopy and energy-dispersive spectroscopy (SEM-EDS), Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction (XRD). The synthesized AgNPs were spherical in shape with an average size of 20 nm...
December 7, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29218346/the-synthesis-of-a-monodisperse-quaternary-ferrite-fecocro4-from-the-hot-injection-thermolysis-of-the-single-source-precursor-crcofeo-o2ctbu-6-ho2ctbu-3
#13
Khadijat O Abdulwahab, Mohammad A Malik, Paul O'Brien, Iñigo J Vitorica-Yrezabal, Grigore A Timco, Floriana Tuna, Richard E P Winpenny
Monodisperse cobalt chromium ferrite (FeCoCrO4) nanoparticles have been synthesised using the trimetallic pivalate cluster [CrCoFeO(O2CtBu)6(HO2CtBu)3]. The precursor was thermolysed in oleylamine and oleic acid, with diphenyl ether as the solvent at 260 °C. The effect of time and the concentration of the precursor on the stoichiometry of the phase formed and/or the morphology of the nanoparticles was studied. The reaction time was investigated by withdrawing aliquots at different times. No products were formed after 5 minutes and aliquots withdrawn at reaction times of less than 1 hour contain traces of iron oxide (Fe2O3); only cubic cobalt chromium ferrite (FeCoCrO4) was obtained after one hour...
December 8, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29218341/templated-co-assembly-into-nanorods-of-polyanions-and-artificial-virus-capsid-proteins
#14
A Hernandez-Garcia, M A Cohen Stuart, R de Vries
Recombinant triblock polypeptides C-Sn-B, where C is a 400 amino acid long hydrophilic random coil block, Sn is a multimer of the silk-like octapeptide S = (GAGAGAGQ), and B = K12 is an oligolysine, have previously been shown to encapsulate double stranded DNA into rod-shaped, virus-like particles. In order to gain insight of the co-assembly process, and in order to be able to use these proteins for templating other types of nanorods, we here explore their co-assembly with a range of polyanionic templates: poly(acrylic acids) (PAA) of a wide range of lengths, poly(styrene sulphonate) (PSS) and the stiff anionic polysaccharide xanthan...
December 8, 2017: Soft Matter
https://www.readbyqxmd.com/read/29218337/synthesis-and-photoelectrocatalytic-activity-of-in2o3-hollow-microspheres-via-a-bio-template-route-using-yeast-templates
#15
Duo Pan, Shengsong Ge, Xiyu Zhang, Xianmin Mai, Shengyao Li, Zhanhu Guo
Indium oxide (In2O3) hollow microspheres were prepared using yeast as a bio-template with the aid of a precipitation method. The yeast provided a solid frame for the deposition of In(OH)3 to form the precursor. The resulting In2O3 hollow microspheres were obtained by calcining the precursor at 650 °C. The samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption-desorption isotherms and UV-Vis diffuse reflectance spectroscopy...
December 8, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29218316/the-feasibility-of-colorectal-endoscopic-submucosal-dissection-for-the-treatment-of-residual-or-recurrent-tumor-localized-in-therapeutic-scar-tissue
#16
Ryosuke Kobayashi, Kingo Hirasawa, Ryosuke Ikeda, Takeh de Fukuchi, Yasuaki Ishii, Hiroaki Kaneko, Makomo Makazu, Chiko Sato, Shin Maeda
Background and study aims:  Endoscopic submucosal dissection (ESD) is used to treat superficial colorectal tumors. Previous studies have reported the efficacy of ESD for treating residual or local recurrent colorectal tumors. This study sought to evaluate the efficacy of ESD in treating these lesions and to assess factors that prevent successful ESD. Methods:  This retrospective study assessed 25 cases of residual or local recurrent lesions that were previously treated using EMR (18 lesions), TEM (5 lesions), ESD (1 lesion) or surgery (1 lesion), and 459 primary lesions treated using ESD between April 2008 and September 2015...
December 2017: Endoscopy International Open
https://www.readbyqxmd.com/read/29217973/hybrid-transanal-and-total-mesorectal-excision-after-transanal-endoscopic-microsurgery-for-unfavourable-early-rectal-cancer-a-report-of-two-cases
#17
Narimantas E Samalavičius, Audrius Dulskas, Kęstutis Petrulis, Alfredas Kilius, Renatas Tikuišis, Raimundas Lunevičius
Completion total mesorectal excision (TME) is a rare but complex procedure after transanal endoscopic microsurgery for early rectal cancer with unfavourable final histology. Two cases are reported when completion TME was performed after upfront transanal partial mesorectal dissection. Intact non-perforated TME specimens with negative and adequate distal and circumferential margins were created. The quality of both total mesorectal excisions was complete and distal margins were sufficient. We believe that our technique might be a way of approaching completion TME after TEM, especially in cases of low rectal cancer...
2017: Acta Medica Lituanica
https://www.readbyqxmd.com/read/29216577/performance-enhancement-of-perovskite-solar-cells-by-employing-tio2-nanorod-arrays-decorated-with-cuins2-quantum-dots
#18
Feng Gao, Haitao Dai, Hongfei Pan, Yuanfang Chen, Jingkang Wang, Zhijian Chen
In this work, TiO2 nanorod arrays (TiO2-NAs) were modified by CuInS2 quantum dots (CuInS2 QDs) on the surface of the nanorods. The resultant TiO2-CuInS2 nanorod arrays (TiO2-CuInS2-NAs) were characterized by UV/Vis spectroscopy, transmission electronic microscopy (TEM), and X-ray diffraction (XRD). The TiO2-CuInS2-NAs were applied as scaffold for the preparation of organic-inorganic hybrid perovskite solar cells. In comparison with the solar cell devices based on TIO2-NAs, a significant improvement in the power conversion efficiency had been achieved and the highest efficiency was obtained as 11...
November 22, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29216549/kinetic-research-on-dechlorinating-dichlorobenzene-in-aqueous-system-by-nano-scale-nickel-iron-loaded-with-cmc-nfc-hydrogel
#19
Xiao-Fang Wan, Congbao Guo, Yu Liu, Xin-Sheng Chai, Youming Li, Guangxue Chen
In this study, we reported on the nano-scale nickel/iron particles loaded in carboxymethyl/nanofibrillated cellulose (CMC/NFC) hydrogel for the dechlorination of o-dichlorobenzene (DCB) in aqueous solution. The biodegradable hydrogel may provide an ideal supporting material for fastening the bimetallic nano-scale particles, which was examined and characterized by TEM, SEM-EDX, FT-IR and BET. The performance of the selected bimetallic particles was evaluated by conducting the dechlorination of DCB in the solution under different reaction conditions (e...
November 23, 2017: Chemosphere
https://www.readbyqxmd.com/read/29216410/three-dimensional-ultrastructure-of-chloroplast-pockets-formed-under-salinity-stress
#20
Koji Yamane, Takao Oi, Sakiko Enomoto, Tomoyo Nakao, Shigeo Arai, Hiroshi Miyake, Mitsutaka Taniguchi
We investigated the invagination structure of a chloroplast that surrounds organelles such as mitochondria and peroxisomes within a thin layer of chloroplast stroma, which is called a chloroplast pocket. In this study, chloroplast pockets were observed in rice plants subjected to salinity stress, but not under moderate growth condition. They included cytosol, transparent structure, lipid bodies, mitochondria, and peroxisomes. We constructed the three-dimensional architecture of chloroplast pockets by using serial images obtained by transmission electron microscopy (TEM) and focused ion beam-scanning electron microscopy (FIB-SEM)...
December 7, 2017: Plant, Cell & Environment
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