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https://www.readbyqxmd.com/read/27914341/single-crystalline-titanium-dioxide-hollow-tetragonal-nanocones-with-large-exposed-101-facets-for-excellent-photocatalysis
#1
Zhengcui Wu, Yejing Xue, Zexian Zou, Xia Wang, Feng Gao
Crystal facet engineering and surface modification of semiconductor have become important strategies to improve photocatalytic activity by optimizing surface charge carrier separation/transfer and extending solar spectrum utilization. In this work, we report anatase single-crystalline TiO2 hollow tetragonal nanocones with large exposed (101) facets by a facile liquid-phase interfacial synthetic strategy, using the hydrolysis of tetrabutyltitanate with adscititious water in the organic solvent of cyclohexane and a capping agent of 1, 6-hexanediamine...
November 23, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27912119/tuning-of-shell-thickness-of-solid-lipid-particles-impacts-the-chemical-stability-of-encapsulated-%C3%AF-3-fish-oil
#2
Hanna Salminen, Thrandur Helgason, Bjarki Kristinsson, Kristberg Kristbergsson, Jochen Weiss
HYPOTHESIS: This study demonstrates that tuning the shell thickness of lipid particles can modulate their oxidative stability. We hypothesized that a thick crystallized shell around the incorporated fish oil would improve the oxidative stability due to the reduced diffusion of prooxidants and oxygen. EXPERIMENTS: We prepared solid lipid nanoparticles (5%w/w lipid phase, 1.5%w/w surfactant, pH 7) by using different ratios of tristearin as carrier lipid and ω-3 fish oil as incorporated liquid lipid stabilized by high- or low-melting lecithin...
November 19, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27911785/carrier-dynamics-and-the-role-of-surface-defects-designing-a-photocatalyst-for-gas-phase-co2-reduction
#3
Laura B Hoch, Paul Szymanski, Kulbir Kaur Ghuman, Le He, Kristine Liao, Qiao Qiao, Laura M Reyes, Yimei Zhu, Mostafa A El-Sayed, Chandra Veer Singh, Geoffrey A Ozin
In2O3-x(OH)y nanoparticles have been shown to function as an effective gas-phase photocatalyst for the reduction of CO2 to CO via the reverse water-gas shift reaction. Their photocatalytic activity is strongly correlated to the number of oxygen vacancy and hydroxide defects present in the system. To better understand how such defects interact with photogenerated electrons and holes in these materials, we have studied the relaxation dynamics of In2O3-x(OH)y nanoparticles with varying concentration of defects using two different excitation energies corresponding to above-band-gap (318-nm) and near-band-gap (405-nm) excitations...
November 28, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27909862/combined-characterization-of-bovine-polyhemoglobin-microcapsules-by-uv-vis-absorption-spectroscopy-and-cyclic-voltammetry
#4
Marcos Camargo Knirsch, Filippo Dell'Anno, Marco Salerno, Claudio Larosa, Bronislaw Polakiewicz, Roberto Eggenhöffner, Attilio Converti
Polyhemoglobin produced from pure bovine hemoglobin by reaction with PEG bis(N-succynimidil succinate) as a cross-linking agent was encapsulated in gelatin and dehydrated by freeze-drying. Free carboxyhemoglobin and polyhemoglobin microcapsules were characterized by UV-Vis spectroscopy in the absorption range 450-650 nm and cyclic voltammetry in the voltage range from -0.8 to 0.6 mV to evaluate the ability to break the bond with carbon monoxide and to study the carrier's affinity for oxygen, respectively...
December 1, 2016: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/27908199/hemoglobin-extravasation-in-the-brain-of-rats-exchange-transfused-with-hemoglobin-based-oxygen-carriers
#5
Laura Terraneo, Paola Bianciardi, Ashok Malavalli, Gnel Mkrtchyan, Stephanie N Spann, Jeff Lohman, Michele Samaja, Kim D Vandegriff
Haemoglobin (Hb)-based oxygen carriers are under consideration as oxygen therapeutics. Their effect on apoptosis is critical, because the onset of pro-apoptotic pathways may lead to tissue damage. MP4OX, a polyethylene glycol-conjugated human Hb preserves the baseline level of neuron apoptosis with respect to sham. Here we develop a method for measuring Hb extravasation in brain. We exchange transfused rats by haemorrhaging 50% of their blood with simultaneous, isovolemic replacement with Hextend (negative control), MP4OX, or αα-cross-linked Hb...
December 1, 2016: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/27907860/co-delivery-of-vp-16-and-bcl-2-targeted-antisense-on-peg-grafted-omwcnts-for-synergistic-in-vitro-anti-cancer-effects-in-non-small-and-small-cell-lung-cancer
#6
Zbynek Heger, Hana Polanska, Sona Krizkova, Jan Balvan, Martina Raudenska, Simona Dostalova, Amitava Moulick, Michal Masarik, Vojtech Adam
Present study describes the preparation of a polyethylene glycol-grafted oxidized multi-walled carbon nanotubes (oMWCNTs-PEG) hybrid nanosystem as a carrier of etoposide (VP-16) and Bcl-2 phosphorothioate antisense deoxyoligonucleotides (Aso) to achieve a superior cytostastic efficacy in non-small and small cell lung cancer in vitro. We have demonstrated that the adsorption of hydrophobic VP-16 and Bcl-2 Aso results in a stable nanotransporter exhibiting good dispersion with excellent release profiles (both, in pH 7...
November 19, 2016: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/27906496/aerobic-expression-of-vitreoscilla-hemoglobin-improves-the-growth-performance-of-cho-k1-cells
#7
Mariana Juárez, Claudia H González-De la Rosa, Elisa Memún, Juan-Carlos Sigala, Alvaro R Lara
Inefficient carbon metabolism is a relevant issue during the culture of mammalian cells for the production of biopharmaceuticals. Therefore, cell engineering strategies to improve the metabolic and growth performance of cell lines are needed. The expression of Vitreoscilla stercoraria hemoglobin (VHb) has been shown to significantly reduce overflow metabolism and improve the aerobic growth of bacteria. However, the effects of VHb on mammalian cells have been rarely studied. Here, the impact of VHb on growth and lactate accumulation during CHO-K1 cell culture was investigated...
December 1, 2016: Biotechnology Journal
https://www.readbyqxmd.com/read/27906137/in-vitro-toxicity-of-carbon-nanotube-polylysine-colloids-to-colon-cancer-cells
#8
Alejandro Ansón-Casaos, Laura Grasa, Desirée Pereboom, José Emilio Mesonero, Alvaro Casanova, María Divina Murillo, María Teresa Martínez
Single-walled carbon nanotubes (SWCNTs) are thoroughly purified and dispersed in an aqueous solution of high molecular weight poly-L-lysine (pLlys). Human intestinal epithelial Caco-2/TC7 cells are incubated with the SWCNT dispersions in pLlys, and their effects on cell viability are studied by image flow cytometry. No significant changes are observed in the cell culture wells up to pLlys concentrations of 10 μg ml(-1). However, high mortality is detected at pLlys concentrations of 100 μg ml(-1). The presence of oxygen-free SWCNTs does not modify the effects of pLlys on cell cultures at any of the tested concentrations (≤1 μg ml(-1))...
December 2016: IET Nanobiotechnology
https://www.readbyqxmd.com/read/27900880/associations-of-nicotinamide-n-methyltransferase-gene-single-nucleotide-polymorphisms-with-sport-performance-and-relative-maximal-oxygen-uptake
#9
Jiang-Hua Li, Wei Chen, Xiao-Juan Zhu, Ya-Jun Lin, Li-Qiang Qiu, Can-Xin Cai, Ya-Hui Wang, Qun Xiong, Fei Chen, Li-Hui Chen
To observe the associations between single nucleotide polymorphisms (SNPs) of nicotinamide N-methyltransferase (NNMT) gene and sport performance and to analyse genotype associations of the associated SNPs with sport performance and relative maximal oxygen uptake ([Formula: see text]). Participants were selected from 685 Chinese Han male college students. The completion times of a 1000-m run and a 50-m run were used to reflect sport performance, respectively. Nineteen tagSNPs were genotyped with Polymerase chain reaction-ligase detection reaction...
November 30, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/27896346/visible-light-driven-mesoporous-ag-embedded-zno-nanocomposites-reactive-oxygen-species-enhanced-photocatalysis-bacterial-inhibition-and-photodynamic-therapy
#10
Jagriti Gupta, Jeotikanta Mohapatra, D Bahadur
We present here the multitasking capabilities of Ag-embedded ZnO nanocomposites (Ag-ZnO NCs), which include the photocatalytic degradation of organic dyes, bacterial inhibition, and cancer therapeutics. Ag-embedded ZnO nanocomposites (Ag-ZnO NCs) of mesoporous spherical morphology (size ∼ 150 ± 50 nm) are successfully synthesized by a facile and single step soft-chemical approach. To understand the effect of Ag loading on multitasking properties, Ag-ZnO NCs are synthesized with different wt% of Ag. It was found that Ag5-ZnO NCs (5 wt% of Ag) showed excellent solar light-induced photocatalytic degradation properties against both cationic as well as anionic dyes...
November 29, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27892814/a-new-route-of-bioaugmentation-by-allochthonous-and-autochthonous-through-biofilm-bacteria-for-scod-removal-of-old-leachate
#11
Rashid Alijani Ardeshir, Sara Rastgar, Majid Peyravi, Mohsen Jahanshahi, Ali Shokuhi Rad
Landfill leachate contains environmental pollutants that are generally resistant to biodegradation. In this study, indigenous and exogenous bacteria in leachate were acclimated in both biofilm and suspension forms to increase the removal of SCOD (soluble chemical oxygen demand). The bacteria from the leachate and sewage were acclimated to gradually increasing leachate concentration prepared using a reverse osmosis membrane over 28 days. The SCOD removal was measured aerobically or nominally anaerobically. Biofilms were prepared using different carrier media (glass, rubber, and plastic)...
November 28, 2016: Environmental Technology
https://www.readbyqxmd.com/read/27886327/in-situ-tem-observation-on-the-interface-type-resistive-switching-by-electrochemical-redox-reactions-at-a-tin-pcmo-interface
#12
Kyungjoon Baek, Sangsu Park, Jucheol Park, Young-Min Kim, Hyunsang Hwang, Sang Ho Oh
The interface-type resistive switching devices exhibiting bipolar and multi-level resistive switching have been considered as the key component for neuromorphic device applications. To directly observe the microscopic details of underlying electrochemical redox reactions occuring at a metal/oxide interface, we implemented in situ resistive switching of TiN/Pr0.7Ca0.3MnO3 (PCMO)/Pt junction devices in a transmission electron microscope (TEM). The in situ TEM observations directly show that an intermediate reaction layer (TiOxNy), growing and shrinking in the thickness range of a few nanometers at the TiN/PCMO interface in response to the applied voltage, mainly determines the device resistance by limiting the transport of charge carriers via the Poole-Frenkel conduction mechanism...
November 25, 2016: Nanoscale
https://www.readbyqxmd.com/read/27877874/growth-condition-dependence-of-unintentional-oxygen-incorporation-in-epitaxial-gan
#13
Felix Schubert, Steffen Wirth, Friederike Zimmermann, Johannes Heitmann, Thomas Mikolajick, Stefan Schmult
Growth conditions have a tremendous impact on the unintentional background impurity concentration in gallium nitride (GaN) synthesized by molecular beam epitaxy and its resulting chemical and physical properties. In particular for oxygen identified as the dominant background impurity we demonstrate that under optimized growth stoichiometry the growth temperature is the key parameter to control its incorporation and that an increase by 55 °C leads to an oxygen reduction by one order of magnitude. Quantitatively this reduction and the resulting optical and electrical properties are analyzed by secondary ion mass spectroscopy, photoluminescence, capacitance versus voltage measurements, low temperature magneto-transport and parasitic current paths in lateral transistor test structures based on two-dimensional electron gases...
2016: Science and Technology of Advanced Materials
https://www.readbyqxmd.com/read/27876873/the-effect-of-silica-nanoparticles-on-human-corneal-epithelial-cells
#14
Joo-Hee Park, Hyejoong Jeong, Jinkee Hong, Minwook Chang, Martha Kim, Roy S Chuck, Jimmy K Lee, Choul-Yong Park
Ocular drug delivery is an interesting field in current research. Silica nanoparticles (SiNPs) are promising drug carriers for ophthalmic drug delivery. However, little is known about the toxicity of SiNPs on ocular surface cells such as human corneal epithelial cells (HCECs). In this study, we evaluated the cytotoxicity induced by 50, 100 and 150 nm sizes of SiNPs on cultured HCECs for up to 48 hours. SiNPs were up-taken by HCECs inside cytoplasmic vacuoles. Cellular reactive oxygen species generation was mildly elevated, dose dependently, with SiNPs, but no significant decrease of cellular viability was observed up to concentrations of 100 μg/ml for three different sized SiNPs...
November 23, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27872198/in-female-rat-heart-mitochondria-oophorectomy-results-in-loss-of-oxidative-phosphorylation
#15
Natalia Pavón, Alfredo Cabrera-Orefice, Juan Carlos Gallardo-Pérez, Cristina Uribe-Alvarez, Nadia Rivero, Edgar Ricardo Vazquez-Martinez, Marco A Cerbón, Eduardo Martínez-Abundis, Juan Carlos Torres-Narvaez, Raúl Martínez-Memije, Francisco-Javier Roldán-Gómez, Salvador Uribe-Carvajal
Oophorectomy in adult rats affected cardiac mitochondrial function. Progression of mitochondrial alterations was assessed at one, two and three months post-surgery: at one-month very slight changes were observed, which increased at two and three months. Gradual effects included decrease in the rates of oxygen consumption and in respiratory uncoupling in the presence of complex I substrates, as well as compromised Ca2+ buffering ability. Malondialdehyde concentration increased, while the ROS-detoxifying enzyme Mn2+-superoxide-dismutase (MnSOD) and aconitase lost activity...
November 21, 2016: Journal of Endocrinology
https://www.readbyqxmd.com/read/27871745/the-effect-of-dissolved-oxygen-concentration-do-on-oxygen-diffusion-and-bacterial-community-structure-in-moving-bed-sequencing-batch-reactor-mbsbr
#16
Yongfeng Cao, Chaosheng Zhang, Hongwei Rong, Guilin Zheng, Limin Zhao
The effect of dissolved oxygen concentration (DO) on simultaneous nitrification and denitrification was studied in a moving bed sequencing batch reactor (MBSBR) by microelectrode measurements and by real-time PCR. In this system, the biofilm grew on polyurethane foam carriers used to treat municipal sewage at five DO concentrations (1.5, 2.5, 3.5, 4.5 and 5.5 mg/L). The results indicated that the MBSBR exhibited good removal of chemical oxygen demand (92.43%) and nitrogen (83.73%) when DO concentration was 2...
October 24, 2016: Water Research
https://www.readbyqxmd.com/read/27871387/mediator-free-interaction-of-glucose-oxidase-as-model-enzyme-for-immobilization-with-al-doped-and-undoped-zno-thin-films-laser-deposited-on-polycarbonate-supports
#17
Fidal V T K P, Saikumar Inguva, Satheesh Krishnamurthy, Enrico Marsili, Jean-Paul Mosnier, Chandra T S
Al doped and undoped ZnO thin films were deposited by pulsed-laser deposition on polycarbonate sheets. The films were characterized by optical transmission, Hall effect measurement, XRD and SEM. Optical transmission and surface reflectometry studies showed good transparency with thicknesses ∼100nm and surface roughness of 10nm. Hall effect measurements showed that the sheet carrier concentration was -1.44×10(15)cm(-2) for AZO and -6×10(14)cm(-2) for ZnO. The films were then modified by drop-casting glucose oxidase (GOx) without the use of any mediators...
January 2017: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/27869258/oxygen-vacancy-promoted-methane-partial-oxidation-over-iron-oxide-oxygen-carriers-in-the-chemical-looping-process
#18
Zhuo Cheng, Lang Qin, Mengqing Guo, Mingyuan Xu, Jonathan A Fan, Liang-Shih Fan
We perform ab initio DFT+U calculations and experimental studies of the partial oxidation of methane to syngas on iron oxide oxygen carriers to elucidate the role of oxygen vacancies in oxygen carrier reactivity. In particular, we explore the effect of oxygen vacancy concentration on sequential processes of methane dehydrogenation, and oxidation with lattice oxygen. We find that when CH4 adsorbs onto Fe atop sites without neighboring oxygen vacancies, it dehydrogenates with CHx radicals remaining on the same site and evolves into CO2via the complete oxidation pathway...
November 30, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27867357/machine-perfusion-of-porcine-livers-with-oxygen-carrying-solution-results-in-reprogramming-of-dynamic-inflammation-networks
#19
David Sadowsky, Ruben Zamora, Derek Barclay, Jinling Yin, Paulo Fontes, Yoram Vodovotz
Background:Ex vivo machine perfusion (MP) can better preserve organs for transplantation. We have recently reported on the first application of an MP protocol in which liver allografts were fully oxygenated, under dual pressures and subnormothermic conditions, with a new hemoglobin-based oxygen carrier (HBOC) solution specifically developed for ex vivo utilization. In those studies, MP improved organ function post-operatively and reduced inflammation in porcine livers. Herein, we sought to refine our knowledge regarding the impact of MP by defining dynamic networks of inflammation in both tissue and perfusate...
2016: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/27865213/phenotypic-correction-of-fanconi-anemia-cells-in-the-murine-bone-marrow-after-carrier-cell-mediated-delivery-of-lentiviral-vector
#20
Santhosh Chakkaramakkil Verghese, Natalya A Goloviznina, Peter Kurre
Fanconi anemia (FA) is an autosomal-recessive disorder associated with hematopoietic failure and it is a candidate for hematopoietic stem cell (HSC)-directed gene therapy. However, the characteristically reduced HSC numbers found in FA patients, their ineffective mobilization from the marrow, and re-oxygenation damage during ex vivo manipulation have precluded clinical success using conventional in vitro approaches. We previously demonstrated that lentiviral vector (LV) particles reversibly attach to the cell surface where they gain protection from serum complement neutralization...
November 19, 2016: Stem Cell Research & Therapy
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