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Oxygen Carrier

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https://www.readbyqxmd.com/read/28728028/direct-evidence-of-the-photocatalytic-generation-of-reactive-oxygen-species-ros-in-a-bi2w2o9-layered-structure
#1
S Obregón, M A Ruíz-Gómez, D B Hernández-Uresti
In the present work, the Bi2W2O9 photocatalyst has been prepared by an easy and prompt co-precipitation route. From the structural characterization, we have stated that the formation of the Bi2W2O9 is accompanied by a small amount of the Bi2WO6 oxide, which gradually decreases by increasing the calcination temperature. The conduction and valence band edges of the Bi2W2O9 semiconductor were experimentally estimated for the first time using the X-ray photoelectron (XPS) and diffuse reflectance (DRS) spectroscopies...
July 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28727321/micelle-directing-synthesis-of-the-ag-doped-wo3-and-moo3-composite-for-the-photocatalytic-water-oxidation-and-organic-dyes-adsorption
#2
Nasen Bate, Hongfei Shi, Li Chen, Jiabo Wang, Shasha Xu, Weilin Chen, Jianping Li, En-Bo Wang
In this paper, Ag-doped WO3 (MoO3) composite has been prepared by a simple micelle directed method and high temperature sintering route. The as-prepared samples were characterized by XRD, ICP, TEM, XPS, DRS, BET, PL and EIS techniques. The photocatalytic experiments reveal that their oxygen production rates are up to 95.43 μmol (75.45 μmol) for Ag-doped WO3 (MoO3), which is 9.5 (7.3) times higher than that of pure WO3: 9.012 μmol (MoO3: 9.00 μmol) under visible light illumination (λ ≥ 420 nm), respectively...
July 20, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28726385/low-temperature-post-functionalization-of-highly-conductive-oxide-thin-films-toward-solution-based-large-scale-electronics
#3
Seok-Gyu Ban, Kyung-Tae Kim, Byung Doo Choi, Jeong-Wan Jo, Yong-Hoon Kim, Antonio Facchetti, Myung-Gil Kim, Sung Kyu Park
Although transparent conducting oxides (TCOs) have played a key role in a wide range of solid-state electronics from conventional optoelectronics to emerging electronic systems, the processing temperature and conductivity of solution-processed materials seem to be far exceeding the thermal limitations of soft materials and insufficient for high-perfomance large-area systems, respectively. Here, we report a strategy to form highly conductive and scalable solution-processed oxide materials and their successful translation into large-area electronic applications, which is enabled by photo-assisted post-functionalization at low-temperature...
July 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28718974/pre-pubertal-diet-restriction-reduces-reactive-oxygen-species-and-restores-fertility-in-male-wnin-obese-rat
#4
D M Dinesh Yadav, M N Muralidhar, S M V K Prasad, K Rajender Rao
Obesity is a multifactorial disorder associated with increased body adiposity, chronic oxidative stress which contributes to impaired fertility in males. Diet restriction and anti-oxidant supplementations are known to protect obese subjects from oxidative stress and improves fertility. However, the role of oxidative stress and the age of intervention in restoring male fertility are poorly understood. This study was aimed to assess the effect of diet restriction on fertility with respect to the age of intervention, body composition and oxidative stress using WNIN/Ob obese mutant rat strain...
July 18, 2017: Andrologia
https://www.readbyqxmd.com/read/28715034/surface-chemistry-and-stability-of-metastable-corundum-type-in2o3
#5
Eva-Maria Köck, Michaela Kogler, Chen Zhuo, Lukas Schlicker, Maged F Bekheet, Andrew Doran, Aleksander Gurlo, Simon Penner
To account for the explanation of an eventual sensing and catalytic behavior of rhombohedral In2O3 (rh-In2O3) and the dependence of the metastability of the latter on gas atmospheres, in situ electrochemical impedance spectroscopic (EIS), Fourier-transform infrared spectroscopic (FT-IR), in situ X-ray diffraction and in situ thermogravimetric analyses in inert (helium) and reactive gases (hydrogen, carbon monoxide and carbon dioxide) have been conducted to link the gas-dependent electrical conductivity features and the surface chemical properties to its metastability towards cubic In2O3...
July 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28702600/an-nir-sensitive-layered-supramolecular-nanovehicle-for-combined-dual-modal-imaging-and-synergistic-therapy
#6
Shanyue Guan, Yangziwan Weng, Mengnan Li, Ruizheng Liang, Chenghua Sun, Xiaozhong Qu, Shuyun Zhou
A supramolecular nanovehicle, denoted as ICG-DOX/Gd-LDH, was synthesized by the co-intercalation of indocyanine green (ICG) and doxorubicin hydrochloride (DOX) into a gallery of Gd(3+)-doped-layered double hydroxide (Gd-LDH) such that to achieve a chemo-photothermal synergistic therapeutic agent. The unique structure of Gd-LDH can not only stabilize the photothermal agent ICG to enhance the photothermal efficiency, but also hamper the recombination between electron and holes, leading to the generation of more reactive oxygen species (ROS) under irradiation in the NIR range...
July 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/28702585/graphene-oxide-stabilized-perfluorocarbon-emulsions-for-controlled-oxygen-delivery
#7
Ghulam Jalani, Dhanalakshmi Jeyachandran, Richard Bertram Church, Marta Cerruti
Perfluorocarbon (PFC) emulsions are capable of absorbing large quantities of oxygen. They are widely used as blood alternates for quick oxygenation of tissues. However, they are unsuitable for applications where sustained oxygen supply is desired over an extended period of time. Here, we have designed a new PFC oxygen delivery system that combines perfluorodecalin with graphene oxide (GO), where GO acts both as an emulsifier and a stabilizing agent. The resulting emulsions (PFC@GO) release oxygen at least one order of magnitude slower than emulsions prepared with other common surfactants...
July 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/28699623/spin-orbit-interaction-and-kondo-scattering-at-the-pralo-sub-3-sub-srtio-sub-3-sub-interface-effects-of-oxygen-content
#8
Shirin Mozaffari, Samaresh Guchhait, J T Markert
We report the effects of oxygen pressure during growth (P<sub>O2</sub>) on the electronic and magnetic properties of PrAlO<sub>3</sub> films grown on TiO<sub>2</sub>-terminated SrTiO<sub>3</sub> substrates. Resistivity measurements show an increase in the sheet resistance as P<sub>O2</sub> is increased. The saturation of the sheet resistance down to 0.3 K is consistent with Kondo theory for P<sub>O2</sub> ≥ 10<sup>-5</sup> torr...
July 12, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28698356/root-bending-is-antagonistically-affected-by-hypoxia-and-erf-mediated-transcription-via-auxin-signaling
#9
Emese Eysholdt-Derzso, Margret Sauter
When plants encounter soil water logging or flooding, roots are the first organs to be confronted with reduced gas diffusion resulting in limited oxygen supply. Since roots do not generate photosynthetic oxygen they are rapidly faced with oxygen shortage rendering roots particularly prone to damage. While metabolic adaptations to low oxygen conditions, that ensure basic energy supply, have been well characterized, adaptation of root growth and development have received less attention. In this study we show that hypoxic conditions cause the primary root to grow sidewise in a low oxygen environment possibly to escape soil patches with reduced oxygen availability...
July 11, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28693344/ultrasound-mediated-drug-delivery-by-gas-bubbles-generated-from-a-chemical-reaction
#10
Sungmun Lee, Leena Al-Kaabi, Aurélie Mawart, Ahsan Khandoker, Habiba Alsafar, Herbert F Jelinek, Kinda Khalaf, Ji-Ho Park, Yeu-Chun Kim
Highly echogenic and ultrasound-responsive microbubbles such as nitrogen, and perfluorocarbons have been exploited as ultrasound-mediated drug carriers. Here, we propose an innovative method for drug delivery using microbubbles generated from a chemical reaction. In a novel drug delivery system, luminol encapsulated in folate-conjugated bovine serum albumin nanoparticles (Fol-BSAN) can generate nitrogen gas (N2) by chemical reaction when it reacts with hydrogen peroxide (H2O2), one of reactive oxygen species (ROS)...
July 11, 2017: Journal of Drug Targeting
https://www.readbyqxmd.com/read/28692929/a-new-recycling-technique-for-the-waste-tires-reuse
#11
Zahra Derakhshan, Mohammad Taghi Ghaneian, Amir Hossein Mahvi, Gea Oliveri Conti, Mohammad Faramarzian, Mansooreh Dehghani, Margherita Ferrante
In this series of laboratory experiments, the feasibility of using fixed bed biofilm carriers (FBBC) manufactured from existing reclaimed waste tires (RWTs) for wastewater treatment was evaluated. To assess polyamide yarn waste tires as a media, the fixed bed sequence batch reactor (FBSBR) was evaluated under different organic loading rate (OLRs). An experimental model was used to study the kinetics of substrate consumption in biofilm. Removal efficiency of soluble chemical oxygen demand (SCOD) ranged by 76-98% for the FBSBR compared to 71-96% in a sequencing batch reactor (SBR)...
July 7, 2017: Environmental Research
https://www.readbyqxmd.com/read/28690261/improvement-of-a-phosphate-ion-selective-microsensor-using-bis-dibromophenylstannyl-methane-as-a-carrier
#12
Hisashi Satoh, Yuji Miyazaki, Shou Taniuchi, Mamoru Oshiki, Rathnayake M L D Rathnayake, Masahiro Takahashi, Satoshi Okabe
An ionophore-doped sensing membrane phosphate (PO4) microsensor based on bis(dibromophenylstannyl)methane (Bis microsensor) is described. The Bis microsensor showed a Nernstian response. The response of the Bis microsensor was log-linear down to a monohydrogen phosphate ion (HPO4(2-)) concentration of 0.5 μM (corresponding to 1.0 μM of orthophosphate at pH 7.2), whereas the detection limit of PO4-microsensors based on trialkyl/aryltin chloride was 50 μM of HPO4(2-). The Bis microsensor showed excellent selectivity for HPO4(2-) against nitrite, nitrate, chloride, bicarbonate and sulfate, as compared with PO4 microsensors based on trialkyl/aryltin chloride...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28685710/effect-of-defects-on-the-small-polaron-formation-and-transport-properties-of-hematite-from-first-principles-calculations
#13
Tyler James Smart, Yuan Ping
Hematite (α-Fe2O3) is a promising candidate as photoanode materials for solar-to-fuel conversion due to its favorable band gap for visible light absorption, its stability in an aqueous environment and its relatively low cost in comparison to other prospective materials. However, the small polaron transport nature in α-Fe2O3 results in low carrier mobility and conductivity, significantly lowering its efficiency from the theoretical limit. Experimentally, it has been found that the incorporation of oxygen vacancies and other dopants, such as Sn, into the material appreciably enhances its photo-to- current efficiency...
July 7, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28685467/characterization-of-protein-protein-interactions-in-recombinant-hemoglobin-producing-escherichia-coli-cells-using-molecularly-imprinted-polymers
#14
Ka Zhang, Tongchang Zhou, Lei Ye, Leif Bülow
The worldwide blood shortage has generated demands for alternatives to transfusible human blood. One such important option is based on recombinant hemoglobin-based oxygen carriers (rHBOCs). Most efforts have been focused on various E. coli based production systems. One of the key challenges in these systems is to devise an efficient and economical protein production strategy involving selection of suitable host cell and Hb variant, growth conditions and media engineering. Hb also influences the heterologous host cell metabolism and therefore the identification of modified protein-protein interactions is critical for optimizing Hb production...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28685464/hemoglobin-based-oxygen-carrier-hboc-development-in-trauma-previous-regulatory-challenges-lessons-learned-and-a-path-forward
#15
Peter E Keipert
Historically, hemoglobin-based oxygen carriers (HBOCs) were being developed as "blood substitutes," despite their transient circulatory half-life (~ 24 h) vs. transfused red blood cells (RBCs). More recently, HBOC commercial development focused on "oxygen therapeutic" indications to provide a temporary oxygenation bridge until medical or surgical interventions (including RBC transfusion, if required) can be initiated. This included the early trauma trials with HemAssist (®) (BAXTER), Hemopure (®) (BIOPURE) and PolyHeme (®) (NORTHFIELD) for resuscitating hypotensive shock...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28679119/biodegradable-plastic-bags-on-the-seafloor-a-future-threat-for-seagrass-meadows
#16
Elena Balestri, Virginia Menicagli, Flavia Vallerini, Claudio Lardicci
Marine plastic litter is a global concern. Carrier bags manufactured from non-biodegradable polymers constitute a large component of this litter. Because of their adverse impact on marine life, non-biodegradable bags have recently been replaced by biodegradable ones. However, growing evidence shows that these latter are not readily degradable in marine sediments and can alter benthic assemblages. The potential impact of biodegradable bags on seagrasses inhabiting sandy bottoms, which are the most widespread and productive ecosystems of the coastal zones, has been ignored...
July 2, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28671220/combining-two-redox-active-rare-earth-elements-for-oxygen-storage-electrical-properties-and-defect-chemistry-of-ceria-praseodymia-single-crystals
#17
Kathrin Michel, Jens-Peter Eufinger, Gregor Ulbrich, Martin Lerch, Juergen Janek, Matthias T Elm
Solid solutions of ceria and praseodymia are highly relevant for electrochemical applications as the incorporation of praseodymium into the ceria lattice shifts the range of mixed ionic electronic conductivity to higher oxygen partial pressures. To better understand the influence of praseodymium substitution on the transport processes and oxygen storage capacity in ceria, single crystals of ceria substituted with 14 mol% praseodymium have been investigated, obtaining the bulk properties without the influence of grain boundaries...
July 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28671030/continuous-in-vitro-exposure-of-intestinal-epithelial-cells-to-e171-food-additive-causes-oxidative-stress-inducing-oxidation-of-dna-bases-but-no-endoplasmic-reticulum-stress
#18
Marie Dorier, David Béal, Caroline Marie-Desvergne, Muriel Dubosson, Frédérick Barreau, Eric Houdeau, Nathalie Herlin-Boime, Marie Carriere
The whitening and opacifying properties of titanium dioxide (TiO2) are commonly exploited when it is used as a food additive (E171). However, the safety of this additive can be questioned as TiO2 nanoparticles (TiO2-NPs) have been classed at potentially toxic. This study aimed to shed some light on the mechanisms behind the potential toxicity of E171 on epithelial intestinal cells, using two in vitro models: (i) a monoculture of differentiated Caco-2 cells and (ii) a coculture of Caco-2 with HT29-MTX mucus-secreting cells...
July 19, 2017: Nanotoxicology
https://www.readbyqxmd.com/read/28668477/cyclometalated-iridium-iii-guanidinium-complexes-as-mitochondria-targeted-anticancer-agents
#19
Xing-Dong Song, Xia Kong, Shu-Fen He, Jia-Xi Chen, Jing Sun, Bing-Bing Chen, Jin-Wu Zhao, Zong-Wan Mao
Guanidinium-functionalized molecules are commonly studied for their use as pharmaceutically active compounds and drugs carriers. Herein, four cyclometalated iridium(III) complexes containing guanidinium ligands have been synthesized and characterized as potential anticancer agents. These complexes exhibit moderate antitumor activity in HeLa, MCF-7, HepG2, CNE-2, and A549 human tumor cells. Interestingly, all complexes showed higher cytotoxicity than cisplatin against a cisplatin-resistant cell line A549R, and less cytotoxicity on the nontumorigenic LO2 cells...
June 23, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28666601/impact-of-a-cardiac-intensivist-on-mortality-in-patients-with-cardiogenic-shock
#20
Soo Jin Na, Taek Kyu Park, Ga Yeon Lee, Yang Hyun Cho, Chi Ryang Chung, Kyeongman Jeon, Gee Young Suh, Joong Hyun Ahn, Keumhee C Carriere, Young Bin Song, Jin-Oh Choi, Joo-Yong Hahn, Seung-Hyuk Choi, Hyeon-Cheol Gwon, Jeong Hoon Yang
BACKGROUND: This study aimed to evaluate the association between high-intensity staffing by a dedicated cardiac intensivist and clinical outcomes in CS. METHODS: We enrolled 2923 consecutive patients admitted to a cardiac care unit (CCU) from January 1, 2012 to December 31, 2015. In January 2013, the CCU changed from a low-intensity to high-intensity staffing unit managed by a dedicated cardiac intensivist. Patients were eligible if they required inotropes or vasopressors to maintain a systolic blood pressure>90mmHg, and had serum lactate≥2...
June 24, 2017: International Journal of Cardiology
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