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Oxygen sensing

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https://www.readbyqxmd.com/read/28730145/prokaryotic-rna-associated-to-bacterial-viability-induces-polymorphonuclear-neutrophil-activation
#1
Nahuel Rodriguez-Rodrigues, Luis A Castillo, Verónica I Landoni, Daiana Martire-Greco, M Ayelén Milillo, Paula Barrionuevo, Gabriela C Fernández
Polymorphonuclear neutrophils (PMN) are the first cellular line of antibacterial host defense. They sense pathogens through recognition of pathogen-associated molecular patterns (PAMPs) by innate pattern recognition receptors, such as Toll-like receptors (TLR). The aim of this study was to investigate whether PMN sense bacterial viability and explore which viability factor could be involved in this phenomenon. For this purpose, different functions were evaluated in isolated human PMN using live Escherichia coli (Ec) and heat-killed Ec (HK-Ec)...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28729534/uv-activated-zno-films-on-a-flexible-substrate-for-room-temperature-o2-and-h2o-sensing
#2
Christopher B Jacobs, Artem B Maksov, Eric S Muckley, Liam Collins, Masoud Mahjouri-Samani, Anton Ievlev, Christopher M Rouleau, Ji-Won Moon, David E Graham, Bobby G Sumpter, Ilia N Ivanov
We demonstrate that UV-light activation of polycrystalline ZnO films on flexible polyimide (Kapton) substrates can be used to detect and differentiate between environmental changes in oxygen and water vapor. The in-plane resistive and impedance properties of ZnO films, fabricated from bacteria-derived ZnS nanoparticles, exhibit unique resistive and capacitive responses to changes in O2 and H2O. We propose that the distinctive responses to O2 and H2O adsorption on ZnO could be utilized to statistically discriminate between the two analytes...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28725484/logarithmic-sensing-in-bacillus-subtilis-aerotaxis
#3
Filippo Menolascina, Roberto Rusconi, Vicente I Fernandez, Steven Smriga, Zahra Aminzare, Eduardo D Sontag, Roman Stocker
Aerotaxis, the directed migration along oxygen gradients, allows many microorganisms to locate favorable oxygen concentrations. Despite oxygen's fundamental role for life, even key aspects of aerotaxis remain poorly understood. In Bacillus subtilis, for example, there is conflicting evidence of whether migration occurs to the maximal oxygen concentration available or to an optimal intermediate one, and how aerotaxis can be maintained over a broad range of conditions. Using precisely controlled oxygen gradients in a microfluidic device, spanning the full spectrum of conditions from quasi-anoxic to oxic (60 n mol/l-1 m mol/l), we resolved B...
2017: NPJ Systems Biology and Applications
https://www.readbyqxmd.com/read/28724256/first-study-to-explore-the-feasibility-of-applying-microbial-fuel-cells-into-constructed-wetlands-for-cod-monitoring
#4
Lei Xu, Yaqian Zhao, Chuang Fan, Zhiren Fan, Fangchao Zhao
Chemical oxygen demand (COD) is one of the major targets to remove in constructed wetlands (CWs) system. Traditional method for COD measurement is a complex, time-consuming and highly toxic reagents participated procedure. In this study, microbial fuel cell (MFC) was successfully integrated into CW for indicating COD concentration. Results showed that there are two linear correlations between bioelectrical signals (output voltage from MFC) and COD concentration (acetate), which are COD from 0 to 500mg/L (101...
July 1, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28723171/detection-of-methanol-with-fast-response-by-monodispersed-indium-tungsten-oxide-ellipsoidal-nanospheres
#5
Chong Wang, Xueying Kou, Ning Xie, Lanlan Guo, Yanfeng Sun, Xiaohong Chuai, Jian Ma, Peng Sun, Yue Wang, Geyu Lu
Indium tungsten oxide ellipsoidal nanospheres were prepared with different In/W ratios by using a simple hydrothermal method without any surfactant for the first time. Sensors based on different In/W ratios samples were fabricated, and one of the samples exhibited better response to methanol compared with others. High content of defective oxygen (Ov) and proper output proportion of In to W might be the main reasons for the better gas sensing properties. The length of the nanosphere was about 150-200 nm, and the width was about 100 nm...
May 26, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28723168/enhanced-room-temperature-oxygen-sensing-properties-of-laocl-sno2-hollow-spheres-by-uv-light-illumination
#6
Ya Xiong, Wenbo Lu, Degong Ding, Lei Zhu, Xiaofang Li, Cuicui Ling, Qingzhong Xue
In this paper, a facile and elegant Green Chemistry method for the synthesis of SnO2 based hollow spheres has been investigated. The influences of doping, crystallite morphology, and operating condition on the O2 sensing performances of SnO2 based hollow-sphere sensors were comprehensively studied. It was indicated that, compared with undoped SnO2, 10 at. % LaOCl-doped SnO2 possessed better O2 sensing characteristics owing to an increase of specific surface area and oxygen vacancy defect caused by LaOCl dopant...
May 26, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28723115/response-of-gallium-nitride-chemiresistors-to-carbon-monoxide-is-due-to-oxygen-contamination
#7
Ravi Mohan Prasad, Stefan Lauterbach, Hans-Joachim Kleebe, Odile Merdrignac-Conanec, Nicolae Barsan, Udo Weimar, Aleksander Gurlo
We report on the influence of oxygen impurities on the gas sensing properties of gallium nitride (GaN) chemiresistors. As shown by XRD, elemental analysis, and TEM characterization, surface oxidation of GaN-for example, upon contact to ambient air atmosphere-creates an oxidative amorphous layer which provides the sites for the sensing toward CO. Treating this powder under dry ammonia at 800 °C converts the oxide layer in nitride, and consequently the sensing performance toward CO is dramatically reduced for ammonia treated GaN gas sensors...
June 23, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28723076/investigation-on-the-transformation-of-absorbed-oxygen-at-zno-101%C3%AC-0-surface-based-on-a-novel-thermal-pulse-method-and-density-functional-theory-simulation
#8
Tingqiang Yang, Yueli Liu, Wei Jin, Yiyang Han, Shuang Yang, Wen Chen
Absorbed oxygen plays a key role in gas sensing process of ZnO nanomaterials. In this work, the transformation of absorbed oxygen on ZnO (101̅0) and its effects on gas sensing properties to ethanol are studied by a novel thermal pulse method and density functional theory (DFT) simulation. Thermal pulse results reveal that the absorbed O2 molecule dissociates into two individual oxygen adatoms by extracting electrons from ZnO surface layers when temperature is above 443 K. The temperature at which absorbed O2 molecule begins to dissociate is the lowest working temperature for gas sensing...
July 19, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28722431/giant-o2-induced-photoluminescence-modulation-in-hierarchical-titanium-dioxide-nanostructures
#9
Deborah K Pallotti, Luca Passoni, Felice Gesuele, Pasqualino Maddalena, Fabio Di Fonzo, Stefano Lettieri
We demonstrate exceptionally large modulation of PL intensity in hierarchical titanium dioxide (TiO2) nanostructures exposed to molecular oxygen (O2). Optical responsivities up to about 1100% at 20% O2 concentrations are observed in hyperbranched anatase-phase hierarchical structures, outperforming those obtainable by commercial TiO2 nanopowders (up to a factor of ∼7 for response to synthetic air) and significantly improving the ones typically reported in PL-based opto-chemical gas sensing using MOXs. The improved PL response is discussed in terms of the specific morphology of hierarchical structures, characterized by simultaneous presence of small nanoparticles, large surface areas, and large voids...
January 27, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28722426/tunable-volatile-organic-compound-sensor-by-using-au-nanoparticle-incorporation-on-mos2
#10
Soo-Yeon Cho, Hyeong-Jun Koh, Hae-Wook Yoo, Jong-Seon Kim, Hee-Tae Jung
Controlling the charge concentrations of two-dimensional (2D) materials is a critical requirement for realizing versatility and potential application of these materials in high-performance electronics and sensors. In order to exploit the novel chemical-sensing characteristics of 2D materials for sensitive and selective sensors, various functionalization methods are needed to ensure efficient doping of channels based on 2D materials. In the present study, the gas-sensing performance of MoS2 has been significantly enhanced by controlled Au nanoparticle functionalization...
January 27, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28721857/stress-adaptation
#11
Alistair J P Brown, Leah E Cowen, Antonio di Pietro, Janet Quinn
Fungal species display an extraordinarily diverse range of lifestyles. Nevertheless, the survival of each species depends on its ability to sense and respond to changes in its natural environment. Environmental changes such as fluctuations in temperature, water balance or pH, or exposure to chemical insults such as reactive oxygen and nitrogen species exert stresses that perturb cellular homeostasis and cause molecular damage to the fungal cell. Consequently, fungi have evolved mechanisms to repair this damage, detoxify chemical insults, and restore cellular homeostasis...
July 2017: Microbiology Spectrum
https://www.readbyqxmd.com/read/28718619/radial-dopant-placement-for-tuning-plasmonic-properties-in-metal-oxide-nanocrystals
#12
Brandon M Crockett, Adam W Jansons, Kristopher M Koskela, Darren W Johnson, James E Hutchison
Doped metal oxide nanocrystals that exhibit tunable localized surface plasmon resonances (LSPRs) represent an intriguing class of nanomaterials that show promise for a variety of applications from spectroscopy to sensing. LSPRs arise in these materials through the introduction of aliovalent dopants and lattice oxygen vacancies. Tuning the LSPR shape and energy is generally accomplished through controlling the concentration or identity of dopants in a nanocrystal, but the lack of finer synthetic control leaves several fundamental questions unanswered regarding the effects of radial dopant placement, size, and nanocrystalline architecture on the LSPR energy and damping...
July 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28718507/gene-expression-analyses-reveal-metabolic-specifications-in-acute-o2-sensing-chemoreceptor-cells
#13
Lin Gao, Victoria Bonilla-Henao, Paula García-Flores, Ignacio Arias-Mayenco, Patricia Ortega-Sáenz, José López-Barneo
Acute O2 sensing is a fundamental property of cells in the peripheral chemoreceptors, e.g. glomus cells in the carotid body (CB) and chromaffin cells in the adrenal medulla (AM), and is necessary for adaptation to hypoxia. These cells contain O2 -sensitive ion channels, which mediate membrane depolarization and transmitter release upon exposure to hypoxia. However, the mechanisms underlying the detection of changes in O2 tension by cells are still poorly understood. Recently, we suggested that CB glomus cells have specific metabolic features that favour the accumulation of reduced quinone and the production of mitochondrial NADH and reactive oxygen species during hypoxia...
July 17, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28715034/surface-chemistry-and-stability-of-metastable-corundum-type-in2o3
#14
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/28707980/extranuclear-sirtuins-and-metabolic-stress
#15
Mahmoud Sobhy Elkhwanky, Jukka Hakkola
SIGNIFICANCE: Extranuclear sirtuins in cytosol (SIRT2) and mitochondria (SIRT3, SIRT4 and SIRT5) are key regulators of metabolic enzymes and the antioxidative defense mechanisms. They play an important role in the adjustment of metabolic pathways in alterations of the nutritional status. Recent Advances: Recent studies have shown that in addition to lysine deacetylation, sirtuins catalyze several different lysine deacylation reactions, removal of lipid modifications and ADP-ribosylation...
July 14, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28707593/effects-of-some-indigenous-plants-of-north-karnataka-india-on-cardiovascular-and-glucose-regulatory-systems-in-diabetic-rats
#16
Kusal K Das, Kailash S Chadchan, R Chandramouli Reddy, M S Biradar, Pallavi S Kanthe, Bheemshetty S Pati, Jeevan G Ambekar, Ishwar B Bagoji, Swastika Das
BACKGROUND: The medicinal plants of north Karnataka, India are always researchers delight as many of these plants are rarely found in elsewhere other than this part of India. Kenaf leaves (Hibiscus cannabinus Linn, Pundi), Chick pea leaves (Cicer arietinum Linn, Chana) and Prickly lettuce leaves (Lactuca scariola Linn, Hattaraki.) are a few of these indigenous plants which are routinely consumed by the people as diet in this part of India. Various studies were done on these plants to find out some potential anti diabetic efficacies but reports are still not encouraging...
July 12, 2017: Cardiovascular & Hematological Agents in Medicinal Chemistry
https://www.readbyqxmd.com/read/28705895/asymmetric-distribution-of-hypoxia-inducible-factor-%C3%AE-regulates-dorsoventral-axis-in-the-early-sea-urchin-embryo
#17
Wei-Lun Chang, Yi-Cheng Chang, Kuan-Ting Lin, Han-Ru Li, Chih-Yu Pai, Jen-Hao Chen, Yi-Hsien Su
Hypoxia signaling is an ancient pathway by which animals can respond to low oxygen. Malfunction of this pathway disturbs the hypoxic acclimation and results in various diseases, including cancers. The role of the hypoxia pathway in early embryogenesis remains unclear. Here, we show that in the sea urchin Strongylocentrotus purpuratus blastula, hypoxia-inducible factor α (HIFα), the downstream transcription factor of this pathway, is localized and transcriptionally active on the future dorsal side. This asymmetric distribution is attributable to its oxygen-sensing ability...
July 13, 2017: Development
https://www.readbyqxmd.com/read/28703005/hierarchical-nio-cube-nitrogen-doped-reduced-graphene-oxide-composite-with-enhanced-h2s-sensing-properties-at-low-temperature
#18
Ming Yang, Xian-Fa Zhang, Xiaoli Cheng, Ying-Ming Xu, Shan Gao, Hui Zhao, Li-Hua Huo
Novel hierarchical NiO cube (hc-NiO)/nitrogen-doped reduced graphene oxide (N-rGO) composite is synthesized via a facile hydrothermal method and a post-calcination treatment without any templates and surfactants addition. The NiO cubes assembled by abundant nanoparticles in-situ grow on the surface of N-rGO layers. The combination of hc-NiO and N-rGO results in enhanced sensing properties with the contributions of the N-rGO providing high specific surface area and more efficient active sites for the adsorption of H2S molecules and the hierarchically structured NiO cubes providing high sensitivity and distinctive selectivity to H2S gas...
July 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28702640/a-simple-high-yield-synthesis-of-high-purity-h%C3%A3-gg-carbide-%C3%AF-fe5c2-nanoparticles-with-extraordinary-electrochemical-properties
#19
Ondřej Malina, Petr Jakubec, Josef Kašlík, Jiří Tuček, Radek Zbořil
Iron carbides are of eminent interest in both fundamental scientific research and in the industry owing to their properties such as excellent mechanical strength and chemical inertness. They have been found very effective in Fischer-Tropsch synthesis exploring heterogeneous catalysis for the production of chemicals such as liquid fuel and they have also been employed as successful promoters for the oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER). However, so far there have been only a few reports on the application of iron carbide nanoparticles in the field of electrochemical sensing...
July 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/28702605/a-schiff-base-platform-structures-sensing-of-zn-ii-and-ppi-in-aqueous-medium-and-anticancer-activity
#20
Barnali Naskar, Ritwik Modak, Dilip K Maiti, Michael G B Drew, Antonio Bauzá, Antonio Frontera, Chitrangada Das Mukhopadhyay, Snehasis Mishra, Krishna Das Saha, Sanchita Goswami
A reaction of N1,N3-bis(3-methoxysalicylidene) diethylenetriamine (H2Vd) and Zn(NO3)2·6H2O, ZnBr2, ZnI2 and Cd(NO3)2·4H2O in a methanol solution led to zinc and cadmium complexes of different nuclearities, [Zn2(Vd·H)2(X)2]·CH3OH (X = NO3, Br, I) [1a, 1b and 1c] and Cd3(Vd)2(NO3)2 (2). In 1(a-c), two H2Vd ligands bridge the two metal centers whereas in 2, they provide sideways support to two terminal Cd(2+) ions, providing an all-oxygen envelope to the central Cd(2+) ion. All four compounds were characterized by elemental analysis, FT-IR spectroscopy and single crystal X-ray diffraction analysis...
July 12, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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