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https://www.readbyqxmd.com/read/28820935/accelerating-palladium-nanowire-h2-sensors-using-engineered-nanofiltration
#1
Won-Tae Koo, Shaopeng Qiao, Alana F Ogata, Gaurav Jha, Ji-Soo Jang, Vivian T Chen, Il-Doo Kim, Reginald M Penner
The oxygen, O2, in air interferes with the detection of H2 by palladium (Pd)-based H2 sensors, including Pd nanowires (NWs), depressing the sensitivity and retarding the response/recovery speed in air - relative to N2 or Ar. Here, we describe the preparation of H2 sensors in which a nanofiltration layer consisting of a Zn metal-organic-framework (MOF) is assembled onto Pd NWs. Polyhedron particles of Zn based zeolite imidazole framework (ZIF-8) were synthesized on lithographically patterned Pd NWs, leading to the creation of ZIF-8/Pd NWs bi-layered H2 sensors...
August 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28819004/acute-oxygen-sensing-by-the-carotid-body-from-mitochondria-to-plasma-membrane
#2
Andy J Chang
Maintaining oxygen homeostasis is crucial to the survival of animals. Mammals respond acutely to changes in blood oxygen levels by modulating cardiopulmonary function. The major sensor of blood oxygen that regulates breathing is the carotid body (CB), a small chemosensory organ located at the carotid bifurcation. When arterial blood oxygen levels drop in hypoxia, neuroendocrine cells in the CB called glomus cells are activated to signal to afferent nerves that project to the brainstem. The mechanism by which hypoxia stimulates CB sensory activity has been the subject of many studies over the last 90 years...
August 17, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28818792/regulation-of-type-i-interferon-responses-by-mitochondria-derived-reactive-oxygen-species-in-plasmacytoid-dendritic-cells
#3
Zsofia Agod, Tünde Fekete, Marietta M Budai, Aliz Varga, Attila Szabo, Hyelim Moon, Istvan Boldogh, Tamas Biro, Arpad Lanyi, Attila Bacsi, Kitti Pazmandi
Mitochondrial reactive oxygen species (mtROS) generated continuously under physiological conditions have recently emerged as critical players in the regulation of immune signaling pathways. In this study we have investigated the regulation of antiviral signaling by increased mtROS production in plasmacytoid dendritic cells (pDCs), which, as major producers of type I interferons (IFN), are the key coordinators of antiviral immunity. The early phase of type I IFN production in pDCs is mediated by endosomal Toll-like receptors (TLRs), whereas the late phase of IFN response can also be triggered by cytosolic retinoic acid-inducible gene-I (RIG-I), expression of which is induced upon TLR stimulation...
July 29, 2017: Redox Biology
https://www.readbyqxmd.com/read/28817955/redox-signaling-mechanisms-in-nervous-system-development
#4
Mauricio Olguín-Albuerne, Julio Morán
SIGNIFICANCE: Numerous studies have demonstrated the actions of reactive oxygen species (ROS) as regulators of several physiological processes. Here we discuss how the redox signaling mechanisms operate to control different processes such as neuronal differentiation, oligodendrocyte differentiation, dendritic growth, and axonal growth. Recent Advances: Redox homeostasis regulates the physiology of neural stem cells (NSCs). Notably, the neuronal differentiation process of NSCs is determined by a change towards an oxidative metabolism, increased levels of mitochondrial ROS, increased activity of NOX enzymes, decreased levels of Nrf2, and a differential regulation of different redoxins...
August 17, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28817079/insight-into-the-mechanism-of-co-oxidation-on-wo%C3%A2-001-surfaces-for-gas-sensing-a-dft-study
#5
Hua Jin, Hegen Zhou, Yongfan Zhang
The mechanism of CO oxidation on the WO₃(001) surface for gas sensing performance has been systematically investigated by means of first principles density functional theory (DFT) calculations. Our results show that the oxidation of CO molecule on the perfect WO₃(001) surface induces the formation of surface oxygen vacancies, which results in an increase of the surface conductance. This defective WO₃(001) surface can be re-oxidized by the O₂ molecules in the atmosphere. During this step, the active O₂(-) species is generated, accompanied with the obvious charge transfer from the surface to O₂ molecule, and correspondingly, the surface conductivity is reduced...
August 17, 2017: Sensors
https://www.readbyqxmd.com/read/28812765/rational-design-of-polymeric-core-shell-ratiometric-oxygen-sensing-nanostructures
#6
Aisling Byrne, Jaco Jacobs, Christopher S Burke, Aaron Martin, Andreas Heise, Tia E Keyes
A new approach for the fabrication of luminescent ratiometric sensing nanosensors is described using core-shell nanoparticles in which the probe and reference are spatially separated into the shell and core of the nanostructure respectively. The isolation of the reference in the core of the particle ensures a stable emission reference signal unaffected by the external environment. The core shell structure was prepared by engineering structurally well-defined Ru-conjugated block copolymers which acted as emulsifiers in the miniemulsion polymerisation of BODIPY loaded styrene nanoparticles...
August 16, 2017: Analyst
https://www.readbyqxmd.com/read/28805370/chirality-transfer-from-chiral-monoamines-to-an-m-phthalic-diamide-linked-zinc-bisporphyrinate-with-a-benzylamide-substituent
#7
Qingyun Hu, Congcong Zhuo, Yong Wang, Chuanjiang Hu, Jianping Lang
An m-phthalic diamide-linked bisporphyrin with a benzylamide substituent has been designed and synthesized. It has two types of carbonyl groups. In the solution of this zinc bisporphyrinate, these carbonyl groups are involved in the formation of two different Zn-O coordination interactions: one is formed between neighboring zinc bisporphyrinates; another is formed within zinc bisporphyrinate. The chirality sensing abilities of this zinc porphyrinate to a number of chiral monoamines have been examined. When zinc bisporphyrinate was mixed with a series of chiral monoamines, the signs of the circular dichroism spectra for the chiral monoamines of the same handedness with an aryl group as the substituent are just opposite to those with an alkyl group as the substituent...
August 14, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28802136/the-role-of-sulfate-in-aerobic-granular-sludge-process-for-emerging-sulfate-laden-wastewater-treatment
#8
Weiqi Xue, Tianwei Hao, Hamish R Mackey, Xiling Li, Richard C Chan, Guanghao Chen
Sulfate-rich wastewaters pose a major threat to mainstream wastewater treatment due to the unpreventable production of sulfide and associated shift in functional bacteria. Aerobic granular sludge could mitigate these challenges in view of its high tolerance and resilience against changes in various environmental conditions. This study aims to confirm the feasibility of aerobic granular sludge in the treatment of sulfate containing wastewater, investigate the impact of sulfate on nutrient removal and granulation, and reveal metabolic relationships in the above processes...
August 4, 2017: Water Research
https://www.readbyqxmd.com/read/28802090/assessment-of-the-dynamics-of-human-glymphatic-system-by-near-infrared-spectroscopy-nirs
#9
Teemu Myllylä, Markus Harju, Vesa Korhonen, Alexander Bykov, Vesa Kiviniemi, Igor Meglinski
Fluctuations in brain water content has attracted increasing interest, particularly as regards studies of the glymphatic system, which is connected with the complex organisation of dural lymphatic vessels, responsible for cleaning tissue. Disturbances of glymphatic circulation are associated with several brain disorders, including dementia. This paper introduces an approach to non-invasive measurement of water dynamics in the human brain utilizing near-infrared spectroscopy (NIRS). We demonstrate the possibility to sense dynamic variations of water content between the skull and grey matter, for instance, in the subarachnoid space...
August 12, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28801640/spectroscopic-observation-of-oxygen-dissociation-on-nitrogen-doped-graphene
#10
Mattia Scardamaglia, Toma Susi, Claudia Struzzi, Rony Snyders, Giovanni Di Santo, Luca Petaccia, Carla Bittencourt
Carbon nanomaterials' reactivity towards oxygen is very poor, limiting their potential applications. However, nitrogen doping is an established way to introduce active sites that facilitate interaction with gases. This boosts the materials' reactivity for bio-/gas sensing and enhances their catalytic performance for the oxygen reduction reaction. Despite this interest, the role of differently bonded nitrogen dopants in the interaction with oxygen is obscured by experimental challenges and has so far resisted clear conclusions...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28800225/automated-in-situ-oxygen-profiling-at-aquatic-terrestrial-interfaces
#11
Tanja Brandt, Michael Vieweg, Gerrit Laube, Robert Schima, Tobias Goblirsch, Jan H Fleckenstein, Christian Schmidt
Optical sensing technologies provide opportunities for in situ oxygen sensing capable of capturing the whole range of spatial and temporal variability. We developed a miniaturized Distributed Oxygen Sensor ('mDOS') specifically for long-term in situ application in soil and sediment. The mDOS sensor system enables the unattended, repeated acquisition of time series of in situ oxygen profiles at a sub-cm resolution covering a depth of up to one meter. Compared to existing approaches, this provides the possibility to reveal highly variable and heterogenous oxygen dynamics at a high, quasi-continuous resolution across both scales...
August 11, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28799693/the-small-rna-real-a-novel-regulatory-element-embedded-in-the-pseudomonas-aeruginosa-quorum-sensing-networks
#12
Sara Carloni, Raffaella Macchi, Sara Sattin, Silvia Ferrara, Giovanni Bertoni
The small RNA ReaL of the opportunistic pathogen Pseudomonas aeruginosa has been characterized. Our results indicate that ReaL contributes to P. aeruginosa virulence. In the Galleria mellonella infection model, reaL gene deletion resulted in decreased virulence, while ReaL overexpression resulted in a hyper-virulent phenotype. We also demonstrate that ReaL is embedded in the P. aeruginosa quorum sensing (QS) with the role of linking las to pqs systems. We show that ReaL is negatively regulated by the las regulator LasR and impacts positively the synthesis of the pqs quinolone signal PQS by a positive post-transcriptional effect on the pqsC gene...
August 11, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28798696/phylogenetic-and-molecular-evolutionary-analysis-of-mitophagy-receptors-under-hypoxic-conditions
#13
Xiaomei Wu, Fei-Hua Wu, Qianrong Wu, Shu Zhang, Suping Chen, Matthew Sima
As animals evolved to use oxygen as the main strategy to produce ATP through the process of mitochondrial oxidative phosphorylation, the ability to adapt to fluctuating oxygen concentrations is a crucial component of evolutionary pressure. Three mitophagy receptors, FUNDC1, BNIP3 and NIX, induce the removal of dysfunctional mitochondria (mitophagy) under prolonged hypoxic conditions in mammalian cells, to maintain oxygen homeostasis and prevent cell death. However, the evolutionary origins and structure-function relationships of these receptors remain poorly understood...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28796258/loss-of-phd3-in-myeloid-cells-dampens-the-inflammatory-response-and-fibrosis-after-hind-limb-ischemia
#14
Angelika Beneke, Annemarie Guentsch, Annette Hillemann, Anke Zieseniss, Lija Swain, Dörthe M Katschinski
Macrophages are essential for the inflammatory response after an ischemic insult and thereby influence tissue recovery. For the oxygen sensing prolyl-4-hydroxylase domain enzyme (PHD) 2 a clear impact on the macrophage-mediated arteriogenic response after hind-limb ischemia has been demonstrated previously, which involves fine tuning a M2-like macrophage population. To analyze the role of PHD3 in macrophages, we performed hind-limb ischemia (ligation and excision of the femoral artery) in myeloid-specific PHD3 knockout mice (PHD3(-/-)) and analyzed the inflammatory cell invasion, reperfusion recovery and fibrosis in the ischemic muscle post-surgery...
August 10, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28796167/inhomogeneous-oxygen-vacancy-distribution-in-semiconductor-gas-sensors-formation-migration-and-determination-on-gas-sensing-characteristics
#15
REVIEW
Jianqiao Liu, Yinglin Gao, Xu Wu, Guohua Jin, Zhaoxia Zhai, Huan Liu
The density of oxygen vacancies in semiconductor gas sensors was often assumed to be identical throughout the grain in the numerical discussion of the gas-sensing mechanism of the devices. In contrast, the actual devices had grains with inhomogeneous distribution of oxygen vacancy under non-ideal conditions. This conflict between reality and discussion drove us to study the formation and migration of the oxygen defects in semiconductor grains. A model of the gradient-distributed oxygen vacancy was proposed based on the effects of cooling rate and re-annealing on semiconductive thin films...
August 10, 2017: Sensors
https://www.readbyqxmd.com/read/28795796/hyper-branched-phosphorescent-conjugated-polymer-dots-with-iridium-iii-complex-as-the-core-for-hypoxia-imaging-and-photodynamic-therapy
#16
Zhiying Feng, Peng Tao, Liang Zou, Pengli Gao, Yuan Liu, Xing Liu, Hua Wang, Shujuan Liu, Qingchen Dong, Jie Li, Bingshe Xu, Wei Huang, Raymond Wai Yeung Wong, Qiang Zhao
Real-time monitoring the contents of molecular oxygen (O2) in tumor cells is of great significance in early diagnosis of cancer. At the same time, the photodynamic therapy (PDT) could be realized by highly toxic singlet oxygen (1O2) generated in situ during the O2 sensing, making it one of the most promising methods for cancer therapy. Herein, the iridium(III) complex cored hyper-branched phosphorescent conjugated polymer dots with the negative charges for hypoxia imaging and highly efficient PDT was rationally designed and synthesized...
August 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28794695/water-filtered-infrared-a-wira-overcomes-swallowing-disorders-and-hypersalivation-a-case-report
#17
Gerd Hoffmann
Case description: A patient with a Barrett oesophageal carcinoma and a resection of the oesophagus with gastric pull-up developed swallowing disorders 6 years and 2 months after the operation. Within 1 year and 7 months two recurrences of the tumor at the anastomosis were found and treated with combined chemoradiotherapy or chemotherapy respectively. 7 years and 9 months after the operation local tumor masses and destruction were present with no ability to orally drink or eat (full feeding by jejunal PEG tube): quality of life was poor, as saliva and mucus were very viscous (pulling filaments) and could not be swallowed and had to be spat out throughout the day and night resulting in short periods of sleep (awaking from the necessity to spit out)...
2017: German Medical Science: GMS E-journal
https://www.readbyqxmd.com/read/28790514/the-vhl-tumor-suppressor-gene-insights-into-oxygen-sensing-and-cancer
#18
William G Kaelin
Mammalian cells sense changes in oxygen and transduce that information into adaptive changes in gene expression using a conserved pathway that converges on the heterodimeric transcription factor called hypoxia-inducible factor (HIF), which contains a labile alpha subunit and a stable beta subunit. In the presence of oxygen, the alpha subunit is hydroxylated on one (or both) of two highly conserved prolyl residues by an Egg-Laying Defective Nine (EglN) [also called Prolyl Hydroxylase Domain (PHD)] dioxygenase, which recruits an ubiquitin ligase complex containing the VHL tumor suppressor gene product...
2017: Transactions of the American Clinical and Climatological Association
https://www.readbyqxmd.com/read/28781126/targeting-mycobacterium-tuberculosis-sensitivity-to-thiol-stress-at-acidic-ph-kills-the-bacterium-and-potentiates-antibiotics
#19
Garry B Coulson, Benjamin K Johnson, Huiqing Zheng, Christopher J Colvin, Robert J Fillinger, Elizabeth R Haiderer, Neal D Hammer, Robert B Abramovitch
Mycobacterium tuberculosis (Mtb) must sense and adapt to immune pressures such as acidic pH during pathogenesis. The goal of this study was to isolate compounds that inhibit acidic pH resistance, thus defining virulence pathways that are vulnerable to chemotherapy. Here, we report that the compound AC2P36 selectively kills Mtb at acidic pH and potentiates the bactericidal activity of isoniazid, clofazimine, and diamide. We show that AC2P36 activity is associated with thiol stress and causes an enhanced accumulation of intracellular reactive oxygen species at acidic pH...
August 17, 2017: Cell Chemical Biology
https://www.readbyqxmd.com/read/28777961/ultra-sensitive-nh3-sensor-based-on-flower-shaped-sns2-nanostructures-with-sub-ppm-detection-ability
#20
Ya Xiong, Wangwang Xu, Degong Ding, Wenbo Lu, Lei Zhu, Zongye Zhu, Ying Wang, Qingzhong Xue
Layered metal dichalcogenides (LMDs) semiconducting materials have recently attracted tremendous attention as high performance gas sensors due to unique chemical and physical properties of thin layers. Here, three-dimensional SnS2 nanoflower structures assembled with thin nanosheets were synthesized via a facile solvothermal process. When applied to detect 100ppm NH3 at 200°C, the SnS2 based sensor exhibited high response value of 7.4, short response/recovery time of 40.6s/624s. Moreover, the sensor demonstrated a low detection limit of 0...
July 25, 2017: Journal of Hazardous Materials
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