593 results match your criteria on-site oxygen

Functionalization of remote sensing and on-site data for simulating surface water dissolved oxygen: Development of hybrid tree-based artificial intelligence models.

Mar Pollut Bull 2021 Jul 14;170:112639. Epub 2021 Jul 14.

Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Viet Nam; New era and development in civil engineering research group, Scientific Research Center, Al-Ayen University, Thi-Qar 64001, Iraq.; College of Creative Design, Asia University, Taichung City, Taiwan. Electronic address:

Dissolved oxygen (DO) is an important indicator of river health for environmental engineers and ecological scientists to understand the state of river health. This study aims to evaluate the reliability of four feature selector algorithms i.e. Read More

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Enhanced Electrochemical HO Production via Two-Electron Oxygen Reduction Enabled by Surface-Derived Amorphous Oxygen-Deficient TiO.

ACS Appl Mater Interfaces 2021 Jul 12;13(28):33182-33187. Epub 2021 Jul 12.

Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China.

The electrochemical oxygen reduction reaction (ORR) is regarded as an attractive alternative to the anthraquinone process for sustainable and on-site hydrogen peroxide (HO) production. It is however hindered by low selectivity due to strong competition from the four-electron ORR and needs efficient catalysts to drive the 2e ORR. Here, an acid oxidation strategy is proposed as an effective strategy to boost the 2e ORR activity of metallic TiC via in-site generation of a surface amorphous oxygen-deficient TiO layer. Read More

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Case Report: "Killer Bee" Swarm Attacks in French Guiana: The Importance of Prompt Care.

Am J Trop Med Hyg 2021 Jul;105(1):225-229

4Centre Médical Interarmées, Cayenne, French Guiana.

In French Guiana, a French overseas region partly located in the Amazon, "Africanized" bees, a hybrid species of Brazilian bees known as "killer bees," have been observed since 1975. Since then, several cases requiring long hospitalization times have been described, allowing for a better understanding of the physiopathological mechanisms of this particular envenomation. Here, we report on a series of 10 cases of patients simultaneously attacked by hundreds of killer bees and immediately treated by a prehospital medical team already on site. Read More

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Acid volatile sulfides and simultaneously extracted metals: A new miniaturized 'purge and trap' system for laboratory and field measurements.

Talanta 2021 Oct 17;233:122490. Epub 2021 May 17.

Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, 38000, Grenoble, France.

In natural environments, Acid Volatile Sulfides (AVS) contained in anoxic waters or sediments, are composed of dissolved sulfides and neo-formed sulfides colloids or particles. Under acidic addition, AVS emit hydrogen sulfide gas and release the so-called simultaneously extracted metals (SEM). The measurement of AVS coupled with that of the SEM enables to evaluate the metal trapping capacity of sulfides in the environment. Read More

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October 2021

A Simple Sensor System for Onsite Monitoring of O in Vacuum-Packed Meats during the Shelf Life.

Sensors (Basel) 2021 Jun 22;21(13). Epub 2021 Jun 22.

School of Biochemistry and Cell Biology, University College Cork, T12 YT20 Cork, Ireland.

Vacuum packaging (VP) is used to reduce exposure of retail meat samples to ambient oxygen (O) and preserve their quality. A simple sensor system produced from commercial components is described, which allows for non-destructive monitoring of the O concentration in VP raw meat samples. Disposable O sensor inserts were produced by spotting small aliquots of the cocktail of the Pt-benzoporphyrin dye and polystyrene in ethyl acetate onto pieces of a PVDF membrane and allowing them to air-dry. Read More

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Lattice oxygen self-spillover on reducible oxide supported metal cluster: the water-gas shift reaction on Cu/CeO catalyst.

Chem Sci 2021 May 12;12(23):8260-8267. Epub 2021 May 12.

Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology Shenzhen Guangdong 518055 China

In this work we have tackled one of the most challenging problems in nanocatalysis namely understanding the role of reducible oxide supports in metal catalyzed reactions. As a prototypical example, the very well-studied water gas shift reaction catalyzed by CeO supported Cu nanoclusters is chosen to probe how the reducible oxide support modifies the catalyst structures, catalytically active sites and even the reaction mechanisms. By employing density functional theory calculations in conjunction with a genetic algorithm and molecular dynamics simulations, we have identified an unprecedented spillover of the surface lattice oxygen from the ceria support to the Cu cluster, which is rarely considered previously but may widely exist in oxide supported metal catalysts under realistic conditions. Read More

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Boosting the electrocatalytic performance of NiFe layered double hydroxides for the oxygen evolution reaction by exposing the highly active edge plane (012).

Chem Sci 2020 Oct 6;12(2):650-659. Epub 2020 Oct 6.

MOE Laboratory of Bioinorganic and Synthetic Chemistry, The Key Laboratory of Low-carbon Chemistry & Energy Conservation of Guangdong Province, School of Chemistry, Sun Yat-sen University Guangzhou 510275 China

The intrinsic activity of NiFe layer double hydroxides (LDHs) for the oxygen evolution reaction (OER) suffers from its predominantly exposed (003) basal plane, which is thought to have poor activity. Herein, we construct a hierarchal structure of NiFe LDH nanosheet-arrays-on-microplates (NiFe NSAs-MPs) to elevate the electrocatalytic activity of NiFe LDHs for the OER by exposing a high-activity plane, such as the (012) edge plane. It is surprising that the NiFe NSAs-MPs show activity of 100 mA cm at an overpotential () of 250 mV, which is five times higher than that of (003) plane-dominated NiFe LDH microsheet arrays (NiFe MSAs) at the same , representing the excellent electrocatalytic activity for the OER in alkaline media. Read More

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October 2020

Anoxia-reoxygenation alters HO efflux and sensitivity of redox centers to copper in heart mitochondria.

Comp Biochem Physiol C Toxicol Pharmacol 2021 Jun 16;248:109111. Epub 2021 Jun 16.

Department of Biomedical Sciences, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown C1A 4P3, PE, Canada. Electronic address:

Mitochondrial reactive oxygen species (ROS) have been implicated in organ damage caused by environmental stressors, prompting studies on the effect of oxygen deprivation and metal exposure on ROS metabolism. However, how anoxia and copper (Cu) jointly influence heart mitochondrial ROS metabolism is not understood. We used rainbow trout heart mitochondria to probe the effects of anoxia-reoxygenation and Cu on hydrogen peroxide (HO) emission during oxidation of palmitoylcarnitine (PC), succinate, or glutamate-malate. Read More

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Unplanted wetland-type filter for co-treatment of landfill leachate and septic tank wastewater: Analysing gravel replacement by plastic and passive (filling-emptied) aeration effects at pilot scale.

J Environ Manage 2021 Sep 10;294:112940. Epub 2021 Jun 10.

Department of Sciences and Techniques of Water and the Environment, School of Civil Engineering, University of Cantabria, Santander, Spain.

Nowadays, traditional residential and industrial wastewater treatment methods have been mainly developed as complex systems that consider costly infrastructure, which requires advanced control systems and highly qualified labour for their operation. The use of wetland-type infrastructure has been recognized both, by scientists and authorities, as an efficient and effective method to obtain good results in these processes. The most relevant elements in the design of horizontal subsurface filters are filtering media, as biofilm supporting material and flow control methods. Read More

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September 2021

Paper-based mediatorless enzymatic microfluidic biofuel cells.

Biosens Bioelectron 2021 Oct 9;190:113391. Epub 2021 Jun 9.

Dept. of Mechanical Engineering, BK21 FOUR ERICA-ACE Center, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan, Gyeonggi-do, 15588, South Korea. Electronic address:

In this study, eco-friendly and disposable paper-based membraneless microfluidic enzymatic fuel cells (EFCs) were developed without any mediators to reduce the toxicity and cost of EFCs. Glucose oxidase and laccase were immobilized on multi-walled carbon nanotube electrodes to catalyze the redox reaction of glucose and oxygen. Micromachining techniques well-suited for mass production were used to precisely fabricate micro-scale Y-shaped and cross-shaped EFCs. Read More

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October 2021

Beef cattle feedlot surface water containing multi-class agrochemicals elicits physiological and behavioral responses among Daphnia pulex.

Environ Monit Assess 2021 Jun 12;193(7):414. Epub 2021 Jun 12.

Department of Environmental Toxicology, Texas Tech University, Lubbock, TX, 79416, USA.

Despite increasing public concern about air and water pollution risks posed by concentrated animal feeding operation areas (CAFOs), there is little information about bioavailability and ecosystem impacts of agrochemicals used to increase productivity. In this study, we investigated the toxicity of wastewaters originating from beef cattle feeding operation on Daphnia pulex. Specifically, we assessed lethal and chronic sublethal exposure effects using various endpoints including survival, oxygen consumption, morphology, reproduction, and swimming behavior. Read More

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Rapid Potentiometric Detection of Chemical Oxygen Demand Using a Portable Self-Powered Sensor Chip.

Anal Chem 2021 06 8;93(24):8393-8398. Epub 2021 Jun 8.

School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China.

Chemical oxygen demand (COD) is an important indicator of organic pollutants in water bodies. Most of the present testing methods have the disadvantages of having complicated steps, being time-consuming, and using toxic and hazardous substances. In this work, rapid potentiometric detection of chemical oxygen demand (COD) using a portable self-powered sensor chip was successfully developed. Read More

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On-site substrate characterization in the anaerobic digestion context: A dataset of near infrared spectra acquired with four different optical systems on freeze-dried and ground organic waste.

Data Brief 2021 Jun 11;36:107126. Epub 2021 May 11.

INRAE, UMR ITAP, Montpellier University, Montpellier F-34000, France.

The near infrared spectra of thirty-three freeze-dried and ground organic waste samples of various biochemical composition were collected on four different optical systems, including a laboratory spectrometer, a transportable spectrometer with two measurement configurations (an immersed probe, and a polarized light system) and a micro-spectrometer. The provided data contains one file per spectroscopic system including the reflectance or absorbance spectra with the corresponding sample name and wavelengths. A reference data file containing carbohydrates, lipid and nitrogen content, biochemical methane potential (BMP) and chemical oxygen demand (COD) for each sample is also provided. Read More

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Modeling electrochemical properties of LiMn[Formula: see text]Co[Formula: see text]BO[Formula: see text] for cathode materials in lithium-ion rechargeable batteries.

Sci Rep 2021 Jun 4;11(1):11858. Epub 2021 Jun 4.

Instituto de Física, Universidade Federal da Bahia, Campus Universitario de Ondina, Salvador, Bahia, 40210-340, Brazil.

In this work, we report first-principle calculations of the electrochemical properties of lithitated and delithiated LiMn[Formula: see text]Co[Formula: see text]BO[Formula: see text] ([Formula: see text], 0.25, 0.5, 0. Read More

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Chemical Identification of Catalytically Active Sites on Oxygen-doped Carbon Nanosheet to Decipher the High Activity for Electro-synthesis Hydrogen Peroxide.

Angew Chem Int Ed Engl 2021 Jul 17;60(30):16607-16614. Epub 2021 Jun 17.

State Key Laboratory of Powder Metallurgy, School of Physical and Electronics, Central South University, 410083, Changsha, China.

Electrochemical production of hydrogen peroxide (H O ) through two-electron (2 e ) oxygen reduction reaction (ORR) is an on-site and clean route. Oxygen-doped carbon materials with high ORR activity and H O selectivity have been considered as the promising catalysts, however, there is still a lack of direct experimental evidence to identify true active sites at the complex carbon surface. Herein, we propose a chemical titration strategy to decipher the oxygen-doped carbon nanosheet (OCNS ) catalyst for 2 e ORR. Read More

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LCA and economic study on the local oxygen supply in Central Europe during the COVID-19 pandemic.

Sci Total Environ 2021 Sep 29;786:147401. Epub 2021 Apr 29.

AGH University of Science and Technology, Faculty of Energy and Fuels, Department of Coal Chemistry and Environmental Sciences, Al. Mickiewicza 30, 30-059 Kraków, Poland. Electronic address:

Medical oxygen is the key to survival for COVID-19 patients. To meet the pandemic-driven oxygen demand spike, local hospitals began searching for a suitable medical oxygen delivery system. Among the studies published on the impact of COVID-19 on a range of aspects, including the global economy and the environment, no study has been conducted on the environmental impact of medical oxygen supply to hospitals under epidemic conditions. Read More

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September 2021

Groundwater pollution assessment in a coastal aquifer in Cape Coast, Ghana.

Heliyon 2021 Apr 17;7(4):e06751. Epub 2021 Apr 17.

Environmental Science Department, University of Cape Coast, Ghana.

This work presents an assessment of the chemico-physical and microbial quality of water samples from hand-dug wells in the shallow aquifer of three communities neighbouring the University of Cape Coast, Ghana. Sanitary risk inspection was undertaken at each well location and the physical parameters including electrical conductivity, pH, Dissolved Oxygen (DO) and etc. were measured in situ via probes. Read More

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Effect of COD on methanotrophic growth and the anaerobic digestibility of its sludge as a further step for integration in WWTPS.

J Environ Manage 2021 Jul 19;290:112543. Epub 2021 Apr 19.

Department of Civil Engineering, Lassonde School of Engineering, York University, Toronto, ON, M3J 1P3, Canada. Electronic address:

Within wastewater treatment plants (WWTPs), the anaerobically produced biogas is often underutilized. Fortunately, methanotrophic based biotechnologies can be the remedy for on-site exploitation and recovery of unused biogas. In this regard, efforts have been placed on evaluating the suitably of methanotrophs to be deployed in WWTPs. Read More

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Extracorporeal membrane oxygenation network organisation and clinical outcomes during the COVID-19 pandemic in Greater Paris, France: a multicentre cohort study.

Lancet Respir Med 2021 04 19. Epub 2021 Apr 19.

Department of Cardiovascular and Thoracic Surgery, Pitié-Salpêtrière Hospital, AP-HP, Sorbonne University, Paris, France; Sorbonne University, INSERM UMRS_1166-ICAN, Institute of Cardiometabolism and Nutrition, Paris, France.

Background: In the Île-de-France region (henceforth termed Greater Paris), extracorporeal membrane oxygenation (ECMO) for severe acute respiratory distress syndrome (ARDS) was considered early in the COVID-19 pandemic. We report ECMO network organisation and outcomes during the first wave of the pandemic.

Methods: In this multicentre cohort study, we present an analysis of all adult patients with laboratory-confirmed SARS-CoV-2 infection and severe ARDS requiring ECMO who were admitted to 17 Greater Paris intensive care units between March 8 and June 3, 2020. Read More

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Elucidating the electronic structures of β-AgMoO and AgO nanocrystals theoretical and experimental approaches towards electrochemical water splitting and CO reduction.

Phys Chem Chem Phys 2021 Apr;23(15):9539-9552

Department of Chemistry, University of Birjand, Birjand, Iran.

In this paper, we demonstrate a combined theoretical and experimental study on the electronic structure, and the optical and electrochemical properties of β-Ag2MoO4 and Ag2O. These crystals were synthesized using the hydrothermal method and were characterized using X-ray diffraction (XRD), Rietveld refinement, and TEM techniques. XRD and Rietveld results confirmed that β-Ag2MoO4 has a spinel-type cubic structure. Read More

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A Remote Surveillance Platform to Monitor General Care Ward Surgical Patients for Acute Physiologic Deterioration.

Anesth Analg 2021 Apr 8. Epub 2021 Apr 8.

From the Department of Anesthesiology, Critical Care and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts.

Background: The traditional paradigm of hospital surgical ward care consists of episodic bedside visits by providers with periodic perusals of the patient's electronic health record (EHR). Vital signs and laboratory results are directly pushed to the EHR but not to providers themselves. Results that require intervention may not be recognized for hours. Read More

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Untargeted In Silico Compound Classification-A Novel Metabolomics Method to Assess the Chemodiversity in Bryophytes.

Int J Mol Sci 2021 Mar 23;22(6). Epub 2021 Mar 23.

Bioinformatics & Scientific Data, Leibniz Institute of Plant Biochemistry, Weinberg 3, 06120 Halle (Saale), Germany.

In plant ecology, biochemical analyses of bryophytes and vascular plants are often conducted on dried herbarium specimen as species typically grow in distant and inaccessible locations. Here, we present an automated in silico compound classification framework to annotate metabolites using an untargeted data independent acquisition (DIA)-LC/MS-QToF-sequential windowed acquisition of all theoretical fragment ion mass spectra (SWATH) ecometabolomics analytical method. We perform a comparative investigation of the chemical diversity at the global level and the composition of metabolite families in ten different species of bryophytes using fresh samples collected on-site and dried specimen stored in a herbarium for half a year. Read More

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Epigenetic Remodeling Hydrogel Patches for Multidrug-Resistant Triple-Negative Breast Cancer.

Adv Mater 2021 May 1;33(18):e2100949. Epub 2021 Apr 1.

State Key Laboratory of Oncogenes and Related Genes, Center for Single-Cell Omics, School of Public Health, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China.

The induced expansion of tumor-initiating cells (T-ICs) upon repeated exposure of tumors to chemotherapeutic drugs forms a major cause for chemoresistance and cancer metastasis. Here, a tumor-microenvironment-responsive hydrogel patch is designed to modulate the plasticity of T-ICs in triple-negative breast cancer (TNBC), which is insensitive to hormone- and HER2-targeting. The on-site formation of the hydrogel network patches tumors in a chemoresistant TNBC murine model and senses intratumoral reactive oxygen species for linker cleavage and payload release. Read More

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Nitrogen removal processes in lakes of different trophic states from on-site measurements and historic data.

Aquat Sci 2021 10;83(2):37. Epub 2021 Mar 10.

Eawag, Swiss Federal Institute of Aquatic Science and Technology, 6047 Kastanienbaum, Switzerland.

Freshwater lakes are essential hotspots for the removal of excessive anthropogenic nitrogen (N) loads transported from the land to coastal oceans. The biogeochemical processes responsible for N removal, the corresponding transformation rates and overall removal efficiencies differ between lakes, however, it is unclear what the main controlling factors are. Here, we investigated the factors that moderate the rates of N removal under contrasting trophic states in two lakes located in central Switzerland. Read More

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Co-reactant-free self-enhanced solid-state electrochemiluminescence platform based on polyluminol-gold nanocomposite for signal-on detection of mercury ion.

Sci Rep 2021 Mar 25;11(1):6932. Epub 2021 Mar 25.

Electrodics and Electrocatalysis Division, CSIR-Central Electrochemical Research Institute (CECRI), Karaikudi, Tamil Nadu, 630003, India.

Development of a self-enhanced solid-state ECL platform creates a straightforward experimental design for the fabrication of point-of-care applications. Herein, we develop a promising method for self-enhanced solid-state ECL platform of polyluminol gold nanocomposite on glassy carbon electrode [(PL-Au)/GCE] via simple one-step electrochemical deposition process without involving any additional co-reactants. The presence of gold nanoparticles (AuNPs) augments the electron transfer kinetics of PL (polyluminol) and enhances the solid-state ECL intensity and promotes label-free, excellent sensitivity, and selectivity to detect Hg in physiological pH through signal-on mode. Read More

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Evolved increases in hemoglobin-oxygen affinity and the Bohr effect coincided with the aquatic specialization of penguins.

Proc Natl Acad Sci U S A 2021 Mar;118(13)

School of Biological Sciences, University of Nebraska, Lincoln, NE 68588.

Dive capacities of air-breathing vertebrates are dictated by onboard O stores, suggesting that physiologic specialization of diving birds such as penguins may have involved adaptive changes in convective O transport. It has been hypothesized that increased hemoglobin (Hb)-O affinity improves pulmonary O extraction and enhances the capacity for breath-hold diving. To investigate evolved changes in Hb function associated with the aquatic specialization of penguins, we integrated comparative measurements of whole-blood and purified native Hb with protein engineering experiments based on site-directed mutagenesis. Read More

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Ductal ligation timing and neonatal outcomes: a 12-year bicentric comparison.

Eur J Pediatr 2021 Jul 13;180(7):2261-2270. Epub 2021 Mar 13.

Neonatal Intensive Care Unit, Department of Paediatrics, Addenbrooke's Hospital, Cambridge, UK.

Patent ductus arteriosus (PDA) is common among extremely preterm infants. In selected cases, surgical PDA ligation may be required. The timing for PDA ligation may depend upon a variety of factors, with potential clinical implications. Read More

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A novel comprehensive model of set pair analysis with extenics for river health evaluation and prediction of semi-arid basin - A case study of Wei River Basin, China.

Sci Total Environ 2021 Jun 14;775:145845. Epub 2021 Feb 14.

School of Geography and Tourism, Shaanxi Normal University, Xi'an 710119, Shaanxi, People's Republic of China.

The accelerated development of urbanization in semi-arid areas is easy to cause varying degrees of disturbance to its fragile aquatic ecosystem. To find a general method for assessing the health status in semi-arid basins in China, and to provide theoretical basis for river health management and sustainable development, this study is that health evaluation index system is established in the Wei River Basin, covering a huge semi-arid area, and analyzed the biological structure of plankton obtained by field sampling and identified in laboratory, chemical conditions including dissolved oxygen, water temperature, ammonia nitrogen, pH, chlorophyll and other water physical and chemical factors determined by field instruments and sediment heavy metals analyzed in laboratory, physical habitat scored on site and social factors including water resource utilization rate and water consumption per 10,000 yuan of GDP collected in local water resource bulletin. Based on the idea of game theory, an improved coupling model of set pair analysis with extenics is established to assess and predict health. Read More

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Influence of operational conditions and wastewater properties on the removal of organic micropollutants through ozonation.

J Environ Manage 2021 May 20;286:112205. Epub 2021 Feb 20.

Department of Chemical Engineering, Lund University, P O Box 124, SE-221 00 LUND, Sweden.

The objective of this study was to evaluate the influence of operational conditions and wastewater properties on the removal of pharmaceuticals, contrast media and antibiotics through ozonation, in order to facilitate the optimization of treatment and its implementation on a full scale. Pilot-scale ozone oxidation trials were performed on treated wastewater, before and after post-precipitation, over a seven-month period, including summer and winter months. Hydraulic retention times as short as 7 min were found to be sufficient for organic micropollutant removal. Read More

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