keyword
MENU ▼
Read by QxMD icon Read
search

Oxygen concentrator

keyword
https://www.readbyqxmd.com/read/29454269/biological-effects-of-four-iron-containing-nanoremediation-materials-on-the-green-alga-chlamydomonas-sp
#1
Nhung H A Nguyen, Nadia R Von Moos, Vera I Slaveykova, Katrin Mackenzie, Rainer U Meckenstock, Silke Thűmmler, Julian Bosch, Alena Ševců
As nanoremediation strategies for in-situ groundwater treatment extend beyond nanoiron-based applications to adsorption and oxidation, ecotoxicological evaluations of newly developed materials are required. The biological effects of four new materials with different iron (Fe) speciations ([i] FerMEG12 - pristine flake-like milled Fe(0) nanoparticles (nZVI), [ii] Carbo-Iron ® - Fe(0)-nanoclusters containing activated carbon (AC) composite, [iii] Trap-Ox® Fe-BEA35 (Fe-zeolite) - Fe-doped zeolite, and [iv] Nano-Goethite - 'pure' FeOOH) were studied using the unicellular green alga Chlamydomonas sp...
February 14, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29454199/benthic-nitrite-exchanges-in-the-seine-river-france-an-early-diagenetic-modeling-analysis
#2
Zahra Akbarzadeh, Anniet M Laverman, Fereidoun Rezanezhad, Mélanie Raimonet, Eric Viollier, Babak Shafei, Philippe Van Cappellen
Nitrite is a toxic intermediate compound in the nitrogen (N) cycle. Elevated concentrations of nitrite have been observed in the Seine River, raising questions about its sources and fate. Here, we assess the role of bottom sediments as potential sources or sinks of nitrite along the river continuum. Sediment cores were collected from two depocenters, one located upstream, the other downstream, from the largest wastewater treatment plant (WWTP) servicing the conurbation of Paris. Pore water profiles of oxygen, nitrate, nitrite and ammonium were measured...
February 14, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29454171/reactive-oxygen-and-iron-species-monitoring-to-investigate-the-electro-fenton-performances-impact-of-the-electrochemical-process-on-the-biodegradability-of-metronidazole-and-its-by-products
#3
Arwa Aboudalle, Florence Fourcade, Aymen Amin Assadi, Lionel Domergue, Hayet Djelal, Thomas Lendormi, Samir Taha, Abdeltif Amrane
In this study, the monitoring of reactive oxygen species and the regeneration of the ferrous ions catalyst were performed during electro-Fenton (EF) process to highlight the influence of operating parameters. The removal of metronidazole (MTZ) was implemented in an electrochemical mono-compartment batch reactor under various ranges of current densities, initial MTZ and ferrous ions concentrations, and pH values. It was found that under 0.07 mA cm -2 , 0.1 mM of ferrous ions and pH = 3, the efficiency of 100 mg L -1 MTZ degradation and mineralization were 100% within 20 min and 40% within 135 min of electrolysis, respectively...
February 13, 2018: Chemosphere
https://www.readbyqxmd.com/read/29454160/vascular-parameters-continue-to-decrease-post-exposure-with-simultaneous-but-not-individual-exposure-to-bpa-and-hypoxia-in-zebrafish-larvae
#4
Alysha D Cypher, Bryce Fetterman, Brian Bagatto
How fish respond to hypoxia, a common stressor, can be altered by simultaneous exposure to pollutants like bisphenol A (BPA), a plasticizer. BPA is cardiotoxic and interferes with the hypoxia inducible factor pathway (HIF-1α), therefore disrupting the hypoxic response. Co-exposure to hypoxia and BPA also causes severe bradycardia and reduced cardiac output in zebrafish larvae. The purpose of this work was to determine how the cardiovascular effects of co-exposure vary with BPA concentration and persist beyond exposure...
February 14, 2018: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/29454149/study-of-manganese-binding-to-the-ferroxidase-centre-of-human-h-type-ferritin
#5
Matteo Ardini, Barry D Howes, Annarita Fiorillo, Elisabetta Falvo, Silvia Sottini, Donella Rovai, Marco Lantieri, Andrea Ilari, Dante Gatteschi, Gabriele Spina, Emilia Chiancone, Simonetta Stefanini, Maria Fittipaldi
Ferritins are ubiquitous and conserved proteins endowed with enzymatic ferroxidase activity, that oxidize Fe(II) ions at the dimetal ferroxidase centre to form a mineralized Fe(III) oxide core deposited within the apo-protein shell. Herein, the in vitro formation of a heterodimetal cofactor constituted by Fe and Mn ions has been investigated in human H ferritin (hHFt). Namely, Mn and Fe binding at the hHFt ferroxidase centre and its effects on Fe(II) oxidation have been investigated by UV-Vis ferroxidation kinetics, fluorimetric titrations, multifrequency EPR, and preliminary Mössbauer spectroscopy...
February 9, 2018: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/29453918/high-dose-of-histone-deacetylase-inhibitors-affects-insulin-secretory-mechanism-of-pancreatic-beta-cell-line
#6
Eiji Yamato
OBJECTIVE: Histone deacytylase inhibitors (HDACis) inhibit the deacetylation of the lysine residue of proteins, including histones, and regulate the transcription of a variety of genes. Recently, HDACis have been used clinically as anti-cancer drugs and possible anti-diabetic drugs. Even though HDACis have been proven to protect the cytokine-induced damage of pancreatic beta cells, evidence also shows that high doses of HDACis are cytotoxic. In the present study, we, therefore, investigated the eff ect of HDACis on insulin secretion in a pancreatic beta cell line...
January 1, 2018: Endocrine Regulations
https://www.readbyqxmd.com/read/29453570/molecular-mechanisms-and-signaling-pathways-involved-in-the-nutritional-support-of-spermatogenesis-by-sertoli-cells
#7
Luís Crisóstomo, Marco G Alves, Agostina Gorga, Mário Sousa, María F Riera, María N Galardo, Silvina B Meroni, Pedro F Oliveira
Sertoli cells play a central role in spermatogenesis. They maintain the blood-testis barrier, an essential feature of seminiferous tubules which creates the proper environment for the occurrence of the spermatogenesis. However, this confinement renders germ cells almost exclusively dependent on Sertoli cells' nursing function and support. Throughout spermatogenesis, differentiating sperm cells become more specialized, and their biochemical machinery is insufficient to meet their metabolic demands. Although the needs are not the same at all differentiation stages, Sertoli cells are able to satisfy their needs...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29453538/nickel-oxide-nanoparticles-induced-transcriptomic-alterations-in-hepg2-cells
#8
Quaiser Saquib, Maqsood A Siddiqui, Javed Ahmad, Sabiha M Ansari, Mohammad Faisal, Rizwan Wahab, Abdulrahman A Alatar, Abdulaziz A Al-Khedhairy, Javed Musarrat
Nickel oxide nanoparticles (NiO-NPs) are increasingly used and concerns have been raised on its toxicity. Although a few studies have reported the toxicity of NiO-NPs, a comprehensive understanding of NiO-NPs toxicity in human cells is still lagging. In this study, we integrated transcriptomic approach and genotoxic evidence to depict the mechanism of NiO-NPs toxicity in human hepatocellular carcinoma (HepG2) cells. DNA damage analysis was done using comet assay, which showed 26-fold greater tail moment in HepG2 cells at the highest concentration of 100 μg/ml...
2018: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29453012/membrane-bioreactor-performance-in-treating-algiers-landfill-leachate-from-using-indigenous-bacteria-and-inoculating-with-activated-sludge
#9
Latifa Azzouz, Nouara Boudjema, Fares Aouichat, Mohamed Kherat, Nabil Mameri
This study focuses on the treatment of both organic and metallic pollution in the Staoueli landfill leachate. This leachate contains a large amount of organic and inorganic matter and it must imperatively be treated before being released into the environment. Our work presents a comparative study between two membrane sequenced batch bioreactors (B2 contains indigenous leachate bacteria and B1 contains activated sludge). The purpose is to assess the best treatment to use, one that allows the reduction of the polluting load of the leachate and a reduction of membrane fouling...
February 13, 2018: Waste Management
https://www.readbyqxmd.com/read/29452816/transnasal-humidified-rapid-insufflation-ventilatory-exchange-for-oxygenation-of-children-during-apnoea-a-prospective-randomised-controlled-trial
#10
T Riva, T H Pedersen, S Seiler, N Kasper, L Theiler, R Greif, M Kleine-Brueggeney
BACKGROUND: Transnasal humidified rapid insufflation ventilatory exchange (THRIVE) comprises the administration of heated, humidified, and blended air/oxygen mixtures via nasal cannula at rates of ≥2 litres kg -1 min -1 . The aim of this randomized controlled study was to evaluate the length of the safe apnoea time using THRIVE with two different oxygen concentrations (100% vs 30% oxygen) compared with standard low-flow 100% oxygen administration. METHODS: Sixty patients, aged 1-6 yr, weighing 10-20 kg, undergoing general anaesthesia for elective surgery, were randomly allocated to receive one of the following oxygen administration methods during apnoea: 1) low-flow 100% oxygen at 0...
March 2018: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/29452593/a-review-on-biosynthesis-of-silver-nanoparticles-and-their-biocidal-properties
#11
REVIEW
Khwaja Salahuddin Siddiqi, Azamal Husen, Rifaqat A K Rao
Use of silver and silver salts is as old as human civilization but the fabrication of silver nanoparticles (Ag NPs) has only recently been recognized. They have been specifically used in agriculture and medicine as antibacterial, antifungal and antioxidants. It has been demonstrated that Ag NPs arrest the growth and multiplication of many bacteria such as Bacillus cereus, Staphylococcus aureus, Citrobacter koseri, Salmonella typhii, Pseudomonas aeruginosa, Escherichia coli, Klebsiella pneumonia, Vibrio parahaemolyticus and fungus Candida albicans by binding Ag/Ag + with the biomolecules present in the microbial cells...
February 16, 2018: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/29451742/real-time-monitoring-prefrontal-activities-during-online-video-game-playing-by-functional-near-infrared-spectroscopy
#12
Yue Li, Lei Zhang, Kehong Long, Hui Gong, Hao Lei
A growing body of literature has suggested that video game playing can induce functional and structural plasticity of the brain. The underlying mechanisms, however, remain poorly understood. In this study, functional near-infrared spectroscopy (fNIRS) was used to record prefrontal activities in 24 experienced game players when they played a massively multiplayer online battle arena (MOBA) video game, League of Legends (LOL), under naturalistic conditions. It was observed that game onset was associated with significant activations in the ventrolateral prefrontal cortex (VLPFC) and concomitant deactivations in the dorsolateral prefrontal cortex (DLPFC) and frontal pole area (FPA)...
February 16, 2018: Journal of Biophotonics
https://www.readbyqxmd.com/read/29451722/enhanced-photodynamic-therapy-by-reduced-intracellular-glutathione-levels-employing-nano-mof-with-cu-ii-as-active-center
#13
Wei Zhang, Jun Lu, Xiaonan Gao, Ping Li, Wen Zhang, Yu Ma, Hui Wang, Bo Tang
In photodynamic therapy (PDT), the level of reactive oxygen species (ROS) produced in the cell directly determines therapeutic effect. Therefore, the development of photosensitizers combining the ability of reducing GSH levels through synergistically improving ROS concentration to strengthen the efficacy of PDT for tumor is important. We report a nano-metal-organic framework based on Cu (II) as active center for PDT. This MOF-2 is readily uptaken by breast cancer cells, and high-level ROS is generated under light irradiation...
February 16, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29451417/coumestrol-confers-partial-resistance-in-soybean-plants-against-cercospora-leaf-blight
#14
Eduardo Chagas Silva, Pramuditha L Abhayawardhana, Anatoliy V Lygin, Clark L Robertson, Mei Liu, Zhijun Liu, Raymond W Schneider
Although previous research showed that the purple symptom of Cercospora leaf blight (CLB) is associated with lower biomass of Cercospora cf. flagellaris and lower concentrations of cercosporin, a reactive oxygen species producer, as compared to blighted leaves, the hypothesis that the purple symptom is a plant reaction to the pathogen has never been tested. In this study, we demonstrated that high levels of coumestrol (COU) were associated with purple symptoms of CLB and that COU has strong antioxidant activity...
February 16, 2018: Phytopathology
https://www.readbyqxmd.com/read/29451383/arsenic-speciation-in-mekong-delta-sediments-depends-on-their-depositional-environment
#15
Yuheng Wang, Pierre Le Pape, Guillaume Morin, Maria Asta, Georgina King, Barbora Bartova, Elena Suvorova, Manon Frutschi, Maya Ikogou, Vu Hoai Cong Pham, Phu Le Vo, Frédéric Herman, Laurent Charlet, Rizlan Bernier-Latmani
Arsenic (As) contamination in groundwater is pervasive throughout deltaic regions of Southeast Asia and threatens the health of millions. The speciation of As in sediments overlying contaminated aquifers is poorly constrained. Here, we investigate the chemical and mineralogical compositions of sediment cores collected from the Mekong Delta in Vietnam, elucidate the speciation of iron and arsenic, and relate them to the sediment depositional environment. Gradual dissolution of ferric (oxyhydr)oxides with depth is observed down to 7 m, corresponding to the establishment of reducing conditions...
February 16, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29450773/influence-of-mn-2-ions-on-the-corrosion-mechanism-of-lead-based-anodes-and-the-generation-of-heavy-metal-anode-slime-in-zinc-sulfate-electrolyte
#16
Chenmu Zhang, Ning Duan, Linhua Jiang, Fuyuan Xu, Jin Luo
The influence of Mn 2+ ions on the generation of heavy metal anode slime during zinc electrolysis industry was extensively investigated using several electrochemical methods, electron microscope technologies, and particle size analysis. Results showed that the Mn 2+ could obviously promote oxygen evolution reaction (OER) and thereby weaken oxidation efficiency of Mn 2+ (η MnO2 ) and dissolution of Pb 2+ . The significant improvement in kinetic parameters for OER was found in electrolytes of 1 and 3 g/L Mn 2+ , but became unstable as the Mn 2+ concentration increased to 10 g/L...
February 15, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29450746/impact-of-habitat-heterogeneity-on-zooplankton-assembly-in-a-temperate-river-floodplain-system
#17
Anita Galir Balkić, Ivančica Ternjej, Irella Bogut
Dissimilar life features of Rotifera, Cladocera and Copepoda enable these organisms to respond differently to changes in the hydrological regime which influence alterations in environmental characteristics. We investigated the effect of habitat heterogeneity (e.g. eupotamal, parapotamal, palaeopotamal) on individual zooplankton group assemblages and biodiversity indices (α, β and γ diversity) during hydro regime change in floodplain waterbodies. Dissolved oxygen and organic nitrogen concentrations changed significantly among hydrological states while water depth was affected by both site and hydro regime replacement...
February 15, 2018: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29450594/position-paper-for-the-organization-of-ecmo-programs-for-cardiac-failure-in-adults
#18
Darryl Abrams, A Reshad Garan, Akram Abdelbary, Matthew Bacchetta, Robert H Bartlett, James Beck, Jan Belohlavek, Yih-Sharng Chen, Eddy Fan, Niall D Ferguson, Jo-Anne Fowles, John Fraser, Michelle Gong, Ibrahim F Hassan, Carol Hodgson, Xiaotong Hou, Katarzyna Hryniewicz, Shingo Ichiba, William A Jakobleff, Roberto Lorusso, Graeme MacLaren, Shay McGuinness, Thomas Mueller, Pauline K Park, Giles Peek, Vin Pellegrino, Susanna Price, Erika B Rosenzweig, Tetsuya Sakamoto, Leonardo Salazar, Matthieu Schmidt, Arthur S Slutsky, Christian Spaulding, Hiroo Takayama, Koji Takeda, Alain Vuylsteke, Alain Combes, Daniel Brodie
Extracorporeal membrane oxygenation (ECMO) has been used increasingly for both respiratory and cardiac failure in adult patients. Indications for ECMO use in cardiac failure include severe refractory cardiogenic shock, refractory ventricular arrhythmia, active cardiopulmonary resuscitation for cardiac arrest, and acute or decompensated right heart failure. Evidence is emerging to guide the use of this therapy for some of these indications, but there remains a need for additional evidence to guide best practices...
February 15, 2018: Intensive Care Medicine
https://www.readbyqxmd.com/read/29450430/facile-synthesis-of-a-cationic-doped-ca-24-al-28-o-64-4-4e-composite-via-a-rapid-citrate-sol-gel-method
#19
Karim Khan, Ayesha Khan Tareen, Sayed Elshahat, Ashish Yadav, Usman Khan, Minghui Yang, Luigi Bibbò, Zhengbiao Ouyang
One of the greatest challenges in the enhancement of the electrical properties of conductive mayenite [Ca 24 Al 28 O 64 ] 4+ (4e - ) (hereinafter C12A7:e - ) is the design of a more suitable/simple synthesis strategy that can be employed to obtain the required properties such as excellent stable electrical conductivity, a high electron concentration, outstanding mobility, and an exceptionally large surface area. Therefore, to synthesize C12A7:e - in the metallic state, we proposed a facile, direct synthesis strategy based on an optimized sol-gel combustion method under a nitrogen gas environment using the low-cost precursors Ca(NO 3 ) 2 ·4H 2 O and Al(NO 3 ) 3 ·9H 2 O...
February 16, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29450110/quantitative-analyses-of-the-equilibria-among-dna-complexes-of-a-blue-light-regulated-bzip-module-photozipper
#20
Yoichi Nakatani, Osamu Hisatomi
Aureochrome1 is a blue-light-receptor protein identified in a stramenopile alga, Vaucheria frigida . Photozipper (PZ) is an N-terminally truncated, monomeric, V. frigida aureochrome1 fragment containing a basic leucine zipper (bZIP) domain and a light-oxygen-voltage (LOV)-sensing domain. PZ dimerizes upon photoexcitation and consequently increases its affinity for the target sequence. In the present study, to understand the equilibria among DNA complexes of PZ, DNA binding by PZ and mutational variants was quantitatively investigated by electrophoretic-mobility-shift assay and fluorescence-correlation spectroscopy in the dark and light states...
2018: Biophysics and Physicobiology
keyword
keyword
102431
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"