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Oxygen kinetics

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https://www.readbyqxmd.com/read/28637166/comparison-of-the-anaerobic-digestion-at-the-mesophilic-and-thermophilic-temperature-regime-of-organic-wastes-from-the-agribusiness
#1
Daniela Almeida Streitwieser
An overall kinetic power law model has been successfully applied to study the anaerobic digestion of agricultural wastes. In this comparative kinetic study feed composition, organic load rate, residence time and process temperature have been systematically varied in an automated semi-continuous fermentation system to obtain the dependency of the rate of degradation as biogas production on the organic load rate and temperature. The results show that the overall reaction order depend only on the Chemical Oxygen Demand (COD) at values between 3...
June 17, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28636149/photocatalytic-interaction-of-aminophylline-riboflavin-leads-to-ros-mediated-dna-damage-and-cell-death-a-novel-phototherapeutic-mechanism-for-cancer
#2
Saniyya Khan, Imrana Naseem
The accompanied tissue devastation and systemic toxicity of chemotherapy has shifted the quest for having an effective and palliative cancer therapy towards photodynamic therapy (PDT). Riboflavin (Rf), an essential micronutrient is emerging as a potent tool of PDT, due to its excellent photosensitizing properties. It can be used as an efficient adjuvant for various anticancer drugs. The hemolytic and proteolytic effect of photoilluminated aminophylline (Am), a xanthine derivative, and Rf is well documented in literature...
June 21, 2017: IUBMB Life
https://www.readbyqxmd.com/read/28635079/oxygen-vacancy-mediated-photocatalysis-of-biocl-reactivity-selectivity-and-perspective
#3
Hao Li, Jie Li, Zhihui Ai, Falong Jia, Lizhi Zhang
Semiconductor photocatalysis is a trustworthy approach to harvest clean solar light for energy conversions, while state-of-the-art catalytic efficiencies are unsatisfactory because of the finite light response and/or robust charge carriers' recombination. Along with the development of modern material characterization techniques and electronic-structure computations, oxygen vacancies (OVs) on real photocatalysts surface, even in infinitesimal concentration, are found to play a more decisive role in determining the kinetics, energetics and mechanisms of photocatalytic reactions...
June 20, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28634686/respiratory-uptake-and-depuration-kinetics-of-perfluorooctanesulfonate-pfos-in-a-marine-sandworm-species
#4
Takeo Sakurai, Jun Kobayashi, Nozomi Ito, Shigeko Serizawa, Hiroaki Shiraishi, Tohru Yabe, Yuichi Ishii, Noriyuki Suzuki
We determined the respiratory uptake and depuration kinetics of perfluorooctanesulfonate (PFOS) in Perinereis wilsoni, a polychaete sandworm used as a model species to investigate the fate of chemical pollutants in coastal environments. The sandworms were kept in gravel-packed containers, and the water levels were varied cyclically to mimic the tides. We used seawater kept at 17.1°C. A 7-day exposure period was followed by a 9-day depuration period. The dissolved PFOS concentration averaged 28 ng/L during the exposure period...
June 20, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28634386/shape-and-composition-control-of-monodisperse-hybrid-pt-coo-nanocrystals-by-controlling-the-reaction-kinetics-with-additives
#5
Hyunje Woo, Eunji Kim, Jun-Hyuk Kim, Su-Won Yun, Ji Chan Park, Yong-Tae Kim, Kang Hyun Park
Here, we report the effect of Fe(CO)5 additives in the synthesis of branched Pt-CoO nanowires (NWs) and core@shell concave nanocubes (NCs), in a one-pot system. Key to the success of this synthesis is control over the shape of the Pt seeds by controlling the quantity of Fe(CO)5 additive. In the absence of Fe(CO)5, branched Pt-CoO NWs were synthesized through the attachment of small Pt seed particles, followed by the growth of CoO by deposition. On the other hand, Pt@CoO concave NCs were obtained in the presence of Fe(CO)5 because of the stronger adsorption of Co on the Pt (100) surfaces than on the closely packed (111) surfaces...
June 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28634219/early-use-of-n-acetylcysteine-nac-with-nitrate-therapy-in-patients-undergoing-primary-percutaneous-coronary-intervention-for-st-segment-elevation-myocardial-infarction-reduces-myocardial-infarct-size-the-naciam-trial
#6
Sivabaskari Pasupathy, Rosanna Tavella, Suchi Grover, Betty Raman, Nathan E K Procter, Yang T Du, Gnanadevan Mahadavan, Irene Stafford, Tamila Heresztyn, Andrew Holmes, Christopher Zeitz, Margaret Arstall, Joseph B Selvanayagam, John D Horowitz, John F Beltrame
Background -Contemporary ST-elevation myocardial infarction (STEMI) management involves primary percutaneous coronary intervention (PCI) with on-going studies focusing on infarct size reduction utilizing ancillary therapies. N-acetylcysteine (NAC) is an antioxidant with reactive oxygen species scavenging properties that also potentiates the effects of nitroglycerin (NTG) and thus represents a potentially beneficial ancillary therapy in primary PCI. The NACIAM (NACIn Acute Myocardial infarction) trial examined the effects of NAC on infarct size in STEMI patients undergoing PCI...
June 20, 2017: Circulation
https://www.readbyqxmd.com/read/28633823/sono-synthesis-of-solar-light-responsive-s-n-c-tri-doped-tio2-photo-catalyst-under-optimized-conditions-for-degradation-and-mineralization-of-diclofenac
#7
Sara Ramandi, Mohammad H Entezari, Narjes Ghows
C-N-S-tri doped TiO2 anatase phase was synthesized using a facile, effective and novel sonochemical method at low frequency (20kHz) and at room temperature. Titanium butoxide as the titanium precursor and thiourea as the dopant source were used in the synthesis of the photo-catalyst. The effects of important parameters such as thiourea/Ti molar ratio, ultrasound intensity, sonication time and temperature were studied on the synthesis of tri-doped TiO2. The XPS results confirmed the presence of N, S, and C in the photo-catalyst...
September 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28627883/mechanism-of-vanadium-leaching-during-surface-weathering-of-basic-oxygen-furnace-steel-slag-blocks-a-%C3%A2%C2%B5xanes-and-sem-study
#8
Andrew James Hobson, Douglas I Stewart, Andrew William Bray, Robert J G Mortimer, William Matthew Mayes, Michael Rogerson, Ian T Burke
Basic oxygen furnace (BOF) steelmaking slag is enriched in potentially toxic V which may become mobilised in high pH leachate during weathering. BOF slag was weathered under aerated and air-excluded conditions for 6 months prior to SEM/EDS and µXANES analysis to determine V host phases and speciation in both primary and secondary phases. Leached blocks show development of an altered region in which free lime and dicalcium silicate phases were absent and Ca-Si-H was precipitated (CaCO3 was also present under aerated conditions)...
June 19, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28627807/catalytic-oxidation-of-alcohol-to-carboxylic-acid-with-hydrophobic-cobalt-catalyst-in-hydrocarbon-solvent
#9
Song Shi, Meng Liu, Li Zhao, Min Wang, Chen Chen, Jin Gao, Jie Xu
A hydrophobic cobalt catalyst was synthesized and proved to be effective in the alcohol oxidation under the assistance of hydrocarbon solvent with oxygen as the terminal oxidant. A series of catalyst with different water contact angles was applied to investigate the hydrophobic effect. Further insight in to the reaction process was researched by reaction kinetics, isotopic effect, etc. It showed that thehydrocarbon solvent participated in the alcohol oxidation, andwith the aid of the in-situ generated free radicals, the α-C-H bond was smoothly activated and the alcohol was converted to carbonyl compounds...
June 19, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28627127/metal-organic-framework-derived-hybrid-carbon-nanocages-as-a-bifunctional-electrocatalyst-for-oxygen-reduction-and-evolution
#10
Shaohong Liu, Zhiyu Wang, Si Zhou, Fengjiao Yu, Mengzhou Yu, Chang-Yang Chiang, Wuzong Zhou, Jijun Zhao, Jieshan Qiu
The oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are cornerstone reactions for many renewable energy technologies. Developing cheap yet durable substitutes of precious-metal catalysts, especially the bifunctional electrocatalysts with high activity for both ORR and OER reactions and their streamlined coupling process, are highly desirable to reduce the processing cost and complexity of renewable energy systems. Here, a facile strategy is reported for synthesizing double-shelled hybrid nanocages with outer shells of Co-N-doped graphitic carbon (Co-NGC) and inner shells of N-doped microporous carbon (NC) by templating against core-shell metal-organic frameworks...
June 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28627041/prior-exercise-speeds-pulmonary-oxygen-uptake-kinetics-and-increases-critical-power-during-supine-but-not-upright-cycling
#11
Richie P Goulding, Denise M Roche, Simon Marwood
Critical power (CP) is a fundamental parameter defining high-intensity exercise tolerance and is related to the time constant of phase II pulmonary oxygen uptake kinetics (τV̇O2 ). To test the hypothesis that this relationship is causal we determined the impact of prior exercise ("priming") on CP and τV̇O2 in the upright and supine positions. 17 healthy men were assigned to either upright or supine exercise groups, whereby CP, τV̇O2 and muscle deoxyhaemoglobin kinetics (τ[HHb] ) were determined via constant-power tests to exhaustion at four work-rates with (primed) and without (control) priming exercise at ∼31%Δ...
June 19, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28625766/amine-oxidation-by-d-arginine-dehydrogenase-in-pseudomonas-aeruginosa
#12
REVIEW
Daniel Ouedraogo, Jacob Ball, Archana Iyer, Renata A G Reis, Maria Vodovoz, Giovanni Gadda
d-Arginine dehydrogenase from Pseudomonas aeruginosa (PaDADH) is a flavin-dependent oxidoreductase, which is part of a novel two-enzyme racemization system that functions to convert d-arginine to l-arginine. PaDADH contains a noncovalently linked FAD that shows the highest activity with d-arginine. The enzyme exhibits broad substrate specificity towards d-amino acids, particularly with cationic and hydrophobic d-amino acids. Biochemical studies have established the structure and the mechanistic properties of the enzyme...
June 15, 2017: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28624444/distribution-lipid-bilayer-affinity-and-kinetics-of-the-metabolic-effects-of-dinoseb-in-the-liver
#13
Gabriela Bueno Franco Salla, Lívia Bracht, Anacharis Babeto de Sá-Nakanishi, Angela Valderrama Parizotto, Fabrício Bracht, Rosane Marina Peralta, Adelar Bracht
Dinoseb is a highly toxic pesticide of the dinitrophenol group. Its use has been restricted, but it can still be found in soils and waters in addition to being a component of related pesticides that, after ingestion by humans or animals, can originate the compound by enzymatic hydrolysis. As most dinitrophenols, dinoseb uncouples oxidative phosphorylation. In this study, distribution, lipid bilayer affinity and kinetics of the metabolic effects of dinoseb were investigated, using mainly the isolated perfused rat liver, but also isolated mitochondria and molecular dynamics simulations...
June 14, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28623023/pyrolysis-reaction-models-of-waste-tires-application-of-master-plots-method-for-energy-conversion-via-devolatilization
#14
Dilan Irmak Aslan, Prakash Parthasarathy, Jillian L Goldfarb, Selim Ceylan
Land applied disposal of waste tires has far-reaching environmental, economic, and human health consequences. Pyrolysis represents a potential waste management solution, whereby the solid carbonaceous residue is heated in the absence of oxygen to produce liquid and gaseous fuels, and a solid char. The design of an efficient conversion unit requires information on the reaction kinetics of pyrolysis. This work is the first to probe the appropriate reaction model of waste tire pyrolysis. The average activation energy of pyrolysis was determined via iso-conversional methods over a mass fraction conversion range between 0...
June 13, 2017: Waste Management
https://www.readbyqxmd.com/read/28621134/surfactant-and-binder-free-hierarchical-platinum-nanoarrays-directly-grown-onto-a-carbon-felt-electrode-for-efficient-electrocatalysis
#15
Widya Ernayati Kosimaningrum, Thi-Xuan-Huong Le, Yaovi Holade, Mikhael Bechelany, Sophie Tingry, Buchari Buchari, Indra Noviandri, Christophe Innocent, Marc Cretin
The future of fuel cells that convert the chemical energy to electricity relies mostly on the efficiency of oxygen reduction reaction (ORR) due to its sluggish kinetics. By effectively bypassing the use of organic surfactants, post-synthesis steps for the immobilization onto electrodes, the catalytic inks preparation using binders, and the common problem of nanoparticles detachment from supports involved in traditional methodologies, we demonstrate a versatile electrodeposition method for growing anisotropic microstructures directly onto a three-dimensional (3D) carbon felt electrode, using platinum nanoparticles as elementary building blocks...
June 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28620055/the-effects-of-rsr13-on-microvascular-po2-kinetics-and-muscle-contractile-performance-in-the-rat-arterial-ligation-model-of-peripheral-arterial-disease
#16
Aiko Watanabe, David C Poole, Yutaka Kano
Exercise intolerance and claudication are symptomatic of peripheral arterial disease. There is a close relationship between muscle O2 delivery, microvascular oxygen partial pressure (PmvO2) and contractile performance. We therefore hypothesized that a reduction of hemoglobin-oxygen affinity via RSR13 would maintain a higher PmvO2 and enhance blood-muscle O2 transport and contractile function. In male Wistar rats we created hindlimb ischemia via right side iliac artery ligation (AL). The contralateral (left) muscle served as control (CONT)...
June 15, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28619032/the-role-of-intracellular-trafficking-of-cdse-zns-qds-on-their-consequent-toxicity-profile
#17
Bella B Manshian, Thomas F Martens, Karsten Kantner, Kevin Braeckmans, Stefaan C De Smedt, Jo Demeester, Gareth J S Jenkins, Wolfgang J Parak, Beatriz Pelaz, Shareen H Doak, Uwe Himmelreich, Stefaan J Soenen
BACKGROUND: Nanoparticle interactions with cellular membranes and the kinetics of their transport and localization are important determinants of their functionality and their biological consequences. Understanding these phenomena is fundamental for the translation of such NPs from in vitro to in vivo systems for bioimaging and medical applications. Two CdSe/ZnS quantum dots (QD) with differing surface functionality (NH2 or COOH moieties) were used here for investigating the intracellular uptake and transport kinetics of these QDs...
June 15, 2017: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/28618363/simultaneous-sorption-and-catalytic-oxidation-of-trivalent-antimony-by-canna-indica-derived-biochars
#18
Xiaoqiang Cui, Qijun Ni, Qiang Lin, Kiran Yasmin Khan, Tingqiang Li, Muhammad Bilal Khan, Zhenli He, Xiaoe Yang
The simultaneous sorption and oxidation of Sb(III) on biochars were investigated using batch experiments. The biochars were derived from Canna indica at different pyrolysis temperatures (300-600 °C, referred as CIB300-CIB600), and characterized by FTIR, BET, XRD, SEM-EDS, EPR and Boehm titration. The Sb(III) sorption data could be well fitted by both the Langmuir and Freundlich models, and the pseudo-second order model is best for describing the kinetic data. The maximum Sb(III) sorption capacity of CIB300 was 16...
June 12, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28618080/electrocatalytic-mechanism-involving-michaelis-menten-kinetics-at-the-preparative-scale-theory-and-applicability-to-photocurrents-from-photosynthetic-algae-suspension-with-quinones
#19
Guillaume Longatte, Manon Guille-Collignon, Frédéric Lemaître
In the past years, many strategies were implemented to take benefits from oxygenic photosynthesis to harvest photosynthetic electrons and produce a significant photocurrent. Therefore, electrochemical tools were considered and globally relied on the electron transfer(s) between the photosynthetic chain and a collecting electrode. In this context, we recently reported the implementation of an electrochemical set-up at the preparative scale to produce photocurrents from a Chlamydomonas reinhardtii algae suspension with an appropriate mediator (2,6-DCBQ) and a carbon gauze as the working electrode...
June 15, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28614603/light-switchable-oxygen-vacancies-in-ultrafine-bi5-o7-br-nanotubes-for-boosting-solar-driven-nitrogen-fixation-in-pure-water
#20
Shengyao Wang, Xiao Hai, Xing Ding, Kun Chang, Yonggang Xiang, Xianguang Meng, Zixin Yang, Hao Chen, Jinhua Ye
Solar-driven reduction of dinitrogen (N2 ) to ammonia (NH3 ) is severely hampered by the kinetically complex and energetically challenging multielectron reaction. Oxygen vacancies (OVs) with abundant localized electrons on the surface of bismuth oxybromide-based semiconductors are demonstrated to have the ability to capture and activate N2 , providing an alternative pathway to overcome such limitations. However, bismuth oxybromide materials are susceptible to photocorrosion, and the surface OVs are easily oxidized and therefore lose their activities...
June 14, 2017: Advanced Materials
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