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Oxygen uptake kinetics

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https://www.readbyqxmd.com/read/29210688/the-importance-of-surface-functional-groups-in-the-adsorption-of-copper-onto-walnut-shell-derived-activated-carbon
#1
Ruzhen Xie, Yan Jin, Yao Chen, Wenju Jiang
In this study, activated carbon (AC) was prepared from walnut shell using chemical activation. The surface chemistry of the prepared AC was modified by introducing or blocking certain functional groups, and the role of the different functional groups involved in the copper uptake was investigated. The structural and chemical heterogeneity of the produced carbons are characterized by Fourier transform infrared spectrometry, X-ray photoelectron spectroscopy, Boehm titration method and N2/77 K adsorption isotherm analysis...
December 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29182413/energetic-profile-of-the-basketball-exercise-simulation-test-in-junior-elite-players
#2
Richard Latzel, Olaf Hoos, Sebastian Stier, Sebastian Kaufmann, Volker Fresz, Dominik Reim, Ralph Beneke
PURPOSE: To analyze the energetic profile of the basketball exercise simulation test (BEST). METHODS: 10 male elite junior basketball players (age: 15.5±0.6yrs, height: 180±9cm, body mass: 66.1±11.2kg) performed a modified BEST (20 circuits consisting of jumping, sprinting, jogging, shuffling, and short breaks) simulating professional basketball game play. Circuit time, sprint time, sprint decrement, oxygen uptake (VO2), heart rate (HR), and blood lactate concentration (BLC) were obtained...
November 28, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29161578/probabilistic-pharmacokinetic-models-of-decompression-sickness-in-humans-part-2-coupled-perfusion-diffusion-models
#3
F Gregory Murphy, Ethan A Hada, David J Doolette, Laurens E Howle
Decompression sickness (DCS) can be experienced following a reduction in ambient pressure; such as that associated with diving or ascent to high altitudes. DCS is believed to result when supersaturated inert gas dissolved in biological tissues exits solution and forms bubbles. Models to predict the probability of DCS are typically based on nitrogen and/or helium gas uptake and washout in several theoretical tissues, each represented by a single perfusion-limited compartment. It has been previously shown that coupled perfusion-diffusion compartments are better descriptors than solely perfusion-based models of nitrogen and helium uptake and elimination kinetics observed in the brain and skeletal muscle of sheep...
November 15, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/29157149/stabilized-landfill-leachate-treatment-using-guadua-amplexifolia-bamboo-as-source-of-activated-carbon-kinetics-study
#4
Bianka G Salas-Enríquez, Aidé M Torres-Huerta, Eloy Conde-Barajas, Miguel A Domínguez-Crespo, María L X Negrete-Rodríguez, Héctor J Dorantes-Rosales, Ana B López-Oyama
In the present study, the characteristics of leachate generated from dumpsite called "Zapote" located in southern region of Tamaulipas, Mexico were evaluated. The adsorption of non-biodegradable organic matter measured as chemical oxygen demand (COD), color and heavy metals from leachate on activated carbon prepared in acid media from Guadua amplexifolia bamboo has been studied. In addition, the computation of kinetic parameters during the adsorption process as well as the most probable mechanisms was determined...
November 20, 2017: Environmental Technology
https://www.readbyqxmd.com/read/29154138/preparation-of-biochar-from-enteromorpha-prolifera-and-its-use-for-the-removal-of-polycyclic-aromatic-hydrocarbons-pahs-from-aqueous-solution
#5
Kaili Qiao, Weijun Tian, Jie Bai, Jie Dong, Jing Zhao, Xiaoxi Gong, Shuhui Liu
EP-biochar was produced from Enteromorpha prolifera (EP) at temperatures of 200-600°C under limited-oxygen conditions and then activated using HCl and HF. To optimize the sorption of pyrene (PYR) and benzo[a]pyrene (BaP), the effect of the pyrolysis temperature was studied, and the results showed that EP-biochar produced at 500°C gave the highest removal efficiency. The physiochemical properties of EP-biochar pyrolyzed at 500°C were characterized. The examination indicated that the surface area of EP-biochar was 205...
November 15, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29140137/v%C3%AC-o2-and-muscle-deoxygenation-kinetics-during-skating-comparison-between-slide-board-and-treadmill-skating
#6
Tatiane Piucco, Rogério Soares, Fernando Diefenthaeler, Guillaume Millet, Juan Murias
PURPOSE: this study aimed to compare the oxygen uptake (V̇O2) kinetics during skating on a treadmill and skating on a slide board and discuss potential mechanisms that might control the V̇O2 kinetics responses during skating. METHODS: breath-by-breath pulmonary V̇O2 and near-infrared spectroscopy-derived muscle deoxygenation ([HHbMb]) were monitored continuously in 12 well-trained young long track speed skaters. On-transient V̇O2 and [HHbMb] responses to skating on a treadmill and skating on a slide board at 80% of the estimated gas exchange threshold were fitted as mono-exponential function...
November 15, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29139577/copper-uptake-patterns-of-bioaccumulation-and-effects-in-glochidia-larvae-of-the-freshwater-mussel-lampsilis-cardium
#7
Marianna Basso Jorge, Adalto Bianchini, Chris M Wood, Patricia L Gillis
The early life stages of freshwater mussels are particularly sensitive to Cu contamination. We measured the acute toxicity, bioaccumulation and sublethal effects of Cu in glochidia. Additionally, we used radiolabeled Cu ((64) Cu) to examine the time-dependent kinetics of uptake over 24 h. (64) Cu uptake by live and dead glochidia exposed to 0.11 μmol/L exhibited similar hyperbolic patterns over the first 40 min, indicating an adsorptive phase independent of larval metabolism. Thereafter, uptake was linear with time, with a 10-fold lower bioaccumulation rate in live than in dead animals, representing a close to steady state of Cu regulation...
November 15, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/29119418/low-level-laser-therapy-improves-the-vo2-kinetics-in-competitive-cyclists
#8
Fábio J Lanferdini, Renata L Krüger, Bruno M Baroni, Caetano Lazzari, Pedro Figueiredo, Alvaro Reischak-Oliveira, Marco A Vaz
Some evidence supports that low-level laser therapy (LLLT) reduces neuromuscular fatigue, so incrementing sports performance. A previous randomized controlled trial of our group showed increased exercise tolerance in male competitive cyclists treated with three different LLLT doses (3, 6, and 9 J/diode; or 135, 270, and 405 J/thigh) before time-to-exhaustion cycling tests. Now, the present study was designed to evaluate the effects of these LLLT doses on the VO2 kinetics of athletes during cycling tests. Twenty male competitive cyclists (29 years) participated in a crossover, randomized, double-blind, and placebo-controlled trial...
November 9, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/29117249/multimodel-inference-applied-to-oxygen-recovery-kinetics-after-6-min-walk-tests-in-patients-with-chronic-obstructive-pulmonary-disease
#9
Florent Baty, Christian Ritz, Signe Marie Jensen, Lukas Kern, Michael Tamm, Martin Hugo Brutsche
6-min walk tests (6MWT) are routinely performed in patients with chronic obstructive pulmonary disease (COPD). Oxygen uptake ([Formula: see text]) kinetics during 6MWT can be modeled and derived parameters provide indicators of patients' exercise capacity. Post-exercise [Formula: see text] recovery also provides important parameters of patients' fitness which has not been extensively investigated in COPD. Several nonlinear regression models with different underlying biological assumptions may be suitable for describing recovery kinetics...
2017: PloS One
https://www.readbyqxmd.com/read/29091934/effects-of-hyperoxia-on-18f-fluoro-misonidazole-brain-uptake-and-tissue-oxygen-tension-following-middle-cerebral-artery-occlusion-in-rodents-pilot-studies
#10
Tim D Fryer, Sohail Ejaz, Ulf Jensen-Kondering, David J Williamson, Sergey Sitnikov, Stephen J Sawiak, Franklin I Aigbirhio, Young T Hong, Jean-Claude Baron
PURPOSE: Mapping brain hypoxia is a major goal for stroke diagnosis, pathophysiology and treatment monitoring. 18F-fluoro-misonidazole (FMISO) positron emission tomography (PET) is the gold standard hypoxia imaging method. Normobaric hyperoxia (NBO) is a promising therapy in acute stroke. In this pilot study, we tested the straightforward hypothesis that NBO would markedly reduce FMISO uptake in ischemic brain in Wistar and spontaneously hypertensive rats (SHRs), two rat strains with distinct vulnerability to brain ischemia, mimicking clinical heterogeneity...
2017: PloS One
https://www.readbyqxmd.com/read/29074573/reply-to-francescato-et-al-interpreting-the-averaging-methods-to-estimate-oxygen-uptake-kinetics-parameters
#11
Alan P Benson, T Scott Bowen, Carrie Ferguson, Scott R Murgatroyd, Harry B Rossiter
No abstract text is available yet for this article.
October 1, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29055837/removal-of-the-pesticide-tebuconazole-in-constructed-wetlands-design-comparison-influencing-factors-and-modelling
#12
Tao Lyu, Liang Zhang, Xiao Xu, Carlos A Arias, Hans Brix, Pedro N Carvalho
Constructed wetlands (CWs) are a promising technology to treat pesticide contaminated water, but its implementation is impeded by lack of data to optimize designs and operating factors. Unsaturated and saturated CW designs were used to compare the removal of triazole pesticide, tebuconazole, in unplanted mesocosms and mesocosms planted with five different plant species: Typha latifolia, Phragmites australis, Iris pseudacorus, Juncus effusus and Berula erecta. Tebuconazole removal efficiencies were significantly higher in unsaturated CWs than saturated CWs, showing for the first time the potential of unsaturated CWs to treat tebuconazole contaminated water...
October 19, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29052015/stoichiometry-and-kinetics-of-single-and-mixed-substrate-uptake-in-aspergillus-niger
#13
Francisca Lameiras, Cor Ras, Angela Ten Pierick, Joseph J Heijnen, Walter M van Gulik
In its natural environment, the filamentous fungus Aspergillus niger grows on decaying fruits and plant material, thereby enzymatically degrading the lignocellulosic constituents (lignin, cellulose, hemicellulose, and pectin) into a mixture of mono- and oligosaccharides. To investigate the kinetics and stoichiometry of growth of this fungus on lignocellulosic sugars, we carried out batch cultivations on six representative monosaccharides (glucose, xylose, mannose, rhamnose, arabinose, and galacturonic acid) and a mixture of these...
October 19, 2017: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/29024783/oxygen-uptake-kinetics-following-six-weeks-of-interval-and-continuous-endurance-exercise-training-an-explorative-pilot-study
#14
U Drescher, T Schefter, J Koschate, T Schiffer, K Brixius, S Schneider, U Hoffmann
PURPOSE: The aim of the study was to compare the responses of pulmonary (V˙O2pulm) and muscle (V˙O2musc) oxygen uptake kinetics before (PRE) and after (POST) six weeks of endurance exercise training. METHODS: Nine untrained individuals performed pseudo-random binary sequences work rate changes between 30W and 80W at PRE and POST training intervention. Heart rate (HR) and V˙O2pulm were measured beat-to-beat and breath-by-breath, respectively. V˙O2musc was estimated applying the approach of Hoffmann et al...
October 9, 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/29018361/new-methods-for-processing-and-quantifying-vo2-kinetics-to-steady-state-vo2-onset-kinetics
#15
Craig R McNulty, Robert A Robergs
Current methods of oxygen uptake (VO2) kinetics data handling may be too simplistic for the complex physiology involved in the underlying physiological processes. Therefore, the aim of this study was to quantify the VO2 kinetics to steady state across the full range of sub-ventilatory threshold work rates, with a particular focus on the VO2 onset kinetics. Ten healthy, moderately trained males participated in five bouts of cycling. Each bout involved 10 min at a percentage of the subject's ventilation threshold (30, 45, 60, 75, 90%) from unloaded cycling...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28990789/singlet-oxygen-production-and-biological-activity-of-hexanuclear-chalcocyanide-rhenium-cluster-complexes-re6q8-cn-6-4-q-s-se-te
#16
Anastasiya O Solovieva, Kaplan Kirakci, Anton A Ivanov, Pavel Kubát, Tatiana N Pozmogova, Svetlana M Miroshnichenko, Elena V Vorontsova, Anton V Chechushkov, Kristina E Trifonova, Maria S Fufaeva, Evgeniy I Kretov, Yuri V Mironov, Alexander F Poveshchenko, Kamil Lang, Michael A Shestopalov
Octahedral rhenium cluster complexes have recently emerged as relevant building blocks for the design of singlet oxygen photosensitizing materials toward biological applications such as blue-light photodynamic therapy. However, their singlet oxygen generation ability as well as biological properties have been studied only superficially. Herein we investigate in detail the singlet oxygen photogeneration, dark and photoinduced cytotoxicity, cellular uptake kinetics, cellular localization and in vitro photoinduced oxidative stress, and photodynamic cytotoxicity of the series of octahedral rhenium cluster complexes [{Re6Q8}(CN)6](4-), where Q = S, Se, Te...
November 6, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28961494/modeling-of-biotic-and-abiotic-processes-affecting-phosphate-oxygen-isotope-ratios-in-a-mineral-water-biota-system
#17
Deb P Jaisi, Yue Hou, Lisa M Stout, Arash Massoudieh
Abiotic and biotic reactions operate side by side in the cycling of phosphorus (P) in the environment, but the relative roles of these two reactions vary both spatially and temporally. In biotic reactions, the uptake and release of P are catalyzed by enzymes and thus change phosphate oxygen isotope ratios, while in abiotic reactions, the absence of hydrolysis-condensation reactions results in no apparent changes in isotope composition, except short-term kinetic isotope effect due solely to preferential ion exchange...
December 1, 2017: Water Research
https://www.readbyqxmd.com/read/28940557/skeletal-muscle-protein-accretion-rates-and-hindlimb-growth-are-reduced-in-late-gestation-intrauterine-growth-restricted-fetal-sheep
#18
Paul J Rozance, Laura Zastoupil, Stephanie R Wesolowski, David A Goldstrohm, Brittany Strahan, Melanie Cree-Green, Melinda Sheffield-Moore, Giacomo Meschia, William W Hay, Randall B Wilkening, Laura D Brown
KEY POINTS: Adults who were affected by intrauterine growth restriction (IUGR) suffer from reductions in muscle mass, which may contribute to insulin resistance and the development of diabetes. We demonstrate slower hindlimb linear growth and muscle protein synthesis rates that match the reduced hindlimb blood flow and oxygen consumption rates in IUGR fetal sheep. These adaptations resulted in hindlimb blood flow rates in IUGR that were similar to control fetuses on a weight-specific basis...
September 22, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28925377/applied-upper-airway-resistance-instantly-affects-breath-components-a-unique-insight-into-pulmonary-medicine
#19
Pritam Sukul, Jochen Schubert, Svend Kamysek, Phillip Trefz, Wolfram Miekisch
Respiratory parameters such as flow or rate have complex effects onto exhalation of volatile substances and can hamper clinical interpretation of breath biomarkers. We investigated effects of progressively applied upper-airway resistances onto exhalation of volatile organic compounds (VOCs) in healthy humans. We performed real-time mass-spectrometric determination of breath volatiles in 50 subjects with parallel non-invasive hemodynamic monitoring, breath-resolved spirometry and capnometry during controlled tidal breathing (12 breaths/min)...
September 19, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28919863/oxygen-uptake-kinetics-is-slower-in-swimming-than-arm-cranking-and-cycling-during-heavy-intensity
#20
Ana Sousa, Fabio Borrani, Ferran A Rodríguez, Grégoire P Millet
Oxygen uptake ([Formula: see text]) kinetics has been reported to be influenced by the activity mode. However, only few studies have compared [Formula: see text]O2 kinetics between activities in the same subjects in which they were equally trained. Therefore, this study compared the [Formula: see text]O2 kinetics response to swimming, arm cranking, and cycling within the same group of subjects within the heavy exercise intensity domain. Ten trained male triathletes (age 23.2 ± 4.5 years; height 180.8 ± 8...
2017: Frontiers in Physiology
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