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https://www.readbyqxmd.com/read/28350697/tritium-3-h-retention-in-mice-administered-as-hto-dto-or-as-3-h-labeled-amino-acids
#1
Nicholas D Priest, Melinda S J Blimkie, Heather Wyatt, Michelle Bugden, Laura A Bannister, Yann Gueguen, Jean-Rene Jourdain, Dmitry Klokov
The objective of this study was to compare the biokinetics of injected H-labeled light (HTO) and heavy (DTO) water in CBA/CaJ mice and to compare the organ distribution and/or body content of H administered by chronic ingestion for 1 mo to C57Bl/6J mice, as either H-labeled water or H-labeled amino acids (glycine, alanine and proline). HTO and DTO were administered to CBA/CaJ mice by single intraperitoneal injection and body retention was determined for up to 384 h post-injection. Tritium-labeled water or H-labeled amino acids were given to C57Bl/6J mice ad libitum for 30 d in drinking water...
May 2017: Health Physics
https://www.readbyqxmd.com/read/28346900/growing-season-variability-in-carbon-dioxide-exchange-of-irrigated-and-rainfed-soybean-in-the-southern-united-states
#2
Pradeep Wagle, Prasanna H Gowda, Saseendran S Anapalli, Krishna N Reddy, Brian K Northup
Measurement of carbon dynamics of soybean (Glycine max L.) ecosystems outside Corn Belt of the United States (U.S.) is lacking. This study examines the seasonal variability of net ecosystem CO2 exchange (NEE) and its components (gross primary production, GPP and ecosystem respiration, ER), and relevant controlling environmental factors between rainfed (El Reno, Oklahoma) and irrigated (Stoneville, Mississippi) soybean fields in the southern U.S. during the 2016 growing season. Grain yield was about 1.6tha(-1) for rainfed soybean and 4...
March 24, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28345964/end-tidal-carbon-dioxide-as-a-prognostic-feature-in-pulmonary-arterial-hypertension
#3
Caitlin E Welch, Evan L Brittain, Alexander L Newman, Ivan M Robbins, Meredith E Pugh, John H Newman, Anna R Hemnes
RATIONALE: Pulmonary arterial hypertension (PAH) is characterized in part by increased dead space ventilation, which can be estimated noninvasively at the bedside by measurement of end-tidal CO2 (ETCO2). OBJECTIVES: Prior work has demonstrated that ETCO2 is lower in PAH than control patients, but whether ETCO2 has prognostic value is unknown. We hypothesized that lower measurements of ETCO2 in patients with PAH correlate with worse long-term outcomes. METHODS: Patients with PAH seen in our referral clinic were prospectively recruited for ETCO2 measurement between September 2009 and February 2010...
March 27, 2017: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/28345959/ventilatory-inefficiency-and-exertional-dyspnea-in-early-chronic-obstructive-pulmonary-disease
#4
J Alberto Neder, Danilo C Berton, Paulo de Tarso Müller, Amany F Elbehairy, Alcides Rocha, Paolo Palange, Denis E O'Donnell
Exertional dyspnea is present across the spectrum of chronic obstructive pulmonary disease (COPD) severity. However, without realizing it themselves, patients may decrease daily physical activity to avoid distressing respiratory sensations. Dyspnea also may be associated with deconditioning. Cardiopulmonary exercise testing can uncover exertional dyspnea and its physiological determinants in patients with preserved or only mildly-reduced FEV1. Dyspnea in mild COPD can largely be explained by increased "wasted" ventilation in the physiological dead space which heightens the drive to breathe and worsens the inspiratory mechanical constraints...
March 27, 2017: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/28345925/metal-insertion-in-a-methylamine-functionalized-zirconium-metal-organic-framework-for-enhanced-carbon-dioxide-capture
#5
A Paulina Gómora-Figueroa, Jarad A Mason, Miguel I Gonzalez, Eric D Bloch, Katie R Meihaus
The reaction of ZrCl4 with 2',3',5',6'-tetramethylamino-p-terphenyl-4,4″-dicarboxylic acid (H2tpdc-4CH2NH2·3HCl) in the presence of NaF affords Zr6O4(OH)2.1F1.9(tpdc-4CH2NH2·3HCl)6 (1), which is a new member of the Zr6O4(OH)4(dicarboxylate linker)12 or UiO-68 family, and exhibits high porosity with BET and Langmuir surface areas of 1910 m(2)/g and 2220 m(2)/g, respectively. Remarkably, fluoride ion incorporation in the zirconium clusters results in increased thermal stability, marking the first example of enhancement in the stability of a UiO framework by this defect-restoration approach...
March 27, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28345631/structure-of-the-cyanuric-acid-hydrolase-trzd-reveals-product-exit-channel
#6
Asim K Bera, Kelly G Aukema, Mikael Elias, Lawrence P Wackett
Cyanuric acid hydrolases are of industrial importance because of their use in aquatic recreational facilities to remove cyanuric acid, a stabilizer for the chlorine. Degradation of excess cyanuric acid is necessary to maintain chlorine disinfection in the waters. Cyanuric acid hydrolase opens the cyanuric acid ring hydrolytically and subsequent decarboxylation produces carbon dioxide and biuret. In the present study, we report the X-ray structure of TrzD, a cyanuric acid hydrolase from Acidovorax citrulli. The crystal structure at 2...
March 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28345106/phenylamine-functionalized-mesoporous-silica-supported-pdag-nanoparticles-a-dual-heterogeneous-catalyst-for-formic-acid-co2-mediated-chemical-hydrogen-delivery-storage
#7
Kohsuke Mori, Shinya Masuda, Hiromasa Tanaka, Kazunari Yoshizawa, Michel Che, Hiromi Yamashita
A PdAg-based nanoparticle catalyst supported on the mesoporous silica material, SBA-15, modified with a weakly basic phenylamine functional group has been developed as a dual heterogeneous catalyst for the H2 delivery and H2 storage reactions mediated by formic acid and carbon dioxide.
March 27, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28343050/photocatalytic-efficiency-of-fe2o3-tio2-for-the-degradation-of-typical-dyes-in-textile-industries-effects-of-calcination-temperature-and-uv-assisted-thermal-synthesis
#8
Mohsen Nasirian, Ciro Fernando Bustillo-Lecompte, Mehrab Mehrvar
The inadequate management practices in industrial textile effluents have a considerable negative impact on the environment and human health due to the indiscriminate release of dyes. Photocatalysis is one of the diverse advance oxidation processes (AOPs) and titanium dioxide (TiO2) is recognized for its high oxidation and reduction power. A composite photocatalyst of Fe2O3/TiO2 is synthesized using different mass ratios of Fe:TiO2 to improve its photoactivity. The composite photocatalyst is calcined at 300-900 °C...
March 23, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28342415/initial-report-on-methane-and-carbon-dioxide-emission-dynamics-from-sub-antarctic-freshwater-ecosystems-a-seasonal-study-of-a-lake-and-a-reservoir
#9
Oscar Gerardo-Nieto, María Soledad Astorga-España, Andrés Mansilla, Frederic Thalasso
The sub-Antarctic Magellanic ecoregion is a part of the world where ecosystems have been understudied and where the CH4 cycling and emissions in lakes has not ever been reported. To fill that knowledge gap, a lake and a reservoir located at 53°S were selected and studied during three campaigns equally distributed over one year. Among the parameters measured were CH4 and CO2 emissions, as well their dissolved concentrations in the water column, which were determined with high spatial resolution. No ebullition was observed and the CH4 flux ranged from 0...
March 22, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28341888/the-respiratory-control-of-carbon-dioxide-in-children-and-adolescents-referred-for-treatment-of-psychogenic-non-epileptic-seizures
#10
Kasia Kozlowska, Reena Rampersad, Catherine Cruz, Ubaid Shah, Catherine Chudleigh, Samantha Soe, Deepak Gill, Stephen Scher, Pascal Carrive
Psychogenic non-epileptic seizures (PNES) are a common problem in paediatric neurology and psychiatry that can best be understood as atypical responses to threat. Threats activate the body for action by mediating increases in arousal, respiration, and motor readiness. In previous studies, a range of cardiac, endocrine, brain-based, attention-bias, and behavioral measures have been used to demonstrate increases in arousal, vigilance, and motor readiness in patients with PNES. The current study uses respiratory measures to assess both the motor readiness of the respiratory system and the respiratory regulation of CO2...
March 24, 2017: European Child & Adolescent Psychiatry
https://www.readbyqxmd.com/read/28341558/biomethane-the-energy-storage-platform-chemical-and-greenhouse-gas-mitigation-target
#11
Zoltán Bagi, Norbert Ács, Tamás Böjti, Balázs Kakuk, Gábor Rákhely, Orsolya Strang, Márk Szuhaj, Roland Wirth, Kornél L Kovács
Results in three areas of anaerobic microbiology in which methane formation and utilization plays central part are reviewed. a.) Bio-methane formation by reduction of carbon dioxide in the power-to-gas process and the various possibilities of improvement of the process is a very intensively studied topic recently. From the numerous potential methods of exploiting methane of biological origin two aspects are discussed in detail. b.) Methane can serve as a platform chemical in various chemical and biochemical synthetic processes...
March 21, 2017: Anaerobe
https://www.readbyqxmd.com/read/28341290/the-cessation-of-breathing-in-the-chicken-embryo-during-cold-hypometabolism
#12
Ryoji Ide, Satoko Tomita Ide, Jacopo P Mortola
The avian embryo toward end-incubation combines gas exchange through the chorioallantoic membrane (CAM) and pulmonary ventilation (V˙E). The main experiments examined breathing activity during cold-hypometabolism. Chicken embryos close to hatching were prepared for simultaneous measurements of oxygen consumption ( [Formula: see text] ) and carbon dioxide production ( [Formula: see text] ; open-flow methodology) and breathing frequency (f; barometric technique). As ambient (Ta) and egg temperature (Tegg) dropped, breathing eventually ceased at ∼18°C, when [Formula: see text] and [Formula: see text] were 22-28% of the normothermic values...
March 21, 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/28341187/persistent-hyperlactatemia-high-central-venous-arterial-carbon-dioxide-to-arterial-venous-oxygen-content-ratio-is-associated-with-poor-outcomes-in-early-resuscitation-of-septic-shock
#13
Juandi Zhou, Jia Song, Shijin Gong, Li Li, Haixiang Zhang, Minjia Wang
OBJECTIVE: Several studies reported Pv-aCO2/Ca-vO2 ratio as a surrogate of VCO2/VO2 to detect global tissue hypoxia. The present study aimed to evaluate the prognostic value of Pv-aCO2/Ca-vO2 ratio combined with lactate levels during the early phases of resuscitation in septic shock. METHODS: A retrospective study was conducted in 144 septic shock patients in a 30-bed mixed ICU. A Pv-aCO2/Ca-vO2 ratio>1.4 was considered abnormal. Patients were classified into four predefined groups according to lactate levels and Pv-aCO2/Ca-vO2 ratio after the first 6h of resuscitation...
March 14, 2017: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28340969/effect-of-different-rates-of-spent-coffee-grounds-scg-on-composting-process-gaseous-emissions-and-quality-of-end-product
#14
Cátia Santos, João Fonseca, Alfredo Aires, João Coutinho, Henrique Trindade
The use of spent coffee grounds (SCG) in composting for organic farming is a viable way of valorising these agro-industrial residues. In the present study, four treatments with different amounts of spent coffee grounds (SCG) were established, namely, C0 (Control), C10, C20 and C40, containing 0, 10, 20 and 40% of SCG (DM), respectively; and their effects on the composting process and the end-product quality characteristics were evaluated. The mixtures were completed with Acacia dealbata L. shoots and wheat straw...
January 2017: Waste Management
https://www.readbyqxmd.com/read/28340433/feasibility-of-carbon-dioxide-sequestration-by-spongiochloris-sp-microalgae-during-petroleum-wastewater-treatment-in-airlift-bioreactor
#15
Abdeldjalil Abid, Faten Saidane, Moktar Hamdi
The aim of this work was to study the ability of using Hydrocabonoclastic native microbial and Spongiochloris sp microalgae in airlift bioreactors couples in order to restore hydrocarbons wastewater and develop the capacity of natural systems to reduce greenhouse effect through maximal control of CO2 gas emission in atmosphere. The kinetic parameters of CO2 gas fixation level and conversion it into biological material by microalgae as the biodegradation process effect in hydrocarbon have been evaluated. The result present that maximum specific growth rate μmax of Spongiochloris sp was (0...
March 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28340292/combined-spiroergometry-and-31-p-mrs-of-human-calf-muscle-during-high-intensity-exercise
#16
K Moll, A Gussew, C Hein, N Stutzig, J R Reichenbach
Simultaneous measurements of pulmonary oxygen consumption (VO2 ), carbon dioxide exhalation (VCO2 ) and phosphorus magnetic resonance spectroscopy ((31) P-MRS) are valuable in physiological studies to evaluate muscle metabolism during specific loads. Therefore, the aim of this study was to adapt a commercially available spirometric device to enable measurements of VO2 and VCO2 whilst simultaneously performing (31) P-MRS at 3 T. Volunteers performed intense plantar flexion of their right calf muscle inside the MR scanner against a pneumatic MR-compatible pedal ergometer...
March 24, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28339039/the-effects-of-air-pollutants-on-the-mortality-rate-of-lung-cancer-and-leukemia
#17
Mansooreh Dehghani, Laila Keshtgar, Mohammad Reza Javaheri, Zahra Derakhshan, Gea Oliveri Conti, Pietro Zuccarello, Margherita Ferrante
World Health Organization classifies air pollution as the first cause of human cancer. The present study investigated impact of air pollutants on the mortality rates of lung cancer and leukemia in Shiraz, one of the largests cities of Iran. This cross‑sectional (longitudinal) study was carried out in Shiraz. Data on six main pollutants, CO, SO2, O3, NO2, PM10 and PM2.5, were collected from Fars Environmental Protection Agency for 3,001 days starting from 1 January, 2005. Also, measures of climatic factors (temperature, humidity, and air pressure) were obtained from Shiraz Meteorological Organization...
March 24, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28338970/woody-plant-ecosystems-under-climate-change-and-air-pollution-response-consistencies-across-zonobiomes
#18
R Matyssek, A R Kozovits, G Wieser, J King, H Rennenberg
Forests store the largest terrestrial pools of carbon (C), helping to stabilize the global climate system, yet are threatened by climate change (CC) and associated air pollution (AP, highlighting ozone (O3) and nitrogen oxides (NOx)). We adopt the perspective that CC-AP drivers and physiological impacts are universal, resulting in consistent stress responses of forest ecosystems across zonobiomes. Evidence supporting this viewpoint is presented from the literature on ecosystem gross/net primary productivity and water cycling...
March 14, 2017: Tree Physiology
https://www.readbyqxmd.com/read/28338317/kinetics-and-mechanism-of-the-oxidation-of-thiourea-dioxide-by-iodine-in-a-slightly-acidic-medium
#19
Li Xu, László Valkai, Alena A Kuznetsova, Sergei V Makarov, Attila K Horváth
The thiourea dioxide (TDO)-iodine reaction was investigated spectrophotometrically monitoring the consumption of total amount of iodine at 468 nm, at T = 25.0 ± 0.1 °C, and at 0.5 M ionic strength in buffered slightly acidic medium. The nitrogen- and carbon-containing products were found to be ammonium ion and dissolved carbon dioxide, respectively, while from sulfur part sulfate ion was exclusively detected, when fresh TDO solution was used. The stoichiometry of the reaction was established as 2I2 + TDO + 4H2O → SO4(2-) + 2NH4(+) + 4I(-) + CO2 + 4H(+) indicating a strict 2:1 stoichiometric ratio...
March 24, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28338279/elemental-boron-for-efficient-carbon-dioxide-reduction-under-light-irradiation
#20
Guigao Liu, Xianguang Meng, Huabin Zhang, Guixia Zhao, Hong Pang, Tao Wang, Peng Li, Tetsuya Kako, Jinhua Ye
The photoreduction of CO2 is attractive for the production of renewable fuels and the mitigation of global warming. Herein, we report an efficient method for CO2 reduction over elemental boron catalysts in the presence of only water and light irradiation through a photothermocatalytic process. Owing to its high solar-light absorption and effective photothermal conversion, the illuminated boron catalyst experiences remarkable self-heating. This process favors CO2 activation and also induces localized boron hydrolysis to in situ produce H2 as an active proton source and electron donor for CO2 reduction as well as boron oxides as promoters of CO2 adsorption...
March 24, 2017: Angewandte Chemie
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