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https://www.readbyqxmd.com/read/28732305/association-between-gaseous-air-pollutants-and-inflammatory-hemostatic-and-lipid-markers-in-a-cohort-of-midlife-women
#1
Xiangmei May Wu, Rupa Basu, Brian Malig, Rachel Broadwin, Keita Ebisu, Ellen B Gold, Lihong Qi, Carol Derby, Rochelle S Green
BACKGROUND: Exposures to ambient gaseous pollutants have been linked to cardiovascular diseases (CVDs), but the biological mechanisms remain uncertain. OBJECTIVES: This study examined the changes in CVD marker levels resulting from elevated exposure to ambient gaseous pollutants in midlife women. METHODS: Annual repeated measurements of several inflammatory, hemostatic and lipid makers were obtained from 2306 midlife women enrolled in the longitudinal Study of Women's Health Across the Nation (SWAN) between 1999 and 2004...
July 18, 2017: Environment International
https://www.readbyqxmd.com/read/28715112/effects-of-free-air-carbon-dioxide-enrichment-face-on-nitrogen-assimilation-and-growth-of-winter-wheat-under-nitrate-and-ammonium-fertilization
#2
Markus Dier, Rieke Meinen, Martin Erbs, Lena Kollhorst, Christin-Kirsty Baillie, David Kaufholdt, Martin Kücke, Hans-Joachim Weigel, Christian Zörb, Robert Hänsch, Remy Manderscheid
A two year Free Air CO2 Enrichment (FACE) experiment was conducted with winter wheat. It was investigated whether elevated atmospheric CO2 concentrations (e[CO2 ]) inhibit nitrate assimilation and whether better growth and nitrogen acquisition under e[CO2 ] can be achieved with an ammonium based fertilization as it was observed in hydroponic culture with wheat. Under e[CO2 ] a decrease of nitrate assimilation has been discussed as the cause for observed declines in protein concentration in C3 cereals. Wheat was grown under ambient [CO2 ] and e[CO2 ] (600 ppm) with three levels (deficiency, optimal and excessive) of nitrate based fertilization (calcium ammonium nitrate; CAN) or with optimal ammonium based fertilization...
July 17, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28708460/tolerance-to-hypercarbia-is-repeatable-and-related-to-a-component-of-the-metabolic-phenotype-in-a-freshwater-fish
#3
Caleb T Hasler, Ian A Bouyoucos, Cory D Suski
Freshwater fish may be exposed to high levels of carbon dioxide (CO2) because of several actions, including anesthesia and high levels of aquatic respiration and potentially as the result of using high-CO2 plumes as a barrier to the movements of invasive fishes. Metabolic phenotype can potentially drive how freshwater fish respond to high CO2. We therefore quantified how tolerance (measured using time to equilibrium loss [ELT]) was driven by metabolic phenotype in a cosmopolitan freshwater fish species, Micropterus salmoides...
September 2017: Physiological and Biochemical Zoology: PBZ
https://www.readbyqxmd.com/read/28707996/effect-of-the-degree-of-head-elevation-on-the-incidence-and-severity-of-venous-air-embolism-in-cranial-neurosurgical-procedures-with-patients-in-the-semisitting-position
#4
Hatice Türe, M Volkan Harput, Nural Bekiroğlu, Özgül Keskin, Özge Köner, Uğur Türe
OBJECTIVE The semisitting position of a patient confers numerous advantages in various neurosurgical procedures, but venous air embolism is one of the associated complications of this position. To date, no prospective studies of the relationship between the degree of head elevation and the rate and severity of venous air embolism for patients undergoing a procedure in this position have been performed. In this study, the authors compared changes in the severity of venous air embolism according to the degree of head elevation (30° or 45°) in patients undergoing an elective cranial neurosurgical procedure in the semisitting position...
July 14, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28694487/evidence-for-rapid-weathering-response-to-climatic-warming-during-the-toarcian-oceanic-anoxic-event
#5
Theodore R Them, Benjamin C Gill, David Selby, Darren R Gröcke, Richard M Friedman, Jeremy D Owens
Chemical weathering consumes atmospheric carbon dioxide through the breakdown of silicate minerals and is thought to stabilize Earth's long-term climate. However, the potential influence of silicate weathering on atmospheric pCO2 levels on geologically short timescales (10(3)-10(5) years) remains poorly constrained. Here we focus on the record of a transient interval of severe climatic warming across the Toarcian Oceanic Anoxic Event or T-OAE from an open ocean sedimentary succession from western North America...
July 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28684156/virus-incidence-in-wheat-increases-under-elevated-co2-a-4-year-study-of-yellow-dwarf-viruses-from-a-free-air-carbon-dioxide-facility
#6
Piotr Trębicki, Narelle Nancarrow, Nilsa A Bosque-Pérez, Brendan Rodoni, Mohammad Aftab, Angela Freeman, Alan Yen, Glenn Fitzgerald
The complexities behind the mechanisms associated with virus-host-vector interactions of vector-transmitted viruses, and their consequences for disease development need to be understood to reduce virus spread and disease severity. Climate has a substantial effect on viruses, vectors, host plants and their interactions. Increased atmospheric carbon dioxide (CO2) is predicted to impact the interactions between them. This study, conducted under ambient and elevated CO2 (550μmolmol(-1)), in the Australian Grains Free Air Carbon Enrichment facility reports on natural yellow dwarf virus incidence on wheat (including Barley/Cereal yellow dwarf viruses (B/CYDV))...
July 3, 2017: Virus Research
https://www.readbyqxmd.com/read/28667347/clinical-analysis-of-diabetic-combined-pulmonary-mucormycosis
#7
Yu-Hong Li, Peng Sun, Jian-Chao Guo
OBJECTIVE: To improve the understanding of diabetic combined pulmonary mucormycosis. METHODS AND RESULTS: The clinical data of twelve patients diagnosed as diabetic combined pulmonary mucormycosis were analyzed by the clinical manifestations, imaging features, diagnosis, treatment and prognosis of this disease. Patients from January 1999 to June 2015 in our hospital had poor blood glucose control and varying degrees of diabetic chronic complications with an on average of diabetes 8...
June 30, 2017: Mycopathologia
https://www.readbyqxmd.com/read/28666176/nitrous-oxide-methane-and-carbon-dioxide-patterns-and-dynamics-from-an-experimental-pig-mass-grave
#8
M Dalva, T R Moore, M Kalacska, G Leblanc
The objective of the three-year study was to examine spatial and temporal patterns of fluxes and soil pore air concentrations of methane (CH4), carbon dioxide (CO2) and nitrous oxide (N2O) from an experimental mass grave located in a temperate environment. The mass grave (5×10m) contained twenty pig carcasses at a depth of approximately 1m was compared to a plot of the same dimensions containing only disturbed soil, as well as an undisturbed plot. Soil pore air CH4 concentrations were sub-ambient (<1.8ppm) except at 75 and 100cm depths at the mass grave in years 1 and 2 but decreased in year 3...
June 16, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28654331/effects-of-temperature-and-pco2-on-population-regulation-of-symbiodinium-spp-in-a-tropical-reef-coral
#9
Garen Baghdasarian, Andrew Osberg, Danielle Mihora, Hollie Putnam, Ruth D Gates, Peter J Edmunds
This study tested the bleaching response of the Pacific coral Seriatopora caliendrum to short-term exposure to high temperature and elevated partial pressure of carbon dioxide (pCO2). Juvenile colonies collected from Nanwan Bay, Taiwan, were used in a factorial experimental design in which 2 temperatures (∼27.6 °C and ∼30.4 °C) and 2 pCO2 values (∼47.2 Pa and ∼90.7 Pa) were crossed to evaluate, over 12 days, the effects on the densities and physiology of the symbiotic dinoflagellates (Symbiodinium) in the corals...
April 2017: Biological Bulletin
https://www.readbyqxmd.com/read/28654035/measurement-of-the-rheology-of-crude-oil-in-equilibrium-with-co2-at-reservoir-conditions
#10
Ruien Hu, John Crawshaw
A rheometer system to measure the rheology of crude oil in equilibrium with carbon dioxide (CO2) at high temperatures and pressures is described. The system comprises a high-pressure rheometer which is connected to a circulation loop. The rheometer has a rotational flow-through measurement cell with two alternative geometries: coaxial cylinder and double gap. The circulation loop contains a mixer, to bring the crude oil sample into equilibrium with CO2, and a gear pump that transports the mixture from the mixer to the rheometer and recycles it back to the mixer...
June 6, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28644397/relationship-between-remote-sensing-data-plant-biomass-and-soil-nitrogen-dynamics-in-intensively-managed-grasslands-under-controlled-conditions
#11
Christoph Knoblauch, Conor Watson, Clara Berendonk, Rolf Becker, Nicole Wrage-Mönnig, Florian Wichern
The sustainable use of grasslands in intensive farming systems aims to optimize nitrogen (N) inputs to increase crop yields and decrease harmful losses to the environment at the same time. To achieve this, simple optical sensors may provide a non-destructive, time- and cost-effective tool for estimating plant biomass in the field, considering spatial and temporal variability. However, the plant growth and related N uptake is affected by the available N in the soil, and therefore, N mineralization and N losses...
June 23, 2017: Sensors
https://www.readbyqxmd.com/read/28642785/potassium-starvation-limits-soybean-growth-more-than-the-photosynthetic-processes-across-co2-levels
#12
Shardendu K Singh, Vangimalla R Reddy
Elevated carbon dioxide (eCO2) often enhances plant photosynthesis, growth, and productivity. However, under nutrient-limited conditions the beneficial effects of high CO2 are often diminished. To evaluate the combined effects of potassium (K) deficiency and eCO2 on soybean photosynthesis, growth, biomass partitioning, and yields, plants were grown under controlled environment conditions with an adequate (control, 5.0 mM) and two deficient (0.50 and 0.02 mM) levels of K under ambient CO2 (aCO2; 400 μmol mol(-1)) and eCO2 (800 μmol mol(-1))...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28639043/ultrasonographic-optic-nerve-sheath-diameter-for-predicting-elevated-intracranial-pressure-during-laparoscopic-surgery-a-systematic-review-and-meta-analysis
#13
Eun Jung Kim, Bon-Nyeo Koo, Seung Ho Choi, Kyoungun Park, Min-Soo Kim
BACKGROUND: Laparoscopic surgery involves the creation of a carbon dioxide (CO2) pneumoperitoneum to facilitate a clear surgical view, which may result in an elevated intracranial pressure (ICP). Depending on the surgical area, steep Trendelenburg positioning may be used as well, further increasing the ICP. The objective of this study was to assess the effects of laparoscopic surgery on changes in ICP assessed by ultrasonographic measurement of optic nerve sheath diameter (ONSD), which is a generally accepted simple, reliable, and non-invasive ICP measurement technique...
June 21, 2017: Surgical Endoscopy
https://www.readbyqxmd.com/read/28630580/the-effect-of-upper-body-anaerobic-pre-loading-on-2000-m-ergometer-rowing-performance-in-college-level-male-rowers
#14
Priit Purge, Peter Hofmann, Rait Merisaar, Alexander Mueller, Gerhard Tschakert, Jarek Mäestu, Jaak Jürimäe
Elevated blood lactate has been shown to influence subsequent anaerobic exercise due to an inhibition of glycolysis. The aim of the present study was therefore to investigate the influence of a short and high-intensity anaerobic arm crank pre-load exercise (HIE) added to a low-intensity warm-up on cardio-respiratory and metabolic responses on a subsequent all out rowing exercise. Nine well-trained college level male rowers (24.6 ± 7.1 yrs; 1.87 ± 0.07 m; 88.9 ± 9.8 kg; 18.5 ± 3.7% body fat) volunteered to participate in the study...
June 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28627298/a-prospective-transcranial-doppler-ultrasound-based-evaluation-of-the-acute-and-cumulative-effects-of-sport-related-concussion-on-neurovascular-coupling-response-dynamics
#15
Alexander D Wright, Jonathan D Smirl, Kelsey Bryk, Paul van Donkelaar
Sport-related concussion has been shown to alter cerebral blood flow (CBF) both acutely and chronically, and may exert cumulative effects across multiple injuries. Such dysfunction may be mediated by trauma-induced deficits to CBF control mechanisms, though our understanding of these effects is limited, including dynamics of neurovascular coupling (NVC) responses (i.e. CBF responses to neurologic demand). 179 junior-level contact sport athletes completed preseason testing - 42 reported never having experienced a concussion (Hx-) while 31 had endured three or more (Hx3+)...
June 18, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28623835/life-cycle-assessment-of-treatment-and-handling-options-for-a-highly-saline-brine-extracted-from-a-potential-co2-storage-site
#16
Hafiz H Salih, Jiaxing Li, Ruth Kaplan, Seyed A Dastgheib
Carbon dioxide (CO2) injection in deep saline aquifers is a promising option for CO2 geological sequestration. However, brine extraction may be necessary to control the anticipated increase in reservoir pressure resulting from CO2 injection. The extracted brines usually have elevated concentrations of total dissolved solids (TDS) and other contaminants and require proper handling or treatment. Different options for the handling or treatment of a high-TDS brine extracted from a potential CO2 sequestration site (Mt...
June 12, 2017: Water Research
https://www.readbyqxmd.com/read/28607068/how-temporal-patterns-in-rainfall-determine-the-geomorphology-and-carbon-fluxes-of-tropical-peatlands
#17
Alexander R Cobb, Alison M Hoyt, Laure Gandois, Jangarun Eri, René Dommain, Kamariah Abu Salim, Fuu Ming Kai, Nur Salihah Haji Su'ut, Charles F Harvey
Tropical peatlands now emit hundreds of megatons of carbon dioxide per year because of human disruption of the feedbacks that link peat accumulation and groundwater hydrology. However, no quantitative theory has existed for how patterns of carbon storage and release accompanying growth and subsidence of tropical peatlands are affected by climate and disturbance. Using comprehensive data from a pristine peatland in Brunei Darussalam, we show how rainfall and groundwater flow determine a shape parameter (the Laplacian of the peat surface elevation) that specifies, under a given rainfall regime, the ultimate, stable morphology, and hence carbon storage, of a tropical peatland within a network of rivers or canals...
June 27, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28598271/short-term-effects-of-ozone-air-pollution-on-hospital-admissions-for-myocardial-infarction-a-time-stratified-case-crossover-study-in-taipei
#18
Hui-Fen Chiu, Yi-Hao Weng, Ya-Wen Chiu, Chun-Yuh Yang
This study was undertaken to determine whether there was a correlation between ambient ozone (O3) levels and number of hospital admissions for myocardial infarction (MI) in Taipei, Taiwan. Hospital admissions for MI and ambient air pollution data for Taipei were obtained for the period from 2006 to 2010. The relative risk (RR) of hospital admissions for MI was estimated using a time-stratified case-crossover approach, controlling for weather variables, day of the week, seasonality, and long-term time trends...
2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28588583/hypercapnia-impairs-enac-cell-surface-stability-by-promoting-phosphorylation-polyubiquitination-and-endocytosis-of-%C3%AE-enac-in-a-human-alveolar-epithelial-cell-line
#19
Paulina Gwoździńska, Benno A Buchbinder, Konstantin Mayer, Susanne Herold, Rory E Morty, Werner Seeger, István Vadász
Acute lung injury is associated with formation of pulmonary edema leading to impaired gas exchange. Patients with acute respiratory distress syndrome (ARDS) require mechanical ventilation to improve oxygenation; however, the use of relatively low tidal volumes (to minimize further injury of the lung) often leads to further accumulation of carbon dioxide (hypercapnia). Hypercapnia has been shown to impair alveolar fluid clearance (AFC), thereby causing retention of pulmonary edema, and may lead to worse outcomes; however, the underlying molecular mechanisms remain incompletely understood...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28587448/from-si-ii-to-si-iv-and-back-reversible-intramolecular-carbon-carbon-bond-activation-by-an-acyclic-iminosilylene
#20
Daniel Wendel, Amelie Porzelt, Fabian A D Herz, Debotra Sarkar, Christian Jandl, Shigeyoshi Inoue, Bernhard Rieger
Reversibility is fundamental for transition metal catalysis, but equally for main group chemistry and especially low-valent silicon compounds, the interplay between oxidative addition and reductive elimination is key for a potential catalytic cycle. Herein, we report a highly reactive acyclic iminosilylsilylene 1, which readily performs an intramolecular insertion into a C═C bond of its aromatic ligand framework to give silacycloheptatriene (silepin) 2. UV-vis studies of this Si(IV) compound indicated a facile transformation back to Si(II) at elevated temperatures, further supported by density functional theory calculations and experimentally demonstrated by isolation of a silylene-borane adduct 3 following addition of B(C6F5)3...
June 21, 2017: Journal of the American Chemical Society
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