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elevated carbon dioxide

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https://www.readbyqxmd.com/read/28338970/woody-plant-ecosystems-under-climate-change-and-air-pollution-response-consistencies-across-zonobiomes
#1
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/28325659/construction-of-a-novel-d-lactate-producing-pathway-from-dihydroxyacetone-phosphate-of-the-calvin-cycle-in-cyanobacterium-synechococcus-elongatus-pcc%C3%A2-7942
#2
Yasutaka Hirokawa, Ryota Goto, Yoshitaka Umetani, Taizo Hanai
Using engineered cyanobacteria to produce various chemicals from carbon dioxide is a promising technology for a sustainable future. Lactate is a valuable commodity that can be used for the biodegradable plastic, polylactic acid. Typically, lactate production using engineered cyanobacteria was via the conversion of pyruvate in glycolysis by lactate dehydrogenase. In cyanobacteria, the metabolic flux in the Calvin cycle is higher than that in glycolysis under photoautotrophic conditions. The construction of a novel lactate producing pathway that uses metabolites from the Calvin cycle could potentially increase lactate productivity in cyanobacteria...
March 18, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28321801/acute-hyperventilation-increases-the-central-venous-to-arterial-pco2-difference-in-stable-septic-shock-patients
#3
Jihad Mallat, Usman Mohammad, Malcolm Lemyze, Mehdi Meddour, Marie Jonard, Florent Pepy, Gaelle Gasan, Stephanie Barrailler, Johanna Temime, Nicolas Vangrunderbeeck, Laurent Tronchon, Didier Thevenin
BACKGROUND: To evaluate the effects of acute hyperventilation on the central venous-to-arterial carbon dioxide tension difference (∆PCO2) in hemodynamically stable septic shock patients. METHODS: Eighteen mechanically ventilated septic shock patients were prospectively included in the study. We measured cardiac index (CI), ∆PCO2, oxygen consumption (VO2), central venous oxygen saturation (ScvO2), and blood gas parameters, before and 30 min after an increase in alveolar ventilation (increased respiratory rate by 10 breaths/min)...
December 2017: Annals of Intensive Care
https://www.readbyqxmd.com/read/28319841/mesoporous-magnesium-oxide-nanoparticles-derived-via-complexation-combustion-for-enhanced-performance-in-carbon-dioxide-capture
#4
Vishwanath Hiremath, Raghavendra Shavi, Jeong Gil Seo
Magnesium oxide (MgO) is a promising candidate for carbon dioxide (CO2) capture at high temperature applicable to pre-combustion capture in an integrated gasification combined cycle (IGCC) scheme. In this work, mesoporous MgO nanoparticles were synthesized via simple complexation-combustion method by using glycine (G) and urea (U) as fuels (F). The obtained sorbents were thoroughly characterized in terms of the crystalline structure, morphology, nature of the fuel, F/O ratio, and their consequent effects on CO2 sorption...
March 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28319717/land-use-regression-modelling-of-air-pollution-in-high-density-high-rise-cities-a-case-study-in-hong-kong
#5
Martha Lee, Michael Brauer, Paulina Wong, Robert Tang, Tsz Him Tsui, Crystal Choi, Wei Cheng, Poh-Chin Lai, Linwei Tian, Thuan-Quoc Thach, Ryan Allen, Benjamin Barratt
Land use regression (LUR) is a common method of predicting spatial variability of air pollution to estimate exposure. Nitrogen dioxide (NO2), nitric oxide (NO), fine particulate matter (PM2.5), and black carbon (BC) concentrations were measured during two sampling campaigns (April-May and November-January) in Hong Kong (a prototypical high-density high-rise city). Along with 365 potential geospatial predictor variables, these concentrations were used to build two-dimensional land use regression (LUR) models for the territory...
March 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28291085/respiratory-effects-of-the-nociceptin-orphanin-fq-peptide-and-opioid-receptor-agonist-cebranopadol-in-healthy-human-volunteers
#6
Albert Dahan, Merel Boom, Elise Sarton, Justin Hay, Geert Jan Groeneveld, Meike Neukirchen, John Bothmer, Leon Aarts, Erik Olofsen
BACKGROUND: Cebranopadol is a novel strong analgesic that coactivates the nociceptin/orphanin FQ receptor and classical opioid receptors. There are indications that activation of the nociceptin/orphanin FQ receptor is related to ceiling in respiratory depression. In this phase 1 clinical trial, we performed a pharmacokinetic-pharmacodynamic study to quantify cebranopadol's respiratory effects. METHODS: Twelve healthy male volunteers received 600 μg oral cebranopadol as a single dose...
April 2017: Anesthesiology
https://www.readbyqxmd.com/read/28288918/increased-carbon-dioxide-levels-stimulate-neutrophils-to-produce-microparticles-and-activate-the-nucleotide-binding-domain-like-receptor-3-inflammasome
#7
Stephen R Thom, Veena M Bhopale, JingPing Hu, Ming Yang
We hypothesized that elevations of carbon dioxide (CO2) commonly found in modern buildings will stimulate leukocytes to produce microparticles (MPs) and activate the nucleotide-binding domain-like receptor 3 (NLRP3) inflammasome due to mitochondrial oxidative stress. Human and murine neutrophils generate MPs with high interleukin-1β (IL-1β) content when incubated ex vivo in buffer equilibrated with 0.1-0.4% additional CO2. Enhanced MPs production requires mitochondrial reactive oxygen species production, which is mediated by activities of pyruvate carboxylase and phosphoenolpyruvate carboxykinase...
March 10, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28283983/parthenium-weed-parthenium-hysterophorus-l-and-climate-change-the-effect-of-co2-concentration-temperature-and-water-deficit-on-growth-and-reproduction-of-two-biotypes
#8
Thi Nguyen, Ali Ahsan Bajwa, Sheldon Navie, Chris O'Donnell, Steve Adkins
Climate change will have a considerable impact upon the processes that moderate weed invasion, in particular to that of parthenium weed (Parthenium hysterophorus L.). This study evaluated the performance of two Australian biotypes of parthenium weed under a range of environmental conditions including soil moisture (100 and 50% of field capacity), atmospheric carbon dioxide (CO2) concentration (390 and 550 ppm), and temperature (35/20 and 30/15 °C/day/night). Measurements were taken upon growth, reproductive output, seed biology (fill, viability and dormancy) and soil seed longevity...
March 11, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28283852/short-term-general-anesthesia-for-retro-bulbar-block-in-ophthalmic-surgery-generates-no-significant-hypercapnia
#9
Werner Baulig, Monica Weber, Beatrice Beck-Schimmer, Oliver M Theusinger, Peter Biro
To assess the impact of short time hypnosis for retro-bulbar anesthesia on ventilation in patients undergoing ophthalmic surgery of the anterior eye chamber. In all patients, a combined continuous transcutaneous carbon dioxide tension (PtcCO2) and partial oxygen saturation (SpO2) measurement was applied in addition to routine monitoring. To enable unconscious application of retro-bulbar anesthesia, intravenous thiopental was given in one to multiple bolus doses. Transient breathing support included chin lift, Esmarch maneuver and manual hand-bag ventilation via face mask...
March 11, 2017: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/28273516/2-d-clinorotation-alters-the-uptake-of-some-nutrients-in-arabidopsis-thaliana
#10
Ellen Polinski, Oliver Schueler, Lars Krause, Monika A Wimmer, Ruth Hemmersbach, Heiner E Goldbach
Future long-term spaceflight missions rely on bioregenerative life support systems (BLSS) in order to provide the required resources for crew survival. Higher plants provide an essential part since they supply food and oxygen and recycle carbon dioxide. There are indications that under space conditions plants might be inefficient regarding the uptake, transport and distribution of nutrients, which in turn affects growth and metabolism. Therefore, Arabidopsis thaliana (Col-0) seeds were germinated and grown for five days under fast clinorotation (2-D clinostat, 60rpm) in order to simulate microgravity...
February 16, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28267950/falsely-elevated-inspiratory-carbon-dioxide-fraction-when-reusing-a-disposable-filter-in-the-end-tidal-carbon-dioxide-sampling-line
#11
C A Brunsdon, T J Martin
No abstract text is available yet for this article.
March 2017: Anaesthesia and Intensive Care
https://www.readbyqxmd.com/read/28267345/high-indexed-pt3ni-alloy-tetrahexahedral-nanoframes-evolved-through-preferential-co-etching
#12
Chenyu Wang, Lihua Zhang, Hongzhou Yang, Jinfong Pan, Jingyue Liu, Charles Dotse, Yiliang Luan, Rui Gao, Cuikun Lin, Jun Zhang, James P Kilcrease, Xiaodong Wen, Shouzhong Zou, Jiye Fang
Chemically controlling crystal structures in nanoscale is challenging, yet provides an effective way to improve catalytic performances. Pt-based nanoframes are a new class of nanomaterials that have great potential as high-performance catalysts. To date, these nanoframes are formed through acid etching in aqueous solutions, which demands long reaction time and often yields ill-defined surface structures. Herein we demonstrate a robust and unprecedented protocol for facile development of high-performance nanoframe catalysts using size and crystallographic facet-controlled PtNi4 tetrahexahedral nanocrystals prepared through a colloidal synthesis approach as precursors...
March 14, 2017: Nano Letters
https://www.readbyqxmd.com/read/28267246/leaf-and-canopy-scale-drivers-of-genotypic-variation-in-soybean-response-to-elevated-carbon-dioxide-concentration
#13
Álvaro Sanz-Sáez, Robert P Koester, David M Rosenthal, Christopher M Montes, Donald R Ort, Elizabeth A Ainsworth
The atmospheric [CO2 ] in which crops grow today is greater than at any point in their domestication history, and represents an opportunity for positive effects on seed yield that can counteract the negative effects of greater heat and drought this century. In order to maximize yields under future atmospheric [CO2 ], we need to identify and study crop cultivars that respond most favorably to elevated [CO2 ] and understand the mechanisms contributing to their responsiveness. Soybean (Glycine max Merr.) is a widely grown oilseed crop and shows genetic variation in response to elevated [CO2 ]...
March 7, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28236545/air-pollution-and-st-elevation-myocardial-infarction-treated-with-primary-percutaneous-coronary-angioplasty-a-direct-correlation
#14
Marco Zuin, Gianluca Rigatelli, Fabio dell'Avvocata, Claudio Picariello, Luca Conte, Lina Marcantoni, Paolo Cardaioli, Giovanni Zuliani, Loris Roncon
PURPOSE: The relationships between air pollutant concentration levels and admission for primary percutaneous coronary intervention (PCI) in patients with ST-elevation myocardial infarction (STEMI) have never been assessed. METHODS: We retrospectively reviewed 4 consecutive years of medical and instrumental data (1st January 2012 to 1st March 2016) to identify patients admitted with STEMI and subsequently treated with primary PCI in our third referral center. Daily atmospheric pressure data (in hectopascal [hPa]) and air pollutant concentration levels were obtained from the regional meteorological service which had a monitoring site in our city (Rovigo, Italy)...
February 16, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28235510/effect-of-stellate-ganglion-block-on-hemodynamics-and-stress-responses-during-co2-pneumoperitoneum-in-elderly-patients
#15
Yong-Quan Chen, Yu-Yizi Xie, Bin Wang, Xiao-Ju Jin
STUDY OBJECTIVE: Elderly patients undergoing elective laparoscopic cholecystectomy (LC) were given right stellate ganglion block (RSGB) to observe its effects on the hemodynamics and stress response during carbon dioxide (CO2)-pneumoperitoneum. DESIGN: A randomized, single-blinded, and placebo-controlled study. SETTING: University-affiliated teaching hospital. PARTICIPANTS: Sixty patients (aged 65-78years; weight, 45-75kg; American Society of Anesthesiologists (ASA) physical status classification, class I or II) undergoing elective LC...
February 2017: Journal of Clinical Anesthesia
https://www.readbyqxmd.com/read/28228348/carbon-dioxide-in-carbonated-beverages-induces-ghrelin-release-and-increased-food-consumption-in-male-rats-implications-on-the-onset-of-obesity
#16
Dureen Samandar Eweis, Fida Abed, Johnny Stiban
BACKGROUND: The dangerous health risks associated with obesity makes it a very serious public health issue. Numerous studies verified a correlation between the increase in obesity and the parallel increase in soft drink consumption among world populations. The effects of one main component in soft drinks namely the carbon dioxide gas has not been studied thoroughly in any previous research. METHODS: Male rats were subjected to different categories of drinks and evaluated for over a year...
February 19, 2017: Obesity Research & Clinical Practice
https://www.readbyqxmd.com/read/28217746/integrated-regulatory-and-metabolic-networks-of-the-marine-diatom-phaeodactylum-tricornutum-predict-the-response-to-rising-co2-levels
#17
Jennifer Levering, Christopher L Dupont, Andrew E Allen, Bernhard O Palsson, Karsten Zengler
Diatoms are eukaryotic microalgae that are responsible for up to 40% of the ocean's primary productivity. How diatoms respond to environmental perturbations such as elevated carbon concentrations in the atmosphere is currently poorly understood. We developed a transcriptional regulatory network based on various transcriptome sequencing expression libraries for different environmental responses to gain insight into the marine diatom's metabolic and regulatory interactions and provide a comprehensive framework of responses to increasing atmospheric carbon levels...
January 2017: MSystems
https://www.readbyqxmd.com/read/28202652/effects-of-elevated-carbon-dioxide-and-temperature-on-locomotion-and-the-repeatability-of-lateralization-in-a-keystone-marine-mollusc
#18
Paolo Domenici, Rodrigo Torres, Patricio H Manríquez
Recent work has shown that the behaviour of marine organisms can be affected by elevated PCO2 , although little is known about the effect of multiple stressors. We therefore investigated the effect of elevated PCO2  and temperature on locomotion and behaviour during prey searching in the marine gastropod Concholepas concholepas, a predator characteristic of the southeastern Pacific coast. Movement duration, decision time, route finding and lateralization were measured using a T-maze tank with a prey positioned behind a barrier...
February 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28192893/non-invasive-ventilation-improves-respiratory-distress-in-children-with-acute-viral-bronchiolitis-a-systematic-review
#19
Yann Combret, Guillaume Prieur, Pascal LE Roux, Clément Médrinal
BACKGROUND: Non-invasive ventilation (NIV) is a common treatment for bronchiolitis. However, consensus concerning its efficacy is lacking. The aim of this systematic review was to assess NIV effectiveness to reduce respiratory distress. Secondary objectives were to summarize the effects of NIV, identify predictive factors for failure and describe settings and applications. METHODS: Searches were conducted in MEDLINE Pubmed, PEDro, COCHRANE, EMBASE, CINAHL, Web of Science, Up-todate and Sudoc from 1990 to April 2015...
February 13, 2017: Minerva Anestesiologica
https://www.readbyqxmd.com/read/28191584/sizable-dynamics-in-small-pores-co2-location-and-motion-in-the-%C3%AE-mg-formate-metal-organic-framework
#20
Yuanjun Lu, Bryan E G Lucier, Yue Zhang, Pengju Ren, Anmin Zheng, Yining Huang
Metal-organic frameworks (MOFs) are promising materials for carbon dioxide (CO2) adsorption and storage; however, many details regarding CO2 dynamics and specific adsorption site locations within MOFs remain unknown, restricting the practical uses of MOFs for CO2 capture. The intriguing α-magnesium formate (α-Mg3(HCOO)6) MOF can adsorb CO2 and features a small pore size. Using an intertwined approach of (13)C solid-state NMR (SSNMR) spectroscopy, (1)H-(13)C cross-polarization SSNMR, and computational molecular dynamics (MD) simulations, new physical insights and a rich variety of information have been uncovered regarding CO2 adsorption in this MOF, including the surprising suggestion that CO2 motion is restricted at elevated temperatures...
February 13, 2017: Physical Chemistry Chemical Physics: PCCP
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