keyword
MENU ▼
Read by QxMD icon Read
search

Co2

keyword
https://www.readbyqxmd.com/read/28922531/stoichiometric-reactions-of-co2-and-indium-silylamides-and-catalytic-synthesis-of-ureas
#1
Maotong Xu, Andrew Jupp, Douglas Wade Stephan
The indium compounds In(N(SiMe3)2)2Cl*THF (2) and In(N(SiMe3)2)Cl2*(THF)n¬ (3) were shown to react with CO2 to give [(Me3Si)2N)InX(-OSiMe3)]2 (X = N(SiMe3)2 4, Cl 5). 0.05-2.0 mol% of the species 3 acts as a pre-catalyst for the conversion of aryl and alkyl silylamines under CO2 (2-3 atm.) to give the corresponding ureas in 70-99% yields. A proposed mechanism is supported by experimental and computational data.
September 18, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28922380/the-warburg-effect-as-an-adaptation-of-cancer-cells-to-rapid-fluctuations-in-energy-demand
#2
Tamir Epstein, Robert A Gatenby, Joel S Brown
To maintain optimal fitness, a cell must balance the risk of inadequate energy reserve for response to a potentially fatal perturbation against the long-term cost of maintaining high concentrations of ATP to meet occasional spikes in demand. Here we apply a game theoretic approach to address the dynamics of energy production and expenditure in eukaryotic cells. Conventionally, glucose metabolism is viewed as a function of oxygen concentrations in which the more efficient oxidation of glucose to CO2 and H2O produces all or nearly all ATP except under hypoxic conditions when less efficient (2 ATP/ glucose vs...
2017: PloS One
https://www.readbyqxmd.com/read/28922374/fractional-laser-exposure-induces-neutrophil-infiltration-n1-phenotype-into-the-tumor-and-stimulates-systemic-anti-tumor-immune-response
#3
Masayoshi Kawakubo, Shadmehr Demehri, Dieter Manstein
BACKGROUND: Ablative fractional photothermolysis (aFP) using a CO2 laser generates multiple small diameter tissue lesions within the irradiation field. aFP is commonly used for a wide variety of dermatological indications, including treatment of photodamaged skin and dyschromia, drug delivery and modification of scars due to acne, surgical procedures and burns. In this study we explore the utility of aFP for treating oncological indications, including induction of local tumor regression and inducing anti-tumor immunity, which is in marked contrast to current indications of aFP...
2017: PloS One
https://www.readbyqxmd.com/read/28921978/electrocatalytic-co2-reduction-by-imidazolium-functionalized-molecular-catalysts
#4
Siyoung Sung, Davinder Kumar, Marcos Gil-Sepulcre, Michael Nippe
We present the first examples of CO2 electro-reduction catalysts that feature charged imidazolium groups in the secondary coordination sphere. The functionalized Lehn-type catalysts display significant differences in their redox properties and improved catalytic activities as compared to the conventional reference catalyst. Our results suggest that the incorporated imidazolium moieties do not solely function as a charged tag but also alter mechanistic aspects of catalysis.
September 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28921891/enhanced-formation-of-c1-products-in-the-electroreduction-of-co2-by-adding-a-carbon-dioxide-adsorption-component-to-a-gas-diffusion-layer-type-catalytic-electrode
#5
Bhanu Chandra Marepally, Claudio Ampelli, Chiara Genovese, Tapish Saboo, Siglinda Perathoner, Florian M Wisser, Laurent Veyre, Jérôme Canivet, Elsje Alessandra Quadrelli, Gabriele Centi
The addition of a CO2 adsorption component (substituted imidazolate-based SIM-1 crystals) to a gas diffusion layer (GDL) type catalytic electrode allows to enhance the activity and especially the selectivity to >C1 carbon chain products (ethanol, acetone and isopropanol) of a Pt-based electrocatalyst that is not able to form products of CO2 reduction involving C-C bond formation under conventional (liquid-phase) conditions. This indicates that the increase of the CO2 effective concentration at the electrode active surface is the factor controlling the formation of >C1 products rather than only the intrinsic properties of the electrocatalyst...
September 18, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28921830/trends-application-and-future-prospectives-of-microbial-carbonic-anhydrase-mediated-carbonation-process-for-ccus
#6
REVIEW
Chintan Bhagat, Pravin Dudhagara, Shantilal Tank
Growing industrialisation and desire for better economy of countries accelerated the emission of greenhouse gasses, more than the buffering capacity of earth atmosphere. Among, various Green House Gasses (GHGs), CO2 occupies the first position in anthroposphere and has detrimental effects on the ecosystem. For decarbonization, several non-biological methods of carbon capture, utilisation, and storage (CCUS) are in use from last few decades, but they are suffering from narrow applicability. Recently, CO2 emission and its disposal related problem encourage for implementation of bioprocessing to achieve zero waste economy for a sustainable environment...
September 18, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28921550/sugars-from-woody-tissue-photosynthesis-reduce-xylem-vulnerability-to-cavitation
#7
Niels J F De Baerdemaeker, Roberto Luis Salomón, Linus De Roo, Kathy Steppe
Reassimilation of internal CO2 via woody tissue photosynthesis has a substantial effect on tree carbon income and wood production. However, little is known about its role in xylem vulnerability to cavitation and its implications in drought-driven tree mortality. Young trees of Populus nigra were subjected to light exclusion at the branch and stem levels. After 40 d, measurements of xylem water potential, diameter variation and acoustic emission (AE) were performed in detached branches to obtain acoustic vulnerability curves to cavitation following bench-top dehydration...
September 18, 2017: New Phytologist
https://www.readbyqxmd.com/read/28921479/erratum-to-development-of-a-circulation-direct-sampling-and-monitoring-system-for-o2-and-co2-concentrations-in-the-gas-liquid-phases-of-shake%C3%A2-flask-systems-during-microbial-cell-culture
#8
Masato Takahashi, Yoshisuke Sawada, Hideki Aoyagi
Following publication of the original article (Takahashi et al. 2017), the authors reported that there was a mistake in the legend of Figure 2.
September 18, 2017: AMB Express
https://www.readbyqxmd.com/read/28921478/interstitial-pneumonia-with-autoimmune-features-an-additional-risk-factor-for-ards
#9
Giacomo Grasselli, Beatrice Vergnano, Maria Rosa Pozzi, Vittoria Sala, Gabriele D'Andrea, Vittorio Scaravilli, Marco Mantero, Alberto Pesci, Antonio Pesenti
BACKGROUND: Interstitial pneumonia with autoimmune features (IPAF) identifies a recently recognized autoimmune syndrome characterized by interstitial lung disease and autoantibodies positivity, but absence of a specific connective tissue disease diagnosis or alternative etiology. We retrospectively reviewed the clinical presentation, diagnostic workup and management of seven critically ill patients who met diagnostic criteria for IPAF. We compared baseline characteristics and clinical outcome of IPAF patients with those of the population of ARDS patients admitted in the same period...
September 18, 2017: Annals of Intensive Care
https://www.readbyqxmd.com/read/28921217/effect-of-lower-and-higher-alcohol-fuel-synergies-in-biofuel-blends-and-exhaust-treatment-system-on-emissions-from-ci-engine
#10
Thiyagarajan Subramanian, Edwin Geo Varuvel, Leenus Jesu Martin, Nagalingam Beddhannan
The present study deals with performance, emission and combustion studies in a single cylinder CI engine with lower and higher alcohol fuel synergies with biofuel blends and exhaust treatment system. Karanja oil methyl ester (KOME), widely available biofuel in India, and orange oil (ORG), a low carbon biofuel, were taken for this study, and equal volume blend was prepared for testing. Methanol (M) and n-pentanol (P) was taken as lower and higher alcohol and blended 20% by volume with KOME-ORG blend. Activated carbon-based exhaust treatment indigenous system was designed and tested with KOME-ORG + M20 and KOME-ORG + P20 blend...
September 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28920666/a-softoxometalate-k6-5cu-oh-8-5-h2o-7-5-0-5-k3pw12o40-n-n-1348-2024-as-an-efficient-inorganic-material-for-co2-reduction-with-concomitant-water-oxidation
#11
Santu Das, Saurabh Kumar, Somenath Garai, Ramudu Pochamoni, Shounik Paul, Soumyajit Roy
An immediate challenge for chemists is to devise different methods to trap chemical energy using light by reduction of carbon dioxide to a transportable fuel. To reach this goal the major obstacle lies in finding a suitable material that is abundant and possesses catalytic power to effect such reduction reaction and perform this reduction reaction without using any external photosensitizer. Here we report first time a softoxometalate, based on {[K6.5Cu(OH)8.5(H2O)7.5]0.5[K3PW12O40]} metal oxide framework which is stable in reaction condition that effectively performs photochemical CO2 reduction reaction in water with a very high turnover number of 613 and TOF of 47...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28920603/controlling-cation-segregation-in-perovskite-based-electrodes-for-high-electro-catalytic-activity-and-durability
#12
REVIEW
Yifeng Li, Wenqiang Zhang, Yun Zheng, Jing Chen, Bo Yu, Yan Chen, Meilin Liu
Solid oxide cell (SOC) based energy conversion systems have the potential to become the cleanest and most efficient systems for reversible conversion between electricity and chemical fuels due to their high efficiency, low emission, and excellent fuel flexibility. Broad implementation of this technology is however hindered by the lack of high-performance electrode materials. While many perovskite-based materials have shown remarkable promise as electrodes for SOCs, cation enrichment or segregation near the surface or interfaces is often observed, which greatly impacts not only electrode kinetics but also their durability and operational lifespan...
September 18, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28920161/tapered-us-carbon-emissions-during-good-times-what-s-old-what-s-new
#13
Yoke-Kee Eng, Chin-Yoong Wong
In light of a slow buildup in CO2 emissions since the recovery, this paper revisits the relationship between CO2 emissions and the US economy using a nonlinear autoregressive distributed lag model, in which the determinants are identified through an expanded real business cycle model. We find convincing evidence that CO2 emissions decline more rapidly during recessions than increase during expansions over the long run. Of all determinants considered, long-run asymmetry is fostered once vehicle miles traveled is controlled...
September 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28920141/effects-of-moso-bamboo-phyllostachys-edulis-invasions-on-soil-nitrogen-cycles-depend-on-invasion-stage-and-warming
#14
Zhenzhen Li, Ling Zhang, Bangliang Deng, Yuanqiu Liu, Fanqian Kong, Guoxian Huang, Qin Zou, Qian Liu, Xiaomin Guo, Yanqiu Fu, Dekui Niu, Evan Siemann
Plant invasions may alter soil nutrient cycling due to differences in physiological traits between the invader and species they displace as well as differences in responses to anthropogenic factors such as nitrogen deposition and warming. Moso bamboo is expanding its range rapidly around the world, displacing diverse forests. In addition, near expansion fronts where invasions are patchy, moso bamboo and other species each contribute soil inputs. Nitrogen transformations and greenhouse gas (GHG) emissions are important processes associated with nutrient availability and climate change that may be impacted by bamboo invasions...
September 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28920090/reconstructing-coral-calcification-fluid-dissolved-inorganic-carbon-chemistry-from-skeletal-boron-an-exploration-of-potential-controls-on-coral-aragonite-b-ca
#15
Nicola Allison
The boron geochemistry of coral skeletons reflects the dissolved inorganic carbon (DIC) chemistry of the calcification fluid from which the skeletons precipitates and may be a valuable tool to investigate the effects of climate change on coral calcification. In this paper I calculate the predicted B/Ca of aragonite precipitating from seawater based fluids as a function of pH, [DIC] and [Ca(2+)]. I consider how different co-precipitating DIC species affect aragonite B/Ca and also estimate the impact of variations in the B(OH)4(-)/co-precipitating DIC aragonite partition coefficient (KD), which may be associated with changes in the DIC and Ca(2+) chemistry of the calcification fluid...
August 2017: Heliyon
https://www.readbyqxmd.com/read/28920086/organic-compounds-generated-after-the-flow-of-water-through-micro-orifices-were-they-synthesized
#16
Tomiichi Hasegawa, Akiomi Ushida, Masaki Goda, Yasushi Ono
Micro-fluid mechanics is an important area of research in modern fluid mechanics because of its many potential industrial and biological applications. However, the field is not fully understood yet. In previous work, when passing ultrapure water (UPW) in which air was dissolved (UPW*) through micro-orifices, we found that the flow velocity decreased and stopped over time, and membranes were frequently formed in the orifice when the flow stopped. The membrane came from the dissolved air in UPW*, and membrane formation was closely related to electric charges generated in orifices by the flow...
August 2017: Heliyon
https://www.readbyqxmd.com/read/28919932/separating-thermodynamics-from-kinetics-a-new-understanding-of-the-transketolase-reaction
#17
Stefan R Marsden, Lorina Gjonaj, Stephen J Eustace, Ulf Hanefeld
Transketolase catalyzes asymmetric C-C bond formation of two highly polar compounds. Over the last 30 years, the reaction has unanimously been described in literature as irreversible because of the concomitant release of CO2 if using lithium hydroxypyruvate (LiHPA) as a substrate. Following the reaction over a longer period of time however, we have now found it to be initially kinetically controlled. Contrary to previous suggestions, for the non-natural conversion of synthetically more interesting apolar substrates, the complete change of active-site polarity is therefore not necessary...
May 23, 2017: ChemCatChem
https://www.readbyqxmd.com/read/28919927/characterization-of-a-heat-tolerant-chlorella-sp-gd-mutant-with-enhanced-photosynthetic-co2-fixation-efficiency-and-its-implication-as-lactic-acid-fermentation-feedstock
#18
Tse-Min Lee, Yu-Fei Tseng, Chieh-Lun Cheng, Yi-Chuan Chen, Chih-Sheng Lin, Hsiang-Yen Su, Te-Jin Chow, Chun-Yen Chen, Jo-Shu Chang
BACKGROUND: Fermentative production of lactic acid from algae-based carbohydrates devoid of lignin has attracted great attention for its potential as a suitable alternative substrate compared to lignocellulosic biomass. RESULTS: A Chlorella sp. GD mutant with enhanced thermo-tolerance was obtained by mutagenesis using N-methyl-N'-nitro-N-nitrosoguanidine to overcome outdoor high-temperature inhibition and it was used as a feedstock for fermentative lactic acid production...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28919151/the-combined-effects-of-ocean-warming-and-acidification-on-shallow-water-meiofaunal-assemblages
#19
Matthew R Lee, Rodrigo Torres, Patricio H Manríquez
Climate change due to increased anthropogenic CO2 in the atmosphere is causing an increase in seawater temperatures referred to as ocean warming and a decrease in seawater pH, referred to as ocean acidification. The meiofauna play an important role in the ecology of marine ecosystems and the functions they provide. Using microcosms, meiofaunal assemblages were exposed to two temperatures (15 and 19 °C) and two pHs (pCO2 of 400 and 1000 ppm), both individually and in combination, for a period of 90 days. The hypothesis that increased temperature will increase meiofaunal abundance was not supported...
September 8, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28918526/coupling-population-dynamics-with-earth-system-models-the-popem-model
#20
Andrés Navarro, Raúl Moreno, Alfonso Jiménez-Alcázar, Francisco J Tapiador
Precise modeling of CO2 emissions is important for environmental research. This paper presents a new model of human population dynamics that can be embedded into ESMs (Earth System Models) to improve climate modeling. Through a system dynamics approach, we develop a cohort-component model that successfully simulates historical population dynamics with fine spatial resolution (about 1°×1°). The population projections are used to improve the estimates of CO2 emissions, thus transcending the bulk approach of existing models and allowing more realistic non-linear effects to feature in the simulations...
September 16, 2017: Environmental Science and Pollution Research International
keyword
keyword
6243
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"