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Showing 1 to 20 of 76 for “"deoxygenation"”.
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Mechanistic and preparative studies of Electrochemical Deoxygenation and Debromination
The indirect deoxygenation of a range of secondary and tertiary alcohols has been achieved via the electrochemical reduction of the corresponding 3,5- bis(trifluoromethyl)benzoates in up to 93% isolated yield. The reactions were carried out using graphite electrodes in NMP as the solvent, at …
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Zeolite supported/non-noble metal catalysts for the deoxygenation of fatty acids to transportation fuels
… and unsaturated fatty acids. By selective deoxygenation, these oils can be converted to diesel or gasoline range hydrocarbons over heterogeneous catalysts. Active areas of development in the valorization of fatty acids include: one-pot continuous conversion of both saturated and unsaturated …
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Open, stirred-jar technique for estimation of microbial deoxygenation in the prediction of dissolved oxygen profiles in streams
… Thus, the conditions in the jars resemble the deoxygenation process in the stream more closely than the BOD-bottle test. There is no need of assuming any particular type of kinetic behavior, because the procedure gives directly an oxygen-uptake curve. Long lags before nitrification were …
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The Effects of Short Work Versus Longer Work Periods Within Intermittent Exercise on VO2 Kinetics, Muscle Deoxygenation and Energy System Contribution
… response of oxygen uptake (V̇O2)and muscle deoxygenation (HHb) in males (24 yr±3, n = 10) to identical heavy intensity continuous (CONT), and intermittent work; 25 s (25 s work: 3 s recovery (20W)), and 10 s (10 s work: 3 s recovery (20W)), were compared. The τV̇O2 were similar in all …
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Marine Deoxygenation Predates the End-Triassic Mass Extinction Within the Equatorial Panthalassa and its Influence on Marine Ecosystems Before the Biotic Crisis
… data from Grotto Creek reflect a progressive deoxygenation of the upper water column with the expansion of the equatorial oxygen minimum zone (OMZ). Specifically, the δ15N excursion reflects a shift in the dominant processing of bioavailable nitrogen from uptake and nitrification under oxic …
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Unraveling Paleoenvironmental Stress in the Late Devonian and Mississippian: Insights into Redox Dynamics and Photosynthetic Adaptations Elucidated Through Geochemical Proxies
… by many researchers. One proposed driver, marine deoxygenation, requires further investigation given our current state of understanding. The first two chapters of this dissertation explore the temporal and geographic extent of marine deoxygenation during the Devonian Lower and Upper Kellwasser …
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o-Nitrosophenol complexes and their synthetic potential
… 4-bromo, 4-methyl and 5-methoxy) resulted in deoxygenation to give mainly bis(2-triphenylphosphiniminophenolato) nickel(ll), Similarly the interaction of triphenyl phosphine with Zn(qO)2 (qOH = 5-methoxy-2- nitrosophenol) involved deoxygenation and formation of …
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Evaluating redox cycling across the Toarcian Oceanic Anoxic Event with implications for paleo-environmental reconstructions and organic matter sulfurization
… history, particularly intervals where marine deoxygenation occurred, are crucial to investigating the changes in habitability on Earth. Marine deoxygenation events, in particular, can result in changes in the carbon, sulfur, and iron cycles on our planet. Changes in these elemental cycles lead …
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Investigation of transition structure geometries for the transfer of oxygen from heteroatoms to phosphorus
The deoxygenation of a functional group containing an oxygen-heteroatom bond by a trivalent phosphorus compound to give the corresponding deoxygenated substrate and oxidized phosphorus compound is a reaction of synthetic and mechanistic importance. The endocyclic restriction test was utilized in …
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Mechanisms of impaired red blood cell ATP release in older adults: implications for altered vascular control with age
… healthy older adults in response to hemoglobin deoxygenation and identifying a potential role of this impairment in the declines in vascular control of peripheral blood flow with advancing age. Advancing age is the primary risk factor for cardiovascular disease (CVD), which is the leading cause …
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Polarity Inversion in Silicon and Phosphorus Compounds
… described. This cycloaddition initiates stepwise deoxygenation by silicon(II), and the application of this rare mode of reactivity to a room-temperature variant of the Cadogan reaction will be detailed. In a second section, tetragonal phosphorus(V) cations supported by a macrocyclic ligand …
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ΣΥΝΘΕΣΗ ΦΑΣΜΑΤΟΣΚΟΠΙΚΗ ΚΑΙ ΚΒΑΝΤΟΧΗΜΙΚΗ ΜΕΛΕΤΗ ΣΥΜΠΥΚΝΩΜΕΝΩΝ (Β) ΚΙΝΟΞΑΛΙΝΙΚΩΝ ΣΥΣΤΗΜΑΤΩΝ ΚΑΙ ΠΑΡΑΓΩΓΩΝ ΤΟΥΣ
… OF PYRAZINO [2,3-B] QUINOXALINE 1,4-DIOXIDDES. DEOXYGENATION OF 1,4-DIOXIDES ANDSYNTHESIS OF PYRAZINO [2,3-B] QUINOXALINES. ELECTRON SPECTROSCOPY OF CORRELATION OF SPECTROCHEMICAL DATA WITH THE RESULTS OF QUANTUM CALCULATIONS (CNDO/2-CI METHOD). INFRARED SPECTROSCOPY. NUCLEAR MAGNETIC RESONANCE …
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Chemical vapor deposition of copper, copper(I) oxide, and silver from metal-organic precursors
… mechanism and copper metal is formed by deoxygenation of an initially deposited copper(I) oxide phase.
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Fingerprints and Drivers of Recent Changes in Oceanic Oxygen: From Regional to Global Scales
… inventory of the global ocean, termed ocean deoxygenation, is a likely consequence of on-going anthropogenic warming. The contribution of external forcing factors to observed changes in dissolved oxygen concentration ([O2]) relative to natural internal variability is examined using …
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Scope and stereochemistry of carbon-carbon bond formation via addition of carbon nucleophiles to nitrones
… can be explained by a chelation model. N-Deoxygenation of N,N-dialkylhydroxylamines was achieved by reduction with trivalent phosphorus reagents via desulfurization of their thionocarbonate derivatives. The mechanism of the desulfurization reaction has been studied by a double labelling …
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Partial Upgrading of Lignocellulosic Bio-Oil via Deep Catalytic Hydrotreating
… of the product, but it improves the degree of deoxygenation and molar H/C ratio. Moreover, at temperatures higher than 350 C, hydrocracking along with hydrogenation notably improved the residue conversion, viscosity and MCR reduction. Comparing the performance of catalysts showed that CAT-M5, …
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A multiproxy investigation of oceanic redox conditions during the Cambrian SPICE event
… interval to assess potential global changes in deoxygenation across the event. These iron speciation analyses showed shallow environments deoxygenated coincident with the initiation of the SPICE and extinction horizons, and these conditions were dominantly ferruginous. Importantly, this work …
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Synthesis of aza-tryptophan derivatives.
… necessary for the intended product. Subsequent deoxygenation and deprotection of the indole, ring, and the amino and acid functional groups yielded racemic 7-azatryptophan A variety of attempts to synthesize the enantiomerically pure form of 7-azatryptophan were considered. Of those Evans' …
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Synthesis and Biological Evaluation of 2'-Deoxyribonucleotide Analogs
… The first involves regioselective reductive deoxygenation of a suitably derivatized ribonucleoside. Tri-n-butyltin hydride reduction of a 2'-thiobenzoate derivative affords the desired 2'-deoxyribonucleoside in good yield. The second method for 2'-deoxyribonucleoside synthesis involves the …
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Design and development of a mechatronic training simulator for adult ECMO
… blood simulant to simulate oxygenation and deoxygenation. The simulator is integrated with a mathematical model of human physiology to simulate real-time patient vitals and training scenarios, and to control the trainer hardware. We present results related to successful cannulation under …
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