An enzyme system that catalyzes the fixing of nitrogen in soil bacteria and blue-green algae (CYANOBACTERIA). EC 1.18.6.1.
The process in certain BACTERIA; FUNGI; and CYANOBACTERIA converting free atmospheric NITROGEN to biologically usable forms of nitrogen, such as AMMONIA; NITRATES; and amino compounds.
Hydrocarbons with at least one triple bond in the linear portion, of the general formula Cn-H2n-2.
Tungsten. A metallic element with the atomic symbol W, atomic number 74, and atomic weight 183.85. It is used in many manufacturing applications, including increasing the hardness, toughness, and tensile strength of steel; manufacture of filaments for incandescent light bulbs; and in contact points for automotive and electrical apparatus.
A genus of gram-negative, aerobic bacteria found in soil and water. Its organisms occur singly, in pairs or irregular clumps, and sometimes in chains of varying lengths.
A genus of gram-negative, ellipsoidal or rod-shaped bacteria whose major source of energy and reducing power is from the oxidation of ammonia to nitrite. Its species occur in soils, oceans, lakes, rivers, and sewage disposal systems.
Organic compounds composed exclusively of carbon and hydrogen where no carbon atoms join to form a ring structure.
Derivatives of ethylene, a simple organic gas of biological origin with many industrial and biological use.
A non-heme iron-sulfur protein isolated from Clostridium pasteurianum and other bacteria. It is a component of NITROGENASE, which is active in nitrogen fixation, and consists of two subunits with molecular weights of 59.5 kDa and 50.7 kDa, respectively.
Nitrogen oxide (N2O). A colorless, odorless gas that is used as an anesthetic and analgesic. High concentrations cause a narcotic effect and may replace oxygen, causing death by asphyxia. It is also used as a food aerosol in the preparation of whipping cream.
The first chemical element in the periodic table. It has the atomic symbol H, atomic number 1, and atomic weight [1.00784; 1.00811]. It exists, under normal conditions, as a colorless, odorless, tasteless, diatomic gas. Hydrogen ions are PROTONS. Besides the common H1 isotope, hydrogen exists as the stable isotope DEUTERIUM and the unstable, radioactive isotope TRITIUM.
A group of PROTEOBACTERIA represented by morphologically diverse, anaerobic sulfidogens. Some members of this group are considered bacterial predators, having bacteriolytic properties.
A chemical reaction in which an electron is transferred from one molecule to another. The electron-donating molecule is the reducing agent or reductant; the electron-accepting molecule is the oxidizing agent or oxidant. Reducing and oxidizing agents function as conjugate reductant-oxidant pairs or redox pairs (Lehninger, Principles of Biochemistry, 1982, p471).
A species of gram-negative, aerobic bacteria first isolated from soil in Vineland, New Jersey. Ammonium and nitrate are used as nitrogen sources by this bacterium. It is distinguished from other members of its genus by the ability to use rhamnose as a carbon source. (From Bergey's Manual of Determinative Bacteriology, 9th ed)
The simplest saturated hydrocarbon. It is a colorless, flammable gas, slightly soluble in water. It is one of the chief constituents of natural gas and is formed in the decomposition of organic matter. (Grant & Hackh's Chemical Dictionary, 5th ed)
A metallic element with the atomic symbol Mo, atomic number 42, and atomic weight 95.94. It is an essential trace element, being a component of the enzymes xanthine oxidase, aldehyde oxidase, and nitrate reductase. (From Dorland, 27th ed)
A genus of gram-negative, curved and spiral-shaped bacteria found in stagnant, freshwater environments. These organisms are motile by bipolar tufts of flagella having a long wavelength and about one helical turn. Some species of Spirillum cause a form of RAT-BITE FEVER.
A colorless alkaline gas. It is formed in the body during decomposition of organic materials during a large number of metabolically important reactions. Note that the aqueous form of ammonia is referred to as AMMONIUM HYDROXIDE.
An element with the atomic symbol N, atomic number 7, and atomic weight [14.00643; 14.00728]. Nitrogen exists as a diatomic gas and makes up about 78% of the earth's atmosphere by volume. It is a constituent of proteins and nucleic acids and found in all living cells.
Hydrocarbon-rich byproducts from the non-fossilized BIOMASS that are combusted to generate energy as opposed to fossilized hydrocarbon deposits (FOSSIL FUELS).
Use for articles on the investing of funds for income or profit.

Comparative phylogeny of rrs and nifH genes in the Bacillaceae. (1/323)

The rrs (16S rDNA) gene sequences of nitrogen-fixing endospore-forming bacilli isolated from the rhizosphere of wheat and maize were determined in order to infer their phylogenetic position in the Bacillaceae. These rhizosphere strains form a monophyletic cluster with Paenibacillus azotofixans, Paenibacillus polymyxa and Paenibacillus macerans. Two of them (RSA19 and TOD45) had previously been identified as Bacillus circulans (group 2) by phenotypic characterization (API 50CH). Evidence for nitrogen fixation by P. azotofixans, P. polymyxa, P. macerans and putative B. circulans strains RSA19 and TOD45 was provided by acetylene-reduction activity, and confirmed by amplifying and sequencing a nifH fragment (370 nt). The phylogenetic tree of nifH-derived amino acid sequences was compared to the phylogenetic tree of rrs sequences. All Paenibacillus nifH sequences formed a coherent cluster distinct from that of related nitrogen-fixing anaerobic clostridia and Gram-positive high-G+C-content frankiae. The nifH gene was neither detected in the B. circulans type strain (ATCC 4513T) nor in the type strains of Bacillus subtilis, Bacillus cereus, Bacillus alcalophilus, Bacillus simplex, Brevibacillus brevis and Paenibacillus validus. Accordingly, nitrogen fixation among aerobic endospore-forming Firmicutes seems to be restricted to a subset of species in the genus Paenibacillus.  (+info)

Evidence for involvement of gut-associated denitrifying bacteria in emission of nitrous oxide (N(2)O) by earthworms obtained from garden and forest soils. (2/323)

Earthworms (Aporrectodea caliginosa, Lumbricus rubellus, and Octolasion lacteum) obtained from nitrous oxide (N(2)O)-emitting garden soils emitted 0.14 to 0.87 nmol of N(2)O h(-1) g (fresh weight)(-1) under in vivo conditions. L. rubellus obtained from N(2)O-emitting forest soil also emitted N(2)O, which confirmed previous observations (G. R. Karsten and H. L. Drake, Appl. Environ. Microbiol. 63:1878-1882, 1997). In contrast, commercially obtained Lumbricus terrestris did not emit N(2)O; however, such worms emitted N(2)O when they were fed (i.e., preincubated in) garden soils. A. caliginosa, L. rubellus, and O. lacteum substantially increased the rates of N(2)O emission of garden soil columns and microcosms. Extrapolation of the data to in situ conditions indicated that N(2)O emission by earthworms accounted for approximately 33% of the N(2)O emitted by garden soils. In vivo emission of N(2)O by earthworms obtained from both garden and forest soils was greatly stimulated when worms were moistened with sterile solutions of nitrate or nitrite; in contrast, ammonium did not stimulate in vivo emission of N(2)O. In the presence of nitrate, acetylene increased the N(2)O emission rates of earthworms; in contrast, in the presence of nitrite, acetylene had little or no effect on emission of N(2)O. In vivo emission of N(2)O decreased by 80% when earthworms were preincubated in soil supplemented with streptomycin and tetracycline. On a fresh weight basis, the rates of N(2)O emission of dissected earthworm gut sections were substantially higher than the rates of N(2)O emission of dissected worms lacking gut sections, indicating that N(2)O production occurred in the gut rather than on the worm surface. In contrast to living earthworms and gut sections that produced N(2)O under oxic conditions (i.e., in the presence of air), fresh casts (feces) from N(2)O-emitting earthworms produced N(2)O only under anoxic conditions. Collectively, these results indicate that gut-associated denitrifying bacteria are responsible for the in vivo emission of N(2)O by earthworms and contribute to the N(2)O that is emitted from certain terrestrial ecosystems.  (+info)

Diversity in butane monooxygenases among butane-grown bacteria. (3/323)

Butane monooxygenases of butane-grown Pseudomonas butanovora, Mycobacterium vaccae JOB5, and an environmental isolate, CF8, were compared at the physiological level. The presence of butane monooxygenases in these bacteria was indicated by the following results. (i) O(2) was required for butane degradation. (ii) 1-Butanol was produced during butane degradation. (iii) Acetylene inhibited both butane oxidation and 1-butanol production. The responses to the known monooxygenase inactivator, ethylene, and inhibitor, allyl thiourea (ATU), discriminated butane degradation among the three bacteria. Ethylene irreversibly inactivated butane oxidation by P. butanovora but not by M. vaccae or CF8. In contrast, butane oxidation by only CF8 was strongly inhibited by ATU. In all three strains of butane-grown bacteria, specific polypeptides were labeled in the presence of [(14)C]acetylene. The [(14)C]acetylene labeling patterns were different among the three bacteria. Exposure of lactate-grown CF8 and P. butanovora and glucose-grown M. vaccae to butane induced butane oxidation activity as well as the specific acetylene-binding polypeptides. Ammonia was oxidized by all three bacteria. P. butanovora oxidized ammonia to hydroxylamine, while CF8 and M. vaccae produced nitrite. All three bacteria oxidized ethylene to ethylene oxide. Methane oxidation was not detected by any of the bacteria. The results indicate the presence of three distinct butane monooxygenases in butane-grown P. butanovora, M. vaccae, and CF8.  (+info)

Measurement of cardiac output during exercise by open-circuit acetylene uptake. (4/323)

Noninvasive measurement of cardiac output (QT) is problematic during heavy exercise. We report a new approach that avoids unpleasant rebreathing and resultant changes in alveolar PO(2) or PCO(2) by measuring short-term acetylene (C(2)H(2)) uptake by an open-circuit technique, with application of mass balance for the calculation of QT. The method assumes that alveolar and arterial C(2)H(2) pressures are the same, and we account for C(2)H(2) recirculation by extrapolating end-tidal C(2)H(2) back to breath 1 of the maneuver. We correct for incomplete gas mixing by using He in the inspired mixture. The maneuver involves switching the subject to air containing trace amounts of C(2)H(2) and He; ventilation and pressures of He, C(2)H(2), and CO(2) are measured continuously (the latter by mass spectrometer) for 20-25 breaths. Data from three subjects for whom multiple Fick O(2) measurements of QT were available showed that measurement of QT by the Fick method and by the C(2)H(2) technique was statistically similar from rest to 90% of maximal O(2) consumption (VO(2 max)). Data from 12 active women and 12 elite male athletes at rest and 90% of VO(2 max) fell on a single linear relationship, with O(2) consumption (VO(2)) predicting QT values of 9.13, 15.9, 22.6, and 29.4 l/min at VO(2) of 1, 2, 3, and 4 l/min. Mixed venous PO(2) predicted from C(2)H(2)-determined QT, measured VO(2), and arterial O(2) concentration was approximately 20-25 Torr at 90% of VO(2 max) during air breathing and 10-15 Torr during 13% O(2) breathing. This modification of previous gas uptake methods, to avoid rebreathing, produces reasonable data from rest to heavy exercise in normal subjects.  (+info)

Attributes of atmospheric carbon monoxide oxidation by Maine forest soils. (5/323)

CO, one of the most important trace gases, regulates tropospheric methane, hydroxyl radical, and ozone contents. Ten to 25% of the estimated global CO flux may be consumed by soils annually. Depth profiles for (14)CO oxidation and CO concentration indicated that CO oxidation occurred primarily in surface soils and that photooxidation of soil organic matter did not necessarily contribute significantly to CO fluxes. Kinetic analyses revealed that the apparent K(m) was about 18 nM (17 ppm) and the V(max) was 6.9 micromol g (fresh weight)(-1) h(-1); the apparent K(m) was similar to the apparent K(m) for atmospheric methane consumption, but the V(max) was more than 100 times higher. Atmospheric CO oxidation responded sensitively to soil water regimes; decreases in water content in initially saturated soils resulted in increased uptake, and optimum uptake occurred at water contents of 30 to 60%. However, extended drying led to decreased uptake and net CO production. Rewetting could restore CO uptake, albeit with a pronounced hysteresis. The responses to changing temperatures indicated that the optimum temperature for net uptake was between 20 and 25 degrees C and that there was a transition to net production at temperatures above 30 degrees C. The responses to methyl fluoride and acetylene indicated that populations other than ammonia oxidizers and methanotrophs must be involved in forest soils. The response to acetylene was notable, since the strong initial inhibition was reversed after 12 h of incubation; in contrast, methyl fluoride did not have an inhibitory effect. Ammonium did not inhibit CO uptake; the level of nitrite inhibition was initially substantial, but nitrite inhibition was reversible over time. Nitrite inhibition appeared to occur through indirect effects based on abiological formation of NO.  (+info)

Noninvasive cardiac output measurement in orthostasis: pulse contour analysis compared with acetylene rebreathing. (6/323)

We tested the reliability of noninvasive cardiac output (CO) measurement in different body positions by pulse contour analysis (CO(pc)) by using a transmission line model (K. H. Wesseling, B. De Wit, J. A. P. Weber, and N. T. Smith. Adv. Cardiol. Phys. 5, Suppl. II: 16-52, 1983). Acetylene rebreathing (CO(rebr)) was used as a reference method. Twelve subjects (age 21-34 yr) were studied: 1) six in whom CO(rebr) and CO(pc) were measured in the standing and 6 degrees head-down tilt (HDT) postures and 2) six in whom CO was measured in the 30 degrees HDT, supine, 30 degrees head up-tilt (HUT), and 70 degrees HUT postures on a tilt table. The CO(rebr)-to-CO(pc) ratio in (near) the supine position during rebreathing was used as the calibration factor for CO(pc) measurements. Calibrated CO(pc) (CO(cal sup)) consistently overestimated CO in the upright posture. The drop in CO with upright posture was underestimated by approximately 50%. CO(cal sup) and CO(rebr) values did not differ in the 30 degrees HDT position. Changes in the CO(rebr)-to-CO(pc) ratio are highly variable among subjects in response to a change in posture. Therefore, CO(pc) must be recalibrated for each subject in each posture.  (+info)

Two forms of nitrogenase from the photosynthetic bacterium Rhodospirillum rubrum. (7/323)

Acetylene reduction by nitrogenase from Rhodospirillum rubrum, unlike that by other nitrogenases, was recently found by other investigators to require an activation of the iron protein of nitrogenase by an activating system comprising a chromatophore membrane component, adenosine 5'-triphosphate (ATP), and divalent metal ions. In an extension of this work, we observed that the same activating system was also required for nitrogenase-linked H(2) evolution. However, we found that, depending on their nitrogen nutrition regime, R. rubrum cells produced two forms of nitrogenase that differed in their Fe protein components. Cells whose nitrogen supply was totally exhausted before harvest yielded predominantly a form of nitrogenase (A) whose enzymatic activity was not governed by the activating system, whereas cells supplied up to harvest time with N(2) or glutamate yielded predominantly a form of nitrogenase (R) whose enzymatic activity was regulated by the activating system. An unexpected finding was the rapid (less than 10 min in some cases) intracellular conversion of nitrogenase A to nitrogenase R brought about by the addition to nitrogen-starved cells of glutamine, asparagine, or, particularly, ammonia. This finding suggests that mechanisms other than de novo protein synthesis were involved in the conversion of nitrogenase A to the R form. The molecular weights of the Fe protein and Mo-Fe protein components from nitrogenases A and R were the same. However, nitrogenase A appeared to be larger in size, because it had more Fe protein units per Mo-Fe protein than did nitrogenase R. A distinguishing property of the Fe protein from nitrogenase R was its ATP requirement. When combined with the Mo-Fe protein (from either nitrogenase A or nitrogenase R), the R form of Fe protein required a lower ATP concentration but bound or utilized more ATP molecules during acetylene reduction than did the A form of Fe protein. No differences between the Fe proteins from the two forms of nitrogenase were found in the electron paramagnetic resonance spectrum, midpoint oxidation-reduction potential, or sensitivity to iron chelators.  (+info)

Measurement in vivo of hydrogenase-catalysed hydrogen evolution in the presence of nitrogenase enzyme in cyanobacteria. (8/323)

A method was devised that allows measurement in vivo of hydrogenase-catalysed H2 evolution from the cyanobacterium Anabaena cylindrica, independent of nitrogenase activity, which is also present. Addition of low concentrations of reduced Methyl Viologen (1-10mM) to intact heterocystous filaments of the organism resulted in H2 evolution, but produced conditions giving total inhibition of nitrogenase (acetylene-reducing and H2-evolving) activity. That the H2 formed under these conditions was not contributed to by nitrogenase was also supported by the observation that its rate of formation was similar in the dark or with Ar replaced by N2 in the gas phase, and also in view of the pattern of H2 evolution at very low Methyl Viologen concentrations. Conclusive evidence that the H2 formed in the presence of Methyl Viologen was solely hydrogenase-mediated was its evolution even from nitrogenase-free (non-heterocystous) cultures; by contrast 'uptake' hydrogenase activity in such cultures was greatly decreased. The hydrogenase activity was inhibited by CO and little affected by acetylene. Finally the hydrogenase activity was shown to be relatively constant at different stages during the batch growth of the organism, as opposed to nitrogenase activity, which varied.  (+info)

TY - JOUR. T1 - Coordination and adsorption of acetylene in the poly[(vinylcyclopentadienyl)manganese] membrane. AU - Kawakami, Hiroyoshi. AU - Tsuda, Kenji. AU - Nishide, Hiroyuki. AU - Tsuchida, Eishun. PY - 1991/1/1. Y1 - 1991/1/1. N2 - A copolymer of (vinylcyclopentadienyl)dicarbonylmanganese (CpMn) and octyl methacrylate forms its acetylene-coordinated complex reversibly and stably in the solvent-free membrane state. Kinetic and equilibrium constants of the acetylene coordination to the CpMn residue in the copolymer membrane are determined spectroscopically in situ. The acetylene coordination parameters are much smaller than those of the corresponding nitrogen coordination. Acetylene transport for the membrane is expected to be selectively augmented due to the coordination of acetylene to the fixed CpMn. However, acetylene transport behavior is in accordance with total immobilization of acetylene on the CpMn residue in the acetylene permeation through the membrane.. AB - A copolymer of ...
TY - JOUR. T1 - Coordination and adsorption of acetylene in the poly[(vinylcyclopentadienyl)manganese] membrane. AU - Kawakami, Hiroyoshi. AU - Tsuda, Kenji. AU - Nishide, Hiroyuki. AU - Tsuchida, Eishun. PY - 1991/1/1. Y1 - 1991/1/1. N2 - A copolymer of (vinylcyclopentadienyl)dicarbonylmanganese (CpMn) and octyl methacrylate forms its acetylene-coordinated complex reversibly and stably in the solvent-free membrane state. Kinetic and equilibrium constants of the acetylene coordination to the CpMn residue in the copolymer membrane are determined spectroscopically in situ. The acetylene coordination parameters are much smaller than those of the corresponding nitrogen coordination. Acetylene transport for the membrane is expected to be selectively augmented due to the coordination of acetylene to the fixed CpMn. However, acetylene transport behavior is in accordance with total immobilization of acetylene on the CpMn residue in the acetylene permeation through the membrane.. AB - A copolymer of ...
Shifts in the electronic transitions for the complexes of phenylacetylene with ammonia, methylamine, and triethylamine clearly indicate the variation in the intermolecular structures of the three complexes. The infrared spectrum of phenylacetylene in the, acetylenic C-H stretching region shows Fermi resonance bands, which act as a sensitive tool to probe the intermolecular structures. The IR-UV double resonance spectra of the three complexes are disparate and signify the formation of distinct structures. The formation of C-H center dot center dot center dot N hydrogen-bonded complex with ammonia and two distinct types of c complexes with methylamine and triethylamine can be inferred from the analysis of electronic and vibrational spectra in combination with ab initio calculations. These complexes clearly point out the fact that marginal changes in the interacting partner can significantly alter the intermolecular structure ...
Professional HVAC Oxygen Acetylene Oxy Welding Cutting Torch Kit W/Gas Tank. Professional Portable Oxygen Acetylene Oxy Welding Cutting Torch Kit W/Gas Tank, Torch Cutting and Welding Portable Kit. Welding & Cutting Torch Kit Oxygen Acetylene With Portable Tote and Tanks. Complete gas-welding accessory kit includes a 4 liter oxygen tank and 2 liter acetylene tank with regulators, along with full brass torch assembly. Use this oxyacetylene torch for welding pipes and tubes, and other metal repair work. Its also used to fabricate metal artwork.. Use it for iron or steel welding, plus brazing, braze-welding, cutting, bending and forming. Welding & Cutting Torch Kit Oxygen Acetylene With Portable Tote and Oxy Acty Tanks. Extremely Popular for General Maintenance Work, Metal Sculpture, Automotive Repair, Air Conditioning, Refrigeration etc. Light to Medium Duty Portable Outfit. Waterproof Storage Compartment for Small Items. Rear entry regulators for better balance on the small cylinders. Material: ...
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TY - JOUR. T1 - Electronic Selectivity Tuning in Titanium(III)-Catalyzed Acetylene Cross-Dimerization Reactions. AU - Oshovsky, Gennady V.. AU - Hessen, Bart. AU - Reek, Joost N. H.. AU - de Bruin, Bas. PY - 2011/11/28. Y1 - 2011/11/28. N2 - The reactivity of open-shell titanium(III) complexes in organometallic catalysis is associated with many open questions, in particular regarding the electronic structure of catalytic intermediates and transition states. The unpaired electron density in principle allows for radical-type reactivity, while at the same time empty d orbitals allow more traditional cis-coordination insertion pathways. In this paper we investigated the (Cp*)(2)Ti-III-catalyzed cross-dimerization of aliphatic and aromatic acetylenes, focusing on the reactivity of two different aliphatic acetylenes with a series of different aromatic acetylenes. The applied aliphatic acetylenes 1a (4-methylpent-1-yne) and 1b (N,N-dimethyl-N-propargylamine) have the same size but different ...
Looking for acetylenes? Find out information about acetylenes. or , HC≡CH, a colorless gas. It melts at −80.8°C; and boils at −84.0°C;. Offensive odors often noted in commercial acetylene are due to impurities.... Explanation of acetylenes
Fingerprint Dive into the research topics of Palladium-Catalyzed Addition and Carbonylative Addition of Diaryl Disulfides and Diselenides to Terminal Acetylenes. Together they form a unique fingerprint. ...
TY - JOUR. T1 - Measurement of cardiac output during exercise by open-circuit acetylene uptake. AU - Barker, Rebecca C.. AU - Hopkins, Susan R.. AU - Kellogg, Nancy. AU - Olfert, I. Mark. AU - Brutsaert, Tom D. AU - Gavin, Timothy P.. AU - Entin, Pauline L.. AU - Rice, Anthony J.. AU - Wagner, Peter D.. PY - 1999/10. Y1 - 1999/10. N2 - Noninvasive measurement of cardiac output (Q̇T) is problematic during heavy exercise. We report a new approach that avoids unpleasant rebreathing and resultant changes in alveolar PO2 or PCO2 by measuring short-term acetylene (C2H2) uptake by an open-circuit technique, with application of mass balance for the calculation of Q̇T. The method assumes that alveolar and arterial C2H2 pressures are the same, and we account for C2H2 recirculation by extrapolating end-tidal C2H2 back to breath 1 of the maneuver. We correct for incomplete gas mixing by using He in the inspired mixture. The maneuver involves switching the subject to air containing trace amounts of C2H2 ...
The increasing threats of global warming, rapid depletion of fossil fuels, and increasing energy demands are driving an enormous amount of research into clean renewable sources of energy, flue gas capture technologies, and environmentally friendly energy storage devices, to name a few. Activated carbons present a multipurpose material commonly used in many of these increasingly popular green technologies. A wide range of cross-linked acetylenic polymers of phenylacetylene and 1,3- diethynylbenzene were synthesized and investigated in this thesis to generate materials for electrochemical double layer capacitors, CO2 capture, and hydrogen storage. Chemical activation of the copolymers in the presence of KOH was shown to produce highly microporous carbons with various textural properties. The specific cross-linking densities of the polymer precursors prior to carbonization were shown to greatly affect the carbon yield, surface area, pore volumes and pore sizes of the carbons produced. ...
Acetylene is not especially toxic, but when generated from calcium carbide, it can contain toxic impurities such as traces of phosphine and arsine, which give it a distinct garlic-like smell. It is also highly flammable, as are most light hydrocarbons, hence its use in welding. Its most singular hazard is associated with its intrinsic instability, especially when it is pressurized: under certain conditions acetylene can react in an exothermic addition-type reaction to form a number of products, typically benzene and/or vinylacetylene, possibly in addition to carbon and hydrogen.[citation needed] Consequently, acetylene, if initiated by intense heat or a shockwave, can decompose explosively if the absolute pressure of the gas exceeds about 200 kilopascals (29 psi). Most regulators and pressure gauges on equipment report gauge pressure, and the safe limit for acetylene therefore is 101 kPagage, or 15 psig.[42][43] It is therefore supplied and stored dissolved in acetone or dimethylformamide ...
TY - JOUR. T1 - Synthesis of new vinylsilanes containing an asymmetric silicon via platinum catalyzed hydrosilylation of acetylene and monosubstituted alkynes. AU - Gevorgyan, Vladimir. AU - Borisova, Larisa. AU - Popelis, Juris. AU - Lukevics, Edmunds. AU - Foltynowicz, Zenon. AU - Gulinski, Jacek. AU - Marciniec, Bogdan. PY - 1992/2/4. Y1 - 1992/2/4. N2 - A series of new racemic vinylsilanes has been obtained by hydrosilylation reaction of acetylene and monosubstituted alkynes with (±)-α-NpPhMeSiH and (±)-N(CH2CH2O)3SiCH2PhMeSiH in the presence of platinum-containing catalysts.. AB - A series of new racemic vinylsilanes has been obtained by hydrosilylation reaction of acetylene and monosubstituted alkynes with (±)-α-NpPhMeSiH and (±)-N(CH2CH2O)3SiCH2PhMeSiH in the presence of platinum-containing catalysts.. UR - http://www.scopus.com/inward/record.url?scp=0002291907&partnerID=8YFLogxK. UR - http://www.scopus.com/inward/citedby.url?scp=0002291907&partnerID=8YFLogxK. U2 - ...
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This paper demonstrates an acetylene gas sensor based on an Ag-decorated tin dioxide/reduced graphene oxide (Ag-SnO2/rGO) nanocomposite film, prepared by layer-by-layer (LbL) self-assembly technology. The as-prepared Ag-SnO2/rGO nanocomposite was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Raman spectrum. The acetylene sensing properties were investigated using different working temperatures and gas concentrations. An optimal temperature of 90 °C was determined, and the Ag-SnO2/rGO nanocomposite sensor exhibited excellent sensing behaviors towards acetylene, in terms of response, repeatability, stability and response/recovery characteristics, which were superior to the pure SnO2 and SnO2/rGO film sensors. The sensing mechanism of the Ag-SnO2/rGO sensor was attributed to the synergistic effect of the ternary nanomaterials, and the heterojunctions created at the interfaces between SnO2 and rGO. This work indicates that the Ag
A nitrogen-fixing bacterium, designated strain 6H33bT, was isolated from a compost pile in Japan. The nitrogenase activity of this strain was detected based on its acetylene-reducing activity under low oxygen concentrations (2-4 %). An analysis of the genes responsible for nitrogen fixation in this strain, nifH and nifD, indicated a close relationship to those of Pseudomonas stutzeri A15 (A1501). Sequence similarity searches based on the 16S rRNA gene sequences showed that strain 6H33bT belongs within the genus Pseudomonas sensu stricto; closest similarity was with Pseudomonas indica (97·3 %). A comparison of several taxonomic characteristics of 6H33bT with those of P. indica and some type strains of the genus Pseudomonas sensu stricto indicated that 6H33bT could be distinguished from P. indica based on the presence of nitrogen fixation ability, the absence of nitrate reduction and denitrification abilities and the utilization of some sugars and organic acids. Phylogenetic analyses and the results of
article{2da3f822-7032-422c-900e-e4a29654ecd9, abstract = {,p,Pure rotational coherent anti-Stokes Raman scattering (CARS) experiments have been performed in acetylene for temperatures ranging from 294 to 582 K, and in mixtures of acetylene and nitrogen in the mole fraction range of 0.06-0.32 for acetylene at room temperature. The experimental spectra are evaluated by a least-square fitting to libraries of theoretically calculated spectra using two different Raman linewidth models, one with and one without dependence on the rotational quantum number J. It is found that a J-dependent model is favourable, both regarding temperature measurements in pure acetylene, and simultaneous acetylene concentration and temperature measurements in different mixtures of acetylene and nitrogen. For the temperature measurements performed in pure acetylene the temperature inaccuracy is generally less than 2% when the J-dependent model for the Raman linewidths is used. It is found that fitting the value of the ...
Course 1 and 2, Version 1: Upon successful completion of the course, students will be able to: set up and test oxygen and acetylene cylinders and accessory equipment; perform basic cutting; cut freehand, guide and bevel; identify all safety regulations for cutting and welding; identify common causes and types of boiler tube failure; and perform tube repairs and tube rolling procedures. Course 1 and 2: Version 2 and Course 1 and 2: Version 3: Same as Version 1; in addition: demonstrate proper transporation and securement methods for oxygen and acetylene cylinders; demonstrate inspection requirements for oxygen and acetylene; state the normal pressure for oxygen and acetylene cylinders; describe the construction of oxygen and acetylene cylinders; identify the parts of oxygen and acetylene regulators; describe the function and operation of fusible plugs in acetylene cylinders and safety discs in oxygen cylinders; select the appropriate cutting tip for the application; demonstrate how to adjust ...
B.4.3.3.5 Physisorption and Desorption of Nonsolvent Molecules. Since there is one acetylene molecule for every ~59 n-octane molecules in the hydrocarbon feedstock solution, the possible physisorption of solvated acetylene molecules from the external solvent bath to the piston cavity passivated diamond walls must also be evaluated. Experiments [3189] on the physisorption of acetylene on the diamond C(111)-H(1x1) surface from gas phase show that the C2H2 molecule adsorbs nearly flat on terraces but is slightly tilted on defect sites, covering four surface hydrogens. This in-plane orientation of the acetylene monolayer is not unexpected because C2H2 has high p electron density around the C=C triple bond, the most energetically favorable position to be attacked by hydrogen-containing species to form a hydrogen bond, and because electrostatic interactions also favor the horizontal orientation of C2H2 on the diamond surface.. Will n-octane or acetylene be preferentially adsorbed on the passivated ...
Acetylene is a weak acid, but not nearly as weak as alkanes or alkenes. CompoundpK a HF3.2 H 2 O16 NH CH 4 60 H2CH2CH2CH2C CH 2 HCCH 26 Acetylene
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The report generally describes 1-phenyl-2-(trimethylsilyl)-acetylene, examines its uses, production methods, patents. 1-Phenyl-2-(trimethylsilyl)-acetylene
acetylene - Meaning in Bengali, what is meaning of common in Bengali dictionary, audio pronunciation, synonyms and definitions of common in Bengali and English.
Team WashU_StLouis The production of a bio-fertilizer could benefit the agricultural industry by decreasing the need for energy intensive nitrogen fixation processes. The nif cluster of Cyanothece 51142 consists of 29 genes that construct and regulate a nitrogenase protein complex, which catalyzes the fixation of atmospheric nitrogen. This year, our iGEM team aims to harness the power of nif to produce ammonia in Escherichia coli. After synthesizing a nif- containing plasmid (34 kbp) using the DNA assembler method (Shao et al 2009) and transforming that plasmid into E. coli, our team tested for nitrogenase activity using the acetylene reduction assay. The transformed E. coli were then compared to wild-type under limited nitrogen conditions to check for a competitive advantage. Future tests will evaluate the expression of various nitrogenase subunits, such as nifD and nifK. Our team also aims to further characterize the promoter sequences of the Cyanothece 51142 nif cluster. Between the cysE and ...
Sampling days in the field have been long yet extremely productive. We have collected nitrogen fixation data on primary producers found in four streams with varying temperatures. We can calculate the rate that primary producers are fixing nitrogen using a technique called Acetylene Reduction Assay or ARA. This is one method of measuring fixation which allows us to compare how rates of fixation change across a temperature gradient. You may be thinking Whoa! Back up. What is this girl talking about? Let me explain. Some primary producers, for example, one of my favorites, Nostoc Pink, can take nitrogen gas (N2), which is abundant in the air, and utilize the nitrogen for growth and other critical cellular processes. But for the organism to use the nitrogen from N2 gas, it must be converted into a usable form of nitrogen. One particular enzyme known as nitrogenase allows for some organisms to be able to do just that! This enzyme breaks the bonds in N2 gas, or as we call it, fixes N2 gas, and ...
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A crossed beam investigation of the reactions of tricarbon molecules, C(3)(X(1)Sigma(+)(g)),with acetylene, C(2)H(2)(X(1)Sigma(+)(g)), ethylene, C(2)H(4)(X(1)A(g)), and benzene, C(6)H(6)(X(1)A(1g)) Article ...
An aqueous slurry composition which is curable at saturated steam pressure and temperature of 360.degree. to 400.degree. F to form a hard porous mass suitable for containing dissolved acetylene gas solutions, comprising lime, crystalline silica, and a thickening agent selected from the group consisting of (a) polyethylene oxide, (b) amorphous glassy silica, (c) a soluble salt of phosphate and a soluble salt of calcium and (d) a soluble salt of phosphate and a neutralizing acid.
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The balanced equation for the combustion of acetylene is 2 H2C2 + 5 O2 ? 4 CO2 + 2 H2O. A combustion reaction occurs when a compound merges with oxygen to release heat in an exothermic...
Page contains details about sodium carboxymethylcellulose-bound urchin-like CoSe2/acetylene black . It has composition images, properties, Characterization methods, synthesis, applications and reference articles : nano.nature.com
Reports emphasize significant developments in process technology for Acetylene that have potential implications for the chemical and energy industries
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GEL COLLOIDAL .........................252/315.1+ MISC CHEMICAL MANUFACTURE ........156/DIG.108 RADIOACTIVE .......................252/634 SILICA ............................423/334+ GEL ROUTE TO GLASS MAKING ........... 501/12 GELATINE ............................ 530/354 JELLIES ...........................426/576 GEMS ................................ 63/32 ARTIFICIAL ........................501/86 CHANGING COLOR BY RADIATION .......378/38 DESIGN ............................D11/89+ SETTING METHODS AND APPARATUS .....29/10 SETTINGS ..........................63/26+ GENEALOGICAL CHARTS TEACHING ..........................434/154+ GENERATOR MOTOR ..................... 310/113 GENERATORS (SEE STEAM, GENERATORS) .. D13/112 ACETYLENE .........................48/1 ACETYLENE .........................48/2 ACETYLENE .........................48/3.R ACETYLENE .........................48/4+ CHEMICAL ..........................422/198+ CHEMICAL PRESSURE IN FIRE EXTINGUISHER ...................169/6+ COMBUSTIBLE ...
Calcium carbide (CaC2) reacts with water to form acetylene (C2H2) gas and calcium hydroxide (Ca(OH)2). If the ΔH for: CaC2(s) + 2H2O(l) = Ca(OH)2(s) + C2H2(g) is -127 kJ, then what is the enthalpy of formation for calcium carbide ...
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Follow these practical tips and guidelines to mitigate or eliminate the risk of injury to themselves or others when transporting and handling acetylene.
A common use of ethyne, also called acetylene, is as a fuel in welding. An acetylene flame can reach temperatures of close to 6,000 degrees Fahrenheit. Acetylene is also used for making carbon...
Marcelo Godoi, Eduardo W. Ricardo, Tiago E. Frizon, Manuela S.T. Rocha, Devender Singh, Márcio W. Paixão, Antonio Luiz Braga, An efficient synthesis of alkynyl selenides and tellurides from terminal acetylenes and diorganyl diselenides or ditellurides catalyzed by recyclable copper oxide nanopowder, Tetrahedron, 2012, 68, 51, ...
The catalytic performance of triazolyl-based molecular gels was investigated in the Huisgen 1,3-dipolar cycloaddition of alkynes and azides. Low-molecular-weight gelators derived from l-valine were synthesized and functionalized with a triazole fragment. The resultant compounds formed gels either with or without copper, in a variety of solvents of different polarity. The gelators coordinated CuI and exhibited a high catalytic activity in the gel phase for the model reaction between phenylacetylene and benzylazide. Additionally, the gels were able to participate in autocatalytic synthesis and the influence of small structural changes on their performance was observed. [-] ...
Two distinct isomers for the binary complex between phenylacetylene and methylamine were observed. The first complex is characterized by the presence of a C-H center dot center dot center dot N hydrogen bond between the acetylenic C-H group and the N atom of methylamine. In the second complex the N-H group of methylamine interacts with the pi electron density of the benzene ring accompanied by a peripheral interaction between the methyl C-H group and the pi electron density of the C C bond. Stabilization energies and Gibbs free energies at the complete basis set (CBS) limit of the coupled cluster theory with single, double, and perturbative triple excitations [CCSD(T)] suggest that while the C-H center dot center dot center dot N hydrogen bonded complex is the global minimum, the N-H center dot center dot center dot pi hydrogen bonded complex is a high energy local minimum. The formation of the N-H center dot center dot center dot pi complex could be related to kinetic trapping or higher ...
IspH owes its flexibility to the structure and location of its active site. The enzyme is composed of three structural units that harbor a cubic iron-sulfur cluster at their center. This unusual structure enables the enzyme to accomplish a challenging reaction: converting an allyl alcohol to a mixture of the two isoprene components. While iron-sulfur proteins normally act as electron transmitters (deoxidation and oxidation respectively), the IspH enzyme binds the substrate directly to the iron-sulfur cluster. Basis for industrial applications Apart from acetylene hydratase and nitrogenase, IspH is just the third enzyme known to convert acetylene compounds. In addition, until now there were no known iron-containing catalysts that could carry out this reaction. Thus the newly discovered property of IspH could enable the development of new active pharmaceutical ingredients, particularly for the battle against malaria and tuberculosis ...
An organic compound with the formula C2H2 or HCCH. The first member of the alkynes, acetylene is a gas with a narrow liquid range; the triple point is −81°C (−114°F). The heat of formation (ΔH°f ) is +227 kilojoules/mole, and acetylene is the most ...
TY - JOUR. T1 - Short exposure to acetylene to distinguish between nitrifier and denitrifier nitrous oxide production in soil and sediment samples. AU - Kester, R.A.. AU - De Boer, W.. AU - Laanbroek, H.J.. N1 - Reporting year: 1996 Metis note: 2141; CTE; TME ; ME file:///L:/Endnotedatabases/NIOOPUB/pdfs/Pdfs1996/Kester_ea_2141.pdf. PY - 1996. Y1 - 1996. N2 - The contribution of nitrifiers and denitrifiers to the nitrous oxide production in slurries of calcareous silt loam and river bank sediment at different oxygen concentrations was determined using acetylene as nitrification inhibitor. The addition of 10 Pa acetylene resulted in inhibition of nitrous oxide production at oxic conditions, but strongly enhanced the nitrous oxide production at oxygen-poor and anoxic conditions. Inhibition of nitrification by short exposure (1 to 24 h) to high concentrations of acetylene (100 Pa to 10 kPa) was tested using the same samples. After the removal of acetylene, nitrification was inhibited almost ...
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TY - JOUR. T1 - Nanostructure and high-rate discharge-charge property of manganese oxide/acetylene black nanocomposite synthesized by sonochemical method. AU - Kawaoka, Hirokazu. AU - Hibino, Mitsuhiro. AU - Zhou, Haoshen. AU - Honma, Itaru. PY - 2005/2/14. Y1 - 2005/2/14. N2 - Nanostructure and high-rate discharge-charge capacities were investigated for the manganese oxide/acetylene black (AB) nanocomposites fabricated by sonication from aqueous solutions containing permanganate ion. Coating structure in which the acetylene black particles were uniformly coated with manganese oxide was successfully prepared from a pH=10 solution. On the other hand, acicular and tabular birnessite crystals were observed in samples obtained from pH,1 solutions, although the formation rate of manganese oxide in the pH,1 solution was much faster than that in the pH=10 solution. The sample from the pH=10 solution could be discharged and charged under high current density, such as 10 A g -1, because of the unique ...
BIS(TRIMETHYLSTANNYL)ACETYLENE 2117-50-2 safety info, BIS(TRIMETHYLSTANNYL)ACETYLENE chemical safety search, Chemical BIS(TRIMETHYLSTANNYL)ACETYLENE safety technical specifications ect.
This has some implications in the properties and chemical reactivity of sigma and pi bonds. Ethyne or acetylene, HC=CH, is the simplest alkyne example. The process for understanding the sp hybridization process for carbon is basically an extension of the other two types (sp 3 and sp 2). Thus, in acetylene (ethyne), there are two unhybridized orbitals, which, by convention are and (see figure below): Figure: Illustrating the sp orbitals. The triple bonded carbon atoms of acetylene aresp hybridized. The sigma bond is short and strong. E)An alkyne reacts as an electrophile,and is therefore electron poor. Type of â ¦ You should try to work out this scheme on your own and see if your predictions agree with those presented in the textbook. is related to Unsaturated Hydrocarbons Quiz. The Structure of Ethyne (Acetylene): sp Hybridization ** Hydrocarbons in which two carbon atoms share three pairs of electrons between them, and are thus bonded by a triple bond, are called alkynes. Correspondingly, ...
Complexes of dibenzo-18-crown-6 (DB18C6, host) with water, ammonia, methanol, and acetylene (guest), formed in supersonic jets, have been characterized by using various spectroscopic methods: laser induced fluorescence (LIF), UV-UV hole-buning (UV-UV HB), and IR-UV double resonance (IR-UV DR) spectroscopy. Firstly, we reinvestigated the conformations of bare DB18C6 (species m1 and m2) and the structure of DB18C6-H2O (species a) [R. Kusaka, Y. Inokuchi, T. Ebata, Phys. Chem. Chem. Phys., 2008, 10, 6238] by measuring the IR-UV DR spectra in the region of the methylene CH stretching vibrations. From the IR-UV DR spectra, it was found that the IR spectral feature of the methylene CH stretch of DB18C6-H2O is clearly different from those of bare DB18C6 conformers, suggesting that DB18C6 changes its conformation when it forms the complex with a water molecule. With the aid of Monte Carlo simulation for extensive conformational search and density functional calculations (at B3LYP and M05-2X/6-31+G* ...
The Au(III) complex Au(tpy)(OAcF)2 (OAcF = OCOCF3; tpy = 2-(p-tolyl)pyridine) catalyzes the anti addition of trifluoroacetic acid (HOAcF) to acetylene to furnish vinyl trifluoroacetate. The Au(III) vinyl complex Au(tpy)(OAcF)(CH═CHOAcF) (vinyl group bonded trans to tpy-N) is formed during the early stage of the reaction. The vinyl complex, which has been isolated and structurally characterized, resists protolytic cleavage of the vinyl group, and therefore catalysis does not proceed by a simple formal insertion (i.e., coordination-nucleophilic attack-protolysis at the site trans to tpy-N) mechanism. Experimental evidence, including isotopic labeling, rather suggests that a double-insertion process is operative. The unobserved Au(III) divinyl complex Au(tpy)(CH═CHOAcF)2 is a crucial intermediate for which the true catalytic activity, comprising a coordination-nucleophilic attack-protolysis sequence, occurs at the site trans to tpy-C. The overall mechanism is in full agreement with DFT ...
This paper presents the adsorption properties of the o-Al13Co4(100) surface toward molecules involved in the semihydrogenation of acetylene. The energetically favored adsorption sites of H, C2H2, C2H3, and C2H4 are determined thanks to ab initio density functional calculations. The surface model used for this study has been determined previously [Phys. Rev. B 2011, 84, 085411], using an approach combining both experimental observations and density functional theory calculations. We show that although the surface termination layer of o-Al13Co4(100) is a dense Al-rich layer, its adsorption properties are quite different from pure elemental Al surfaces, especially for atomic hydrogen adsorption (exothermic on o-Al13Co4(100) and endothermic on low index Al surfaces). The role of surface and subsurface cobalt atoms is investigated carefully. The electronic donor/acceptor character of subsurface cobalt atoms is shown to influence the adsorption properties. In particular, the subsurface cobalt atoms have a
Synthesis routes of novel piperidine-containing acetylenes are presented. The new molecules are expected to exhibit plant growth stimulation properties. In particular, the yield in a situation of drought is expected to increase. Our synthesis makes use of the Favorskii reaction between cyclohexanone/piperidone and triple-bond containing alcohols. The structures of the obtained molecules were determined using nuclear magnetic resonance (NMR). The electronic structure and geometries of the molecules were studied theoretically using first-principles calculations based on density functional theory. The calculated geometries agree very well with the experimentally determined ones, and also allow us to determine bond lengths, angles and charge distributions inside the molecules.. ...
The catalytic hydrogenation of acetylene by liquid-supported nickel catalyst with special reference to the selective formation of ethylene ...
TY - JOUR. T1 - New Reaction of Iodine with Sterically Hindered Acetylene, 1,2,4,5-Tetramethyl-3,6-bis(phenylethynyl)benzene in Dimethyl Sulfoxide. AU - Yusubov, M. S.. AU - Zholobova, G. A.. AU - Vasileva, V. P.. AU - Habicher, W.. AU - Filimonov, V. D.. PY - 1996/8. Y1 - 1996/8. UR - http://www.scopus.com/inward/record.url?scp=0030337418&partnerID=8YFLogxK. UR - http://www.scopus.com/inward/citedby.url?scp=0030337418&partnerID=8YFLogxK. M3 - Article. AN - SCOPUS:0030337418. VL - 32. SP - 1233. EP - 1234. JO - Russian Journal of Organic Chemistry. JF - Russian Journal of Organic Chemistry. SN - 1070-4280. IS - 8. ER - ...
Two new papers based on data from NASAs Cassini spacecraft scrutinize the complex chemical activity on the surface of Saturns moon Titan.
This regiospecific procedure consisted of a Pd domino indolization involving a consecutive Pd-catalyzed Sonogashira coupling followed by aminopalladation and reductive elimination starting from 2-iodo-N-trifluoroacetylanilide 1, a suitable acetylene 2 and bromoarene 3. The Senanayake group optimized the reaction conditions as shown in Scheme 1: the use of trifluoroacetyl as protecting group in 1 was shown to be advantageous (readily hydrolyzable); addition of bromobenzene at the beginning simplified the procedure and enhanced the reaction rate; DMF as solvent combined with K2CO3 as base, and a temperature of 60 C gave better results.. The Larock group of the Iowa State University reported (J. Org. Chem. 2006, 71, 62. ) on the synthesis of 3-iodoindoles 8 via Pd/Cu-catalyzed coupling of N,N-dialkyl-2-iodoanilines 5 with terminal acetylenes 6 and subsequent electrophilic cyclization of 7 (Scheme 2). Due to the high reactivity of N,N-dialkyl-o-iodoanilines towards the Sonogashira coupling, a wide ...
The NO turnover in soils was measured in two different experimental set-ups, a flow-through system, which is very time-consuming and needs rather sophisticated equipment, and a closed system using serum bottles. We compared the NO turnover parameters (NO consumption rate constant, NO production rate, NO compensation concentration) that were measured with both systems in different soils, under different conditions and in the presence of 10 Pa acetylene to inhibit nitrification. The values of the NO turnover parameters that were measured with the two systems under oxic conditions were usually comparable. The addition of acetylene did not affect the NO consumption rate constants of the soils with the exception of soil G1. However, the NO production rates and the NO compensation concentrations decreased significantly in the presence of acetylene, indicating that nitrification was the main source of NO in these soils. Only one soil (Bol) showed no nitrifying activity. Increasing soil moisture content ...
Nitroaromatic hydroxy substituted acetylene compounds wherein both the nitro and acetylene groups are directly connected to aromatic ring carbon atoms are hydrogenated in an inert solvent to selectively reduce the nitro function over a ruthenium disulfide catalyst. Of particular interest is the preparation of aminophenylacetylene from nitrophenyl hydroxy substituted acetylene.
TY - JOUR. T1 - A molecular porous zirconium-organic material exhibiting highly selective CO2 adsorption, high thermal stability, reversible hydration, facile ligand exchange and exclusive dimerization of phenylacetylene. AU - Lee, Nam Hee. AU - Lee, Dong Woo. AU - Yeo, Hakmin. AU - Kwak, Kyungwon. AU - Chun, Hyang Sook. AU - Ok, Kang Min. PY - 2014/7/7. Y1 - 2014/7/7. N2 - A new molecular porous zirconium-organic material, Zr{[NC5H 3(CO2)2]2(OH2) 2}·1.3H2O (CAUMOF-12) has been synthesized by a hydrothermal reaction using Zr(NO3)4, 2,6-NC 5H3(CO2H)2, HNO3 and water at 180 °C. Single-crystal X-ray diffraction was used to determine the crystal structure of the reported material. Although the material can be classified as a molecular compound, CAUMOF-12 exhibits a pseudo-three- dimensional open-framework structure with void spaces obtained by intermolecular hydrogen bonds. CAUMOF-12 reveals differential gas adsorption characteristics and high thermal stability. Reversible hydration, facile ligand ...
Dr. Julián Bergueiro Álvarez received his BS in Chemistry from the University of Santiago de Compostela (Spain) in 2007. In 2008 he obtained the MS in Organic Chemistry and in 2013 he received his PhD from USC for his work in sterecontrolled synthesis of retinoids employing transition metal catalyzed reactions in the key steps. During the last year of his PhD he joined the group of Prof. R. Riguera and Prof. E. Quiñoá to work on the synthesis and characterization of stimuliresponse helical polymers and poly(phenylacetylene)[email protected] nanoparticles nanocomposites. In October 2013, he joined Prof. M. Calderón group to carry out his postdoctoral research at Freie Universität Berlin. His current research is focused on gold based thermoresponsive nanogels as novel drug delivery nanocarriers.. Publication at the Calderon Lab. Thermoresponsive Nanodevices in Biomedical Applications. J. Bergueiro, M. Calderón. Macromolecular Bioscience. Macromolecular Bioscience (2015), 15, ...
The change of substituent in the backbone Of L-proline-derived sulfamide-amine alcohol ligand 3 provides chiral propargylic alcohols with the opposite configurations in significant enantioselectivities in the asymmetric addition of phenylacetylene to aldehydes. Meanwhile, the ligand 3 in combination with Ti((OPr)-Pr-i)(4) could also afford the products with opposite absolute configuration in high yields. (c) 2006 Elsevier B.V. All rights reserved ...
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PubMed comprises more than 30 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.
The Pd- or Pd/Cu-catalyzed coupling reactions of halobenzenes bearing the methyl, hydroxymethyl, acetoxymethyl, methoxycarbonyl, or both methoxy and 4,4-dimethyl-4,5-dihydro-1,3-oxazol-2-yl groups in the ortho-position with gaseous or metallated acetylene, (trialkylsilyl)acetylenes, and arylacetylenes have been systematically studied. Various functionalized aryl- or diarylacetylenes have been synthesized in good to excellent yields. Whereas additional fluoro, nitro, or methoxy group attached to the benzene ring does not interfere in the coupling reactions, the presence of a methoxycarbonyl requires a careful optimization of reaction conditions to achieve moderate yields. Keywords: Halobenzenes; Phenylacetylenes; Diphenylacetylenes; Cross-coupling reactions; Palladium catalysis; Arenes; Alkynes. ...
Autori: Placidus B. Amama, Sangyun Lim, Dragos Ciuparu, Yanhui Yang, Lisa Pfefferle, Gary L. Haller. Editorial: Journal of Physical Chemistry B, 109(7), p.2645 -2656, 2005.. Rezumat:. Fe-substituted MCM-41 molecular sieves with ca. 1, 2, and 3 wt % Fe were synthesized hydrothermally using different sources of colloidal silica (HiSil and Cab-O-Sil) and characterized by ICP, XRD, N2 physisorption, UV-vis, EPR, TPR, and X-ray absorption. Catalysts synthesized from Cab-O-Sil showed higher structural order and stability than those from HiSil. The local environment of Fe in the mesoporous material as studied by UV-vis reveals the dominance of framework Fe in all the as-synthesized Fe-MCM-41 samples. Dislodgement of some Fe species to extraframework location occurs upon calcination, and this effect is more severe for Fe-MCM-41 (2 wt %) and Fe-MCM-41 (3 wt %), as confirmed by EPR and X-ray absorption. These materials have been used as catalytic templates for the production of carbon nanotubes (CNTs) by ...
A detailed chemical kinetic model is developed and tested for the combustion of C2 and C3 oxygenated fuels such as ethanol, DME (dimethyl ether), acetone and n-propanol. It is validated by comparing predictions with experimental data on the structure of low pressure burner stabilised premixed flames and laminar burning velocities over a wide range of equivalence ratios. Data from shock tube and stirred reactor studies has also been considered. The elementary reactions of ethanol and DME oxidation have been studied extensively and were used as a starting point for extension to C3 oxygenated fuels. The chemistry of acetylene which is one of major intermediate species in higher hydrocarbon flames was also updated to improve the reliability of the present mechanism and acetylene laminar burning velocities and low-pressure premixed lean and rich flames were also computed. The detailed mechanism features more than 1500 reaction steps and 269 species. The structure of laminar premixed flames are ...
We report on the use of a frequency-modulated continuous-wave technique for multiplexing optical fiber gas sensors. The sensor network is of a ladder topology and is interrogated by a tunable laser. The system performance in terms of detection sensitivity and cross talk between sensors was investigated and found to be limited by coherent mixing between signals from different channels. The system performance can be improved significantly by use of appropriate wavelength modulation-scanning coupled with low-pass filtering. Computer simulation shows that an array of 37 acetylene sensors with a detection accuracy of 2000 parts in 10(6) for each sensor may be realized. A two-sensor acetylene detection system was experimentally demonstrated that had a detection sensitivity of 165 parts in 10(6) for 2.5-cm gas cells (or a minimum detectable absorbance of 2.1 x 10(-4)) and a cross talk of -25 dB.
Textbook solution for Chemistry: An Atoms First Approach 2nd Edition Steven S. Zumdahl Chapter 4 Problem 79E. We have step-by-step solutions for your textbooks written by Bartleby experts!
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Alkynes (Acetylenes) Alkynes are unsaturated open-chain hydrocarbons which contain at least one triple bond in the carbon chain, they form a homologous series, Its general molecular formula is (CnH2n-2), where n the number of ...
Synonyms for alkyne in Free Thesaurus. Antonyms for alkyne. 2 synonyms for alkyne: acetylene, ethyne. What are synonyms for alkyne?
The isotopic effect on the electrochemical CO2 reduction reaction (CO2RR) is investigated in this study. A higher CO2RR selectivity over its competing hydrogen evolution reaction was observed in D2O-based electrolytes compared with the H2O-based counterparts, which can be attributed to the lower [D+] concent
Successful modeling of combustion and emissions in gas turbine engine combustors requires an adequate description of the reaction mechanism. For hydrocarbon oxidation, detailed mechanisms are only available for the simplest types of hydrocarbons such as methane, ethane, acetylene, and propane. These detailed mechanisms contain a large number of chemical species participating simultaneously in many elementary kinetic steps. Current computational fluid dynamic (CFD) models must include fuel vaporization, fuel-air mixing, chemical reactions, and complicated boundary geometries. To simulate these conditions a very sophisticated computer model is required, which requires large computer memory capacity and long run times. Therefore, gas turbine combustion modeling has frequently been simplified by using global reaction mechanisms, which can predict only the quantities of interest: heat release rates, flame temperature, and emissions. Jet fuels are wide-boiling-range hydrocarbons with ranges extending through
JENGAS deliver Acetylene, Oxygen, Nitrogen, CO2 and Argon gas cylinders for home the handyman or business. JENGAS sell gas cylinders outright so there is no deposit or rental
Nanoporous polymers as nanoparticle caging hosts for gas conversions. We showed that common transition metal nanoparticle based composites of porous polymers can catalyze probe reactions such as CO oxidation as good as platinum (J. Mater. Chem. A 2015, 3, 15489). Acetylene can be selectively reduced to ethylene using metal doped-COP-6 networks (ACS Catal. 2016, 6, 2435-2442 ...
I would like to see what people are using to do there line sets. I think it would be fun to see the see how different we are to do the same job. I use the cheep green pads to clean the copper. They leave no residue. Stay-sil 15% brazing rods. Oxygen acetylene torch #3 tip | 5/8 #7 tip | 5/8 Purge line with Argon (not nitrogen) Thermal Engineering analog Vacuum Gauge. Robinair 5 cfm Vacuum Pump.
Infrared and Raman spectra of mono {sup 13}C fully deuterated acetylene, {sup 13}C{sup 12}CD{sub 2}, have been recorded and analysed to obtain detailed information on the C-D stretching fundamentals and associated combination, overtone, and hot bands. Infrared spectra were recorded at an instrumental resolution ranging between 0.006 and 0.01 cm{sup −1} in the region 1800-7800 cm{sup −1}. Sixty new bands involving the ν{sub 1} and ν{sub 3} C-D stretching modes also associated with the ν{sub 4} and ν{sub 5} bending vibrations have been observed and analysed. In total, 5881 transitions have been assigned in the investigated spectral region. In addition, the Q branch of the ν{sub 1} fundamental was recorded using inverse Raman spectroscopy, with an instrumental resolution of about 0.003 cm{sup −1}. The transitions relative to each stretching mode, i.e., the fundamental band, its first overtone, and associated hot and combination bands involving bending states with υ{sub 4} + υ{sub 5} up ...
Method for separating aromatic compounds using simulated moving bed operation | High energy reduction in a propane dehydrogenation unit by utilizing a high pressure product splitter column | Process for producing olefins | Feed pretreating | Process for simultaneous production of benzene and ethylene by conversion of acetylene |
The term macromolecule was coined by Nobel laureate Hermann Staudinger in the 1920s, although his first relevant publication on this field only mentions high molecular compounds (in excess of 1,000 atoms). [1]. At that time the phrase polymer as introduced by Berzelius in 1833 had a different meaning from that of today: it simply was another form of isomerism for example with benzene and acetylene and had little to do with size.[2]. Usage of the term to describe large molecules varies among the disciplines. For example, while biology refers to macromolecules as the four large molecules comprising living things, in chemistry, the term may refer to aggregates of two or more macromolecules held together by intermolecular forces rather than covalent bonds but which do not readily dissociate.[3]. According to the standard IUPAC definition, the term macromolecule as used in polymer science refers only to a single molecule. For example,a single polymeric molecule is appropriately described as a ...
Other articles where Agamassan is discussed: Nils Dalén: …in 1909 and then invented Agamassan, a substance that absorbs acetylene, making it possible to concentrate the gas with no danger of explosion. He was blinded by an explosion during an experiment in 1913, but he continued experimental work until his death.
Abele E.; Rubina K.; Lukevics E. Novel fluoride ion-mediated method of O-silylation and germylation of aromatic and heterocyclic oximes with terminal silylated and germylated acetylenes under phase transfer catalysis conditions . Latvian J. Chem. 2000(1), 77-81 ...
Students will learn basic skills related to welding and agricultural mechanics. Students will develop skills in the areas of working hot and cold metal including welding processes such as oxy/acetylene, shielded metal arc welding, gas metal arc welding (MIG), and project construction. Students will also learn to maintain, repair, and operate small gas engines. Additional basic skills may be taught including: plumbing, painting, measurements and tool identification. Emphasis will be placed on safety and proper use of tools and equipment. This class is part of an integral agriculture program ...
9 Best Kitchen Chimney in India 2021 (For Your Sparkling .... CG-30 STRAIGHT LINE CUTTING MACHINE Performs high quality straight, and bevel cuts. Includes 1 torch. 3 tips Airco/Concoa Style for Acetylene, Nº 1, 2 and 3. 70 inches rail. Stepless Drive System Maintains constant travel speed even at high temperatures for stable cuts. Lightweight, easy to carry and use. High-Quality Tips for fast and smooth .... View More ,,. ...
When using the MÄKTIG retractable twin welding hose reel, your welding hoses are stretched to only the necessary length, leaving the rest nice and tidy inside the reel and away from other tools and equipment. Compared to its rivals, this hose reel is definitely on the high end of the quality engineering spectrum. It is constructed of industrial-grade steel and equipped with 50 feet of ¼-inch diameter oxygen and acetylene hoses capable of bearing 200 psi of pressure. The directional rollers make deployment in any direction a breeze. These hoses feature dual O-ring seals and a whip hose with hose stop. The reel tension is also adjustable so you can use as much or as little effort to deploy it as you like ...
Plastic Model Kit. Rare. Dated 1970. Wild kit featuring detailed, all chrome Corvair engine and rear suspension, Goodyear slicks in rear with narrow tires up front, dropped front axle, chrome mag wheels, steerable front wheels, acetylene headlights and carriage lamp taillight, wrap-around flower box, one-piece fender with upholstered running board, hourglass taxi meter, bulb honk horn, custom bucket seats, luggage rack with guitar, suitcase and attache case and clear plastic windows with etched design. Molded in light blue, chrome plate, clear and with black tires. The kit has never been started. It has been inventoried complete with all parts and includes near mint condition decals and instructions.
This list of 10 letter words containing n has 5743 entries. It may be helpful for people looking for words that contain N, and 10 letter words with n. abandoning, abasements, abatements, abdicating, abdication, abducentes, aberration, abeyancies, abhorrence, abjectness, abjuration, abnegating, abnegation, abnormally, abolishing, abolitions, abominable, abominated, abominates, aboriginal, aborigines, abreacting, abridgment, abrogating, abscessing, absconding, absolution, absorbency, absorption, abstainers, abstaining. abstention, absterging, abstinence, abundances, abundantly, acanthuses, accentuate, acceptance, accessions, accidental, acclaiming, accordance, accordions, accountant, accounting, accoutring, accusation, acerbating, acetifying, acetylenes, achinesses, acidifying, acidnesses, acierating, acquainted, acquitting, acrimonies, activating, activation, adamancies, adaptation, addictions, additional, addressing, adenitises, adenopathy. adherences, adhibiting, adjourning, adjustment, ...
[145 Pages Report] Acetaldehyde Market Analysis categorizes the global market By Manufacturing Process (Acetylene Hydration, Others) Application (F&B, Pulp & Paper bleaching, Others) & geography
I couldnt wait till my husband came home from work to set things up properly, so I used my acetylene/atmospheric torch. The colors are a little muddy and a bit of a challenge with only one hand, but not to bad. I may have to break down and use some color in my work ...
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Nitrogenases are vitally important enzymes that perform an amazing chemical reaction, the reduction of N2 to ammonia. In nitrogenases, iron-sulfur clusters cata...
Due to inconsistencies between the drug labels on DailyMed and the pill images provided by RxImage, we no longer display the RxImage pill images associated with drug labels. We anticipate reposting the images once we are able identify and filter out images that do not match the information provided in the drug labels. ...
Title: Antique Japanese Ichimatsu Ningyo Boy Doll Late Meiji Period, Price: $775 USD REDUCED, Category: Dolls:Antique Dolls:Papier Mache:Ichimatsu, Shop: The Doll Fixer, Description: Description of Doll for Sale This is a stunning example of a Ichimatsu Ningyo Japanese boy doll from the late Meiji period (early 1900s). He has a composition and cloth body and is anatomically
... s are traditionally known as acetylenes, although the name acetylene also refers specifically to C2H2, known formally as ... In acetylene, the H-C≡C bond angles are 180°. By virtue of this bond angle, alkynes are rod-like. Correspondingly, cyclic ... This suffix arose as a collapsed form of the end of the word "acetylene". The final "-e" disappears if it is followed by ... Ethyne is commonly called by its trivial name acetylene. In chemistry, the suffix -yne is used to denote the presence of a ...
Grignard reagents of acetylene or alkynes can be used to perform alkynylations on compounds that are liable to polymerization ... When the acetylide is formed from acetylene, the reaction gives an α-ethynyl alcohol. This process is often referred to as ... The Favorskii reaction is an alternative set of reaction conditions, which involves prereaction of the acetylene with an alkali ... Chemist Walter Reppe pioneered catalytic, industrial-scale ethynylations using acetylene with alkali metal and copper(I) ...
"ACETYLENE EXPLOSION". Sydney Morning Herald (NSW : 1842 - 1954). 9 November 1916. p. 8. Retrieved 27 May 2020. "Family Notices ... Their eldest son, Henry Guildford Hoskins was fatally injured in an acetylene gas explosion, in 1916, while repairing a gas ...
Acetylene zipper. Exceptionally facile contrathermodynamic multipositional isomeriazation of alkynes with potassium 3- ...
It is produced by the vinylation of carbazole with acetylene in the presence of base. Carbazole Lide, David R. (2008). CRC ... "Acetylene Chemistry". Ullmann's Encyclopedia of Industrial Chemistry. doi:10.1002/14356007.a01_097.pub3. ISBN 3527306730.. ...
Condensation of aldehydes and ketones with acetylene under pressure. New method of synthesis of acetylenic alcohols". Zhurnal ... Nazarov IN, Kotlyarevskii IL, Ryabchenko VF (1953). "Acetylene derivatives. CLX. ...
Subsequently, acetylene is used to introduce the vinyl group. Methylpyrrolidone (NMP) 2-Pyrrolidone (2-Py) "1-Vinyl-2- ... It is produced industrially by vinylation of 2-pyrrolidone, i.e. the base-catalyzed reaction with acetylene. It is the ... "Acetylene Chemistry". Ullmann's Encyclopedia of Industrial Chemistry. doi:10.1002/14356007.a01_097.pub3. ISBN 3527306730. N- ...
Acetylene zipper. Exceptionally facile contrathermodynamic multipositional isomeriazation of alkynes with potassium 3- ...
Sykes contributed an entry to the 14th edition of the Encyclopaedia Britannica on the experimental use of acetylene as an ... William Stanley Sykes (1930). "Acetylene in medicine". Encyclopaedia Britannica. 1 (14 ed.). p. 119. Photographic portraits by ...
Henning Hopf; Bernhard Witulski (1995). "Functionalized Acetylenes in Organic Synthesis ‐ The Case of the 1‐Cyano‐ and the 1‐ ... Halogenoacetylenes". In Stang, Peter J.; Diederich, François (eds.). Modern Acetylene Chemistry. Weinheim: VCH. pp. 33-66. doi: ...
"Functionalized Acetylenes in Organic Synthesis ‐ The Case of the 1‐Cyano‐ and the 1‐Halogenoacetylenes". In Stang, Peter J.; ... Diederich, François (eds.). Modern Acetylene Chemistry. Weinheim: VCH. pp. 33-66. doi:10.1002/9783527615278.ch02. ISBN ...
Living on acetylene. A Primordial Energy Source". In Kroneck, Peter M. H.; Sosa Torres, Martha E. (eds.). The Metal-Driven ...
Acetylene hydratase is an unusual metalloenzyme in that it catalyzes a hydration reaction. Two reaction mechanisms have been ... ten Brink, Felix (2014). "Chapter 2. Living on acetylene. A Primordial Energy Source". In Peter M.H. Kroneck; Martha E. Sosa ...
Sahoo, Manoj (2007). "Dimethyl Acetylene Dicarboxylate". Synlett. 2007 (13): 2142-2143. doi:10.1055/s-2007-984894. Bandrowski, ...
acétique) acetylene, (Fr. acétylène) achieve, (Old Fr. achever) achievement, (Fr. achèvement) acid, (Fr. acide) aconite, (Fr. ...
Acetylene. C2H2. C = 4 H = 1. C = −1 H = +1 ...
Acetylene. 49.9. 21,500. 1,300.0. Benzene. 41.8. 18,000. 3,270.0. Ammonia. 22.5. 9,690. 382.6. ...
Acetylene. 54.2. 226.8 C3H8. Propane. −25.0. −104.6 C4H10. n-Butane. −30.0. −125.5 ...
He is known for his contributions to acetylene research and its use as the basis for one type of synthetic rubber, which ... During his doctoral studies into the chemistry of acetylene, he discovered the chemical compound lewisite, which would later ... In 1920, he successfully polymerized acetylene into divinylacetylene. Elmer Bolton, the Director of Research at DuPont, used ... S2CID 85968031.[permanent dead link] Nieuwland, Julius Arthur (1904). Some Reactions of Acetylene. Notre Dame, Indiana: Notre ...
Lighting was originally acetylene. Most of the problems experienced with McKeen cars involved the powerplant and drivetrain. As ...
Reppe's synthesis of cyclooctatetraene, which involves treating acetylene at high pressure with a warm mixture of nickel ... I. Über Cyclooctatetraen" [Ring-forming polymerization of acetylene. I. Cyclooctatetraene]. Justus Liebigs Annalen der Chemie. ... Kunichika, Sango (1953). "Cyclopolyolefins Derived from Acetylene". Bulletin of the Institute for Chemical Research, Kyoto ... one-step synthesis of cyclooctatetraene from acetylene, providing material identical to that prepared by Willstätter. Any ...
See also: Nieuwland, Julius A.; Vogt, Richard R. (1945). The Chemistry of Acetylene. New York City, New York, USA: Reinhold ... The Italian chemist Adolfo Baschieri discovered that nitroform (Italian: nitroformio) could be produced from acetylene ( ... it was discovered that nitroform can be produced by the reaction of acetylene with anhydrous nitric acid. This method went on ... On the behavior of acetylene with some oxidizers]. Atti della Reale Accademia dei Lincei. 5th series (in Italian). 9 (part I): ...
Applications of calcium carbide include manufacture of acetylene gas, and for generation of acetylene in carbide lamps; ... Approximately 400,000 tonnes are produced this way annually (see Acetylene Preparation). In China, acetylene derived from ... Today acetylene is mainly manufactured by the partial combustion of methane or appears as a side product in the ethylene stream ... CaC2(s) + 2H2O(aq) → C2H2(g) + Ca(OH)2(aq) This reaction was the basis of the industrial manufacture of acetylene, and is the ...
"Metal-Acetylene Complexes II. Acetylene Complexes of Nickel, Palladium and Platinum". Can. J. Chem. 46 (24): 3879-3891. doi: ... Induced Oligomerization of Acetylenes: An Organometallic Detective Story". Acc. Chem. Res. 9 (3): 93-99. doi:10.1021/ ...
Kunichika, Sango (1953). "Cyclopolyolefins Derived from Acetylene". Bulletin of the Institute for Chemical Research, Kyoto ...
The headlights used acetylene. A total of 6,575 Oldsmobile vehicles were manufactured in 1909, with 5,325 of those being the ...
It featured acetylene lighting. A top speed of above 30 mph (48 km/h) was claimed. The monocar was joined in November 1922 by a ...
In this process, acetylene is dimerized to give vinyl acetylene, which is then combined with hydrogen chloride to afford 4- ... Furthermore, the intermediate vinyl acetylene is unstable. This "acetylene process" has been replaced by a process, which adds ... Until the 1960s, chloroprene production was dominated by the "acetylene process," which was modeled after the original ... "Acetylene Polymers and their Derivatives. II. A New Synthetic Rubber: Chloroprene and its Polymers". Journal of the American ...
Wallace H. Carothers, Ira Williams, Arnold M. Collins, and James E. Kirby (1937). "Acetylene Polymers and their Derivatives. II ...
The substance may polymerize. Decomposes on heating and increasing pressure. This generates fire and explosion hazard. The substance is a strong reducing agent. It reacts violently with oxidants and fluorine or chlorine under influence of light. This generates fire and explosion hazard. Reacts with copper, silver, mercury and their salts. This produces shock-sensitive compounds (acetylides ...
Scientific American is the essential guide to the most awe-inspiring advances in science and technology, explaining how they change our understanding of the world and shape our lives.
It melts at -80.8°C and boils at -84.0°C. Offensive odors often noted in commercial acetylene are due to impurities. Acetylene ... acetylene (əsĕt´əlēn´) or ethyne (ĕth´īn), HC[triple bond]CH, a colorless gas. ... Acetylene How Products Are Made COPYRIGHT 1996 Gale Research Inc.. Acetylene. Background. Acetylene is a colorless, combustible ... Acetylene Chemical Compounds COPYRIGHT 2006 Thomson Gale. Acetylene. OVERVIEW. Acetylene (uh-SET-ill-ene) is the simplest ...
Acetylene tetrabromide. CAS No: 79-27-6. NOTE:. (1) Efficacy of Medical Tests has not been evaluated.. (2) NIOSH references ... Acetylene tetrabromide. Editor(s). /Author(s). Specific Medical Test(s) or Examination(s). Reference(s). ...
The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database ...
I. Apparatus and initial observations on acetylene, acetylene-d2, benzene, and benzene-d6, J. Res. NBS, 1964, 68A, 409. [all ... Coats, F.H.; Anderson, R.C., Thermodynamic data from electron-impact measurements on acetylene and substituted acetylenes, J. ... Rosmus, P.; Botschwina, P.; Maier, J.P., On the ionic states of vinylidene and acetylene, Chem. Phys. Lett., 1981, 84, 71. [all ... Shiromaru, H.; Achiba, Y.; Kimura, K.; Lee, Y.T., Determination of the C-H bond dissociation energies of ethylene and acetylene ...
Although the oxy-acetylene processes have been superseded in great measure by modern techniques like M.I.G. welding and plasma- ... Although the oxy-acetylene processes have been superseded in great measure by modern techniques like M.I.G. welding and plasma- ... C. G. Bainbridge and F. Clarke, Oxy-acetylene Welding Repair Manual, B.O.C. Ltd, Waltham Cross, 1968Google Scholar ... BS 1821:1957 Class I oxy-acetylene welding for steel pipelines and pipe assemblies for carrying fluidsGoogle Scholar ...
Ethine, Ethyne [Note: A compressed gas used in the welding & cutting of metals.] Colorless gas with a faint, ethereal odor. [Note: Commercial grade has a garlic-like odor. Shipped under pressure dissolved in acetone.]
In enzymology, an acetylene hydratase (EC 4.2.1.112) is a rare example of an enzyme containing tungsten. It catalyzes the ... ten Brink, Felix (2014). "Chapter 2. Living on acetylene. A Primordial Energy Source". In Peter M.H. Kroneck and Martha E. Sosa ... The mechanism is thought to involve attachment of acetylene to the metal followed by nucleophilic attack of water. This enzyme ... The systematic name of this enzyme class is acetaldehyde hydro-lyase (acetylene-forming). Other names in common use include AH ...
Acetylene is a 2005 album by The Walkabouts. It features themes of anger and chaos. All songs by Chris Eckman. "Fuck Your Fear ... "Acetylene" - 3:36 "Before This City Wakes" - 6:02 "The Last Ones" - 9:09 Terri Moeller - drums Michael Wells - bass guitar ...
... vinyl acetylene, divinyl acetylene, diacetylene, propadiene, hexadiene, butadienyl acetylene, and methyl acetylene. ... Special Hazards of Acetylene United States Department of Labor.. *Acetylene, the Principles of Its Generation and Use, ... Berthelot oxidized acetylene to yield acetic acid and oxalic acid. He found acetylene could be reduced to form ethylene and ... Acetylene is also used in the acetylene (carbide) lamp, once used by miners (not to be confused with the Davy lamp), on ...
This lack of acetylene is important because that chemical would likely be the best energy source for a methane-based life on ... But Cassini detected no acetylene on the surface. In addition Cassinis spectrometer detected an absence of water ice on the ... One interpretation of the acetylene data is that the hydrocarbon is being consumed as food. But McKay said the flow of hydrogen ... The absence of detectable acetylene on the Titan surface can very well have a non-biological explanation, said Mark Allen, ...
Accurate measurements of trace concentrations of acetylene can be very useful in validating hydrocarbon... ... Acetylene is an important combustion intermediate and plays a critical role in soot formation. ... Mole Fraction Acetylene Shock Tube Absorption Cross Section Reflected Shock Wave This is a preview of subscription content, log ... Acetylene is an important combustion intermediate and plays a critical role in soot formation. Accurate measurements of trace ...
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice ...
Acetylene. Regulatory process names 11 Translated names 42 CAS names 1 IUPAC names 7 Trade names 11 Other identifiers 4 ...
Acetylene, dissolved. Chemical name:. Acetylene. Class:. 2.1. Packaging group:. -. EmS code:. _F-D_, _S-U_. Labels:. Extremely ... Acetylene, dissolved. Chemical name:. Acetylene. Language:. English. Class:. 2. Classification code:. F+ ; R12 ; R5 ;R6. ... Acetylene, dissolved. Chemical name:. Acetylene. Language:. English. Class:. 2. Classification code:. F+; R12. R5, R6. ... Acetylene , dissolved. Chemical name:. Acetylene. Class:. 2.1. Packaging group:. -. Labels:. Extremely flammable. Remarksopen ...
An oxy acetylene torch is an affordable and versatile tool used by many people to heat, weld, solder, and cut metal. It uses ... How to Set Up an Oxy Acetylene Torch. ... Connect the acetylene hose to the acetylene regulator and to ... Fasten oxygen and acetylene cylinders in an upright position. If you have a cylinder cart, place both the oxygen and acetylene ... Reduce the acetylene flow by adjusting the torch acetylene valve. The flame should start to produce black smoke around the ...
When it comes to Acetylene, Liquefied Propane, Oxygen Welding Regulators you can count on Grainger. Supplies and solutions for ... Acetylene, Liquefied Propane, Oxygen Welding Regulators 1 product Welding regulators are used to control and regulate the flow ... Miller Electric Gas Regulators are designed to provide control of gases such as acetylene, oxygen, liquefied propane, argon, ...
OSHA is confirming the effective date of its direct final rule that revises the Acetylene Standard for general industry by ... Therefore, OSHA considers acetylene plants in existence prior to the effective date of NFPA 51A-2001 (i.e., February 9, 2001) ... Revising Standards Referenced in the Acetylene Standard. A Rule by the Occupational Safety and Health Administration on 11/10/ ... Two commenters appeared to confuse the Acetylene Standard at 29 CFR 1910.102, which was the subject of this rulemaking, with ...
acetylenes synonyms, acetylenes pronunciation, acetylenes translation, English dictionary definition of acetylenes. n. A ... acetylene. [əˈsetɪliːn]. A. N → acetileno m. B. CPD acetylene burner N → soplete m oxiacetilénico. acetylene lamp N → lámpara f ... acetylene. [əˈsɛtɪliːn] n → acetilene m. acetylene burner → becco ad acetilene. acetylene welding → saldatura ad acetilene ... acetylene. (redirected from acetylenes). Also found in: Thesaurus, Medical, Encyclopedia.. Related to acetylenes: ethyne ...
The century-old challenge of transporting acetylene may have been solved in principle by a team of scientists working at the ... Exceptionally High Acetylene Uptake in a Microporous Metal - Organic Framework With Open Metal Sites. Journal of the American ... Acetylene, widely used in decades past for welding and illumination, is now also valuable as a starting point for synthesizing ... To safely store acetylene, storage cylinders have to be filled with both porous material and liquid solvents such as acetone. ...
https://wilhelmsen.com/product-catalogue/application-areas/container/engine-room/workshop/gases/oxygen-acetylene-cutting/ ...
This set of three acetylene/hydrogen soldering tips is used in conjunction with the Versa-Torch™ tip tube to give you the ...
It is the highest-resolution map of acetylene to date on Jupiter. The enhanced emission results both from the warmer ... These images and movie show the distribution of the organic molecule acetylene at the north and south poles of Jupiter, based ... These images and movie show the distribution of the organic molecule acetylene at the north and south poles of Jupiter, based ... It is the highest-resolution map of acetylene to date on Jupiter. The enhanced emission results both from the warmer ...
Regulator: acetylene. • Tank type: B. • CGA tank connection: 520. • Dual or Single stage: single. • Number of gauges: two. • ...
Reports emphasize significant developments in process technology for Acetylene that have potential implications for the ... Also in this report, SRI evaluates the technology of recovering the acetylene that is by-produced in ethylene production and ... Acetylene vs Ethylene as a Chemical Raw Material - Chemical production and investment cost ... The thermal cracking process for producing acetylene, once widely used, has been abandoned. The submerged flame process was ...
Series Title: PPI: Other industrial gases (including fluorocarbon and acetylene); NSA For this series: Numerical Data , Source ... Series Title: PPI: Other industrial gases (including fluorocarbon and acetylene); NSA For this series: Numerical Data , ...
The Global Acetylene Industry 2015 Market Research Report is a professional and in-depth study on the - Market Research Reports ... 1.2 Classification of Acetylene. 1.3 Applications of Acetylene. 1.4 Industry Chain Structure of Acetylene. 1.5 Industry ... Table Specifications of Acetylene. Table Classification of Acetylene. Figure Global Production Market Share of Acetylene by ... 1.5.1 Industry Overview of Acetylene. 1.5.2 Global Major Regions Status of Acetylene. 1.6 Industry Policy Analysis of Acetylene ...
Acetylene is colorless and extremely unstable in its pure form, which is why it is ... Acetylene is a hydrocarbon compound and is the simplest form of alkyne. ... What is an Acetylene Torch?. Acetylene is a hydrocarbon compound and is the simplest form of alkyne. Acetylene is colorless and ... What is an Acetylene Torch?. An acetylene torch is a hand-held torch with one or two hoses that connect to two separate gas ...
What do you think of Acetylene-Air torches? - Im thinking of branching out from silversmithery into building a couple of ... What do you think of Acetylene-Air torches? Im thinking of branching out from silversmithery into building a couple of frames ... and I was wondering if acetylene-air is adequate for brazing a frame. I have a Presto-lite with #2 (itsy)-#5 (1/4 inch) tips. ...
  • car manufacturers, for instance, still use the process and almost every garage and small workshop has its oxy-acetylene welding and cutting equipment. (springer.com)
  • Acetylene, widely used in decades past for welding and illumination, is now also valuable as a starting point for synthesizing a range of chemicals used in plastics and explosives. (scienceblog.com)
  • Acetylene was once the preferred gas in welding/cutting applications due to its ability to reach extremely high temperatures (3300 degrees Celsius/6000 degrees Fahrenheit) when mixed with oxygen. (tech-faq.com)
  • Acetylene is widely used for welding purposes, although it is not as common as it once was. (tech-faq.com)
  • In welding, two pieces of metal are pressed together while a welder or welding machine uses an acetylene torch to concentrate heat on the point where the two metals touch. (tech-faq.com)
  • Worker in heavy heat-resistant protective clothing holding oxy-acetylene welding equipment. (sciencephoto.com)
  • The purpose of this page is to introduce the beginning welder to the equipment used in the Oxy-Acetylene welding process. (voortrekker-history.co.za)
  • ADVERTISEMENTS: This article throws light upon the ten basic equipment's used for oxy-acetylene welding. (voortrekker-history.co.za)
  • Old oxygen and acetylene tanks and welding equipment along with an old Plymouth van . (collinsdictionary.com)
  • Calcium carbide (or calcium acetylide) and water are then reacted by any of several methods to produce acetylene and calcium hydroxide. (newworldencyclopedia.org)
  • Scientists had expected the sun's interactions with chemicals in the atmosphere to produce acetylene that falls down to coat the Titan surface. (nasa.gov)
  • Calcium carbide (CaC2) reacts with water to produce acetylene as follows. (jiskha.com)
  • acetylene (əsĕt´əlēn´) or ethyne (ĕth´īn) , HC[triple bond]CH, a colorless gas. (encyclopedia.com)
  • What is acetylene (ethyne) used for? (bartleby.com)
  • It catalyzes the hydration of acetylene to give acetaldehyde: C2H2 + H2O → CH3CHO The W centre is bound to two molybdopterin cofactors. (wikipedia.org)
  • Acetylene (C2H2) inhibits key enzymes involved in nitrification (Ammonium monooxygenase) and denitrification (N2O reductases). (nih.gov)
  • What mass of acetylene, C2H2, will be produced for the reaction of 90.g of calcium carbide, CaC2, with water in the following reacion? (jiskha.com)
  • Calcium carbide (CaC2) reacts with water to form acetylene (C2H2) gas and calcium hydroxide (Ca(OH)2). (jiskha.com)
  • Acetylene gas, C2H2, and solid calcium hydroxide were formed by the reaction of calcium carbide, CaC2, with water. (jiskha.com)
  • An oxy acetylene torch is an affordable and versatile tool used by many people to heat, weld, solder, and cut metal. (wikihow.com)
  • Using pressure-reducing regulators, connecting gas supplies, and safely lighting the torch flame are all essential parts of learning how to use an oxy acetylene torch. (wikihow.com)
  • The regulators let you see how much pressure you're using while working and are essential to safely starting and operating an oxy acetylene torch. (wikihow.com)
  • This set of three acetylene/hydrogen soldering tips is used in conjunction with the Versa-Torch™ tip tube to give you the ability to solder small and large projects. (riogrande.com)
  • What is an Acetylene Torch? (tech-faq.com)
  • An acetylene torch is a hand-held torch with one or two hoses that connect to two separate gas tanks. (tech-faq.com)
  • While the term "acetylene torch" can be used to refer specifically to a torch that uses acetylene, it can also describe any oxy-fuel torch in general in which other gases such as propylene, hydrogen, propane, natural gas, liquefied petroleum gas, or MAPP gas can be used. (tech-faq.com)
  • The welder then shuts off the acetylene torch and allows the liquid metal to cool and turn back into a solid. (tech-faq.com)
  • In this scenario, an acetylene torch is used to heat the metal to a kindling temperature while a stream of pure oxygen is applied to the desired area. (tech-faq.com)
  • I have an oxy-acetylene tank for my mig welder but haven't done anything with a cutting torch. (weldingweb.com)
  • Acetylene is easily prepared commercially by the reaction of calcium carbide with water, but is prepared commercially by the pyrolysis of hydrocarbons. (encyclopedia.com)
  • The developed reaction conditions led to high yields of unprotected acetylenes with cyclic, nitro and linear keto esters as well as keto amides. (epfl.ch)
  • This allows a new direct access to chiral acetylene compound in high yields under operationally simple reaction conditions. (epfl.ch)
  • In many instances, the reaction sequence regiospecifically ligates azides and terminal acetylenes to give only 1,4-disubstituted [1,2,3]-triazoles. (freepatentsonline.com)
  • We have performed an in situ x-ray absorption fine structure study of gold/carbon (Au/C) catalysts under acetylene hydrochlorination reaction conditions and show that highly active catalysts comprise single-site cationic Au entities whose activity correlates with the ratio of Au(I):Au(III) present. (sciencemag.org)
  • The making of acetylene gas from the reaction of water with calcium carbide has long been known. (voortrekker-history.co.za)
  • The physical and CO 2 permeation properties of its crosslinked membranes prepared by the cyclotrimerization reaction of the acetylene groups at the polymer chain end using tantalum (V) chloride (TaCl 5 ) as a catalyst under thermal treatment was investigated in terms of CO 2 -induced membrane plasticization. (wiley.com)
  • The cyclotrimerization reaction of the acetylene groups at the polymer chain ends using a transition metal catalyst under thermal treatment was found to be more effective than conventional thermal treatments for suppressing membrane plasticization without the membrane densification. (wiley.com)
  • Development on new intermolecular reductive cyclized reaction of acetylenes and its development to the material science. (worldwidescience.org)
  • A Ru-based catalyst (Ru/N-AC) was prepared using N-doped carbon as the support and the catalytic performance of the one-step synthesis reaction of vinyl chloride monomer (VCM) from acetylene and 1,2-dichloroethane (EDC) was assessed. (rsc.org)
  • Through BET, TG, XPS, ICP, TPR, TPD, TEM and XRD characterization, it is indicated that N-doped AC support can increase the amount of RuO 2 and RuO x species in the catalyst and enhance its adsorption ability for both EDC and acetylene, suggesting that the N dopant and Ru species generated a synergistic effect in the one-step synthesis reaction of VCM. (rsc.org)
  • Acetylene (C 2 H 2 ) can be produced from the reaction of calcium carbide (CaC 2 ) with water. (bartleby.com)
  • No. 3,845,018 and is a multi-step procedure involving the initial reaction of an aromatic tetracarboxylic acid dianhydride such as benzophenone tetracarboxylic acid dianhydride with an aromatic diamine to form an anhydride-capped polyamic acid, which is subsequently reacted with an aminoarylacetylene to produce an acetylene-terminated polyamic acid oligomer, which is then thermally converted to the desired acetylene-substituted polyimide oligomer. (google.com)
  • If the acetylene were burned to form water and carbon dioxide, how many kilojoules of energy would be produced from the complete reaction of 20 of calcium carbide? (jiskha.com)
  • Berthelot was able to prepare acetylene from methyl alcohol, ethyl alcohol, ethylene , or ether , when he passed any one of these as a gas or vapor through a red-hot tube. (newworldencyclopedia.org)
  • This suggests that the suicide inhibition of P450s by propynylaryl acetylenes proceeds via a methylaryl ketene formed by a 1,2-methyl rearrangement, analogous to the mechanism of suicide inhibition by ethynyl acetylenes that proceed via ketene intermediates formed by 1,2-hydrogen shifts [Ortiz de Montellano, P. R., and Kunze, K. L. (1981) Arch. (nih.gov)
  • The polyamic acid oligomer is thereafter converted to the desired acetylene-terminated polyimide oligomer by heating in the continued presence of said N-methyl-2-pyrrolidone. (google.com)
  • The N-methyl-2-pyrrolidone can then be removed by any suitable means such as by precipitation of the acetylene-substituted polyimide oligomer in a non-solvent such as ethanol. (google.com)
  • Above 400 °C(673 K) (which is quite low for a hydrocarbon), the pyrolysis of acetylene will start. (newworldencyclopedia.org)
  • One interpretation of the acetylene data is that the hydrocarbon is being consumed as food. (nasa.gov)
  • Accurate measurements of trace concentrations of acetylene can be very useful in validating hydrocarbon oxidation and soot formation mechanisms. (springer.com)
  • Acetylene is a hydrocarbon compound and is the simplest form of alkyne. (tech-faq.com)
  • We have focused on acetylene, the third most abundant hydrocarbon in Titan s atmosphere after CH 4 and C 2 H 6 . (astrobiology.com)
  • Further, acetylene is the most abundant unsaturated hydrocarbon in Titan s atmosphere. (astrobiology.com)
  • He found acetylene could be reduced to form ethylene and ethane . (newworldencyclopedia.org)
  • In the late 1990s, because of the pressure exerted on the cost of ethylene by the increasing price of oil, interest in the long-dormant subject of acetylene production was renewed. (ihs.com)
  • Also in this report, SRI evaluates the technology of recovering the acetylene that is by-produced in ethylene production and compares the economics of recovery with that of hydrogenation. (ihs.com)
  • The competitive position of acetylene relative to ethylene in vinyl chloride and vinyl acetate production and relative to propylene in acrylic acid production is described. (ihs.com)
  • The usage of ethylene and acetylene are to be described. (bartleby.com)
  • According to the C-C bond lengths obtained, the adsorbed molecule was modified from acetylene-like into ethylene-like on the δ-MoC(001) surface (desired behavior for hydrogenation reactions) but into ethane-like on TiC(001) and ZrC(001). (osti.gov)
  • Fasten oxygen and acetylene cylinders in an upright position. (wikihow.com)
  • If you have a cylinder cart, place both the oxygen and acetylene cylinders into it. (wikihow.com)
  • Connect the oxygen and acetylene regulators to their cylinders. (wikihow.com)
  • To safely store acetylene, storage cylinders have to be filled with both porous material and liquid solvents such as acetone. (scienceblog.com)
  • Clarification of 29 CFR 1926.350(b)(4) to Permit Cylinders Containing Oxygen, Acetylene or Other Fuel Gas to be Taken into Tunnels. (osha.gov)
  • 29 CFR 1926.350(b)(4) states: "Cylinders containing oxygen or acetylene or other fuel gas shall not be taken into confined spaces. (osha.gov)
  • Always comply with all local regulations governing the transport of cylinders in vehicles and the safe unloading and storage of acetylene cylinders. (boconline.co.uk)
  • Read the latest operational guidance on dealing with acetylene cylinders involved in fires. (boconline.co.uk)
  • Acetylene-dicarboxylic acid (CAS 142-45-0) Market Research Report 2018 contents were prepared and placed on the website in January, 2018. (marketpublishers.com)
  • Please note that Acetylene-dicarboxylic acid (CAS 142-45-0) Market Research Report 2018 is a half ready publication and contents are subject to change. (marketpublishers.com)
  • 1-Phenyl-2-(trimethylsilyl)-acetylene (CAS 2170-06-1) Market Research Report 2018 contents were worked out and placed on the website in February, 2018. (marketpublishers.com)
  • Please note that 1-Phenyl-2-(trimethylsilyl)-acetylene (CAS 2170-06-1) Market Research Report 2018 is a half ready publication and contents are subject to change. (marketpublishers.com)
  • Albany, US, 2018-Mar-06 - /EPR Network/ - An up-to-date research report has been disclosed by Market Research Hub highlighting the title " Global Acetylene Black Market Report 2018 " which provides an outlook of current market growth as well as the expected forecast including Rate on Investment (ROI) together with growing CAGR near XX% during 2018-2025. (express-press-release.net)
  • Acetylene is the simplest alkyne . (encyclopedia.com)
  • Finally, sulfonyl acetylenes are efficient for alkyne transfer on carbon-centered radicals. (epfl.ch)
  • Catalyzes the hydration of acetylene to form acetaldehyde. (mybiosource.com)
  • The mercuric chloride catalyst for acetylene hydrochlorination creates vinyl chloride, an important polymer feedstock. (sciencemag.org)
  • In enzymology, an acetylene hydratase (EC 4.2.1.112) is a rare example of an enzyme containing tungsten. (wikipedia.org)
  • Acetylene hydratase participates in tetrachloroethene degradation. (wikipedia.org)
  • Structure of the non-redox-active tungsten/[4Fe:4S] enzyme acetylene hydratase" (PDF). (wikipedia.org)
  • therefore, C 2 H 2 consumption could be attributed to acetylene hydratase (AH) rather than nitrogenase activity. (usgs.gov)
  • Below are the list of possible Acetylene hydratase products. (mybiosource.com)
  • Also known as Acetylene hydratase (Ahy). (mybiosource.com)
  • Previous models had predicted that hydrogen molecules, a byproduct of ultraviolet sunlight breaking apart acetylene and methane molecules in the upper atmosphere, should be distributed fairly evenly throughout the atmospheric layers. (nasa.gov)
  • The Titan surface is also so cold that a chemical process that involved a catalyst would be needed to convert hydrogen molecules and acetylene back to methane, even though overall there would be a net release of energy. (nasa.gov)
  • 4 CO2 + 2 H2O, two molecules of acetylene combine with five compounds of two bonded oxygen atoms to form four molecules of carbon dioxide and two molecules of water. (reference.com)
  • We observed that about 15% of the initial acetylene is photodesorbed, with a photodesorption rate of (2.1 +/- 0.2) x 10-6 molecules.photon-1 at 355 nm. (astrobiology.com)
  • Three types of analyses: generalized conventional spectroscopic analysis, statistical analysis, and hierarchical analysis, by which we aim to extract dynamical information from the complex spectrum of small polyatomic molecules are reviewed by referring to recent studies on vibrationally highly excited acetylene. (mit.edu)
  • Approximately 80 percent of the acetylene produced annually in the United States is used in chemical synthesis. (newworldencyclopedia.org)
  • This constitutes a serious limitation, in particular when considering that "classical" C-C bond formation is not adequate for the synthesis of quaternary centers containing an acetylene. (epfl.ch)
  • Some commercially useful acetylene compounds include acetylene black, which is used in certain dry-cell batteries, and acetylenic alcohols, which are used in the synthesis of vitamins. (voortrekker-history.co.za)
  • Trimethylsilyl)acetylene is used in the preparation of trimethylsilanyl-propiolic acid ethyl ester by reacting with carbonochloridic acid ethyl ester as well as in the synthesis of iodoalkenes by radical addition of perfluoroalkyl iodides. (alfa.com)
  • Synthesis routes of novel piperidine-containing acetylenes are presented. (diva-portal.org)
  • He was also able to form acetylene directly by combining pure hydrogen with carbon using electrical discharge of a carbon arc. (newworldencyclopedia.org)
  • All oxygen acetylene bottles wholesalers & oxygen acetylene bottles manufacturers come from members. (benadorassociates.com)
  • We doesn't provide oxygen acetylene bottles products or service, please contact them directly and verify their companies info carefully. (benadorassociates.com)
  • It is indicated that 1% Ru/N-AC exhibited good catalytic activity with an initial acetylene conversion of 95.2% at 250 °C, an EDC total liquid hourly space velocity (LHSV) of 0.2 h −1 and a molar ratio n (EDC)/ n (C 2 H 2 ) of 1, much better than that of 1% Ru/AC or N-AC. (rsc.org)
  • Acetylene was discovered in 1836 by Edmund Davy who identified it as a "new carburet of hydrogen. (newworldencyclopedia.org)
  • Berthelot also found acetylene was formed by sparking electricity through mixed cyanogen and hydrogen gases. (newworldencyclopedia.org)
  • What is Consuming Hydrogen and Acetylene on Titan? (nasa.gov)
  • Acetylene is also used in the acetylene ('carbide') lamp, once used by miners (not to be confused with the Davy lamp), on vintage cars , and still sometimes used by cavers. (newworldencyclopedia.org)
  • In this context, the acetylene is generated by dripping water from the upper chamber of the lamp onto calcium carbide (CaC 2 ) pellets in the base of the lamp. (newworldencyclopedia.org)
  • Acetylene was discovered in 1836, when Edmund Davy was experimenting with potassium carbide. (voortrekker-history.co.za)
  • It was found that the bonding of acetylene was significantly affected by the electronic and structural properties of the carbide surfaces. (osti.gov)
  • Because acetylene is so flammable and has a 29 PSI, it cannot be used in underwater applications or other applications that involve high pressure. (tech-faq.com)
  • Acetylene is colorless and extremely unstable in its pure form, which is why it is almost always mixed with other chemicals and handled as a solution. (tech-faq.com)
  • Section 8: Exposure Controls/Personal Protection Exposure Guidelines ACETYLENE, DISSOVED: ACETYLENE: ACGIH (simple asphyxiant) 2500 ppm (2662 mg/m3) NIOSH recommended ceiling Engineering Controls Handle only in fully enclosed systems or with adequate ventilation. (voortrekker-history.co.za)
  • The diagnostic is demonstrated by measuring acetylene formation during the shock-heated pyrolysis and oxidation of propene. (springer.com)
  • Despite many interesting and useful reactions of acetylenes with superbases the most amazing is the "contrathermodynamic" multipositional isomerization of the internal triple bond to the terminal position under the influence of alkali metal amides of ethylenediamine or 1,3-propylenediamine. (thefreedictionary.com)
  • Reactions of acetylenes with noble-metal halides. (alfa.com)
  • In addition to the well-established nucleophilic alkynylation, the use of electrophilic alkynes can expand tremendously the scope of acetylene transfer reactions. (epfl.ch)
  • The consecutive ion-molecule reactions in acetylene within the pressure limits of 0.00001 and 0.01 torr have been investigated as a function of the energy transferred to the acetylene molecule during the initial ionization by charge exchange with incident positive ions of low kinetic energy. (dtic.mil)
  • The synthetic potential of propargylic nitro compounds bearing free acetylenes was demonstrated by their transformation into propargylic triazoles, hydroxylamines and protected amines, as well as into allyl amines in good yield. (epfl.ch)
  • It has many applications including tanks and acetylene lighting tanks on old motorcycles. (troutunderground.com)
  • Acetylene is an unsaturated organic compound because its four atoms are triple bonded through a covalent bond . (newworldencyclopedia.org)
  • The team has probed the atomic-level workings of a metal-organic framework (MOF), a lattice-like structure made of copper oxide and benzene, that soaks up acetylene like a sponge. (scienceblog.com)
  • Exceptionally High Acetylene Uptake in a Microporous Metal - Organic Framework With Open Metal Sites. (scienceblog.com)
  • These images and movie show the distribution of the organic molecule acetylene at the north and south poles of Jupiter, based on data obtained by NASA's Cassini spacecraft in early January 2001. (nasa.gov)
  • The report generally describes 1-phenyl-2-(trimethylsilyl)-acetylene, examines its uses, production methods, patents. (marketpublishers.com)
  • 1-phenyl-2-(trimethylsilyl)-acetylene manufacturers and suppliers with contacts and product range are mentioned in the study. (marketpublishers.com)
  • Furthermore, 1-phenyl-2-(trimethylsilyl)-acetylene prices in regional markets can be found in the report with regards to countries and companies. (marketpublishers.com)
  • The report also focuses on 1-phenyl-2-(trimethylsilyl)-acetylene consumers by providing data on companies that use it. (marketpublishers.com)
  • However, the reverse approach (Umpolung of the reactivity) via an electrophilic acetylene synthon has been more rarely used. (epfl.ch)
  • Halogenoalkynes, hypervalent alkynyliodoniums, acetylene sulfones and in situ oxidized terminal acetylenes are the most often used reagents for electrophilic alkynylation. (epfl.ch)
  • For C-C bond formation, electrophilic acetylenes can be coupled with different organometallic reagents. (epfl.ch)
  • Ribet, J. and Drevon, J.-J. (1995) Phosphorus Deficiency Increases the Acetylene-Induced Decline in Nitrogenase Activity in Soybean (Glycine max (L.) Merr. (scirp.org)
  • A metal catalyzed click chemistry ligation process is employed to bind azides and terminal acetylenes to give triazoles. (freepatentsonline.com)
  • Our results indicate that the aerosols can act as activation centers to drive the photoreactivity of acetylene with the aerosols at the accretion interface at wavelengths where acetylene-ice alone does not show photoreactivity. (astrobiology.com)
  • Comparison and reliability of two non-invasive acetylene uptake techniques for the measurement of cardiac output. (biomedsearch.com)
  • Thirteen trained male cyclists performed CO2 rebreathing (CO2RB) at intensities from rest to 200 W, and open-circuit acetylene uptake (OpCirc) and single-breath acetylene uptake (SB) at intensities from rest to 300 W, with all procedures using 50 W increments. (biomedsearch.com)
  • There remains considerable debate over the active form of gold under operating conditions of a recently validated gold catalyst for acetylene hydrochlorination. (sciencemag.org)
  • The systematic name of this enzyme class is acetaldehyde hydro-lyase (acetylene-forming). (wikipedia.org)
  • Acetylene can also be manufactured by the partial combustion of methane with oxygen , or by the cracking of hydrocarbons . (newworldencyclopedia.org)
  • combustion of acetylene with oxygen produces a flame of over 3300 °C (6000 °F), releasing 11.8 kJ/g. (newworldencyclopedia.org)
  • Acetylene is an important combustion intermediate and plays a critical role in soot formation. (springer.com)
  • What is the balanced equation for the complete combustion of acetylene? (reference.com)
  • Acetylenes are versatile intermediates in chemistry, biochemistry and material sciences. (epfl.ch)
  • The principal raw materials for acetylene manufacture are calcium carbonate ( limestone ) and coal . (newworldencyclopedia.org)
  • F to form a hard porous mass suitable for containing dissolved acetylene gas solutions, comprising lime, crystalline silica, and a thickening agent selected from the group consisting of (a) polyethylene oxide, (b) amorphous glassy silica, (c) a soluble salt of phosphate and a soluble salt of calcium and (d) a soluble salt of phosphate and a neutralizing acid. (patentgenius.com)
  • Polymerization of acetylene with Ziegler-Natta catalysts produces polyacetylene films. (newworldencyclopedia.org)
  • Acetylene produces the third hottest natural chemical flame, after cyanogen (4525 degrees Celsius) and dicyanoacetylene (4990 degrees Celsius). (tech-faq.com)
  • An apparatus was designed that permitted acetylene reduction (N 2 fixation) by root nodules to be measured in situ simultaneously with net photosynthesis, dark respiration, and transpiration of the shoot in soybean plants ( Glycine max [L.] Merr. (plantphysiol.org)
  • acetylene-dicarboxylic acid manufacturers and suppliers with contacts and product range are mentioned in the study. (marketpublishers.com)
  • Among them, metal oxides have become important candidates for acetylene sensing due to their unique advantages-such as their small size and simplicity of integration-but they lack selectivity towards different gas species, and often require high operating temperatures and have high power consumption [ 16 , 17 , 18 , 19 , 20 ]. (mdpi.com)
  • A novel fluorine-containing telechelic polyimide end-capped with acetylene group which derived from 4,4-(hexafluoroisopropylidene) diphthalic anhydride (6FDA), 3,4-diaminodiphenyl ether (DADE), and 4-(2-phenylethynyl) phthalic anhydride (PEPA) was synthesized using polycondensation. (wiley.com)
  • A method of homopolymerizing the acetylene-substituted polyimide oligomers described in the U.S. Pat. (google.com)
  • Strongest vibrational band of acetylene near 13.7 μm is probed here to develop a highly sensitive absorption diagnostic. (springer.com)
  • The anharmonic interaction coupling terms known to occur from a pure vibrational fit in this acetylene isotopologue are included in the model. (osu.edu)
  • In the United States alone, several hundred thousand tons of acetylene are produced every year, but its volatility renders it difficult to transport: It becomes dangerously explosive at about 30 psi (207 kilopascal), only about twice normal atmospheric pressure. (scienceblog.com)
  • In our work, stable carboxyl-rich plasma polymers (COOH PPs) were deposited using plasma co-polymerization of maleic anhydride and acetylene at atmospheric pressure using dielectric barrier discharge (DBD). (muni.cz)
  • entitled "POLYMERIC MATERIAL MADE FROM SILOXANE-ACETYLENE POLYMER CONTAINING METAL-ACETYLENE COMPLEX," designated as NC 97,123, and filed on the same day as the present application is incorporated by reference. (google.com)
  • A comprehensive study of acetylene adsorption on δ-MoC(001), TiC(001) and ZrC(001) surfaces was carried out by means of calculations based on periodic density functional theory, using the Perdew-Burke-Ernzerhof exchange-correlation functional. (osti.gov)
  • The interaction of acetylene with the TiC(001) and ZrC(001) surfaces was strong (binding energies higher than $-$3.5 eV), while moderate acetylene adsorption energies were observed on δ-MoC(001) ($-$1.78 eV to -0.66 eV). (osti.gov)
  • The report provides a basic overview of the industry including definitions, classifications, applications and industry chain structure.The Acetylene market analysis is provided for the international markets including development trends, competitive landscape analysis, and key regions development status. (bharatbook.com)
  • Furthermore, there are several examples of natural products and drugs containing an acetylene group. (epfl.ch)
  • The excellent reactivity of this cyclic iodine reagent as alkynylation reagent led to the formation of free acetylene products even in the presence of sterically hindered ester groups. (epfl.ch)
  • This equipment burns a mixture of oxygen and acetylene, allowing a flame temperature of about 3300 degrees Celsius to be attained. (sciencephoto.com)
  • Acetylene is a colourless gas which burns with a very hot bright flame . (collinsdictionary.com)
  • This two-tank oxygen and acetylene cylinder cart includes a steel tank containment bar and a high rail design for stability while being moved around the jobsite. (unitedrentals.com)
  • Experiments are carried out behind reflected shock waves to measure absorption cross sections of acetylene near 730 cm −1 over a wide range of temperatures (1000-2200 K) and pressures (1-5 bar). (springer.com)
  • The acetylene sensing properties were investigated using different working temperatures and gas concentrations. (mdpi.com)