AcetyleneNitrogenase: An enzyme system that catalyzes the fixing of nitrogen in soil bacteria and blue-green algae (CYANOBACTERIA). EC 1.18.6.1.EthaneNitrogen Fixation: 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.Alkynes: Hydrocarbons with at least one triple bond in the linear portion, of the general formula Cn-H2n-2.Tungsten: 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.Azotobacter: 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.Nitrosomonas: 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.Hydrocarbons, Acyclic: Organic compounds composed exclusively of carbon and hydrogen where no carbon atoms join to form a ring structure.Ethylenes: Derivatives of ethylene, a simple organic gas of biological origin with many industrial and biological use.Molybdoferredoxin: 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.Nitrous Oxide: 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.Hydrogen: 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.Deltaproteobacteria: A group of PROTEOBACTERIA represented by morphologically diverse, anaerobic sulfidogens. Some members of this group are considered bacterial predators, having bacteriolytic properties.Oxidation-Reduction: 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).Azotobacter vinelandii: 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)Methane: 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)Molybdenum: 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)Spirillum: 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.PropaneAmmonia: 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.Nitrogen: 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.

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)

*Alkyne

... 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 ...

*Acetylene

The enzyme acetylene hydratase catalyzes the hydration of acetylene to give acetaldehyde. C2H2 + H2O → CH3CHO Acetylene is a ... Acetylene Production Plant and Detailed Process Acetylene at Chemistry Comes Alive! Acetylene, the Principles of Its Generation ... Pure acetylene is odorless, but commercial grades usually have a marked odor due to impurities. As an alkyne, acetylene is ... Since acetylene is a linear symmetrical molecule, it possesses the D∞h point group. At atmospheric pressure, acetylene cannot ...

*Acetylene hydratase

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 (album)

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 ...

*Bis(trimethylsilyl)acetylene

This compound is used as a surrogate for acetylene. BTMSA is prepared by treating acetylene with butyl lithium followed by ... Bis(trimethylsilyl)acetylene (BTMSA) is an organosilicon compound with the formula C2(Si(CH3)3)2. It is a colorless liquid that ... doi:10.1016/S0022-328X(00)89260-8 Curtain, M. L.; Wang, C. Bis(trimethylsilyl) acetylene. e-EROS. Rosenthal, U.; Burlakov, V. V ...

*Colt Acetylene Flash Lantern

The Colt Acetylene Flash Lantern (or Colt Field Signal Lamp) was a acetylene signal lamp produced by the J. B. Colt Company and ... A description from maneuvers at Fort Riley detailed the device: The Colt's acetylene flash lantern was employed for night ... 42-. Manual for Operation and Care of Colt Acetylene Flash Lantern. J.B. Colt Company. c. 1900. ...

*Kuwait Oxygen And Acetylene Company

... (KOAC) was founded in 1953 by the late Salim Al-Huneidi to manufacture oxygen and acetylene ...

*Alkynylation

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) ...

*Alkyne zipper reaction

Acetylene zipper. Exceptionally facile contrathermodynamic multipositional isomeriazation of alkynes with potassium 3- ...

*Hexatriynyl radical

Two different examples involve Argon gas and 1,3-butadiene in a mole ratio of 1500:1 Argon gas and acetylene in a mole ratio of ... The laboratory synthesis starts from acetylene C2H2. The reaction takes place within a DC discharge at reduced pressure in a ...

*Tetrabromoethane

"Acetylene tetrabromide". Immediately Dangerous to Life and Health Concentrations (IDLH). National Institute for Occupational ... acetylene tetrabromide) intoxication in man". American Industrial Hygiene Association. 30 (3): 251-256. doi:10.1080/ ...

*Cyclopropylacetylene

"CYCLOPROPYL ACETYLENE". chemicalland21.com. Retrieved 31 May 2017. Hudson, C.E.; Bauld, N.L. (1972). "Quantitative analysis of ...

*1,3-Diaminopropane

Acetylene zipper. Exceptionally facile contrathermodynamic multipositional isomeriazation of alkynes with potassium 3- ...

*Metalloprotein

ten Brink, Felix (2014). "Chapter 2. Living on acetylene. A Primordial Energy Source". In Kroneck, Peter M. H.; Sosa Torres, ...

*Dimethyl acetylenedicarboxylate

Sahoo, Manoj (2007). "Dimethyl Acetylene Dicarboxylate". Synlett. 2007: 2142. doi:10.1055/s-2007-984894. Bandrowski, E. (1877 ...

*List of English words of French origin (A-C)

acétique) acetylene, (Fr. acétylène) achieve, (Old Fr. achever) achievement, (Fr. achèvement) acid, (Fr. acide) aconite, (Fr. ...

*McKeen Motor Car Company

Lighting was originally acetylene. Most of the problems experienced with McKeen cars involved the powerplant and drivetrain. As ...

*Cyclooctatetraene

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]. Liebigs Ann. Chem. 560 (1): 1-92. ... 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 ...

*Calcium carbide

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 ... Locally produced acetylene is more economical than using imported oil. Production of calcium carbide in China has been ... The CaC2 content of the product is assayed by measuring the amount of acetylene produced on hydrolysis. As an example, the ...

*Peter Maitlis

232 citations Greaves, E. O.; Lock, C. J. L.; Maitlis, P. M. (1968). "Metal-Acetylene Complexes II. Acetylene Complexes of ... 223 citations Maitlis, P. M. (1976). "The Palladium(II)-Induced Oligomerization of Acetylenes: An Organometallic Detective ...

*Oldsmobile Model 20

The headlights used acetylene. A total of 6,575 Oldsmobile vehicles were manufactured in 1909, with 5,325 being the Model 20. ...

*Phenylacetaldehyde

Kunichika, Sango (1953). "Cyclopolyolefins Derived from Acetylene". Bulletin of the Institute for Chemical Research, Kyoto ...

*Ethylene oxide

Bredig, G.; Usoff, A. (1896). "Ist Acetylen ein Elektrolyt?" [Is acetylene an electrolyte?]. Zeitschrift für Elektrochemie. 3: ... which also contains acetylene and propane. Contrary to the isomerization, initiation of the chain occurs mainly as follows: ( ...

*Xtra (automobile)

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 ...

*Chloroprene

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". J. Am. Chem. Soc. 53 (11 ...
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 ...
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
Here we examined the impact of a commonly employed method used to measure nitrogen fixation, the acetylene reduction assay (ARA), on a marine sediment community. Historically, the ARA technique has been broadly employed for its ease of use, in spite of numerous known artifacts. To gauge the severity of these effects in a natural environment, we employed high-throughput sequencing to detect differences in acetylene-treated sediments versus non-treated control sediments after a seven hour incubation. Within this short time period, significant differences were seen broadly across all types of microbes identified in the sediment, implying that the changes induced by acetylene occur quickly. The results have important implications for our understanding of marine nitrogen budgets. Moreover, because the ARA technique has been widely used in terrestrial and freshwater habitats, these results may be applicable to other ecosystems.
Two series of amide-containing phenylacetylene macrocycles (PAMs) were prepared and self-assembled through a gelation process in an organic solvent. Their gelation properties along with their molecular arrangements in the xerogel state, their morphological features and their reactivity toward the topochemica
was a professional and depth research report on Global Acetylene black industry that you would know the worlds major regional market conditions of Acetylene black industry, the main region including North American, Europe and Asia etc, and the main country including United States ,Germany ,Japan and China etc.The report firstly introduced Acetylene black basic information including Acetylene
Nitrogen fixation was estimated by acetylene reduction assays for 21 soybean [Glycine max(L)Merr.] cultivars from five maturity groups. Some cultivars were studied for 2 or 3 years. Fixation by four cultivars was also estimated by the isotope dilution method and by comparing N accumulation to that of a nonnodulating cultivar. Nitrogen fixation was related to maturity group. Late maturing cultivars fixed more N2 than early maturing cultivars. Within maturity groups there was little variation in nitrogen fixing activity. During a season when N2 fixation was low, there was little agreement among three methods of measuring fixation. When available soil N was artifically reduced by amendment with carbohydrate, N2 fixation was higher and there was good correlation among the techniques used. The acetylene reduction assay gave lower values than the other two methods.. Please view the pdf by using the Full Text (PDF) link under View to the left.. Copyright © . . ...
Buy Carbon Black Acetylene Black Powder, Find Details include Size,Weight,Model and Width about Carbon Black Acetylene Black Powder. Make an Inquiry for Carbon Black Acetylene Black Powder at OKorder.com.
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
What can one say about acetylene that hasnt already been said millions of times before? Probably quite a bit because how many people talk about acetylene other than welders? Probably not a lot. Despite there being a lot of stuff to say about acetylene that hasnt already been said many times before, I dont know […]. ...
McNiel, R. E., and P. L. Carpenter. Nitrogen Fixation by Woody Plant Species as Measured by Acetylene Reduction Assay : Technical Paper. Publication FHWA/IN/JHRP-73/13. Joint Highway Research Project, Indiana Department of Transportation and Purdue University, West Lafayette, Indiana, 1973. https://doi.org/10.5703/1288284313852 ...
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
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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[116 Pages Report] Check for Discount on Global Acetylene Gas Market Professional Survey Report 2016 report by QYResearch Group. Notes: Production, means the output of Acetylene Gas Revenue, means...
Production of pure acetylene from a cracked gas obtained by cracking gaseous hydrocarbons, the process comprising a number of steps wherein the higher C3 to C5 hydrocarbons remaining in the crude acetylene are washed out with an organic solvent such as toluene.
Hi Guys. Back in the dim and distant past when just a sprog, I was taught that when preparing to use Oxy/Acetylene cylinders. You open both using the bottle key, so that either can be shut off in 1 quick movement. You should not have to reinsert the bottle key to close off the valve. Also that it was necessary to leave the bottle key in the Acetylene Cylinder. Because this was the catalyst and Oxygen will not burn on its own. With this in mind I asked our apprentice to set up the
Air/Acetylene Filter Assembly from PerkinElmer. An essential item from our extensive line of Air, Acetylene and Water Filters for 3100 Spectrometer.
Worker weld metal gratings by acetylene torch Stock Footage. csp9574718 - Worker in orange clothes weld metal gratings by acetylene torch. Affordable Royalty Free Stock Photography. Downloads for just $2.50, with thousands of images added daily. Subscriptions available for just $39.00. Our stock photo image search engine contains royalty free photos, vector clip art images, clipart illustrations.
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The report generally describes 1-phenyl-2-(trimethylsilyl)-acetylene, examines its uses, production methods, patents. 1-Phenyl-2-(trimethylsilyl)-acetylene
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 ...
Advances in technology have now made it possible to analyze cardiac output (Q) with only a single-breath, making measurements during exercise quicker and less invasive for the subject. Certain non-invasive techniques allow for measurement of the disappearance of a soluble inert gas as it diffuses across the blood-gas barrier in the lungs. The rate of disappearance of the gas is directly proportional to the flow of blood past the lungs and subsequently provides an estimate of pulmonary capillary blood flow (Qc), or Q. The SensorMedics® Corporation (Yorba Linda, CA) has developed a single-breath acetylene (C₂H₂) technique (SensorMedics Vmax 229TM), which includes a simple device to linearize expiratory flow rate by increasing the time by which the sensors can measure the disappearance of the marker gas and improve quantification. The purpose of this investigation was to determine the reproducibility of the C₂H₂ single-breath technique during ramping exercise testing with the addition of a ...
Gas Equipment Market by Industrial Gas (Atmospheric, Hydrogen, Acetylene, Helium), Type (Gas delivery, Regulators, Purifiers & filters, Flow devices, Gas generation, Cryogenics, Gas detection), Process - Market research report and industry analysis - 10039537
The migration of hydrogen atoms resulting in the isomerization of hydrocarbons is an important process which can occur on ultrafast timescales. Here, we visualize the light-induced hydrogen migration of acetylene to vinylidene in an ionic state using two synchronized 4 fs intense laser pulses. The first puls Ultrafast Imaging of Photochemical Dynamics
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.
The direct vinylation of an OH group in alcohols and phenols was carried out utilizing a novel CaC2/KF solid acetylene reagent in a simple K2CO3/KOH/DMSO system. The functionalization of a series of hydroxyl-group-containing substrates and the post-modification of biologically active molecules were successfu
Buy the Hardcover Book Acetylene Gas, Its Nature, Properties and Uses; Also Calcium Carbide, Its Composition, Properties… by George Frederick Thompson at Indigo.ca, Canadas largest bookstore. + Get Free Shipping on History books over $25!
The average acetylene plant operator salary in the United States is $38,747 or an equivalent hourly rate of $19. Salary estimates based on salary survey data collected directly from employers and anonymous employees in the United States
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
Page contains details about polypyrrole/nano-sulfur/PVDF/acetylene black composite . It has composition images, properties, Characterization methods, synthesis, applications and reference articles : nano.nature.com
(0386-0335) Extreme series standard torch kit for use with Air Acetylene. Includes (2) tips, gas regulator, hose, handle and B-tank key.
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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Looking for LYLE Danger No Smoking Sign,Acetylene,14x10 (34MJ29)? Graingers got your back. Price:$17.12. Easy ordering & convenient delivery. Log-in or register for your pricing.
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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.
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3R1A: Structural Analysis of Mammalian Cytochrome P450 2B4 Covalently Bound to the Mechanism-Based Inactivator tert-Butylphenylacetylene: Insight into Partial Enzymatic Activity.
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 ...
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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 ...
Inorganic Hypothesis: There are two theories of origin: Organic (bionic) or Inorganic (abionic). Early theories postulated an inorganic origin when it became apparent that there were widespread deposits of petroleum throughout the world. Dmitri Mendeleev (1877), a Russian and the father of the periodic table of elements, reasoned that metallic carbides deep within Earth reacted with water at high temperatures to form acetylene (C2H2) which subsequently condensed to form heavier hydrocarbons. This reaction is readily reproduced in the laboratory. Other hypotheses (Berthelot, 1860, Mendeleev, 1902) were a modification of the acetylene theory. They theorized that the mantle contained iron carbide which would react with percolating water to form methane: FeC2 + 2H2O = CH4 + FeO2 The problem was and still is the lack of evidence for the existence of iron carbide in the mantle. These theories are referred to as the deep-seated terrestrial hypothesis. Another inorganic hypothesis was suggested by ...
45] M.J. Frisch, G.W. Trucks, H.B. Schlegel, G.E. Scuseria, M.A. Robb, J.R. Cheeseman, V.G. Zakrzewski, J.A.Jr., Montgomery, R.E. Stratmann, J.C. Burant, S. Dapprich, J.M. Millam, A.D. Daniels, K.N. Kudin, M.C. Strain, O. Farkas, J. Tomasi, V. Barone, M. Cossi, R. Cammi, B. Mennucci, C. Pomelli, C. Adamo, S. Clifford, J. Ochterski, G.A. Petersson, P.Y. Ayala, Q. Cui, K. Morokuma, D.K. Malick, A.D. Rabuck, K. Raghavachari, J.B. Foresman, J. Cioslowski, J.V. Ortiz, B.B. Stefanov, G. Liu, A. Liashenko, P. Piskorz, I. Komaromi, R. Gomperts, R.L. Martin, D.J. Fox, T. Keith, M.A. Al-Laham, C.Y. Peng, A. Nanayakkara, C. Gonzalez, M. Challacombe, P.M.W. Gill, B. Johnson, W. Chen, M.W. Wong, J.L. Andres, M. Head-Gordon, E.S. Replogle and J.A. Pople: "Gaussian 98", In: Gaussian 98, Pittsburgh, PA, 1998 ...
NOTITLE__ =Examples of geometries using symmetry= Below are examples of the use of the SYMMETRY directive in the compound [[Release66:Geometry,GEOMETRY directive]]. The z axis is always the primary rotation axis. When in doubt about which axes and planes are used for the group elements, the keyword print may be added to the SYMMETRY directive to obtain this information. ==,math>C_{s},/math> methanol== The ,math>\sigma_h,/math> plane is the xy plane. geometry units angstroms C 0.11931097 -0.66334875 0.00000000 H 1.20599017 -0.87824237 0.00000000 H -0.32267592 -1.15740001 0.89812652 O -0.01716588 0.78143468 0.00000000 H -1.04379735 0.88169812 0.00000000 symmetry cs end ==,math>C_{2v},/math> water== The z axis is the ,math>C_2,/math> axis and the ,math>\sigma_v,/math> may be either the xz or the yz planes. geometry units au O 0.00000000 0.00000000 0.00000000 H 0.00000000 1.43042809 -1.10715266 symmetry group c2v end ==,math>D_{2h},/math> acetylene== Although acetylene has symmetry ,math>D_{\infty ...
Nanoscale molecular confinement substantially modifies the functionality and electronic properties of encapsulated molecules. Many works have approached this problem from the perspective of quantifying ground-state molecular changes, but little is kn
We focus on the best options for our clients. We generally encourage our clients to consider a range of potential buyers, both to enhance potential value and to understand the array of deal options. In this case, however, it was clear that the major multinational consolidators would recognize the most value in AOC and outbid other buyers. Thus, we counseled the family to engage in a more limited process and focus only on natural industry buyers. Praxair emerged as a very motivated buyer, offering to pay over 2x revenues, a significant premium to comparable deals in the industry. We were able to leverage the threat of other industry competitors to negotiate critical deal points and push the transaction to a quick closing ...
Every time you use oxygen-acetylene equipment, if certain safety guidelines are not followed, it is the same as handling live explosives ready to go off…….
Jon Silkins most recent books are Collected Poems and a collection of verse, The Psalms and their Spoils. He is co-editor of Stand.. ...
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Propane wont give you as much heat. Technically it wont weld, just braze, which is all most farmers/home shop welders do anyway. You will need new c
Arc-Zone.com 70º Scorpion 6300 Victor® Style Cutting Torch - Acetylene [FLT-6300-A70] - FLT-6300-A70 Flame Techs Heavy Duty, Victor® Style Cutting Torch With 70º Head, For Use With Acetylene. This torch is available in several standard lengths from 18 (.457m) to 36 (.914m). Custom length torches can be built-to-order. Select the Torch Length Using the Drop-Down Menu Above. Torch includes a replaceable set of check valves. Standard B size
Rates of N2 fixation can be measured by a number of techniques to address questions of nodule efficiency and nitrogen cycling in agricultural and natural plant systems. Nitrogenase is pivotal for initial reduction of N2 but this same enzyme will also reduce acetylene (C2H2) to ethylene (C2H4).
How about Carbeurator jets? You could either go large with a set from "Holley" or go small with mikuni 2-Stroke carbs? Use an electric fuel pump for injected engines (high Pressure) and run the BD through steel or braided stainless fuel line. Try http://www.Jegs.com or http://www.Summitracing.com for all kinds of fuel pump jet/nozzle accessories. We are pumping fuel here so instead of modifying items that are not designed to do what you want, just get the items that have millions of dollars in engineering already done to produce your desired results. I am not trying to be a weiner here, but as I started reading this thread that is the first thing that came to mind. If you need smaller diameters than fuel jetting provides, take a look at some torch tips for Ox/acetylene torches. hell most even come with tip-cleaners, the are already threaded in NPT so there leak proof. Maybe even look into "NOS Systems" they are a Nitrous oxide kit company they have almost anything you could ever want for this ...
Benzofurazane has been attached to nucleosides and dNTPs, either directly or through an acetylene linker, as a new redox label for electrochemical analysis of nucleotide sequences. Primer extension incorporation of the benzofurazane-modified dNTPs by polymerases has been developed for the construction of labeled oligonucleotide probes. In combination with nitrophenyl and aminophenyl labels, we have successfully developed a three-potential coding of DNA bases and have explored the relevant electrochemical potentials. The combination of benzofurazane and nitrophenyl reducible labels has proved to be excellent for ratiometric analysis of nucleotide sequences and is suitable for bioanalytical applications.. ...
senior author, undergraduate co authors underlined). 41. E. M. Harcourt , D. E. Lynch and Darren G. Hamilton.* Bis(2-thienyl)acetylene. Acta Crystallographica Section E 2009, E65, o2484.. http://journals.iucr.org/e/issues/2009/10/00/zs2008/index.html. 40. C. A. Gondo, D. E. Lynch and Darren G. Hamilton.* N, N-Bis(1-acetylcyclohexyl)-1,8:4,5-naphthalenetetracarboximide. Acta Crystallographica Section E 2009, E65, o2184.. http://journals.iucr.org/e/issues/2009/09/00/zs2005/index.html. 39. C. A. Gondo, D. E. Lynch and Darren G. Hamilton.* N, N-Bis(1-ethynylcyclohexyl)pyromellitic diimide. Acta Crystallographica Section E 2009, E65, o2122.. http://journals.iucr.org/e/issues/2009/09/00/zs2003/index.html. 38. A. M. Cagulada and Darren G. Hamilton.* An Approach to Thermodynamically Controlled Supramolecular Assembly Possessing an Integral Locking Mechanism. The Journal of the American Chemical Society 2009, 131, 902-903.. http://pubs.acs.org/doi/abs/10.1021/ja808162b. 37. A. M. Cagulada, D. E. Lynch ...
Designed for acetylene use only. This traditional rosebud with gooseneck keeps you away from the heat. Fits Harris E-43, D-85, H-16-2E, & W-2030 mixers.
The effects of Bradyrhizobium (strains NC92 and TAL1000) and Fe supply on nodulation and nitrogen fixation of two peanut (Arachis hypogaea L.) cultivars (cv. Tainan 9 (Fe inefficient) and cv. 71-234 (Fe efficient)) grown under Fe deficient conditions (imposed by adding 40% CaCO3 to a ferruginous soil) were examined in a glasshouse experiment. When inoculated with TAL1000 without Fe, both cultivars had low shoot N concentration, very low nodule numbers and weight and no measurable acetylene reduction activity per plant. Inoculation with NC92 without Fe increased all these parameters substantially; addition of Fe with NC92 had no further effect on N concentration but doubled nodule number, weight and acetylene reduction activity per plant. Addition of Fe with TAL1000 increased all parameters to the same level as Fe+NC92, indicating that the poorer nodulation and N2 fixation of TAL1000 in the absence of Fe, resulted from a poorer ability in getting its Fe supply from the alkaline soil. The nodules ...
BIS(TRIMETHYLSTANNYL)ACETYLENE 2117-50-2 safety info, BIS(TRIMETHYLSTANNYL)ACETYLENE chemical safety search, Chemical BIS(TRIMETHYLSTANNYL)ACETYLENE safety technical specifications ect.
Intratec Solutions LLC, leading provider of chemicals and utilities pricing data and production cost reports, is pleased to announce a new report examining the costs of production of Acetaldehyde (also known as Ethanal, Acetic Aldehyde and Ethyl Aldehyde).. The report presents an up-to-date, detailed cost analysis of Acetaldehyde production from acetylene. The process examined is a typical vapor phase acetylene hydration over solid catalyst.. The study may be extended with optional analyses, such as Economic Analysis for Different Capacities, Process Flow Diagrams & Equipment List, and analyses providing capital & production costs in several countries.. The new study is now part of Intratec portfolio of more than 900 up-to-date, independent and cost-effective reports. Intratec studies can be purchased online at Intratec website, via credit cards.. The content of the new report can be checked at www.intratec.us/analysis/acetaldehyde-e32a. For other Intratec reports focused on the costs of ...
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* ...
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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 ...
Stock video footage MOSCOW - SEPTEMBER 27: Worker weld metal gratings by acetylene torch, September 27, 2010 in Moscow, Russia. In 2010, in Moscow there are about 1800 construction companies. 00:00:19 ...
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 ...
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.
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 ...
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. ...
In this course students will carry out experiments in the field of inorganic and physical chemistry and write journal-style reports on basis of their results. In the first half of the semester students will conduct a multi-step synthesis and characterization of a Mo-Mo complex with a quadruple bond. Students will use a glove box for the synthesis under inert atmosphere. The synthesized Mo-Mo complex will be identified and characterized by spectroscopy (UV-vis, IR, 1H and 31P NMR) and electrochemistry (cyclic voltammetry). In the second half of the semester students will conduct two physical chemistry experiments. First students will obtain the high-resolution IR spectra of acetylene and deuterated acetylene and analyze the rotation-vibration spectra using statistical and quantum mechanics to obtain structural data. Finally, students will carry out a kinetic study of the isomerization of the Mo-Mo Mo (alpha to beta or beta to alpha) complex by UV-vis spectroscopy. (CHEM 0311 and CHEM 0351 and ...
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.
Permissions: This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 License. Please contact [email protected] to use this work in a way not covered by the license.. For more information, read Michigan Publishings access and usage policy.. ...
The CIDG chief said that most of those arrested were facing charges of murder, rape, robbery and illegal possession of firearms in courts.. He also said that one of the significant accomplishments of the CIDG teams involved the arrest of Junie Bataluna, an escapee from the Misamis Oriental provincial jail in Cagayan de Oro City in 2011.. Bataluna was apprehended due to a warrant of arrest for murder issued by Judge Florencia D. Sealana-Abbu of the Cagayan de Oro Regional Trial Court (RTC) Branch 17.. During the arrest, the accused fired his gun at the arresting team, forcing the lawmen to retaliate and eventually causing Batalunas death.. Recovered from the suspects possession was one caliber .38 revolver loaded with live ammunition and three pieces of fired cartridge caliber .38 cartridge.. Last Saturday, the CIDG apprehended Requino Dacmec in his residence at P-2, Barangay Gayong, Cordon, Isabela.. Dacmeg is a member of the Julio Bedking Acetylene Group and Peter Sumedca Acetylene Group ...
the diatomic species C2 does exist by itself in vacuum. The two carbons are identical, so one cannot be more positive than the other more negative, so the bond cannot be ionic. It is a covalent bond, in fact a very strong one: a triple bond, just like the triple bond in a molecule of acetylene gas ( C2H2: H-C=C-H ). But C2 is not stable, it wants to bond to the other C2s in the neighborhood and make C4, C6, C8, C60 buckyballs, nanotubes, graphene sheets, graphite, soot, whatever. And if it was in air it would grab the nearest oxygen molecule and react right away and start a fire. Scientists call C2 a "radical". That is an un-finished molecule, a half-a-molecule, that has broken bonds facing outward, looking to bond with something else. Each Carbon atom likes to have 4 bonds, and the other carbon in C2 can only reach 3 of them. The 4th sticks out in the opposite side of each carbon, into empty space. So you cannot get any C2 in a container or handle it. With the right instruments, scientists can ...
Synonyms for alkyne in Free Thesaurus. Antonyms for alkyne. 2 synonyms for alkyne: acetylene, ethyne. What are synonyms for alkyne?
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 ...
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 ...
[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 ...
Hola, vendo los siguientes cds a 4€ cada uno: ...And Oceans - A.M.G.O.D. Ab:Norm - Incide Acetylene - Elements of Insanity Acheron - Tribute to the Devils Mu
The new Explosives Regulations 2014 (ER 2014) and the Acetylene Safety (England and Wales and Scotland) Regulations 2014 (ASR 2014) will come into force on 1 October 2014.
Nitrogenases are vitally important enzymes that perform an amazing chemical reaction, the reduction of N2 to ammonia. In nitrogenases, iron-sulfur clusters cata...
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. The reactions of the molecular ion in the ground electronic state pi(u)(-1) are distinguished from those of the molecular ion in an excited electronic state sigma(g)(-1). The various chain sequences of reaction, including those involving ions with uneven numbers of carbon atoms, are elucidated, and numerous reactions proposed by earlier workers are shown to be unimportant in the pressure range investigated. Rate constants are calculated for the various ion-molecule reactions. (Author)(*ALKYNES
Cyanobacteria produce a range of secondary metabolites, one being the neurotoxic non-protein amino acid β-N-methylamino-L-alanine (BMAA), proposed to be a causative agent of human neurodegeneration. As for most cyanotoxins, the function of BMAA in cyanobacteria is unknown. Here, we examined the effects of BMAA on the physiology of the filamentous nitrogen-fixing cyanobacterium Nostoc sp. PCC 7120. Our data show that exogenously applied BMAA rapidly inhibits nitrogenase activity (acetylene reduction assay), even at micromolar concentrations, and that the inhibition was considerably more severe than that induced by combined nitrogen sources and most other amino acids. BMAA also caused growth arrest and massive cellular glycogen accumulation, as observed by electron microscopy. With nitrogen fixation being a process highly sensitive to oxygen species we propose that the BMAA effects found here may be related to the production of reactive oxygen species, as reported for other organisms.
Carbon nanotubes and graphene have many interesting properties. To exploit the properties in applications their synthesis and incorporation in devices has to be understood and controlled. This thesis is based on experimental studies on synthesis of carbon nanotubes and fabrication of nanoelectromechanical systems from carbon nanotubes and graphene. Vertically aligned nanotube arrays with heights over 800 µm have been grown using acetylene with iron as catalyst on alumina support using thermal chemical vapor deposition. By varying the partial pressure of acetylene it was found that the addition-rate of carbon was proportional to the coverage of acetylene molecules on the catalyst nanoparticle. In certain conditions the macroscopic pattern of the catalyst areas influenced the microscopic properties of the carbon nanotubes. It was shown that the initial carbon-precursor flow conditions could determine the number of walls produced. The amount of carbon incorporated into nanotubes was constant but ...
A novel strategy to obtain side chain modified poly(oxindole biphenylylene) (POXI) by photoinduced copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) click reaction is described. In the first step, an alkyne-functionalized poly(oxindolebiphenylylene) (POXI-alkyne) is synthesized by superacid-catalyzed condensation of isatin with aromatic hydrocarbons. Subsequently, poly(ethylene glycol) methyl ether (Me-PEG), 1-pyrenemethanol (Py-OH) and 1,3-dibromopropane (DBP) are functionalized by azide groups via simple nucleophilic substitution reaction. Visible-light-induced CuAAC reaction between POXI-alkyne and the corresponding azide functionalized click components employing dibenzoyldiethylgermane (DBDEG) as photoactivator resulted in the formation of POXI-PEG, POXI-Py and insoluble network, respectively. Successful modification of POXI was confirmed by the spectral, (1H NMR, FT-IR, Fluorescence), chromatographic (GPC) and thermal (DSC) investigations ...
We report the discovery and spread of a dwarf ecotype of Spartina alterniflora in San Francisco Bay. Relative to typical S. alterniflora, this dwarf ecotype has one-fifth the tiller height (~21 cm), tenfold the tiller density (~4000 tillers/m²), and is restricted to growth in the upper intertidal zone. Chromosome counts of the dwarfs are identical to typical smooth cordgrass (2n = 62), and smooth cordgrass-specific random amplified DNA markers confirm the species identity of the dwarf. Field-collected clonal fragments of the dwarf grown for 2 yr under high-nutrient conditions maintained the dwarf syndrome, as did plants grown from the seed of a dwarf. The dwarf condition is not caused by endophytic fungi. The first dwarf smooth cordgrass patch was discovered in 1991, and by 1996 five separate dwarf patches had appeared within 200 m of the original. Since 1991, total area covered by the dwarf ecotype has increased sixfold to 140 m². The ecological range of the dwarf smooth cordgrass ecotype is ...
Studies were undertaken to characterize the symbiosis between an uncultivated legume, Vicia cracca L., and a strain of Rhizobium bacteria isolated from its root nodules. -- Root nodules were found to be elongate and often branched at maturity. Tritiated-thymidine incorporation studies, monitored by autoradiography, indicated that nodules develop from an apically-located meristem. Nitrogen fixation, measured by acetylene reduction, occurred at rates commensurate with values reported for other legumes. Vicia cracca seeds and plants are small and can be conveniently cultured in vitro but a rigorous scarification procedure, immersion in concentrated sulfuric acid, was required to produce appreciable germination rates. Sulfuric acid simultaneously carified and surface-sterilized Vicia cracca seeds. This permitted nodulation of V. cracca, by selected Rhizobium strains, to be conveniently studied. -- The Rhizobium isolate, referred to as R. sp. VC 2, was identified as a wild strain of Rhizobium ...
Rhodopseudomonas viridis grows by means of nitrogen fixation under anaerobic, photosynthetic conditions. In batch culture, nitrogenase activity was highest at early-logarithmic phase, lower during mid- to late-logarithmic phase, and nearly zero during stationary phase. Nitrogen-fixing cells were morphologically and ultrastructurally similar to non-nitrogen-fixing cells as determined by electron microscopy. Electron spin resonance (esr) spectroscopy of nitrogen-fixing whole cells yielded g4.26 and g3.66 signals indicating the presence of nitrogenase molybdenum-iron (MoFe) protein. Ammonia switch-off occurred upon addition of 0.2 mM NH(,4)Cl, however, nitrogenase activity did not reappear for nearly four hours. Esr spectroscopy of whole cell multilayers (WCM) of Azotobacter vinelandii and Rhodospirillum rubrum was used to detect structural associations between nitrogenase MoFe protein and cell membrane. Conditions were defined for observing MoFe protein esr signals in whole cell preparations of each
Graphene, an allotrope of carbon, discovered more than a decade ago has led to myriad research that seeks to unlock its vast potential. Zeolites, commonly used microporous solid catalysts in the petrochemical industry, have recently attracted attention in the field of material science as a template for carbon synthesis. Each individual crystal is distinguished by its unique 1 nanometer (nm) sized pore structure, this structure facilitates the accommodation of carbon nanotubes inside the zeolite. On paper, these nanoporous systems are an ideal template for the synthesis of three-dimensional (3D) graphene architecture but the zeolite pores are too small to accommodate bulky molecular compounds like polyaromatic and furfuryl alcohol that are often used in carbon synthesis. Small molecules like ethylene and acetylene can be used as a carbon source to achieve successful carbonization within the zeolite pores, but it comes at a great cost. The high temperatures required for the synthesis cause the ...

Alkyne synonyms, alkyne antonyms - FreeThesaurus.comAlkyne synonyms, alkyne antonyms - FreeThesaurus.com

2 synonyms for alkyne: acetylene, ethyne. What are synonyms for alkyne? ... acetylene,type:2},{name:ethyne,type:2},{name:aliphatic compound,type:4},{name:oxyacetylene,type:4}]},/ ...
more infohttps://www.freethesaurus.com/alkyne

Acetylene | Encyclopedia.comAcetylene | Encyclopedia.com

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 ...
more infohttps://www.encyclopedia.com/science-and-technology/chemistry/organic-chemistry/acetylene

AcetyleneAcetylene

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 ...
more infohttps://webbook.nist.gov/cgi/inchi?ID=C74862&Mask=200

AcetyleneAcetylene

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 ...
more infohttps://webbook.nist.gov/cgi/cbook.cgi?Source=1981ROS%2FBOT71&Units=CAL&Mask=20

Oxy-Acetylene Techniques | SpringerLinkOxy-Acetylene Techniques | SpringerLink

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 ...
more infohttps://link.springer.com/chapter/10.1007/978-1-349-02818-4_3

Acetylene - New World EncyclopediaAcetylene - New World Encyclopedia

... 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 ...
more infohttps://www.newworldencyclopedia.org/entry/Acetylene

CDC - NIOSH Pocket Guide to Chemical Hazards -
Methyl acetyleneCDC - NIOSH Pocket Guide to Chemical Hazards - Methyl acetylene

APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus. Escape: ...
more infohttps://www.cdc.gov/niosh/npg/npgd0392.html

The Practical Utilization of Acetylene Gas - Scientific AmericanThe Practical Utilization of Acetylene Gas - Scientific American

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.
more infohttps://www.scientificamerican.com/article/the-practical-utilization-of-acetylene-gas/?error=cookies_not_supported&code=bed8e090-4871-4612-93d6-ed8c6669253d

A mid-infrared absorption diagnostic for acetylene detection | SpringerLinkA mid-infrared absorption diagnostic for acetylene detection | SpringerLink

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 ...
more infohttps://link.springer.com/article/10.1007%2Fs00340-015-6125-x

NASA - 
What is Consuming Hydrogen and Acetylene on Titan?NASA - What is Consuming Hydrogen and Acetylene on Titan?

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, ...
more infohttps://www.nasa.gov/topics/solarsystem/features/titan20100603.html

Acetylene - Chemical production and investment cost | IHS MarkitAcetylene - Chemical production and investment cost | IHS Markit

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 ...
more infohttps://www.ihs.com/ja/products/chemical-technology-pep-acetylene-1981.html

Federal Register
       :: 
      Revising Standards Referenced in the Acetylene StandardFederal Register :: Revising Standards Referenced in the Acetylene Standard

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 ...
more infohttps://www.federalregister.gov/documents/2009/11/10/E9-27004/revising-standards-referenced-in-the-acetylene-standard

Acetylene - WikipediaAcetylene - Wikipedia

The enzyme acetylene hydratase catalyzes the hydration of acetylene to give acetaldehyde. C2H2 + H2O → CH3CHO Acetylene is a ... Acetylene Production Plant and Detailed Process Acetylene at Chemistry Comes Alive! Acetylene, the Principles of Its Generation ... Pure acetylene is odorless, but commercial grades usually have a marked odor due to impurities. As an alkyne, acetylene is ... Since acetylene is a linear symmetrical molecule, it possesses the D∞h point group. At atmospheric pressure, acetylene cannot ...
more infohttps://en.wikipedia.org/wiki/Acetylene

Smith Single-Stage Acetylene Regulator for B TanksSmith Single-Stage Acetylene Regulator for 'B' Tanks

Regulator: acetylene. • Tank type: B. • CGA tank connection: 520. • Dual or Single stage: single. • Number of gauges: two. • ...
more infohttps://www.riogrande.com/Product/Smith-Single-Stage-Acetylene-Regulator-for-B-Tanks/500128?pos=1

Oxygen and Acetylene bottlesOxygen and Acetylene bottles

I have an oxy-acetylene tank for my mig welder but havent done anything with a cutting torch. Do these tanks stay good or do ... We had a renter leave behind a couple of the large bottles of oxygen and a somewhat smaller acetylene tank at a rent house. ... Re: Oxygen and Acetylene bottles Airgas and other large outfits wont mess with customer owned bottles because they will lose ... Re: Oxygen and Acetylene bottles All tanks need to be certified. There are numbers stamped near the top of tank. Post a pic and ...
more infohttp://weldingweb.com/showthread.php?700221-Oxygen-and-Acetylene-bottles&s=2ff0c43823d75310f32eb839f7fc736b&p=8610076

Global Acetylene Industry 2015 Market Research RepGlobal Acetylene Industry 2015 Market Research Rep

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 ...
more infohttps://www.bharatbook.com/materials-chemicals-market-research-reports-640557/global-acetylene.html

New Acetylene Chemistry - InfoscienceNew Acetylene Chemistry - Infoscience

Acetylenes are versatile intermediates in chemistry, biochemistry and material sciences. The functionalization of alkynes by ... The developed reaction conditions led to high yields of unprotected acetylenes with cyclic, nitro and linear keto esters as ... However, the reverse approach (Umpolung of the reactivity) via an electrophilic acetylene synthon has been more rarely used. ... Furthermore, there are several examples of natural products and drugs containing an acetylene group. Usually, they are ...
more infohttps://infoscience.epfl.ch/record/168988

Bis(trimethylsilyl)acetylene, 99%, ACROS Organics™Bis(trimethylsilyl)acetylene, 99%, ACROS Organics™

bis trimethylsilyl acetylene, silane, 1,2-ethynediylbis trimethyl, 1,2-bis trimethylsilyl ethyne, btmsa, 1,2-bis- ... bis trimethylsilyl acetylene, silane, 1,2-ethynediylbis trimethyl, 1,2-bis trimethylsilyl ethyne, btmsa, 1,2-bis- ...
more infohttps://www.fishersci.ca/shop/products/bis-trimethylsilyl-acetylene-99-acros-organics/AC182010500

Air/Acetylene Filter Assembly | PerkinElmerAir/Acetylene Filter Assembly | PerkinElmer

An essential item from our extensive line of Air, Acetylene and Water Filters for 3100 Spectrometer. ... Includes filters for both compressed air and acetylene.. *Two-stage, high-efficiency coalescing filter system removes oil, ... Removes particulate and acetone droplets from acetylene to 99.99% at 0.1 micron protecting your microcomputer gas controls and ...
more infohttps://www.perkinelmer.com/product/air-acetylene-filter-assy-n9301398

Acetylene hydratase - WikipediaAcetylene hydratase - Wikipedia

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 ...
more infohttps://en.wikipedia.org/wiki/Acetylene_hydratase

Chemical Database: Methyl acetylene-propadine mixture (EnvironmentalChemistry.com)Chemical Database: Methyl acetylene-propadine mixture (EnvironmentalChemistry.com)

This page contains information on the chemical Methyl acetylene-propadine mixture including: 19 synonyms/identifiers; U.S. Code ... Methyl acetylene and propadiene mixtures, stabilized [UN1060] [Flammable gas]*Methyl acetylene-allene mixture*Methyl acetylene- ... Methyl acetylene-propadine mixture*Propadiene mixed with methyl acetylene*Propadiene-methyl acetylene*Propyne, mixed with ... Propadiene mixed with methyl acetylene, see Methyl acetylene and propadiene mixtures, stabilized. Forbid. Forbid. ...
more infohttps://environmentalchemistry.com/yogi/chemicals/cn/Methyl%A0acetylene-propadine%A0mixture.html

Acetylene Oxygen Co Inc in Houston, TX 77092 - ChamberofCommerce.comAcetylene Oxygen Co Inc in Houston, TX 77092 - ChamberofCommerce.com

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Acetylene vessel filler composition - Patent # 4129450 - PatentGeniusAcetylene vessel filler composition - Patent # 4129450 - PatentGenius

F to form a hard porous mass suitable for containing dissolved acetylene gas solutions, comprising lime, crystalline silica, ... In conventional practice, acetylene gas is commonly stored in the form of a dissolved acetylene gas solution, as for example in ... A method of forming a hard porous mass suitable for containing dissolved acetylene gas solutions, comprising the steps of:. (a ... A method of forming a hard porous mass suitable for containing dissolved acetylene gas solutions, comprising the steps of:. (a ...
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  • 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 mercuric chloride catalyst for acetylene hydrochlorination creates vinyl chloride, an important polymer feedstock. (sciencemag.org)
  • For safety reasons, the pressure in acetylene tanks must be carefully controlled and kept below a certain point, highlighting the tempestuous nature of the industrial and highly functional substance. (gasworld.com)
  • Southwest Industrial Gases, suppliers of acetylene and other gases, experienced the hazardous explosions in July which rocked an area along the Trinity River zoned for industrial manufacturing. (gasworld.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 sublimation point at atmospheric pressure is −84.0 °C. The adiabatic flame temperature in air at atmospheric pressure is 2534 °C.[citation needed] Acetylene gas can be dissolved in acetone or dimethylformamide in room temperature and 1 atm. (wikipedia.org)
  • Removes particulate and acetone droplets from acetylene to 99.99% at 0.1 micron protecting your microcomputer gas controls and AA burner system from contamination and corrosion. (perkinelmer.com)
  • 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)
  • 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)
  • Until the 1950s, when oil supplanted coal as the chief source of reduced carbon, acetylene (and the aromatic fraction from coal tar) was the main source of organic chemicals in the chemical industry. (wikipedia.org)
  • 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)
  • 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)
  • Acetylene is an unsaturated organic compound because its four atoms are triple bonded through a covalent bond . (newworldencyclopedia.org)
  • 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 principal raw materials for acetylene manufacture are calcium carbonate ( limestone ) and coal . (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)
  • 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)
  • Acetylenes are versatile intermediates in chemistry, biochemistry and material sciences. (epfl.ch)
  • 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)
  • Harvey, John COUP D'ETAT ( 1999 ) "The bar had its own interior light, a small acetylene lamp. (collinsdictionary.com)
  • and I was wondering if acetylene-air is adequate for brazing a frame. (bikeforums.net)
  • 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)
  • Upstream raw materials and equipment and downstream demand analysis is also carried out.The Acetylene industry development trends and marketing channels are analyzed. (bharatbook.com)
  • Another paper online now in the Journal of Geophysical Research maps hydrocarbons on the Titan surface and finds a lack of acetylene. (nasa.gov)
  • This lack of acetylene is important because that chemical would likely be the best energy source for a methane-based life on Titan, said Chris McKay, an astrobiologist at NASA Ames Research Center, Moffett Field, Calif., who proposed a set of conditions necessary for this kind of methane-based life on Titan in 2005. (nasa.gov)
  • 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)
  • Approximately 80 percent of the acetylene produced annually in the United States is used in chemical synthesis. (newworldencyclopedia.org)
  • citation needed] Since acetylene has a pKa of 25, acetylene can be deprotonated by a superbase to form an acetylide: HC≡CH + RM → RH + HC≡CM Various organometallic and inorganic reagents are effective. (wikipedia.org)
  • The mechanism is thought to involve attachment of acetylene to the metal followed by nucleophilic attack of water. (wikipedia.org)
  • It catalyzes the hydration of acetylene to give acetaldehyde: C2H2 + H2O → CH3CHO The W centre is bound to two molybdopterin cofactors. (wikipedia.org)
  • Acetylene Good Practices Promoting a duty of care with concrete safety guidelines. (boconline.co.uk)
  • The Global Acetylene Industry 2015 Market Research Report is a professional and in-depth study on the current state of the Acetylene industry. (bharatbook.com)
  • I have an oxy-acetylene tank for my mig welder but haven't done anything with a cutting torch. (weldingweb.com)