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.Cell Adhesion Molecules: Surface ligands, usually glycoproteins, that mediate cell-to-cell adhesion. Their functions include the assembly and interconnection of various vertebrate systems, as well as maintenance of tissue integration, wound healing, morphogenic movements, cellular migrations, and metastasis.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).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.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.Deltaproteobacteria: A group of PROTEOBACTERIA represented by morphologically diverse, anaerobic sulfidogens. Some members of this group are considered bacterial predators, having bacteriolytic properties.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)Molecular Sequence Data: Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories.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.Kinetics: The rate dynamics in chemical or physical systems.Oxygen Compounds: Inorganic compounds that contain oxygen as an integral part of the molecule.Deuterium Exchange Measurement: A research technique to measure solvent exposed regions of molecules that is used to provide insight about PROTEIN CONFORMATION.Saturn: The sixth planet in order from the sun. It is one of the five outer planets of the solar system. Its twelve natural satellites include Phoebe and Titan.Mass Spectrometry: An analytical method used in determining the identity of a chemical based on its mass using mass analyzers/mass spectrometers.Textbooks as Topic: Books used in the study of a subject that contain a systematic presentation of the principles and vocabulary of a subject.Stevens-Johnson Syndrome: Rare cutaneous eruption characterized by extensive KERATINOCYTE apoptosis resulting in skin detachment with mucosal involvement. It is often provoked by the use of drugs (e.g., antibiotics and anticonvulsants) or associated with PNEUMONIA, MYCOPLASMA. It is considered a continuum of Toxic Epidermal Necrolysis.Carbon Compounds, Inorganic: Inorganic compounds that contain carbon as an integral part of the molecule but are not derived from hydrocarbons.Silicon Compounds: Inorganic compounds that contain silicon as an integral part of the molecule.Water: A clear, odorless, tasteless liquid that is essential for most animal and plant life and is an excellent solvent for many substances. The chemical formula is hydrogen oxide (H2O). (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)TextbooksSpectrum Analysis, Raman: Analysis of the intensity of Raman scattering of monochromatic light as a function of frequency of the scattered light.Postmodernism: A late 20th-century philosophical approach or style of cultural analysis that seeks to reveal the cultural or social construction of concepts conventionally assumed to be natural or universal. (from E.R. DuBose, The Illusion of Trust: Toward a Medical Theological Ethics in the Postmodern Age, Kluwer, 1995)Vibration: A continuing periodic change in displacement with respect to a fixed reference. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)Spectroscopy, Fourier Transform Infrared: A spectroscopic technique in which a range of wavelengths is presented simultaneously with an interferometer and the spectrum is mathematically derived from the pattern thus obtained.Raffinose: A trisaccharide occurring in Australian manna (from Eucalyptus spp, Myrtaceae) and in cottonseed meal.Peptide Termination Factors: Proteins that are involved in the peptide chain termination reaction (PEPTIDE CHAIN TERMINATION, TRANSLATIONAL) on RIBOSOMES. They include codon-specific class-I release factors, which recognize stop signals (TERMINATOR CODON) in the MESSENGER RNA; and codon-nonspecific class-II release factors.Earth Sciences: Fields of science encompassing studies and research from the disciplines of PHYSICS; CHEMISTRY; BIOLOGICAL SCIENCES; and MATHEMATICS; that are related to the planet EARTH. Subfields include atmospheric chemistry; CLIMATOLOGY; ENVIRONMENTAL SCIENCES; GEOGRAPHY; GEOLOGY; geophysics; METEOROLOGY; OCEANOGRAPHY; PALEONTOLOGY; mineralogy; and seismology.Science: The study of natural phenomena by observation, measurement, and experimentation.Physics: The study of those aspects of energy and matter in terms of elementary principles and laws. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)Internet: A loose confederation of computer communication networks around the world. The networks that make up the Internet are connected through several backbone networks. The Internet grew out of the US Government ARPAnet project and was designed to facilitate information exchange.Nucleic Acids: High molecular weight polymers containing a mixture of purine and pyrimidine nucleotides chained together by ribose or deoxyribose linkages.Biopolymers: Polymers synthesized by living organisms. They play a role in the formation of macromolecular structures and are synthesized via the covalent linkage of biological molecules, especially AMINO ACIDS; NUCLEOTIDES; and CARBOHYDRATES.Nanotechnology: The development and use of techniques to study physical phenomena and construct structures in the nanoscale size range or smaller.Encyclopedias as Topic: Works containing information articles on subjects in every field of knowledge, usually arranged in alphabetical order, or a similar work limited to a special field or subject. (From The ALA Glossary of Library and Information Science, 1983)HydrocarbonsPolycyclic Hydrocarbons, Aromatic: A major group of unsaturated cyclic hydrocarbons containing two or more rings. The vast number of compounds of this important group, derived chiefly from petroleum and coal tar, are rather highly reactive and chemically versatile. The name is due to the strong and not unpleasant odor characteristic of most substances of this nature. (From Hawley's Condensed Chemical Dictionary, 12th ed, p96)Receptors, Aryl Hydrocarbon: Cytoplasmic proteins that bind certain aryl hydrocarbons, translocate to the nucleus, and activate transcription of particular DNA segments. AH receptors are identified by their high-affinity binding to several carcinogenic or teratogenic environmental chemicals including polycyclic aromatic hydrocarbons found in cigarette smoke and smog, heterocyclic amines found in cooked foods, and halogenated hydrocarbons including dioxins and polychlorinated biphenyls. No endogenous ligand has been identified, but an unknown natural messenger with a role in cell differentiation and development is suspected.Carbon: A nonmetallic element with atomic symbol C, atomic number 6, and atomic weight [12.0096; 12.0116]. It may occur as several different allotropes including DIAMOND; CHARCOAL; and GRAPHITE; and as SOOT from incompletely burned fuel.Encyclopedias
... will react with acetone and acetaldehyde to produce acetylene by two different pathways. Triplet C2 molecules ... Skell, Philip S.; Plonka, James H. (1970). "Chemistry of the singlet and triplet C2 molecules. Mechanism of acetylene formation ... Acetylene is a major product; however, it appears C2 will insert into carbon-hydrogen bonds. C2 is 2.5 times more likely to ... This gives a bond order of 2, meaning that there should exist a double bond between the two carbons in a C2 molecule. A 2012 ...
They heated acetylene and selenium together at about 300°. The selenium burst into flame, and up to 15% selenophene was formed ... The selenophene molecule is flat and aromatic. Being aromatic it undergoes electrophilic substitution reactions at the -2 or -2 ...
... is an acetylene molecule protected on one end by the trimethylsilyl group. It is popularly used in ... It may also be prepared in a manner similar to other silyl compounds: deprotonation of acetylene with a Grignard reagent, ... Using a protected alkyne, as opposed to acetylene gas, prevents further (undesired) coupling reactions and also has the benefit ...
Semi-empirical models reduce the size of chemical mechanisms and use simpler molecules, such as acetylene as precursors. ... Soot forms during incomplete combustion from precursor molecules such as acetylene. It consists of agglomerated nanoparticles ... Nucleation of heavy molecules occurs to form particles. Surface growth of a particle proceeds by adsorption of gas phase ... The formation of soot is a complex process, an evolution of matter in which a number of molecules undergo many chemical and ...
The compound can be made by reaction of acetylene and methanol in presence of a base. The alkene portion of the molecule is ... 1-dimethoxyethane by the catalysed reaction of acetylene with methanol David Trimma, Corresponding Author Contact Information, ...
He is also particularly known for studies of the molecules acetylene (C2H2) and calcium monofluoride (CaF). His active research ... He is a physical chemist, specializing in spectroscopy of small molecules in the gas phase. He performed the first microwave- ... Hélène Lefebvre-Brion; Robert W. Field (1986). Perturbations in the spectra of diatomic molecules. Academic Press. ISBN 978-0- ... theoretical and computational physical chemistry of small molecules in the gas phase. He is the recipient of the Broida Prize, ...
In 1900, it was discovered that nitroform can be produced by the reaction of acetylene with anhydrous nitric acid. This method ... Trinitromethane as a neutral molecule is colorless. It is highly acidic, easily forming an intensely yellow anion, (NO2)3C−. ...
The relative instability of the carbon-oxygen bonds in the molecule is revealed by the comparison in the table of the energy ... Bredig, G.; Usoff, A. (1896). "Ist Acetylen ein Elektrolyt?" [Is acetylene an electrolyte?]. Zeitschrift für Elektrochemie. 3: ... A Hot Molecule Reaction". The Journal of Chemical Physics. 40: 105. Bibcode:1964JChPh..40..105B. doi:10.1063/1.1729851. Zimakov ... 1988). "Voltage molecules". Chemical Encyclopedia. 3. "Soviet encyclopedia". pp. 330-334. Traven VF (2004). VFTraven, ed. ...
The trimerization of a part of a nitrile molecule and two parts of acetylene into pyridine is called Bönnemann cyclization. ... consisting of two pyridine molecules joined by a single bond, and terpyridine, a molecule of three pyridine rings linked ... The molecule is planar and, thus, follows the Hückel criteria for aromatic systems. In contrast to benzene, the electron ... All the ring atoms in the pyridine molecule are sp2-hybridized. The nitrogen is involved in the π-bonding aromatic system using ...
Ethane, acetylene and diacetylene condense in the colder lower part of stratosphere forming haze layers with an optical depth ... The helium molar fraction, i.e. the number of helium atoms per molecule of hydrogen/helium, was determined from the analysis of ... Below the methane cloud deck at 1.3 bar methane molecules account for about 2.3% of the atmosphere by molar fraction; about 10 ... The upper part of the thermosphere, where the mean free path of the molecules exceeds the scale height, is called the exosphere ...
"Microwave spectroscopic study of the BBr molecule". Journal of Molecular Structure. 413-414: 471-476. doi:10.1016/s0022-2860(97 ... "Pulsed laser evaporated boron atom reactions with acetylene. Infrared spectra and quantum chemical structure and frequency ... orthogonal pπ-type orbitals and are degenerate in energy except in the case where R breaks the symmetry of the molecule, thus ... calculations for several novel organoborane BC2H2 and HBC2 molecules". The Journal of Physical Chemistry. 97 (22): 5839-5847. ...
This is followed by the formation of ethylene, ethane, acetylene, hydrogen cyanide, and other small simple molecules and small ... Tholins formed at low pressure tend to contain nitrogen atoms in the interior of their molecules, while tholins formed at high ... Further reactions form benzene and other organic molecules, and their polymerization leads to the formation of an aerosol of ... strikes molecules of the gas methane (CH 4) in Pluto's atmosphere, powering chemical reactions that create complex compounds ...
BF reacts with acetylenes to make the 1,4-diboracyclohexadiene ring system. BF can condense with 2-butyne forming 1,4-difluoro- ... Propene reacts to make a mix of cyclic and non-cyclic molecules which may contain BF or BF2. BF hardly reacts with C2F4 or SiF4 ... One reported computed bond order for the molecule is 1.4. BF is unusual in that the dipole moment is inverted with fluorine ... BF is isoelectronic with carbon monoxide and dinitrogen and each molecule has 14 electrons. The experimental B-F bond length is ...
One such chalcogen boride consists of two molecules of dimethyl sulfide attached to a boron-hydrogen molecule. Other important ... can create organic solvent-holding acetylene nanotubes. Chalcogen interactions are useful for conformational analysis and ... Oxygen's most common allotrope is diatomic oxygen, or O2, a reactive paramagnetic molecule that is ubiquitous to aerobic ... Diselenium diiodide, however, does occur in equilibrium with selenium atoms and iodine molecules. Some tellurium halides with ...
An important driving force for this type of reaction is the expulsion of small gaseous molecules such as acetylene or 2-butyne ... The olfactory molecule civetone can be synthesised from a di-alkyne. After ring closure the new triple bond is ...
The most important linear molecule with more than three atoms is acetylene (H−C≡C−H), in which each of its carbon atoms is ... Linear organic molecules, such as acetylene (HC≡CH), are often described by invoking sp orbital hybridization for their carbon ... Neutral AX2 molecules with linear geometry include beryllium fluoride (F−Be−F) with two single bonds, carbon dioxide (O=C=O) ... Chem, Chemistry, Structures, and 3D Molecules[permanent dead link] Indiana University Molecular Structure Center Interactive ...
doi: 10.1039/b505052a Ittel, S. D. "Olefin, Acetylene, Phosphine, Isocyanide, and Diazene Complexes of Nickel(0)" Inorganic ... "Stereochemically nonrigid six-coordinate molecules. II. Preparations and reactions of tetrakis(organophosphorus)metal dihydride ...
Acetylene molecule: Each carbon atom has four electrons in its outermost shell and each hydrogen atom has only one electron in ... Carbon dioxide molecule: Each carbon atom has four electrons in its outermost shell and each oxygen atom has six electrons in ... In common use, the four valences of carbon are shown by four bonds around a carbon atom as shown alongside Methane molecule: ...
... or in a glow discharge of a mixture of acetylene and helium. In the envelopes of carbon-rich evolved stars, acetylene is ... List of molecules in interstellar space Cochran, E. L., Adrian, F. J., and Bowers, V. A., ESR Study of Ethynyl and Vinyl Free ... Since acetylene provides a dominant formation pathway to ethynyl, observations of the product can yield estimates of the ... Acetylene (C2H2) does not have a dipole moment, and therefore pure rotational transitions (typically occurring in the microwave ...
... they are polyynes with a cyano group covalently bonded to one of the terminal acetylene units. A rarely seen group of molecules ... The light interacts with the molecule and can either absorb the light or reflect it, as not all light behaves the same way. ... The spectra is able to show the energy of the rotational state due to the wavelengths that are absorbed by the molecule, using ... Cyanoacetylene is one of the molecules that was produced in the Miller-Urey experiment and is expected to be found in carbon- ...
An example of the coupling of an aryl iodide to an aryl acetylene can be seen in the reaction of the iodinated alcohol and the ... which has allowed for the use of the Sonogashira cross-coupling reaction in the synthesis of complex molecules. Its ... Some examples include: The coupling of 2-iodo-prop-2-enol with a wide range of acetylenes such as TMSA to give enynyl alcohol, ... It is derived from vinylic systems and terminal acetylenes by using a configuration-retention stereospecific procedure such as ...
Van der Waals molecules with metals include LiNe. More Van der Waals molecules include CF4Ne and CCl4Ne, Ne2Cl2, Ne3Cl2, I2Ne, ... NeCCH+, a substituted acetylene, is predicted to be energetically stable by 5.9 kcal/mol, one of the most stable organic ions. ... P. J. Kuntz AND A. C. Roach (1972). "Ion-Molecule Reactions of the Rare Gases with Hydrogen Part 1.-Diatomics-in-Molecules ... I2Ne2, I2Ne3, I2Ne4, I2NexHey (x=1-5, y=1-4). Van der Waals molecules formed with organic molecules in gas include aniline, ...
The simplest form of an organic molecule is the hydrocarbon-a large family of organic molecules that are composed of hydrogen ... These anions are also associated with methane and acetylene, both very weak acids. With an electronegativity of 2.5, carbon ... The molecules each contain a triple bond and are fairly polar, resulting in a tendency to bind permanently to hemoglobin ... Chain length, side chains and functional groups all affect the properties of organic molecules. Carbon occurs in all known ...
... cycloaddition reaction of two acetylene molecules with an organotin molecule SnR2. Organotin chemistry Dubac, Jacques; ...
In chemistry, a trimer is a molecule or an anion formed by combination or association of three molecules or ions of the same ... In 1866, Marcellin Berthelot reported the first example of cyclotrimerization, the conversion of acetylene to benzene. This ... Three molecules of acetaldehyde condense to form paraldehyde, a cyclic trimer containing C-O single bonds. Catalyzing and ...
Molecules in stars. *Nexus for Exoplanet System Science. *கரிமச் சேர்மம். *புறவெளி. *PAH world hypothesis ... Cyanotetra-acetylene. *எத்திலீன் கிளைக்கால். *ஈத்தைல் பார்மேட்டு. *Methyl acetate. *Methyl-cyano-diacetylene. * ...
Home » Ionizing and nonionizing decays of superexcited acetylene molecules in the extreme-ultraviolet region ... Ionizing and nonionizing decays of superexcited acetylene molecules in the extreme-ultraviolet region. ... Rydberg states of the ArCO2 and KrCO2 van der Waals molecules. Dehmer, P. M. // Journal of Chemical Physics;7/1/1985, Vol. 83 ... The ionizing and nonionizing decay processes of the superexcited C2H2 molecules have been discussed in view of the strong ...
EVIDENCE OF A TRIPLET BARRIER ISOMERIZATION IN THE ACETYLENE MOLECULE ($C_{2}H_{2}$)?. ... acetylene linear barrier. Near the top of the barrier (about 45500cm-1) the probability density of vibrational wave function ...
... limits of 0.00001 and 0.01 torr have been investigated as a function of the energy transferred to the acetylene molecule during ... Rate constants are calculated for the various ion-molecule reactions. (Author)(*ALKYNES ... The consecutive ion-molecule reactions in acetylene within the pressure ... Abstract : The consecutive ion-molecule reactions in acetylene within the pressure limits of 0.00001 and 0.01 torr have been ...
4 - The diatomic molecule OH exists in the gas phase....Ch. 4 - Acetylene (C2H2) can be produced from the reaction...Ch. 4 - ... 4 - Two molecules used in the polymer industry are...Ch. 4 - Hot and spicy foods contain molecules that...Ch. 4 - One of the ... 4 - Consider three molecules: A, B, and C. Molecule A...Ch. 4 - The formulas of several chemical substances are...Ch. 4 - ... 4 - Which of the molecules in Exercises 21 and 22 have...Ch. 4 - Which of the molecules in Exercises 27 and 28 have...Ch. 4 - ...
Since acetylene is a linear symmetrical molecule, it possesses the D∞h point group. At atmospheric pressure, acetylene cannot ... 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 ...
Previous models had predicted that hydrogen molecules, a byproduct of ultraviolet sunlight breaking apart acetylene and methane ... the acetylene in icy aerosols in the atmosphere into more complex molecules that would fall to the ground with no acetylene ... This lack of acetylene is important because that chemical would likely be the best energy source for a methane-based life on ... is also so cold that a chemical process that involved a catalyst would be needed to convert hydrogen molecules and acetylene ...
They heated acetylene and selenium together at about 300°. The selenium burst into flame, and up to 15% selenophene was formed ... The selenophene molecule is flat and aromatic. Being aromatic it undergoes electrophilic substitution reactions at the -2 or -2 ...
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ACCURACY; ACETYLENE; CARBON 13; DEUTERIUM COMPOUNDS; HAMILTONIANS; ... The usual Hamiltonian appropriate to a linear molecule, including vibration and rotation l-type and the Darling-Dennison ... Infrared and Raman spectra of mono {sup 13}C fully deuterated acetylene, {sup 13}C{sup 12}CD{sub 2}, have been recorded and ... INFRARED SPECTRA; MOLECULES; POTENTIAL ENERGY; RAMAN SPECTRA; RAMAN SPECTROSCOPY; RESOLUTION; RESONANCE; ROTATION; SURFACES. ...
This interprets the bonding conditions for RTl≡PR molecules that feature small ligands. The other is model [II], which is best ... This explains the bonding character of RTl≡PR molecules that feature large substituents. Irrespective of the types of ... Keywords: triply bonded molecules; triple bond; acetylene; substituent effects triply bonded molecules; triple bond; acetylene ... Molecules 2017, 22, 1111. AMA Style. Lu J-S, Yang M-C, Su M-D. Substituent Effects on the Stability of Thallium and Phosphorus ...
Highly controlled acetylene accommodation in a metal-organic microporous material journal, July 2005 * Matsuda, Ryotaro; ... A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory Small-molecule binding in metal-organic frameworks (MOFs ... A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory Small-molecule binding in metal-organic frameworks (MOFs ... A route to high surface area, porosity and inclusion of large molecules in crystals journal, February 2004 * Chae, Hee K.; ...
Solid acetylene reagent for laboratory applications. Acetylene is one of the primary starting materials for chemical synthesis ... However, acetylene is a highly flammable gas, dangerous and difficult to use in regular research laboratories. A novel solid ... These are just three familiar examples of the hundreds of thousands of small molecules (also called specialized or secondary ... Fungi are rich sources of natural molecules for drug discovery, but numerous challenges have pushed pharmaceutical companies ...
Franklin, J.L.; Munson, M.S.B., Ion-molecule reactions in methane-oxygen and acetylene-oxygen systems, Symp. Combust., 10th, ... 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 ...
6 - Our understanding of organic molecules and...Ch. 6 - Any one molecule can be represented many ways. For...Ch. 6 - Explain ... 6 - Name this molecule. a. 3-propylhexane b....Ch. 6 - What property is characteristic of chlorinated...Ch. 6 - What property ... 6 - To what family does the molecule CH3COOCH3 belong?...Ch. 6 - Define organic chemistry.Ch. 6 - Why is carbon unique?Ch. 6 - ... Determine the maximum number of hydrogen bonds that can form between a dimethylamine molecule and a. other dime... ...
The acetylene molecule is important for atmospheric, planetary, and astrophysical applications. This organic molecule, known as ... ACETYLENE $^1$$^2$C$_2$H$_2$ LABORATORY MEASUREMENTS FOR ASTROPHYSICAL APPLICATIONS. ...
In studies using acetylene molecules (ethyne; C2H2, a molecule containing a triple bond between two carbon atoms) as feedstock ... Initiation of the mechanism begins with hydrogen atom abstraction from a precursor molecule followed by acetylene addition, and ... Institute of Transformative Bio-Molecules (ITbM), Nagoya University. Journal. Carbon. Keywords. *CHEMISTRY/PHYSICS/MATERIALS ... CNTs are molecules with a cylindrical nanostructure (nano = 10-9 m or 1 / 1,000,000,000 m). Arising from their unique physical ...
Previous models had predicted that hydrogen molecules, a byproduct of ultraviolet sunlight breaking apart acetylene and methane ... the acetylene in icy aerosols in the atmosphere into more complex molecules that would fall to the ground with no acetylene ... What is Consuming Hydrogen and Acetylene on Titan? This artist concept shows a mirror-smooth lake on the surface of the smoggy ... This lack of acetylene is important because that chemical would likely be the best energy source for a methane-based life on ...
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. ... The name vinyl refers to the remnant of an acetylene molecule after one hydrogen atom has been removed: -CH2=CH-.) About 20 ... Acetylene How Products Are Made COPYRIGHT 1996 Gale Research Inc.. Acetylene. Background. Acetylene is a colorless, combustible ...
Presently, this is only possible for small, linear molecules and for times less than 1 picosecond. Here, we demonstrate strong ... Here the authors use a shaped laser pulse to demonstrate field-free alignment of complex molecules in helium droplets. ... The opportunities field-free aligned molecules open are illustrated by measuring the alignment-dependent strong-field ... on a variety of large molecules and complexes. Strong molecular alignment without a laser field present is important for ...
In Japan, in 1967, a group of scientists were studying the polymerization of acetylene into plastics - acetylene was the gas ... In laboratories around the world, scientists are working hard to develop molecules for future electronics. And among test tubes ... where the very molecules perform the same tasks as the integrated circuits we just heard about in the Nobel Prize in Physics, ... is the process by which many small molecules react to form a long chain - a polymer. Professors Ziegler and Natta were awarded ...
The hydrocarbons differ both in the total number of carbon and hydrogen atoms in their molecules and in the proportion of ... Thus, the four smallest-molecule alkynes are ethyne (more usually called acetylene), propyne, butyne, and pentyne. Alkynes ... Because acetylene is explosive when compressed into liquid form, the tanks of acetylene that welders use contain acetylene ... Because acetylene is explosive when compressed into liquid form, the tanks of acetylene that welders use contain acetylene ...
Synthesis routes of novel piperidine-containing acetylenes are presented. The new molecules are expected to exhibit plant ... Piperidine, acetylene glycols, CPMD, MD, density functional theory, plant growth stimulation National Category Organic ... Experimental and density functional theory studies of some novel piperidine-containing acetylene glycols. Mirsakiyeva, Amina ... The structures of the obtained molecules were determined using nuclear magnetic resonance (NMR). The electronic structure and ...
Alkynes are traditionally known as acetylenes, although the name acetylene also refers specifically to C2H2, known formally as ... Molecules called ene-diynes feature a ring containing an alkene ("ene") between two alkyne groups ("diyne"). These compounds, e ... Lam, Jørgen (1988). Chemistry and biology of naturally-occurring acetylenes and related compounds (NOARC): proceedings of a ... Ethyne is commonly called by its trivial name acetylene.. In chemistry, the suffix -yne is used to denote the presence of a ...
Interactions between dehydrobenzo[12]annulene (DBA) and gas molecules: do the preorganized acetylenes. work cooperatively? ... Intermolecular interactions of the cyclic conjugated molecule (DBA) with hydrogen, nitrogen and carbon dioxide molecules were ... concern weak forces of attraction formed between different molecules (intermolecular) or fragments of the same molecule ( ... A set of molecules locked in the CH⋯O H-bonding conformation has been used to correlate the magnitude of the downfield shift of ...
This is the molecule known to most of you as acetylene. If were to make this correspond to last years picture, then this ... Whats good for the Perl molecule is good for the Open Source molecule. Last year I gave you a picture of the Open Source world ... Just as each of those atoms is necessary to the proper functioning of the molecule as a whole, the molecule as a whole is ... Maybe Im a heavy cobalt atom hidden off somewhere in the middle, but the whole molecule is what works. The molecule has what ...
Gold catalysed production of VCM from acetylene hydrochlorination (JM). *Production of fragrance molecules by oxidation (IFF) ... My principle interests lie in the use of these materials for both the selective and total oxidation of organic molecules for ... Selective oxidation of biomass molecules for production of value-added projects. *Synthesis and evaluation of novel MOF ...
  • The ionizing and nonionizing decay processes of the superexcited C2H2 molecules have been discussed in view of the strong competition of autoionization and neutral dissociation. (ebscohost.com)
  • C2H2, a molecule containing a triple bond between two carbon atoms) as feedstock, the ethynyl radical (C2H), a highly reactive molecular intermediate was found to play an important role in both processes forming CNTs and soot, which are two distinctively different structures. (eurekalert.org)
  • Acetylene (C 2 H 2 ) can be produced from the reaction of calcium carbide (CaC 2 ) with water. (bartleby.com)
  • Acetylene is easily prepared commercially by the reaction of calcium carbide with water, but is prepared commercially by the pyrolysis of hydrocarbons. (encyclopedia.com)
  • Our simulations have shown that acetylene oligomerization and cross-linking reactions between hydrocarbon chains occur as major reaction pathways in CNT growth, along with decomposition to atomic carbon" says Professor Stephan Irle, who led the research, "this follows hydrogen-abstraction acetylene addition (HACA)-like mechanisms that are commonly observed in combustion processes" he continues. (eurekalert.org)
  • We have performed an in situ x-ray absorption fine structure study of gold/carbon (Au/C) catalysts under acetylene hydrochlorination reaction conditions and show that highly active catalysts comprise single-site cationic Au entities whose activity correlates with the ratio of Au(I):Au(III) present. (sciencemag.org)
  • Photochemical reaction of the adsorbate molecules on the solid surface in a soft x-ray region is important for fundamental study of elementary chemical reactions as well as for application study of photochemical vapor deposition, etching catalysis and so on. (nii.ac.jp)
  • Fragmentation and reaction of polyatomic molecules induced by uv-photon electronic excitation, using both experimental and computational techniques. (nottingham.ac.uk)
  • However, the techniques most commonly employed to track nuclear rearrangement in a molecule were largely insensitive to the subtle and irregular changes that occur during a chemical reaction. (ecnmag.com)
  • A search was made for the HNO molecule in the reaction system NH$\sb2$ + NO at room temperature using diode laser infrared kinetic spectroscopy to search for NH stretch absorptions of HNO. (rice.edu)
  • CAMBRIDGE, MA -- During a chemical reaction, the molecules involved in the reaction gain energy until they reach a "point of no return" known as a transition state. (eurekalert.org)
  • Field and his colleagues used millimeter-wave spectroscopy, which can measure the rotational-vibrational energy of reaction product molecules, to determine the structure of the products of the breakdown of vinyl cyanide caused by ultraviolet light. (eurekalert.org)
  • For any chemical reaction to occur, the reacting molecules must receive an input of energy that enables the activated molecules to reach a transition state, from which the products are formed. (eurekalert.org)
  • In a paper published in 2015, Field and his colleagues used laser spectroscopy to characterize the transition state for a different type of reaction known as an isomerization, in which a molecule undergoes a change of shape. (eurekalert.org)
  • In their new study, the researchers explored another style of reaction, using ultraviolet laser radiation to break molecules of vinyl cyanide into acetylene and other products. (eurekalert.org)
  • Textbook knowledge postulates that classical reaction mechanisms involve complex reactions following hydrogen abstraction and acetylene addition (HACA) sequences with substantial 'activation energies. (innovations-report.com)
  • This highly selective reaction can be applied for the conjugation of peptides with various molecules and for the cyclization of peptides. (bachem.com)
  • The developed reaction conditions led to high yields of unprotected acetylenes with cyclic, nitro and linear keto esters as well as keto amides. (epfl.ch)
  • This allows a new direct access to chiral acetylene compound in high yields under operationally simple reaction conditions. (epfl.ch)
  • While researching this enzyme, biochemists at the Technische Universität München (TUM) discovered a previously unknown reaction: IspH accepts two completely different classes of molecules as partners. (tum.de)
  • On July 28, 2017, scientists made two separate announcements of new discoveries of organic molecules in the thick atmosphere of Saturn's large moon Titan. (earthsky.org)
  • These molecules were newly synthesized by our experimental collaborators and are expected to provideplant growth stimulation properties, the same as its diacetylene analogs. (diva-portal.org)
  • Application of second-order vibrational perturbation theory (VPT2) results in vibrational frequencies that agree well with the known fundamental and combination band experimental frequencies of acetylene, diacetylene, and triacetylene (average discrepancies are less than 10 cm −1 ). (rsc.org)
  • Extensive theoretical and experimental studies have been carried out for acetylene and diacetylene in the past few decades, including high-resolution spectroscopic studies of all the fundamental bands and a significant number of the combination bands, 29,40-50 and high level ab initio calculations that take into account anharmonic effects. (rsc.org)
  • However, in quantum physics , organic chemistry , and biochemistry , the term molecule is often used less strictly, also being applied to polyatomic ions . (wikipedia.org)
  • Polyatomic ions may sometimes be usefully thought of as electrically charged molecules. (wikipedia.org)
  • The term unstable molecule is used for very reactive species, i.e., short-lived assemblies ( resonances ) of electrons and nuclei , such as radicals , molecular ions , Rydberg molecules , transition states , van der Waals complexes , or systems of colliding atoms as in Bose-Einstein condensate . (wikipedia.org)
  • This definition often breaks down since many substances in ordinary experience, such as rocks , salts , and metals , are composed of large crystalline networks of chemically bonded atoms or ions , but are not made of discrete molecules. (wikipedia.org)
  • Caselli stated that studying the abundance of various elements, ions, and molecules in space helps us to understand Earth's geochemistry. (nap.edu)
  • Nagoya, Japan - Professor Stephan Irle of the Institute of Transformative Bio-Molecules (WPI-ITbM) at Nagoya University and co-workers at Kyoto University, Oak Ridge National Lab (ORNL), and Chinese research institutions have revealed through theoretical simulations that the molecular mechanism of carbon nanotube (CNT) growth and hydrocarbon combustion actually share many similarities. (eurekalert.org)
  • Theoretical simulations coordinated by Professor Irle have looked into the molecular mechanisms of CNT growth using acetylene molecules as feedstock (Figure 1). (eurekalert.org)
  • High level theoretical calculations using quantum chemical molecular dynamics were performed to study the early stages of CNT growth from acetylene molecules on small iron (Fe38) clusters. (eurekalert.org)
  • Molecules with their axes sharply confined in space, available through laser-induced alignment methods, are essential for many current experiments, including ultrafast molecular imaging. (nature.com)
  • Our technique will enable molecular frame experiments, including ultrafast excited state dynamics, on a variety of large molecules and complexes. (nature.com)
  • Firstly, they make it possible to explore or exploit the orientational dependence of molecular interactions, and secondly, they maximize the information content of experimental observables because the usual blurring effect from randomly oriented molecules is minimized. (nature.com)
  • Molecules" and "Molecular" redirect here. (wikipedia.org)
  • For other uses, see Molecules (journal) and Molecular (game) . (wikipedia.org)
  • The science of molecules is called molecular chemistry or molecular physics , depending on whether the focus is on chemistry or physics. (wikipedia.org)
  • Molecular chemistry deals with the laws governing the interaction between molecules that results in the formation and breakage of chemical bonds , while molecular physics deals with the laws governing their structure and properties. (wikipedia.org)
  • In molecular sciences, a molecule consists of a stable system ( bound state ) composed of two or more atoms . (wikipedia.org)
  • Molecular photoionization dynamics of oriented gas-phase and adsorbed molecules and of chiral molecules. (nottingham.ac.uk)
  • Photodissociation studies of molecular ion and neutral molecules. (nottingham.ac.uk)
  • The team used a femtosecond laser source to shoot a molecular movie of how an acetylene molecule turns into vinylidene. (ecnmag.com)
  • This form of imaging uses a compact laser source and is a simple option for studying the ultrafast molecular dynamics of other small organic molecules," said Banting postdoctoral fellow and primary author of the article Heide Ibrahim. (ecnmag.com)
  • Researchers at the Max Born Institute (MBI) have shown that high-resolution movies of molecular dynamics can be recorded using electrons ejected from the molecule by an intense laser field. (brightsurf.com)
  • Towards high-resolution spectroscopy and dynamics studies in complex multi-ionized molecules. (ebscohost.com)
  • New experimental developments for high-resolution spectroscopy and dynamics studies of complex multi-ionized molecules are presented. (ebscohost.com)
  • In recent years, a lot of interest has been attracted surrounding the development of effective techniques and sensitive methods for acetylene gas detection, such as photoacoustic spectroscopy [ 7 ], optical fiber [ 6 , 8 ] and metal-oxide semiconductors (MOS) and nanomaterial-based sensors (i.e. (mdpi.com)
  • And today we'll talk about the tools that you use to identify- or the aspects of NMR spectroscopy that allow you to assign structures to molecules. (yale.edu)
  • Every hydrocarbon molecule is built upon a skeleton of carbon atoms bonded to each other either in the form of closed rings or in a continuous rowlike links in a chain. (encyclopedia.com)
  • Such sensitive hydrocarbon molecule detection could enhance capabilities in many applications. (photonics.com)
  • The scientists noted they are building blocks towards more complex molecules, and might have acted as the basis for the earliest forms of life on Earth. (earthsky.org)
  • Chemistry of the singlet and triplet C2 molecules. (wikipedia.org)
  • know how to apply the acquired knowledge on the chemical behavior of organic molecules to the solution of problems both in a strictly chemical environment and in the broader context of life sciences (with particular reference to those concerning Medicinal Chemistry, Biochemistry and Pharmacology). (unimi.it)
  • Detecting chirality in molecules by imaging photoelectron circular dichroism: Invited Perspective Physical Chemistry Chemical Physics. (nottingham.ac.uk)
  • Nature has evolved catalytic tools that would enable chemists to build molecules that we can't easily build just using traditional chemistry," says senior study author Alison Narayan, assistant professor at the University of Michigan Life Sciences Institute. (electrochem.org)
  • Acetylenes are versatile intermediates in chemistry, biochemistry and material sciences. (epfl.ch)
  • This organic molecule, known as a precursor of amino acids, shows numerous vibration-rotation bands in the IR. (osu.edu)
  • Spectroscopic and dynamical studies of highly energized small polyatomic molecules. (unt.edu)
  • This is a progress report on a project to spectroscopically study small polyatomic molecules which are highly excited. (unt.edu)
  • However, acetylene is unstable and there is a huge potential risk of fire or explosive accidents during its compression and heat treatment, or due to leakage. (mdpi.com)
  • These unstable molecules were produced in a flowing system by excimer laser photolysis of suitable precursors. (rice.edu)
  • 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. (osti.gov)
  • and a polymer coating completely covering the SERS active nanotag, wherein the SERS-active nanotag comprises: a core comprising one or more nanoparticles, a Raman-active molecule attached to or associated with the core, and an encapsulant. (google.ca)
  • Beyond the dipole approximation: Angular distribution effects in the 1s photoemission from small molecules. (ebscohost.com)
  • Recent experiments on the 1s inner shells of small molecules at relatively low photon energies ( (ebscohost.com)
  • P. This interprets the bonding conditions for RTl≡PR molecules that feature small ligands. (mdpi.com)
  • Presently, this is only possible for small, linear molecules and for times less than 1 picosecond. (nature.com)
  • Among them, metal oxides have become important candidates for acetylene sensing due to their unique advantages-such as their small size and simplicity of integration-but they lack selectivity towards different gas species, and often require high operating temperatures and have high power consumption [ 16 , 17 , 18 , 19 , 20 ]. (mdpi.com)
  • According to Merriam-Webster and the Online Etymology Dictionary , the word "molecule" derives from the Latin " moles " or small unit of mass. (wikipedia.org)
  • Previous work in the Omary group entailed systematically designed small molecules, metallopolymers, and unconjugated metallodendrimers that contain d10 and d8 metals, whereas this dissertation aims in part to expand such strategies to the conjugated metallodendrimer regime. (unt.edu)
  • This 'chemical genetic' approach uses biologically active natural products and de novo designed small molecules to identify critical components in intracellular processes. (yalecancercenter.org)
  • More recently, we have explored the use of small molecules to control intracellular protein levels, either by inhibiting their degradation or by inducing their proteolysis via the 26S proteasome. (yalecancercenter.org)
  • Small-Molecule PROTACS: New Approaches to Protein Degradation. (yalecancercenter.org)
  • Catalytic in vivo protein knockdown by small-molecule PROTACs. (yalecancercenter.org)
  • Small-Molecule-Mediated Degradation of the Androgen Receptor Through Hydrophobic Tagging. (yalecancercenter.org)
  • New vibrational frequencies and rotational parameters from the presented theoretical predictions are given for triacetylene and tetraacetylene, which can be used to aid laboratory and astronomical spectroscopic searches for characteristic transitions of these molecules. (rsc.org)
  • This thesis describes recent spectroscopic studies of acetylene and its HCCD isotopomer. (mit.edu)
  • The exponential increase of the quantity $P_{vit}$ (V) could be due to a triplet ($^{3}B_{u}$ trans-bent $\longrightarrow ^{3}B_{2}$ as-bent) acetylene linear barrier. (osu.edu)
  • Earlier definitions were less precise, defining molecules as the smallest particles of pure chemical substances that still retain their composition and chemical properties. (wikipedia.org)
  • Caselli described dark clouds in which the temperature is so low (6 K) that molecules freeze out onto dust particles and form thick icy mantles, which are composed primarily of water, carbon monoxide, and other molecules and represent the precursors of planets. (nap.edu)
  • The polymerized imaging enhancement liposome particles interact with receptor targets holding the image enhancement agent to specific sites providing in vivo study by magnetic resonance, radioactive, x-ray or optical imaging of the expression of molecules in cells and tissues during disease and pathology. (google.com)
  • The oxidation is performed mainly by the OH particles, but O 2 molecules are important in this process and have to be considered. (scielo.br)
  • Potential applications for mid-infrared laser-based detection of organic molecules include analysis of human breath for medical diagnostics, detection of impurities in industrial process gases (e.g., in semiconductor wafer manufacture), airborne natural gas pipeline leak detection and monitoring industrial greenhouse gas emissions. (photonics.com)
  • Of critical importance for life detection are positive and negative controls, a better understanding of false positives and false negatives, and how to detect different types of species and molecules related to life (and what they would even be). (nap.edu)
  • 3. The functional polymer with a supported pressure-sensitive luminophore according to claim 1, wherein the acetylene derivative is 5-(4-trimethylsilyl ethynyl phenyl)-10,15,20-triphenyl platinum porphyrin. (freepatentsonline.com)
  • and the acetylene derivative is 5-(4-trimethylsilyl ethynyl phenyl)-10,15,20-triphenyl platinum porphyrin. (freepatentsonline.com)
  • 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)