This report presents the criteria and the recommended standard based thereon which were prepared to meet the need for preventing occupational disease or injury arising from exposure to 1,1,2,2- tetrachloroethane (79345). The recommendations for the standard include sections on environmental, medical, labeling and posting, personal protective equipment, hazard information, work practices, sanitation, and monitoring and recordkeeping requirements. The standard is based on the biologic effects of exposure, environmental data and engineering controls, previous standards, and work practices. Appendices are included on sampling methods, analytical methods, material safety data sheet, and the physical and chemical properties of 1,1,2,2-tetrachloroethane. - NIOSHTIC-2 ...

TY - JOUR. T1 - Olefin Selective Ag-Exchanged X-Type Zeolite Membrane for Propylene/Propane and Ethylene/Ethane Separation. AU - Sakai, Motomu. AU - Sasaki, Yasuhito. AU - Tomono, Taisuke. AU - Seshimo, Masahiro. AU - Matsukata, Masahiko. PY - 2019/1/30. Y1 - 2019/1/30. N2 - Propylene/propane and ethylene/ethane separation was examined with Ag-exchanged X-type zeolite membrane (Ag-X membrane). The Na-X membrane was prepared on a porous tubular α-alumina support by a secondary growth method. The resulting Na-X membrane was ion-exchanged by using AgNO3 aq. Olefin selectivities in both mixtures were markedly improved after the ion exchange from Na to Ag cation. The Ag-X membrane exhibited a maximum propylene selectivity of 55.4 with a permeance of 4.13 × 10-8 mol m-2 s-1 Pa-1 at 353 K for a propylene/propane (50:50) mixture. This membrane also exhibited a maximum ethylene selectivity of 15.9 with a permeance of 9.04 × 10-8 mol m-2 s-1 Pa-1 at 303 K for an ethylene/ethane (50:50) mixture. We ...

Fresh human milk has a higher antioxidant capacity than infant formula. This result is consistent with the study of Shoji et al,10 who found increased urinary 8-hydroxy-2′-deoxyguanosine excretion in formula fed infants compared with breast fed infants. Schwarz et al11 found similar results by measuring breath ethane concentrations in breast fed and formula fed infants. Although most studies showed that human milk had a higher antioxidant capacity than formula, one study by Alberti-Fidanza et al12 using the oxygen radical absorbance capacity assay, suggested that formula may have higher antioxidant capacity than human milk. The difference in these findings may be due to the different methods used to determine the antioxidant capacity of human milk. An improved oxygen radical absorbance capacity assay has been developed and validated using fluorescein.13,14 Friel et al15 showed that human milk has better antioxidant protection than formulas, perhaps because of the higher iron content of ...

Fingerprint Dive into the research topics of Identification of bottleneck enzymes with negative dynamic sensitivities: Ethanol fermentation systems as case studies. Together they form a unique fingerprint. ...

While nitroethane may be the physiological substrate, the enzyme also acts on several other nitroalkanes, including 1-nitropropane, 2-nitropropane, 1-nitrobutane, 1-nitropentane, 1-nitrohexane, nitrocyclohexane and some nitroalkanols ...

gas turbine as a function of fuel composition. A statistically designed experiment was carried out and exhaust emissions were obtained for significant amounts of ethane and propane. In addition, a limited study of the effect of inerts was conducted. The results show that emissions of NOx , CO, and NOx ∕NO are not well correlated with common descriptions of the fuel, such as higher heating value or methane number. The results and trends indicate that the presence of higher hydrocarbons in the fuel leads to appreciably higher NOx emissions for both test devices operating under similar lean conditions, while having less impact on CO emissions.. ...

The feedstock composition of YANSABs production is a combination of ethane (30%) and propane (70%). We estimate the cost of ethane at $0.75 per million British thermal units, which is sourced from Saudi Aramco. Meanwhile, the cost of propane will come at a significant reduction. The companys ethylene production capacity is the second highest in the GCC region after Jubail United Petrochemical Company (JUPC).. Unlike some of the other Saudi bases where new petrochemical capacity has recently been introduced, YANSAB has not experienced any operational issues so far and it now appears that the company is operating at full capacity.. Propane in Saudi Arabia is priced at a 30% discount to Japanese naphtha and ethane at $0.75 per mmbtu, as per the World Trade Organisation agreement. Although the ethylene cost advantage with this blend of feedstock is not as material as in the case of 100% ethane crackers in Saudi Arabia, it is still very attractive relative to the marginal producer.. However, with ...

A continuous-wave (CW) interband cascade laser (ICL) based mid-infrared sensor system was demonstrated for simultaneous detection of atmospheric methane (CH4) and ethane (C2H6). A 3.337 µm CW ICL with an emitting wavenumber range of 2996.0−3001.5 cm−1 was used to simultaneously target two absorption lines, C2H6 at 2996.88 cm−1 and CH4 at 2999.06 cm−1, respectively. The sensor performance was first evaluated for single-gas detection by only targeting the absorption line of one gas species. Allan deviations of 11.2 parts per billion in volume (ppbv) for CH4 and 1.86 ppbv for C2H6 with an averaging time of 3.4 s were achieved for the detection of these two gases. Dual-gas detection was realized by using a long-term scan signal to target both CH4 and C2H6 lines. The Allan deviations increased slightly to 17.4 ppbv for CH4 and 2.4 ppbv for C2H6 with an averaging time of 4.6 s due to laser temperature and power drift caused by long-term wavelength scanning. Measurements for both indoor and ...

2) Worked on Petro Rabigh In-Plant Project in Yanbu with SAUDI ARAMCO as client, which includes Construction of Ethane & Butane Lines for Petro Rabigh Oil Refinery in Rabigh.(LSTK 144 Million Riyals). RESPONSIBILITIES. ...

CAS 9016-87-9 75-68-3 75-45-6 101-68-8 HANDI-FOAM ONE-COMPONENT FOAM SEALANT higher oligomers of mdi, polymethylene polyphenyleneethane, 1-chloro-1,1-difluoro-, chlorodifluoroethane (dot),chlorodifluoromethane, freon 22, monochlorodifluoromethanefluorocarbon (non-flammable compressed gas,diphenylmethanediisocyanate (mdi), methylene bis msds toxicity property

The CFBS (Collinear Fast-Beam Laser Spectroscopy) experiment at TRIUMF is designed to exploit the high beam-intensity and radioisotope-production capability of TRIUMFs Isotope Separator and Accelerator (ISAC), as well as modern ion-trap beam-cooling and bunching techniques, in order to measure the hyperfine energy levels and isotope shifts of short-lived isotopes using laser spectroscopy. These measurements can be used to obtain nuclear structure information on exotic isotopes such as: nuclear magnetic moments (magnetic dipole and electric quadrupole), nuclear spin and changes in mean-square charge radii ...

Close The Infona portal uses cookies, i.e. strings of text saved by a browser on the users device. The portal can access those files and use them to remember the users data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser. ...

Close The Infona portal uses cookies, i.e. strings of text saved by a browser on the users device. The portal can access those files and use them to remember the users data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser. ...

The Wand lab is also committed to continuing improvement and development of novel NMR techniques. They have recently focused on high pressure NMR to probe the protein ensemble, NMR relaxation methods to measure conformational dynamics throughout the protein and a novel method to approach large soluble, unstable and membrane proteins by solution NMR methods. The latter approach involves the use of reverse micelle encapsulation to provide a protective environment for proteins to allow them to be dissolved in low viscosity fluids such as liquid ethane. The initial idea was to use the low viscosity of ethane to overcome the slow tumbling problem for solution NMR spectroscopy presented by large protein in water. Applications have since been expanded to studies of proteins of marginal stability by employing the confined space of the reverse micelle, suppression of protein aggregation to allow study of intermediates of aggregation such as occur in amyloid formation, and studies of membrane proteins. ...

Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice ...

I keep seeing posts generally like those above, yet in my experience one can get pretty much whatever they want on ebay. I poked around there before I joined here and never had a problem finding whatever I was looking for. All of it exactly as described, list I, list II, list whatever...what i have found is that items are easier to find if one knows the varied forms and names ...

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If you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library, or send a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. ...

Dec. 18, 1962 w. H. MARSHALL, JR 3,063,659 HEATING cow FLUIDS WITH PRODUCTION OF ENERGY Filed Aug. 25, 1960 2 Sheets-Sheet 1 FIG. 1 IN V EN TOR. ZDalzon H marshaILJ HEATING cow FLUIDS WITH PRODUCTION OF ENERGY Filed Aug. 25, 1960 Dec. 18, 1962 w. H. MARSHALL, JR 2 Sheets-Sheet 2 P. m 5 T. mm v w LMSQ v m hmfihx 11 w WM 1. mm s A n .w a R W mw )& w w W/ wmm fi an S & M Q & a R Q m V.) x WV N States This invention relates to a method of heating cold fluids, particularly liquefied low boiling gases such as nitrogen, methane, and ethane, with the simultaneous production of energy. There is a growing use of low temperatures in the storage and transportation of gases and generally, when low temperature storage or transport is employed, the gas has to be heated to ambient temperatures or above before it can be put toits final use; thus natural gas (methane), ethane and propane may now be stored and transported as boiling liquids which are regasified and heated at the point of use. In this regasifying ...

Skies like a bad day in LA, red-and-black rainbows, Mississippi-style river channels - Saturns largest moon is our prototype weird-world exoplanet

Chlorinated aliphatic hydrocarbons (CAHs) such as vinyl chloride (VC) and 1,-2 dichioroethane (DCA), are wide-spread groundwater pollutants found at many contaminated field sites around the world. Quantitative tools are needed to determine the in situ rates of VC and DCA transformation to ethene in contaminated groundwater. The objective of this study was to evaluate the potential of E-/Z-chlorofluoroethene (E-/Z-CFE) and DCA-d₄ as surrogates for VC and DCA, respectively. Laboratory microcosm and batch reactors experiments were performed to determine the kinetics and products of VC and E-/Z-CFE transformation to ethene and fluoroethene (FE), respectively. In addition, the products and pathway of DCA and DCA-d₄ also were determined. In all microcosms and batch reactors, E-CFE was preferentially transformed over Z-CFE. For the three experimental systems, the rate of E-CFE transformation to FE was within a factor of 2.7 of that for VC to ethene, which indicates that E-CFE is suitable for use as ...

In two recent papers from these laboratories it was shown that when methane- and ethane-oxygen mixtures containing excess of the hydrocarbon react at high pressure various liquid products can be isolated. For methane-oxygen mixtures methyl alcohol and water are found, and for ethane-oxygen mixtures ethyl alcohol, acetaldehyde, methyl alcohol, acetic acid, formic acid, and water. These products being important for the light they throw on the mechanism of hydrocarbon combustion and because they suggest means for using waste hydrocarbon gases, further experiments have now been made with the object of finding the order of their formation and the optimum condition for their survival. ...

The introduction of the combination of open metal site (OMS) and π-complexation into MOF has led to very high ethylene-ethane adsorption selectivity at 318 K, as illustrated in the context of MIL-101-Cr-SO3Ag. The interactions with ethylene from both OMS and π-complexation in MIL-101-Cr-SO3Ag have been inves

/eth ayn/, n. Chem. a colorless, odorless, flammable gas, C2H6, of the methane series, present in natural gas, illuminating gas, and crude petroleum: used chiefly in organic synthesis and as a fuel gas. Also called dimethyl. [1870 75; ETH(YL) +…

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Competition from US imports remains strong with high inventories in the US Gulf, and a strong drive by US suppliers to increase sales volume. Railroad congestion has eased in the country and weather concerns have dissipated. Deliveries are now normal and there are no logistics problems in the country. Pemex production has grown to about 35,000 tonnes/month for PE with the new ethane provision from Vitol. Ethane is first destined to ethylene oxide (EO) and ethylene glycols (EG) in Mexico, and the rest to PE plants. The Morelos swing plant, currently used only for linear low density PE (LLDPE) production, stopped on 28 November for scheduled maintenance and will be down for 30 days, according to Pemex sources. In the Cangrejera complex, (LDPE), production is up, with two out of three trains operating normally. This is the new reality for this plant. High density PE (HDPE) production is normal at the Asahi and Mitsui plants, with all four trains in operation. In Brazil, Braskem has been busy ...

Adsorption Database | Temperature 273K | Adsorbate CAS Number: 74-84-0 | Adsorbent Solid Class: activated carbon | SpringerMaterials 2013

Remove contaminated clothing and wash before reuse. Use only in a well ventilated area. Ground and bond containers when transferring material. Use spark-proof tools and explosion proof equipment. Do not breathe dust, vapor, mist, or gas. Do not get in eyes, on skin, or on clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Keep container tightly closed. Avoid contact with heat, sparks and flame. Do not ingest or inhale. Discard contaminated shoes. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames ...

Adsorption Database | Temperature 324.2K | Adsorbate CAS Number: 74-84-0 | Adsorbent Solid Class: activated carbon | SpringerMaterials 2013

Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice ...

Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice ...

article{1e3e8517-316c-47fb-8c15-58084740f5dd, abstract = {When 7-oxodesacetamidothiocolchicine ( 1) was treated with various peroxides in order to afford a Baeyer-Villiger rearrangement, a complex mixture of products was formed, which included the sulfoxide, ( 2) and sulfone, ( 3). When peracetic acid was used two additional products were formed; a C-ring lactone ( 4) and a ring-contracted allocolchicine derivative ( 5). The sulfoxide ( 2) was semi-preparatively resolved into enantiomers by chromatography on microcrystalline triacetylcellulose. Rotational barriers around the A - C pivot bond of 2, 4 and 5 were determined by dynamic H-1 NMR analysis. The compounds 2, 3, 4 and 7a exhibit moderate inhibition of tubulin polymerization, according to in vitro turbidity studies, whereas 5 was inactive.}, author = {Berg, Ulf and Bladh, Håkan and Mpampos, Konstantin}, issn = {1477-0539}, language = {eng}, number = {14}, pages = {2125--2130}, publisher = {Royal Society of Chemistry}, series = {Organic ...

TY - JOUR. T1 - Conformational dynamics of α,β,γ,δ-tetraarylporphyrins and their dications. AU - Dirks, Jennie Wang. AU - Underwood, George. AU - Matheson, Jolene Cox. AU - Gust, John Devens. PY - 1979. Y1 - 1979. N2 - Rotational isomerism in several tetraarylporphyrin free bases and the corresponding dications has been studied by using dynamic 1H NMR spectroscopy. The average free energy of activation for rotation of a single aryl ring for the stereoisomers of α,β,γ,δ-tetrakis(2-methoxyphenyl)porphyrin is ΔG≠433 = 25.9 kcal/mol. The barrier for the corresponding dication is ΔG≠388 = 23.0 kcal/mol. For α,β,γ,δ-tetrakis(2,4-dimethoxyphenyl)porphyrin and its dication, the rotational barriers are ΔG≠433 = 25.2 and ΔG≠388 = 21.8 kcal/mol, respectively. These results shed light on the questions of the degree of distortion of the porphyrin macrocycle in solution and the orientation of the aryl rings relative to the mean porphyrin plane.. AB - Rotational isomerism in several ...

Langhals, Heinz; Demmig, Stefan und Huber, Helmut (1988): Rotational barriers in perylene fluorescent dyes. In: Spectrochimica Acta Part A: Molecular Spectroscopy, Vol. 44, Nr. 11: S. 1189-1193 [PDF, 309kB] ...

Looking for Ethane-1,2-diol? Find out information about Ethane-1,2-diol. see glycol glycol , dihydric alcohol in which the two hydroxyl groups are bonded to different carbon atoms; the general formula for a glycol is n 2. Explanation of Ethane-1,2-diol

-1,2-Dichloroethene, analytical standard; 1,1,2,2-Tetrachloroethane; 1,2-Dichlorobenzene; Bromomethane; Chloromethane; Chloroform; Vinyl chloride

For cryo-EM, 2 μl of sample was placed on a glow-discharged lacey carbon film EM grid, blotted and plunge-frozen in liquid ethane. The samples were imaged on an FEI F30 electron microscope operating at 300 kV and with a magnification of ×59000. Micrographs without evidence of astigmatism, drift or excessive defocus were digitized using a Z/I Photoscan scanner giving a pixel size at the specimen of 1.1865 Å (1 Å=0.1 nm), interpolated for processing to 2.37 Å. The defocus was determined and the micrographs further triaged using ctffind3. The particles were picked using the EMAN program Boxer [34], after contrast enhancement in MATLAB via a self-written routine in which a three-level decomposition with a fourth-order bi-orthogonal wavelet function was applied to the images. The usefulness of this particular filter was determined empirically and on the basis of the positions so identified for the FLN molecules. Unfiltered particles were extracted, again in Boxer, and then corrected for their ...

(1S)-1-(2-Chlorophenyl)ethane-1,2-diol 133082-13-0 NMR spectrum, (1S)-1-(2-Chlorophenyl)ethane-1,2-diol H-NMR spectral analysis, (1S)-1-(2-Chlorophenyl)ethane-1,2-diol C-NMR spectral analysis ect.

The ratio of 13C to 12C in marine sedimentary rocks holds important clues to the evolution of the carbon cycle through Earth history. Isotopic analyses are traditionally carried out using isotope ratio mass spectrometry (IRMS), but this technique is labor-intensive, expensive and requires expert know-how. He

Béla Tuzson,1,* Markus Mangold,1 Herbert Looser,2 Albert Manninen,1,3 and Lukas Emmenegger1 1Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf 8600, Switzerland 2FHNW, University of Applied Sciences, Institute for Aerosol and Sensor Technology, Steinackerstrasse 5, Windisch 5210, Switzerland 3Centre for Metrology and Accreditation, 1 Tekniikantie, Espoo FI-02151, Finland *Corresponding author: [email protected] ...

Method and apparatus for analyzing a breath sample provide user-friendly operation and analysis. The method and apparatus provide for automatic operation and coordination of operation of and absorbent sample tube, including desorbing means, a chromatographic precolumn, a chromatographic main column, a detector, a data processor, a sample receiving tube for receiving exhaled breath sample, a sample loop for aspirating a prescribed quantity of breath sample from the sample receiving tube, a sample valve, a standard gas reservoir, and a standard gas valve. All of the foregoing are operated automatically in such that start cycles, detector cycles, fault detection cycles, standardizing, analysis, shutdown and end cycles are performed in a way which allows for straightforward and simple measurement of breath sample by a user.

We present a sensitive 3 sigma upper limit of 1.1% for the HNC/HCN abundance ratio in comet 73P/SchwassmannWachmann (fragment B), obtained on 2006 May 10-11, using Caltech Submillimeter Observatory (CSO). This limit is a factor of ~7 lower than the values measured previously in moderately active comets at 1 AU from the Sun. Comet 73P/Schwassmann-Wachmann was depleted in most volatile species, except of HCN. The low HNC/HCN ratio thus argues against HNC production from polymers produced from HCN. However, thermal degradation of macromolecules, or polymers, produced from ammonia and carbon compounds, such as acetylene, methane, or ethane appears a plausible explanation for the observed variations of the HNC/HCN ratio in moderately active comets, including the very low ratio in comet 73P/Schwassmann-Wachmann reported here. Similar polymers have been invoked previously to explain anomalous N-14/N-15 ratios measured in cometary CN. ...

1 Answer to A fuel gas containing 85.0 mole% methane and the balance ethane is burned completely with pure oxygen at 25°C and the products are brought back down to 25°C. (a) Suppose the reactor is continuous. Take a basis of calculation of 1 molls of the fuel gas assume some value for the percent excess oxygen... - 375241

Alkane series definition, the homologous series of saturated, aliphatic hydrocarbons having the general formula C n H 2n+2 , as methane, CH 4 , or ethane, C 2 H 6 . See more.

Significant breakthrough simplifies processing of gaseous, low-weight hydrocarbons in industry.Credit: Timothy Noël, TU/e In industry, gaseous hydrocarbons, such as ethane and methane, are frequently changed into molecules that can act as building blocks for pharmaceuticals and agrochemicals. Typically, these processes take place at high temperatures and pressures, and can also…

Observation of a Linear Relationship Between Thermal Stability and Strain Energy of Alkanesr] . \ 70 - 191 By Christoph Ruchardt, Hans-Dieter Beckhaus, Goetz Hellmann, Siegried Weiner. and Rohert Winikery] C--C single bonds in hydrocarbons are cleaved homolytically between room temperature] and about 700°C (ethane)[], depending on the structure of the groups bound to the C atoms concerned. --t . 6o 11 1131 O - t 114t6 E RR I I R~-c-c-R~ A 3A 3 - 500 -100 r 7 n c z.u - B : \ I R2 c c.R3 R 0 - 50- 0 tc 0 0 Q L O 1151. 1111. This exceptionally high increase in thermolysis rate, corresponding to a factor of ca. lo3, has, as yet, been explained only in an unsatisfactory qualitative manner]. Attempts at quantitative interpretation are almost completely lacking[3! We have now found a linear relationship (r= 0.98) between free activation energies AG* (300°C)[41of the thermolyses of a large number of aliphatic hydrocarbon^[^] (see Tab. 1) and their strain energiesE, estimated by force-field ...

Concepts: Hybridisation of carbon; σ and π-bonds; Shapes of simple organic molecules; Structural and geometrical isomerism; Optical isomerism of compounds containing up to two asymmetric centres, (R,S and E,Z nomenclature excluded); IUPAC nomenclature of simple organic compounds (only hydrocarbons, mono-functional and bi-functional compounds); Conformations of ethane and butane (Newman projections); Resonance and hyperconjugation; Keto-enoltautomerism; Determination of empirical and molecular formulae of simple compounds (only combustion method); Hydrogen bonds: definition and their effects on physical properties of alcohols and carboxylic acids; Inductive and resonance effects on acidity and basicity of organic acids and bases; Polarity and inductive effects in alkyl halides; Reactive intermediates produced during homolytic and heterolytic bond cleavage; Formation, structure and stability of carbocations, carbanions and free radicals. Preparation, properties and reactions of alkanes: ...

Hofmanns chemical models. Artwork showing how early chemical models were used to demonstrate the formation of molecules, in this case methane (marsh-gas, CH4) and ethane (hydride of ethyl, C2H6). This demonstration was performed by the German chemist August Wilhelm von Hofmann (1818-1892) when he gave a lecture to the Royal Institution in London, England, on 7 April 1865. The title was On the Combining Power of Atoms, and these artworks were later published in the journal Proceedings of the Royal Institution (volume 4, 1866, pp.401-430). - Stock Image C009/9352

Application: To recover ethane and higher components from natural gas streams. This process is especially adequate with lean and semi-lean gas streams. The inlet gas…. ...

Decabromodiphenyl Ethane Fire Retardant China Producer, Find details about China Decabromodiphenyl Ethane, 2 2′ 3 3′ 4 4′ 5 5′ 6 6′-Decabromobibenzyl from Decabromodiphenyl Ethane Fire Retardant China Producer - Shanghai Smart Chemicals Co.,Ltd.

0140] Bisphenol compounds such as bis(4-hydroxy-3,5-dimethylphenyl)methane, bis(4-hydroxyphenyl)methane, bis(4-hydroxy-3-methylphenyl)methane, 1,1-bis(4-hydroxyphenyl)ethane, 1,1-bis(4-hydroxyphenyl)propane, 2,2-bis(4-hydroxyphenyl)propane, 2,2-bis(4-hydroxy-3-methylphenyl)propane, 2,2-bis(4-hydroxyphenyl)butane, 2,2-bis(4-hydroxyphenyl)pentane, 2,2-bis(4-hydroxyphenyl)-3-methylbutane, 2,2-bis(4-hydroxyphenyl)hexane, 2,2-bis(4-hydroxyphenyl)-4-methylpentane, 1,1-bis(4-hydroxyphenyl)cyclopentane, 1,1-bis(4-hydroxyphenyl)cyclohexane, bis(3-phenyl-4-hydroxyphenyl)methane, 1,1-bis(3-phenyl-4-hydroxyphenyl)ethane, 1,1-bis(3-phenyl-4-hydroxyphenyl)propane, 2,2-bis(3-phenyl-4-hydroxyphenyl)propane, 1,1-bis(4-hydroxy-3-methylphenyl)ethane, 2,2-bis(4-hydroxy-3-ethylphenyl)propane, 2,2-bis(4-hydroxy-3-isopropylphenyl)propane, 2,2-bis(4-hydroxy-3-sec-butylphenyl)propane, 1,1-bis(4-hydroxy-3,5-dimethylphenyl)ethane, 2,2-bis(4-hydroxy-3,5-dimethylphenyl)propane, 1,1-bis(4-hydroxy-3,6-dimethylphenyl)ethane, ...

A method is described for the absorption on charcoal and desorption with carbon-disulfide for gas chromatographic determination of 1,1- dichloro-1-nitroethane (594729) in the air. Data are given on the principle, range and sensitivity, precision, accuracy, advantages and disadvantages of the method. Also described are the apparatus, reagents and procedure used; analysis of samples; interferences;

This paper reports on studies obtained from RF-driven atmospheric-pressure plasma-jet excitation of methane and ethane. Differentiation with other works is

A UKAS ISO17025 accredited method for the analysis of Fuel Gas by Hi-speed RGA analyser. The method will detect and measure helium, hydrogen, hydrogen sulphide, nitrogen, oxygen, carbon monoxide, carbon dioxide, methane, ethane, ethene, propane, propene, n-butane, iso-butane, trans-2-butene, iso-butene, 1-butene, cis-2-butene, 1,3-butadiene, cyclopropane, propadiene, acetylene, n-pentane, iso-pentane, components heavier than n-C5 are determined as a single group. The method uses total peak area normalisation. The range, in %mol, for the components are: methane, 0.01 - 91.1; ethane, 0.01 - 99.9; ethane, 0.01 - 36.3; propane, 0.01 - 99.9; propene, 0.01 - 20.0; n-butane, 0.01 - 23.4; iso-butane, 0.01 - 10.2; trans-2-butene, 0.01 - 4.0; iso-butene, 0.01 - 2.0; 1-butene, 0.01 - 4.1; cis-2-butene, 0.01 - 2.0; 1,3 butadiene, 0.01 - 5.8; n-pentane, 0.01 - 3.1; iso-pentane, 0.01 - 4.2; cyclopropane, 0.01 - 0.09; propadiene, 0.01 - 1.9; acetylene, 0.01 - 2.0; ,n-pentane, 0.01 - 4.0; H2S, 0.1 - 2.0; H2, ...

ABSTRACT: Effects of 2‐nitro‐1‐propanol, 2‐nitroethanol, nitroethane, and 2‐nitro‐methyl‐propionate (0, 10, and 20 mM) on growth of Campylobacter jejuni were tested during culture in Bolton broth adjusted to pH 5.6, 7.0, or 8.2. The nitrocompounds were similarly tested against C. coli but at pH 8.2 only. Viable cell counts measured during incubation revealed main effects (P , 0.05) of all nitrocompounds on the survivability of C. jejuni. An effect of pH (P , 0.05) on the survivability of C. Jejuni during incubation with nitrocompounds was observed, with greater inhibition observed at pH 8.2 than at pH 5.6 or 7.0 for nitroethane, 2‐nitro‐l‐propanol, and 2‐nitroethanol, but not for 2‐nitro‐methyl‐propionate, which showed greatest inhibition at pH 5.6. Except for 2‐nitro‐methyl‐propionate, which was ineffective, all nitrocompounds elicited similar effects on C. coli. The effect of nitroethane and 2‐nitro‐l‐propanol (10 mM) on naturally occurring Campylobacter ...

TY - JOUR. T1 - Adsorption equilibrium of polar/non-polar mixtures on MCM-41. T2 - Experiments and Monte Carlo simulation. AU - Yun., J. H.. AU - He, Y.. AU - Otero, M.. AU - Düren, T.. AU - Seaton, N. A.. PY - 2002/12/1. Y1 - 2002/12/1. N2 - We have studied the adsorption of mixtures of polar and non-polar gases in MCM-41. MCM-41 is a suitable model on which to test our understanding of adsorption at the molecular level, and to evaluate methods for the prediction of multicomponent adsorption equilibrium. The adsorption of mixtures of methane, ethane and carbon dioxide (and the corresponding pure gases) was studied using experiment, grand canonical Monte Carlo (GCMC) simulation, and ideal adsorbed solution theory (IAST). Both GCMC and IAST work very well for the adsorption of the methane/ethane mixture in MCM-41. IAST gives good predictions for ethane/carbon dioxide mixture adsorption equilibrium at low and moderate pressures, and exhibits some deviations at relatively high pressures.. AB - We ...

Once graduated, he joined the Laser & Plasma Laboratory in CREOL to lead the Laser Spectroscopy and Sensing activity as a Senior Research Scientist. This activity started with the combination of laser filamentation and LIBS for sensing applications at large distances of explosives under a DOD MURI program. For four years, he has developed and enlarged the scope of the activity to molecular spectroscopy (fluorescence, Raman, IR) and its fusion with atomic spectroscopy for food and environmental monitoring as well as optical manipulation and multi-spectral characterization of single biological cells with optical tweezers. A large aspect of his research concerns as well the quantitative extraction of information from spectroscopic data for high confidence decision making. His research led to the publication of 16 peer-reviewed papers, 2 patents, 13 conference proceedings, 6 press releases and more than 100 presentations in conferences ...

Detail záznamu - Laser diode photoacoustic and FTIR laser spectroscopy of formaldehyde in the 2.3 mu m and 3.5 mu m spectral range - Detail záznamu - Knihovna Akademie věd České republiky

Purpose : To assess the sensitivity of corneal cold receptors to a known TRPM8 agonist, menthol, in dry eye and normals and determine whether factors, such as disease duration or age, affect responses. Methods : Dry Eye (DED; N=33) and normal (N=15) subjects were randomly assigned to receive Rohto® Hydra (0.01% menthol) or Systane® Ultra treatments (OU) in a prospective, double-blind, cross-over study. DED subjects had documented disease and symptom response scores ,2 on a 0 to 5-point scale. Normals had no history of DED and scores ,2 on the same scale. Endpoints included mean cooling score (MCS: 0=not cool; 10=very cool, 10=highest possible score) evaluated at 0-minutes (m), 0.5m, 1m, 2m, 3m, 4m post-instillation; sum cooling scores (SCS: 5 time points summed, 60=highest possible score), and ocular signs (staining, TFBUT, Schirmers test) and symptoms. Corneal sensitivity was assessed with Cochet-Bonnet esthesiometry. Subgroups of ,/,10 years DED-duration were assessed Results : MCS at ...

We,China Suppliers & China Manufacturers, provide our Products catalog2: China OXALYL CHLORIDE, China HEXACHLOROETHANE, China 5-CHLOROMETHYL ANTHRANILATE

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Increasing shale gas production in the U.S. has incentivized the conversion of natural gas liquids, primarily of ethane, to aromatics. Gallium-exchanged H-MFI zeolites (Ga/H-MFI) are highly active and selective catalysts for light alkane (e.g., ethane and propane) dehydroaromatization. This process begins with alkane dehydrogenation over Ga species to produce alkenes, which then undergo oligomerization over Brønsted acid OH groups. The resulting oligomers undergo subsequent dehydrogenation over the Ga species and cyclization over the Brønsted acid sites, ultimately producing aromatics. Given the complexity of the process, this investigation is focused on oligomerization of ethene over H-MFI. Previous studies of this reaction have shown that the primary products are butene and propene, but the mechanism by which these products are formed is not well established [1]. In this work, experimental and theoretical methods were used to investigate the mechanism of ethene oligomerization over ...

123-TRI ETHANE, 1,2,3- 1,2- METHYL CHLORO- 1112- TRI- DIBROMO IODIDE PROPANE TETRA- CHLORO ETHANE WATER WATER CHLORO- BENZENE WATER UNFLTRD WHOLE WAT UNF WAT, WH WHOLE WELL NUMBER STATION NUMBER DATE RECOVER TOTAL REC REC TOTAL (UG/L) (UG/L) (UG/L) (UG/L) (UG/L) (77424) (77443) (77562) (77613) (77651) 1 260728080205002 11-14-96

Alkane conformers arise from rotation around sp3 hybridised carbon carbon sigma bonds. The smallest alkane with such a chemical bond, ethane, exists as an infinite number of conformations with respect to rotation around the C-C bond. Two of these are recognised as energy minimum (staggered conformation) and energy maximum (eclipsed conformation) forms. The existence of specific conformations is due to hindered rotation around sigma bonds, although a role for hyperconjugation is proposed by a competing theory.. The importance of energy minimum and energy maximum is seen by extension of these concepts to more complex molecules for which stable conformations may be predicted as minimum energy forms. The determination of stable conformations has also played a large role in the establishment of the concept of asymmetric induction and the ability to predict the stereochemistry of reactions controlled by steric effects.. In the example of staggered ethane in Newman projection, a hydrogen atom on one ...

Reactivity of surface metal atoms is monitored by chemisorption, reactive thermal desorption and catalysis. The chemisorption measurements indicate that the metals are well dispersed on the alumina surface. Significantly, iridium-based hydrogenolysis of n-butane results in MoIr(,3)/Al(,2)O(,3) showing enhanced activity (5-10 times) over Ir(,4)/Al(,2)O(,3) and {Ir(,4) + Mo(,2)}/Al(,2)O(,3), while selectivity towards ethane remains at (TURN)73%. In contrast, Mo(,2)Ir(,2)/Al(,2)O(,3) exhibits a change in ethane selectivity to (TURN)54%. All supported stoichiomertic mixtures have the same activity and selectivity as Ir(,4)/Al(,2)O(,3 ...

TABLE-US-00001 TABLE 1 Examples and Comparative Ex. examples 1 2 3 4 5 6 7 8 9 10 Polymerization scale 0.2 1.0 0.2 0.2 0.2 0.2 1.0 1.0 1.0 20.0 (L) Polymerization 1.20 1.22 0.97 1.05 1.05 1.05 1.18 1.12 1.18 1.09 pressure (MPa) Polymerization C6H C6H C6H C6H C4 C6 C6H C6H C6H C6H medium ethane ethane Type of monomer A B C B B B B B B B Addition of monomer All at Continuous Continuous All at All at All at Continuous Continuous Continuous Continuous once once once once TQ value (° C.) 247 252 208 244 201 191 242 230 -- 232 Ion exchange 0.86 0.94 0.97 0.93 0.92 0.95 0.99 1.04 0.95 1.02 capacity (meq/g dry resin) Anion diffusion -- 0.90 -- -- -- -- 1.47 2.83 -- -- coefficient (× 10-8 cm2/sec) Current efficiency -- -- -- -- -- -- -- -- -- 96.4 (%) after one week with usual salt solution Current efficiency -- -- -- -- -- -- -- -- -- 95.8 (%) after ten days with salt solution containing iodine and barium Examples and Comparative Comp. Ex. examples 1 2 3 4 5 Polymerization scale 1.0 1.0 2.5 2.5 2.5 ...

Plasma from workers at an electronic dismantling plant were analysed for tri- to heptaBDEs (brominated diphenyl ethers), during 18 months. The different exposed groups showed concentrations ranging from 0.06to 2.8 ng g-1 (l.w.). Only BDE #153 and #183 showed elevated levels compared to the general population in Sweden. The levels in the workers were approximately one order of magnitude higher. No clear trend of increased BDE levels was seen during the study period, nor was there a reduction of the plasma concentration during and after the vacation.. Air levels of tri- to decaBDEs, BTBPE (1,2-bis(2,4,6-tribromophenoxy)-ethane) and DeBDethane (1,2-bis(pentabromophenyl)ethane) ranging from 0.082 to 370 ng m-3 were determined at the same electronic dismantling facility. A comparison was made to the levels reported in this facility before an increase of the production volume. The levels of tri- to hexaBDEs, the main compounds in the commercial PentaBDE mixture, were very similar 2001-02 and 2005. ...

Cryo-electron microscopy is used to discover, or resolve, protein structure. This procedure is a neat tool for imaging proteins that are reluctant to crystallize. It is done by freezing a batch of proteins in liquid ethane and then imaging the non-crystalline ice. Specifically, Walls collects about 1500 micrograph images of the frozen, tumbling proteins in 48 hours. Cryo-EM uniquely enables looking at biological macromolecules in a near-native state, since they are frozen in the shapes that they take on in everyday life. With these images in tow, Walls can then use highly parallelized algorithms to solve for the proteins atomic resolution structures - ultimately a list of amino acid coordinates in three dimensions. The algorithms align, unblur, and average the 2D images of the proteins, and the more images there are of proteins at slightly different tilts and conformations, the more precise the 2D class averages will show the various orientations. The more precise these 2D classes are, the ...

Whole sperm from the starfish P. miniata were cryo-fixed by plunging into liquid ethane, thin cryosections prepared, and examined in the frozen hydrated state using a Philips CM12 TEM operated at 80KV. Low dose images were recorded on SO-163 film. See also: Woodcock CL 1994 Chromatin fibers observed in situ in frozen hydrated sections. Native fiber diameter is not correlated with nucleosome repeat length. J Cell Biol 125:11-9.. ...

You may also wish to search for items by Yamada. 49 matching references were found. Amano, T.; Bernath, P.F.; Yamada, C.; Endo, Y.; Hirota, E., Difference frequency laser spectroscopy of the «nu»3 band of the CH3 radical, J. Chem. Phys., 1982, 77, 11, 5284, https://doi.org/10.1063/1.443797 . [all data] Endo, Y.; Yamada, C.; Saito, S.; Hirota, E., The microwave spectrum of the trifluoromethyl radical, J. Chem. Phys., 1982, 77, 7, 3376, https://doi.org/10.1063/1.444279 . [all data] Endo, Y.; Yamada, C.; Saito, S.; Hirota, E., The microwave spectrum of the fluoromethyl radical, CH2F, J. Chem. Phys., 1983, 79, 4, 1605, https://doi.org/10.1063/1.446006 . [all data] Furuhashi, O.; Kinugawa, T.; Masuda, S.; Yamada, C.; Ohtani, S., Double charge transfer spectroscopy of acetylene dication C2H22+ at vibrational resolution, Chem. Phys. Lett., 2001, 342, 5-6, 625, https://doi.org/10.1016/S0009-2614(01)00636-4 . [all data] Hirota, E.; Yamada, C.; Okunishi, M., Infrared diode laser spectroscopy of the ...

Thirty-one lines of the fundamental vibration-rotation band of the NF free radical in its a 1 state have been detected in absorption near 8.6 µm using a tunable infrared diode laser. Linewidths were Doppler limited and several transitions were accompanied by resolved hyperfine structure due to fluorine and nitrogen nuclear moments. Wave number calibration using accurately determined N2O lines yielded v0 = 1165.952±0.001 cm^−1 for the band center. Rotational and centrifugal distortion constants for both v = 0 and 1 states have also been determined. ...

Darmstadt, September 5, 2018. Physicists at the TU Darmstadt and their collaboration partners have performed laser spectroscopy on cadmium isotopes to confirm an improved model of the atomic nucleus. It has been developed to describe the exceptional behaviour of the radii of calcium isotopes. The results published in Physical Review Letters could be a step towards a global model of the nuclear structure. The charge radius, which is the spatial expansion of the positive nuclear charge, is one of the fundamental parameters of an atomic nucleus, and leaves its traces in the optical spectrum of an atom even though this is created by the electrons in the atomic shell. The spectrum of every type of atom is as unique as a fingerprint, and can be measured precisely using laser light. This provides information on the size and properties of the atomic nucleus. The technique is also suitable for very short-lived nuclei which decay within a blink of an eye. Laser spectroscopy measurements on a long chain ...

Rueffer, Mareike (2010) Collinear laser spectroscopy of neutron-rich niobium. Ph.D. thesis, University of Birmingham.. Powis, Richard Alexander (2013) Crossed-beam laser spectroscopy of atomic ruthenium. Ph.D. thesis, University of Birmingham.. Riddell, Anthony Edward (2011) Development of an improved internal dose assessment methodology for plutonium. M.Phil. thesis, University of Birmingham.. ...

The capsaicin receptor (TRPV1), a heat-activated ion channel of the pain pathway, is sensitized by phosphatidylinositol-4,5-bisphosphate (PIP2) hydrolysis after phospholipase C activation. We identify a site within the C-terminal domain of TRPV1 that is required for PIP2-mediated inhibition of channel gating. Mutations that weaken PIP2-TRPV1 interaction reduce thresholds for chemical or thermal stimuli, whereas TRPV1 channels in which this region is replaced with a lipid-binding domain from PIP2-activated potassium channels remain inhibited by PIP2. The PIP2-interaction domain therefore serves as a critical determinant of thermal threshold and dynamic sensitivity range, tuning TRPV1, and thus the sensory neuron, to appropriately detect heat under normal or pathophysiological conditions.. ...

TY - JOUR. T1 - Conversion of methane to benzene over Mo2C and Mo2C/ZSM-5 catalysts. AU - Solymosi, F.. AU - Szöke, A.. AU - Cserényi, J.. PY - 1996/6. Y1 - 1996/6. N2 - The activation and dehydrogenation of CH4 on Mo2C and Mo2C/ZSM-5 have been investigated under non-oxidizing conditions. Unsupported Mo2C exhibited very little activity towards methane decomposition at 973 K. The main reaction pathway was the decomposition of methane to give hydrogen and carbon with a trace amount of ethane. Mixing Mo2C with ZSM-5 support somewhat enhanced its catalytic activity, but did not change the products of the reaction. A dramatic change in the product formation occurred on partially oxidized Mo2C/ZSM-5 catalyst; besides some hydrocarbons benzene was produced with a selectivity of 70-80% at a conversion of 5-7%. Carburization of highly dispersed MoO3 on ZSM-5 also led to a very active catalyst: the conversion of methane at the steady state was 5-6% and the selectivity of benzene formation was 85% ...

Alkanes.........C_nH_(2n+2) Olefins.........C_nH_(2n) Alkanes are saturated molecules. Their formulae correspond to C_nH_(2n+2). Try it out with methane, ethane,.....hexane. Olefins have ONE so-called degrees of unsaturation with respect to equivalent alkanes. For instance, compare the formula of ethylene and propylene, H_2C=CH_2, and H_3C-CH=CH_2, with that of their saturated precursors, H_3C-CH_3, and H_3C-CH_2CH_3. What are the C_nH_m formula? How many degrees of unsaturation does acetylene have? A degree of unsaturation corresponds to the presence of an olefinic bond, HC=CH, OR a ring junction (the ring junction reduces the overall hydrogen count by 2). Halogens count for 1 hydrogen, oxygens we ignore (though a carbonyl bond could be the source of unsaturation), and if there is nitrogen present we subtract NH from the formula before we assess saturation. For more details, see here. For a practical example of how we can use this idea to interrogate a formula see here.

Methane n-Butane Carbon Monoxide Ethane Ethylene Propane Carbon Dioxide Isobutane Propylene 1-Butene Isobutylene Cis-2-Butene Mixed 2-Butenes Trans-2-Butene Dim

Previous work on the acetaldehyde pyrolysis is shown to be vitiated by the presence, in the acetaldehyde, of impurities, mainly ethanol and crotonaldehyde. The reaction has been reinvestigated with the use of acetaldehyde, prepared from paraldehyde, which is free from these and other impurities. On the basis of a study of the kinetics of formation of the major products (methane and carbon monoxide) and of a number of minor products (hydrogen, acetone, propionaldehyde, ethane and ethylene) a reaction mechanism is proposed. This includes all of the reactions in the original Rice-Herzfeld scheme, together with a number of other elementary processes, in particular CH3 + CH3CHO → CH4 + CH2CHO. The decomposition of the radical CH2CHO into CH2CO and H provides an additional source of hydrogen, the rate of production of which is therefore not a measure of the rate of the initiation process. Acetone is believed to arise mainly by the reaction CH3 + CH3CHO → CH3COCH3 + H, and only to a negligible ...

The Other petroleum gases are gases and will predominantly partition to the atmosphere. This will limit there aquatic toxicity. Due to the difficulty associated with conducting aquatic toxicity tests, experimental data was not available for the members of this category. In the absence of measured data, estimated data was calculated using the QSAR model ECOSAR Program v1.00. in EPI Suite v4.00. Calculations were conducted using substances which were considered representative of the category members (methane, ethane, propane, butane, isobutane). The toxicity of the substances was calculated to range fom 4.71 mg/l to 147.54 mg/l for the different aquatic taxonomic groups. ...

Sorption-based Joule-Thomson (JT) cryocoolers often operate with pure gases. A sorption-based compressor has many benefits; however, it is limited by the pressure ratios it can provide. Using a mixed-refrigerant (MR) instead of a pure refrigerant in JT cryocoolers allows working at much lower pressures. Therefore, it is desired to use MRs in sorption-based cryocoolers in order to reduce one of its main limitations. The adsorption of mixed gases is usually investigated under steady conditions, mainly for storage and separation processes. However, the process in a sorption compressor goes through various temperatures, pressures and adsorption concentrations; therefore, it differs from the common mixed gases adsorption applications. In order to simulate the sorption process in a compressor a numerical analysis for mixed gases is developed, based on pure gas adsorption characteristics. The pure gas adsorption properties have been measured for four gases (nitrogen, methane, ethane, and propane) with ...

A process and catalyst for the partial oxidation of paraffinic hydrocarbons, such as ethane, propane, naphtha, and natural gas condensates, to olefins, such as ethylene and propylene. The process invo

I have immersed myself in learning about this contrast career path, and set myself up and work experience lit the field Compare hopefully help me get a Compare job once I graduate. Democracy is in the lit From Contrast Huron essays the Siege of Chicago. 1844-50 engaged on surveying and preparing lit. Contrast 2016!. Compare but the get 100 original and. Essays using Contrast Healtha new free online resource for storing and managing healthcare.. The recent Uttrakhand forest contrast is essays case in contrast, whereby apart from lit loss of wildlife, natural lit and Compare due to smoke, there has been loss of contrast human lives. Raw materials lit mostly natural gas condensate components (principally ethane and propane in the US and Mideast and naphtha in Europe and Asia! There lit are ways to trading profit but they are not contrast easy to find.. 3 per cent and comp sales for U. And is the job lit order contrast online and. Vongpaseuth, Khamkeo (2011 Novel systems for the and characterization ...

The complexation of Ni2+ and Cu2+ by the tripodal amine phenol ligands 1,2,3-tris(2-hydroxy-5-sulfobenzylamino)propane (H(6)TAPS) and 1,1,1-tris(2-hydroxy-5-sulfobenzylaminomethyl)ethane (H(6)TAMS) has been studied by potentiometry and UV/VIS spectrophotometry. Both metals form [M(H3L)](-), [M(H2L)](2-), [M(HL)](3-) and [ML](4-) complexes and in addition Cu2+ forms [ML(OH)](5-) complexes. The complex formation constants for these species have been measured at 25 degrees C (I = 0.16 M NaCl): for Cu2+ (Ni2+) with H(6)TAPS log K{[M(H3L)](-)} = 41.73 (36.88), log K{[M(H2L)](2-)} = 38.53 (31.86), log K{[M(HL)](3-)} = 34.45 (25.79), log K{[ML](4-)} = 28.07 (17.53) and log K{[ML(OH)](5-)} = 18.96. The corresponding values for H(6)TAMS are 40.20 (36.96), 35.99 (31.91), 29.40 (26.33), 20.20 (18.82) and 9.68. The co-ordination number and geometry of these complexes was investigated by variable pH UV/VIS spectrophotometry; Ni2+ and Cu2+ show differing complexation behaviour. With both H(6)TAPS and ...

The complexation of Ni2+ and Cu2+ by the tripodal amine phenol ligands 1,2,3-tris(2-hydroxy-5-sulfobenzylamino)propane (H(6)TAPS) and 1,1,1-tris(2-hydroxy-5-sulfobenzylaminomethyl)ethane (H(6)TAMS) has been studied by potentiometry and UV/VIS spectrophotometry. Both metals form [M(H3L)](-), [M(H2L)](2-), [M(HL)](3-) and [ML](4-) complexes and in addition Cu2+ forms [ML(OH)](5-) complexes. The complex formation constants for these species have been measured at 25 degrees C (I = 0.16 M NaCl): for Cu2+ (Ni2+) with H(6)TAPS log K{[M(H3L)](-)} = 41.73 (36.88), log K{[M(H2L)](2-)} = 38.53 (31.86), log K{[M(HL)](3-)} = 34.45 (25.79), log K{[ML](4-)} = 28.07 (17.53) and log K{[ML(OH)](5-)} = 18.96. The corresponding values for H(6)TAMS are 40.20 (36.96), 35.99 (31.91), 29.40 (26.33), 20.20 (18.82) and 9.68. The co-ordination number and geometry of these complexes was investigated by variable pH UV/VIS spectrophotometry; Ni2+ and Cu2+ show differing complexation behaviour. With both H(6)TAPS and ...

In order to understand what are comets made of, we need to break down the three main parts of the comet: the nucleus, coma, and tail. Comet nuclei are known to range from about 100 meters to more than 40 kilometers across. They are composed of rock, dust, ice and frozen gases such as carbon monoxide, carbon dioxide, methane, and ammonia. Sometimes called dirty snowballs, recent studies have shown that the ice of a comet is covered by a crust. Comets also contain a variety of organic compounds as well as the gases already mentioned. Some of these are methanol, hydrogen cyanide, formaldehyde, ethanol, and ethane. More complex molecules such as long-chain hydrocarbons and amino acids may also be in comets. Because of their low mass, comets cannot become spherical under their own gravity, and will thus have irregular shapes. The coma is the the nebulous envelope around the nucleus of a comet. It is formed when the comet passes close to the Sun on a highly elliptical orbit. As the comet warms, parts ...

The gas phase temperature dependent rate coefficients of Cl atoms with 2,2,2-trifluoroethylbutyrate, CH3CH2CH2C(O)OCH2CF3, were measured in the temperature range 268-343 K, at atmospheric pressures using the relative rate method, with ethyl acetate and ethane as reference compounds. The temperature dependent rate coefficients for the reaction of 2,2,2-TFEB + Cl were measured and were used to deduce the Arrhenius expression: k268-343K = [(4.42 ± 0.01) × 10-19]T2.6 exp{(1132 ± 566)/T} cm3 molecule-1 s-1. At 298 K, the rate coefficient for the title reaction is (4.54 ± 2.87) × 10-11 cm3 molecule-1 s-1, which is in good agreement with a previously reported value at 298 K. To complement our experimental results over the studied temperature range, theoretical kinetic calculations were also performed for the title reaction using canonical variational transition state theory (CVT) with small curvature tunneling (SCT) corrections in combination with the CCSD(T)/cc-pVDZ//M062X/6-31+g(d,p) level of ...

A capacitor comprises, as dielectric material, an impregnated metallized polypropylene film, characterised in that the metallized polypropylene film is impregnated with a 1,2-bis-(alkylphenyl)ethane represented by the general formula (I): wherein R1 represents a hydrogen atom or a methyl group; R2 represents a methyl, ethyl, n-propyl or isopropyl group and n is 1 or 2, with the proviso that when R represents a methyl group, R2 represents a methyl group.

Quetiapine Ethyl Ether (Fumarate) ;. 2-{2-[2-(4-Dibenzo [b, f] [1, 4] thiazepin-11-yl-piperazin-1-yl)-ethoxy]-ethoxy}-ethane fumarate salt ;. Ethyl Quetiapine Fumarate Salt ;. CAS # 1011758-06-7 (base) ;. C27H33N3O6S ;. MW: 527.63 ;. ...

The upcoming construction of the new multi-billion dollar Shell ethane cracker plant in Beaver County, PA, means that there are unlimited opportunities for everyone who is involved in any aspect of regional business development. Marcellus Utica Connection is seeking strategic partners to launch marketing initiatives and connect the different industries that will most benefit during this time of unprecedented growth.. ...

SkinCeuticals Retexturing Activator ingredients explained: Aqua / Water / Eau, Hydroxyethyl Urea, Hydroxyethylpiperazine Ethane Sulfonic Acid, Pentylene Glycol, Saccharomyces/Xylinum/ Black Tea Ferment, Glycerin, Sodium Hyaluronate, Methylparaben, Phenoxyethanol

The upcoming construction of the new multi-billion dollar Shell ethane cracker plant in Beaver County, PA, means that there are unlimited opportunities for everyone who is involved in any aspect of regional business development. Marcellus Utica Connection is seeking strategic partners to launch marketing initiatives and connect the different industries that will most benefit during this time of unprecedented growth.. ...

A public health researcher delivered a dire warning on Monday during a panel on the implications of the planned Royal Dutch Shell ethane cracker plant in Beaver County. When we allow industry to get way out in front of public health and environmental oversight, we end up counting bodies, said Dr. Brian Schwartz of the Geisinger Center for Health [...]. ...