A process for the preparation of polyolefin which comprises polymerizing or copolymerizing olefin in the presence of a catalyst for olefin polymerization comprising (A) a metallocene compound of a transition metal selected from the Group IVB of the periodic table, and (B) an organoaluminum oxy-compound; wherein the organoaluminum oxy-compound (B) is added to the polymerization system in the form of a slurry in an aliphatic hydrocarbon or alicyclic hydrocarbon, and the polymerization is carried out in the presence of the aliphatic hydrocarbon diluent or an alicyclic hydrocarbon diluent having a boiling point below 100 C. In an embodiment of the invention a polymer solution containing the resulting polyolefin obtained from the polymerization process is fed to a separation zone kept at a temperature of not lower than the upper cloud point of the polymer solution to separate the polymer solution into a lower phase portion containing the polyolefin in a high concentration and an upper phase portion, so as
Boydston, Andrew J. and Holcombe, Thomas W. and Unruh, David A. et al. (2009) A direct route to cyclic organic nanostructures via ring-expansion metathesis polymerization of a dendronized macromonomer. Journal of the American Chemical Society, 131 (15). pp. 5388-5389. ISSN 0002-7863. PMCID PMC2765492. https://resolver.caltech.edu/CaltechAUTHORS:20090810-102905437 Xia, Yan and Boydston, Andrew J. and Yao, Yefeng et al. (2009) Ring-Expansion Metathesis Polymerization: Catalyst-Dependent Polymerization Profiles. Journal of the American Chemical Society, 131 (7). pp. 2670-2677. ISSN 0002-7863. PMCID PMC2658644. https://resolver.caltech.edu/CaltechAUTHORS:20090902-085242708 ...
This chapter provides an update on the current knowledge about anaerobically hydrocarbon-degrading microorganisms, the reactions involved, and recent insights into the underlying genetics and regulatory mechanisms, and it describes the suitability of growth studies with crude oil as model systems. However, anoxic conditions prevail in many natural environments, such as soils, groundwater aquifers, freshwater and marine sediments, and oil reservoirs. Early reports of the anaerobic oxidation of alkylbenzenes in microcosms and enrichment cultures and in situ biodegradation of crude oil in anoxic reservoirs provided evidence that anaerobic hydrocarbon oxidation indeed occurred. Anaerobic hydrocarbon oxidation can also be coupled to phototrophic energy conservation, as was demonstrated with the toluene-degrading Blastochloris sulfoviridis ToP1. During anaerobic growth with crude oil, strain HxN1 formed succinate derivatives of C4 to C8 n-alkanes and alicyclic hydrocarbons. Identification of
The C-O and C-S bonds break in the side chains of aromatic and alicyclic hydrocarbons. The content of primary (Cp) and the sum of secondary and quaternary (Csq) carbons was increased, while the content of tertiary (Ct) and aromatic carbons (Car) declined. The high-molecular poly-alicyclic and polyaromatic components had lost the straight and branched aliphatic hydrocarbons, and then were transformed into coke like substance -- carbene-carboids.
Alicyclic hydrocarbons in which three or more of the carbon atoms in each molecule are united in a ring structure and each of the ring carbon atoms is joined to two hydrogen atoms or alkyl groups. The simplest members are cyclopropane (C3H6), cyclobutane (C4H8), cyclohexane (C6H12), and derivatives of these such as methylcyclohexane (C6H11CH3). (From Sax, et al., Hawleys Condensed Chemical Dictionary, 11th ed ...
METHYLCYCLOHEXANE (ALICYCLISCHE KOHLENWASSERSTOFFE); DEHYDRIERUNG (CHEMISCHE REAKTIONEN); CHEMISCHE KINETIK; WASSERSTOFF (BRENNSTOFFTECHNOLOGIE); MODELLE UND MODELLUNTERSUCHUNG (TECHNISCHE CHEMIE UND VERFAHRENSTECHNIK); METHYL CYCLOHEXANES (ALICYCLIC HYDROCARBONS); DEHYDROGENATION (CHEMICAL REACTIONS); CHEMICAL KINETICS; HYDROGEN (FUEL TECHNOLOGY); MODELS AND MODEL ANALYSIS (CHEMICAL TECHNOLOGY AND PROCESS ENGINEERING ...
TY - JOUR. T1 - Original method for the ring enlargement of cyclic ketones. AU - Laboureur, J.L.. AU - Krief, A.. PY - 1984/1/1. Y1 - 1984/1/1. N2 - Thallium ethoxide in chloroform was found to be a particularly valuable combination for the rearrangement of β-hydroxyselenides to ketones.. AB - Thallium ethoxide in chloroform was found to be a particularly valuable combination for the rearrangement of β-hydroxyselenides to ketones.. UR - http://www.scopus.com/inward/record.url?scp=0001549454&partnerID=8YFLogxK. M3 - Article. AN - SCOPUS:0001549454. VL - 25. SP - 2713. EP - 2716. JO - Tetrahedron Letters. JF - Tetrahedron Letters. SN - 0040-4039. IS - 25. ER - ...
Website created by the Main Library of the Silesian University of Technology as part of the Innovative Economy Operational Program for 2011-2013, Measure 2.3. Investments related to the development of science IT infrastructure ...
TY - JOUR. T1 - Ring expansion of ketones to 1,2-keto-thioketals. AU - Knapp, Spencer. AU - Trope, Adrea F.. AU - Ornaf, Raphael M.. PY - 1980. Y1 - 1980. N2 - Treatment of cyclic ketones with (MeS)3C-Li, then CuClO4·4CH3CN, gives the corresponding ring expanded 1,2-keto-thioketals.. AB - Treatment of cyclic ketones with (MeS)3C-Li, then CuClO4·4CH3CN, gives the corresponding ring expanded 1,2-keto-thioketals.. UR - http://www.scopus.com/inward/record.url?scp=0008581846&partnerID=8YFLogxK. UR - http://www.scopus.com/inward/citedby.url?scp=0008581846&partnerID=8YFLogxK. U2 - 10.1016/S0040-4039(00)77842-7. DO - 10.1016/S0040-4039(00)77842-7. M3 - Article. AN - SCOPUS:0008581846. VL - 21. SP - 4301. EP - 4304. JO - Tetrahedron Letters. JF - Tetrahedron Letters. SN - 0040-4039. IS - 45. ER - ...
When I got this gorgeous pendant from LeAnn of Summers Studio, I instantly thought of flowers at night, against the dreamy dark blue sky. They seem to dance and have a life of their own. I strung them against browns (twigs, stems , and mulch), and blues of the highlights that bounce off the petals by the light of the moon ...
The active oxygen content of the non-cyclic peroxides used was measured by placing 20 ml of glacial acetic acid in a 200 ml round-bottomed flask fitted with a ground glass joint and an inlet tube for nitrogen gas. Nitrogen gas was then passed over the surface of the liquid. After 2 minutes, 4 ml of 770 g/l potassium iodide solution was added, and a sample containing approximately 1.5 meq of active oxygen was added to the reaction mixture with mixing. The reaction mixture was allowed to stand for at least 1 minute at 25*C at S^C. The reaction mixture was then nitrated with a 0.1 N sodium thiosulfate solution to colourless end point, with 3 ml of 5 g/l starch solution being end towards the end of the titration. A blank should be run alongside this titration. Non-cyclic active oxygen can be calculated as indicated above. The amount of cyclic ketone peroxide active oxygen equals the total amount of active oxygen minus the non-cyclic active oxygen ...
P-24.2.1 Monospiro alicyclic ring systems. Mono spiro parent hydrides consisting of two saturated cycloalkane rings are named by placing the nondetachable prefix spiro before the name of the unbranched acyclic hydrocarbon with the same total number of skeletal atoms. The number of skeletal atoms linked to the spiro atom in each ring is indicated by arabic numbers separated by a full stop, cited in ascending order and enclosed in square brackets; this descriptor (called in these recommendations the von Baeyer spiro descriptor) is placed between the spiro prefix and the name of the acyclic alkane. Numbering starts in the smaller ring, if one is smaller, at a ring atom next to the spiro atom and proceeds first around that ring, then through the spiro atom and around the second ring.. ...
Min.medicin.dk er en del af Medicin.dk. Medicin.dk leverer information om medicin til hele Danmark. Medicin.dk ejes af Dansk Lægemiddel Information A/S (DLI A/S). Medicin.dk består af pro.medicin.dk til sundhedsfaglige, min.medicin.dk til borgere - og indlægssedler.dk , der indeholder indlægssedler i et let tilgængeligt format. Læs mere om Medicin.dk og organisationen bag navnet ...
Pro.medicin.dk er en del af Medicin.dk. Medicin.dk leverer information om medicin til hele Danmark. Medicin.dk ejes af Dansk Lægemiddel Information A/S (DLI A/S). Medicin.dk består af pro.medicin.dk til sundhedsfaglige, min.medicin.dk til borgere - og indlægssedler.dk , der indeholder indlægssedler i et let tilgængeligt format. Læs mere om Medicin.dk og organisationen bag navnet ...
Pro.medicin.dk er en del af Medicin.dk. Medicin.dk leverer information om medicin til hele Danmark. Medicin.dk ejes af Dansk Lægemiddel Information A/S (DLI A/S). Medicin.dk består af pro.medicin.dk til sundhedsfaglige, min.medicin.dk til borgere - og indlægssedler.dk , der indeholder indlægssedler i et let tilgængeligt format. Læs mere om Medicin.dk og organisationen bag navnet ...
Graduated from the University of York in 2014. During her placement year at AstraZeneca she worked on the manufacture of chiral amines via catalytic and flow processing methods. She also undertook a placement at the University of Nottingham looking at the synthesis and characterisation of materials which promote stem cell attachment for biomedical applications. She is currently working under the supervision of Profs. Jonathan Clayden and Kevin Booker-Milburn on the development of methodology for the ring-expansion of nitrogen heterocycles via aryl and vinyl migrations ...
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Male and female. They have been there since at least the start of november. The male is probaly the same individual, which has returned for about 12 years ...
Hydrocarbon exposure has been shown to play an important role in the development of renal dysfunction in several occupational settings. In this study, renal screening was performed in a group of paint sprayers with exposure to hydrocarbon-based paints, recruited from a car manufacturing plant where personal protective equipment was widely used. The hydrocarbon exposure scores and various markers of renal injury were compared between these subjects and a group of paint sprayers from a previous study who did not use personal protective equipment regularly. Cumulative hydrocarbon exposure scores were calculated from a validated questionnaire. Serum creatinine, urinary total protein, albumin, transferrin, retinol-binding protein, and N-acetylglucosaminidase were evaluated, Both groups experienced heavy hydrocarbon exposure but sprayers who regularly used personal protective equipment had significantly reduced exposure scores due to improved skin and respiratory protection. A significant number of ...
A Lewis base catalyzed ring expansion of isatin with 2, 2, 2-trifluorodiazoethane (CF3CHN2) is developed. It is characterized that the merge of tetramethylethylenediamine and CF3CHN2 generates reactive triazene intermediates, which construct substituted 3-hydroxy-4-(trifluoromethyl)quinolinones with high efficiency. Synthetic application of the procedure is broadened by 3-trifluormethylpyrazole fused 3-hydroxy-4-(trifluoromethyl)quinolinone synthesis ...
General Information: Country: Germany; Isolation: Anaerobic sewage sludge; Temp: Mesophile. Alicycliphilus denitrificans is able to degrade cyclohexanol and other alicyclic compounds under denitrifying conditions. ...
Naming Ketones - This Leah4sci tutorial video shows you how to name molecules containing a carbonyl in the middle of the chain using my puzzle piece approach to IUPAC nomenclature. Naming examples include simple and substituted ketones, multiple carbonyls and cyclic ketones. Part of a nomenclature Video Series!
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Medicin.dk - professionel er en del af Medicin.dk. Medicin.dk leverer information om medicin, sygdom og behandling til hele Danmark. Medicin.dk ejes af Dansk Lægemiddel Information A/S (DLI A/S). Medicin.dk består af Medicin.dk - professionel til sundhedsfaglige, Medicin.dk - borger til borgere - og Medicin.dk - indlægssedler, der indeholder indlægssedler i et let tilgængeligt format. Læs mere om Medicin.dk og organisationen bag navnet ...
Min.medicin.dk er en hjemmeside om medicin, sygdomme, undersøgelser og behandling skrevet i et let tilgængeligt sprog. Oplysningerne er målrettet dig, der er patient, pårørende eller ansat i sundhedssektoren. Min.medicin.dk er et arbejdsredskab, som anvendes af sosu-assistenter, sosu-hjælpere og andet personale, som arbejder i plejesektoren, på bosteder og lignende ...
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The responses of microbial communities to hydrocarbon exposures are complex and variable, driven to a large extent by the nature of hydrocarbon infusion, local environmental conditions, and factors that regulate microbial physiology (e.g., substrate and nutrient availability). Although present at low abundance in the ocean, hydrocarbon-degrading seed populations are widely distributed, and they respond rapidly to hydrocarbon inputs at natural and anthropogenic sources. Microbiomes from environments impacted by hydrocarbon discharge may appear similar at a higher taxonomic rank (e.g., genus level) but diverge at increasing phylogenetic resolution (e.g., sub-OTU [operational taxonomic unit] levels). Such subtle changes are detectable by computational methods such as oligotyping or by genome reconstruction from metagenomic sequence data. The ability to reconstruct these genomes, and to characterize their transcriptional activities in different environmental contexts through metatranscriptomic mapping, is
TY - JOUR. T1 - Association between polycyclic aromatic hydrocarbon exposure and peripheral blood mononuclear cell DNA damage in human volunteers during fire extinction exercises. AU - Andersen, Maria Helena Guerra. AU - Saber, Anne Thoustrup. AU - Clausen, Per Axel. AU - Pedersen, Julie Elbæk. AU - Løhr, Mille. AU - Kermanizadeh, Ali. AU - Loft, Steffen. AU - Ebbehøj, Niels. AU - Hansen, Åse Marie. AU - Pedersen, Peter Bøgh. AU - Koponen, Ismo Kalevi. AU - Nørskov, Eva-Carina. AU - Møller, Peter. AU - Vogel, Ulla Birgitte. PY - 2018. Y1 - 2018. N2 - This study investigated a number of biomarkers, associated with systemic inflammation as well as genotoxicity, in 53 young and healthy subjects participating in a course to become firefighters, while wearing personal protective equipment (PPE). The exposure period consisted of a 3-day training course where the subjects participated in various live-fire training exercises. The subjects were instructed to extinguish fires of either wood or wood ...
Fingerprint Dive into the research topics of Aromatic hydroxylation of indan by o-xylene-degrading rhodococcus sp. Strain DK17. Together they form a unique fingerprint. ...
Cyclohexanone is an aliphatic cyclic ketone. Cyclohexanone derivatives have potent pharmacological activity in the treatment of a broad spectrum of medical conditions (Puetz et al., 2003). The cyclohexanone moiety constitutes an important structural feature in several anti-inflammatory, analgesic, local anesthetic and antihistaminic drugs (Rajveer et al., 2010). As part of our studies in this area (Fatima et al., 2013; Hema et al., 2006), we have undertaken a single-crystal structure determination of the title compound.. In the title compound, Fig. 1, the cyclohexene ring (C9-C14) adopts an envelope conformation with atom C13 as the flap: puckering parameters (Cremer & Pople, 1975) are Q = 0.464 (3) Å, θ = 52.3 (4) °, and ϕ = 232.2 (4) °. Its mean plane makes a dihedral angle of 7.20 (12)° with the benzene ring (C1-C6).. In the crystal, hydrogen bonded chains running along the a-axis direction are generated by connecting neighbouring molecules via C-H···O hydrogen bonds (Table 1 and ...
Bill Evans (organometallics, not jazz) previously explored this reagent over a decade ago, marketing it as a souped-up SmI2 / HMPA. His study looked at cyclic ketones, which formed adducts with primary iodides in less than a minute with a healthy dose of TmI2(DME). Despite these exciting early results, it appears that thulium took a back burner to the samarium craze of the mid-00s, and only now gets its chance in the limelight ...
Shipping. Orders take 1-3 Business days to ship. Orders will begin processing the same day if we receive and accept payment that day. You will notified once processing has started and once your order has been shipped.. ...
Medicin.dk - professionel er en del af Medicin.dk. Medicin.dk leverer information om medicin, sygdom og behandling til hele Danmark. Medicin.dk ejes af Dansk Lægemiddel Information A/S (DLI A/S). Medicin.dk består af Medicin.dk - professionel til sundhedsfaglige, Medicin.dk - borger til borgere - og Medicin.dk - indlægssedler, der indeholder indlægssedler i et let tilgængeligt format. Læs mere om Medicin.dk og organisationen bag navnet ...
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Oliebaseret rens et et renseprodukt baseret på olie. Denne form for ansigtsrens er effektiv til at fjerne makeuprester og andet skidt, der sidder dybt i huden.
The reactivity of the bimetallic complex (Ph4P)2[W2(μ-Br)3Br6] ({W 2.5 W}7+, a′2e3) towards ring opening metathesis polymerization (ROMP) of norbornene (NBE) and some of its derivatives, as well as the mechanistically related metathesis polymerization of phenylacetylene (PA), is presented. Our results show that addition of a silver salt (AgBF4) is necessary for the activation of the ditungsten complex. Polymerization of PA proceeds smoothly in tetrahydrofuran (THF) producing polyphenylacetylene (PPA) in high yields. On the other hand, the ROMP of NBE and its derivatives is more efficient in CH2Cl2, providing high yields of polymers. 13C Cross Polarization Magic Angle Spinning (CPMAS) spectra of insoluble polynorbornadiene (PNBD) and polydicyclopentadiene (PDCPD) revealed the operation of two mechanisms (metathetic and radical) for cross-linking, with the metathesis pathway prevailing.
Linear hybrid block copolymers with well controlled molecular weights and narrow polydispersities were synthesized viaring-opening metathesis polymerization (ROMP) followed by ring-opening polymerization of amino acidN-carboxyanhydrides.
Epoxide hydrolases (EHs) are attractive enzymes for producing enantiopure epoxides and diols, but do not display enough stability when lysates or Escherichia coli whole cells are used as biocatalysts. In this work, an organic-solvent tolerant strain Rhodococcus ruber THdAdN was utilized to overexpress an epoxide hydrolase from Agrobacterium radiobacter (ArEH), using E. coli BL21(DE3) as a control ...
SWISS-MODEL Repository entry for A1B316 (PSUG_PARDP), Pseudouridine-5-phosphate glycosidase. Paracoccus denitrificans (strain Pd 1222)
SWISS-MODEL Repository entry for Q12SV8 (RL4_SHEDO), 50S ribosomal protein L4. Shewanella denitrificans (strain OS217 / ATCC BAA-1090 / DSM 15013)
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The cure kinetics of polydicyclopentadiene (pDCPD) prepared by ring-opening metathesis polymerization with three different concentrations of Grubbs catalyst was examined using differential scanning calirimetry (DSC). The experimental data were used to test several different phenomenological kinetic models. The data are best modeled with a model-free isoconversional method. This analysis reveals that the activation energy increases significantly for degree of cure greater than 60%. Catalyst concentration is shown to have a large effect on the cure kinetics ...
Our findings suggest that the association between PAH exposure and a cytokine storm may be mediated by AhR and NLRP3 expression among preschoolers.
How the Brain Works - The Facts Visually Explained By DK pdf | 30.95 MB | English | Isbn:1465489797 | Author: DK | PAge: 224 | Year: 2020 How the Brain Works - The Facts Visually Explained By DK pdf | 30.95 MB | English | Isbn:1465489797 | Author: DK | PAge: 224 | Year: 2020
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Oplysningerne må på ingen måde tages som erstatning for kompetent professional rådgivning eller behandling af uddannet og godkendt læge. Indholdet på Netdoktor.dk må ikke og kan ikke bruges som basis for at stille diagnoser eller fastlægge behandling. For yderligere information: Betingelser og Cookie-og Privatlivspolitik ...