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https://www.readbyqxmd.com/read/27924985/creating-bhb-imprinted-magnetic-nanoparticles-with-multiple-binding-sites
#1
Yanxia Li, Yiting Chen, Lu Huang, BenYong Lou, Guonan Chen
A kind of protein imprinted over magnetic Fe3O4@Au multifunctional nanoparticles (NPs) with multiple binding sites was synthesized and investigated. Magnetic Fe3O4@Au NPs as carrier materials were modified with 4-mercaptophenylboronic acid (MPBA) and mercaptopropionic acid (MPA) to introduce boronic acids and carboxyl groups. Using Bovine Hemoglobin (BHb) as a template, a polydopamine(PDA)-based molecular imprinted film was fabricated to produce a kind of magnetic molecularly imprinted nanoparticle (MMIP), possessing multiple binding sites with benzene-diol, amino groups, boronic acids and carboxyl groups...
December 7, 2016: Analyst
https://www.readbyqxmd.com/read/27924328/cycloreversion-of-the-co2-trimer-a-paradigmatic-pseudopericyclic-2-2-2-cycloaddition-reaction
#2
Roberto Villar López, Olalla Nieto Faza, Eduard Matito, Carlos Silva López
Very recently, the CO2 trimer has been experimentally synthesized, isolated and characterized. This process opens new ways for the withdrawal and storage of this greenhouse gas. The trimer is reported to be stable up to -40 °C, with a lifetime of about 40 min at this temperature. At these or under harsher thermal conditions it reverts to the three monomers. The mechanism of this reaction has been theoretically studied and the electronic character of the associated transition state has been analyzed from a variety of perspectives (energetic, magnetic, electron localization and delocalization functions) which indicate that it has paradigmatic pseudopericyclic character...
December 7, 2016: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/27924113/synthesis-and-antibacterial-activity-of-novel-lincomycin-derivatives-ii-exploring-7s-7-5-aryl-1-3-4-thiadiazol-2-yl-thio-7-deoxylincomycin-derivatives
#3
Ko Kumura, Yoshinari Wakiyama, Kazutaka Ueda, Eijiro Umemura, Takashi Watanabe, Megumi Kumura, Takuji Yoshida, Keiichi Ajito
The synthesis and antibacterial activity of (7S)-7-(5-aryl-1,3,4-thiadiazol-2-yl-thio)-7-deoxylincomycin derivatives are described. These derivatives were mainly prepared by the Mitsunobu reaction of 2,3,4-tris-O-(trimethylsilyl)lincomycin and the corresponding thiols. Exploring structure-activity relationships of the substituent at the 5 position of a thiadiazole ring revealed that compounds with the ortho substituted phenyl group showed improved antibacterial activities against Streptococcus pneumoniae and Streptococcus pyogenes with erm gene compared with the reported compound (1) that had an unsubstituted benzene ring...
December 7, 2016: Journal of Antibiotics
https://www.readbyqxmd.com/read/27923799/steinmaus-and-smith-respond-to-proximity-to-gasoline-stations-and-childhood-leukemia
#4
Craig Steinmaus, Martyn T Smith
Benzene is an established cause of adult leukemia, but its role in childhood leukemia is less clear. In a recent meta-analysis, we identified associations of childhood leukemia with occupational and household product benzene exposure and traffic-related pollution. Residential proximity to gasoline stations or automobile repair facilities may be another source of benzene, and in 3 studies assessing these sources, we identified a summary relative risk of 1.59 (95% confidence interval: 0.70, 3.62). Although not statistically significant, this summary relative risk was of a magnitude similar to that of our other positive findings...
December 6, 2016: American Journal of Epidemiology
https://www.readbyqxmd.com/read/27923798/residential-proximity-to-gasoline-stations-and-risk-of-childhood-leukemia
#5
REVIEW
Peter F Infante
Significant elevations in the risk of childhood leukemia have been associated with environmental exposure to gasoline; aromatic hydrocarbons from refinery pollution, petroleum waste sites, and mobile sources (automobile exhaust); paints, paint products, and thinners; and secondary cigarette smoke in the home. These higher risks have also been associated with parental exposure to benzene, gasoline, motor vehicle-related jobs, painting, and rubber solvents. These exposures and jobs have 1 common chemical exposure-benzene, a recognized cause of acute leukemia in adults-and raise the question of whether children represent a subpopulation in which a higher risk of leukemia is associated with very low level exposure to environmental benzene...
December 6, 2016: American Journal of Epidemiology
https://www.readbyqxmd.com/read/27920934/crystal-structure-of-3-2-hy-droxy-eth-yl-2-methyl-sulfanyl-6-nitro-3h-benzimidazol-1-ium-chloride-monohydrate
#6
Akoun Abou, Siomenan Coulibali, Rita Kakou-Yao, T Jérémie Zoueu, A Jules Tenon
In the cation of the title hydrated molecular salt, C10H12N3O3S(+)·Cl(-)·H2O, the benzimidazolium ring system is almost planar (r.m.s. deviation = 0.006 Å) and the nitro group is inclined at an angle of 4.86 (9)° to this plane. In the crystal, C-H⋯O hydrogen bonds form centrosymmetric R2(2)(20) dimers and these are further aggregated through N-H⋯O and O-H⋯Cl hydrogen bonds involving the water mol-ecules and chloride anions. Aromatic π-π stacking inter-actions are also found between two parallel benzene rings or the benzene and imidazolium rings, with centroid-centroid distances of 3...
September 1, 2016: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/27920930/crystal-structure-of-e-4-hy-droxy-n-3-meth-oxy-benzyl-idene-benzohydrazide
#7
Suchada Chantrapromma, Patcharawadee Prachumrat, Pumsak Ruanwas, Nawong Boonnak, Mohammad B Kassim
The title compound, C15H14N2O3, crystallizes with two independent mol-ecules (A and B) in the asymmetric unit that differ in the orientation of the 3-meth-oxy-phenyl group with respect to the methyl-idenebenzohydrazide unit. The dihedral angles between the two benzene rings are 24.02 (10) and 29.30 (9)° in mol-ecules A and B, respectively. In mol-ecule A, the meth-oxy group is twisted slightly relative to its bound benzene ring, with a Cmeth-yl-O-C-C torsion angle of 14.2 (3)°, whereas it is almost co-planar in mol-ecule B, where the corresponding angle is -2...
September 1, 2016: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/27920924/crystal-structure-of-6-p-tol-yl-benzo-b-naphtho-2-3-d-thio-phene-and-of-an-ortho-rhom-bic-polymorph-of-7-phenyl-anthra-2-3-b-benzo-d-thio-phene
#8
S Gopinath, K Sethusankar, Helen Stoeckli-Evans, Muhamad Rafiq, Arasambattu K Mohanakrishnan
The title compounds, C23H16S, (I), and C26H16S, (II), are benzo-thio-phene derivatives in which the benzo-thio-phene moiety is fused with a naphthalene ring system in (I), and with an anthracene ring system in (II). In (I), the mean plane of the benzo-thio-phene ring system makes a dihedral angle of 2.28 (6)° with the naphthalene ring system, and a dihedral angle of 1.28 (6)° with the anthracene ring system in (II), showing that the fused units are essentially planar. In (I), the 4-methyl-benzene ring substituent makes a dihedral angle of 71...
September 1, 2016: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/27920914/crystal-structure-of-4-4-eth-oxy-carbon-yl-piperazin-1-yl-benzoic-acid
#9
Md Serajul Haque Faizi, Musheer Ahmad, Irina A Golenya
The asymmetric unit of the title compound, C14H18N2O4, contains two independent mol-ecules (A and B) which have essentially the same conformation. The piperazine rings adopts chair conformations with the N atoms out of plane. The dihedral angles formed by the four approximately planar C atoms of the piperazine ring and the benzene ring is 30.8 (5)° in mol-ecule A and 30.6 (5)° in mol-ecule B. In the crystal, mol-ecules A and B are connected by a pair of O-H⋯O hydrogen bonds, forming a dimer with graph-set notation R2(2)(8)...
September 1, 2016: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/27920909/crystal-structure-of-methyl-e-4-2-8-hy-droxy-quinolin-2-yl-vin-yl-benzoate
#10
Yu-Xing Xu, Wei-Ji Hu, Guo-Liang Zhao
The title compound, C19H15NO3, was synthesized by a Perkin reaction of 2-methyl-8-hy-droxy-quinoline and 4-formyl-2-methyl-benzoate in acetic anhydride under a nitro-gen atmosphere. The mol-ecule has an E conformation about the C=C bond, and the quinoline ring system and the benzene ring are inclined to one another by 29.22 (7)°. There is an intra-molecular O-H⋯N hydrogen bond in the 8-hy-droxy-quinoline moiety. In the crystal, mol-ecules are linked by pairs of O-H⋯O hydrogen bonds, forming inversion dimers with an R2(2)(28) ring motif...
September 1, 2016: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/27918292/synthesis-and-structures-of-11-11-12-12-tetracyano-2-6-diiodo-9-10-anthraquinodimethane-and-its-2-1-cocrystals-with-anthracene-pyrene-and-tetrathiafulvalene
#11
Yi Ren, Semin Lee, Jeffery Bertke, Danielle L Gray, Jeffrey S Moore
Radical salts and charge-transfer complexes (CTCs) containing tetracyanoquinodimethane (TCNQ) display electrical conductivity, which has led to the development of many TCNQ derivatives with enhanced electron-accepting properties that are applicable toward organic electronics. To expand the family of TCNQ derivatives, we report the synthesis and structures of 11,11,12,12-tetracyano-2,6-diiodo-9,10-anthraquinodimethane (abbreviated as DITCAQ), C20H6I2N4, and its charge-transfer complexes with various electron donors, namely DITCAQ-anthracene (2/1), C20H6I2N4·0...
December 1, 2016: Acta Crystallographica. Section C, Structural Chemistry
https://www.readbyqxmd.com/read/27915383/a-covalent-antagonist-for-the-human-adenosine-a2a-receptor
#12
Xue Yang, Guo Dong, Thomas J M Michiels, Eelke B Lenselink, Laura Heitman, Julien Louvel, Ad P IJzerman
The structure of the human A2A adenosine receptor has been elucidated by X-ray crystallography with a high affinity non-xanthine antagonist, ZM241385, bound to it. This template molecule served as a starting point for the incorporation of reactive moieties that cause the ligand to covalently bind to the receptor. In particular, we incorporated a fluorosulfonyl moiety onto ZM241385, which yielded LUF7445 (4-((3-((7-amino-2-(furan-2-yl)-[1, 2, 4]triazolo[1,5-a][1, 3, 5]triazin-5-yl)amino)propyl)carbamoyl)benzene sulfonyl fluoride)...
December 3, 2016: Purinergic Signalling
https://www.readbyqxmd.com/read/27914290/the-interaction-of-surfactants-with-plastic-and-copper-plumbing-materials-during-decontamination
#13
Karen S Casteloes, Gamini P Mendis, Holly K Avins, John A Howarter, Andrew J Whelton
The study goal was to examine the effectiveness of surfactants to decontaminate plastic and copper potable water plumbing components. Several common potable water pipe and gasket plastics were examined as well as Alconox(®) detergent, Dawn(®) soap, and MAGIT-DG 100 surfactants. Results showed that the MAGIT-DG 100 solutions permeated all plastics within 3days, effectively compromising tensile strength (-82%), physical dimension (+43% volume, +45% weight), and oxidative resistance (-15%). A variety of MAGIT-DG 100 solution compounds permeated plastic samples, not just the declared major ingredient...
November 25, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/27914260/the-extent-of-fermentative-transformation-of-phenolic-compounds-in-the-bioanode-controls-exoelectrogenic-activity-in-a-microbial-electrolysis-cell
#14
Xiaofei Zeng, Maya A Collins, Abhijeet P Borole, Spyros G Pavlostathis
Phenolic compounds in hydrolysate/pyrolysate and wastewater streams produced during the pretreatment of lignocellulosic biomass for biofuel production present a significant challenge in downstream processes. Bioelectrochemical systems are increasingly recognized as an alternative technology to handle biomass-derived streams and to promote water reuse in biofuel production. Thus, a thorough understanding of the fate of phenolic compounds in bioanodes is urgently needed. The present study investigated the biotransformation of three structurally similar phenolic compounds (syringic acid, SA; vanillic acid, VA; 4-hydroxybenzoic acid, HBA), and their individual contribution to exoelectrogenesis in a microbial electrolysis cell (MEC) bioanode...
November 27, 2016: Water Research
https://www.readbyqxmd.com/read/27913419/benzene-degradation-by-variovorax-sp-within-a-coal-tar-contaminated-groundwater-microbial-community
#15
Kevin M Posman, Christopher M DeRito, Eugene L Madsen
: Investigations of environmental microbial communities are crucial for the discovery of populations capable of degrading hazardous compounds and may lead to improved bioremediation strategies. The goal of this study was to identify microorganisms responsible for aerobic benzene degradation in coal-tar contaminated groundwater. Benzene degradation was monitored in laboratory incubations of well waters using gas chromatography mass spectrometry (GC/MS). Stable isotope probing (SIP) experiments using (13)C-benzene allowed us to obtain (13)C-labled community DNA; from this, 16S rRNA clone libraries identified γ- and β-Proteobacteria as the active benzene metabolizing microbial populations...
December 2, 2016: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/27910969/the-intramolecular-h-bonding-effect-on-the-growth-and-stability-of-schiff-base-surface-covalent-organic-frameworks
#16
Yi-Ping Mo, Xuan-He Liu, Bing Sun, Hui-Juan Yan, Dong Wang, Li-Jun Wan
The introduction of intramolecular H-bonding by adding -OH functionalities adjacent to the Schiff base centers is considered to be a useful strategy to enhance the stability and crystallinity of bulk covalent organic frameworks (COFs). However, the influence of intramolecular H-bonding on the synthesis of surface COFs (SCOFs) have been barely explored. Herein, SCOFs based on the Schiff-base reaction between 1,3,5-tris(4-aminophenyl)benzene (TAPB) and terephthalaldehydes with symmetry or asymmetrically substituted hydroxyl functional groups are designed...
December 2, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27910405/high-dynamic-range-neutron-time-of-flight-detector-used-to-infer-the-d-t-n-4-he-and-d-d-n-3-he-reaction-yield-and-ion-temperature-on-omega
#17
C J Forrest, V Yu Glebov, V N Goncharov, J P Knauer, P B Radha, S P Regan, M H Romanofsky, T C Sangster, M J Shoup, C Stoeckl
Upgraded microchannel-plate-based photomultiplier tubes (MCP-PMT's) with increased stability to signal-shape linearity have been implemented on the 13.4-m neutron time-of-flight (nTOF) detector at the Omega Laser Facility. This diagnostic uses oxygenated xylene doped with diphenyloxazole C15H11NO + p-bis-(o-methylstyryl)-benzene (PPO + bis-MSB) wavelength shifting dyes and is coupled through four viewing ports to fast-gating MCP-PMT's, each with a different gain to allow one to measure the light output over a dynamic range of 1 × 10(6)...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27908762/bioactive-chemical-constituents-from-the-root-bark-of-morus-australis
#18
Yu-Ren Liao, Ping-Chung Kuo, Wei-Jern Tsai, Guan-Jhong Huang, Kuo-Hsiung Lee, Tian-Shung Wu
Two new pyranoflavonoids, morustralins A (1) and B (2), a new natural benzene derivative, one benzenoid (Z)-1-hydroxy-4-(2-nitroethenyl)benzene (3), and thirty known compounds were isolated and characterized from the root bark of Morus australis. The structures of the new compounds were established from spectroscopic and spectrometric analyses. Ten isolates (1-10) were examined for inhibitory effects on adenosine diphosphate (ADP)-, arachidonic acid (AA)-, and platelet-aggregating factor (PAF)-induced platelet aggregation...
November 17, 2016: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/27908134/understanding-the-microsolvation-of-radicals-infrared-spectroscopy-of-benzyl-radical-water-clusters
#19
Daniel Leicht, Matin Kaufmann, Raffael Schwan, Jan Schäfer, Gerhard Schwaab, Martina Havenith
The IR spectrum of benzyl radical:water clusters was recorded. Benzyl radicals were produced by vacuum flash pyrolysis and trapped in superfluid helium nanodroplets. The infrared spectrum of benzyl radical water aggregates in the range 2585-2820 cm(-1) was recorded by subsequent addition of deuterated water. A total of seven peaks are observed at 2766, 2750, 2656, 2638, 2633, 2598, and 2593 cm(-1). Based on pressure dependent measurements and comparison to accompanying ab initio calculations, five of these bands are assigned to distinct O-D stretch vibrations of benzyl:water clusters with one and two water molecules...
November 28, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/27905567/physical-characterization-and-antioxidant-activity-of-thymol-solubilized-tween-80-micelles
#20
Ling-Li Deng, Maierhaba Taxipalati, Fei Que, Hui Zhang
Attempts were made to solubilize thymol in Tween 80 micelle to study the solubilization mechanism of thymol and the effect of solubilization on its antioxidant activity. The maximum solubilized concentration of thymol in a 2.0% (w/v) Tween 80 micelle solution is 0.2 wt%. There was no significant difference in Z-average diameter between the empty micelles and thymol solubilized micelles. (1)H NMR spectra indicated that 3-H and 4-H on the benzene ring of thymol interacted with the ester group between the hydrophilic head group and the hydrophobic tail group of Tween 80 by Van der Waals' force...
December 1, 2016: Scientific Reports
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