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Klamerus-Iwan Anna, Gloor Emanuel, Sadowska-Rociek Anna, Ewa Błońska, Jarosław Lasota, Sylwia Łagan
The canopy water storage capacity (S) is an important parameter for the hydrological cycle in forests. One factor which influences the S is leaf texture, which in turn is thought to be affected by the contents of polycyclic aromatic hydrocarbons (PAHs). In order to improve our understanding of S we simulated rainfall and measured the S of coniferous species growing under various conditions. The contents of 18 PAHs were measured in the needles. The species chosen were: Scots pine (Pinus sylvestris L), Norway spruce (Picea abies (L...
August 7, 2018: Environmental Pollution
P S Khillare, V K Sattawan, D S Jyethi
One of the methods of sludge disposal in cities is its use as an amendment in adjoining agricultural soil. Contaminants in sludge can, however, nullify the benefits. Polycyclic aromatic hydrocarbons (PAHs) are a class of persistent organic pollutants, if present, can pose health risks by virtue of their carcinogenic potential and persistence in soil. The present study deals with profile analysis of PAHs in digested sewage sludge of a megacity, Delhi. Mean concentration of the sum of sixteen PAHs in the sludge from five sewage treatment plants (STPs) was 20...
August 17, 2018: Environmental Technology
Yongye Zhao, Alan L Connor, Thomas A Sobiech, Bing Gong
The effects of oligomer length, solvent, and temperature on the self-association of stably folded short aromatic oligoamide are probed. With large flat surfaces, these aromatic oligoamides undergo stacking interaction with strength that increases nonlinearly with oligomer lengths. Opposite to typical aromatic stacking, the stacking of these molecules is enhanced in solvents of low polarity, but it is greatly weakened in polar solvents, especially those with hydrogen bond donors, and it is very sensitive to changes in temperature...
August 17, 2018: Organic Letters
Michele Iannone, Francesco Botrè, Nicoletta Cardillo, Xavier de la Torre
Anectodical information suggests that flavonoids may be widely used among athletes for their multiple biochemical and pharmacological effects. We have evaluated in vitro the effects of two synthetic isoflavones, methoxyisoflavone and ipriflavone, on the catalytic activity of human aromatase (CYP19), the enzyme catalyzing the conversion of androgens (i.e. testosterone or androstenedione) to estrogens (i.e. estradiol and estrone). The potential inhibitory effect was evaluated by measuring the rate of aromatization of testosterone, monitored by GC-MS, both in the presence and in the absence of methoxyisoflavone or ipriflavone, comparing their effects with those of synthetic aromatase inhibitors (formestane, anastrozole and aminoglutethimide) presently included in the list of prohibited substances and methods, and of natural flavonoids (chrysin, quercetin and daidzein), that are known inhibitors of CYP19...
August 17, 2018: Drug Testing and Analysis
Yi Huang, Xiaodan Chong, Cuibo Liu, Yu Liang, Bin Zhang
For electrocatalytic water splitting, the sluggish anodic oxygen evolution reaction (OER) has extremely restricted the cathodic hydrogen evolution reaction (HER). Therefore, developing an alternative anodic reaction with accelerating kinetics to produce value-added chemicals, especially coupled with HER, is of great importance. Here, a thermodynamically more favourable primary amine (-CH2-NH2) electrooxidation catalyzed by NiSe nanorod arrays in water is reported to replace OER for enhancing HER. The increased H2 production can be obtained at cathode, meanwhile, a variety of aromatic and aliphatic primary amines are selectively electrooxidized to nitriles with good yields at anode...
August 17, 2018: Angewandte Chemie
Karthick Sothivelr, Florian Bender, Fabien Josse, Edwin E Yaz, Antonio J Ricco
A new approach is reported to detect and quantify the members of a group of small-aromatic-molecule target analytes: benzene, toluene, ethylbenzene and xylenes (BTEX), dissolved in water, in the presence of interferents, using only the data collected from a single polymer-coated SH-SAW (shear horizontal surface acoustic wave) device and a two-stage adaptive estimation scheme. This technique is comprised of exponentially-weighted recursive least-squares estimation (EW-RLSE) and a bank of Kalman filters (BKFs) and does not require any prior knowledge of the initial concentration range of the target analytes...
August 17, 2018: ACS Sensors
Reem Al-Wabli, Mohammad Fouad, Radwan El-Haggar
The promising activity of coumarin derivatives as anti-inflammatory agents has motivated us to synthesize a new series of coumarin derivatives aiming to improve the anti-inflammatory activity and/or bioavailability. In the present work, the reaction between compound III and different aromatic acyl chloride had resulted in a series of ester derivatives 1-9. All synthesized new compounds 1-9 along with compound III as a parent compound and Celecoxib as a reference, were assessed for their anti-inflammatory activity both in-vivo and in-vitro using the formalin-induced hind paw edema method and inhibition of albumin denaturation and red blood cells (RBCs) membrane stabilization, respectively...
August 16, 2018: Anti-inflammatory & Anti-allergy Agents in Medicinal Chemistry
Jie Tang, Bo Liu, Ting-Ting Chen, Kai Yao, Lin Zeng, Chao-Yi Zeng, Qing Zhang
A novel beta-cypermethrin (Beta-CP)-degrading strain isolated from activated sludge was identified as Brevibacillus parabrevis BCP-09 based on its morphological and physio-biochemical characteristics, and 16S rRNA gene analysis. Strain BCP-09 could effectively degrade Beta-CP at pH 5.0-9.0, 20-40 °C, and 10-500 mg L-1 Beta-CP. Under optimal conditions (pH 7.41, 38.9 °C, 30.9 mg L-1 Beta-CP), 75.87% Beta-CP was degraded within 3 days. Beta-CP degradation (half-life, 33.45 h) and strain BCP-09 growth were respectively described using first-order-kinetic and logistic-kinetic models...
August 16, 2018: Biodegradation
Ling-Yan Shao, Zhi Xu, Cun-Ying Wang, Xiao-Pan Fu, Miao-Miao Chen, Hong-Wei Liu, Ya-Fei Ji
An efficient palladium-catalyzed ortho-aroylation of O-arylmethyl and aryl-substituted acetoxime ethers has been developed; this method has high mono-site selectivity and does not require exogenous ligands. Under the direction of a simple exo-acetoxime auxiliary, a broad scope of masked arylmethyl alcohols and phenols as well as various aromatic aldehydes are compatible with this transformation, which probably follows a mechanistic pathway involving a six- or five-membered exo-cyclopalladated intermediate. The strategy can be expediently adopted to prepare synthetically valuable 1H-benzo[d][1,2]oxazines and benzo[d]isoxazoles...
August 17, 2018: Organic & Biomolecular Chemistry
Hussain Al-Thaiban, Nada Al-Tamimi, Murad Helaleh
A simple and fast method for the determination of PAHs in smoked meat samples was described. The QuEChERS (Z-Sep) procedure was used for sample preparation. Gas chromatograph-mass spectrometer with electron ionization (EI) was used to separate and detect the PAHs. All 16 common PAHs were analyzed successfully. Matrix-matched calibration was applied. Spiked samples were performed at 1 ng/g ( n =10) and 10 ng/g ( n =10) for two days. Overall recoveries of PAHs were within 74 to 117%, with RSDs within 1.15 to 37...
2018: Journal of Analytical Methods in Chemistry
Pinar Sen, Sevgi Kansiz, Irina A Golenya, Necmi Dege
The title compound, C26 H36 N2 O2 , crystallizes in the phenol-imine form. In the mol-ecule, there are intra-molecular O-H⋯N hydrogen bonds forming S (6) ring motifs, and the two aromatic rings are inclined to each other by 37.9 (7)°. In the crystal, mol-ecules are linked by pairs of weak C-H⋯O hydrogen bonds, forming inversion dimers. Hirshfeld surface analysis and two-dimensional fingerprint plots indicate that the most important contributions to the crystal packing are from H⋯H (77.5%), H⋯C/C⋯H (16%), H⋯O/O⋯H (3...
August 1, 2018: Acta Crystallographica. Section E, Crystallographic Communications
T N Sanjeeva Murthy, S Naveen, C S Chidan Kumar, M K Veeraiah, Ching Kheng Quah, B P Siddaraju, Ismail Warad
In the title chalcone-thio-phene derivative, C13 H6 Cl3 FOS, the aromatic rings are inclined to one another by 12.9 (2)°, and the thio-phene ring is affected by π-conjugation. In the crystal, mol-ecules are linked by C-H⋯F hydrogen bonds, forming an R 2 2 (8) ring motif. A Hirshfeld surface analysis was conducted to verify the contribution of the different inter-molecular inter-actions. The shape-index surface clearly shows that the two sides of the mol-ecules are involved in the same contacts with neighbouring mol-ecules and the curvedness plots show flat surface patches characteristic of planar stacking...
August 1, 2018: Acta Crystallographica. Section E, Crystallographic Communications
Tsugiko Takase, Ryosuke Abe, Dai Oyama
The mol-ecular and crystal structures of a CO2 2- -bridged dinuclear ruthenium complex is reported, namely, μ-carbonito-κ2 C : O -bis-[bis(2,2'-bi-pyridine-κ2 N , N ')carbon-ylruthenium(II)] bis-(hexa-fluorido-phosphate)-aceto-nitrile-diethyl ether (1/1/0.5), [Ru2 (CO)2 (C10 H8 N2 )4 ( μ:κ 2 - C:O -CO2 )](PF6 )2 ·CH3 CN·0.5C4 H10 O. The complex cation in the title compound consists of two {Ru(CO)(bpy)2 }2+ units (bpy = 2,2'-bi-pyridine) singly bridged by a μ:κ2 - C : O carbonite anion, resulting in an unsymmetrical dinuclear structure...
August 1, 2018: Acta Crystallographica. Section E, Crystallographic Communications
S N Sheshadri, Zeliha Atioğlu, Mehmet Akkurt, M K Veeraiah, Ching Kheng Quah, C S Chidan Kumar, B P Siddaraju
In the mol-ecule of the title compound, C17 H14 BrFO3 , the aromatic rings are tilted with respect to the enone bridge by 13.63 (14) and 4.27 (15)°, and form a dihedral angle 17.91 (17)°. In the crystal, centrosymmetrically related mol-ecules are linked by pairs of C-H⋯O hydrogen bonds into dimeric units, forming rings of R 2 2 (14) graph-set motif. The dimers are further connected by weak C-H⋯O hydrogen inter-actions, forming layers parallel to (10). Hirshfeld surface analysis shows that van der Waals inter-actions constitute the major contribution to the inter-molecular inter-actions, with H⋯H contacts accounting for 29...
August 1, 2018: Acta Crystallographica. Section E, Crystallographic Communications
Caterina Ledda, Carla Loreto, Massimo Bracci, Claudia Lombardo, Gaetano Romano, Diana Cinà, Nicola Mucci, Sergio Castorina, Venerando Rapisarda
Background: Emissions from vehicles are composed of heterogeneous mixtures of hazardous substances; several pollutants such as Polycyclic Aromatic Hydrocarbons (PAHs) are amongst the most dangerous substances detected in urban monitoring. A cohort of traffic policemen usually occupationally exposed to PAHs present in the urban environment were examined in order to assess the mutagenicity and DNA capacity repair. Methods: Seventy-two urban traffic policemen working in Catania's metropolitan area were enrolled in the study...
2018: Journal of Occupational Medicine and Toxicology
Di Zhou, Jing Zeng, Qifeng Fu, Die Gao, Kailian Zhang, Xiujun Ren, Kai Zhou, Zhining Xia, Lujun Wang
In this work, a novel dendritic stationary phase was synthesized by the repeated grafting of 1,4-butanediol diglycidyl ether (BDDE) and dopamine (DA) on the surface of silica for performing mixed-mode high-performance liquid chromatography (MHPLC). Elemental analysis (EA), thermogravimetric analysis (TGA) and Fourier transform infrared spectrometry (FT-IR) showed the successful preparation of the dendritic stationary phase. The prepared stationary phase showed the retention mechanisms of reversed-phase liquid chromatography (RPLC), hydrophilic interaction chromatography (HILIC) and ion-exchange chromatography (IEC) under different mobile phase conditions...
August 8, 2018: Journal of Chromatography. A
Hiba Ben Othman, Élodie Lanouguère, Patrice Got, Asma Sakka Hlaili, Christophe Leboulanger
The toxicity of polycyclic aromatic hydrocarbons (PAHs) mixtures was evaluated on natural phytoplankton communities sampled from lagoons of Bizerte (South-western Mediterranean Sea) and Thau (North-western Mediterranean Sea). PAHs induced short-term dose and ecosystem-dependant decreases in photosynthetic potential. Chlorophyll a was negatively affected by increasing PAHs concentrations, together with dramatic changes in phytoplankton community composition. Size classes were strongly affected in the Bizerte compare to the Thau lagoon, with a decrease in nano- and microphytoplankton densities compare to picophytoplankton...
October 2018: Chemosphere
Aiguo Wang, Hua Song
Maximizing the production of aromatic hydrocarbons from lignin conversion by coupling methane activation without solvent was investigated over Zn-Ga modified zeolite catalyst. The co-loading of Zn and Ga greatly improves lignin conversion, arene yield along with BTEX (i.e., benzene, toluene, ethylbenzene, and xylene) selectivity, which gives 37.4 wt% yield of aromatic hydrocarbons with 62.2 wt% selectivity towards BTEX at 400 °C and 3.0 MPa. Methane presence has a negligible impact on lignin conversion, but improves arene yield and BTEX selectivity...
August 11, 2018: Bioresource Technology
Benjamin Hindersmann, Christine Achten
Urban soils in mining and industrial regions like the Ruhr Area are characterized by admixtures of anthropogenic substrates, e. g. tailings, coals, ashes, debris or scoria. These soils often show elevated concentrations of polycyclic aromatic hydrocarbons (PAHs) which are commonly attributed to non-point pyrogenic carbon sources like soot and particulate matter. An emission source of PAHs into urban soils in these regions, that surprisingly is still largely neglected, are the millions of tons of tailings from underground coal mining that have been used as material for road construction, terrain leveling, river channeling and support of embankments...
August 7, 2018: Environmental Pollution
Isabella Antony Lobo, Patrick A Robertson, Luigi Villani, David J D Wilson, Evan G Robertson
Evidence and understanding of sulfur-centred hydrogen bonding, especially where the donor is a thiol, lags far behind that for conventional OH interactions. To help address this deficiency, conformer specific IR spectra of 2-phenylethanethiol (PET) and associated 1:1 solvent complexes have been measured in SH, OH and CH stretch regions using Resonant-Two-Photon-Ionisation (R2PI) and IR-UV ion dip spectroscopic techniques. The aromatic and aliphatic CH stretch regions show signature differences between anti and gauche conformers...
August 16, 2018: Journal of Physical Chemistry. A
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