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https://www.readbyqxmd.com/read/28636336/a-mg-cp-with-in-situ-encapsulated-photochromic-guest-as-sensitive-fluorescence-sensor-for-fe-3-cr-3-ions-and-nitro-explosives
#1
Zhao-Feng Wu, Liao-Kuo Gong, Xiao-Ying Huang
Here we report a fluorescent magnesium coordination polymer (Mg-CP), namely, [CH3-dpb]2[Mg3(1,4-NDC)4(μ-H2O)2(CH3OH)(H2O)]·1.5H2O (1, 1,4-H2NDC = 1,4-naphthalene dicarboxylic acid, dpb = 1,4-bis(pyrid-4-yl)benzene). Compound 1 possesses a three-dimensional (3D) host-guest structure constructed by the 1,4-NDC linkers bridging the linear trinuclear secondary building units of [Mg3(COO)8(μ-H2O)2]. The dpb molecules were in situ reacted with CH3OH resulting in photochromic cations of [CH3-dpb](+) that acted as guests located in the channels parallel to the b-axis...
June 21, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28636041/fluorescence-properties-of-aurone-derivatives-an-experimental-and-theoretical-study-with-some-preliminary-biological-applications
#2
Christian Espinosa-Bustos, Diego Cortés-Arriagada, Marco A Soto-Arriaza, José Robinson-Duggon, Nancy Pizarro, Alan R Cabrera, Denis Fuentealba, Cristian O Salas
In this paper, we explored the fluorescence properties of eight aurone derivatives bearing methoxy groups and bromine atoms as substituents in the benzene rings. All derivatives showed strong solvatochromic absorption and emission properties in solvents of different polarities. Some of them showed high fluorescence quantum yields, which make them potential compounds for sensing applications. The position of the methoxy groups in the benzofuranone moiety and the presence of bromine atoms in the benzene ring had a strong influence on the fluorescence behaviour of the aurones...
June 21, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28635673/toxicity-of-naphthalene-and-benzene-on-tribollium-castaneum-herbst
#3
Nerlis Pajaro-Castro, Karina Caballero-Gallardo, Jesus Olivero-Verbel
Naphthalene and benzene are widely-used volatile organic compounds. The aim of this research was to examine the toxicological effects of naphthalene and benzene against Tribolium castaneum as an animal model. Adult insects were exposed to these aromatic compounds to assess mortality after 4-48 h of exposure. The lethal concentration 50 (LC50) for naphthalene, naphthalin, and benzene were 63.6 µL/L, 20.0 µL/L, and 115.9 µL/L in air, respectively. Real-time polymerase chain reaction (PCR) analysis revealed expression changes in genes related to oxidative stress and metabolism [Glutathione S-Transferase (Gst), and Cytochrome P450 6BQ8 (Cyp6bq8)]; reproduction and metamorphosis [Hormone receptor in 39-like protein (Hr39), Ecdysone receptor: (Ecr), and Chitin synthase 2 (Chs2)]; and neurotransmission [Histamine-gated chloride channel 2 (Hiscl2)] in insects exposed for 4 h to 70...
June 21, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28632421/novel-urushiol-derivatives-as-hdac8-inhibitors-rational-design-virtual-screening-molecular-docking-and-molecular-dynamics-studies
#4
Hao Zhou, Chengzhang Wang, Tao Deng, Ran Tao, Wenjun Li
Three series of novel urushiol derivatives were designed by introducing a hydroxamic acid moiety into the tail of an alkyl side chain and substituents with differing electronic properties or steric bulk onto the benzene ring and alkyl side chain. The compounds' binding affinity towards HDAC8 was screened by Glide docking. The highest-scoring compounds were processed further with molecular docking, MD simulations and binding free energy studies to analyze the binding modes and mechanisms. Ten compounds had Glide scores of -8...
June 20, 2017: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/28632383/taking-advantage-of-disorder-small-molecule-organic-glasses-for-radiation-detection-and-particle-discrimination
#5
Joseph S Carlson, Peter Marleau, Ryan A Zarkesh, Patrick L Feng
A series of fluorescent silyl-fluorene molecules were synthesized and studied with respect to their photophysical properties and response toward ionizing neutron and gamma-ray radiation. Optically transparent and stable organic glasses were prepared from these materials using a bulk melt-casting procedure. The prepared organic glass monoliths provided fluorescence quantum yields and radiation detection properties exceeding the highest-performing benchmark materials such as solution-grown trans-stilbene crystals...
June 20, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28632271/copper-promoted-direct-c-h-alkoxylation-of-s-s-functionalized-internal-olefins-with-alcohols
#6
Zhuqing Liu, Fei Huang, Jiang Lou, Quannan Wang, Zhengkun Yu
Copper-promoted direct C-H alkoxylation of S,S-functionalized internal olefins, that is, α-oxo ketene dithioacetals, was efficiently achieved with alcohols as the alkoxylating agents, (diacetoxyiodo)benzene (PhI(OAc)2) as the oxidant, and benzoquinone (BQ) as the co-oxidant. The alkoxylated olefins were thus constructed and applied for the synthesis of alkoxylated N-heterocycles. The polarization of the olefinic carbon-carbon double bond by the electron-donating dialkylthio and electron-withdrawing α-oxo functionalities plays a crucial role in making such C-H alkoxylation reactions to occur under mild conditions...
June 20, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28628786/btex-and-naphthalene-degrading-bacterium-microbacterium-esteraromaticum-strain-sbs1-7-isolated-from-estuarine-sediment
#7
Akanit Wongbunmak, Sansanee Khiawjan, Manop Suphantharika, Thunyarat Pongtharangkul
In this study, a non-pathogenic, BTEX-degrading Microbacterium esteraromaticum SBS1-7 was isolated from estuarine sediment in Thailand via an enrichment technique. M. esteraromaticum SBS1-7 was able to degrade all six BTEX components, in both liquid medium and soil slurry system, when BTEX was supplied as an individual component or a mixture. It exhibited a high level of tolerance towards a wide range of hydrocarbons and also utilized alkanes and naphthalene. Detection of metabolites produced during BTEX and naphthalene degradation revealed highly extensive biodegradation pathways used by M...
June 9, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28628229/troxerutin-with-copper-generates-oxidative-stress-in-cancer-cells-its-possible-chemotherapeutic-mechanism-against-hepatocellular-carcinoma
#8
A Subastri, A Suyavaran, Preedia Babu E, Nithyananthan S, R Bharathidasan, C Thirunavukkarasu
Troxerutin (TXER) a rutin derivative is known for its anticancer effect against hepatocellular carcinoma (HCC). As part of large study, recently we have shown TXER interact with genetic material and its anti-mutagenic property. In the present study we have explored its possible mode of action in HCC. Since TXER alone did not show significant anticancer effect on Huh-7 cells, in vitro biochemical assays were performed for determining anticancer efficacy of TXER + metal complex using transition metals such as Cu, Zn & Fe...
June 19, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28627162/fabrication-and-characterization-of-surfaces-modified-with-carboxymethylthio-ligands-for-chelate-assisted-trapping-of-copper
#9
John Onyango Adongo, Tilmann Neubert, Guoguang Sun, Silvia Janietz, Iver Lauermann, Klaus Rademann, Joerg Rappich
Metal ion chelating property was conferred onto silicon (Si) and gold (Au) surfaces by direct electrografting of 4-[(carboxymethyl)thio]benzenediazonium cation (4-CMTBD). Infrared spectroscopic ellipsometry (IRSE) showed presence of characteristic phenyl and carbonyl vibrational bands on the functionalized surfaces as a proof of existence of surface bound organic units of 4-[(carboxymethyl)thio]benzene (4-CMTB). The loss of diazonium group (N≡N+) upon electrografting of 4-CMTBD was investigated using IR spectroscopy...
June 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28626132/performance-of-palm-based-c16-18-methyl-ester-sulphonate-mes-in-liquid-detergent-formulation
#10
Zulina Abd Maurad, Zainab Idris, Razmah Ghazali
Liquid detergents are more convenient than powdered detergents as they dissolve readily in water, generate less dust and dosing is easy. However, the stability of liquid detergents is an issue of concern. Therefore, the objective of this research is to study the formulation requirement to produce heavy-duty liquid detergents based on palm-based methyl esters sulphonate (MES) with desirable properties and performance. MES is produced from renewable and sustainable feedstock suitable to replace the conventional fossil-based surfactant, linear alkyl benzene sulphonates (LAS)...
June 13, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28624942/toxicity-of-56-substances-to-trees
#11
Lauge Peter Westergaard Clausen, Stefan Trapp
Toxicity data of substances to higher plants is needed for the purpose of risk assessment, site evaluation, phytoremediation, and plant protection. However, the results from the most common phytotoxicity tests, like the OECD algae and Lemna test, are not necessarily valid for higher terrestrial plants. The willow tree toxicity test uses inhibition of transpiration (aside of growth and water use efficiency) of willow cuttings grown in spiked solutions or soils as end point to quantify toxicity. This overview presents results from 60 studies including 24 new unpublished experiments for 56 different chemicals or substrates...
June 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28623787/simultaneous-determination-of-btex-and-their-metabolites-using-solid-phase-microextraction-followed-by-hplc-or-gc-ms-an-application-in-teeth-as-environmental-biomarkers
#12
Johannes L González, Albert Pell, Montserrat López-Mesas, Manuel Valiente
Applications of benzene, toluene, ethylbenzene, and o-, m-, and p-xylenes (BTEX) release them into the environment exposing living organism. These endocrine disruptors are toxic, highly volatile and easily absorbed by the lungs and can cause adverse consequences for the human health as neurological diseases and cancer. A method for the analysis of BTEX and its metabolites (phenols and aromatic acids) in teeth is presented. The method consists in a one-step simple extraction procedure from spiked tooth using NaOH solution followed by SPME-HPLC or HS-SPME-GC/MS determination...
June 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28623008/yucca-schidigera-can-promote-rabbit-growth-fecundity-affect-the-release-of-hormones-in-vivo-and-in-vitro-induce-pathological-changes-in-liver-and-reduce-ovarian-resistance-to-benzene
#13
Martina Földešiová, Andrej Baláži, Ľubica Chrastinová, Juraj Pivko, Jan Kotwica, Abdel Halim Harrath, Peter Chrenek, Alexander V Sirotkin
This study evaluated the effect of Yucca schidigera (YS) extract on the physiological, reproductive, and endocrine indexes of New Zealand White rabbit does. Six-week-old rabbit does were fed a standard diet (control group) or a diet enriched with 5 or 20g of Y powder extract per 100-kg feed mixture for 350days. The does were artificially inseminated after induction of superovulation. Weight gain; conception and kindling rate; viability of pups and mothers; histopathological state of liver and muscle; plasma levels of progesterone (P4), oxytocin (OT), and prostaglandin F (PGF); and the release of P4, insulin-like growth factor I (IGF-I), OT, and PGF by isolated ovarian fragments and their response to the addition of benzene were analyzed...
June 10, 2017: Animal Reproduction Science
https://www.readbyqxmd.com/read/28621536/substituent-effect-on-the-sigma-and-pi-electron-structure-of-the-nitro-group-and-the-ring-in-meta-and-para-substituted-nitrobenzenes
#14
Halina Szatylowicz, Anna Jezuita, Krzysztof Ejsmont, Tadeusz Marek Krygowski
An application of quantum chemical modeling allowed to investigate a substituent effect on a sigma and pi electron structure of a ring and the nitro group in a series of meta- and para-X-substituted nitrobenzene derivatives (X = NMe2, NHMe, NH2, OH, OMe, Me, H, F, Cl, CF3, CN, CHO, COMe, CONH2, COOH, NO2, and NO). The obtained pEDA and sEDA parameters (the pi and sigma electron structure characteristics of a given planar fragment of the system obtained by the summation of pi and sigma orbital occupancies, respectively) of the NO2 group and the benzene ring allowed to reveal impact of the substituents on their mutual relations as well as to analyze them from view-point of substituent characteristics...
June 16, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28620396/identification-of-a-potential-isr-determinant-from-pseudomonas-aeruginosa-pm12-against-fusarium-wilt-in-tomato
#15
Sabin Fatima, Tehmina Anjum
Biocontrol of plant diseases through induction of systemic resistance is an environmental friendly substitute to chemicals in crop protection measures. Different biotic and abiotic elicitors can trigger the plant for induced resistance. Present study was designed to explore the potential of Pseudomonas aeruginosa PM12 in inducing systemic resistance in tomato against Fusarium wilt. Initially the bioactive compound, responsible for ISR, was separated and identified from extracellular filtrate of P. aeruginosa PM12...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28618358/identifying-structural-characteristics-of-humic-acid-to-static-and-dynamic-fluorescence-quenching-of-phenanthrene-9-phenanthrol-and-naphthalene
#16
Lin Wang, Hao Li, Yu Yang, Di Zhang, Min Wu, Bo Pan, Baoshan Xing
Fluorescence quenching is a sensitive and fast method to quantify the interactions between a fluorescent organic contaminant and a quencher, such as dissolved organic matter (DOM). Dynamic fluorescence quenching is resulted from molecular collision, not the real binding, and thus it complicates the binding data interpretation. On the other hand, static fluorescence quenching occurs for fluorescent contaminants of ground states, which decreases the concentration of freely dissolved contaminants. However, how a particular structure in DOM contributes to the static and dynamic fluorescence quenching of a fluorescent contaminant is still unclear, which has greatly hindered the application of fluorescence quenching technique...
June 12, 2017: Water Research
https://www.readbyqxmd.com/read/28617602/rewriting-electron-transfer-kinetics-at-pyrolytic-carbon-electrodes-decorated-with-nanometric-ruthenium-oxide
#17
Joseph F Parker, Gabrielle E Kamm, Ashlee D McGovern, Paul A DeSario, Debra R Rolison, Justin C Lytle, Jeffrey W Long
Platinum is state-of-the-art for fast electron transfer whereas carbon electrodes, which have semimetal electronic character, typically exhibit slow electron-transfer kinetics. But when we turn to practical electrochemical devices, we turn to carbon. To move energy devices and electro(bio)analytical measurements to a new performance curve requires improved electron-transfer rates at carbon. We approach this challenge with electroless deposition of disordered, nanoscopic anhydrous ruthenium oxide at pyrolytic carbon prepared by thermal decomposition of benzene (RuOx@CVD-C)...
June 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28613905/unexpected-effects-of-activator-molecules-polarity-on-the-electroreological-activity-of-titanium-dioxide-nanopowders
#18
Alexander Viktorovich Agafonov, Olga I Davydova, Anton S Krayev, Olga S Ivanova, Olga L Evdokimova, Tatiana V Gerasimova, Alexander E Baranchikov, Vladimir V Kozik, Vladimir K Ivanov
Titanium dioxide nanoparticles, obtained using the sol-gel method and modified with organic solvents such as acetone, acetonitrile, benzene, diethyl ether, dimethylsulfoxide, toluene and chloroform, were used as the filler of polydimethylsiloxane-based electrorheological fluids. The effect of electric field strength on the shear stress and yield stress of electrorheological fluids was investigated, as well as the spectra of their dielectric relaxation in the frequency range from 25 to 106 Hz. Modification of titanium dioxide by polar molecules was found to enhance the electrorheological effect, as compared with unmodified TiO2, in accordance with the widely accepted concept of polar molecule dominated electrorheological effect (PM-ER)...
June 14, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28613870/systematic-investigation-of-%C3%AF-%C3%AF-interactions-in-near-edge-x-ray-fine-structure-nexafs-spectroscopy-of-paracyclophanes
#19
Sahan D Perera, Stephen G Urquhart
NEXAFS spectroscopy has potential for study of packing and order in organic materials but only if intermolecular effects are understood. This work studies how π-π interactions between adjacent unsaturated groups affect their NEXAFS spectra, with a broader goal of building a general understanding of the role of intermolecular effects in NEXAFS spectroscopy. These effects are examined using paracyclophane (PCP) molecules, in which the benzene-benzene separation distance is controlled by varying the length of the alkyl groups separating the benzene rings...
June 21, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28613336/visible-light-mediated-c3-azolylation-of-imidazo-1-2-a-pyridines-with-2-bromoazoles
#20
Qing Chang, Zhongjie Wu, Lu Yu, Ping Liu, Peipei Sun
The C3-azolylation of imidazo[1,2-a]pyridines was developed via a visible light-mediated reaction of imidazopyridines with 2-bromoazoles catalyzed by Ir(ppy)2(dtbbpy)PF6 under mild conditions. For the imidazo[1,2-a]pyridines with various substituents on benzene or the pyridine ring and a variety of azoles, the reaction proceeded smoothly to give 3-(azol-2-yl)imidazo[1,2-a]pyridines in moderate to good yields.
June 14, 2017: Organic & Biomolecular Chemistry
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