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https://www.readbyqxmd.com/read/28646629/mechanisms-of-inhibitory-effects-of-polycyclic-aromatic-hydrocarbons-in-the-photosynthetic-primary-processes-in-pea-leaves-and-thylakoid-preparations
#1
V D Kreslavski, M Brestic, S K Zharmukhamedov, V Yu Luybimov, A V Lankin, A Jajoo, S I Allakhverdiev
Inhibitory effects of Polycyclic aromatic hydrocarbons on plants is studied in pea leaves in order to elucidate the mechanisms of action of polycyclic aromatic hydrocarbons (PAHs) such as naphthalene (Naph) and phenanthrene (Phen) on activity of photosystem 2 (PS-2). The changes in different Chl fluorescence parameters were calculated on the basis of Chl fluorescence induction curves. Hydrogen peroxide content was measured in leaf homogenates by luminol-dependent chemiluminescence method. We demonstrated that due to PAH treatment, the total energy dissipation (DI0 /ABS) and amount of QB -non-reducing complexes of PS-2 significantly increased...
June 24, 2017: Plant Biology
https://www.readbyqxmd.com/read/28645762/calculating-in-situ-degradation-rates-of-hydrocarbon-compounds-in-deep-waters-of-the-gulf-of-mexico
#2
Anne E Thessen, Elizabeth W North
Biodegradation is an important process for hydrocarbon weathering that influences its fate and transport, yet little is known about in situ biodegradation rates of specific hydrocarbon compounds in the deep ocean. Using data collected in the Gulf of Mexico below 700m during and after the Deepwater Horizon oil spill, we calculated first-order degradation rate constants for 49 hydrocarbons and inferred degradation rate constants for an additional 5 data-deficient hydrocarbons. Resulting calculated (not inferred) half-lives of the hydrocarbons ranged from 0...
June 20, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28643874/2-6-bis-diazaboryl-pyridine-a-superbasic-sterically-demanding-pyridine-ligand
#3
Tobias Böttcher, Daniel Himmel, Jan Schröder
Herein we present a convenient one-pot route to a sterically demanding superbasic pyridine. Functionalization of the 2,6-positions with the highly sigma-donating boryl-groups shifts the calculated gas phase basicity of the pyridine's nitrogen atom to 1012 kJ mol-1, which outperforms the 'proton sponge' 1,8-bis(dimethylamino)naphthalene (996 kJ mol-1). The diazaboryl groups are oriented orthogonal to the pyridine ring and do not block the N-position, resembling the geometry of commonly used N-heterocyclic carbenes...
June 23, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28641573/ancient-water-bottle-use-and-polycyclic-aromatic-hydrocarbon-pah-exposure-among-california-indians-a-prehistoric-health-risk-assessment
#4
Sabrina B Sholts, Kevin Smith, Cecilia Wallin, Trifa M Ahmed, Sebastian K T S Wärmländer
BACKGROUND: Polycyclic aromatic hydrocarbons (PAHs) are the main toxic compounds in natural bitumen, a fossil material used by modern and ancient societies around the world. The adverse health effects of PAHs on modern humans are well established, but their health impacts on past populations are unclear. It has previously been suggested that a prehistoric health decline among the native people living on the California Channel Islands may have been related to PAH exposure. Here, we assess the potential health risks of PAH exposure from the use and manufacture of bitumen-coated water bottles by ancient California Indian societies...
June 23, 2017: Environmental Health: a Global Access Science Source
https://www.readbyqxmd.com/read/28640627/chemical-modification-of-n-type-material-naphthalene-diimide-on-ito-for-efficient-and-stable-inverted-polymer-solar-cells
#5
Zhendong Li, Yanfeng Liu, Kai-Cheng Zhang, Zhao-Wei Wang, Peng Huang, Dahua Li, Yi Zhou, Bo Song
In order to provide orthogonal solvent processible surface modification and improve device stability of bulk-heterojunction polymer solar cells (PSCs), n-type semiconducting material naphthalene diimide (NDI) was chemically introduced on ITO surface as cathode interlayer (CIL) using 3-bromopropyltrimethoxysilane (BrTMS) as coupling agent. After modification, the work function of ITO can be decreased from 4.70 eV to 4.23 eV. The modified ITO cathode was applied in inverted PSCs based on PTB7-Th:PC71BM. With the CIL modification, a champion power conversion efficiency (PCE) of 5...
June 22, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28638963/attenuation-of-the-atmospheric-migration-ability-of-polychlorinated-naphthalenes-pcn-2-based-on-three-dimensional-qsar-models-with-full-factor-experimental-design
#6
Wenwen Gu, Ying Chen, Yu Li
Based on the experimental subcooled liquid vapor pressures (P L) of 17 polychlorinated naphthalene (PCN) congeners, one type of three-dimensional quantitative structure-activity relationship (3D-QSAR) models, comparative molecular similarity indices analysis (CoMSIA), was constructed with Sybyl software. Full factor experimental design was used to obtain the final regulation scheme for PCN, and then carry out modification of PCN-2 to significantly lower its P L. The contour maps of CoMSIA model showed that the migration ability of PCN decreases when the Cl atoms at the 2-, 3-, 4-, 5-, 6-, 7- and 8-positions of PCNs are replaced by electropositive groups...
June 21, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28638645/a-new-example-of-intra-molecular-c-h%C3%A2-ni-anagostic-inter-actions-synthesis-crystal-structure-and-hirshfeld-analysis-of-cis-bis-4-methyl-2-1-2-3-4-tetra-hydro-naphthalen-1-yl-idene-hydrazinecarbo-thio-amidato-%C3%AE%C2%BA-2-n-1-s-nickel-ii-di-methyl-formamide-monosolvate
#7
Adriano Bof de Oliveira, Johannes Beck, Sônia Elizabeth Brown S Mellone, Jörg Daniels
The reaction of Ni(II) acetate tetra-hydrate with 4-methyl-2-(1,2,3,4-tetra-hydro-naphthalen-1-yl-idene)hydrazinecarbo-thio-amide in a 2:1 molar ratio and recrystallization from di-methyl-formamide yielded the title compound, [Ni(C12H14N3S)2]·C3H7NO. The ligands act as monoanionic κ(2)N(1),S-donors, forming five-membered metallarings. The Ni(II) ion is fourfold coordinated in a distorted square-planar cis-configuration, which is rather uncommon for mono-thio-semicarbazone complexes. Intra-molecular H⋯Ni trans-inter-actions are observed [H⋯Ni distances are 2...
June 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28638638/crystal-structure-of-2-2-ethane-1-2-di-yl-bis-2-3-di-hydro-1h-naphtho-1-2-e-1-3-oxazine-a-prospective-raw-material-for-polybenzoxazines
#8
Augusto Rivera, Juan E Cepeda-Santamaría, Jaime Ríos-Motta, Michael Bolte
In the title compound, C26H24N2O2, the oxazine moiety is fused to a naphthalene ring system. The asymmetric unit consists of one half of the mol-ecule, which lies about an inversion centre. The C atoms of the ethyl-ene spacer group adopt an anti-periplanar arrangement. The oxazine ring adopts a half-chair conformation. In the crystal, supra-molecular chains running along the b axis are formed via short C-H⋯π contacts. The crystal studied was a non-merohedral twin with a fractional contribution of 0.168 (2) of the minor twin component...
June 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28638622/the-synergistic-use-of-plant-and-isolated-bacteria-to-clean-up-polycyclic-aromatic-hydrocarbons-from-contaminated-soil
#9
S Eskandary, A Tahmourespour, M Hoodaji, A Abdollahi
BACKGROUND: Biological methods of polycyclic aromatic hydrocarbons (PAH) contamination elimination typically involve the transformation of contaminants to non-toxic materials by microorganisms and plants and appear to be the most effective methods available. METHODS: In this study, Bacillus licheniformis and Bacillus mojavensis isolated from oil-contaminated soils were inoculated onto Festuca arundinacea seeds before planting in the pot and 3 weeks after planting by syringe injection into the rhizospheric zone in order to study the elimination of PAHs from Festuca's rhizosphere in the greenhouse...
2017: Journal of Environmental Health Science & Engineering
https://www.readbyqxmd.com/read/28637389/occurrence-of-polycyclic-aromatic-hydrocarbons-in-various-types-of-raw-oilseeds-from-different-regions-of-china
#10
Yun-Qi Wen, Yu-Lan Liu, Li-Li Xu, Wen-Xiu Yu, Yu-Xiang Ma
95 samples of 18 types of oilseeds used for edible oil production were collected from different origins of China. The occurrence of polycyclic aromatic hydrocarbons (PAHs) in these oilseeds was presented after the analysis by using a simplified GC-MS method. The results indicated that some of these oilseeds were not found of Indeno[1,2,3-cd]pyrene, Dibenz[a,h]anthracene and Benzo[ghi]perylene. Naphthalene and Phenanthrene had higher concentration than other individual PAH in the same sample. The range of BaP, PAH4 and PAH16 concentration in these 95 samples were 0...
June 21, 2017: Food Additives & Contaminants. Part B, Surveillance
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
#11
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/28636160/species-specific-metabolism-of-naphthalene-and-phenanthrene-in-three-species-of-marine-teleosts-exposed-to-deepwater-horizon-crude-oil
#12
Erin L Pulster, Kevan Main, Dana Wetzel, Steve Murawski
The two most abundant polycyclic aromatic hydrocarbons (PAHs) measured in the Deepwater Horizon (DWH) crude oil, naphthalene and phenanthrene and their associated homologs, have both been shown to be acutely toxic in fish. Although fish have a relatively high metabolic capacity for PAHs, hydroxylated PAH (OH-PAHs) derivatives formed during the initial metabolic response can negatively impact the health of fish. Species-specific metabolism of naphthalene and phenanthrene was evaluated in three marine teleosts, red drum (Scianops ocellatus), Florida pompano (Trachinotus carolinus) and southern flounder (Paralichthys lethostigma)...
June 21, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28635673/toxicity-of-naphthalene-and-benzene-on-tribollium-castaneum-herbst
#13
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/28628786/btex-and-naphthalene-degrading-bacterium-microbacterium-esteraromaticum-strain-sbs1-7-isolated-from-estuarine-sediment
#14
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/28627527/non-fullerene-acceptors-based-on-central-naphthalene-diimide-flanked-by-rhodanine-or-1-3-indanedione
#15
Doli Srivani, Akhil Gupta, Sidhanath V Bhosale, Avinash L Puyad, Wanchun Xiang, Jingliang Li, Richard A Evans, Sheshanath V Bhosale
Through the combination of central naphthalene diimide and terminal rhodanine or 1,3-indanedione functionalities, two new non-fullerene electron acceptors, coded as N3 and N4, were designed, synthesized and characterized. Both of the materials exhibited good solubility, thermal stability, and displayed energy levels matching those of the conventional and routinely used donor polymer poly(3-hexyl thiophene) (P3HT). A high power conversion efficiency of 4.76% was obtained in simple, solution-processable bulk-heterojunction devices (P3HT : N3 1 : 1...
June 19, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28621386/functionalization-of-graphene-oxide-with-9-aminoanthracene-for-the-adsorptive-removal-of-persistent-aromatic-pollutants-from-aqueous-solution
#16
Ali Balati, Mohammad Ghanbari, Karimi Behzad, M Mostafa Amini
A novel modified graphene oxide nanocomposite was fabricated via a facial procedure, aiming to removal of the aromatic pollutants from aqueous solution. The graphene oxide (GO) was functionalized with 9-aminoanthracene and produced graphene oxide-9-aminoanthracene (GO-9-AA). FTIR, XRD, TGA, TEM and Raman spectroscopy techniques were used for characterization of the adsorbents. Adsorption of naphthalene (NAP), acenaphthylene (ACN), and phenanthrene (PHN) as a model of polycyclic aromatic hydrocarbons (PAHs) was investigated by GO-9-AA...
June 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/28620626/tobacco-smoke-constituents-trigger-cytoplasmic-calcium-release
#17
M Flori Sassano, Arunava Ghosh, Robert Tarran
Cytosolic Ca(2+) is a universal second messenger that is involved in many processes throughout the body, including the regulation of cell growth/cell division, apoptosis, and the secretion of both ions, and macromolecules. Tobacco smoke exerts multiple effects on airway epithelia and we have previously shown that Kentucky reference cigarette smoke exposure elevated the second messenger Ca(2+), leading to dysfunctional ion secretion. In this study, we tested whether little cigar and commercial cigarette smoke exposure exerts similar effects on intracellular Ca(2+) levels...
June 1, 2017: Applied in Vitro Toxicology
https://www.readbyqxmd.com/read/28618358/identifying-structural-characteristics-of-humic-acid-to-static-and-dynamic-fluorescence-quenching-of-phenanthrene-9-phenanthrol-and-naphthalene
#18
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/28617575/external-influences-on-invertebrate-brain-histamine-and-related-compounds-via-an-automated-derivatization-method-for-capillary-electrophoresis
#19
Sandrine Parrot, Mónica Pavón Vergés, Marie-Jeanne Perrot-Minnot, Luc Denoroy
Histamine has been shown to modulate visual system and photic behavior in arthropods. However, few methods are available for the direct quantification of histamine and its precursor and metabolites in arthropod brain. In this work, a method for the separation of histamine, its precursor histidine and its metabolite N-methyl-histamine from brain extracts of a freshwater crustacean has been developed using capillary electrophoresis with laser-induced fluorescence detection. Molecules were tagged on their primary amine function with naphthalene-2,3-dicarboxaldehyde, but derivatized histamine and N-methyl-histamine exhibited poor stability in contrast to derivatized histidine...
June 15, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28616739/petrol-filling-workers-as-biomonitor-of-pah-exposure-and-functional-health-capacity-in-resource-limited-settings-of-city-rawalpindi-pakistan
#20
Audil Rashid, Shu Taov, Ikhtiar Uddin, Atif Kamal
This is the first study from Pakistan to report the exposure of petrol filling workers (n = 120) to naphthalene (Nap) and pyrene (Pyr) in relation to their functional capacities and health outcome. A group of non-exposed subjects (controls n = 46) was also recruited for comparison. The perceived health risk of the exposed workers was monitored using a questionnaire based on the self-reporting survey. The observed physical anomalies related to the health disorder included the acidity after meals, eye redness, appetite loss, skin lesions, and dryness of oral cavity, while those related to neurasthenic symptoms included the body aches, energy loss, twitching, fatigue, sleeplessness, fainting, and irritability...
June 14, 2017: Environmental Science and Pollution Research International
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