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https://www.readbyqxmd.com/read/28817150/beryllium-based-fluorenes-as-efficient-anion-sponges
#1
M Merced Montero-Campillo, Inés Corral, Otilia Mó, Manuel Yáñez, Ibon Alkorta, José Elguero
The F(-), Cl(-), CN(-), NO2(-), NO3(-), and SO4(2-) anion affinities of 4,5-bis(BeX)-fluorene (X = H, F, Cl, CN, NC, and OCH3) derivatives have been calculated at the B3LYP/6-311+G(3df,2p)//B3LYP/6-31+G(d,p) level of theory. The reliability of this approach was assessed using, for some suitable cases, the accurate G4MP2 ab initio composite method as a reference. The values obtained indicate that these derivatives exhibit anion affinities which are among the largest ones reported for single neutral molecules, and therefore these compounds behave as anion sponges, very much as their 1,8-diBeX-naphthalene analogues...
August 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28815881/corrigendum-photoinduced-dna-interstrand-cross-link-formation-by-naphthalene-boronates-via-a-carbocation
#2
Yibin Wang, Zechao Lin, Heli Fan, Xiaohua Peng
No abstract text is available yet for this article.
August 16, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28815793/responsiveness-and-morphology-study-of-dual-stimuli-controlled-supramolecular-polymer
#3
Chenxiao Xiong, Meiran Xie, Ruyi Sun
The synthesis and characterization of a linear supramolecular polymer formed by dual host-guest recognitions is presented. The polymer linked by the orthogonal interactions of azobenzene with β-cyclodextrin and methyl viologen with sulfonatocalix[4]arene is constructed, and the morphology change along with the formation and vanishment of host-guest interaction is investigated. The reversible disassembly-reassembly of the polymer induced by light and the redox process are monitored by UV-vis and cyclic voltammetry, respectively...
August 16, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28815774/excitonically-coupled-states-in-crystalline-coordination-networks
#4
Ritesh Haldar, Antoine Mazel, Reetu Joseph, Michael Adams, Ian Howard, Bryce Richards, Manuel Tsotsalas, Engelbert Redel, Stephane Diring, Fabrice Odobel, Christof Wöll
When chromophores are brought into close proximity, noncovalent interactions (π-π/CH-π) can lead to the formation of excitonically coupled states, which bestow new photophysical properties upon the aggregates. Since the properties of the new states not only depend on the strength of intermolecular interactions, but also on the relative orientation, supramolecular assemblies, where these parameters can be varied in a deliberate fashion, provide novel possibilities for the control of photophysical properties...
August 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28813539/vectorization-by-nanoparticles-decreases-the-overall-toxicity-of-airborne-pollutants
#5
Rodolphe Carpentier, Anne Platel, Helena Maiz-Gregores, Fabrice Nesslany, Didier Betbeder
Atmospheric pollution is mainly composed of volatile pollutants and particulate matter that strongly interact. However, their specific roles in the induction of cellular toxicity, in particular the impact of the vectorization of atmospheric pollutants by ultrafine particles, remains to be fully elucidated. For this purpose, non-toxic poly-lactic co-glycolic acid (PLGA) nanoparticles were synthesized and three pollutants (benzo(a)pyrene, naphthalene and di-ethyl-hexyl-phthalate) were adsorbed on the surface of the nanoparticles in order to evaluate the toxicity (cytotoxicity, genotoxicity and ROS induction) of these complexes to a human airway epithelial cell line...
2017: PloS One
https://www.readbyqxmd.com/read/28811071/biological-evaluation-of-2-pyrazolinyl-1-carbothioamide-derivatives-against-hct116-human-colorectal-cancer-cell-lines-and-elucidation-on-qsar-and-molecular-binding-modes
#6
Beom Soo Kim, Soon Young Shin, Seunghyun Ahn, Dongsoo Koh, Young Han Lee, Yoongho Lim
In the search of compounds exhibiting anticancer activity, 37 derivatives of 2-pyrazolinyl-1-carbothioamide were designed and synthesized. Clonogenic cell survival assays were adapted to measure the cytotoxicities of the synthetic derivatives against HCT116 human colon cancer cell lines. Half-maximal cell growth inhibitory concentrations (GI50) ranged from 0.49 to 41.22µM. The compound with the lowest GI50 value, 3-(2-hydroxy-4,5-dimethoxyphenyl)-5-(naphthalen-1-yl)-N-(3,4,5-trimethoxyphenyl)-pyrazolinyl-1-carbothioamide, was subjected to further biological studies, including cell viability and apoptosis assays to examine levels of annexin-V in the outer plasma membrane layer and poly ADP-ribose polymerase cleavage...
August 4, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28810221/new-naphthalene-whole-cell-bioreporter-for-measuring-and-assessing-naphthalene-in-polycyclic-aromatic-hydrocarbons-contaminated-site
#7
Yujiao Sun, Xiaohui Zhao, Dayi Zhang, Aizhong Ding, Cheng Chen, Wei E Huang, Huichun Zhang
A new naphthalene bioreporter was designed and constructed in this work. A new vector, pWH1274_Nah, was constructed by the Gibson isothermal assembly fused with a 9 kb naphthalene-degrading gene nahAD (nahAa nahAb nahAc nahAd nahB nahF nahC nahQ nahE nahD) and cloned into Acinetobacter ADPWH_lux as the host, capable of responding to salicylate (the central metabolite of naphthalene). The ADPWH_Nah bioreporter could effectively metabolize naphthalene and evaluate the naphthalene in natural water and soil samples...
August 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/28809112/mofs-for-the-sensitive-detection-of-ammonia-deployment-of-fcu-mof-thin-films-as-effective-chemical-capacitive-sensors
#8
Ayalew Hussen Assen, Omar Yassine, Osama Shekhah, Mohamed Eddaoudi, Khaled N Salama
This work reports on the fabrication and deployment of a select metal-organic framework (MOF) thin film as an advanced chemical capacitive sensor for the sensing/detection of ammonia (NH3) at room temperature. Namely, the MOF thin film sensing layer consists of a rare-earth (RE) MOF (RE-fcu-MOF) deposited on a capacitive interdigitated electrode (IDE). Purposely, the chemically stable naphthalene-based RE-fcu-MOF (NDC-Y-fcu-MOF) was elected and prepared/arranged as a thin film on a pre-functionalized capacitive IDE via the solvothermal growth method...
August 15, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28806681/human-biomonitoring-of-polycyclic-aromatic-hydrocarbonsand-metals-in-the-general-population-residing-near-the-municipal-solid-waste-incinerator-of-modena-italy
#9
Maria Giulia Gatti, Petra Bechtold, Laura Campo, Giovanna Barbieri, Giulia Quattrini, Andrea Ranzi, Sabrina Sucato, Luca Olgiati, Elisa Polledri, Michael Romolo, Laura Iacuzio, Giuliano Carrozzi, Paolo Lauriola, Carlo A Goldoni, Silvia Fustinoni
BACKGROUND AND OBJECTIVES: A cross-sectional biomonitoring study was carried out to investigate exposure to incinerator emission in relation to the body burden of selected biomarkers in the population living around the plant. METHODS: Approximately 500 people, aged 18-69 yrs, living within 4 km from the incinerator were randomly selected form the population register. Exposure was measured through fall-out maps of particulate matter (PM), used as tracer for incinerator emissions...
August 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/28803881/cell-specific-and-dose-dependent-effects-of-pahs-on-proliferation-cell-cycle-and-apoptosis-protein-expression-and-hormone-secretion-by-placental-cell-lines
#10
Eliza Drwal, Agnieszka Rak, Adam Grochowalski, Tomasz Milewicz, Ewa Lucja Gregoraszczuk
In the preset study we measured the concentrations of 16 priority PAHs in maternal blood and placental tissue by using the GC-MS/MS system, and investigated the effects of selected PAHs (naphthalene, anthracene, phenanthrene, pyrene) and mixtures on BeWo and JEG-3 human placental cell line proliferation (Alamar Blue), cytotoxicity (3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide (XTT), lactate dehydrogenase (LDH), acid phosphatase (AP), endocrine activity (progesterone and estradiol secretion) and apoptosis (cyclin A1, cyclin D2, cdk 2, cdk 4, Bcl-xl, Bax, and caspase-3 protein expression)...
August 10, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/28803190/legacy-and-new-halogenated-persistent-organic-pollutants-in-polar-bears-from-a-contamination-hotspot-in-the-arctic-hudson-bay-canada
#11
R J Letcher, A D Morris, M Dyck, E Sverko, E J Reiner, D A D Blair, S G Chu, L Shen
A large and complex suite of 295 legacy and new halogenated persistent organic pollutants (POPs) were investigated in fat or liver tissue samples of polar bears collected in 2013-2014 from Southern (SHB) and Western (WHB) subpopulations of the Canadian Arctic contaminants hotspot of Hudson Bay. A total of 210 POPs were detected and/or quantifiable with some frequency in all fat or liver samples. POP profile and concentration differences were investigated both within (e.g. age and sex) and between the two subpopulations...
August 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28802992/effects-of-humic-acid-and-heavy-metals-on-the-sorption-of-polar-and-apolar-organic-pollutants-onto-biochars
#12
Fei Wang, Hongwen Sun, Xinhao Ren, Yarui Liu, Hongkai Zhu, Peng Zhang, Chao Ren
The effects of humic acid (HA) and heavy metals (Cu(2+) and Ag(+)) on the sorption of polar and apolar organic pollutants onto biochars that were produced at temperatures of 200 °C (BC200) and 700 °C (BC700) were studied. Due to the plentiful polar functional groups on BC200, cationic propranolol exhibited higher levels of sorption than naphthalene on BC200 while naphthalene and propranolol showed similar sorption capacities on BC700. HA changed the characteristics of biochars and generally inhibited the sorption of target organic pollutants on biochars; however, enhancement occurred in some cases depending on the pollutants involved and their concentrations, biochars used and the addition sequences and concentrations of HA...
August 10, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28802977/adsorption-and-coadsorption-mechanisms-of-cr-vi-and-organic-contaminants-on-h3po4-treated-biochar
#13
Nan Zhao, Chuanfang Zhao, Yizhong Lv, Weifang Zhang, Yuguo Du, Zhengping Hao, Jing Zhang
The study of simultaneous removal of heavy metals and organic contaminants has practical applications due to the coexistence of complex pollutants in the wastewater or soil. In this work, biochar was prepared to study the removal efficiencies of Cr(VI), naphthalene (NAP) and bisphenol A (BPA) in the single or mixed systems. H3PO4-treated biochar presented a much higher adsorption capacity of the pollutants than the untreated biochar and also showed a high resistance to coexisting salts. The maximum adsorption capacities for Cr(VI) and BPA were 116...
August 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/28794938/selective-recognition-of-fluoride-by-using-a-benzobisimidazolium-derivative-through-aggregation-induced-fluorescence
#14
Dayoung Lee, Chiho Lee, Eun Jin Jun, Minji Lee, Sungnam Park, Juyoung Yoon
A new benzobisimidazolium derivative (1) bearing four naphthalene moieties was synthesized and demonstrated as an F(-) ion-selective fluorescent chemosensor. The fluorescence of 1 in acetonitrile (CH3CN) is significantly stronger with F(-) and acetate (CH3CO2(-)), but not with other anions (Cl(-), Br(-), I(-), HSO4(-), and H2PO4(-)). The fluorescence of 1 is enhanced selectively with F(-) in the presence of a small amount of water. Our DFT calculations indicate that the electrostatic interactions between the positively charged benzobisimidazolium moieties and F(-) play an important role in the formation of stable aggregates...
August 2017: ChemistryOpen
https://www.readbyqxmd.com/read/28794929/high-frequency-direct-shoot-organogenesis-of-leaf-explants-and-a-comparative-evaluation-of-phytochemicals-antioxidant-potential-of-wild-vs-in-vitro-plant-extracts-of-lysimachia-laxa
#15
Sanjoy Gupta, Tapan Seal, A A Mao, Soneswar Sarma
The present studies were attempted to develop direct shoot organogenesis from in vitro grown leaf explants of Lysimachia laxa and comparative evaluation of phytochemical and antioxidant potential of in vitro raised and wild plants extracts. The fresh leaves of this species are used for deworming gastrointestinal worm infection in traditional medicine. Overexploitation of this species and poor regeneration has led to rapid decline in wild population, therefore, present investigation was attempted to develop an efficient rapid mass propagation protocol for this species...
August 2017: 3 Biotech
https://www.readbyqxmd.com/read/28783190/endocrine-disrupting-potential-of-pahs-and-their-alkylated-analogues-associated-with-oil-spills
#16
Sangwoo Lee, Seongjin Hong, Xiaoshan Liu, Cheolmin Kim, Dawoon Jung, Un Hyuk Yim, Won Joon Shim, Jong Seong Khim, John P Giesy, Kyungho Choi
Polycyclic aromatic hydrocarbons (PAHs) and alkylated PAHs are known to be major toxic contaminants in spills of petroleum hydrocarbons (oil). Spilled oil undergoes weathering and over time, PAHs go through a series of compositional changes. PAHs can disrupt endocrine functions, and the type of functions affected and associated potencies vary with the type and alkylation status of PAH. In this study, the potential of five major PAHs of crude oil, i.e., naphthalene, fluorene, dibenzothiophene, phenanthrene, and chrysene, and their alkylated analogues (n = 25), to disrupt endocrine functions was evaluated by use of MVLN-luc and H295R cell lines...
August 7, 2017: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/28778014/emissions-of-brominated-compounds-and-polycyclic-aromatic-hydrocarbons-during-pyrolysis-of-e-waste-debrominated-in-subcritical-water
#17
Aurora Soler, Juan A Conesa, Nuria Ortuño
Degradation of brominated flame retardants present in printed circuit boards (PCBs) was tested using subcritical water in a high pressure reactor. Debromination experiments were carried out in a batch stirred reactor at three different temperatures (225 °C, 250 °C and 275 °C) keeping a solid to liquid (S/L) ratio of PCB:water = 1:5 during 180 min. Results indicated that debromination efficiency was increased with temperature (18.5-63.6% of bromine present in the original PCB was removed). Thermal decomposition of the debrominated materials was studied and compared with that of the original PCB...
July 30, 2017: Chemosphere
https://www.readbyqxmd.com/read/28770505/periodic-characterization-of-alkyl-naphthalenes-in-stack-gas-and-ambient-air-around-a-medical-waste-incinerator
#18
Olusola Adedayo Adesina, Jacob Ademola Sonibare, Paul N Diagboya, Adesuji Adejuwon, Temitope Famubode, Josiah O Bello
Due to the subtle occurrence of environmental polycyclic aromatic hydrocarbon (PAHs) pollution from incinerators, it is seldom considered a significant source of PAH pollution. However, considering the recent build-up of toxics in urban air, this may be a serious concern around the incinerator vicinity due to the potential consequences of PAHs on human health. Hence, this study determined 11 alkyl-naphthalene contributions from a hospital waste incinerator (HWI_0) into ambient air receptor points (HWI_1 to HWI_5) for a 1-year period: June 2014-May 2015...
August 3, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28766633/structure-and-reactivities-of-rhenium-and-technetium-bis-arene-sandwich-complexes-m-%C3%AE-6-arene-2
#19
Giuseppe Meola, Henrik Braband, Sara Jordi, Thomas Fox, Olivier Blacque, Bernhard Spingler, Roger Alberto
Sandwich complexes are important building blocks in medicinal inorganic chemistry for group 6 and 8 elements but are almost unknown for the manganese triad. We present the syntheses and full characterization of the mixed-arene (99)Tc sandwich complexes [(99)Tc(η(6)-hmbz)(η(6)-C6H5-NH3)](PF6)2 and [(99)Tc(η(6)-hmbz)(η(6)-C6H5-Br)](PF6). Both comprise functionalities for conjugation to targeting molecules or for being included as substructures in pharmaceutically active lead compounds. Since η(6)-benzene ligands are too stably bound to be replaced with incoming ligands, we prepared naphthalene complexes [Re(η(6)-C6H6)(η(6)-napht)](+) and [Re(η(6)-napht)2](+)...
August 2, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28765606/2-oxoesters-a-novel-class-of-potent-and-selective-inhibitors-of-cytosolic-group-iva-phospholipase-a2
#20
Maroula G Kokotou, Gerasimia Galiatsatou, Victoria Magrioti, Giorgos Koutoulogenis, Efrosini Barbayianni, Dimitris Limnios, Varnavas D Mouchlis, Banita Satpathy, Aaron Navratil, Edward A Dennis, George Kokotos
Cytosolic phospholipase A2 (GIVA cPLA2) is the only PLA2 that exhibits a marked preference for hydrolysis of arachidonic acid containing phospholipid substrates releasing free arachidonic acid and lysophospholipids and giving rise to the generation of diverse lipid mediators involved in inflammatory conditions. Thus, the development of potent and selective GIVA cPLA2 inhibitors is of great importance. We have developed a novel class of such inhibitors based on the 2-oxoester functionality. This functionality in combination with a long aliphatic chain or a chain carrying an appropriate aromatic system, such as the biphenyl system, and a free carboxyl group leads to highly potent and selective GIVA cPLA2 inhibitors (X I(50) values 0...
August 1, 2017: Scientific Reports
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