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https://www.readbyqxmd.com/read/29668000/cd-in-codoped-tio-2-nanochips-for-high-efficiency-photocatalytic-dye-degradation
#1
Dongliang Liu, Peng Huang, Yong Liu, Zhou Wu, Dongsheng Li, Jun Guo, Tao Wu
Titanium dioxide has been widely investigated in the field of photocatalysis research. However, the wide bandgap (3.2 eV) greatly limits its practical applications because only ultraviolet light can be absorbed by bare TiO2. Herein, we report a facile approach to prepare Cd/In-codoped TiO2 nanochips with the capability of visible light absorption. Such bimetallic-doped TiO2 was synthesized through a two-step process: Cd/In/S-TiO2 gels were first synthesized by mixing the preformed Cd-In-S supertetrahedral nanoclusters with a titanium source, and the subsequent pyrolytic process effectively converted the gels into Cd/In-TiO2 nanochips with a thickness of ∼2...
April 18, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29667939/a-photochemical-approach-for-a-fast-and-self-limited-covalent-modification-of-surface-supported-graphene-with-photoactive-dyes
#2
Natalia Sergeeva, Alexander N Chaika, Brian Walls, Barry Murphy, Killian Walshe, David Martin, Billy D O Richards, Gin Jose, K Fleischer, Victor Aristov, Olga Molodtsova, Igor V Shvets, Sergey Krasnikov
Herein, we report a simple method for a covalent modification of surface-supported graphene with photoactive dyes. Graphene was fabricated on cubic-SiC/Si(001) wafers due to their low cost and suitability for mass-production of continuous graphene fit for electronic applications on millimetre scale. Functionalisation of the graphene surface was carried out in solution via white light-induced photochemical generation of phenazine radicals from phenazine diazonium salt. The resulting covalently bonded phenazine-graphene hybrid structure was characterised by scanning tunnelling microscopy (STM) and spectroscopy (STS), Raman spectroscopy and density functional theory (DFT) calculations...
April 18, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29667832/synthesis-crystal-structure-and-the-deep-near-infrared-absorption-emission-of-bright-azabodipy-based-organic-fluorophores
#3
Wanle Sheng, Yayang Wu, Changjiang Yu, Petia Bobadova-Parvanova, Erhong Hao, Lijuan Jiao
Annularly fused azaBODIPY-based organic fluorophores (HBPs 2) containing up to 13 aromatic ring fusions were synthesized by a Suzuki coupling reaction with bromoazadipyrromethenes and a subsequent regioselective oxidative ring-fusion reaction. X-ray analysis indicates almost planar dipyrrin cores for all crystals but overall curved or "wave" conformations for those HBP dyes. These molecules exhibit unique structural and physical properties including excellent spectral selectivity (negligible absorption between 300 and 700 nm), sharp near-infrared (NIR) absorption (up to 878 nm) and emission (up to 907 nm), large extinction coefficient (up to 4...
April 18, 2018: Organic Letters
https://www.readbyqxmd.com/read/29667813/a-sensitive-water-soluble-reversible-optical-probe-for-hg-2-detection
#4
Sayani Das, Anindita Sarkar, Ananya Rakshit, Ankona Datta
We report the serendipitous discovery of an optical mercury sensor while trying to develop a water-soluble manganese probe. The sensor is based on a pentaaza macrocycle conjugated to a hemicyanine dye. The pentaaza macrocycle earlier designed in our group was used to develop photoinduced electron transfer (PET)-based "turn-on" fluorescent sensors for manganese. (1) In an attempt to increase the water-solubility of the manganese sensors we changed the dye from BODIPY to hemicyanine. The resultant molecule qHCM afforded a distinct reversible change in the absorption features and a concomitant visible color change upon binding to Hg2+ ions, leading to a highly water-soluble mercury sensor with a 10 ppb detection limit...
April 18, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29667627/propofol-inhibits-hela-cells-by-impairing-autophagic-flux-via-amp-activated-protein-kinase-ampk-activation-and-endoplasmic-reticulum-stress-regulated-by-calcium
#5
Xi Chen, Kai Li, Guoqing Zhao
BACKGROUND Propofol has antitumor effects against various cancers. However, the mechanism of action of propofol in HeLa human cervical cancer cells has not been elucidated. MATERIAL AND METHODS We treated HeLa human cervical cancer cells with different concentrations of propofol. Cell viability was evaluated with Cell Counting Kit-8 and apoptosis was analyzed by annexin V-fluorescein isothiocyanate and propidium iodide staining and flow cytometry. Autophagosome formation was evaluated based on microtubule-associated protein light chain (LC)3 conversion and light chain 3 puncta formation...
April 18, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29667533/the-use-of-metal-hydroxide-sludge-in-natura-and-calcined-for-the-adsorption-of-brilliant-blue-dye-in-aqueous-solution
#6
Ana Maria Salgueiro Baptisttella, Andressa Aziz Diniz Araújo, Matheus Caldas Barreto, Vivian Stumpf Madeira, Mauricio Alves da Motta Sobrinho
Industrial waste such as metal hydroxide sludge (in natura and calcined) from galvanic bath was evaluated as an adsorbent in the removal of brilliant blue synthetic dye (NB 180) in aqueous solution. The samples were characterised using X-ray fluorescence analysis (XRF), X-ray diffraction analysis (XRD), thermogravimetric analysis (TGA), infrared spectroscopy (FT - IR), as well as the specific surface area (BET) and the point of zero charge (pHZCP ). The effects of the conditions in relation to pH and adsorbent dosage were also investigated...
April 18, 2018: Environmental Technology
https://www.readbyqxmd.com/read/29667472/evaluation-of-the-effect-of-pulsed-dye-laser-on-chronic-psoriatic-plaque
#7
Nagwa Mohammad Elwan, Shereen Farouk Gheida, Soha Abdalla Hawwam, Abeer Hussien Ahmed
Psoriasis is one of the most prevalent immune mediated skin diseases. Selective vascular destruction by pulsed dye laser is considered one of effective laser treatments. OBJECTIVE: Evaluation of the therapeutic effect of pulsed dye laser in treatment of chronic psoriatic plaque lesions and changes in human beta defensin-2 expression in the psoriatic patients before and after treatment, with correlation to the clinical improvement. METHODS: Twenty patients with psoriatic plaque on right side treated by laser and another plaque on left side similar in size and severity score as control receiving no treatment...
April 18, 2018: Journal of Dermatological Treatment
https://www.readbyqxmd.com/read/29666910/ontogeny-and-development-of-the-tritocerebral-commissure-giant-tcg-an-identified-neuron-in-the-brain-of-the-grasshopper-schistocerca-gregaria
#8
George Stephen Boyan, Leslie Williams, Tobias Müller, Jonathan P Bacon
The tritocerebral commissure giant (TCG) of the grasshopper Schistocerca gregaria is one of the best anatomically and physiologically described arthropod brain neurons. A member of the so-called Ventral Giant cluster of cells, it integrates sensory information from visual, antennal and hair receptors, and synapses with thoracic motor neurons in order to initiate and regulate flight behavior. Its ontogeny, however, remains unclear. In this study, we use bromodeoxyuridine incorporation and cyclin labeling to reveal proliferative neuroblasts in the region of the embryonic brain where the ventral giant cluster is located...
April 17, 2018: Development Genes and Evolution
https://www.readbyqxmd.com/read/29666792/steady-state-linear-and-non-linear-optical-spectroscopy-of-organic-chromophores-and-bio-macromolecules
#9
REVIEW
Marco Marazzi, Hugo Gattuso, Antonio Monari, Xavier Assfeld
Bio-macromolecules as DNA, lipid membranes and (poly)peptides are essential compounds at the core of biological systems. The development of techniques and methodologies for their characterization is therefore necessary and of utmost interest, even though difficulties can be experienced due to their intrinsic complex nature. Among these methods, spectroscopies, relying on optical properties are especially important to determine their macromolecular structures and behaviors, as well as the possible interactions and reactivity with external dyes-often drugs or pollutants-that can (photo)sensitize the bio-macromolecule leading to eventual chemical modifications, thus damages...
2018: Frontiers in Chemistry
https://www.readbyqxmd.com/read/29666700/oil-palm-phenolics-inhibit-the-in-vitro-aggregation-of-%C3%AE-amyloid-peptide-into-oligomeric-complexes
#10
Robert P Weinberg, Vera V Koledova, Hyeari Shin, Jennifer H Park, Yew Ai Tan, Anthony J Sinskey, Ravigadevi Sambanthamurthi, ChoKyun Rha
Alzheimer's disease is a severe neurodegenerative disease characterized by the aggregation of amyloid- β peptide (A β ) into toxic oligomers which activate microglia and astrocytes causing acute neuroinflammation. Multiple studies show that the soluble oligomers of A β 42 are neurotoxic and proinflammatory, whereas the monomers and insoluble fibrils are relatively nontoxic. We show that A β 42 aggregation is inhibited in vitro by oil palm phenolics (OPP), an aqueous extract from the oil palm tree (Elaeis guineensis) ...
2018: International Journal of Alzheimer's Disease
https://www.readbyqxmd.com/read/29666419/efficient-white-phosphorescent-organic-light-emitting-diodes-using-ultrathin-emissive-layers-1-nm
#11
Haojian Yu, Xudong Dai, Fangnan Yao, Xiang Wei, Jin Cao, Chulgyu Jhun
In this paper, efficient phosphorescent white organic light-emitting diodes (WOLEDs) were fabricated based on ultrathin doping-free emissive layers and mixed bipolar interlayers. The energy transfer processes were proved via the research of WOLEDs with different interlayer thicknesses and transient photoluminescence lifetime. WOLEDs with optimized thickness of doping-free emissive layers show maximum current efficiency of 47.8 cd/A and 44.9 cd/A for three-colors and four-colors WOLEDs, respectively. The Commission Internationale de L'Eclairage coordinates shows a very slight variation of ( ± 0...
April 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29666416/photoluminescence-quenching-of-dye-molecules-near-a-resonant-silicon-nanoparticle
#12
Mikhail V Zyuzin, Denis G Baranov, Alberto Escudero, Indranath Chakraborty, Anton Tsypkin, Elena V Ushakova, Florain Kraus, Wolfgang J Parak, Sergey V Makarov
Luminescent molecules attached to resonant colloidal particles are an important tool to study light-matter interaction. A traditional approach to enhance the photoluminescence intensity of the luminescent molecules in such conjugates is to incorporate spacer-coated plasmonic nanoantennas, where the spacer prevents intense non-radiative decay of the luminescent molecules. Here, we explore the capabilities of an alternative platform for photoluminescence enhancement, which is based on low-loss Mie-resonant colloidal silicon particles...
April 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29665961/orchestration-of-the-expression-of-the-laccase-multigene-family-in-white-rot-basidiomycete-trametes-hirsuta-072-evidences-of-transcription-level-subfunctionalization
#13
Konstantin V Moiseenko, Daria V Vasina, Katerina T Farukshina, Olga S Savinova, Olga A Glazunova, Tatiana V Fedorova, Tatiana V Tyazhelova
Laccase (benzenediol:oxygen oxidoreductase, EC 1.10.3.2) is an enzyme that has been studied for over 100 y and is present in virtually all fungi. As increasing numbers of fungal genomes have been sequenced, it has become apparent that the laccase genes in white-rot fungi commonly form multigene families consisting of many nonallelic genes. Although a number of reports focussing on laccase gene expression in different fungal species were published over the decades, the fundamental questions of why fungi need such a redundant array of genes and how they manage this array to perform biological function(s) remain far from answered...
May 2018: Fungal Biology
https://www.readbyqxmd.com/read/29665689/the-human-sweet-receptor-t1r3-is-functional-in-human-gastric-parietal-tumor-cells-hgt-1-and-modulates-cyclamate-and-acesulfame-k-induced-mechanisms-of-gastric-acid-secretion
#14
Muhammet Zopun, Kathrin I Liszt, Verena Stoeger, Maik Behrens, Ulrike Redel, Jakob P Ley, Joachim Hans, Veronika Somoza
The non-caloric sweeteners (NCS) cyclamate (Cycl) and acesulfame K (AceK) are widely added to foods and beverages. Little is known about their impact on gastric acid secretion (GAS), which is stimulated by dietary protein and bitter-tasting compounds. Since Cycl and AceK have a bitter off-taste in addition to their sweet-taste, we hypothesized they modulate mechanisms of GAS in human gastric parietal cells (HGT-1). HGT-1 cells were exposed to sweet tastants (50 mM of glucose, D-threonine, Cycl or AceK), and analyzed for their intracellular pH index (IPX), as indicator of proton secretion by means of a pH-sensitive dye, and for mRNA-levels of GAS-associated genes by RT-qPCR...
April 17, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29665682/hierarchical-fe2o3-c-mno2-c-multi-shell-nanocomposites-for-high-performance-lithium-ion-battery-and-catalyst
#15
Yu Zhang, Qing Li, Jiwei Liu, Wenbin You, Fang Fang, Min Wang, Renchao Che
The Fe2O3@C@MnO2@C (FCMC) nanocomposites containing spindle-like Fe2O3 as a core and MnO2 nanosheets as a sandwiched shell and double carbon layers have been successfully prepared by a facile method. As anode materials of lithium ion batteries (LIBs), the cycling stability, rate performance and conductivity of the prepared FCMC are far beyond that of the carbon-free Fe2O3@MnO2 (FM) nanocomposites. The hierarchical structure with double layers of carbon effectively enhances the ion conductivity and electrochemical performance of transitional metal oxides, indicating that carbon in FCMC played an important role during lithium ion storage...
April 17, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29665473/magnetic-metal-organic-frameworks-for-fast-and-efficient-solid-phase-extraction-of-six-sudan-dyes-in-tomato-sauce
#16
Xin-Ran Shi, Xue-Lei Chen, Yu-Lan Hao, Li Li, Hou-Jun Xu, Man-Man Wang
Magnetic solid-phase extraction is an effective and useful technique to preconcentrate trace analytes from food samples. In this study, a magnetic trimeric chromium octahedral metal-organic framework (Fe3 O4 -NH2 @MIL-101) was fabricated and characterized. Fe3 O4 -NH2 @MIL-101 was applied as an adsorbent of magnetic solid-phase extraction combined with high performance liquid chromatography to effectively isolate and simultaneously determine six Sudan dyes (Para Red, Sudan I-IV, and Sudan Red 7B) from tomato sauce...
April 10, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29665388/expression-and-characterization-of-novel-laccase-gene-from-pandoraea-sp-istkb-and-its-application
#17
Madan Kumar, Arti Mishra, Shashi Shekhar Singh, Shaili Srivastava, Indu Shekhar Thakur
In the present study, a non-blue laccase gene from previously reported lignin degrading bacterium, Pandoraea sp. ISTKB, was isolated, cloned and expressed in E. coli. Bioinformatics analysis of sequence discovered twin-arginine translocation signal sequence, copper binding motifs and presence of more random coil compare to helices and sheets in structure. The enzyme was found to be active on wide pH range and the pH optima was observed at pH 4 and 8 on substrate 2,2'-Azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) and 2,6-Dimethoxyphenol respectively...
April 14, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29665269/highly-fluorescent-magnetic-nanobeads-with-a-remarkable-stokes-shift-as-labels-for-enhanced-detection-in-immunoassays
#18
Francesca Salis, Ana B Descalzo, Elena Benito-Peña, María C Moreno-Bondi, Guillermo Orellana
Fluorescence immunoassays are popular for achieving high sensitivity, but they display limitations in biological samples due to strong absorption of light, background fluorescence from matrix components, or light scattering by the biomacromolecules. A powerful strategy to overcome these problems is introduced here by using fluorescent magnetic nanobeads doped with two boron-dipyrromethane dyes displaying intense emission in the visible and near-infrared regions, respectively. Careful matching of the emission and absorption features of the dopants leads to a virtual Stokes shift larger than 150 nm achieved by an intraparticle Förster resonance energy transfer (FRET) process between the donor and the acceptor dyes...
April 17, 2018: Small
https://www.readbyqxmd.com/read/29665187/redox-responsive-covalent-organic-nanosheets-from-viologens-and-calix-4-arene-for-iodine-and-toxic-dye-capture
#19
Tina Skorjanc, Dinesh Shetty, Sudhir Sharma, Jesus Raya, Hassan Traboulsi, Dong-Suk Han, Jayesh Lalla, Ryan Newlon, Ramesh Jagannathan, Serdal Kirmizialtin, John-Carl Olsen, Ali Trabolsi
Owing to their chemical and thermal stabilities, high uptake capacities, and easy recyclability, covalent organic polymers (COPs) have shown promise as pollutant sponges. Here, we describe the use of diazo coupling to synthesize two cationic COPs, COP1++ and COP2++, that incorporate a viologen-based molecular switch and an organic macrocycle, calix[4]arene. Both COPs form nanosheets with height profiles of 6.00 and 8.00 nm, respectively, based on AFM measurements. The sheets remain morphologically intact upon one- or two-electron reductions of their viologen subunits...
April 17, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29665023/propidium-monoazide-real-time-loop-mediated-isothermal-amplification-for-specific-visualization-of-viable-salmonella-in-food
#20
Jiehong Fang, Yingying Wu, Daofeng Qu, Biao Ma, Xiaoping Yu, Mingzhou Zhang, Jianzhong Han
Traditional DNA-based molecular detection assays, including loop-mediated isothermal amplification (LAMP), are unable to differentiate between viable and dead cells. We developed a rapid and accurate method for detection of viable Salmonella cells in food using calcein dyed visual real-time LAMP combined with propidium monoazide (PMA) treatment. Amplification of DNA from up to 6.3 × 105 CFU ml-1 dead Salmonella cells was inhibited by 5 μmol l-1 PMA dye, whereas the DNA derived from viable cells were detected according the invA gene...
April 17, 2018: Letters in Applied Microbiology
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