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Chemical luminescence

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https://www.readbyqxmd.com/read/28346090/identifying-inhibitors-of-the-hsp90-aha1-protein-complex-a-potential-target-to-drug-cystic-fibrosis-by-alpha-technology
#1
Verena Ihrig, Wolfgang M J Obermann
Deletion of a single phenylalanine residue at position 508 of the protein CFTR (cystic fibrosis transmembrane conductance regulator), a chloride channel in lung epithelium, is the most common cause for cystic fibrosis. As a consequence, folding of the CFTRΔF508 protein and delivery to the cell surface are compromised, resulting in degradation of the polypeptide. Accordingly, decreased surface presence of CFTRΔF508 causes impaired chloride ion conductivity and is associated with mucus accumulation, a hallmark of cystic fibrosis...
January 1, 2017: SLAS Discov
https://www.readbyqxmd.com/read/28345696/interfacially-al-doped-zno-nanowires-greatly-enhanced-near-band-edge-emission-through-suppressed-electron-phonon-coupling-and-confined-optical-field
#2
Yiming Wu, Yanmeng Dai, Shenlong Jiang, Chao Ma, Yue Lin, Dongxue Du, Yukun Wu, Huaiyi Ding, Qun Zhang, Nan Pan, Xiaoping Wang
Aluminium (Al)-doped zinc oxide (ZnO) nanowires (NWs) with a unique core-shell structure and a Δ-doping profile at the interface were successfully grown using a combination of chemical vapor deposition re-growth and few-layer AlxOy atomic layer deposition. Unlike the conventional heavy doping which degrades the near-band-edge (NBE) luminescence and increases the electron-phonon coupling (EPC), it was found that there was an over 20-fold enhanced NBE emission and a notably-weakened EPC in this type of interfacially Al-doped ZnO NWs...
March 27, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28337322/platinum-ii-ring-fused-chlorins-as-near-infrared-emitting-oxygen-sensors-and-photodynamic-agents
#3
Nelson A M Pereira, Mafalda Laranjo, João Casalta-Lopes, Arménio C Serra, Marta Piñeiro, João Pina, J Sérgio Seixas de Melo, Mathias O Senge, M Filomena Botelho, Liliana Martelo, Hugh D Burrows, Teresa M V D Pinho E Melo
Novel near-infrared luminescent compounds based on platinum(II) 4,5,6,7-tetrahydropyrazolo[1,5-a]pyridine-fused chlorins are described. These compounds have high photostability and display light emission, in particular simultaneous fluorescence and phosphorescence emission in solution at room temperature, in the biologically relevant 700-850 nm red and near-infrared (NIR) spectral region, making them excellent materials for biological imaging. The simultaneous presence of fluorescence and phosphorescence emission at room temperature, with the phosphorescence strongly quenched by oxygen whereas fluorescence remains unaffected, allows these compounds to be used as ratiometric oxygen sensors in chemical and biological media...
March 9, 2017: ACS Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28335326/tuning-the-emission-energy-of-chemically-doped-graphene-quantum-dots
#4
Noor-Ul-Ain, Martin O Eriksson, Susann Schmidt, M Asghar, Pin-Cheng Lin, Per Olof Holtz, Mikael Syväjärvi, G Reza Yazdi
Tuning the emission energy of graphene quantum dots (GQDs) and understanding the reason of tunability is essential for the GOD function in optoelectronic devices. Besides material-based challenges, the way to realize chemical doping and band gap tuning also pose a serious challenge. In this study, we tuned the emission energy of GQDs by substitutional doping using chlorine, nitrogen, boron, sodium, and potassium dopants in solution form. Photoluminescence data obtained from (Cl- and N-doped) GQDs and (B-, Na-, and K-doped) GQDs, respectively exhibited red- and blue-shift with respect to the photoluminescence of the undoped GQDs...
November 3, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28303168/nayf4-er-3-yb-3-sio2-core-shell-upconverting-nanocrystals-for-luminescence-thermometry-up-to-900-k
#5
Robin G Geitenbeek, P Tim Prins, Wiebke Albrecht, Alfons van Blaaderen, Bert M Weckhuysen, Andries Meijerink
The rapid development of nanomaterials with unique size-tunable properties forms the basis for a variety of new applications, including temperature sensing. Luminescent nanoparticles (NPs) have demonstrated potential as sensitive nanothermometers, especially in biological systems. Their small size offers the possibility of mapping temperature profiles with high spatial resolution. The temperature range is however limited, which prevents use in high-temperature applications such as, for example, nanoelectronics, thermal barrier coatings, and chemical reactors...
February 16, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28287741/ph-elicited-luminescence-functionalities-of-carbon-dots-mechanistic-insights
#6
Sharmistha Dutta Choudhury, Jiddhu M Chethodil, Poojan Milan Gharat, Praseetha P K, Haridas Pal
Remarkable and systematic pH dependent changes are observed in the absorption and emission spectra of carbon dots derived for the first time, from lemon juice, a natural bio-resource. Detailed photophysical studies of these novel carbon dots (henceforth referred as LD), in conjunction with FTIR spectra, reveal that among the two possible prototropic equilibria, phenol ↔ phenolate and carboxylic ↔ carboxylate, that occur at the surface of LD; it is the former that is actually coupled with the emissive moiety and directly involved in determining the nature of the electronic energy levels and the associated optical transitions...
March 13, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28285091/identification-of-anfo-use-of-luminescent-taggants-in-post-blast-residues
#7
F G M Mauricio, A Z Pralon, M Talhavini, M O Rodrigues, I T Weber
This work describes the incorporation of luminescent taggants in cartridges of ammonium nitrate-fuel oil (ANFO) to allow easy identification and collection of post-blast residues. Metal-Organic Frameworks taggants proved to be appropriate for explosive marking when ANFO proportions were above 3.0wt.%. Lanthanide-based light emission enabled in situ retrieval of explosive residues as well as chemical identification, allowing the creation of a coding system using Energy Dispersive Spectroscopy (EDS). The proposed method will accelerate laboratory analysis and support forensic investigations, connecting evidence to suspects and/or to the explosive origin...
March 6, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28281922/a-high-performance-non-radioactive-potency-assay-for-measuring-cytotoxicity-a-full-substitute-of-the-chromium-release-assay-targeting-the-regulatory-compliance-objective
#8
Alexis Rossignol, Véronique Bonnaudet, Béatrice Clémenceau, Henri Vié, Laurent Bretaudeau
Standardized and biologically relevant potency assays are required by the regulatory authorities for the characterization and quality control of therapeutic antibodies. As critical mechanisms of action (MoA) of antibodies, the antibody-dependent cell-meditated cytotoxicity (ADCC) and complement-dependent cytotoxicity (CDC) must be characterized by appropriate potency assays. The current reference method for measuring cytotoxicity is the (51)Cr-release method. However, radioactivity handling is difficult to implement in an industrial context because of environmental and operator protection constraints...
February 8, 2017: MAbs
https://www.readbyqxmd.com/read/28280778/two-way-chemical-communication-between-artificial-and-natural-cells
#9
Roberta Lentini, Noël Yeh Martín, Michele Forlin, Luca Belmonte, Jason Fontana, Michele Cornella, Laura Martini, Sabrina Tamburini, William E Bentley, Olivier Jousson, Sheref S Mansy
Artificial cells capable of both sensing and sending chemical messages to bacteria have yet to be built. Here we show that artificial cells that are able to sense and synthesize quorum signaling molecules can chemically communicate with V. fischeri, V. harveyi, E. coli, and P. aeruginosa. Activity was assessed by fluorescence, luminescence, RT-qPCR, and RNA-seq. Two potential applications for this technology were demonstrated. First, the extent to which artificial cells could imitate natural cells was quantified by a type of cellular Turing test...
February 22, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28276248/borazino-doped-polyphenylenes
#10
Davide Marinelli, Francesco Fasano, Btissam Najjari, Nicola Demitri, Davide Bonifazi
The divergent synthesis of two series of borazino-doped polyphenylenes, in which one or more aryl units are replaced by borazine rings, is reported for the first time taking advantage of the decarbonylative [4+2] Diels-Alder cycloaddition reaction between ethynyl and tetraphenylcyclopentadienone derivatives. Owing to the possibility of functionalizing the borazine core with different groups on the aryl substituents at the N and B atoms of the borazino core, we have prepared borazino-doped polyphenylenes featuring different doping dosages and orientations...
March 9, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28259190/recent-advances-in-understanding-delayed-photoluminescence-in-colloidal-semiconductor-nanocrystals
#11
Arianna Marchioro
Colloidal semiconductor nanocrystals display remarkably bright, strongly size-dependent photoluminescence properties. Following photoexcitation of these materials, temporary charge carrier separation can occur where one or both charge carriers are trapped. Charge detrapping can reform the emissive state on long time scales up to seconds, causing delayed luminescence. This delayed luminescence has not yet been thoroughly explored, and appears to be closely associated with a phenomenon observed at the single particle level, i...
February 22, 2017: Chimia
https://www.readbyqxmd.com/read/28245406/-analysis-of-the-detection-results-of-the-syphilis-specific-antibody-in-blood-donors-by-chemiluminescence-method-and-enzyme-linked-immunosorbent-assay
#12
Shou-Shan Men, Fa-Kui Shang, Chun-Hua Han, Jin-Xiang Song, Jing-Yin Han
OBJECTIVE: To investigate the application value of chemiluminescence method (CMIA) detection of Treponema pallidum (TP) specific antibodies in the blood test. METHODS: Over the same period the de novo enzyme linked immunosorbent assay (ELISA) and Abbott chemical luminescence method were used to detect the specific antibody of syphilis in a total of 66298 samples; TP-ELISA negative and TP-CMIA positive unpaid blood donation blood samples for syphilis specific antibody were detected and confirmed by Western blot...
February 2017: Zhongguo Shi Yan Xue Ye Xue za Zhi
https://www.readbyqxmd.com/read/28243089/using-cdte-znse-core-shell-quantum-dots-to-detect-dna-and-damage-to-dna
#13
Amitava Moulick, Vedran Milosavljevic, Jana Vlachova, Robert Podgajny, David Hynek, Pavel Kopel, Vojtech Adam
CdTe/ZnSe core/shell quantum dot (QD), one of the strongest and most highly luminescent nanoparticles, was directly synthesized in an aqueous medium to study its individual interactions with important nucleobases (adenine, guanine, cytosine, and thymine) in detail. The results obtained from the optical analyses indicated that the interactions of the QDs with different nucleobases were different, which reflected in different fluorescent emission maxima and intensities. The difference in the interaction was found due to the different chemical behavior and different sizes of the formed nanoconjugates...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28231432/dismantling-the-red-wall-of-colloidal-perovskites-highly-luminescent-formamidinium-and-formamidinium-cesium-lead-iodide-nanocrystals
#14
Loredana Protesescu, Sergii Yakunin, Sudhir Kumar, Janine Bär, Federica Bertolotti, Norberto Masciocchi, Antonietta Guagliardi, Matthias Grotevent, Ivan Shorubalko, Maryna I Bodnarchuk, Chih-Jen Shih, Maksym V Kovalenko
Colloidal nanocrystals (NCs) of APbX3-type lead halide perovskites [A = Cs(+), CH3NH3(+) (methylammonium or MA(+)) or CH(NH2)2(+) (formamidinium or FA(+)); X = Cl(-), Br(-), I(-)] have recently emerged as highly versatile photonic sources for applications ranging from simple photoluminescence down-conversion (e.g., for display backlighting) to light-emitting diodes. From the perspective of spectral coverage, a formidable challenge facing the use of these materials is how to obtain stable emissions in the red and infrared spectral regions covered by the iodide-based compositions...
March 28, 2017: ACS Nano
https://www.readbyqxmd.com/read/28223076/leaching-of-rare-earth-elements-from-fluorescent-powder-using-the-tea-fungus-kombucha
#15
Stefanie Hopfe, Katrin Flemming, Falk Lehmann, Robert Möckel, Sabine Kutschke, Katrin Pollmann
In most modern technologies such as flat screens, highly effective magnets and lasers, as well as luminescence phosphors, Rare Earth Elements (REE) are used. Unfortunately no environmentally friendly recycling process exists so far. In comparison to other elements the interaction of microorganisms with REE has been studied to a less extent. However, as REE are ubiquitously present in nature it can be assumed that microorganisms play an important role in the biogeochemistry of REE. This study investigates the potential of organic acid-producing microbes for extracting REE from industrial waste...
February 17, 2017: Waste Management
https://www.readbyqxmd.com/read/28215085/peptide-functionalized-gold-nanoparticles-as-a-stimuli-responsive-contrast-medium-in-multiphoton-microscopy
#16
Johan Borglin, Robert Selegård, Daniel Aili, Marica B Ericson
There is a need for biochemical contrast mediators with high signal-to-noise ratios enabling noninvasive biomedical sensing, for example, for neural sensing and protein-protein interactions, in addition to cancer diagnostics. The translational challenge is to develop a biocompatible approach ensuring high biochemical contrast while avoiding a raise of the background signal. We here present a concept where gold nanoparticles (AuNPs) can be utilized as a stimuli responsive contrast medium by chemically triggering their ability to exhibit multiphoton-induced luminescence (MIL) when performing multiphoton laser scanning microscopy (MPM)...
March 8, 2017: Nano Letters
https://www.readbyqxmd.com/read/28208291/growth-based-bacterial-viability-assay-for-interference-free-and-high-throughput-toxicity-screening-of-nanomaterials
#17
Tian A Qiu, Thu Ha Thi Nguyen, Natalie V Hudson-Smith, Peter L Clement, Dona-Carla Forester, Hilena Frew, Mimi N Hang, Catherine J Murphy, Robert J Hamers, Z Vivian Feng, Christy L Haynes
Current high-throughput approaches evaluating toxicity of chemical agents toward bacteria typically rely on optical assays, such as luminescence and absorbance, to probe the viability of the bacteria. However, when applied to toxicity induced by nanomaterials, scattering and absorbance from the nanomaterials act as interferences that complicate quantitative analysis. Herein, we describe a bacterial viability assay that is free of optical interference from nanomaterials and can be performed in a high-throughput format on 96-well plates...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28207248/mechanochemical-and-conventional-synthesis-of-zn-ii-cd-ii-luminescent-coordination-polymers-dual-sensing-probe-for-selective-detection-of-chromate-anions-and-tnp-in-aqueous-phase
#18
Bhavesh Parmar, Yadagiri Rachuri, Kamal Kumar Bisht, Ridhdhi Laiya, Eringathodi Suresh
Isostructural Zn(II)/Cd(II) mixed ligand coordination polymers (CPs) {[M(IPA)(L)]}n (CP1 and CP2) built from isophthalic acid (H2IPA) and 3-pyridylcarboxaldehyde nicotinoylhydrazone (L) were prepared using versatile synthetic routes: viz., diffusion of precursor solutions, conventional reflux methods, and green mechanochemical (grinding) reactions. Both robust CPs synthesized by different routes were characterized by various analytical methods, and their thermal and chemical stability as well as the phase purity was established...
February 16, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28197587/modeling-excitation-energy-transfer-in-multi-bodipy-architectures
#19
Cloé Azarias, Roberto Russo, Lorenzo Cupellini, Benedetta Mennucci, Denis Jacquemin
The excitation energy transfer (EET) allowing the concentration of the energy has been investigated in several multi-BODIPY architectures with the help of an approach coupling time dependent density functional theory to an implicit solvation scheme, the polarizable continuum model. We have first considered several strategies to compute the electronic coupling in a dyad varying the size of the donor/acceptor units, the bridge, the geometries and conformations. We have next studied the electronic coupling in three different architectures for which the EET rate constants have been experimentally measured both from luminescence and transient absorption data and from Förster theory...
February 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28194955/luminometric-label-array-for-counting-and-differentiation-of-bacteria
#20
Milla Högmander, Catherine J Paul, Sandy Chan, Elina Hokkanen, Ville Eskonen, Tapio Pahikkala, Sari Pihlasalo
Methods for simple and fast detection and differentiation of bacterial species are required, for instance, in medicine, water quality monitoring, and the food industry. Here, we have developed a novel label array method for the counting and differentiation of bacterial species. This method is based on the nonspecific interactions of multiple unstable lanthanide chelates and selected chemicals within the sample leading to a luminescence signal profile that is unique to the bacterial species. It is simple, cost-effective, and/or user-friendly compared to many existing methods, such as plate counts on selective media, automatic (hemocytometer-based) cell counters, flow cytometry, and polymerase chain reaction (PCR)-based methods for identification...
February 20, 2017: Analytical Chemistry
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