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https://www.readbyqxmd.com/read/29205732/azophenine-as-central-core-for-efficient-light-harvesting-devices
#1
Pierre D Harvey, Hu Lei, Paul-Ludovic Karsenti
The notoriously non-luminescent uncycled azophenine (Q) was harnessed with Bodipy and zinc(II)porphyrin antennas to probe its fluorescence properties, its ability to act as a singlet excited state energy acceptor and to mediate the transfer. Two near-IR emissions are depicted from time-resolved fluorescence spectroscopy, which are most likely due to the presence of tautomers of very similar calculated total energies (350 cm-1; DFT; B3LYP). The rates for energy transfer, kET(S1), for 1Bodipy*→Q are in the order of 1010-1011 s-1 and are surprisingly fast when considering the low absorptivity properties of the lowest energy charge transfer excited state of azophenine...
December 3, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/29139597/time-resolved-interception-of-multiple-charge-accumulation-in-a-sensitizer-acceptor-dyad
#2
Stéphanie Mendes Marinho, Minh-Huong Ha-Thi, Van-Thai Pham, Annamaria Quaranta, Thomas Pino, Christophe Lefumeux, Thierry Chamaillé, Winfried Leibl, Ally Aukauloo
Biomimetic models that contain elements of photosynthesis are fundamental in the development of synthetic systems that can use sunlight to produce fuel. The critical task consists of running several rounds of light-induced charge separation, which is required to accumulate enough redox equivalents at the catalytic sites for the target chemistry to occur. Long-lived first charge-separated state and distinct electronic signatures for the sequential charge accumulated species are essential features to be able to track these events on a spectroscopic ground...
November 15, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29126473/a-luminescent-probe-of-mismatched-dna-hybridization-location-and-number-of-mismatches
#3
Amira F El-Yazbi, Alysha Wong, Glen R Loppnow
The human genome is susceptible to change; base mismatches can arise from damaged DNA, replication errors, and spontaneous mutation, and have the potential to cause apoptosis, carcinogenesis, and mutagenesis. Many techniques have been developed for DNA mismatch detection, but many of these methods have complex, time-consuming procedures and are limited to the detection of specific types of DNA mismatches. In this work, we present a general method for the simple and sensitive nucleobase-sensitized luminescent detection of mismatches in double-stranded DNA (dsDNA) using terbium ions...
November 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29072834/light-regulated-synthesis-of-cyclic-di-gmp-by-a-bidomain-construct-of-the-cyanobacteriochrome-tlr0924-sesa-without-stable-dimerization
#4
Matthew Blain-Hartung, Nathan C Rockwell, J Clark Lagarias
Phytochromes and cyanobacteriochromes (CBCRs) use double-bond photoisomerization of their linear tetrapyrrole (bilin) chromophores within cGMP-specific phosphodiesterases/adenylyl cyclases/FhlA (GAF) domain-containing photosensory modules to regulate activity of C-terminal output domains. CBCRs exhibit photocycles that are much more diverse than those of phytochromes and are often found in large modular proteins such as Tlr0924 (SesA), one of three blue light regulators of cell aggregation in the cyanobacterium Thermosynechococcus elongatus...
November 8, 2017: Biochemistry
https://www.readbyqxmd.com/read/29057146/light-scattering-spectroscopy-identifies-the-malignant-potential-of-pancreatic-cysts-during-endoscopy
#5
Lei Zhang, Douglas K Pleskow, Vladimir Turzhitsky, Eric U Yee, Tyler M Berzin, Mandeep Sawhney, Shweta Shinagare, Edward Vitkin, Yuri Zakharov, Umar Khan, Fen Wang, Jeffrey D Goldsmith, Saveli Goldberg, Ram Chuttani, Irving Itzkan, Le Qiu, Lev T Perelman
Pancreatic cancers are usually detected at an advanced stage and have poor prognosis. About one fifth of these arise from pancreatic cystic lesions. Yet not all lesions are precancerous, and imaging tools lack adequate accuracy for distinguishing precancerous from benign cysts. Therefore, decisions on surgical resection usually rely on endoscopic ultrasound-guided fine needle aspiration (EUS-FNA). Unfortunately, cyst fluid often contains few cells, and fluid chemical analysis lacks accuracy, resulting in dire consequences, including unnecessary pancreatic surgery for benign cysts and the development of cancer...
2017: Nature Biomedical Engineering
https://www.readbyqxmd.com/read/29041360/surface-topography-acquisition-method-for-double-sided-near-right-angle-structured-surfaces-based-on-dual-probe-wavelength-scanning-interferometry
#6
Tao Zhang, Feng Gao, Xiangqian Jiang
This paper proposes an approach to measure double-sided near-right-angle structured surfaces based on dual-probe wavelength scanning interferometry (DPWSI). The principle and mathematical model is discussed and the measurement system is calibrated with a combination of standard step-height samples for both probes vertical calibrations and a specially designed calibration artefact for building up the space coordinate relationship of the dual-probe measurement system. The topography of the specially designed artefact is acquired by combining the measurement results with white light scanning interferometer (WLSI) and scanning electron microscope (SEM) for reference...
October 2, 2017: Optics Express
https://www.readbyqxmd.com/read/28966348/x-rays-from-the-location-of-the-double-humped-transient-asassn-15lh
#7
R Margutti, B D Metzger, R Chornock, D Milisavljevic, E Berger, P K Blanchard, C Guidorzi, G Migliori, A Kamble, R Lunnan, M Nicholl, D L Coppejans, S Dall'Osso, M R Drout, R Perna, B Sbarufatti
We present the detection of persistent soft X-ray radiation with Lx ~ 10(41)-10(42) erg s(-1) at the location of the extremely luminous, double-humped transient ASASSN-15lh as revealed by Chandra and Swift. We interpret this finding in the context of observations from our multiwavelength campaign, which revealed the presence of weak narrow nebular emission features from the host-galaxy nucleus and clear differences with respect to superluminous supernova optical spectra. Significant UV flux variability on short timescales detected at the time of the rebrightening disfavors the shock interaction scenario as the source of energy powering the long-lived UV emission, while deep radio limits exclude the presence of relativistic jets propagating into a low-density environment...
February 10, 2017: Astrophysical Journal
https://www.readbyqxmd.com/read/28963605/sensitive-electrochemical-detection-of-dna-damage-based-on-in-situ-double-strand-growth-via-hybridization-chain-reaction
#8
Misha Liu, Jinjin Xu, Fan Yang, Yifan Gu, Huan Chen, Ying Wang, Fengting Li
Detection of DNA damage caused by ∙OH or radiation has led to rapidly growing interest in the fields of drug development, biochemistry, clinic diagnostics, and environmental evaluation. Electrochemical methods have been applied for DNA damage detection because of their fast and sensitive response. However, most of the electrochemical methods for DNA damage detection commonly require immobilization of the strands on the electrode surface. In the present work, sensitive electrochemical monitoring of DNA damage was realized successfully on the basis of in situ DNA chain growth by use of a hybridization chain reaction (HCR) technique...
September 29, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28949137/selective-excitation-of-cyanophenylalanine-fluorophores-for-multi-site-binding-studies
#9
Natalie R Fetto, Wenqiang Cao, Ian S Wallace, Matthew J Tucker
Recently, it has been shown that nitrile-derivatized phenylalanines possess distinct fluorescent properties depending on the position of the cyano-group within the aromatic ring. These fluorophores have potential as probes for studying protein dynamics due to their sensitivity to local environment. Herein, we demonstrate that 2-cyanophenylalanine (Phe2CN) and Phe4CN can independently monitor multiple sites during the Ca(2+) dependent binding of a skeletal muscle myosin light chain kinase (MLCK) peptide fragment to the protein calmodulin (CaM)...
October 6, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28936657/whole-mount-rna-fish-on-ovules-and-developing-seeds
#10
Andrea Bleckmann, Thomas Dresselhaus
A key element to understand developmental and reproductive processes like germline development, double fertilization, and embryogenesis is the study of cell-specific gene expression patterns which is best analyzed by RNA in situ hybridization. Different visualization techniques have been established to mark either the region of mRNA production (using the classical chromogenic detection system) or the specific localization of mRNAs (using fluorescent labeled probes). In this chapter, we describe and compare whole mount RNA in situ hybridization techniques on ovules and young developing seeds from Arabidopsis thaliana using three different detection systems...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28924230/two-step-excitation-in-hot-atomic-sodium-vapor
#11
Bernd Docters, Jörg Wrachtrup, Ilja Gerhardt
A two step excitation scheme in hot atomic sodium vapor is experimentally investigated. The observed effects reflect a coupling between the 3(2)S, 3(2)P and the 3(2)D states. We present the relative dependence on detuning of the two utilized lasers around λ = 589 nm and 819 nm. Unlike expected, we achieve a higher detuning dependence of the probe and the coupling laser by a factor of approximately three. The presented work aimed for a Rydberg excitation and quantum light storage. Such schemes are usually implemented with a red laser on the D-line transition and a coupling laser of shorter (typically blue) wavelength...
September 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28920423/self-organization-of-ions-at-the-interface-between-graphene-and-ionic-liquid-deme-tfsi
#12
Guangliang Hu, Gaind P Pandey, Qingfeng Liu, Radhika S Anaredy, Chunrui Ma, Ming Liu, Jun Li, Scott K Shaw, Judy Wu
Electrochemical effects manifest as nonlinear responses to an applied electric field in electrochemical devices, and are linked intimately to the molecular orientation of ions in the electric double layer (EDL). Herein, we probe the origin of the electrochemical effect using a double-gate graphene field effect transistor (GFET) of ionic liquid N,N-diethyl-N-(2-methoxyethyl)-N-methylammonium bis(trifluoromethylsulfonyl)imide (DEME-TFSI) top-gate, paired with a ferroelectric Pb0.92La0.08Zr0.52Ti0.48O3 (PLZT) back-gate of compatible gating efficiency...
October 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28877115/quantitation-of-24-hour-moisturization-by-electrical-measurements-of-skin-hydration
#13
RANDOMIZED CONTROLLED TRIAL
R Randall Wickett, Bronson Damjanovic
PURPOSE: The purpose of this study was to quantify the effects of several moisturizers on hydration of the stratum corneum by measuring their effect on electrical conductance over a 24-hour period. DESIGN: Double-blind, randomized controlled trial. SUBJECTS AND SETTING: Twenty-five healthy female volunteers aged 18 to 65 years with dry skin on the lower legs and no other known dermatologic pathology participated in the study. Additional exclusion criteria were pregnant or taking anti-inflammatory steroids...
September 2017: Journal of Wound, Ostomy, and Continence Nursing
https://www.readbyqxmd.com/read/28864184/reduced-graphene-oxide-as-a-resonance-light-scattering-probe-for-thrombin-detection-using-dual-aptamer-based-dsdna
#14
Feng Chen, Yi Liu, Rong Liao, Hang Gong, Chunyan Chen, Xiaoming Chen, Changqun Cai
This paper describes a reduced graphene oxide (RGO)-based resonance light-scattering (RLS) method for thrombin detection by using double strand DNA (dsDNA) as a binding element. dsDNA is obtained by hybridizing DNA1 and DNA2, which respectively consist of one aptamer of thrombin and the complementary strand of the other aptamer of thrombin. When thrombin is added, the specific binding of two aptamers to thrombin results in a complex (DNA1-thrombin-DNA2) and triggers the release of the complementary strand of two aptamers from dsDNA...
September 8, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28725027/strong-coherent-light-amplification-with-double-electromagnetically-induced-transparency-coherences
#15
Dan Wang, Chao Liu, Changshun Xiao, Junxiang Zhang, Hessa M M Alotaibi, Barry C Sanders, Li-Gang Wang, Shiyao Zhu
We experimentally demonstrate coherent amplification of probe field in a tripod-type atoms driven by strong coupling, signal and weak probe fields. We suppress linear and nonlinear atomic absorptions for resonant and near resonant probe via double electromagnetically induced transparency (DEIT). Combining these advantages of suppressed absorption along with temperature- or atomic-density-controlled transfer of population(ToP) between hyperfine ground states, we can induce near-resonant amplification of probe through stimulated Raman scattering(SRS) pumped by low-intensity signal field...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28706354/intensities-of-incident-and-transmitted-ultraviolet-a-rays-through-gafchromic-films
#16
Toshizo Katsuda, Rumi Gotanda, Tatsuhiro Gotanda, Takuya Akagawa, Nobuyoshi Tanki, Tadao Kuwano, Atsushi Noguchi, Kouichi Yabunaka
Gafchromic films have been applied to X-ray dosimetry in diagnostic radiology. To correct nonuniformity errors in Gafchromic films, X-rays in the double-exposure technique can be replaced with ultraviolet (UV)-A rays. Intensities of the incident and transmitted UV-A rays were measured. However, it is unclear whether the chemical color change of Gafchromic films affects the UV-A transmission intensity. Gafchromic EBT3 films were suitable to be used in this study because non-UV protection layers are present on both sides of the film...
April 2017: Journal of Medical Physics
https://www.readbyqxmd.com/read/28700536/fully-implantable-battery-free-wireless-optoelectronic-devices-for-spinal-optogenetics
#17
Vijay K Samineni, Jangyeol Yoon, Kaitlyn E Crawford, Yu Ra Jeong, Kajanna C McKenzie, Gunchul Shin, Zhaoqian Xie, Saranya S Sundaram, Yuhang Li, Min Young Yang, Jeonghyun Kim, Di Wu, Yeguang Xue, Xue Feng, Yonggang Huang, Aaron D Mickle, Anthony Banks, Jeong Sook Ha, Judith P Golden, John A Rogers, Robert W Gereau
The advent of optogenetic tools has allowed unprecedented insights into the organization of neuronal networks. Although recently developed technologies have enabled implementation of optogenetics for studies of brain function in freely moving, untethered animals, wireless powering and device durability pose challenges in studies of spinal cord circuits where dynamic, multidimensional motions against hard and soft surrounding tissues can lead to device degradation. We demonstrate here a fully implantable optoelectronic device powered by near-field wireless communication technology, with a thin and flexible open architecture that provides excellent mechanical durability, robust sealing against biofluid penetration and fidelity in wireless activation, thereby allowing for long-term optical stimulation of the spinal cord without constraint on the natural behaviors of the animals...
November 2017: Pain
https://www.readbyqxmd.com/read/28668731/determination-of-thorium-iv-using-isophthalaldehyde-tetrapyrrole-as-probe-by-resonance-light-scattering-second-order-scattering-and-frequency-doubling-scattering-spectra
#18
Jiao Wang, Jinhua Xue, Xilin Xiao, Li Xu, Min Jiang, Pengcheng Peng, Lifu Liao
The coordination reaction of thorium (IV) with a ditopic bidentate ligand to form supramolecular polymer was studied by resonance light scattering (RLS) spectra, second-order scattering (SOS) spectra and frequency-doubling scattering (FDS) spectra, respectively. The ditopic bidentate ligand is isophthalaldehyde-tetrapyrrole (IPTP). It was synthesized through a condensation reaction of isophthalaldehyde with pyrrole. The formation of supramolecular polymer results in remarkable intensity enhancements of the three light scattering signals...
June 27, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28579916/kilonovae
#19
REVIEW
Brian D Metzger
The mergers of double neutron star (NS-NS) and black hole (BH)-NS binaries are promising gravitational wave (GW) sources for Advanced LIGO and future GW detectors. The neutron-rich ejecta from such merger events undergoes rapid neutron capture (r-process) nucleosynthesis, enriching our Galaxy with rare heavy elements like gold and platinum. The radioactive decay of these unstable nuclei also powers a rapidly evolving, supernova-like transient known as a "kilonova" (also known as "macronova"). Kilonovae are an approximately isotropic electromagnetic counterpart to the GW signal, which also provides a unique and direct probe of an important, if not dominant, r-process site...
2017: Living Reviews in Relativity
https://www.readbyqxmd.com/read/28524354/an-aggregating-amphiphilic-squaraine-a-light-up-probe-that-discriminates-parallel-g-quadruplexes
#20
Vincenzo Grande, Filippo Doria, Mauro Freccero, Frank Würthner
G-quadruplexes (G4s) are peculiar DNA or RNA tertiary structures that are involved in the regulation of many biological events within mammalian cells, bacteria, and viruses. Although their role as versatile therapeutic targets has been emphasized for 35 years, G4 selectivity over ubiquitous double-stranded DNA/RNA, as well as G4 differentiation by small molecules, still remains challenging. Here, a new amphiphilic dicyanovinyl-substituted squaraine, SQgl, is reported to act as an NIR fluorescent light-up probe discriminating an extensive panel of parallel G4s while it is non-fluorescent in the aggregated state...
May 19, 2017: Angewandte Chemie
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