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https://www.readbyqxmd.com/read/28935962/excitation-of-coupled-spin-orbit-dynamics-in-cobalt-oxide-by-femtosecond-laser-pulses
#1
Takuya Satoh, Ryugo Iida, Takuya Higuchi, Yasuhiro Fujii, Akitoshi Koreeda, Hiroaki Ueda, Tsutomu Shimura, Kazuo Kuroda, V I Butrim, B A Ivanov
Ultrafast control of magnets using femtosecond light pulses attracts interest regarding applications and fundamental physics of magnetism. Antiferromagnets are promising materials with magnon frequencies extending into the terahertz range. Visible or near-infrared light interacts mainly with the electronic orbital angular momentum. In many magnets, however, in particular with iron-group ions, the orbital momentum is almost quenched by the crystal field. Thus, the interaction of magnons with light is hampered, because it is only mediated by weak unquenching of the orbital momentum by spin-orbit interactions...
September 21, 2017: Nature Communications
https://www.readbyqxmd.com/read/28935419/red-near-infrared-light-stimulates-release-of-an-endothelium-dependent-vasodilator-and-rescues-vascular-dysfunction-in-a-diabetes-model
#2
Agnes Keszler, Brian Lindemer, Dorothee Weihrauch, Deron Jones, Neil Hogg, Nicole L Lohr
Peripheral artery disease (PAD) is a morbid condition whereby ischemic peripheral muscle causes pain and tissue breakdown. Interestingly, PAD risk factors, e.g. diabetes mellitus, cause endothelial dysfunction secondary to decreased nitric oxide (NO) levels, which could explain treatment failures. Previously, we demonstrated 670nm light (R/NIR) increased NO from nitrosyl-heme stores, therefore we hypothesized R/NIR can stimulate vasodilation in healthy and diabetic blood vessels. Vasodilation was tested by ex vivo pressure myography in wild type C57Bl/6, endothelial nitric oxide synthase (eNOS) knockout, and db/db mice (10mW/cm(2) for 5min with 10min dark period)...
September 18, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28934117/new-zno-cardanol-porphyrin-composite-nanomaterials-with-enhanced-photocatalytic-capability-under-solar-light-irradiation
#3
Viviane Gomes Pereira Ribeiro, Ana Maria Pereira Marcelo, Kássia Teixeira da Silva, Fernando Luiz Firmino da Silva, João Paulo Ferreira Mota, João Paulo Costa do Nascimento, Antonio Sérgio Bezerra Sombra, Claudenilson da Silva Clemente, Giuseppe Mele, Luigi Carbone, Selma Elaine Mazzetto
This work describes the synthesis, characterization, and photocatalytic activity of new composite nanomaterials based on ZnO nanostructures impregnated by lipophlilic porphyrins derived from cashew nut shell liquid (CNSL). The obtained nanomaterials were characterized by X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), and steady-state photoluminescence spectra (PL). The results confirm nanostructures showing average diameter of 55 nm and an improved absorption in the visible region...
September 21, 2017: Materials
https://www.readbyqxmd.com/read/28933685/adsorption-of-re-3-from-aqueous-solutions-by-bayberry-tannin-immobilized-on-chitosan
#4
Xianying Qiu, Yueyue Shen, Ruilin Yang, Hongcheng Zhang, Shilin Zhao
Bayberry tannin immobilized on chitosan (CS-BT) was successfully prepared, and its adsorption performance was studied for aqueous solutions of rare earth ions. The as-prepared absorbents were characterized by Fourier transform infrared spectrometry and scanning electron microscopy. The equilibrium adsorption capacity was achieved in approximately 30 min. The adsorption process of CS-BT for Nd(3+) ion was well fitted with a Freundlich model. Sorption of Nd(3+) onto CS-BT could be well described by the pseudo second-order kinetics...
September 21, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28933200/infrared-extinction-performance-of-randomly-oriented-microbial-clustered-agglomerate-materials
#5
Le Li, Yihua Hu, Youlin Gu, Xinying Zhao, Shilong Xu, Lei Yu, Zhi Ming Zheng, Peng Wang
In this study, the spatial structure of randomly distributed clusters of fungi An0429 spores was simulated using a cluster aggregation (CCA) model, and the single scattering parameters of fungi An0429 spores were calculated using the discrete dipole approximation (DDA) method. The transmittance of 10.6 µm infrared (IR) light in the aggregated fungi An0429 spores swarm is simulated by using the Monte Carlo method. Several parameters that affect the transmittance of 10.6 µm IR light, such as the number and radius of original fungi An0429 spores, porosity of aggregated fungi An0429 spores, and density of aggregated fungi An0429 spores of the formation aerosol area were discussed...
January 1, 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28933069/optical-tomographic-imaging-for-breast-cancer-detection
#6
Wenxiang Cong, Xavier Intes, Ge Wang
Diffuse optical breast imaging utilizes near-infrared (NIR) light propagation through tissues to assess the optical properties of tissues for the identification of abnormal tissue. This optical imaging approach is sensitive, cost-effective, and does not involve any ionizing radiation. However, the image reconstruction of diffuse optical tomography (DOT) is a nonlinear inverse problem and suffers from severe illposedness due to data noise, NIR light scattering, and measurement incompleteness. An image reconstruction method is proposed for the detection of breast cancer...
September 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28931815/silicon-single-photon-avalanche-diodes-with-nano-structured-light-trapping
#7
Kai Zang, Xiao Jiang, Yijie Huo, Xun Ding, Matthew Morea, Xiaochi Chen, Ching-Ying Lu, Jian Ma, Ming Zhou, Zhenyang Xia, Zongfu Yu, Theodore I Kamins, Qiang Zhang, James S Harris
Silicon single-photon avalanche detectors are becoming increasingly significant in research and in practical applications due to their high signal-to-noise ratio, complementary metal oxide semiconductor compatibility, room temperature operation, and cost-effectiveness. However, there is a trade-off in current silicon single-photon avalanche detectors, especially in the near infrared regime. Thick-junction devices have decent photon detection efficiency but poor timing jitter, while thin-junction devices have good timing jitter but poor efficiency...
September 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/28930435/new-triplet-sensitization-routes-for-photon-upconversion-thermally-activated-delayed-fluorescence-molecules-inorganic-nanocrystals-and-singlet-to-triplet-absorption
#8
Nobuhiro Yanai, Nobuo Kimizuka
Photon upconversion based on triplet-triplet annihilation (TTA-UC) has attracted much interest because of its possible applications to renewable energy production and biological fields. In particular, the UC of near-infrared (NIR) light to visible (vis) light is imperative to overcome the Shockley-Queisser limit of single-junction photovoltaic cells, and the efficiency of photocatalytic hydrogen production from water can also be improved with the aid of vis-to-ultraviolet (UV) UC. However, both processes have met limitations in the wavelength range, efficiency, and sensitivity for weak incident light...
September 20, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28930346/one-pot-solution-synthesis-of-shape-controlled-copper-selenide-nanostructures-and-their-potential-applications-in-photocatalysis-and-photothermal-therapy
#9
Xianwen Wang, Zhaohua Miao, Yan Ma, Huajian Chen, Haisheng Qian, Zhengbao Zha
Developing a facile and reliable method for the fabrication of transition metal chalcogenides is a vital and endless pursuit of scientific and technological disciplines. In this work, we develop a one-pot solution approach to obtain copper selenide nanostructures with different morphologies and crystal structures (Cu2Se nanoparticles, CuSe nanoplates and CuSe2 nanosheets). In comparison to previously reported methods, our method did not use expensive and very toxic raw materials. After detailed studies of reaction conditions, including temperature, reaction time, and feeding amount of surfactants and precursors, we found that the feeding ratio of precursors played a key role in the crystal structures and morphologies of the final products...
September 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28930099/optical-properties-of-graphene-nanocones-under-electric-and-magnetic-fields
#10
Pable Ulloa, Monica Pacheco, Andrea Latge
Here we present a theoretical study of the optical properties of graphene nanocones tuned by external electric and magnetic fields. We investigate the effects of the size and topology of the carbon nanostructures on the density of states and on the electro- and magneto-absorption of linearly polarized electromagnetic radiation in different nanocone geometries. We find that the electric field induces changes in the electric charge distribution mainly at the cone edges. In the infrared range the absorption coefficient shows a peculiar dependence on the electric field (magnitude and direction) and on the photon polarization for all investigated structures...
September 20, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28929754/spectro-electrochemical-examination-of-the-formation-of-dimethyl-carbonate-from-co-and-methanol-at-different-electrode-materials
#11
Marta C Figueiredo, Vinh Trieu, Stefanie Eiden, Marc T M Koper
In this work, we report a fundamental mechanistic study of the electrochemical oxidative carbonylation of methanol with CO for the synthesis of dimethyl carbonate on metallic electrodes at low overpotentials. For the first time, the reaction was shown to take place on the metallic catalysts without need of oxidized metals or additives. Moreover, in situ spectroelectrochemical techniques were applied to this electrosynthesis reaction in order to reveal the reaction intermediates and shed light into the reaction mechanism...
September 20, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28928892/the-targeted-antitumor-effects-of-c-pc-cmc-cd59sp-nanoparticles-on-hela-cells-in-vitro-and-in-vivo
#12
Yujuan Wang, Liangqian Jiang, Qifeng Yin, Huihui Liu, Guoxiang Liu, Guoteng Zhu, Bing Li
The novel C-PC/CMC-CD59sp-NPs were made by carbocymethyl chitosan (CMC) loading C-phycocyanin (C-PC) with the lead of CD59 specific ligand peptide (CD59sp) for targeting, and the characteristics and targeted anti-tumor mechanism were explored in order to realize the targeted therapy of C-PC on the growth of HeLa cells both in vitro and vivo. The targeting nanoparticles were synthesized by ionic-gelation method, and the optimal condition was selected out by orthogonal analysis. The properties of nanoparticles were observed by laser particle analyzer and dynamic light scattering (DLS) and Fourier Transform Infrared Spectrometer (FTIR)...
2017: Journal of Cancer
https://www.readbyqxmd.com/read/28928644/near-infrared-spectroscopy-based-frontal-lobe-neurofeedback-integrated-in-virtual-reality-modulates-brain-and-behavior-in-highly-impulsive-adults
#13
Justin Hudak, Friederike Blume, Thomas Dresler, Florian B Haeussinger, Tobias J Renner, Andreas J Fallgatter, Caterina Gawrilow, Ann-Christine Ehlis
Based on neurofeedback (NF) training as a neurocognitive treatment in attention-deficit/hyperactivity disorder (ADHD), we designed a randomized, controlled functional near-infrared spectroscopy (fNIRS) NF intervention embedded in an immersive virtual reality classroom in which participants learned to control overhead lighting with their dorsolateral prefrontal brain activation. We tested the efficacy of the intervention on healthy adults displaying high impulsivity as a sub-clinical population sharing common features with ADHD...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28926885/-evaluation-of-short-term-effect-of-intense-pulsed-light-combined-with-meibomian-gland-expression-in-the-treatment-of-meibomian-gland-dysfunction
#14
B Rong, P Tu, Y Tang, R X Liu, W J Song, X M Yan
Objective: To explore short-term effect of intense pulsed light (IPL) combined with meibomian gland expression in treating meibomian gland dysfunction (MGD). Methods: This study was a prospective, randomized, double-masked, controlled study. Forty-four MGD patients were enrolled in the study and received three consecutive IPL treatments with an interval of 4 weeks. One eye of each patient was randomly assigned as the study eye receiving the IPL therapy with an energy of 14-16 J/cm(2), and the fellow eye was as the control eye receiving a placebo therapy with 0 J/cm(2)...
September 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28926732/multifunctional-mesoporous-zro2-encapsulated-upconversion-nanoparticles-for-mild-nir-light-activated-synergistic-cancer-therapy
#15
Lili Feng, Shili Gai, Fei He, Yunlu Dai, Chongna Zhong, Piaoping Yang, Jun Lin
Desirable nanosystem that could not only deliver drugs safely and effectively into tumor sites, but also be expected to serve as photosensitizer to realize the photodynamic therapeutic function, would be of great significance in the synergistic cancer therapy. To perform this task, a multifunctional nanosystem has been developed for markedly enhanced cancer therapeutic efficacy by loading chemotherapy agent (doxorubicin hydrochloride, DOX) and photosensitive drug chlorin e6 (Ce6) into the channels of mesoporous zirconium dioxide (ZrO2) layer which coats on Nd(3+)-doped upconversion nanoparticles (UCNPs)...
September 13, 2017: Biomaterials
https://www.readbyqxmd.com/read/28924567/rearrangeable-and-exchangeable-optical-module-with-system-on-chip-for-wearable-functional-near-infrared-spectroscopy-system
#16
Tsukasa Funane, Takashi Numata, Hiroki Sato, Shinsuke Hiraizumi, Yuichi Hasegawa, Hidenobu Kuwabara, Kiyoshi Hasegawa, Masashi Kiguchi
We developed a system-on-chip (SoC)-incorporated light-emitting diode (LED) and avalanche photodiode (APD) modules to improve the usability and flexibility of a fiberless wearable functional near-infrared spectroscopy (fNIRS) system. The SoC has a microprocessing unit and programmable circuits. The time division method and the lock-in method were used for separately detecting signals from different positions and signals of different wavelengths, respectively. Each module autonomously works for this time-divided-lock-in measurement with a high sensitivity for haired regions...
January 2018: Neurophotonics
https://www.readbyqxmd.com/read/28923838/syngeneic-mouse-models-of-oral-cancer-are-effectively-targeted-by-anti-cd44-based-nir-pit
#17
Tadanobu Nagaya, Yuko Nakamura, Shuhei Okuyama, Fusa Ogata, Yasuhiro Maruoka, Peter L Choyke, Clint Alen, Hisataka Kobayashi
Oral cavity squamous cell carcinoma (OSCC) is considered one of the most aggressive subtypes of cancer. Anti-CD44 monoclonal antibodies (mAbs) are a potential therapy against CD44 expressing OSCC, however, to date the therapeutic effects have been disappointing. Here, a new cancer treatment is described, near-infrared photoimmunotherapy (NIR-PIT), that uses anti-CD44 mAbs conjugated to the photoabsorber, IR700DX. This conjugate is injected into mice harboring one of three CD44 expressing syngeneic murine oral cancer cell (MOC) lines, MOC1 (immunogenic), MOC2 mKate2 (moderately immunogenic), and MOC2-luc (poorly immunogenic)...
September 18, 2017: Molecular Cancer Research: MCR
https://www.readbyqxmd.com/read/28922637/optical-activity-of-co-porphyrin-in-the-light-of-ir-and-raman-spectroscopy-a-critical-dft-investigation
#18
Debesh R Roy, Esha V Shah, Sutapa Mondal Roy
A critical investigation on the structure, electronic properties and optical activities of a series of transition metal doped porphyrins (TMP; TM=Fe, Co, Ni) in the light of infrared and Raman spectroscopy is performed, under density functional formalism. The structure and electronic properties are studied in terms of ionization potential, electron affinity, chemical hardness (η), binding energies of the transition metals (BETM) etc. The origin of the optical activities, especially the visibly active cobalt porphyrin is addressed through critical study on their infrared and Raman spectra...
September 15, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28922635/fucoidan-coated-ciprofloxacin-loaded-chitosan-nanoparticles-for-the-treatment-of-intracellular-and-biofilm-infections-of-salmonella
#19
Elbi S, Nimal T R, Rajan V K, Gaurav Baranwal, Raja Biswas, Jayakumar R, Sathianarayanan S
Salmonella infections and their gallstone associated biofilm infections are difficult to treat due to poor penetration of antibiotics into the intracellular compartments of macrophages and within biofilms. Here we developed ciprofloxacin loaded chitosan nanoparticles (cCNPs) and fucoidan (Fu) coated cCNPs (Fu-cCNPs). Characterizations of these nanoparticles were carried out using Dynamic Light Scattering‎, Transmission electron microscopy and Fourier transform infrared spectroscopy. The prepared cCNPs and Fu-cCNPs have the size range of 124±7nm and 320±18nm, respectively...
September 5, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28921953/new-antimony-selenide-nickel-oxide-photocathode-boosts-the-efficiency-of-graphene-quantum-dots-co-sensitized-solar-cell
#20
Ankita Kolay, Ramesh K Kokal, Ankarao Kalluri, Isaac Macwan, Prabir K Patra, Partha Ghosal, Melepurath Deepa
A novel assembly of a photocathode and photoanode is investigated to explore their complementary effects in enhancing the photovoltaic performance of a quantum dot solar cell (QDSC). While p-type nickel oxide (NiO) has been used previously, antimony selenide (Sb2Se3) has not been used in a QDSC, especially as a component of a counter electrode (CE) architecture that doubles up as the photocathode. Here, near infrared (NIR) light absorbing Sb2Se3 nanoparticles (NPs) coated over electrodeposited NiO nanofibers on a carbon (C)-fabric substrate was employed as the highly efficient photocathode...
September 18, 2017: ACS Applied Materials & Interfaces
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