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https://www.readbyqxmd.com/read/28732334/does-laser-phototherapy-influence-the-proliferation-of-myoepithelial-cells-in-the-salivary-gland-of-hypothyroid-rats
#1
Virgínia Dias Uzêda-E-Silva, Tania Tavares Rodriguez, Luciana Maria Pedreira Ramalho, Flávia Calo Aquino Xavier, Isabele Cardoso Vieira de Castro, Antônio Luiz Barbosa Pinheiro, Jean Nunes Dos Santos
Thyroid hormones influence both development and growth of organs and tissues and guarantee metabolic demands that interfere with the quality of digestive secretions, including those of the salivary glands. Laser phototherapy - LPT can modulate various biological phenomena and its diverse effects permit the action on different cell types. The aim of this study was to evaluate the influence of laser phototherapy on myoepithelial cells of salivary glands of hypothyroid rats. Forty-two albino Wistar rats were divided into two main groups: euthyroid (EU) and hypothyroid (HYPO)...
July 12, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28732161/an-elegant-ph-responsive-nanovehicle-for-drug-delivery-based-on-triazine-dendrimer-modified-magnetic-nanoparticles
#2
Amir Landarani-Isfahani, Majid Moghadam, Shima Mohammadi, Maryam Royvaran, Naimeh Moshtael-Arani, Saghar Rezaei, Shahram Tangestaninejad, Valiollah Mirkhani, Iraj Mohammadpoor-Baltork
Owing to properties of magnetic nanoparticles and elegant three-dimensional macromolecule architectural features, dendrimeric structures have been investigated as nanoscale drug delivery systems. In this paper, a novel magnetic nanocarrier, generation two (G2) triazine dendrimer modified Fe3O4@SiO2 magnetic nanoparticles (MNP-G2), was designed, fabricated and characterized by Fourier transform infrared (FT-IR), thermal gravimetric analysis (TGA), vibrating sample magnetometer (VSM), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and dynamic light scattering (DLS)...
July 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28732157/large-scale-statistics-for-threshold-optimization-of-optically-pumped-nanowire-lasers
#3
Juan Arturo Alanis, Dhruv Saxena, Sudha Mokkapati, Nian Jiang, Kun Peng, Xiaoyan Tang, Lan Fu, Hark Hoe Tan, Chennupati Jagadish, Patrick Parkinson
Single nanowire lasers based on bottom-up III-V materials have been shown to exhibit room-temperature near-infrared lasing, making them highly promising for use as nanoscale, silicon-integrable and coherent light sources. While lasing behavior is reproducible, small variations in growth conditions across a substrate arising from the use of bottom-up growth techniques can introduce inter-wire disorder, either through geometric or material inhomogeneity. Nanolasers critically depend on both high material quality and tight dimensional tolerances, and as such, lasing threshold is both sensitive to, and a sensitive probe of such inhomogeneity...
July 21, 2017: Nano Letters
https://www.readbyqxmd.com/read/28731618/controlling-the-near-infrared-transparency-of-costal-cartilage-by-impregnation-with-clearing-agents-and-magnetite-nanoparticles
#4
Yulia Alexandrovskaya, Kirill Sadovnikov, Andrey Sharov, Anna Sherstneva, Evgeniy Evtushenko, Alexander Omelchenko, Mariya Obrezkova, Valery Tuchin, Valery Lunin, Emil Sobol
Penetration depth of near infrared laser radiation to costal cartilage is controlled by the tissue absorption and scattering and it is the critical parameter to provide the relaxation of mechanical stress throughout the whole thickness of cartilage implant. To enhance the penetration for the laser radiation on 1.56 μm the optical clearing solutions of glycerol and fructose of various concentrations are tested. The effective and reversible tissue clearance was achieved. However, the increasing absorption of radiation should be concerned: 5-8(ᴼ) C increase of tissue temperature was detected...
July 21, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28729560/adaptive-control-of-ion-yield-in-femtosecond-laser-post-ionization-for-secondary-ion-mass-spectrometry
#5
Dusan Lorenc, Monika Jerigova, Monika Stupavska, Dusan Velic
Secondary ion mass spectrometry is an excellent technique of analytical chemistry, where primary ions sputter a solid sample generating the secondary ions which are determined. Although the ion yield is inherently low, it can be enhanced by using a post-ionization of sputtered neutral species. Our novel approach integrates this technique with a near infrared femtosecond laser post-ionization based on an adaptive control through a laser pulse shaper. The shaping of the laser pulse provides adaptive control to select a mass peak of interest and to enhance this peak intensity...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28729400/vessel-targeted-chemophototherapy-with-cationic-porphyrin-phospholipid-liposomes
#6
Dandan Luo, Jumin Geng, Nasi Li, Kevin A Carter, Shuai Shao, G Ekin Atilla-Gokcumen, Jonathan F Lovell
Cationic liposomes have been used for targeted drug delivery to tumor blood vessels, via mechanisms that are not fully elucidated. Doxorubicin (Dox)-loaded liposomes were prepared that incorporate a cationic lipid; 1,2-dioleoyl-3-trimethylammonium-propane (DOTAP), along with a small amount of porphyrin-phospholipid (PoP). Near infrared (NIR) light induced release of entrapped Dox via PoP-mediated DOTAP photo-oxidation. The formulation was optimized to enable extremely rapid NIR light-triggered Dox release (i...
July 20, 2017: Molecular Cancer Therapeutics
https://www.readbyqxmd.com/read/28728924/strabismus-measurements-with-novel-video-goggles
#7
Konrad P Weber, Daniel Rappoport, Muriel Dysli, Tanja Schmückle Meier, Guy B Marks, Christopher J Bockisch, Klara Landau, Hamish G MacDougall
PURPOSE: To assess the validity of a novel, simplified, noninvasive test for strabismus using video goggles. DESIGN: Cross-sectional method comparison study in which the new test, the strabismus video goggles, is compared with the existing reference standard, the Hess screen test. PARTICIPANTS: We studied 41 adult and child patients aged ≥6 years with ocular misalignment owing to congenital or acquired paralytic or comitant strabismus and 17 healthy volunteers...
July 17, 2017: Ophthalmology
https://www.readbyqxmd.com/read/28725052/monolithically-integrated-te-mode-1d-silicon-on-insulator-isolators-using-seedlayer-free-garnet
#8
Cui Zhang, Prabesh Dulal, Bethanie J H Stadler, David C Hutchings
The first experimental TE-mode silicon-on-insulator (SOI) isolators using Faraday Rotation are here realized to fill the 'missing link' in source-integrated near infrared photonic circuits. The isolators are simple 1D 2-element waveguides, where garnet claddings and longitudinal magnetic fields produce nonreciprocal mode conversion, the waveguide equivalent of Faraday Rotation (FR). Quasi-phase matched claddings are used to overcome the limitations of birefringence. Current experimental SOI isolators use nonreciprocal phase shift (NRPS) in interferometers or ring resonators, but to date NRPS requires TM-modes, so the TE-modes normally produced by integrated lasers cannot be isolated without many ancillary polarisation controls...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28724901/real-time-and-label-free-chemical-sensor-on-a-chip-using-monolithic-si-on-batio3-mid-infrared-waveguides
#9
Tiening Jin, Leigang Li, Bruce Zhang, Hao-Yu Greg Lin, Haiyan Wang, Pao Tai Lin
Chip-scale chemical detection is demonstrated by using mid-Infrared (mid-IR) photonic circuits consisting of amorphous silicon (a-Si) waveguides on an epitaxial barium titanate (BaTiO3, BTO) thin film. The highly c-axis oriented BTO film was grown by the pulsed laser deposition (PLD) method and it exhibits a broad transparent window from λ = 2.5 μm up to 7 μm. The waveguide structure was fabricated by the complementary metal-oxide-semiconductor (CMOS) process and a sharp fundamental waveguide mode has been observed...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28723086/formation-of-core-shell-ethane-silver-clusters-in-he-droplets
#10
Evgeny Loginov, Luis F Gomez, Boris G Sartakov, Andrey F Vilesov
Ethane core - silver shell clusters consisting of several thousand particles have been assembled in helium droplets upon capture of first ethane molecules, followed by Ag atoms. The composite clusters were studied via infrared laser spectroscopy in the range of C-H stretching vibrations of ethane molecules. The spectra show the splitting of the vibrational bands, which was assigned to different environment of the molecules, such as in contact or devoid of a contact with Ag atoms. The analysis of the band intensities for different number of trapped ethane molecules and Ag atoms indicates that the composite clusters consist of ethane core covered with small Ag clusters having different degree of submergence on the surface...
July 19, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28721672/ir-maldesi-mass-spectrometry-imaging-at-50-micron-spatial-resolution
#11
Mark T Bokhart, Jeffrey Manni, Kenneth P Garrard, Måns Ekelöf, Milad Nazari, David C Muddiman
High spatial resolution in mass spectrometry imaging (MSI) is crucial to understanding the biology dictated by molecular distributions in complex tissue systems. Here, we present MSI using infrared matrix-assisted laser desorption electrospray ionization (IR-MALDESI) at 50 μm resolution. An adjustable iris, beam expander, and an aspherical focusing lens were used to reduce tissue ablation diameters for MSI at high resolution. The laser beam caustic was modeled using laser ablation paper to calculate relevant laser beam characteristics...
July 18, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28720892/dual-band-wide-angle-metamaterial-perfect-absorber-based-on-the-combination-of-localized-surface-plasmon-resonance-and-helmholtz-resonance
#12
Changlei Zhang, Cheng Huang, Mingbo Pu, Jiakun Song, Zeyu Zhao, Xiaoyu Wu, Xiangang Luo
In this article, a dual-band wide-angle metamaterial perfect absorber is proposed to achieve absorption at the wavelength where laser radar operates. It is composed of gold ring array and a Helmholtz resonance cavity spaced by a Si dielectric layer. Numerical simulation results reveal that the designed absorber displays two absorption peaks at the target wavelength of 10.6 μm and 1.064 μm with the large frequency ratio and near-unity absorptivity under the normal incidence. The wide-angle absorbing property and the polarization-insensitive feature are also demonstrated...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28717571/visible-spectrum-extended-focus-optical-coherence-microscopy-for-label-free-sub-cellular-tomography
#13
Paul J Marchand, Arno Bouwens, Daniel Szlag, David Nguyen, Adrien Descloux, Miguel Sison, Séverine Coquoz, Jérôme Extermann, Theo Lasser
We present a novel extended-focus optical coherence microscope (OCM) attaining 0.7 μm axial and 0.4 μm lateral resolution maintained over a depth of 40 μm, while preserving the advantages of Fourier domain OCM. Our system uses an ultra-broad spectrum from a supercontinuum laser source. As the spectrum spans from near-infrared to visible wavelengths (240 nm in bandwidth), we call the system visOCM. The combination of such a broad spectrum with a high-NA objective creates an almost isotropic 3D submicron resolution...
July 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28714985/electrical-pumping-and-tuning-of-exciton-polaritons-in-carbon-nanotube-microcavities
#14
Arko Graf, Martin Held, Yuriy Zakharko, Laura Tropf, Malte C Gather, Jana Zaumseil
Exciton-polaritons are hybrid light-matter particles that form upon strong coupling of an excitonic transition to a cavity mode. As bosons, polaritons can form condensates with coherent laser-like emission. For organic materials, optically pumped condensation was achieved at room temperature but electrically pumped condensation remains elusive due to insufficient polariton densities. Here we combine the outstanding optical and electronic properties of purified, solution-processed semiconducting (6,5) single-walled carbon nanotubes (SWCNTs) in a microcavity-integrated light-emitting field-effect transistor to realize efficient electrical pumping of exciton-polaritons at room temperature with high current densities (>10 kA cm(-2)) and tunability in the near-infrared (1,060 nm to 1,530 nm)...
July 17, 2017: Nature Materials
https://www.readbyqxmd.com/read/28712152/teeth-bleaching-with-low-concentrations-of-hydrogen-peroxide-6-and-catalyzed-by-led-blue-450%C3%A2-%C3%A2-%C3%A2-10-nm-and-laser-infrared-808%C3%A2-%C3%A2-%C3%A2-10-nm-light-for-in-office-treatment-randomized-clinical-trial-1-year-follow-up
#15
Patricio Vildósola, Jessica Bottner, Francisca Avalos, Isidora Godoy, Javier Martín, Eduardo Fernández
OBJECTIVES: The aim of this study was to evaluate color longevity after a year of in-office bleaching with gel (6% hydrogen peroxide HP, LED blue/laser infrared activation system) compared to a 35% control concentration in a split-mouth study model. MATERIALS AND METHODS: Thirty-one patients were initially treated. The bleaching procedure with 6% or 35% gel HP was performed randomly in the upper half arcade of each patient. The color was measured at baseline and at 1 week, 1 month, and 1 year using the spectrophotometer Vita Easyshade, Vita Bleached, and Vita classical Shade guide organized by value...
July 16, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/28710483/near-infrared-induced-phase-shifted-icg-fe3o4-loaded-plga-nanoparticles-for-photothermal-tumor-ablation
#16
Chengcheng Niu, Yan Xu, Senbo An, Ming Zhang, Yihe Hu, Long Wang, Qinghai Peng
Near-infrared (NIR) laser-induced photothermal therapy (PTT) uses a photothermal agent to convert optical energy into thermal energy and has great potential as an effective local, minimally invasive treatment modality for killing cancer cells. To improve the efficacy of PTT, we developed poly(lactide-co-glycolide) (PLGA) nanoparticles (NPs) encapsulating superparamagnetic iron oxide (Fe3O4), indocyanine green (ICG), and perfluoropentane (PFP) as synergistic agents for NIR laser-induced PTT. We fabricated a novel type of phase-shifting fluorescent magnetic NPs, Fe3O4/ICG@PLGA/PFP NPs, that effectively produce heat in response to NIR laser irradiation for an enhanced thermal ablation effect and a phase-shift thermoelastic expansion effect, and thus, can be used as a photothermal agent...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28710398/unique-adjustable-uc-luminescence-pattern-and-directional-radiation-of-peculiar-shaped-nayf4-yb-3-er-3-microcrystal-particle
#17
Qingyan Han, Chengyun Zhang, Chi Wang, Zhaojin Wang, Caixia Li, Wei Gao, Jun Dong, Enjie He, Zhenglong Zhang, Hairong Zheng
A new design of peculiar-shaped β-NaYF4: 20% Yb(3+)/2% Er(3+) hexagonal microcrystal (PSβHM) is proposed and its upconversion (UC) luminescence with adjustable color pattern is studied with near infrared excitation. Flower-like green UC luminescence emission pattern from blooming to withering process and intensive directional red emission are achieved by simply adjusting the focal point position of the excitation light. The mechanism that determines the unique UC luminescence phenomena are investigated systematically...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28710250/near-infrared-1064-nm-laser-modulates-migratory-dendritic-cells-to-augment-the-immune-response-to-intradermal-influenza-vaccine
#18
Kaitlyn Morse, Yoshifumi Kimizuka, Megan P K Chan, Mai Shibata, Yusuke Shimaoka, Shu Takeuchi, Benjamin Forbes, Christopher Nirschl, Binghao Li, Yang Zeng, Roderick T Bronson, Wataru Katagiri, Ayako Shigeta, Ruxandra F Sîrbulescu, Huabiao Chen, Rhea Y Y Tan, Kosuke Tsukada, Timothy Brauns, Jeffrey Gelfand, Ann Sluder, Joseph J Locascio, Mark C Poznansky, Niroshana Anandasabapathy, Satoshi Kashiwagi
Brief exposure of skin to near-infrared (NIR) laser light has been shown to augment the immune response to intradermal vaccination and thus act as an immunologic adjuvant. Although evidence indicates that the NIR laser adjuvant has the capacity to activate innate subsets including dendritic cells (DCs) in skin as conventional adjuvants do, the precise immunological mechanism by which the NIR laser adjuvant acts is largely unknown. In this study we sought to identify the cellular target of the NIR laser adjuvant by using an established mouse model of intradermal influenza vaccination and examining the alteration of responses resulting from genetic ablation of specific DC populations...
July 14, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28708144/coherent-field-transients-below-15%C3%A2-%C3%A2-thz-from-phase-matched-difference-frequency-generation-in-4h-sic
#19
Marco P Fischer, Johannes Bühler, Gabriel Fitzky, Takayuki Kurihara, Stefan Eggert, Alfred Leitenstorfer, Daniele Brida
We experimentally demonstrate tunable, phase-matched difference frequency generation covering the spectral region below 15 THz using 4H-SiC as a nonlinear crystal. This material combines a non-centrosymmetric lattice and strong birefringence with broadband transparency at low optical frequencies. Thorough refractive index measurements in the terahertz spectral range allow us to calculate phase-matching conditions for any near-infrared pump laser source. 4H-SiC is also exploited as a detector crystal for electro-optic sampling...
July 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28707960/biofunctionalized-hybrid-magnetic-gold-nanoparticles-as-catalysts-for-photothermal-ablation-of-colorectal-liver-metastases
#20
Sarah B White, Dong-Hyun Kim, Yang Guo, Weiguo Li, Yihe Yang, Jeane Chen, Venkateswara R Gogineni, Andrew C Larson
Purpose To demonstrate that anti-MG1 conjugated hybrid magnetic gold nanoparticles (HNPs) act as a catalyst during photothermal ablation (PTA) of colorectal liver metastases, and thus increase ablation zones. Materials and Methods All experiments were performed with approval of the institutional animal care and use committee. Therapeutic and diagnostic multifunctional HNPs conjugated with anti-MG1 monoclonal antibodies were synthesized, and the coupling efficiency was determined. Livers of 19 Wistar rats were implanted with 5 × 10(6) rat colorectal liver metastasis cell line cells...
July 13, 2017: Radiology
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