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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/28724961/coherence-properties-of-different-light-sources-and-their-effect-on-the-image-sharpness-and-speckle-of-holographic-displays
#2
Yuanbo Deng, Daping Chu
Coherence properties of different light sources and how they affect the image quality of holographic display are investigated. Temporal coherence is related to the intrinsic spectrum bandwidth of the light source, while spatial coherence can be affected by the size of the light source and propagation distance in use. These two coherence properties are measured for various light sources of diode-pumped solid-state (DPSS) laser, laser diode (LD), light emitting diode (LED), super luminescent light emitting diode (sLED) and micro light emitting diode (mLED) in different settings, together with the quality of the holographic reconstructed images...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28723734/transcanalicular-diode-laser-assisted-revision-surgery-for-failed-dacryocystorhinostomy-with-or-without-distal-or-common-canalicular-obstruction
#3
Je Moon Yoon, Seung Wan Nam, Kyung In Woo, Yoon-Duck Kim
PURPOSE: To report the outcomes of transcanalicular diode laser-assisted revision surgery for failed dacryocystorhinostomy with/without distal or common canalicular obstruction. METHODS: The medical records and recorded videos of consecutive transcanalicular diode laser-assisted revision surgeries performed for failed dacryocystorhinostomy between May 2011 and May 2015 were reviewed. Cases of unavailability of video and cases lost to follow up after surgery were excluded from the study...
July 18, 2017: Ophthalmic Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28717563/multiphoton-in-vivo-imaging-with-a-femtosecond-semiconductor-disk-laser
#4
Fabian F Voigt, Florian Emaury, Philipp Bethge, Dominik Waldburger, Sandro M Link, Stefano Carta, Alexander van der Bourg, Fritjof Helmchen, Ursula Keller
We use an ultrafast diode-pumped semiconductor disk laser (SDL) to demonstrate several applications in multiphoton microscopy. The ultrafast SDL is based on an optically pumped Vertical External Cavity Surface Emitting Laser (VECSEL) passively mode-locked with a semiconductor saturable absorber mirror (SESAM) and generates 170-fs pulses at a center wavelength of 1027 nm with a repetition rate of 1.63 GHz. We demonstrate the suitability of this laser for structural and functional multiphoton in vivo imaging in both Drosophila larvae and mice for a variety of fluorophores (including mKate2, tdTomato, Texas Red, OGB-1, and R-CaMP1...
July 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28708170/widely-wavelength-tunable-fast-intensity-modulated-light-source-for-biophotonic-applications
#5
Tzu-Feng Huang, Sheng-Hao Tseng, Hsien-Yi Wang, Ming-Che Chan
High modulation depth, fast (megahertz to gigahertz), intensity-modulated light sources of various wavelengths within the 0.7-1.35 μm bio-penetration window are highly desirable for many biophotonic diagnosis systems. In this Letter, we present a novel scheme of a wavelength tunable, ultra-broadband light source which simply consists of a pump laser, a nonlinear fiber, and demodulation circuits. The working wavelength range of the light source is from 0.7 to 1.35 μm which covers a vast part of the bio-penetration window, and its modulation frequencies extends from tens of megahertz to gigahertz...
July 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28708162/high-energy-nd-yag-laser-system-with-arbitrary-sub-nanosecond-pulse-shaping-capability
#6
R A Meijer, A S Stodolna, K S E Eikema, S Witte
We report on a laser system capable of generating high-energy (>270  mJ) temporally shaped pulses at 1064 nm with 0.43-ns shaping resolution. The pulses are generated by modulation of a continuous-wave seed laser and subsequent amplification by a dual-stage grazing-incidence Nd:YVO4 "bounce" amplifier and a Nd:YAG power amplifier (all quasi-continuous diode-pumped). The system produces pulses with a high-quality top-hat spatial beam profile with up to 0.6 GW of peak power and 44 W of average power, a power stability of 0...
July 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28708147/real-time-online-photonic-random-number-generation
#7
Pu Li, Jianguo Zhang, Luxiao Sang, Xianglian Liu, Yanqiang Guo, Xiaomin Guo, Anbang Wang, K Alan Shore, Yuncai Wang
We present a real-time scheme for ultrafast random number (RN) extraction from a broadband photonic entropy source. Ultralow jitter mode-locked pulses are used to sample the stochastic intensity fluctuations of the entropy source in the optical domain. A discrete self-delay comparison technology is exploited to quantize the sampled pulses into continuous RN streams directly. This scheme is bias free, eliminates the electronic jitter bottleneck confronted by currently available physical RN generators, and has no need for threshold tuning and post-processing...
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
#8
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
https://www.readbyqxmd.com/read/28701791/multi-photon-absorption-enhancement-by-dual-wavelength-double-pulse-laser-irradiation-for-efficient-dicing-of-sapphire-wafers
#9
Mindaugas Gedvilas, Justinas Mikšys, Jonas Berzinš, Valdemar Stankevič, Gediminas Račiukaitis
The evidence of multi-photon absorption enhancement by the dual-wavelength double-pulse laser irradiation in transparent sapphire was demonstrated experimentally and explained theoretically for the first time. Two collinearly combined laser beams with the wavelengths of 1064 nm and 355 nm, inter-pulse delay of 0.1 ns, and pulse duration of 10 ps were used to induce intra-volume modifications in sapphire. The theoretical prediction of using a particular orientation angle of 15 degrees of the half-wave plate for the most efficient absorption of laser irradiation is in good agreement with the experimental data...
July 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28699660/binding-of-indocyanine-green-in-polycaprolactone-fibers-using-blend-electrospinning-for-in-vivo-laser-assisted-vascular-anastomosis
#10
Annemarie Schönfeld, Zacharia Mbäıdjol Kabra, Mihai Constantinescu, Dieter Bosshardt, Michael H Stoffel, Kirsten Peters, Martin Frenz
BACKGROUND AND OBJECTIVE: The clinical application of laser-assisted vascular anastomosis is afflicted by unreliable and low bonding strengths as well as tedious handling during microvascular surgery. The challenge to be met arises from the flow-off of the chromophore during soldering that changes the absorption and stains the surrounding tissue, leading to an uncontrollable thermal damage zone. In this study, we investigated the feasibility to produce an indocyanine green (ICG)-loaded patch by electrospinning and tested its applicability to both in vitro and in vivo microvascular laser soldering...
July 12, 2017: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/28698889/blue-diode-laser-versus-traditional-infrared-diode-laser-and-quantic-molecular-resonance-scalpel-clinical-and-histological-findings-after-excisional-biopsy-of-benign-oral-lesions
#11
Margherita Gobbo, Rossana Bussani, Giuseppe Perinetti, Katia Rupel, Lorenzo Bevilaqua, Giulia Ottaviani, Matteo Biasotto
No abstract text is available yet for this article.
December 1, 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28697234/development-of-low-cost-photoacoustic-imaging-systems-using-very-low-energy-pulsed-laser-diodes
#12
Ali Hariri, Afreen Fatima, Nafiseh Mohammadian, Sadreddin Mahmoodkalayeh, Mohammad Ali Ansari, Nicholas Bely, Mohammad R N Avanaki
No abstract text is available yet for this article.
July 1, 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28692322/the-use-of-lasers-in-the-treatment-of-skin-cancer-a-review
#13
Fatima N Mirza, Khalil A Khatri
BACKGROUND: In considering skin cancer, a number of factors - including effectiveness, simplicity of treatment, cost, and aesthetic outcomes - are important to ensure patient satisfaction. There are several existing interventions, such as electrodessication and curettage, excision, Mohs surgery, radiation therapy, cryotherapy, and topical/oral treatments. Laser therapy has emerged as a new promising alternative that should be explored. OBJECTIVE: To review the dermatologic literature on the use of laser therapy in the treatment of skin cancer...
July 10, 2017: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/28691432/effect-of-diode-lasers-with-wavelength-of-445-and-980-nm-on-a-temperature-rise-when-uncovering-implants-for-second-stage-surgery-an-ex-vivo-study-in-pigs
#14
Jacek Matys, Rafał Flieger, Marzena Dominiak
BACKGROUND: Many surgical procedures in a soft tissue are performed using diodes lasers. Recently, a novel diode laser operates in 445 nm wavelength was introduced in dentistry. OBJECTIVES: The aim of our study was to evaluate a time of surgery and an increase in temperature of a titanium implants during its uncovering using 445 and 980 nm wavelengths. MATERIAL AND METHODS: The research included 45 pig mandibles (n=45). The specimens were randomly divided into 3 groups (n=15) according to the laser irradiation mode and wavelength; G1 - 445nm laser, power: 3 W, continuous wave (CW), distance: 2 mm, power density: 7460 W/cm2, fiber: 320µm, none-contact mode; G2 - 445nm laser (power: 2 W, CW, power density: 4970 W/cm2, fiber: 320µm, contact mode; G3 (control) - 980nm laser, power: 2...
June 27, 2017: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/28688677/long-term-survival-of-a-randomized-phase-iii-trial-of-head-and-neck-cancer-patients-receiving-concurrent-chemoradiation-therapy-with-or-without-low-level-laser-therapy-lllt-to-prevent-oral-mucositis
#15
Héliton S Antunes, Daniel Herchenhorn, Isabele A Small, Carlos M M Araújo, Celia Maria Pais Viégas, Gabriela de Assis Ramos, Fernando L Dias, Carlos G Ferreira
BACKGROUND: The impact of low-level laser therapy (LLLT) to prevent oral mucositis in patients treated with exclusive chemoradiation therapy remains unknown. This study evaluated the overall, disease-free and progression-free survival of these patients. METHODS: Overall, disease-free and progression-free survival of 94 patients diagnosed with oropharynx, nasopharynx, and hypopharynx cancer, who participated on a phase III study, was evaluated from 2007 to 2015. The patients were subjected to conventional radiotherapy plus cisplatin every 3weeks...
August 2017: Oral Oncology
https://www.readbyqxmd.com/read/28685578/the-vital-role-of-oxygen-for-the-formation-of-highly-rectifying-schottky-barrier-diodes-on-amorphous-zinc-tin-oxide-with-various-cation-composition
#16
Sofie Bitter, Peter Schlupp, Holger von Wenckstern, Marius Grundmann
We present electrical properties of Schottky barrier diodes on room temperature deposited amorphous zinc-tin-oxide (ZTO) with Zn/(Zn+Sn) contents between 0.12 and 0.72. A combinatorial approach with continuous composition spread pulsed laser deposition is used to achieve the wide range of compositions with four samples each on 50×50mm glass substrates. The Schottky barrier contacts were fabricated by reactive direct current sputtering of platinum. Best diode properties (rectification ratio SV=2.7×10(7), ideality factor η=1...
July 7, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28684911/photothermal-therapy-of-melanoma-tumor-using-multiwalled-carbon-nanotubes
#17
Zahra Sobhani, Mohammad Ali Behnam, Farzin Emami, Amirreza Dehghanian, Iman Jamhiri
Photothermal therapy (PTT) is a therapeutic method in which photon energy is transformed into heat rapidly via different operations to extirpate cancer. Nanoparticles, such as carbon nanotubes (CNTs) have exceptional optical absorbance in visible and near infrared spectra. Therefore, they could be a good converter to induce hyperthermia in PTT technique. In our study, for improving the dispersibility of multiwalled CNTs in water, the CNTs were oxidized (O-CNTs) and then polyethylene glycol (PEG) was used for wrapping the surface of nanotubes...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28683481/-recanalization-of-lacrimal-duct-stenosis-by-laserdacryoplasty-using-a-diode-laser-comparison-of-success-rates-using-an-erbium%C3%A2-%C3%A2-yag-laser
#18
Ludwig Stock, Ralf Ungerechts, Karl-Heinz Emmerich
Background In a retrospective study, the success rates of laserdacryoplasty using a diode laser were defined and compared to success rates using an erbium : YAG laser. Using a diode laser at a wave length of 980 nm, thermal destruction of tissue leads to recanalization. Using an erbium : YAG laser at a wave length of 2940 nm, recanalization of punctual stenosis is achieved by formation of a cavitation bubble in a closed system. Materials and Methods 94 patients (64 women, 30 men, mean age 60.8 years) with 107 absolute lacrimal duct stenoses who were treated by laserdacryoplasty using a diode laser were included in a retrospective study...
July 6, 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/28681999/tailoring-the-performances-of-lead-halide-perovskite-devices-with-electron-beam-irradiation
#19
Ningbo Yi, Shuai Wang, Zonghui Duan, Kaiyang Wang, Qinghai Song, Shumin Xiao
Lead halide perovskites are intensively studied in past few years due to their potential applications in optoelectronic devices such as solar cells, photodetectors, light-emitting diodes (LED), and lasers. In addition to the rapid developments in material synthesis and device fabrication, it is also very interesting to postsynthetically control the optical properties with external irradiations. Here, the influences of very low energy (10-20 keV) electron beam of standard electron beam lithography are experimentally explored on the properties of lead halide perovskites...
July 6, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28678477/laps-and-spim-imaging-using-ito-coated-glass-as-the-substrate-material
#20
De-Wen Zhang, Fan Wu, Steffi Krause
Light-addressable potentiometric sensors (LAPS) and scanning photo-induced impedance microscopy (SPIM) use photocurrent measurements for spatiotemporal imaging of ion concentrations, electrical potentials, and impedance. In this work, ITO-coated glass was confirmed to produce photocurrents at anodic potentials with 405 nm diode laser illumination. Therefore, it was developed as a low cost and robust substrate material for LAPS and SPIM imaging compared to traditional expensive ultrathin Si substrates. ITO showed good ac photocurrent and pH response without surface modification and insulator...
July 17, 2017: Analytical Chemistry
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