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Fractionated laser

Amira A Abdel Azim, Rania T Salem, Rania Abdelghani
BACKGROUND: Multiple treatment modalities were introduced for treatment of hidradenitis suppurativa (HS) but mostly with unsatisfactory results. OBJECTIVE: In this prospective randomized right-left intra-individual controlled study, we studied the safety and efficacy of combined treatment with fractional CO2 laser and long pulsed Nd : YAG (1064 nm) laser in treatment of HS. METHODS: Twenty adult patients with HS were randomized into this study...
June 16, 2018: International Journal of Dermatology
B R Halls, P S Hsu, S Roy, T R Meyer, J R Gord
Single-shot, two-color, volumetric laser-induced fluorescence was demonstrated for three-dimensional (3D), tomographic imaging of the structural properties of the OH radical and temperature field in a turbulent hydrogen-air flame. Two narrowband laser sources were tuned to the Q1 (5) and Q1 (14) transitions of the (1,0) band in the A2 Σ←X2 Π system and illuminated a volumetric region of the flame. Images from eight unique perspectives collected simultaneously from each of the two transitions were used to reconstruct overlapping OH fields with different Boltzmann fractions and map the 3D temperature distribution with nanosecond precision...
June 15, 2018: Optics Letters
Travis C Briles, Jordan R Stone, Tara E Drake, Daryl T Spencer, Connor Fredrick, Qing Li, Daron Westly, B R Ilic, Kartik Srinivasan, Scott A Diddams, Scott B Papp
We report accurate phase stabilization of an interlocking pair of Kerr-microresonator frequency combs. The two combs, one based on silicon nitride and one on silica, feature nearly harmonic repetition frequencies and can be generated with one laser. The silicon-nitride comb supports an ultrafast-laser regime with three-optical-cycle, 1-picosecond-period soliton pulses and a total dispersive-wave-enhanced bandwidth of 170 THz, while providing a stable phase-link between optical and microwave frequencies. We demonstrate nanofabrication control of the silicon-nitride comb's carrier-envelope offset frequency and spectral profile...
June 15, 2018: Optics Letters
Jennifer Zuccaro, Inga Muser, Manni Singh, Janelle Yu, Charis Kelly, Joel Fish
Treatment with laser therapy has the potential to greatly improve hypertrophic scarring in individuals who have sustained burn injuries. More specifically, recent research has demonstrated the success of using pulsed dye laser therapy to help reduce redness and postburn pruritus and using ablative fractional CO2 laser therapy to improve scar texture and thickness. This study describes our early experience using laser therapy in our pediatric burn program and details our specific treatment approach when using each laser individually and in combination during the same procedure...
April 20, 2018: Journal of Burn Care & Research: Official Publication of the American Burn Association
Xi Luo, Li-Ting Tseng, Yiren Wang, Nina Bao, Zunming Lu, Xiang Ding, Rongkun Zheng, Yonghua Du, Kevin Huang, Lei Shu, Andreas Suter, Wai Tung Lee, Rong Liu, Jun Ding, Kiyonori Suzuki, Thomas Prokscha, Elvezio Morenzoni, Jia Bao Yi
5% Fe-doped In2O3 films were deposited using a pulsed laser deposition system. X-ray diffraction and transmission electron microscopy analysis show that the films deposited under oxygen partial pressures of 10-3 and 10-5 torr are uniform without clusters or secondary phases. However, the film deposited under 10-7 torr has a Fe rich phase at the interface. Magnetic measurements demonstrate that the magnetization of the films increases with decreasing oxygen partial pressure. Muon spin relaxation (µSR) analysis indicates that the volume fraction of the ferromagnetic phases in PO2=10-3, 10-5 and 10-7 torr deposited samples are 23%, 49% and 68% respectively, suggesting clusters or secondary phases may not be the origin of the ferromagnetism, and that the ferromagnetism is not carrier-mediated...
June 12, 2018: ACS Applied Materials & Interfaces
S Cárdenas-Pérez, J J Chanona-Pérez, N Güemes-Vera, J Cybulska, M Szymanska-Chargot, M Chylinska, A Kozioł, D Gawkowska, P M Pieczywek, A Zdunek
Mango is an important crop worldwide, with a postharvest loss that is huge due to its climacteric behaviour. This study evaluated the softening of Tommy Atkins mangos during the ripening process. Ripening index (RPI) shown a decrease from 9.18 ± 0.14 to 4.75 ± 0.47. The enzymatic activity agreed with physicochemical parameters and with the structural and mechanical changes. Three pectin fractions were isolated from the mango cell wall: water soluble (WSP), chelator soluble (CSP) and diluted alkali soluble (DASP) pectin...
September 15, 2018: Carbohydrate Polymers
Jin H Park, Tim S Chung, Vince M Hipwell, Edris A Rivera, Miguel A Garcia-Garibay
Recent work has shown that diarylmethyl radicals generated by pulsed laser excitation in nanocrystalline (NC) suspensions of tetraarylacetones constitute a valuable probe for the detailed mechanistic analysis of the solid-state photodecarbonylation reaction. Using a combination of reaction quantum yields and laser flash photolysis in nanocrystalline suspensions of ketones with different substituents on one of the α-carbons we are able to suggest with confidence that a significant fraction of the initial α-cleavage reaction takes place from the ketone singlet excited state, that the originally formed diarylmethyl-acyl radical pair loses CO in the crystal with time constants in the sub-nanosecond regime, and that the secondary bis(diarylmethyl) triplet radical pair has a lifetime limited by the rate of intersystem crossing of ca...
June 11, 2018: Journal of the American Chemical Society
Koyo Ido, Hideyuki Obayashi, Yanbei Zhu, Takafumi Hirata, Akiko Hokura, Naoko Nonose, Kazumi Inagaki
A method was established for the quantitative analysis of the elements (Cu, Ag, Pb, and Sn) in solder samples by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), with Sn-based matrix matched standard solutions for defining the calibration curves. It was found that chloride-ion presented in commercially available Sn standard solution resulted in a precipitation of AgCl and caused the deterioration of the linearity of the calibration curve for Ag. Therefore, a laboratory-made chloride-free Sn solution was used to prepare Sn matrix matched standard solutions so as to ensure the stability of the elements including Ag...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
Raphael Wiedey, Rok Sibanc, Peter Kleinebudde
Ribbon solid fraction is one of the most important quality attributes during roll compaction/dry granulation. Accurate and precise determination is challenging and no in-line measurement tool has been generally accepted, yet. In this study, a new analytical tool with potential off-line as well as in-line applicability is described. It is based on the thermo-conductivity of the compacted material, which is known to depend on the solid fraction. A laser diode was used to punctually heat the ribbon and the heat propagation monitored by infrared thermography...
June 6, 2018: International Journal of Pharmaceutics
Paul Gittens, Gregory Mullen
PURPOSE: To examine the outcomes of sexual function in postmenopausal women and women with a history of breast cancer treated with endocrine therapy who were experiencing the symptoms of GSM for which they were treated with fractional microablative CO2 laser. MATERIALS AND METHODS: From July 2015 to October 2016, a retrospective chart review of women who underwent fractional microablative CO2 laser therapy (MonaLisa Touch, DEKA) for GSM was conducted. Several validated questionnaires were used to assess changes in symptoms and sexual function including the Female Sexual Function Index (FSFI), the Wong-Baker Faces Scale (WBFS), and the Female Sexual Distress Scale-Revised (FSDSR)...
June 8, 2018: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
Boris Knyazev, Oleg Kameshkov, Nikolay Vinokurov, Valery Cherkassky, Yulia Choporova, Vladimir Pavelyev
We study diffraction of Bessel vortex beams with topological charges of ±1 and ±2 and a wavelength of 130 µm on two-dimensional amplitude periodic gratings. Results of simulations and experiments at the Novosibirsk Free Electron Laser facility show that there appear periodic patterns in the planes corresponding to the classical main and fractional Talbot planes, but instead of self-images of the holes, there are observed periodic lattices of annular vortex microbeams with topological charges corresponding to the charge of the beam illuminating the grating...
May 28, 2018: Optics Express
Fotini Vrani, Elena Sotiriou, Elisabeth Lazaridou, Efstratios Vakirlis, Nikolaos Sideris, Eirini Kirmanidou, Zoe Apalla, Amilios Lallas, Demetrios Ioannides
BACKGROUND: Topical methyl-aminolevulinate photodynamic therapy (MAL-PDT) with 3 hours incubation is recommended as a field directed treatment. Skin pretreatment with ablative CO2 fractional laser (AFXL) prior to MAL-PDT enhances drug penetration and could minimize incubation time. OBJECTIVES: To evaluate and compare the safety and the preventive effect in the development of new non-melanocytic skin cancers (NMSCs) of AFXL-assisted MAL-PDT with one hour incubation with that of conventional MAL-PDT in patients with clinical and histological signs of field cancerization...
June 4, 2018: Journal of the European Academy of Dermatology and Venereology: JEADV
Megan M Brown, Arisa Ortiz
No abstract text is available yet for this article.
June 1, 2018: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
Rajkumar Kore, Steven P Kelley, Pavankumar Aduri, Robin D Rogers
Two solids of differing Lewis acidities, triethylammonium tetrachlorozincate ([HN222]2[ZnCl4]) and AlCl3, have been combined across 0.1 to 0.9 mole fractions (with respect to [HN222]2[ZnCl4]), and homogeneous solid double salts or mixed metal [HN222]2x[(1 - x)AlCl3 + xZnCl4] double salt ionic liquids (DSILs) were obtained at x = 0.33, 0.4, and 0.5 with varying Lewis acidities. The characterization of the prepared DSILs (melting point, color, homogeneity, 1H, 13C, and 27Al nuclear magnetic resonance spectroscopy (NMR), infrared spectroscopy (IR), single crystal X-ray diffraction (SCXRD), and matrix-assisted laser-desorption ionization time-of-flight (MALDI-TOF) mass spectrometry) suggests that [HN222]2[ZnCl4] transfers Cl- from [ZnCl4]2- to the stronger Lewis acid AlCl3, forming intermediate acidic DSILs with [AlCl4]- and [Al2Cl7]- anions and mixed anionic Zn species...
May 31, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Dina-Wahied El Assal, Ali-Mohamed Saafan, Dina-Hassan Moustafa, Marwa-Adel Al-Sayed
Background: The aim of this study was to evaluate the effect of combining fractional CO2 LASER and nanohydroxy apatite on surface microhardness and color of enamel with initial defects. Material and Methods: Two types of nano hydroxylapatite (nHAP) was prepared; Pure hydroxyapatite (nHA) and Fluoro hydroxyapatite (nFHA), Sixty extracted premolar teeth without visible caries or structural defects on enamel surface were used, immersed in 10 ml of a demineralizing solution for 2 weeks to create artificial white spot lesions, they were randomly allocated into two groups; Group 1: nHA, Group 2: nFHA, each group is then subdivided into 2 subgroups (A and B) where two different in vitro remineralization procedures have been performed, the first procedure utilizes a 10 wt% nHA aqueous slurries only, the second was first exposed to irradiation from a fractional CO2 laser then (nHAP) was applied...
May 2018: Journal of Clinical and Experimental Dentistry
Sandeep Sankaranarayanan, Shonal Chouksey, Pratim Saha, Vikas Pendem, Ankit Udai, Tarni Aggarwal, Swaroop Ganguly, Dipankar Saha
GaN based nanostructures are being increasingly used to improve the performance of various devices including light emitting diodes and lasers. It is important to determine the strain relaxation in these structures for device design and better prediction of device characteristics and performance. We have determined the strain relaxation in InGaN/GaN nanowalls from quantum confinement and exciton binding energy dependent photoluminescence peak. We have further determined the strain relaxation as a function of nanowall dimension...
May 30, 2018: Scientific Reports
Joanna H Tu, Jeremy A Udkoff, Lawrence F Eichenfield
No abstract text is available yet for this article.
May 24, 2018: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
Marianne B Ariganello, Dharani D Das, Dalibor Breznan, Christine MacKinnon-Roy, Fred Elisma, Aziz Khanchi, Renaud Vincent, Prem Kumarathasan
Knowledge of biological reactivity and underlying toxicity mechanisms of airborne particulate matter (PM) is central to the characterization of the risk associated with these pollutants. An integrated screening platform consisting of protein profiling of cellular responses and cytotoxic analysis was developed in this study for the estimation of PM potencies. Mouse macrophage (J774A.1) and human lung epithelial cells (A549) were exposed in vitro to Ottawa urban particles (EHC6802) and two reference mineral particles (TiO2 and SiO2 )...
May 29, 2018: Journal of Applied Toxicology: JAT
Shen-Ling Wang, Hong Qi, Ya-Tao Ren, Qin Chen, Li-Ming Ruan
Thermal therapy is a very promising method for cancer treatment, which can be combined with chemotherapy, radiotherapy and other programs for enhanced cancer treatment. In order to get a better effect of thermal therapy in clinical applications, optimal internal temperature distribution of the tissue embedded with gold nanoparticles (GNPs) for enhanced thermal therapy was investigated in present research. The Monte Carlo method was applied to calculate the heat generation of the tissue embedded with GNPs irradiated by continuous laser...
May 2018: Journal of Thermal Biology
Joy Tao, Amanda Champlain, Charles Weddington, Lauren Moy, Rebecca Tung
Introduction: Burn scars cause cosmetic disfigurement and psychosocial distress. We present two Fitzpatrick phototype (FP) III patients with burn scars successfully treated with combination pulsed dye laser (PDL) and non-ablative fractional lasers (NAFL). Case 1: A 30-year-old, FP III woman with a history of a second-degree burn injury to the bilateral arms and legs affecting 30% body surface area (BSA) presented for cosmetic treatment. The patient received three treatments with 595 nm PDL (7 mm, 8 J, 6 ms), six with the 1550 nm erbium:glass laser (30 mJ, 14% density, 4-8 passes) and five with the 1927 nm thulium laser (10 mJ, 30% density, 4-8 passes)...
January 2018: Scars, burns & healing
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