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Dye laser

Pelin Üstüner, Ali Balevi, Mustafa Özdemir
INTRODUCTION: There is no satisfactory and efficient method for long-term removal of white-colored and thin hair. METHODS: We conducted a randomised clinical trial of hirsute patients with excessive white and/or thin hair on the face and/or axilla. In Group I (n: 16), the facial hair on one side of the face was painted with a black eyelash mascara immediately before Nd:YAG laser and the other half was only treated by Nd:YAG. In Group II (n: 20), the axillary hair on one side was painted with the mascara before the Alexandrite laser with the other side being only treated by Alexandrite...
October 20, 2016: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
Jin Ok Baek, Hoon Hur, Ha Ryeong Ryu, Jeong Soo Kim, Kyung Real Lee, Yu Ri Kim, Kwang Ho Choi
Various lasers have been used for the treatment of erythematotelangiectatic rosacea (ETR) that does not respond to systemic or topical therapy. The pulsed dye lasers (PDLs) are an effective option for ETR, and the purpuragenic fluence proved to be superior until now. Given that purpura and subsequent possible postinflammatory hyperpigmentation (PIH) are occasionally unbearable in some patients, and several studies using the low nonpurpuragenic fluence were reported. To deliver the sufficient high fluence of a PDL without generating purpura, we designed the fractionation of high fluence using five passes and longer pulse duration (6 milliseconds) of a PDL in succession...
October 20, 2016: Journal of Cosmetic Dermatology
Bingjiang Zhou, Yunzheng Li, Guangle Niu, Minhuan Lan, Qingyan Jia, Qionglin Liang
Given their easy structural modification and good biocompatibility advantages, near-infrared (NIR) organic dyes with a large molar extinction coefficient while a super-low fluorescence quantum yield show considerable potential application in photothermal therapy (PTT). Herein, a new NIR-absorbing asymmetric cyanine dye, namely, RC, is designed and synthesized via the hybrid of rhodamine and hemicyanine derivatives. RC-BSA nanoparticles (NPs) are fabricated by using the bovine serum albumin (BSA) matrix. The NPs exhibit a strong NIR absorption peak at ~868 nm and 28...
October 19, 2016: ACS Applied Materials & Interfaces
Cletus Cheyuo, Walter Grand, Lucia L Balos
BACKGROUND: Cytoarchitectural neuroimaging remains critical for diagnosis of many brain diseases. Fluorescent dye-enhanced, near-infrared confocal in situ cellular imaging of the brain has been reported. However, impermeability of the blood-brain barrier to most fluorescent dyes limits clinical utility of this modality. The differential degree of reflectance from brain tissue with unenhanced near-infrared imaging may represent an alternative technique for in situ cytoarchitectural neuroimaging...
October 15, 2016: World Neurosurgery
Ronaldo Custodio de Souza Oliveira, Rodrigo José Corrêa, Raquel Simas Pereira Teixeira, Daniela Dias Queiroz, Rodrigo da Silva Souza, Simon John Garden, Nanci Camara de Lucas, Marcos Dias Pereira, Josué Sebastián Bello Forero, Eric Cardona Romani, Emerson Schwingel Ribeiro
In the present study, SiO2 nanoparticles functionalized with 3-(2-aminoethylamino)propyl group (SiNP-AAP) were used, for the first time, to covalently bond rose bengal (SiNP-AAP-RB) or 9,10-anthraquinone-2-carboxylic acid (SiNP-AAP-OCAq). The functionalized SiNP were characterized by: Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM); elemental analysis (CHN) for determination of the dye concentration; FTIR and UV-vis diffuse reflectance (DR-UV-vis) and a surface area study (BET). The functionalized SiNPs were applied in photodynamic therapy (PDT) against lung cancer cell lines...
October 13, 2016: Journal of Photochemistry and Photobiology. B, Biology
Hyun-Min Seo, Jung-In Kim, Han-Saem Kim, Young-Jun Choi, Won-Serk Kim
BACKGROUND: Rosacea treatments including oral/topical medications and laser therapy are numerous but unsatisfactory. OBJECTIVE: To compare the effectiveness of the dual wavelength long-pulsed 755-nm alexandrite/1,064-nm neodymium: yttrium-aluminum-garnet laser (LPAN) with that of 585-nm pulsed dye laser (PDL) for rosacea. METHODS: This was a randomized, single-blinded, comparative study. Full face received four consecutive monthly treatments with LPAN or PDL, followed-up for 6 months after the last treatment...
October 2016: Annals of Dermatology
Marton Szigeti, Andras Guttman
N-glycan profiling of therapeutic glycoproteins is essential to ensure the activity and efficacy of these promising new-generation drugs. The N-linked glycan moieties of these entities highly affect circulation half-life, immunogenicity and receptor-binding activity as well as physicochemical and thermal stability properties. In addition, more than half of the biopharmaceuticals are glycoproteins representing multibillion dollar worldwide business, further emphasizing the importance of their analysis. In the biomedical field, on the other hand, revealing disease-related glycan structure alterations holds the promise of the discovery of new biomarkers for early diagnostics...
2017: Methods in Molecular Biology
Raydsa Raíssa Moura Rosa, Francielle Karoline Santos Calazans, Ruchele Dias Nogueira, Ailla Carla Rocha Acosta Lancellotti, Luciano de Sousa Gonçalves, Vinícius Rangel Geraldo-Martins
The objective of this study was to evaluate the effects of diode laser and a desensitizing dentifrice on dentin permeability. Fifty-two root dentin fragments were obtained (5 × 5mm) and treated with 24% EDTA gel. The samples were divided into 4 groups (n = 13): G1, control (no treatment); G2, diode laser (λ = 908 nm, 1.5 W, continuous mode, 20s); G3, application of abrasive dentifrice for 1 minute (Elmex Sensitive Professional (International Gaba); and G4, application of abrasive dentifrice for 1 minute followed by irradiation with diode laser...
October 10, 2016: Brazilian Oral Research
Anouar Rahmouni, Yahya Bougdid, Sara Moujdi, Dmitry V Nesterenko, Zouheir Sekkat
Holographic storage is one of the most important applications in the field of optics, especially for recording and retrieving data, and information storage by interference patterns in photosensitive materials are no exception in this regard. In this work, we give evidence that holograms recorded by interference of two-coherent laser beams in azo dye doped polymer films can be controlled by a third incoherent assisting laser beam. We show that light diffraction can be increased or decreased by an assisting beam depending on the respective orientation of the polarizations of the recording and the assisting beams...
October 11, 2016: Journal of Physical Chemistry. B
Zhihao Li, Jianling Zhang, Tian Luo, Xiuniang Tan, Chengcheng Liu, Xinxin Sang, Xue Ma, Buxing Han, Guanying Yang
The emulsification of metal-organic frameworks (MOFs) for the two immiscible phases of water and ionic liquid (IL) was investigated for the first time. It was found that Ni-BDC (BDC = 1,4-dicarboxybenzene) can emulsify water and ILs and favor the formation of high internal phase emulsions (HIPEs) under certain experimental conditions. The microstructures of the HIPEs were characterized by confocal laser scanning microscopy using a fluorescent dye Rhodamine B, which proves that the HIPEs are the IL-in-water type...
October 11, 2016: Soft Matter
Hongjing Li, Jianhao Wang, Changshun Wang, Pengfei Zeng, Yujia Pan, Yifei Yang
Diffraction properties of photoinduced gratings recorded by overlapping two coherent beams at 532 nm in nematic liquid crystals doped with Disperse Red 1 were investigated with a probe beam at 632.8 nm. The grating was formed due to the alignment of dye molecules that leaded to the reorientation of the liquid crystal phase. The diffraction efficiency of the photoinduced grating was found to increase rapidly when the sample temperature was close to the clearing point in the nematic phase and a nearly 30-fold enhancement of the first-order diffraction efficiency was obtained...
2016: Proceedings of the Japan Academy. Series B, Physical and Biological Sciences
Adam S Backer, Maurice Y Lee, W E Moerner
Single-molecule orientation measurements provide unparalleled insight into a multitude of biological and polymeric systems. We report a simple, high-throughput technique for measuring the azimuthal orientation and rotational dynamics of single fluorescent molecules, which is compatible with localization microscopy. Our method involves modulating the polarization of an excitation laser, and analyzing the corresponding intensities emitted by single dye molecules and their modulation amplitudes. To demonstrate our approach, we use intercalating and groove-binding dyes to obtain super-resolved images of stretched DNA strands through binding-induced turn-on of fluorescence...
2016: Optica
Gunseli Katirci, R Banu Ermis
BACKGROUND: The aim of this in vitro study was to evaluate the microindentation hardness and chemical composition of residual dentin left at the cavity bottom following removal of carious dentin using the Carisolv chemomechanical and Er:YAG laser caries excavation methods in comparison with the conventional tungsten-carbide bur excavation. METHODS: Sixty-nine extracted permanent teeth with occlusal dentin caries were assigned into three groups according to caries removal technique...
2016: SpringerPlus
Mohammed J Farooqi, Mark A Penick, George R Negrete, Lorenzo Brancaleon
The chemical, physical and photophysical properties of perylene diimides have attracted substantial attention for the potential applications in diverse fields ranging from advanced materials to biomedical applications. Some applications require the diimides to be in aqueous environment where they tend to dissolve poorly. We investigated the use of human serum albumin as a vehicle to increase the aqueous exposure of monomeric perylene diimides. Since studies on the interactions of these compounds with protein is scarce we characterized the binding and the possible effects on the protein...
October 6, 2016: International Journal of Biological Macromolecules
S Biswas, P Kumbhakar
We have reported here, for the first time, to the best of our knowledge, a high nonlinear refractive index (n2e) of a natural pigment extracted from Hibiscus rosa-sinensis leaves by using spatial self-phase modulation technique (SSPM) with a low power CW He-Ne laser radiation at 632.8nm. It is found by UV-Vis absorption spectroscopic analysis that chlrophyll-a, chlrophyll-b and carotenoid are present in the pigment extract with 56%, 25% and 19%, respectively. The photoluminescence (PL) emission characteristics of the extracted samples have also been measured at room temperature as well as in the temperature range of 283-333K to investigate the effect of temperature on luminescent properties of the sample...
September 28, 2016: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Shrikant S Thakare, Goutam Chakraborty, Parvathi Krishnakumar, Alok K Ray, Dilip Kumar Maity, Haridas Pal, Nagaiyan Sekar
Supramolecular host-guest interaction of neutral and cationic (protonated) forms of two BODIPY-benzimidazole (mono-benzimidazole and di-benzimidazole) conjugate dyes with the macrocyclic host Cucurbit[7]uril (CB7) has been investigated using photophysical and DFT studies. Expectedly, cationic forms of the dyes show exceptionally stronger binding than that of the neutral forms with CB7, which can be ascribed to strong ion-dipole interaction between the positive charge of the dye and highly polarizable carbonyl portals of the host...
October 7, 2016: Journal of Physical Chemistry. B
A Miniewicz, S Bartkiewicz, H Orlikowska, K Dradrach
In the report we demonstrate how, using laser light, effectively trap gas bubbles and transport them through a liquid phase to a desired destination by shifting the laser beam position. The physics underlying the effect is complex but quite general as it comes from the limited to two-dimension, well-known, Marangoni effect. The experimental microscope-based system consists of a thin layer of liquid placed between two glass plates containing a dye dissolved in a solvent and a laser light beam that is strongly absorbed by the dye...
October 7, 2016: Scientific Reports
Naoto Tsutsumi, Saori Nagi, Kenji Kinashi, Wataru Sakai
Organic solid-state lasers (OSSLs) with distributed feedback structures can detect nanoscale materials and therefore offer an attractive sensing platform for biological and medical applications. Here we investigate the lasing characteristics, i.e., the threshold and slope efficiency, as a function of the grating depth in OSSL devices with distributed feedback (DFB) structure fabricated using photoresists. Two types of photoresists were used for the DFB structures: a negative photoresist, SU-8 2002, and a positive photoresist, ma-P 1275...
October 5, 2016: Scientific Reports
Matthias Klemm, Johannes Blum, Dietmar Link, Martin Hammer, Jens Haueisen, Dietrich Schweitzer
Fluorescence lifetime imaging ophthalmoscopy (FLIO) is a new technique to detect changes in the human retina. The autofluorescence decay over time, generated by endogenous fluorophores, is measured in vivo. The strong autofluorescence of the crystalline lens, however, superimposes the intensity decay of the retina fluorescence, as the confocal principle is not able to suppress it sufficiently. Thus, the crystalline lens autofluorescence causes artifacts in the retinal fluorescence lifetimes determined from the intensity decays...
September 1, 2016: Biomedical Optics Express
Ngo Bich Nga Nathalie Tran, Fanny Knorr, Wing Cheung Mak, Kwan Yee Cheung, Heike Richter, Martina Meinke, Jürgen Lademann, Alexa Patzelt
Hair follicle research is currently focused on the development of drug-loaded nanocarriers for the targeting of follicular structures in the treatment of skin and hair follicle-related disorders. In the present study, a dual-label nanocarrier system was implemented in which FITC-labeled BSA hydrogel nanocarriers loaded with the model drug and dye TRITC-dextran were applied topically to porcine ear skin. Follicular penetration and the distribution of both dyes corresponding to the nanocarriers and the model drug in the follicular ducts subsequent to administration to the skin were investigated using confocal laser scanning microscopy...
September 29, 2016: European Journal of Pharmaceutics and Biopharmaceutics
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