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https://www.readbyqxmd.com/read/28738156/coherent-random-lasing-from-the-dye-aggregates-in-pdms-thin-film
#1
Lihua Ye, Yangyang Feng, Zhixiang Cheng, Chunlei Wang, Changgui Lu, Yan-Qing Lu, YiPing Cui
The coherent random laser (CRL) from dye doped polydimethylsiloxane (PDMS) has been investigated in both nanoparticles (NPs) doped thin film and pure dye thin film. Compared with the other works, the pump threshold is only 1.5 mJ/cm2 in the pure dye thin film with a low dye concentration. The micro-nano crystals of Pyrromethene 597 (PM597) dye spontaneously formed support both gain and random feedback in the bulk of the PDMS during the sample preparation. When the SiO2 NPs was doped, the pump threshold was reduced to 0...
July 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28737290/integration-of-ir-808-sensitized-upconversion-nanostructure-and-mos2-nanosheet-for-808-nm-nir-light-triggered-phototherapy-and-bioimaging
#2
Jiating Xu, Arif Gulzar, Yuhui Liu, Huiting Bi, Shili Gai, Bin Liu, Dan Yang, Fei He, Piaoping Yang
Near infrared (NIR) light triggered phototherapy including photothermal therapy (PTT) and photodynamic therapy (PDT) affords superior outcome in cancer treatment. However, the reactive oxygen species (ROS) generated by NIR-excited upconversion nanostructure is limited by the feeble upconverted light which cannot activate PDT agents efficiently. Here, an IR-808 dye sensitized upconversion nanoparticle (UCNP) with a chlorin e6 (Ce6)-functionalized silica layer is developed for PDT agent. The two booster effectors (dye-sensitization and core-shell enhancement) synergistically amplify the upconversion efficiency, therefore achieving superbright visible emission under low 808 nm light excitation...
July 24, 2017: Small
https://www.readbyqxmd.com/read/28728188/diagnosing-choroidal-neovascularization-in-asymptomatic-individuals-using-optical-coherence-tomography-angiography
#3
Michael M Park, Carl B Rebhun, Emily D Cole, Ricardo N Louzada, Eduardo A Novais, Fareed Rifai, A Yasin Alibhai, Jay S Duker, Nadia K Waheed
Optical coherence tomography angiography (OCTA) is a noninvasive, rapid imaging technique that generates angiographic images without intravenous dye injections. Cross-sectional studies have described the presence of asymptomatic choroidal neovascularization (CNV) in patients with intermediate age-related macular degeneration (AMD). This case report describes the OCT features on longitudinal follow-up of a patient who started with unilateral asymptomatic CNV and eventually developed symptomatic exudative AMD...
July 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28728177/porcine-collagen-transconjunctival-wound-closure-system-for-microincisional-vitrectomy-surgery
#4
Tiffany A Chen, Peter K Kaiser, Rainer Fasching, Darius M Moshfeghi
BACKGROUND AND OBJECTIVE: Microincisional vitrectomy surgery has improved outcomes for vitrectomies; however, wound closure complications remain an important concern. The authors introduce a technique to improve transconjunctival wound closure in vitrectomy surgery. PATIENTS AND METHODS: The authors evaluated the efficacy of porcine collagen plugs on stopping leakage from sclerotomy test sites in vitro and in vivo and assessed wound site healing with histology samples...
July 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28715402/fluorescent-dye-labeling-of-erythrocytes-and-leukocytes-for-studying-the-flow-dynamics-in-mouse-retinal-circulation
#5
Rupesh Agrawal, Praveen Kumar Balne, Sai Bo Bo Tun, Yeo Sia Wey, Neha Khandelwal, Veluchamy A Barathi
The retinal and choroidal blood flow dynamics may provide insight into the pathophysiology and sequelae of various ocular diseases, such as glaucoma, diabetic retinopathy, age-related macular degeneration (AMD) and other ocular inflammatory conditions. It may also help to monitor the therapeutic responses in the eye. The proper labeling of the blood cells, coupled with live-cell imaging of the labeled cells, allows for the investigation of the flow dynamics in the retinal and choroidal circulation. Here, we describe the standardized protocols of 1...
July 3, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28708381/microfabrication-of-monolithic-microfluidic-platforms-using-low-temperature-co-fired-ceramics-suitable-for-fluorescence-imaging
#6
Pedro Couceiro, Julián Alonso-Chamarro
In this work, the influence of laser ablation and lamination parameters in the fabrication of embedded microstructures using Low Temperature Co-Fired Ceramics, have been studied. First, the influence of laser ablation parameters in the dimensions of fabricated microchannels in Low Temperature Co-Fired Ceramics substrates was characterized and strategies for tailoring the microchannels aspect ratios are described. The influence of lamination conditions on the fabrication of monolithically embedded microstructures is presented...
July 14, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28704573/modulation-of-mitochondriotropic-properties-of-cyanine-dyes-by-in-organello-copper-free-click-reaction
#7
Inka Negwer, Markus Hirsch, Stefka Kaloyanova, Tom Brown, Kalina Peneva, Hans-Jürgen Butt, Kaloian Koynov, Mark Helm
Cyanine dyes show a general propensity to localize to polarized mitochondria. This mitochondriotropism was used to perform a copper-free click reaction in the mitochondria of living cells. The in organello reaction of a Cy3 and Cy5 dye led to a product that was easily traceable by Förster resonance energy transfer (FRET). As determined by confocal laser scanning microscopy, the Cy3-Cy5 conjugate showed enhanced retention in mitochondria as compared to the starting compounds. This enhancement of a favorable property can be achieved by synthesis in organello but not outside mitochondria...
July 13, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/28702841/comparison-of-ketamine-and-ketofol-for-deep-sedation-and-analgesia-in-children-undergoing-laser-procedure
#8
Marija Stevic, Nina Ristic, Ivana Budic, Nebojsa Ladjevic, Branislav Trifunovic, Ivan Rakic, Marko Majstorovic, Ivana Burazor, Dusica Simic
The aim of our study was to research and evaluate cardiovascular and respiratory stability, clinical efficacy, and safety of two different anesthetic agents in pediatric patients who underwent Pulse dye (wavelength 595 nm, pulse duration 0-40 ms, power 0-40 J) and CO2 (wavelength 10,600 nm, intensity-fraxel mod with SX index 4 to 8, power 0-30 W) laser procedure. This prospective non-blinded study included 203 pediatric patients ASA I-II, aged between 1 month and 12 years who underwent short-term procedural sedation and analgesia for the laser procedure...
July 12, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28696529/fast-dynamic-visualizations-in-microfluidics-enabled-by-fluorescent-carbon-nanodots
#9
Yi Huang, Lian Xiao, Tingting An, Wenxiang Lim, Teckneng Wong, Handong Sun
Microfluidic systems have become a superior platform for explorations of fascinating fluidic physics at microscale as well as applications in biomedical devices, chemical reactions, drug delivery, etc. Exploitations of this platform are built upon the fundamental techniques of flow visualizations. However, the currently employed fluorescent materials for microfluidic visualization are far from satisfaction, which severely hinders their widespread applications. Here fluorescent carbon nanodots are documented as a game-changer, applicable in versatile fluidic environment for the visualization in microfluidics with unprecedented advantages...
July 11, 2017: Small
https://www.readbyqxmd.com/read/28696476/on-the-origin-of-the-driving-force-in-the-marangoni-propelled-gas-bubble-trapping-mechanism
#10
A Miniewicz, C Quintard, H Orlikowska, S Bartkiewicz
Gas bubbles can be trapped and then manipulated with laser light. In this report, we propose the detailed optical trapping mechanism of gas bubbles confined inside a thin light-absorbing liquid layer between two glass plates. The necessary condition of bubble trapping in this case is the direct absorption of light by the solution containing a dye. Due to heat release, fluid whirls propelled by the surface Marangoni effect at the liquid/gas interface emerge and extend to large distances. We report the experimental microscopic observation of the origin of whirls at an initially flat liquid/air interface as well as at the curved interface of a liquid/gas bubble and support this finding with advanced numerical simulations using the finite element method within the COMSOL Multiphysics platform...
July 11, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28692322/the-use-of-lasers-in-the-treatment-of-skin-cancer-a-review
#11
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/28679262/laser-driven-resonance-of-dye-doped-oil-coated-microbubbles-experimental-study
#12
Guillaume Lajoinie, Jeong-Yu Lee, Joshua Owen, Pieter Kruizinga, Nico de Jong, Gijs van Soest, Eleanor Stride, Michel Versluis
Photoacoustic (PA) imaging offers several attractive features as a biomedical imaging modality, including excellent spatial resolution and functional information such as tissue oxygenation. A key limitation, however, is the contrast to noise ratio that can be obtained from tissue depths greater than 1-2 mm. Microbubbles coated with an optically absorbing shell have been proposed as a possible contrast agent for PA imaging, offering greater signal amplification and improved biocompatibility compared to metallic nanoparticles...
June 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28676850/current-therapeutic-approach-to-hypertrophic-scars
#13
REVIEW
Zrinka Bukvić Mokos, Anamaria Jović, Lovorka Grgurević, Ivo Dumić-Čule, Krešimir Kostović, Romana Čeović, Branka Marinović
Abnormal scarring and its accompanying esthetic, functional, and psychological sequelae still pose significant challe nges. To date, there is no satisfactory prevention or treatment option for hypertrophic scars (HSs), which is mostly due to not completely comprehending the mechanisms underlying their formation. That is why the apprehension of regular and controlled physiological processes of scar formation is of utmost importance when facing hypertrophic scarring, its pathophysiology, prevention, and therapeutic approach...
2017: Frontiers in Medicine
https://www.readbyqxmd.com/read/28675151/the-relationship-between-retinal-damage-and-current-intensity-in-a-pre-clinical-suprachoroidal-transretinal-stimulation-model-using-a-laser-formed-microporous-electrode
#14
Hiroyuki Kanda, Yukari Nakano, Yasuo Terasawa, Takeshi Morimoto, Takashi Fujikado
Suprachoroidal-transretinal stimulation (STS) is a stimulation method for retinal prostheses. For STS-type retinal prostheses, we developed a new type of stimulating electrode called a femtosecond laser-induced porous electrode (FLiP electrode). To verify the safety of FLiP electrode for STS, we investigated the characteristics of STS-induced retinal injury. Approach: Sixteen eyes of pigmented rabbits were studied in this in vivo study. For each examined eye, we implanted a single-channel FLiP electrode (diameter, 0...
July 4, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28671707/enlargement-of-the-organic-solid-state-dfb-laser-wavelength-tuning-range-by-the-use-of-two-complementary-luminescent-dyes-doped-into-the-host-matrix
#15
Kacper Parafiniuk, Lech Sznitko, Dominika Wawrzynczyk, Andrzej Miniewicz, Jaroslaw Mysliwiec
The spectral tuning range of dye lasers is closely associated with the gain profile provided by the utilized luminescent compound. Here, we present the results of studies aimed at broadening the wavelength tuning range in distributed feedback (DFB) lasers, made up of polymeric layers doped with a mixture of two complementary dyes. We have used the 3-(2,2-dicyanoethenyl)-1-phenyl-4,5-dihydro-1H-pyrazole (DCNP) luminescent dye, showing stimulated emission in its crystalline form, and the Rhodamine 700 (Rh700) laser dye, which is red-shifted in luminescence relative to DCNP, both doped into a poly(methyl methacrylate) (PMMA) host matrix...
July 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28667930/transected-sciatic-nerve-repair-by-diode-laser-protein-soldering
#16
Reza Fekrazad, Omid Mortezai, MirSepehr Pedram, Katayoun Am Kalhori, Khojasteh Joharchi, Korosh Mansoori, Roja Ebrahimi, Fatemeh Mashhadiabbas
BACKGROUND AND OBJECTIVE: Despite advances in microsurgical techniques, repair of peripheral nerve injuries (PNI) is still a major challenge in regenerative medicine. The standard treatment for PNI includes suturing and anasthomosis of the transected nerve. The objective of this study was to compare neurorraphy (nerve repair) using standard suturingto diode laser protein soldering on the functional recovery of transected sciatic nerves. STUDY DESIGN/MATERIALS AND METHODS: Thirty adult male Fischer-344 Wistar rats were randomly assigned to 3 groups: 1...
June 13, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28666728/near-infrared-light-triggered-drug-release-from-a-multiple-lipid-carrier-complex-using-an-all-in-one-strategy
#17
Huipeng Li, Xue Yang, Zhanwei Zhou, Kaikai Wang, Chenzi Li, Hongzhi Qiao, David Oupicky, Minjie Sun
The present study reports a drug delivery system comprising nanostructured lipid carrier (NLCs) within liposomes (Lip-NLCs). This multiple lipid carrier complex features laser-triggered responsive drug release. Both hydrophobic and hydrophilic drugs can be loaded into the same formulation by applying an all-in-one strategy. We hypothesized that if we loaded the hydrophobic near-infrared (NIR) dye IR780 into the liposome phospholipid bilayer, the bilayer would be disrupted by laser irradiation so that drug release would be triggered remotely at the tumor site...
June 27, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28665237/genital-angiokeratomas-of-fordyce-595-nm-variable-pulse-pulsed-dye-laser-treatment
#18
Ján Baumgartner, Mária Šimaljaková
BACKGROUND: Angiokeratoma of Fordyce (AF) are dark red or blue-black papules with scaly surface located on scrotum, labia majora and penis. Though usually asymptomatic, bleeding after mechanical trauma and sexual intercourse may occure. AF should be differentiated from malignant melanoma, angiosarcoma and other pigmented lesions. The treatment, usually asked from patients as the result of anxiety and social embarrassment should be performed in an non-aggresive manner. OBJECTIVES: To determine the safety and effectiveness of 595-nm variable-pulse pulsed dye laser (VPPDL) with Dynamic Cooling Device (DCD) in treatment of AF...
June 30, 2017: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/28665162/the-effect-of-pulsed-dye-laser-on-cutaneous-leishmaniasis-and-its-impact-on-the-dermatology-life-quality-index
#19
Mohamed L Elsaie, Shady M Ibrahim
BACKGROUND AND OBJECTIVE: Cutaneous leishmaniasis is a skin condition of prevalence especially in the Middle Eastern region. The Pulsed dye laser (PDL) has not been thoroughly evaluated for treatment of cutaneous leishmaniasis (CL). We assessed primarily the efficacy of 595nm PDL in the treatment of CL lesions and interpreted its impact on the quality of life of affected patients as measured by the Dermatology Life Quality Index (DLQI). PATIENTS AND METHODS: 25 lesions from 12 patients were treated with a single pass of PDL over the whole lesions to develop a purpuric end point...
June 30, 2017: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/28663919/photothermal-imaging-of-skeletal-muscle-mitochondria
#20
Toru Tomimatsu, Jun Miyazaki, Yutaka Kano, Takayoshi Kobayashi
The morphology and topology of mitochondria provide useful information about the physiological function of skeletal muscle. Previous studies of skeletal muscle mitochondria are based on observation with transmission, scanning electron microscopy or fluorescence microscopy. In contrast, photothermal (PT) microscopy has advantages over the above commonly used microscopic techniques because of no requirement for complex sample preparation by fixation or fluorescent-dye staining. Here, we employed the PT technique using a simple diode laser to visualize skeletal muscle mitochondria in unstained and stained tissues...
June 1, 2017: Biomedical Optics Express
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