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Intense pulsed light

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https://www.readbyqxmd.com/read/28926885/-evaluation-of-short-term-effect-of-intense-pulsed-light-combined-with-meibomian-gland-expression-in-the-treatment-of-meibomian-gland-dysfunction
#1
B Rong, P Tu, Y Tang, R X Liu, W J Song, X M Yan
Objective: To explore short-term effect of intense pulsed light (IPL) combined with meibomian gland expression in treating meibomian gland dysfunction (MGD). Methods: This study was a prospective, randomized, double-masked, controlled study. Forty-four MGD patients were enrolled in the study and received three consecutive IPL treatments with an interval of 4 weeks. One eye of each patient was randomly assigned as the study eye receiving the IPL therapy with an energy of 14-16 J/cm(2), and the fellow eye was as the control eye receiving a placebo therapy with 0 J/cm(2)...
September 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28919243/drugs-do-we-need-them-applications-of-non-pharmaceutical-therapy-in-anterior-eye-disease-a-review
#2
REVIEW
Priyanka Mandal, Mohammad A Khan, Sunil Shah
Natural products have been in use long before the introduction of modern drug therapies and are still used in various communities worldwide for the treatment of anterior eye disease. The aim of this review is to look at the current non-pharmaceutical modalities that have been tried and assess the body of existing evidence behind them. This includes alternative medicine, existing non-pharmaceutical therapy and more recent low and high tech solutions. A detailed search of all available databases including MEDLINE, Pubmed and Google was made to look for English-language studies for complementary and alternative treatment modalities (CAM), natural therapies and new modalities for anterior eye disease such as blepharitis, dry eye and microbial keratitis...
September 14, 2017: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/28915056/gigahertz-optomechanical-modulation-by-split-ring-resonator-nanophotonic-meta-atom-arrays
#3
Yuta Imade, Ronald Ulbricht, Motonobu Tomoda, Osamu Matsuda, Gediminas Seniutinas, Saulius Juodkazis, Oliver B Wright
Using polarization-resolved transient reflection spectroscopy, we investigate the ultrafast modulation of light interacting with a metasurface consisting of coherently vibrating nanophotonic meta-atoms in the form of U-shaped split-ring resonators, that exhibit co-localized optical and mechanical resonances. With a two-dimensional square-lattice array of these resonators formed of gold on a glass substrate, we monitor the visible-pump-pulse induced gigahertz oscillations in intensity of reflected linearly-polarized infrared probe light pulses, modulated by the resonators effectively acting as miniature tuning forks...
September 15, 2017: Nano Letters
https://www.readbyqxmd.com/read/28900751/effect-of-wavelength-and-beam-width-on-penetration-in-light-tissue-interaction-using-computational-methods
#4
Caerwyn Ash, Michael Dubec, Kelvin Donne, Tim Bashford
Penetration depth of ultraviolet, visible light and infrared radiation in biological tissue has not previously been adequately measured. Risk assessment of typical intense pulsed light and laser intensities, spectral characteristics and the subsequent chemical, physiological and psychological effects of such outputs on vital organs as consequence of inappropriate output use are examined. This technical note focuses on wavelength, illumination geometry and skin tone and their effect on the energy density (fluence) distribution within tissue...
September 12, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28889001/decontamination-of-fresh-cut-cucumber-slices-by-a-combination-of-a-modified-chitosan-coating-containing-carvacrol-nanoemulsions-and-pulsed-light
#5
Özge Taştan, Gianpiero Pataro, Francesco Donsì, Giovanna Ferrari, Taner Baysal
In this study, the impact of the combination of pulsed light (PL) treatments with antimicrobial coatings, consisting of modified chitosan suspensions incorporating carvacrol nanoemulsions, was investigated on the decontamination of fresh-cut cucumber slices. The upper surface of the cucumber slices, with or without the coating deposition, was inoculated with Escherichia coli ATCC 26 to reach a final concentration of 10(7)CFU/g of the vegetable. PL treatments were conducted at different fluence (4, 8, and 12J/cm(2)) on the inoculated surface of cucumber slices...
August 16, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28887117/analysis-of-cytokine-levels-in-tears-and-clinical-correlations-after-intense-pulsed-light-treating-meibomian-gland-dysfunction
#6
Ruixing Liu, Bei Rong, Ping Tu, Yun Tang, Wenjing Song, Toyos Rolando, Toyos Melissa, Xiaoming Yan
PURPOSE: To investigate the change from baseline of inflammatory markers in tears of dry eye disease(DED) subjects due to meibomian gland dysfunction(MGD) after IPL(intense pulsed light) treatment and meibomian gland expression(MGE) compared to sham treatment, and the correlations with ocular surface parameters. DESIGN: Randomized, double-masked, controlled study. METHODS: Those randomized into the active treatment arm received 3 consecutive treatments(14∼16J/cm(2)) approximately 4 weeks apart in the periocular region...
September 5, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28884244/lasers-and-intense-pulsed-light-ipl-association-with-cancerous-lesions
#7
Caerwyn Ash, Godfrey Town, Rebecca Whittall, Louise Tooze, Jaymie Phillips
The development and use of light and lasers for medical and cosmetic procedures has increased exponentially over the past decade. This review article focuses on the incidence of reported cases of skin cancer post laser or IPL treatment. The existing evidence base of over 25 years of laser and IPL use to date has not raised any concerns regarding its long-term safety with only a few anecdotal cases of melanoma post treatment over two decades of use; therefore, there is no evidence to suggest that there is a credible cancer risk...
September 7, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28878232/holographic-writing-of-ink-based-phase-conjugate-nanostructures-via-laser-ablation
#8
Muhammad Waqas Khalid, Rajib Ahmed, Ali K Yetisen, Bader AlQattan, Haider Butt
The optical phase conjugation (OPC) through photonic nanostructures in coherent optics involves the utilization of a nonlinear optical mechanism through real-time processing of electromagnetic fields. Their applications include spectroscopy, optical tomography, wavefront sensing, and imaging. The development of functional and personalized holographic devices in the visible and near-infrared spectrum can be improved by introducing cost-effective, rapid, and high-throughput fabrication techniques and low-cost recording media...
September 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28872125/measurements-of-long-range-electronic-correlations-during-femtosecond-diffraction-experiments-performed-on-nanocrystals-of-buckminsterfullerene
#9
Rebecca A Ryan, Sophie Williams, Andrew V Martin, Ruben A Dilanian, Connie Darmanin, Corey T Putkunz, David Wood, Victor A Streltsov, Michael W M Jones, Naylyn Gaffney, Felix Hofmann, Garth J Williams, Sebastien Boutet, Marc Messerschmidt, M Marvin Seibert, Evan K Curwood, Eugeniu Balaur, Andrew G Peele, Keith A Nugent, Harry M Quiney, Brian Abbey
The precise details of the interaction of intense X-ray pulses with matter are a topic of intense interest to researchers attempting to interpret the results of femtosecond X-ray free electron laser (XFEL) experiments. An increasing number of experimental observations have shown that although nuclear motion can be negligible, given a short enough incident pulse duration, electronic motion cannot be ignored. The current and widely accepted models assume that although electrons undergo dynamics driven by interaction with the pulse, their motion could largely be considered 'random'...
August 22, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28831487/light-intensity-field-enhancement-life-induced-localized-edge-abrasion-of-silica-coated-silver-nanoprisms
#10
Rijil Thomas, Soo Zeng Fiona Phua, Sivaramapanicker Sreejith, Yanli Zhao, Cheong Boon Soh
Silver nanoprisms (AgNPrs) exhibit localized surface plasmon resonance (LSPR) in the near infrared (NIR) region of the electromagnetic spectrum. LSPR-driven electric field enhancement around AgNPr edges has been investigated in various studies. A coating of dielectric materials such as silica on the surface of the AgNPrs is employed to extend the application of these nanoparticles under biocompatible conditions and to increase the thermal stability. Upon interactions with optical excitation (pulsed laser excitation), the AgNPrs undergo light intensity field enhancement (LIFE) at the corners...
August 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28831246/general-quality-of-life-of-patients-with-acne-vulgaris-before-and-after-performing-selected-cosmetological-treatments
#11
Karolina Chilicka, Joanna Maj, Bernard Panaszek
BACKGROUND: Achieving a satisfying quality of life for a patient by applying individually matched therapy is, simultaneously, a great challenge and a priority for contemporary medicine. Patients with visible dermatological ailments are particularly susceptible to reduction in the general quality of life. Among the dermatological diseases, acne causes considerable reduction in the quality of life and changes in self-perception that lead to the worsening of a patient's mental condition, including depression and suicidal thoughts...
2017: Patient Preference and Adherence
https://www.readbyqxmd.com/read/28809885/two-photon-absorption-and-subband-photodetection-in-monolayer-mos2
#12
Feng Zhou, Wei Ji
We develop a theoretical model to quantify the two-photon absorption (2 PA) coefficients of monolayer MoS2. Based on two-dimensional excitons, our model reveals the 2 PA coefficient spectrum on the order of 0.01-0.1 cm/MW in the near-infrared for monolayer MoS2. As compared to the band theory for bulk semiconductors, these coefficients are enhanced by at least one order of magnitude. Our model is in agreement with light-intensity-dependent photocurrent measurements on a monolayer MoS2, subband photodetector with femtosecond laser pulses...
August 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28805825/the-processing-and-heterostructuring-of-silk-with%C3%A2-light
#13
Mehra S Sidhu, Bhupesh Kumar, Kamal P Singh
Spider silk is a tough, elastic and lightweight biomaterial, although there is a lack of tools available for non-invasive processing of silk structures. Here we show that nonlinear multiphoton interactions of silk with few-cycle femtosecond pulses allow the processing and heterostructuring of the material in ambient air. Two qualitatively different responses, bulging by multiphoton absorption and plasma-assisted ablation, are observed for low- and high-peak intensities, respectively. Plasma ablation allows us to make localized nanocuts, microrods, nanotips and periodic patterns with minimal damage while preserving molecular structure...
September 2017: Nature Materials
https://www.readbyqxmd.com/read/28799370/nucleation-in-food-colloids
#14
Malcolm J W Povey
Nucleation in food colloids has been studied in detail using ultrasound spectroscopy. Our data show that classical nucleation theory (CNT) remains a sound basis from which to understand nucleation in food colloids and analogous model systems using n-alkanes. Various interpretations and modifications of CNT are discussed with regard to their relevance to food colloids. Much of the evidence presented is based on the ultrasound velocity spectrometry measurements which has many advantages for the study of nucleating systems compared to light scattering and NMR due to its sensitivity at low solid contents and its ability to measure true solid contents in the nucleation and early crystal growth stages...
December 7, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28795984/electrophoto-biomodulation-in-aesthetic-treatment-of-postburn-hypopigmentation-clinical-response-in-relation-to-histopathological-changes
#15
Nader Elmelegy, Dalia Mohamed Mofreh El Sakka
BACKGROUND: Hypopigmentation is a troublesome often-permanent sequelae after burn injury, particularly in dark races. A number of methods have been described to treat this phenomenon. In this work, we are going to study the effect of E light (intensive pulsed light+radiofrequency+cooling) in repigmentation of partial thickness and full thickness burn wounds in adult patients and light microscopic changes of biopsy material at various stages of repigmentation. PATIENTS AND METHODS: In this study, 24 patients with postburn hypopigmentation were selected and E light was used, using different filters, according to the skin color...
September 2017: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/28795742/optical-reconfiguration-and-polarization-control-in-semi-continuous-gold-films-close-to-the-percolation-threshold
#16
Christian Frydendahl, Taavi Repän, Mathias Geisler, Sergey M Novikov, Jonas Beermann, Andrei V Lavrinenko, Sanshui Xiao, Sergey I Bozhevolnyi, N Asger Mortensen, Nicolas Stenger
Controlling and confining light by exciting plasmons in resonant metallic nanostructures is an essential aspect of many new emerging optical technologies. Here we explore the possibility of controllably reconfiguring the intrinsic optical properties of semi-continuous gold films, by inducing permanent morphological changes with a femtosecond (fs)-pulsed laser above a critical power. Optical transmission spectroscopy measurements show a correlation between the spectra of the morphologically modified films and the wavelength, polarization, and the intensity of the laser used for alteration...
August 24, 2017: Nanoscale
https://www.readbyqxmd.com/read/28792549/a-fully-general-time-dependent-multiconfiguration-self-consistent-field-method-for-the-electron-nuclear-dynamics
#17
Ryoji Anzaki, Takeshi Sato, Kenichi L Ishikawa
We present a fully general time-dependent multiconfiguration self-consistent-field method to describe the dynamics of a system consisting of arbitrarily different kinds and numbers of interacting fermions and bosons. The total wave function is expressed as a superposition of different configurations constructed from time-dependent spin-orbitals prepared for each particle kind. We derive equations of motion followed by configuration-interaction (CI) coefficients and spin-orbitals for general, not restricted to full-CI, configuration spaces...
August 23, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28791605/laser-and-light-treatments-for-hair-reduction-in-fitzpatrick-skin-types-iv-vi-a-comprehensive-review-of-the-literature
#18
REVIEW
Rachel A Fayne, Marina Perper, Ariel E Eber, Adam S Aldahan, Keyvan Nouri
Unwanted facial and body hair presents as a common finding in many patients, such as females with hirsutism. With advances in laser and light technology, a clinically significant reduction in hair can be achieved in patients with light skin. However, in patients with darker skin, Fitzpatrick skin types (FST) IV-VI, the higher melanin content of the skin interferes with the proposed mechanism of laser-induced selective photothermolysis, which is to target the melanin in the hair follicle to cause permanent destruction of hair bulge stem cells...
August 8, 2017: American Journal of Clinical Dermatology
https://www.readbyqxmd.com/read/28790801/intense-pulsed-light-for-evaporative-dry-eye-disease
#19
REVIEW
Steven J Dell
There is a clear association between dry eye disease (DED) and skin inflammatory diseases occurring in close proximity to the eyelids, such as facial skin rosacea. Intense pulsed light (IPL) is widely accepted as a treatment for skin rosacea. A number of recent studies demonstrated that, in patients suffering from meibomian gland dysfunction (MGD), IPL therapy also reduces signs and symptoms of DED. Despite these encouraging results, in the context of DED and MGD, the mechanisms of action of IPL are not well understood...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28774755/human-seasonal-and-circadian-studies-in-antarctica-halley-75%C3%A2-s
#20
Josephine Arendt, Benita Middleton
Living for extended periods in Antarctica exposes base personnel to extremes of daylength (photoperiod) and temperature. At the British Antarctic Survey base of Halley, 75°S, the sun does not rise for 110d in the winter and does not set for 100d in summer. Photoperiod is the major time cue governing the timing of seasonal events such as reproduction in many species. The neuroendocrine signal providing photoperiodic information to body physiology is the duration of melatonin secretion which reflects the length of the night: longer in the short days of winter and shorter in summer...
August 1, 2017: General and Comparative Endocrinology
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