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Intense pulsed light

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https://www.readbyqxmd.com/read/28229231/hair-follicle-changes-following-intense-pulsed-light-axillary-hair-reduction-histometrical-histological-and-immunohistochemical-evaluation
#1
Moetaz El-Domyati, Wael Hosam, Noha H Moftah, Hamza Abdel Raouf, Selwet M Saad
Intense pulsed light (IPL) has been used for years in hair reduction; however, no previous studies discussed quantitative histological and immunohistochemical changes of hair follicles after IPL. Accordingly, this study aims to objectively quantify histological and immunohistochemical changes of hair follicles after IPL hair reduction. Right axillae of 21 volunteers were subjected to 6 IPL sessions using Quanta system IPL and evaluated at 1 week and 1 month after last session (i.e., 3 and 4 months from the start of treatment, respectively) in comparison to baseline and left control axillae...
February 22, 2017: Archives of Dermatological Research
https://www.readbyqxmd.com/read/28227716/heart-activity-monitoring-using-3d-hologram-based-on-smartphone
#2
Tharoeun Thap, Heewon Chung, Jinseok Lee, Tharoeun Thap, Heewon Chung, Jinseok Lee, Tharoeun Thap, Jinseok Lee, Heewon Chung
In this paper, we used smartphone to obtained pulsatile signal from a fingertip by illuminating the skin tissue using flashlight and with an on-board camera to record the change of the light intensity reflected from the tissue. The pulsatile signal is produced by analyzing average green component values of the frames taken by the camera and the heart rate is estimated in real time by detecting the pulse peaks. Based on each instant obtained heartbeat, we design a heart animation that beats according to each interval of the heartbeat...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28223745/intense-pulsed-light-alone-and-in-combination-with-erbium-yttrium-aluminum-garnet-laser-on-small-to-medium-sized-congenital-melanocytic-nevi-single-center-experience-based-on-retrospective-chart-review
#3
Mi So Lee, Hee Jin Jun, Sang Hyun Cho, Jeong Deuk Lee, Hei Sung Kim
BACKGROUND: Treatment of congenital melanocytic nevi (CMN) with intense pulsed light (IPL) has recently produced promising results. OBJECTIVE: To evaluate the clinical and histological outcomes of small-to-medium sized CMN treated with IPL alone and in combination with erbium: yttrium-aluminum-garnet (Er: YAG) laser. METHODS: We performed a retrospective chart review of 26 small-to-medium sized CMN treated as described above. The reduction in visible pigmentation, signs of recurrence and any adverse skin changes were evaluated by two independent clinicians...
February 2017: Annals of Dermatology
https://www.readbyqxmd.com/read/28220602/mexametric-and-cutometric-assessment-of-the-signs-of-aging-of-the-skin-area-around-the-eyes-after-the-use-of-non-ablative-fractional-laser-non-ablative-radiofrequency-and-intense-pulsed-light
#4
Anna Maria Kołodziejczak, Helena Rotsztejn
The assessment of the signs of aging within eyes area in cutometric (skin elasticity) and mexametric (discoloration and severity of erythema) examination after the treatment with: non-ablative fractional laser, non-ablative radiofrequency (RF) and intense light source (IPL). This study included 71 patients, aged 33-63 years (the average age was 45.81) with Fitzpatrick skin type II and III. 24 patients received 5 successive treatment sessions with a 1,410-nm non-ablative fractional laser in two-week intervals, 23 patients received 5 successive treatment sessions with a non-ablative RF in one-week intervals and 24 patients received 5 successive treatment sessions with an IPL in two-week intervals...
February 21, 2017: Dermatologic Therapy
https://www.readbyqxmd.com/read/28219998/intensity-dependences-of-the-nonlinear-optical-excitation-of-plasmons-in-graphene
#5
T J Constant, S M Hornett, D E Chang, E Hendry
Recently, we demonstrated an all-optical coupling scheme for plasmons, which takes advantage of the intrinsic nonlinear optical response of graphene. Frequency mixing using free-space, visible light pulses generates surface plasmons in a planar graphene sample, where the phase matching condition can define both the wavevector and energy of surface waves and intraband transitions. Here, we also show that the plasmon generation process is strongly intensity-dependent, with resonance features washed out for absorbed pulse fluences greater than 0...
March 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28217715/sensitivity-of-photoelectron-diffraction-to-conformational-changes-of-adsorbed-molecules-tetra-tert-butyl-azobenzene-au-111
#6
A Schuler, M Greif, A P Seitsonen, G Mette, L Castiglioni, J Osterwalder, M Hengsberger
Electron diffraction is a standard tool to investigate the atomic structure of surfaces, interfaces, and adsorbate systems. In particular, photoelectron diffraction is a promising candidate for real-time studies of structural dynamics combining the ultimate time resolution of optical pulses and the high scattering cross-sections for electrons. In view of future time-resolved experiments from molecular layers, we studied the sensitivity of photoelectron diffraction to conformational changes of only a small fraction of molecules in a monolayer adsorbed on a metallic substrate...
January 2017: Structural Dynamics (Melville, N.Y.)
https://www.readbyqxmd.com/read/28202732/atomic-structure-of-granulin-determined-from-native-nanocrystalline-granulovirus-using-an-x-ray-free-electron-laser
#7
Cornelius Gati, Dominik Oberthuer, Oleksandr Yefanov, Richard D Bunker, Francesco Stellato, Elaine Chiu, Shin-Mei Yeh, Andrew Aquila, Shibom Basu, Richard Bean, Kenneth R Beyerlein, Sabine Botha, Sébastien Boutet, Daniel P DePonte, R Bruce Doak, Raimund Fromme, Lorenzo Galli, Ingo Grotjohann, Daniel R James, Christopher Kupitz, Lukas Lomb, Marc Messerschmidt, Karol Nass, Kimberly Rendek, Robert L Shoeman, Dingjie Wang, Uwe Weierstall, Thomas A White, Garth J Williams, Nadia A Zatsepin, Petra Fromme, John C H Spence, Kenneth N Goldie, Johannes A Jehle, Peter Metcalf, Anton Barty, Henry N Chapman
To understand how molecules function in biological systems, new methods are required to obtain atomic resolution structures from biological material under physiological conditions. Intense femtosecond-duration pulses from X-ray free-electron lasers (XFELs) can outrun most damage processes, vastly increasing the tolerable dose before the specimen is destroyed. This in turn allows structure determination from crystals much smaller and more radiation sensitive than previously considered possible, allowing data collection from room temperature structures and avoiding structural changes due to cooling...
February 15, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28199463/effect-of-methyl-aminolevulinate-photodynamic-therapy-with-and-without-ablative-fractional-laser-treatment-in-patients-with-microinvasive-squamous-cell-carcinoma-a-randomized-clinical-trial
#8
Seung-Hwan Choi, Ki-Ho Kim, Ki-Hoon Song
Importance: Surgical excision is the standard treatment for cutaneous squamous cell carcinoma (SCC). However, microinvasive SCC (Clark level II) is limited to the papillary dermis, and it should be differentiated from invasive SCC. Ablative fractional laser-primed photodynamic therapy (AFL-PDT) may have enhanced efficacy. Objective: To compare 1 session of AFL-PDT with 2 sessions of conventional methyl aminolevulinate-PDT (MAL-PDT) for the treatment of microinvasive SCC...
February 15, 2017: JAMA Dermatology
https://www.readbyqxmd.com/read/28195278/influence-of-the-excitation-light-intensity-on-the-rate-of-fluorescence-quenching-reactions-pulsed-experiments
#9
Gonzalo Angulo, Jadwiga Milkiewicz, Daniel Kattnig, Michał Nejbauer, Yuriy Stepanenko, Jan Szczepanek, Czesław Radzewicz, Paweł Wnuk, Günter Grampp
The effect of multiple light excitation events on bimolecular photo-induced electron transfer reactions in liquid solution is studied experimentally. It is found that the decay of fluorescence can be up to 25% faster if a second photon is absorbed after a first cycle of quenching and recombination. A theoretical model is presented which ascribes this effect to the enrichment of the concentration of quenchers in the immediate vicinity of fluorophores that have been previously excited. Despite its simplicity, the model delivers a qualitative agreement with the observed experimental trends...
February 14, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28176823/volumetric-spatial-correlations-of-neurovascular-coupling-studied-using-single-pulse-opto-fmri
#10
Isabel N Christie, Jack A Wells, Sergey Kasparov, Alexander V Gourine, Mark F Lythgoe
Neurovascular coupling describes the link between neuronal activity and cerebral blood flow. This relationship has been the subject of intense scrutiny, with most previous work seeking to understand temporal correlations that describe neurovascular coupling. However, to date, the study of spatial correlations has been limited to two-dimensional mapping of neuronal or vascular derived signals emanating from the brain's surface, using optical imaging techniques. Here, we investigate spatial correlations of neurovascular coupling in three dimensions, by applying a single 10 ms pulse of light to trigger optogenetic activation of cortical neurons transduced to express channelrhodopsin2, with concurrent fMRI...
February 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28164458/comparison-of-hair-removal-efficacy-and-side-effect-of-neodymium-yttrium-aluminum-garnet-laser-and-intense-pulsed-light-systems-18-month-follow-up
#11
Georgina Zita Szima, Eszter Anna Janka, Anikó Kovács, Blanka Bortély, Edina Bodnár, Irina Sawhney, Éva Szabó, Éva Remenyik
BACKGROUND: Photothermal destruction of hair shaft melanin with intense pulsed light (IPL) and neodymium:yttrium-aluminum-garnet (Nd:YAG) laser has become an effective treatment of hair removal. AIMS: Our aim was to compare efficacy, satisfactory levels, safety, and side effects of Nd:YAG and IPL in hair reduction. METHODS: This was a prospective randomized intrapatient, right-left, assessor-blinded comparison of Nd:YAG vs IPL. There were 38 volunteers recruited...
February 6, 2017: Journal of Cosmetic Dermatology
https://www.readbyqxmd.com/read/28163457/near-infrared-pulsed-light-for-permanent-hair-reduction-in-fitzpatrick-skin-types-iv-and-v
#12
Pratik Thacker, Pramod Kumar
BACKGROUND: Excessive hair on the face is a significant cause for distress amongst women. Permanent hair reduction methods including lasers and pulsed light devices are increasingly being used. AIMS: The aim of this study is to evaluate the efficacy and safety of near infrared pulsed light source for permanent hair reduction in women seeking treatment for excessive hair growth on the upper lip and chin. SETTINGS AND DESIGN: This was a prospective observational study done at a tertiary care hospital in South India...
October 2016: Journal of Cutaneous and Aesthetic Surgery
https://www.readbyqxmd.com/read/28157369/perturbative-high-harmonic-wave-front-control
#13
Zhengyan Li, Graham Brown, Dong Hyuk Ko, Fanqi Kong, Ladan Arissian, P B Corkum
We pattern the wave front of a high harmonic beam by intersecting the intense driving laser pulse that generates the high harmonic with a weak control pulse. To illustrate the potential of wave-front control, we imprint a Fresnel zone plate pattern on a harmonic beam, causing the harmonics to focus and defocus. The quality of the focus that we achieve is measured using the spectral wave-front optical reconstruction by diffraction method. We will show that it is possible to enhance the peak intensity by orders of magnitude without a physical optical element in the path of the extreme ultraviolet (XUV) beam...
January 20, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28146354/selective-light-induced-patterning-of-carbon-nanotube-silver-nanoparticle-composite-to-produce-extremely-flexible-conductive-electrodes
#14
Inhyuk Kim, Kyoohee Woo, Zhaoyang Zhong, Eonseok Lee, Dongwoo Kang, Sunho Jeong, Young-Man Choi, Yunseok Jang, Sin Kwon, Jooho Moon
Recently, highly flexible conductive features have been widely demanded for the development of various electronic applications, such as foldable displays, deformable lighting, disposable sensors, and flexible batteries. Herein, we report for the first time a selective photonic sintering-derived, highly reliable patterning approach for creating extremely flexible carbon nanotube (CNT)/silver nanoparticle (Ag NP) composite electrodes that can tolerate severe bending (20 000 cycles at a bending radius of 1 mm)...
February 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28125779/monolayer-ws2-nanopores-for-dna-translocation-with-light-adjustable-sizes
#15
Gopinath Danda, Paul Masih Das, Yung-Chien Chou, Jerome T Mlack, William M Parkin, Carl H Naylor, Kazunori Fujisawa, Tianyi Zhang, Laura Beth Fulton, Mauricio Terrones, Alan T Charlie Johnson, Marija Drndić
Two-dimensional materials are promising for a range of applications, as well as testbeds for probing the physics of low-dimensional systems. Tungsten disulfide (WS2) monolayers exhibit a direct band gap and strong photoluminescence (PL) in the visible range, opening possibilities for advanced optoelectronic applications. Here, we report the realization of two-dimensional nanometer-size pores in suspended monolayer WS2 membranes, allowing for electrical and optical response in ionic current measurements. A focused electron beam was used to fabricate nanopores in WS2 membranes suspended on silicon-based chips and characterized using PL spectroscopy and aberration-corrected high-resolution scanning transmission electron microscopy...
February 1, 2017: ACS Nano
https://www.readbyqxmd.com/read/28122416/gain-with-no-pain-pain-management-in-dermatological-photodynamic-therapy
#16
REVIEW
B Wang, L Shi, Y F Zhang, Q Zhou, J Zheng, R M Szeimies, X L Wang
Pain during photodynamic therapy (PDT) is the main limiting adverse effect in its use in dermatology. Given its multifactorial nature, we reviewed both intrinsic and extrinsic factors that are involved in PDT pain. We proposed a threshold theory for pain experience in PDT: it positively correlates with fluence rate and dose below certain threshold (rate of ~60 mW/cm(2) , dose of ~50 J/cm(2) ); when threshold is surpassed, pain intensity no longer increases. Additionally, we carefully compared recent updates on pain management strategies and we suggested that cold air analgesia and low-irradiance light source (such as intense pulsed light and day-light PDTs) represent the current best analgesic options...
January 25, 2017: British Journal of Dermatology
https://www.readbyqxmd.com/read/28122296/comparative-analysis-of-mutant-plants-impaired-in-the-main-regulatory-mechanisms-of-photosynthetic-light-reactions-from-biophysical-measurements-to-molecular-mechanisms
#17
Mikko Tikkanen, Sanna Rantala, Michele Grieco, Eva-Mari Aro
Chlorophyll (chl) fluorescence emission by photosystem II (PSII) and light absorption by P700 reaction center chl a of photosystem I (PSI) provide easy means to probe the function of the photosynthetic machinery. The exact relationship between the measured optical variables and the molecular processes have, however, remained elusive. Today, the availability of mutants with distinct molecular characterization of photosynthesis regulatory processes should make it possible to gain further insights into this relationship, yet a systematic comparative analysis of such regulatory mutants has been missing...
January 17, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28121246/associations-of-objectively-measured-physical-activity-and-sedentary-time-with-arterial-stiffness-in-pre-pubertal-children
#18
Eero A Haapala, Juuso Väistö, Aapo Veijalainen, Niina Lintu, Petri Wiklund, Kate Westgate, Ulf Ekelund, Virpi Lindi, Soren Brage, Timo A Lakka
PURPOSE: To investigate the relationships of objectively measured physical activity (PA) and sedentary time (ST) to arterial stiffness in pre-pubertal children. METHOD: Altogether 136 children (57 boys, 79 girls) aged 6-8-years participated in the study. Stiffness index (SI) was assessed by pulse contour analysis based on photoplethysmography. ST, light PA, moderate PA, and vigorous PA were assessed using combined acceleration and heart rate monitoring. We investigated the associations of ST (<1...
January 25, 2017: Pediatric Exercise Science
https://www.readbyqxmd.com/read/28106423/amplification-of-relativistic-electron-bunches-by-acceleration-in-laser-fields
#19
J Braenzel, A A Andreev, F Abicht, L Ehrentraut, K Platonov, M Schnürer
Direct acceleration of electrons in a coherent, intense light field is revealed by a remarkable increase of the electron number in the MeV energy range. Laser irradiation of thin polymer foils with a peak intensity of ∼1×10^{20}  W/cm^{2} releases electron bunches along the laser propagation direction that are postaccelerated in the partly transmitted laser field. They are decoupled from the laser field at high kinetic energies, when a second foil target at an appropriate distance prevents their subsequent deceleration in the declining laser field...
January 6, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28098455/angular-dependence-of-ionization-by-circularly-polarized-light-calculated-with-time-dependent-configuration-interaction-with-an-absorbing-potential
#20
Paul Hoerner, H Bernhard Schlegel
The angular dependence of ionization by linear and circularly polarized light has been examined for N2, NH3, H2O, CO2, CH2O, pyrazine, methyloxirane, and vinyloxirane. Time-dependent configuration interaction with single excitations and a complex absorbing potential was used to simulate ionization by a seven cycle 800 nm cosine squared pulse with intensities ranging from 0.56 × 10(14) to 5.05 × 10(14) W cm(-2). The shapes of the ionization yield for linearly polarized light can be understood primarily in terms of the nodal structure of the highest occupied orbitals...
February 3, 2017: Journal of Physical Chemistry. A
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