keyword
MENU ▼
Read by QxMD icon Read
search

Intense pulse light

keyword
https://www.readbyqxmd.com/read/28315815/self-assembled-photoadditives-in-polyester-films-allow-stop-and-go-chemical-release
#1
Ting Cheng, Richard O'Rorke, Raphael Francois Ortiz, Tay Yee Yan, Eva Hemmer, Fiorenzo Vetrone, Robert S Marks, Terry W J Steele
Near-infrared (NIR) triggered chemical delivery allows on-demand release with the advantage of external tissue stimulation. Bioresorbable polyester poly-L-lactic acid (PLLA) was compounded with photoadditives of neat zinc oxide (ZnO) nanoparticles and 980 → 365 nm LiYF4:Tm(3+), Yb(3+) upconverting nanoparticles (UCNP). Subsequently, neat ZnO and UCNP blended PLLA films of sub-50 μm thickness were knife casted with a hydrophobic small molecule drug mimic, fluorescein diacetate. The PLLA films displayed a 500 times increase in fluorescein diacetate release from the 50 mW NIR irradiated PLLA/photoadditive film compared to non-irradiated PLLA control films...
March 15, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28288450/laser-treatment-of-tattoos-basic-principles
#2
Wolfgang Bäumler
Tattooing has become very popular worldwide during the past decades, and millions of people have one or many tattoos at different anatomical sites. The color of tattoos is mainly black, followed by red, green, blue, and other colors. A part of the tattooed people regret tattooing or have permanent problems with tattoos and therefore seek for tattoo removal. Tattoos consist of solid pigment particles in the skin. Thus, tattoo removal requires fragmentation of these permanently incorporated particles. The gold standard of tattoo removal is laser therapy...
2017: Current Problems in Dermatology
https://www.readbyqxmd.com/read/28276005/the-role-of-photodynamic-therapy-in-acne-an-evidence-based-review
#3
REVIEW
Monica Boen, Joshua Brownell, Priyanka Patel, Maria M Tsoukas
BACKGROUND: Acne vulgaris is a highly prevalent skin disorder that affects almost all adolescents and can persist into adulthood. Photodynamic therapy (PDT) is an emerging treatment for acne that involves the use of a photosensitizer in combination with a light source and oxygen. METHODS: We performed a systematic review of the literature and critically evaluated the studies. Sixty-nine clinical trials, four case reports, and two retrospective studies met the inclusion criteria, and seven of the studies were high quality...
March 8, 2017: American Journal of Clinical Dermatology
https://www.readbyqxmd.com/read/28273922/the-role-of-super-atom-molecular-orbitals-in-doped-fullerenes-in-a-femtosecond-intense-laser-field
#4
Hui Xiong, Benoit Mignolet, Li Fang, Timur Osipov, Thomas J A Wolf, Emily Sistrunk, Markus Gühr, Francoise Remacle, Nora Berrah
The interaction of gas phase endohedral fullerene Ho3N@C80 with intense (0.1-5 × 10(14) W/cm(2)), short (30 fs), 800 nm laser pulses was investigated. The power law dependence of Ho3N@C80(q+), q = 1-2, was found to be different from that of C60. Time-dependent density functional theory computations revealed different light-induced ionization mechanisms. Unlike in C60, in doped fullerenes, the breaking of the cage spherical symmetry makes super atomic molecular orbital (SAMO) states optically active...
December 2017: Scientific Reports
https://www.readbyqxmd.com/read/28272897/magnetic-switching-in-granular-fept-layers-promoted-by-near-field-laser-enhancement
#5
Patrick W Granitzka, Emmanuelle Jal, Loïc Le Guyader, Matteo Savoini, Daniel J Higley, Tianmin Liu, Zhao Chen, Tyler Chase, Hendrik Ohldag, Georgi L Dakovski, William F Schlotter, Sebastian Carron, Matthias C Hoffman, Alexander X Gray, Padraic Shafer, Elke Arenholz, Olav Hellwig, Virat Mehta, Yukiko K Takahashi, Jian Wang, Eric E Fullerton, Joachim Stöhr, Alexander H Reid, Hermann A Dürr
Light-matter interaction at the nanoscale in magnetic materials is a topic of intense research in view of potential applications in next-generation high-density magnetic recording. Laser-assisted switching provides a pathway for overcoming the material constraints of high-anisotropy and high-packing density media, though much about the dynamics of the switching process remains unexplored. We use ultrafast small-angle X-ray scattering at an X-ray free-electron laser to probe the magnetic switching dynamics of FePt nanoparticles embedded in a carbon matrix following excitation by an optical femtosecond laser pulse...
March 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/28272471/dynamics-of-laser-driven-proton-acceleration-exhibited-by-measured-laser-absorptivity-and-reflectivity
#6
J H Bin, K Allinger, K Khrennikov, S Karsch, P R Bolton, J Schreiber
Proton acceleration from nanometer thin foils with intense laser pulses is investigated experimentally. We analyzed the laser absorptivity by parallel monitoring of laser transmissivity and reflectivity with different laser intensities when moving the targets along the laser axis. A direct correlation between laser absorptivity and maximum proton energy is observed. Experimental results are interpreted in analytical estimation, exhibiting a coexistence of plasma expansion and light-sail form of radiation pressure acceleration (RPA-LS) mechanisms during the entire proton acceleration process based on the measured laser absorptivity and reflectivity...
March 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28271882/rate-tunable-stepwise-two-photon-gated-photoresponsive-systems-employing-a-synergetic-interaction-between-transient-biradical-units
#7
Katsuya Mutoh, Yoichi Kobayashi, Takuya Yamane, Takahiro Ikezawa, Jiro Abe
The cooperative interaction between photons and molecules, recently termed as "photosynergetic" effect, is crucial to de-velop advanced photofunctional materials beyond a one-photon reaction of a single chromophore. The two-photon absorp-tion is one of the attractive processes for the efficient utilization of photons. Especially, the nonlinear response of the two-photon absorption process is of interest not only to realize temporal and spatial control of reactions but also to develop the rewritable optical memory media and smart optical devices responding to intensity of light...
March 8, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28269466/heart-activity-monitoring-using-3d-hologram-based-on-smartphone
#8
Tharoeun Thap, Heewon Chung, Jinseok Lee
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/28267751/cost-effectiveness-of-adjunct-non-pharmacological-interventions-for-osteoarthritis-of-the-knee
#9
Beth Woods, Andrea Manca, Helen Weatherly, Pedro Saramago, Eleftherios Sideris, Christina Giannopoulou, Stephen Rice, Mark Corbett, Andrew Vickers, Matthew Bowes, Hugh MacPherson, Mark Sculpher
BACKGROUND: There is limited information on the costs and benefits of alternative adjunct non-pharmacological treatments for knee osteoarthritis and little guidance on which should be prioritised for commissioning within the NHS. This study estimates the costs and benefits of acupuncture, braces, heat treatment, insoles, interferential therapy, laser/light therapy, manual therapy, neuromuscular electrical stimulation, pulsed electrical stimulation, pulsed electromagnetic fields, static magnets and transcutaneous electrical nerve Stimulation (TENS), based on all relevant data, to facilitate a more complete assessment of value...
2017: PloS One
https://www.readbyqxmd.com/read/28263079/%C3%AF-expansive-heteroleptic-ruthenium-ii-complexes-as-reverse-saturable-absorbers-and-photosensitizers-for-photodynamic-therapy
#10
Li Wang, Huimin Yin, Mohammed A Jabed, Marc Hetu, Chengzhe Wang, Susan Monro, Xiaolin Zhu, Svetlana Kilina, Sherri A McFarland, Wenfang Sun
Five heteroleptic tris-diimine ruthenium(II) complexes [RuL(N^N)2](PF6)2 (where L is 3,8-di(benzothiazolylfluorenyl)-1,10-phenanthroline and N^N is 2,2'-bipyridine (bpy) (1), 1,10-phenanthroline (phen) (2), 1,4,8,9-tetraazatriphenylene (tatp) (3), dipyrido[3,2-a:2',3'-c]phenazine (dppz) (4), or benzo[i]dipyrido[3,2-a:2',3'-c]phenazine (dppn) (5), respectively) were synthesized. The influence of π-conjugation of the ancillary ligands (N^N) on the photophysical properties of the complexes was investigated by spectroscopic methods and simulated by density functional theory (DFT) and time-dependent DFT...
March 6, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28256869/search-for-two-photon-interaction-with-axionlike-particles-using-high-repetition-pulsed-magnets-and-synchrotron-x-rays
#11
T Inada, T Yamazaki, T Namba, S Asai, T Kobayashi, K Tamasaku, Y Tanaka, Y Inubushi, K Sawada, M Yabashi, T Ishikawa, A Matsuo, K Kawaguchi, K Kindo, H Nojiri
We report on new results of a search for a two-photon interaction with axionlike particles (ALPs). The experiment is carried out at a synchrotron radiation facility using a "light shining through a wall (LSW)" technique. For this purpose, we develop a novel pulsed-magnet system, composed of multiple racetrack magnets and a transportable power supply. It produces fields of about 10 T over 0.8 m with a high repetition rate of 0.2 Hz and yields a new method of probing a vacuum with high intensity fields. The data obtained with a total of 27 676 pulses provide a limit on the ALP-two-photon coupling constant that is more stringent by a factor of 5...
February 17, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28256362/effect-of-pulsed-laser-light-in-patients-with-dry-eye-syndrome
#12
S Guilloto Caballero, J L García Madrona, E Colmenero Reina
OBJECTIVES: The objective of this study was to determine the clinical benefits of pulsed light therapy for the treatment of Dry Eye Syndrome (DES) due to the decrease in aqueous tear production (aqueous deficient DES) and/or excessive tear evaporation (evaporative DES) due to Meibomian Gland Dysfunction (MGD). METHODS: A study was conducted on 72 eyes corresponding to 36 patients with DES. Out of these 72 eyes, 60 underwent refractive surgery (48 with femtosecond laser, 6 were operated with a mechanical microkeratome, and 6 with refractive photo-keratectomy[RPK], 6 treated with phacoemulsification, and 6 with no previous surgical treatment...
February 28, 2017: Archivos de la Sociedad Española de Oftalmología
https://www.readbyqxmd.com/read/28244084/intense-pulsed-light-combined-with-methyl-aminolaevulinate-for-treating-actinic-keratoses-and-photoaged-skin-of-the-dorsal-hands-has-considerable-advantages-however-is-it-worth-the-extra-expense
#13
https://www.readbyqxmd.com/read/28241577/gouy-phase-shift-for-annular-beam-profiles-in-attosecond-experiments
#14
F Schlaepfer, A Ludwig, M Lucchini, L Kasmi, M Volkov, L Gallmann, U Keller
Attosecond pump-probe measurements are typically performed by combining attosecond pulses with more intense femtosecond, phase-locked infrared (IR) pulses because of the low average photon flux of attosecond light sources based on high-harmonic generation (HHG). Furthermore, the strong absorption of materials at the extreme ultraviolet (XUV) wavelengths of the attosecond pulses typically prevents the use of transmissive optics. As a result, pump and probe beams are typically recombined geometrically with a center-hole mirror that reflects the larger IR beam and transmits the smaller XUV, which leads to an annular beam profile of the IR...
February 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28229231/hair-follicle-changes-following-intense-pulsed-light-axillary-hair-reduction-histometrical-histological-and-immunohistochemical-evaluation
#15
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...
April 2017: Archives of Dermatological Research
https://www.readbyqxmd.com/read/28227716/heart-activity-monitoring-using-3d-hologram-based-on-smartphone
#16
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
#17
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
#18
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
#19
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
#20
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.)
keyword
keyword
11191
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"