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https://www.readbyqxmd.com/read/29352492/variability-of-pulsed-energy-outputs-from-three-dermatology-lasers-during-multiple-simulated-treatments
#1
J Britton
BACKGROUND: Dermatology laser treatments are undertaken at regional departments using lasers of different powers and wavelengths. In order to achieve good outcomes there need to be good consistency of laser output across different weeks as it is custom and practice to break down the treatments into individual fractions. Departments will also collect information from test patches to help decide on the most appropriate treatment parameters for individual patients. OBJECTIVES: The objective of these experiments is to assess the variability of the energy outputs from a small number of lasers across multiple weeks at realistic parameters...
January 20, 2018: Photodermatology, Photoimmunology & Photomedicine
https://www.readbyqxmd.com/read/29349520/experimental-study-of-5-fluorouracil-encapsulated-ethosomes-combined-with-co2-fractional-laser-to-treat-hypertrophic-scar
#2
Zhen Zhang, Jun Chen, Jun Huang, Yan Wo, Yixin Zhang, Xiangdong Chen
OBJECTIVE: This study is designed to explore permeability of ethosomes encapsulated with 5-florouracil (5-FU) mediated by CO2 fractional laser on hypertrophic scar tissues. Moreover, therapeutic and duration effect of CO2 fractional laser combined with 5-FU encapsulated ethosomes in rabbit ear hypertrophic scar model will be evaluated. METHODS: The permeated amount of 5-FU and retention contents of 5-FU were both determined by high-performance liquid chromatography (HPLC)...
January 18, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29347549/multiscale-permutation-entropy-analysis-of-laser-beam-wandering-in-isotropic-turbulence
#3
Felipe Olivares, Luciano Zunino, Damián Gulich, Darío G Pérez, Osvaldo A Rosso
We have experimentally quantified the temporal structural diversity from the coordinate fluctuations of a laser beam propagating through isotropic optical turbulence. The main focus here is on the characterization of the long-range correlations in the wandering of a thin Gaussian laser beam over a screen after propagating through a turbulent medium. To fulfill this goal, a laboratory-controlled experiment was conducted in which coordinate fluctuations of the laser beam were recorded at a sufficiently high sampling rate for a wide range of turbulent conditions...
October 2017: Physical Review. E
https://www.readbyqxmd.com/read/29346801/early-gene-expression-profile-in-retinal-ganglion-cell-layer-after-optic-nerve-crush-in-mice
#4
Satoru Ueno, Azusa Yoneshige, Yoshiki Koriyama, Man Hagiyama, Yoshikazu Shimomura, Akihiko Ito
Purpose: Optic nerve crush (ONC) induces retinal ganglion cell (RGC) death, which causes vision loss in glaucoma. To investigate early events leading to apoptosis of RGCs, we performed gene expression analysis of injured retinas in the period before RGC loss. Methods: The temporal changes of gene profiles at 0, 1, and 4 days after ONC were determined by DNA microarray. To verify the gene expression changes in RGCs, we enriched RGCs by laser-captured microdissection and performed real-time RT-PCR of 14 selected genes...
January 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29344855/protocol-for-the-analysis-of-laser-capture-microdissected-fresh-frozen-tissue-homogenates-by-silver-stained-1d-sds-page
#5
DaRue A Prieto, Gordon Whitely, Donald J Johann, Josip Blonder
The heterogeneity present in solid tumors adds significant difficulty to scientific analysis and improved understanding. Fundamentally, solid tumor formation consists of cancer cells proper along with stromal elements. The burgeoning malignant process is dependent upon modified stromal elements. Collectively, the stroma forms an essential microenvironment, which is indispensable for the survival and growth of the malignant neoplasm. This cellular heterogeneity makes molecular profiling of solid tumors via mass spectrometry (MS)-based proteomics a daunting task...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29344484/adenocarcinoma-of-the-retinal-pigment-epithelium-arising-in-conjunction-with-late-recurrence-and-systemic-metastasis-of-retinoblastoma
#6
Kelsey Roelofs, Femida Kherani, Laurie Russell, J Godfrey Heathcote, Ezekiel Weis
In 1974, an 8-month-old male was diagnosed with bilateral retinoblastoma. His left eye was enucleated, while the right eye was salvaged with a combination of external beam radiotherapy (4,000 cGy total, divided in 20 fractions) and retinal laser treatment. Thirty-nine years later, he developed intraocular recurrence of retinoblastoma with extrascleral spread. Histopathological examination also identified a second distinct malignancy, retinal pigment epithelium adenocarcinoma, arising in continuity with the retinoblastoma...
November 2017: Ocular Oncology and Pathology
https://www.readbyqxmd.com/read/29344315/a-topical-anti-inflammatory-healing-regimen-utilizing-conjugated-linolenic-acid-for-use-post-ablative-laser-resurfacing-of-the-face-a-randomized-controlled-trial
#7
Douglas C Wu, Mitchel P Goldman
Background: Fractionated, ablative lasers are usually associated with post-treatment erythema, edema, and crusting, which can last from 5 to 14 days. Conjugated linolenic acid, an omega-5 fatty acid, has significant antioxidant and anti-inflammatory properties, and has been shown to stimulate keratinocyte proliferation and epidermal regeneration. By modulating the early inflammatory milieu and directly affecting skin structure and function, conjugated linolenic acid might therefore shorten downtime following fractionated ablative laser resurfacing of the face...
October 2017: Journal of Clinical and Aesthetic Dermatology
https://www.readbyqxmd.com/read/29340854/therapeutic-efficacy-and-safety-of-a-1927-nm-fractionated-thulium-laser-on-pattern-hair-loss-an-evaluator-blinded-split-scalp-study
#8
Sung Bin Cho, Boncheol Leo Goo, Zhenlong Zheng, Kwang Ho Yoo, Jin-Soo Kang, Heesu Kim
Laser- or light-assisted therapies have been used to improve the perifollicular environment by upregulating the expression of growth factors and signaling molecules for hair restoration. The aim of our study was to preclinically and clinically evaluate the therapeutic efficacy and safety of a 1927-nm fractionated thulium laser on pattern hair loss (PHL). An in vivo hairless mouse study and an in vivo human skin environmental scanning electron microscopy (ESEM) study were performed with different power and energy settings...
January 16, 2018: Lasers in Medical Science
https://www.readbyqxmd.com/read/29334731/on-the-validity-of-measuring-metallic-and-semiconducting-swcnt-fractions-by-quantitative-raman-spectroscopy
#9
Ying Tian, Hua Jiang, Patrik Laiho, Esko I Kauppinen
Although it is known that the Raman spectroscopic signature of single-walled carbon nanotubes (SWCNTs) is highly chirality dependent, using Raman spectroscopy as a tool for quantifying fraction of either metallic or semiconducting nanotubes in a sample has become a widely used analytical method. In this work, using the electron diffraction technique as a basis, we have examined the validity of Raman spectroscopy for quantitative evaluation of metallic fractions (M%) in single-walled carbon nanotube samples...
January 16, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29328711/measurement-of-the-frequency-of-the-2%C3%A2-3-s-2%C3%A2-3-p-transition-of-4-he
#10
X Zheng, Y R Sun, J-J Chen, W Jiang, K Pachucki, S-M Hu
The 2 ^{3}S-2 ^{3}P transition of ^{4}He was measured by comb-linked laser spectroscopy using a transverse-cooled atomic beam. The centroid frequency was determined to be 276 736 495 600.0(1.4) kHz, with a fractional uncertainty of 5.1×10^{-12}. This value is not only more accurate but also differs by as much as -49.5  kHz (20σ) from the previous result given by [Cancio Pastor et al., Phys. Rev. Lett. 92, 023001 (2004)PRLTAO0031-900710.1103/PhysRevLett.92.023001; Cancio Pastor et al.Phys. Rev...
December 29, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29328218/scattering-cross-sectional-modulation-in-photoacoustic-remote-sensing-microscopy
#11
Kevan Bell, Parsin Hajireza, Roger Zemp
Modeling and observations of large scattering cross-sectional modulations in absorbing optical scatterers due to a pulsed laser excitation are reported. Rapid laser-induced thermo-elastic expansion produces nontrivial perturbations to the local refractive indices. This mechanism forms the basis of a recent non-contact photoacoustic technique known as photoacoustic remote sensing microscopy. A time-evolution model is constructed and discussed, comparing it with existing planar models, time-independent models, and experiments...
January 1, 2018: Optics Letters
https://www.readbyqxmd.com/read/29327112/simultaneous-pre-concentration-and-separation-on-simple-paper-based-analytical-device-for-protein-analysis
#12
Ji-Cheng Niu, Ting Zhou, Li-Li Niu, Zhen-Sheng Xie, Fang Fang, Fu-Quan Yang, Zhi-Yong Wu
In this work, fast isoelectric focusing (IEF) was successfully implemented on an open paper fluidic channel for simultaneous concentration and separation of proteins from complex matrix. With this simple device, IEF can be finished in 10 min with a resolution of 0.03 pH units and concentration factor of 10, as estimated by color model proteins by smartphone-based colorimetric detection. Fast detection of albumin from human serum and glycated hemoglobin (HBA1c) from blood cell was demonstrated. In addition, off-line identification of the model proteins from the IEF fractions with matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS) was also shown...
January 11, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29320586/safety-and-efficacy-of-a-1550nm-1927nm-dual-wavelength-laser-for-the-treatment-of-photodamaged-skin
#13
Vic A Narurkar, Tina S Alster, Eric F Bernstein, Tina J Lin, Anya Loncaric
<p>BACKGROUND: Fractional photothermolysis (FP) is a popular treatment option for photodamaged skin and addresses shortcomings of ablative skin resurfacing and nonablative dermal remodeling. Previous studies have demonstrated that FP using the 1550nm wavelength has led to improvement of ultrastructural changes and clinical effects associated with photodamaged skin in the deeper dermal structures, while treatment with the 1927nm wavelength has shown clinical effects in the superficial dermis. Both wavelengths produce precise microscopic treatment zones (MTZs) in the skin...
January 1, 2018: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/29312568/transcriptional-response-to-hypoxic-stress-in-melanoma-and-prognostic-potential-of-gbe1-and-bnip3
#14
Stéphanie Buart, Stéphane Terry, Muhammad Z Noman, Emilie Lanoy, Céline Boutros, Paul Fogel, Philippe Dessen, Guillaume Meurice, Yann Gaston-Mathé, Philippe Vielh, Séverine Roy, Emilie Routier, Virginie Marty, Sophie Ferlicot, Luc Legrès, Morad El Bouchtaoui, Nyam Kamsu-Kom, Jane Muret, Eric Deutsch, Alexander Eggermont, Jean-Charles Soria, Caroline Robert, Salem Chouaib
Gradients of hypoxia occur in most solid tumors and cells found in hypoxic regions are associated with the most aggressive and therapy-resistant fractions of the tumor. Despite the ubiquity and importance of hypoxia responses, little is known about the variation in the global transcriptional response to hypoxia in melanoma. Using microarray technology, whole genome gene expression profiling was first performed on established melanoma cell lines. From gene set enrichment analyses, we derived a robust 35 probes signature (hypomel for HYPOxia MELanoma) associated with hypoxia-response pathways, including 26 genes up regulated, and 9 genes down regulated...
December 12, 2017: Oncotarget
https://www.readbyqxmd.com/read/29306191/investigations-on-the-micellization-of-amphiphilic-dendritic-copolymers-from-unimers-to-micelles
#15
Cuiyun Zhang, Huipeng Zhou, Yongxin Li, Yunyi Zhang, Cong Yu, Hongfei Li, Yu Chen, Ian W Hamley, Shichun Jiang
Since the micellization kinetics is influenced by polymer structure, the spherical three-dimensional topology of amphiphilic dendritic copolymers (ADPs) which hinders the phase separation during micellization is assumed to make the micellization kinetics different. In the literatures, most of the attention has been paid to the morphology transition or the morphology at equilibrium and the micellization kinetics of ADPs is rarely reported. In this study, the micellization processes of amphiphilic dendritic copolymers from unimers to the final equilibrium micelles were monitored by laser light scattering...
December 27, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29304516/ablative-fractional-co2-laser-for-facial-atrophic-acne-scars
#16
Yaqin Xu, Yunhua Deng
Ablative fractional carbon dioxide laser resurfacing is a well-established treatment for acne scars. However, there are limited consensus and guidelines regarding the procedure, such as its treatment plan, efficacy, and safety. In this study, we performed a systematic review to assess the efficacy and safety of the fractional carbon dioxide laser treatment procedure, and to provide evidence-based recommendations concerning its practical use on atrophic acne scars. A comprehensive search was performed in, EMBASE, Ovid, Web of Science, and Cochrane databases, using the keywords "scar(s)," "acne vulgaris," "carbon dioxide," and "fraction* laser(s)" for the period from January 1987 to December 2016...
January 5, 2018: Facial Plastic Surgery: FPS
https://www.readbyqxmd.com/read/29304001/microstructure-and-sliding-wear-behaviour-of-in-situ-tic-reinforced-composite-surface-layers-fabricated-on-ductile-cast-iron-by-laser-alloying
#17
Damian Janicki
TiC-reinforced composite surface layers (TRLs) on a ductile cast iron EN-GJS-700-2 grade (DCI) substrate were synthesized using a diode laser surface alloying with a direct injection of titanium powder into the molten pool. The experimental results were compared with thermodynamic calculations. The TRLs having a uniform distribution of the TiC particles and their fraction up to 15.4 vol % were achieved. With increasing titanium concentration in the molten pool, fractions of TiC and retained austenite increase and the shape of TiC particles changes from cubic to dendritic form...
January 5, 2018: Materials
https://www.readbyqxmd.com/read/29297727/fluorescence-of-radiation-induced-tissue-damage
#18
Irina Raznitsyna, Polina Kulikova, Dmitry Rogatkin, Dmitry Kulikov, Oleg Bychenkov, Yuliya Chursinova, Maksim Bobrov, Alexey Glazkov
PURPOSE: The aim of this study was evaluating changes in the photosensitizer fluorescence in vivo in the radiation-induced damage area in comparison of intact areas with a simultaneous assessment of changes both in blood parameters and in histological data. METHODS AND MATERIALS: The study was conducted in white outbred SHK mice (n = 21). Their right hindlimbs were irradiated with a dose of 25 Gy after the intraperitoneal injections of photosensitizer "Photosens"...
January 3, 2018: International Journal of Radiation Biology
https://www.readbyqxmd.com/read/29296499/momentum-transfer-monte-carlo-for-the-simulation-of-laser-speckle-imaging-and-its-application-in-the-skin
#19
Caitlin Regan, Carole Hayakawa, Bernard Choi
Due to its simplicity and low cost, laser speckle imaging (LSI) has achieved widespread use in biomedical applications. However, interpretation of the blood-flow maps remains ambiguous, as LSI enables only limited visualization of vasculature below scattering layers such as the epidermis and skull. Here, we describe a computational model that enables flexible in-silico study of the impact of these factors on LSI measurements. The model uses Monte Carlo methods to simulate light and momentum transport in a heterogeneous tissue geometry...
December 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/29289316/resolution-improvement-of-3d-stereo-lithography-through-the-direct-laser-trajectory-programming-application-to-microfluidic-deterministic-lateral-displacement-device
#20
Petra Juskova, Alexis Ollitrault, Marco Serra, Jean-Louis Viovy, Laurent Malaquin
The vast majority of current microfluidic devices are produced using soft lithography, a technique with strong limitations regarding the fabrication of three-dimensional architectures. Additive manufacturing holds great promises to overcome these limitations, but conventional machines still lack the resolution required by most microfluidic applications. 3D printing machines based on two-photon lasers, in contrast, have the needed resolution but are too limited in speed and size of the global device. Here we demonstrate how the resolution of conventional stereolithographic machines can be improved by a direct programming of the laser path and can contribute to bridge the gap between the two above technologies, allowing the direct printing of features between 10 and 100 μm, corresponding to a large fraction of microfluidic applications...
February 13, 2018: Analytica Chimica Acta
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