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https://www.readbyqxmd.com/read/29652404/terahertz-emission-from-metal-nanoparticle-array
#1
Daniil A Fadeev, Ivan V Oladyshkin, Vyacheslav A Mironov
We demonstrate theoretically that ultrafast heating of metal nanoparticles by the laser pulse should lead to the generation of coherent terahertz (THz) radiation during the heat redistribution process. It is shown that after the femtosecond laser pulse action, the time-dependent gradient of the electronic temperature induces low-frequency particle polarization with the characteristic timescale of about fractions of a picosecond. In the case of the directed metallic pattern, the THz pulse waveform can be controlled by changing the geometry of the particle...
April 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29652355/tunable-dispersion-compensation-of-quantum-cascade-laser-frequency-combs
#2
Johannes Hillbrand, Pierre Jouy, Mattias Beck, Jérôme Faist
Compensating for group velocity dispersion is an important challenge to achieve stable midinfrared quantum cascade laser (QCL) frequency combs with large spectral coverage. We present a tunable dispersion compensation scheme consisting of a planar mirror placed behind the back facet of the QCL. Dispersion can be either enhanced or decreased depending on the position of the mirror. We demonstrate that the fraction of the comb regime in the dynamic range of the laser increases considerably when the dispersion induced by the Gires-Tournois interferometer compensates the intrinsic dispersion of the laser...
April 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29652341/thermal-noise-limited-higher-order-mode-locking-of-a-reference-cavity
#3
X Y Zeng, Y X Ye, X H Shi, Z Y Wang, K Deng, J Zhang, Z H Lu
Higher-order mode locking has been proposed to reduce the thermal noise limit of reference cavities. By locking a laser to the HG02 mode of a 10-cm long all ultra-low expansion (ULE) cavity and measuring its performance with the three-cornered-hat method among three independently stabilized lasers, we demonstrate a thermal-noise-limited performance of a fractional frequency instability of 4.9×10-16 . The results match the theoretical models with higher-order optical modes. The achieved laser instability improves the all ULE short cavity results to a new low level...
April 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29643518/-application-of-anoptomagnetic-probe-gd-do3a-ea-fitc-in-imaging-and-analyzing-the-brain-interstitial-space
#4
Y Q Li, Y Sheng, L Liang, Y Zhao, H Y Li, N Bai, T Wang, L Yuan, H B Han
OBJECTIVE: To investigate the application of the optical magnetic bimodal molecular probe Gd-DO3A-ethylthiouret-fluorescein isothiocyanate (Gd -DO3A-EA-FITC) in brain tissue imaging and brain interstitial space (ISS). METHODS: In the study, 24 male SD rats were randomly divided into 3 groups, including magnetic probe group (n=6), optical probe group (n=6) and optical magnetic bimodal probe group (n=12), then the optical magnetic bimodal probe group was divided equally into magnetic probe subgroup (n=6) and optical probe subgroup (n=6)...
April 18, 2018: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/29627130/patient-satisfaction-after-fractional-ablation-of-burn-scar-with-2940nm-wavelength-erbium-yag-laser
#5
Tarik D Madni, Paul A Nakonezny, Jonathan B Imran, Audra T Clark, Holly B Cunningham, John E Hoopman, Brett D Arnoldo, Steven E Wolf, Jeffrey M Kenkel, Herb A Phelan
OBJECTIVE: Fractional laser therapy is a new treatment with potential benefit in the treatment of burn scars. We sought to determine patient satisfaction after burn scar treatment with the Erbium-Yag laser. METHODS: We performed a telephone survey of all patients who underwent fractional resurfacing of burn scars with the Erbium-Yag 2940 wavelength laser at Parkland Hospital from 01/01/2016 to 05/01/2017. Subjects were asked to rate their satisfaction with their scars' after treatment characteristics on a scale from 1 (completely unsatisfied) to 10 (completely satisfied)...
April 4, 2018: Burns: Journal of the International Society for Burn Injuries
https://www.readbyqxmd.com/read/29620562/treatment-of-sclerodermoid-graft-versus-host-disease-with-the-fractionated-nonablative-1-927-nm-thulium-fiber-laser
#6
Kristopher Peters, Isabela T Jones, Mitchel P Goldman
No abstract text is available yet for this article.
April 3, 2018: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/29616293/physicochemical-study-of-natural-fractionated-biocolloid-by-asymmetric-flow-field-flow-fractionation-in-tandem-with-various-complementary-techniques-using-biologically-synthesized-silver-nanocomposites
#7
Viorica Railean-Plugaru, Pawel Pomastowski, Tomasz Kowalkowski, Myroslav Sprynskyy, Boguslaw Buszewski
Asymmetric flow field-flow fractionation coupled with use of ultraviolet-visible, multiangle light scattering (MALLS), and dynamic light scattering (DLS) detectors was used for separation and characterization of biologically synthesized silver composites in two liquid compositions. Moreover, to supplement the DLS/MALLS information, various complementary techniques such as transmission electron spectroscopy, Fourier transform infrared spectroscopy, and matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) were used...
April 3, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29608613/proteomic-fingerprinting-in-hiv-hcv-co-infection-reveals-serum-biomarkers-for-the-diagnosis-of-fibrosis-staging
#8
Makan Golizeh, Carlos E Melendez-Pena, Brian J Ward, Sahar Saeed, Cynthia Santamaria, Brian Conway, Curtis Cooper, Marina B Klein, Momar Ndao
BACKGROUND: Hepatic complications of hepatitis C virus (HCV), including fibrosis and cirrhosis are accelerated in human immunodeficiency virus (HIV)-infected individuals. Although, liver biopsy remains the gold standard for staging HCV-associated liver disease, this test can result in serious complications and is subject to sampling errors. These challenges have prompted a search for non-invasive methods for liver fibrosis staging. To this end, we compared serum proteome profiles at different stages of fibrosis in HIV/HCV co- and HCV mono-infected patients using surface-enhanced laser desorption ionization time-of-flight mass spectrometry (SELDI-TOF MS)...
2018: PloS One
https://www.readbyqxmd.com/read/29604786/note-making-tens-of-centimeter-long-uniform-microfluidic-channels-using-commercial-glass-pipette
#9
Neil Ou, Huang-Ming Lee, Jong-Ching Wu
Producing microchannels with diameters between 10 and 20 μm and with lengths in the tens of centimeters is reported. The method can be modified to obtain diameters as narrow as 350 nm. Length-to-diameter aspect ratios that surpass 104 can be produced for a fraction of current production costs. The controllable channel is produced by applying a flame to the narrow end of a commercial pipette that is made from a soda-lime silicate. In combination with a pulling mechanism, applying heat to the composite material lengthens the pipette in a highly uniform way...
March 2018: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29603458/automated-calibration-of-laser-spectrometer-measurements-of-%C3%AE-18-o-and-%C3%AE-2-h-values-in-water-vapour-using-a-dew-point-generator
#10
Niels C Munksgaard, Alexander W Cheesman, Andrew Gray-Spence, Lucas A Cernusak, Michael I Bird
RATIONALE: Continuous measurement of stable O and H isotope compositions in water vapour requires automated calibration for remote field deployments. We developed a new low-cost device for calibration of both water vapour mole fraction and isotope composition. METHODS: We coupled a commercially available dew point generator (DPG) to a laser spectrometer and developed hardware for water and air handling along with software for automated operation and data processing...
March 30, 2018: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/29602057/structure-and-chemistry-of-interfaces-between-ceria-and-yttria-stabilized-zirconia-studied-by-analytical-stem
#11
H Schmid, E Gilardi, G Gregori, P Longo, J Maier, P A van Aken
Epitaxial undoped and Gd2 O3 -doped ceria films were grown by pulsed laser deposition on (1 1 1) faced Y2 O3 -stabilized zirconia (YSZ). Highly localized cerium reduction at the film-substrate interfaces is revealed by atomically resolved valence EELS mapping using Cs aberration-corrected scanning transmission electron microscopy. The chemical profiles reveal interdiffusion of Ce, (Gd), Y, Zr, forming an intermixing zone at the interface 7-9 (1 1 1) lattice planes wide. In its vicinity, the fraction of Ce3+ raises gradually over 6-8 lattice planes from zero in the bulk ceria to ≈100% in one single plane at the interface...
January 31, 2018: Ultramicroscopy
https://www.readbyqxmd.com/read/29600700/separation-of-branched-poly-bisphenol-a-carbonate-structures-by-solvent-gradient-at-near-critical-conditions-and-two-dimensional-liquid-chromatography
#12
Nico Apel, Elena Uliyanchenko, Stephan Moyses, Stijn Rommens, Christian Wold, Tibor Macko, Robert Brüll
Branching is a molecular metric that strongly influences the application properties of polymers. Consequently, detailed information on the microstructure is required to gain a deeper understanding of structure-property relationships. In the present case, we employ high-performance liquid chromatography to characterize the branching in a poly(bisphenol A carbonate) (PC). To this end, a method was developed based on a mobile phase gradient in a very narrow range (±1.4 vol%) around the point of adsorption (98...
March 30, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29600378/proteomic-protocol-in-esophageal-adenocarcinoma
#13
Peter Kelly
The technique of surface-enhanced laser desorption/ionization time-of-flight SELDI-TOF mass spectrometry could be used to establish serum or plasma proteomic profiles in esophageal adenocarcinoma. The protein profiles in patients may be used to predict survival and monitor response to chemotherapy in patients with esophageal adenocarcinoma. Here, a protocol for sample preparation from esophageal adenocarcinoma, analysis of proteomic profiles, and collection of protein fractions for identification of significant peaks is presented...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29590712/analysis-of-airborne-dust-as-a-result-of-plaster-cast-sawing
#14
Anko Antabak, Damir Halužan, Abdulah Chouehne, Marko Mance, Nino Fuchs, Ivica Prlić, Ivan Bešlić, Zvjezdana Bencetić Klaić
Plaster splints are used daily in surgical and orthopedic fields in order to immobilize injured children and adults. The aim of this study was to measure the aerodynamic diameter and concentration of dust particles in the air caused by sawing plaster splints (calcium sulfate dehy-drate). We performed fractional measurements of airborne dust particles. The measured particles, which can potentially be inhaled, may have a specific negative effect on human health. Measurements were conducted in laboratory research facilities that simulated hospital conditions within a casting room and the associated waiting room...
December 2017: Acta Clinica Croatica
https://www.readbyqxmd.com/read/29574997/fractional-ablative-carbon-dioxide-laser-followed-by-topical-sodium-stibogluconate-application-a-treatment-option-for-pediatric-cutaneous-leishmaniasis
#15
Yuval Hilerowicz, Amir Koren, Jacob Mashiah, Oren Katz, Eli Sprecher, Ofir Artzi
BACKGROUND: Leishmaniasis is a protozoan zoonotic parasitic infection with cutaneous, mucocutaneous, and visceral manifestations. Israel is endemic for cutaneous leishmaniasis, which is a self-limited disease but is associated with scarring, which is often a source of psychological and social burden for patients. Scars can be especially devastating for children and teenagers. A wide range of physical and medical approaches is used to treat cutaneous leishmaniasis, among which intralesional injections of sodium stibogluconate rank among the most frequently used...
March 25, 2018: Pediatric Dermatology
https://www.readbyqxmd.com/read/29574803/preventive-effect-of-polynucleotide-on-post-thyroidectomy-scars-a-randomized-double-blinded-controlled-trial
#16
Ji Hee Kim, Jong Ju Jeong, Young In Lee, Won Jai Lee, Chorok Lee, Woong Youn Chung, Kee-Hyun Nam, Ju Hee Lee
BACKGROUND AND OBJECTIVE: Polynucleotide (PN) provides a structural scaffold to induce anti-inflammatory and enhanced wound healing properties, and this study aimed to assess the efficacy of PN administration in the prevention of post-operative scars after conventional open total thyroidectomy. STUDY DESIGN MATERIALS AND METHODS: Forty-two patients with thyroid carcinoma who underwent total thyroidectomy were randomly assigned to the study (PN administration) or control (normal saline) group...
March 25, 2018: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/29566498/dense-colloidal-mixtures-in-an-external-sinusoidal-potential
#17
R F Capellmann, A Khisameeva, F Platten, S U Egelhaaf
Concentrated binary colloidal mixtures containing particles with a size ratio 1:2.4 were exposed to a periodic potential that was realized using a light field, namely, two crossed laser beams creating a fringe pattern. The arrangement of the particles was recorded using optical microscopy and characterized in terms of the pair distribution function along the minima, the occupation probability perpendicular to the minima, the angular bond distribution, and the average potential energy per particle. The particle arrangement was investigated in dependence of the importance of particle-potential and particle-particle interactions by changing the potential amplitude and particle concentration, respectively...
March 21, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29566134/purification-of-lectin-and-kunitz-trypsin-inhibitor-from-soya-seeds
#18
Uttam K Roy, Nathalie Lavignac, Azizur M Rahman, Birthe V Nielsen
The search for potent and selective therapeutic agents is progressing by the study of natural compounds in plants. Plant-derived macromolecules are considered emerging therapeutic agents and an alternative to synthetic and small molecule drugs. Where it has long been known that plants possess medicinal properties, the compounds responsible for their action are in many cases still unknown: often only whole crude plant extracts or fractionated extracts are tested for the ability to inhibit common pathogens. Here, we present a fast protein liquid chromatography method for the separation of crude plant proteins...
March 16, 2018: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/29556818/the-effect-of-3-wt-cu-addition-on-the-microstructure-tribological-property-and-corrosion-resistance-of-cocrw-alloys-fabricated-by-selective-laser-melting
#19
Jiasi Luo, Songquan Wu, Yanjin Lu, Sai Guo, Yang Yang, Chaoqian Zhao, Junjie Lin, Tingting Huang, Jinxin Lin
Microstructure, tribological property and corrosion resistance of orthopedic implant materials CoCrW-3 wt.% Cu fabricated by selective laser melting (SLM) process were systematically investigated with CoCrW as control. Equaxied γ-phase together with the inside {111} < 112 > type twin and platelet ε-phase was found in both the Cu-bearing and Cu-free alloys. Compared to the Cu-free alloy, the introduction of 3 wt.% Cu significantly increased the volume fraction of the ε-phase. In both alloys, the hardness of ε-phase zone was rather higher (~4 times) than that of γ-phase zone...
March 19, 2018: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29553543/regenerative-therapy-by-suprachoroidal-cell-autograft-in-dry-age-related-macular-degeneration-preliminary-in-vivo-report
#20
Paolo Giuseppe Limoli, Enzo Maria Vingolo, Celeste Limoli, Sergio Zaccaria Scalinci, Marcella Nebbioso
This study is aimed at examining whether a suprachoroidal graft of autologous cells can improve best corrected visual acuity (BCVA) and responses to microperimetry (MY) in eyes affected by dry Age-related Macular Degeneration (AMD) over time through the production and secretion of growth factors (GFs) on surrounding tissue. Patients were randomly assigned to each study group. All patients were diagnosed with dry AMD and with BCVA equal to or greater than 1 logarithm of the minimum angle of resolution (logMAR)...
February 12, 2018: Journal of Visualized Experiments: JoVE
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