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https://www.readbyqxmd.com/read/28422180/patterning-graphene-film-by-magnetic-assisted-uv-ozonation
#1
Yixuan Wu, Haihua Tao, Shubin Su, Huan Yue, Hao Li, Ziyu Zhang, Zhenhua Ni, Xianfeng Chen
Developing an alternative method for fabricating microscale graphene patterns that overcomes the obstacles of organic contamination, linewidth resolution, and substrate damaging is paramount for applications in optoelectronics. Here we propose to pattern chemical vapor deposition grown graphene film through a stencil mask by magnetic-assisted ultraviolet (UV) ozonation under irradiation of a xenon excimer lamp. In this process, the paramagnetic oxygen molecules and photochemically generated oxygen radicals are magnetized and attracted in an inhomogenous external magnetic field...
April 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28406626/excimer-monomer-photoluminescence-mechanochromism-and-vapochromism-of-pentiptycene-containing-cyclometalated-platinum-ii-complexes
#2
Che-Jen Lin, Yi-Hung Liu, Shie-Ming Peng, Teruo Shinmyozu, Jye-Shane Yang
The ability of the bulky H-shaped pentiptycene scaffold in promoting the mechanochromic and vapochromic luminescence properties for organometallic materials has been demonstrated with the N^C^N cyclometalated platinum(II) complexes [X-NCNPtY], where X = Br or Pa, the substituent on the terdentate dipyridylbenzene N^C^N ligand, and Y = Cl or Pa, the ancillary ligand, in which Pa = pentiptycene acetylene. Intermolecular interactions between the planar NCNPt cores are described by π-π and d-π interactions with negligible Pt(II)···Pt(II) bonding, corresponding to ligand-centered excimer rather than metal-metal-to-ligand charge-transfer emission, for these platinum(II) complexes in aggregates and in the solid state...
April 13, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28396803/corneal-clarity-and-visual-outcomes-after-small-incision-lenticule-extraction-and-comparison-to-femtosecond-laser-assisted-in-situ-keratomileusis
#3
Apostolos Lazaridis, Konstantinos Droutsas, Walter Sekundo, Michael Petrak, Stephan Schulze
Purpose. To evaluate corneal clarity and visual outcomes after small-incision lenticule extraction (SMILE) and compare them to femtosecond laser-assisted in situ keratomileusis (FS-LASIK). Materials and Methods. Fifty-eight myopic eyes of 33 patients who underwent SMILE were compared to 58 eyes of 33 patients treated with FS-LASIK. All procedures were performed using VisuMax® femtosecond laser and MEL 80® excimer laser (Carl Zeiss Meditec AG, Germany). Pentacam™ (Oculus, Germany) was used for pre- and 3-month postoperative corneal densitometry (CD) analysis...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28388072/tuning-the-excimer-emission-of-amphiphilic-platinum-ii-complexes-mediated-by-phospholipid-vesicles
#4
Marsel Z Shafikov, Alfiya F Suleymanova, Dmitry N Kozhevnikov, Burkhard König
Two new amphiphilic platinum(II) complexes, [Pt(2-(4-fluorophenyl)-5-(4-dodecyloxyphenyl)pyridine) (acac)] (Pt-1) and [Pt(2-(4-dodecyloxyphenyl)-5-(thien-2-yl)-c-cyclopentenepyridine) (acac)] (Pt-2), where acac is acetylacetonate, were synthesized and characterized. Apart from conventional phosphorescence of single molecules (ME-monomer emission), complexes Pt-1 and Pt-2 also exhibit excimer emission (EE) when embedded into phospholipid vesicles, that is assigned to emissive Pt-Pt excimers. The EE intensity in vesicular media appeared to depend on the viscosity of the vesicles and the concentration of the embedded complex...
April 7, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28387767/femtosecond-laser-assisted-in-situ-keratomileusis-for-the-correction-of-residual-ametropia-after-deep-anterior-lamellar-keratoplasty-a-pilot-investigation
#5
A Balestrazzi, A Balestrazzi, F Menicacci, G Cartocci, F Menicacci, P Michieletto, E Balestrazzi
PurposeTo evaluate the refractive and visual results of one-stage laser-assisted in situ keratomileusis with femtosecond laser (Femto-LASIK) for the correction of residual ametropia after deep anterior lamellar keratoplasty (DALK).MethodsThis retrospective study included 13 eyes of 12 patients, who underwent corneal Femto-LASIK to correct refractive errors after DALK. IntraLase FS150 was used to create a lamellar flap and excimer laser ablation for refractive correction was performed using the Star S4 IR Excimer Laser in eight cases and the Technolas 217z Excimer Laser in Tissue Saving mode in five cases...
April 7, 2017: Eye
https://www.readbyqxmd.com/read/28386707/laser-recanalization-of-a-chronically-occluded-transjugular-intrahepatic-portosystemic-shunt-tips
#6
Alaa Mahmoud, David M Tabriz, Beau B Toskich
Transjugular intrahepatic portosystemic shunt (TIPS) dysfunction is conventionally managed with balloon angioplasty, stent extension, and sharp recanalization when necessary. We describe percutaneous transjugular recanalization and neointimal excision of a chronically occluded 17-year-old TIPS using excimer laser after conventional techniques were unsuccessful. Patient clinical improvement and shunt patency were documented three weeks post-intervention.
April 6, 2017: Cardiovascular and Interventional Radiology
https://www.readbyqxmd.com/read/28385020/ground-state-vs-excited-state-interchromophoric-interaction-topology-dependent-excimer-contribution-in-mof-photophysics
#7
Pravas Deria, Jierui Yu, Tanner Smith, Rajesh Prabhu Balaraman
Metal-organic frameworks (MOFs) define emerging materials with unique optoelectronic properties that stem from the highly organized chromophoric linkers within their frameworks. The extent of ground- and excited-state interchromophoric interaction among the π-conjugated macrocyclic linkers was studied within three tetraphenyl-pyrene (1,3,6,8-tetrakis(p-benzoicacid)pyrene; H₄TBAPy) -based MOFs: ROD-7 (In₂(OH)₂TBAPy; frz), NU-901 (scu), and NU-1000 (csq) via steady-state and time-resolved spectroscopic techniques...
April 7, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28384723/optimum-laser-beam-characteristics-for-achieving-smoother-ablations-in-laser-vision-correction
#8
Shwetabh Verma, Juergen Hesser, Samuel Arba-Mosquera
Purpose: Controversial opinions exist regarding optimum laser beam characteristics for achieving smoother ablations in laser-based vision correction. The purpose of the study was to outline a rigorous simulation model for simulating shot-by-shot ablation process. The impact of laser beam characteristics like super Gaussian order, truncation radius, spot geometry, spot overlap, and lattice geometry were tested on ablation smoothness. Methods: Given the super Gaussian order, the theoretical beam profile was determined following Lambert-Beer model...
April 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28375972/striae-distensae-preventative-and-therapeutic-modalities-to-improve-aesthetic-appearance
#9
Nicholas A Ross, Derek Ho, Juliya Fisher, Andrew Mamalis, Edward Heilman, Nazanin Saedi, Jared Jagdeo
BACKGROUND: Striae distensae (SD) are aesthetically troublesome to patients and therapeutically challenging. OBJECTIVE: Herein, the authors comprehensively review the literature pertaining to the history, pathogenesis, clinical presentation, clinical rating scales, and laboratory, imaging, and histologic features of SD. METHODS AND MATERIALS: A review of PubMed, MEDLINE, Scopus, Embase, and Google scholar was conducted, including literature published from 1773 to August 6, 2016...
April 3, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/28366365/intraocular-lens-power-calculations-in-eyes-with-previous-hyperopic-laser-in-situ-keratomileusis-or-photorefractive-keratectomy
#10
Eric B Hamill, Li Wang, Hayley K Chopra, Warren Hill, Douglas D Koch
PURPOSE: To evaluate the accuracy of 7 intraocular lens (IOL) calculation formulas in patients with previous hyperopic laser in situ keratomileusis (LASIK) or excimer laser photorefractive keratectomy (PRK). DESIGN: Retrospective case series. SETTING: Cullen Eye Institute, Baylor College of Medicine, Houston, Texas, and private practice, Mesa, Arizona, USA. METHODS: The 7 formulas evaluated were the adjusted Atlas 0-3, Masket, Modified Masket, Haigis-L, Shammas-PL, Barrett True-K, and Barrett True-K No-History...
February 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28366363/comparison-of-clinical-outcomes-between-wavefront-optimized-versus-corneal-wavefront-guided-transepithelial-photorefractive-keratectomy-for-myopic-astigmatism
#11
Ikhyun Jun, David Sung Yong Kang, Jerry Tan, Jin Young Choi, Woon Heo, Joo Young Kim, Min Goo Lee, Eung Kweon Kim, Kyoung Yul Seo, Tae-Im Kim
PURPOSE: To evaluate and compare the clinical outcomes, including visual acuity, refractive errors, and aberrations, between aberration-free transepithelial photorefractive keratectomy (PRK) and corneal wavefront-guided transepithelial PRK in eyes with myopic astigmatism. SETTING: Yonsei University College of Medicine and Eyereum Eye Clinic, Seoul, South Korea. DESIGN: Retrospective comparative case series. METHODS: Patients with myopic astigmatism were treated with aberration-free transepithelial PRK or corneal wavefront-guided transepithelial PRK using a 1050 Hz high-repetition excimer laser...
February 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28359626/effects-of-femtosecond-and-excimer-lasers-on-implanted-kamra-corneal-inlay-in-animal-models
#12
F K Sammouh, T A Baban, W N Dandan, E L Warrak
PURPOSE: To evaluate the effect of femtosecond laser and excimer laser on an intracorneal inlay (KAMRA(®)) implanted in animal models. METHODS: Femtosecond laser was used to create corneal intrastromal pockets at 250μm depth in five porcine eyes. Four intact KAMRA inlays, examined by slit-lamp biomicroscopy and light microscopy, were implanted in the pocket of four eyes. A standard LASIK flap was created above each implanted inlay in the four eyes using a femtosecond laser with flap thicknesses of 150μm, 130μm, 110μm and 90μm...
March 27, 2017: Journal Français D'ophtalmologie
https://www.readbyqxmd.com/read/28358506/disaggregation-is-a-mechanism-for-emission-turn-on-of-ortho-aminomethylphenylboronic-acid-based-saccharide-sensors
#13
Brette M Chapin, Pedro Metola, Sai Lakshmana Vankayala, H Lee Woodcock, Tiddo J Mooibroek, Vincent M Lynch, Joseph D Larkin, Eric V Anslyn
ortho-Aminomethylphenylboronic acid-based receptors with appended fluorophores are commonly used as molecular sensors for saccharides in aqueous media. The mechanism for fluorescence modulation in these sensors has been attributed to some form of photoinduced electron transfer (PET) quenching, which is diminished in the presence of saccharides. Using a well-known boronic acid-based saccharide sensor (3), this work reveals a new mechanism for fluorescence turn-on in these types of sensors. Compound 3 exhibits an excimer, and the associated ground-state aggregation is responsible for fluorescence modulation under certain conditions...
April 11, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28341348/the-impact-of-oral-polypodium-leucotomos-extract-on-ultraviolet-b-response-a-human-clinical-study
#14
Indermeet Kohli, Rubina Shafi, Prescilia Isedeh, James L Griffith, Mohammed S Al-Jamal, Narumol Silpa-Archa, Bradford Jackson, Mohammed Athar, Nikiforos Kollias, Craig A Elmets, Henry W Lim, Iltefat H Hamzavi
BACKGROUND: There is a rationale for adding systemic photoprotective agents to the current photoprotection regimen. OBJECTIVE: This study was designed to objectively evaluate the molecular and photobiologic effects of oral administration of Polypodium leucotomos extract (PLE). METHODS: In all, 22 subjects with Fitzpatrick skin phototype I to III were enrolled. On day 1, subjects were irradiated with visible light, ultraviolet (UV) A1, and UVB (using 308-nm excimer laser)...
March 21, 2017: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/28323482/constraints-on-the-early-terrestrial-surface-uv-environment-relevant-to-prebiotic-chemistry
#15
Sukrit Ranjan, Dimitar D Sasselov
The UV environment is a key boundary condition to abiogenesis. However, considerable uncertainty exists as to planetary conditions and hence surface UV at abiogenesis. Here, we present two-stream multilayer clear-sky calculations of the UV surface radiance on Earth at 3.9 Ga to constrain the UV surface fluence as a function of albedo, solar zenith angle (SZA), and atmospheric composition. Variation in albedo and latitude (through SZA) can affect maximum photoreaction rates by a factor of >10.4; for the same atmosphere, photoreactions can proceed an order of magnitude faster at the equator of a snowball Earth than at the poles of a warmer world...
March 2017: Astrobiology
https://www.readbyqxmd.com/read/28323297/excimers-from-stable-and-persistent-supramolecular-radical-pairs-in-red-nir-emitting-organic-nanoparticles-and-polymeric-films
#16
Davide Blasi, Domna M Nikolaidou, Francesca Terenziani, Imma Ratera, Jaume Veciana
In this work, the luminescence properties of new materials based on open-shell molecular systems are studied. In particular, we prepared polymeric films and organic nanoparticles (ONPs) doped with triphenylmethyl radical molecules. ONPs exhibit a uniform size distribution, spherical morphology and high colloidal stability. The emission spectrum of low-doped ONP suspensions and low-doped films is very similar to the emission spectrum of TTM in solution, while the luminescence lifetime and the luminescence quantum yield (LQY) are highly increased...
March 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28320220/a-combination-of-yiqiqubai-granule-and-308-nm-excimer-laser-in-treatment-of-segmental-vitiligo-a-prospective-study-of-233-patients
#17
Chengzhong Zhang, Le Zhou, Jie Huang, Weimin Shi
OBJECTIVE: To study the effect of Yiqiqubai granule combined with 308-nm excimer laser treatment for segmental vitiligo (SV). METHODS: A prospective research was performed in 233 patients with SV treated in Shanghai General Hospital from 11 February 2015 to 25 August 2016, they were divided into group A (n = 75), group B (n = 78) and group C (n = 80) according to the random number table. Group A was treated with Yiqiqubai granule, group B treated with 308-nm excimer laser and group C treated with combined treatments...
March 21, 2017: Journal of Dermatological Treatment
https://www.readbyqxmd.com/read/28317527/phototherapy-and-combination-therapies-for-vitiligo
#18
REVIEW
Samia Esmat, Rehab A Hegazy, Suzan Shalaby, Stephen Chu-Sung Hu, Cheng-Che E Lan
Vitiligo is a disease characterized by disappearance of melanocytes from the skin. It can negatively influence the physical appearance of affected individuals, and may profoundly affect a person's psychosocial function and quality of life. Therefore, vitiligo should not be considered as merely a condition that affects a patient's appearance, but needs to be actively treated in patients who seek medical help. Phototherapy has been used as the main treatment modality for patients with vitiligo. Different forms of phototherapy for vitiligo include broadband UVB, narrowband UVB, excimer light and excimer laser, and psoralen plus UVA...
April 2017: Dermatologic Clinics
https://www.readbyqxmd.com/read/28316041/the-structure-of-cu-ii-and-hg-ii-complexes-of-bispyrenyl-azine-revisited
#19
Arturo Espinosa Ferao, Rafaela García
Azine ligands show preference for the antiperiplanar conformation, but their 2:2 ligand-metal complexes can exhibit a central N4M2 core in the most stable chair arrangement, as in the case of the model lithium complex, with the ligand displaying a synclinal conformation that is not stable in the free ligand. According to DFT calculations, complexation of Cu(2+) with bis(1-pyrenyl)azine (1) affords a C2-symmetric [1·Cu(2+)]2 species with a planar central N4Cu2 core exhibiting a weak cuprophilic interaction...
April 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28300320/improvement-in-moderate-to-severe-vitiligo-using-a-novel-combination-of-308%C3%A2-nm-excimer-laser-and-a-surgical-needling-technique
#20
S BinSheikhan, M Al Abadie
No abstract text is available yet for this article.
April 2017: Clinical and Experimental Dermatology
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