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https://www.readbyqxmd.com/read/29345378/self-calibrating-mechanochromic-fluorescent-polymers-based-on-encapsulated-excimer-forming-dyes
#1
Céline Calvino, Anirvan Guha, Christoph Weder, Stephen Schrettl
While mechanochemical transduction principles are omnipresent in nature, mimicking these in artificial materials is challenging. The ability to reliably detect the exposure of man-made objects to mechanical forces is, however, of great interest for many applications, including structural health monitoring and tamper-proof packaging. A useful concept to achieve mechanochromic responses in polymers is the integration of microcapsules, which rupture upon deformation and release a payload causing a visually detectable response...
January 18, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29339692/transvenous-extraction-of-a-26-year-old-accufix-atrial-lead-using-tightrail-rotating-dilator-sheath
#2
Anar Mammadli, Veysel Kutay Vurgun, Onur Yıldırım, Ali Timuçin Altın, Başar Candemir, Ömer Akyürek
With the increasing number of implanted pacemakers and implantable cardioverter defibrillators, removal is required more frequently. Presently described is the transvenous extraction of a 26-year-old Accufix atrial lead using a mechanical dilator sheath. A 50-year-old male patient was admitted to the clinic with a pacemaker pocket infection. The atrial lead was an Accufix Bipolar J-Atrial active fixation lead, a model that was recalled in 1994, after reports of 2 deaths and 2 nonfatal injuries related to protrusion of the J retention wire...
January 2018: Türk Kardiyoloji Derneği Arşivi: Türk Kardiyoloji Derneğinin Yayın Organıdır
https://www.readbyqxmd.com/read/29335096/clinically-significant-laser-in%C3%A2-situ-keratomileusis-flap-striae
#3
Avi Wallerstein, Mathieu Gauvin, Eser Adiguzel, Harmanjit Singh, Vasudha Gupta, Mona Harissi-Dagher, Mark Cohen
PURPOSE: To describe the incidence, risk factors, and outcomes before and after irrigation of clinically significant laser in situ keratomileusis (LASIK) flap striae. SETTING: Multisurgeon multicenter standardized protocol practice. DESIGN: Retrospective case-control series. METHODS: Eyes with striae necessitating flap relift and irrigation were identified. Preoperative, intraoperative, and postoperative variables were collected...
December 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29335095/vector-analysis-of-astigmatic-changes-and-optical-quality-outcomes-after-wavefront-guided-laser-in%C3%A2-situ-keratomileusis-using-a-high-resolution-aberrometer
#4
Juan A Durán, Elisa Gutiérrez, Rebeca Atienza, David P Piñero
PURPOSE: To assess the ocular optical quality results as well as the astigmatic changes after wavefront-guided laser in situ keratomileusis (LASIK) in eyes with myopic astigmatism. SETTING: Instituto Clínico-Quirúrgico Oftalmológico, Bilbao, Vizcaya, Spain. DESIGN: Prospective case series. METHODS: Thirty-three eyes having wavefront-guided LASIK with the Star S4IR excimer laser combined with the iDesign system were enrolled in the study...
December 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29332914/long-term-clinical-outcomes-after-treatment-with-excimer-laser-coronary-atherectomy-for-in-stent-restenosis-of-drug-eluting-stent
#5
Eiji Ichimoto, Tadayuki Kadohira, Takashi Nakayama, Joseph De Gregorio
Excimer laser coronary atherectomy (ELCA) has been used for the treatment of complex percutaneous coronary intervention (PCI) such as in-stent restenosis (ISR). However, little information was provided about the clinical outcomes after treatment with ELCA for ISR of drug-eluting stents (DES). This study aimed to investigate the long-term clinical outcomes after PCI with ELCA for ISR of DES.A total of 81 consecutive patients with 87 lesions who underwent PCI for ISR of DES were included. Patients were classified into a PCI with ELCA group (23 patients with 24 lesions) and a PCI without ELCA group (58 patients with 63 lesions)...
January 15, 2018: International Heart Journal
https://www.readbyqxmd.com/read/29328325/comparing-laser-induced-plasmas-formed-in-diode-and-excimer-pumped-alkali-lasers
#6
Aram H Markosyan
Lasing on the D1 transition (62P1/2 → 62S1/2) of cesium can be reached in both diode and excimer pumped alkali lasers. The first uses D2 transition (62S1/2 → 62P3/2) for pumping, whereas the second is pumped by photoexcitation of ground state Cs-Ar collisional pairs and subsequent dissociation of diatomic, electronically-excited CsAr molecules (excimers). Despite lasing on the same D1 transition, differences in pumping schemes enables chemical pathways and characteristic timescales unique for each system...
January 8, 2018: Optics Express
https://www.readbyqxmd.com/read/29328106/polymer-thermal-optical-switch-for-a-flexible-photonic-circuit
#7
Yue Sun, Yue Cao, Qi Wang, Yunji Yi, Xiaoqiang Sun, Yuanda Wu, Fei Wang, Daming Zhang
Flexible and wearable optoelectronic devices are the new trend for an active lifestyle. These devices are polymer-based for flexibility. We demonstrated flexible polymer waveguide optical switches for a flexible photonic integrated circuit. The optical switches are composed of a single-mode inverted waveguide with dimensions of 5 μm waveguide width, 3 μm ridge height, and 3 μm slab height. A Mach-Zehnder structure was used in the device, with the Y-branch horizontal length of 0.1 cm, the distance between two heating branches of 30 μm, and the heating branch length of 1 cm...
January 1, 2018: Applied Optics
https://www.readbyqxmd.com/read/29315943/supramolecular-recognition-of-three-way-junctions-dna-by-a-cationic-calix-3-carbazole
#8
Zhaozheng Yang, Yan Chen, Gang Li, Zhangmin Tian, Liang Zhao, Xi Wu, Qi Ma, Mingzhe Liu, Peng Yang
DNA three-way junctions (TWJ-DNA) are intermediate structures in DNA replication and/or recombination. They play very important roles in biological processes, but more subtle functions are hitherto unknown due partially to the lack of a fluorescent ligand. In this study, a cationic calix[3]carbazole (2) has been synthesized and its properties of interacting with TWJ-DNA have been evaluated by UV-vis, fluorescence, circular dichroism (CD), gel electrophoresis and 1HNMR studies. The results show that 2 binds to the central hydrophobic cavity of TWJ-DNA...
January 8, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29315443/pathophysiology-of-corneal-scarring-in-persistent-epithelial-defects-after-prk-and-other-corneal-injuries
#9
Steven E Wilson, Carla S Medeiros, Marcony R Santhiago
PURPOSE: To analyze corneal persistent epithelial defects that occurred at 3 to 4 weeks after -4.50 diopter (D) photorefractive keratectomy (PRK) in rabbits and apply this pathophysiology to the treatment of persistent epithelial defects that occur after any corneal manipulations or diseases. METHODS: Two of 168 corneas that had -4.50 D PRK to study epithelial basement membrane regeneration developed spontaneous persistent epithelial defects that did not heal at 3 weeks after PRK...
January 1, 2018: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/29310219/a-single-state-fluorescent-with-bright-white-light-emission-in-the-solid-station-and-aggregation-induced-emission-enhancement-compound-for-pd0-detection
#10
Yan Zhang, Yexin Li, Xiaofeng Yang, Yiming Ding, Zongshi Zhao, Xiaolei Liu, Zhen Yang, Yu Cui
A single-state molecule compound with phenanthrene-imidazole as fluorescent core was synthesized. The compound emitted white light in solid state and exhibited aggregation induced emission enhancement (AIEE) characteristic in solution state. From photophysical properties, it was presumably that π-π stacking caused by the excimer, which generated between solid molecules, led to the emitting white light. In addition, in the solution state, with the increasing fraction of the poor solvent, the rotation of the compound molecule was inhibited, which led to the luminescence enhancement induced by aggregation...
March 1, 2018: Talanta
https://www.readbyqxmd.com/read/29310209/highly-fluorescent-sensing-of-nitroaromatic-explosives-in-aqueous-media-using-pyrene-linked-pbema-microspheres
#11
Hamza Turhan, Ece Tukenmez, Bunyamin Karagoz, Niyazi Bicak
Crosslinked 2-bromoethyl methacrylate polymer (PBEMA) was prepared in micro-spherical form (2-5µm) by precipitation polymerization methodology. The bromide substituent was substituted with an azide group, which was then coupled with 1-[(2-Propynyloxy)methyl]pyrene] via alkyne-azide click chemistry. The pyrene-linked microspheres showed an intense green-blue excimer emission with a maximum at 480nm, implying π-π stacking between the pyrene moieties on the microsphere surfaces. This fluorescence emission is extremely sensitive to the aromatic nitro compounds...
March 1, 2018: Talanta
https://www.readbyqxmd.com/read/29302786/intraoperative-changes-in-corneal-structure-during-excimer-laser-phototherapeutic-keratectomy-ptk-assessed-by-intraoperative-optical-coherence-tomography
#12
Sebastian Siebelmann, Jens Horstmann, Paula Scholz, Björn Bachmann, Mario Matthaei, Manuel Hermann, Claus Cursiefen
PURPOSE: Excimer laser phototherapeutic keratectomy (PTK) is a safe treatment for superficial corneal opacities, e.g., in corneal dystrophies or degenerations. Nevertheless, no standardized treatment protocols are available and intraoperative monitoring was not possible, so far. Here we evaluate the potential benefits of the intraoperative assessment by microscope-integrated intraoperative optical coherence tomography (MI-OCT) of corneal optical properties during PTK. METHODS: Retrospective study of eight patients (one male, seven females; age range, 43-80 years, mean = 66...
January 4, 2018: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/29299629/-the-308%C3%A2-nm-excimer-laser-for-the-treatment-of-psoriasis-and-inflammatory-skin-diseases
#13
REVIEW
K Fritz, C Salavastru
Overall, the 308 nm Excimer laser enables not only a more effective and safer UVB therapy than classical UV phototherapy, but also targeted irradiation in higher doses with a lower cumulative load, which results in faster healing of mainly circumscribed skin changes. This also applies to therapy-resistant residual lesions which, despite systemic therapy, did not diminish. Combination therapies usually improve the result and enable the dose of UVB and systemic medication to be reduced. Excimer laser therapy can be used for an increasing number of skin diseases, especially those that respond to phototherapy or photochemotherapy...
January 3, 2018: Der Hautarzt; Zeitschrift Für Dermatologie, Venerologie, und Verwandte Gebiete
https://www.readbyqxmd.com/read/29289206/pulse-stretcher-with-two-beamsplitting-elements-for-excimer-laser-pulses
#14
Qiang Wang, Yanling Han, Cunding Liu, Bincheng Li
A pulse stretcher with two beamsplitting elements and an optical ring cavity is proposed. With a two-beamsplitting-element configuration, the temporal profile of the stretched output pulse is effectively improved, and the transient peak power is significantly reduced. By optimizing the radius of curvature of the concave mirrors used in the ring cavity, the spatial profile of the stretched pulse is kept nearly unchanged. The performance of the pulse stretcher is experimentally investigated with a 193 nm excimer laser...
December 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29285963/femoropopliteal-in-stent-restenosis-gaining-ground-with-excimer-laser-and-drug-coated-balloons
#15
Nicolas W Shammas
No abstract text is available yet for this article.
December 1, 2017: Journal of Endovascular Therapy
https://www.readbyqxmd.com/read/29285589/thiophene-appended-dual-fluorescent-sensor-for-detection-of-hg2-and-cysteamine
#16
Soma Sarkar, Swapnadip Roy, R N Saha, Sujit S Panja
An efficient and highly selective pyrene-thiophene conjugate has been reported as a dual sensor for Hg2+ and cysteamine (an important drug for genetic disorder). The sensor displays a turn-on fluorescence response towards Hg2+ in a 2:1 stoichiometric ratio via excimer formation with a detection limit as low as of 30.6 nM. The excimer emission upon binding with Hg2+ has been rationalized by experimental as well as theoritical studies. Moreover, the [probe-Hg2+] adduct functions as an efficient sensor for cysteamine...
December 28, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/29282672/successful-treatment-of-refractory-vitiligo-with-a-combination-of-khellin-and-308-nm-excimer-lamp-an-open-label-1-year-prospective-study
#17
Samy Fenniche, Anissa Zaouak, Azima Ben Tanfous, Meriem Jrad, Houda Hammami
INTRODUCTION: Phototherapy is the cornerstone of treatment of vitiligo. The 308-nm excimer lamp (EL) induces T cell apoptosis and the stimulation of melanocyte proliferation. Khellin is a furanochromone with a chemical structure close to psoralens. The objective of the study was to evaluate the safety and efficacy of 1-year treatment of recalcitrant vitiligo with a combination of 308-nm EL and khellin. METHODS: Twenty patients with resistant vitiligo were included...
December 27, 2017: Dermatology and Therapy
https://www.readbyqxmd.com/read/29279546/application-of-fluoridated-hydroxyapatite-thin-film-coatings-using-krf-pulsed-laser-deposition
#18
Yoshiya Hashimoto, Mamoru Ueda, Yu Kohiga, Kazuki Imura, Shigeki Hontsu
Fluoridated hydroxyapatite (FHA) was investigated for application as an implant coating for titanium bone substitute materials in dental implants. A KrF pulsed excimer deposition technique was used for film preparation on a titanium plate. The compacts were ablated by laser irradiation at an energy density of 1 J/cm2 on an area 1×1 mm2 with the substrate at room temparature. Energydispersive spectrometric analysis of the FHA film revealed peaks of fluorine in addition to calcium and phosphorus. X-ray diffraction revealed the presence of crystalline FHA on the FHA film after a 10 h post annealing treatment at 450°C...
December 27, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/29250710/a-review-of-monochromatic-light-devices-for-the-treatment-of-alopecia-areata
#19
REVIEW
Evan Darwin, Harleen Arora, Penelope A Hirt, Tongyu Cao Wikramanayake, Joaquin J Jimenez
There are many laser technologies that are being tested that claim to support hair regrowth for patients with alopecia areata (AA). In this paper, we will determine whether the body of evidence supports the use of devices using monochromatic light sources to treat AA. Articles were gathered from PubMed, Embase, and the Cochrane database using these keywords: lasers, excimer laser, low-level laser therapy (LLLT), low-level light therapy, alopecia, alopecia areata, and hair loss with a category modifier of English...
December 17, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/29242864/three-in-one-type-fluorescent-sensor-based-on-a-pyrene-pyridoxal-cascade-for-the-selective-detection-of-zn-ii-hydrogen-phosphate-and-cysteine
#20
Yachana Upadhyay, Thangaraj Anand, Lavanya Thilak Babu, Priyankar Paira, Guido Crisponi, Ashok Kumar Sk, Rajender Kumar, Suban K Sahoo
A novel fluorescent receptor L was synthesized by Schiff base condensation of 1-pyrenemethylamine with the vitamin B6 cofactor pyridoxal. The receptor L is highly selective and sensitive towards Zn2+ ions among other tested metal ions. Upon interaction with Zn2+, the receptor L showed a distinct fluorescence enhancement at 485 nm due to the excimer formation leading to the fluorescent colour change from blue to bluish-green. Subsequently, when the in situ generated ZnL2 complex interacted with various anions and amino acids, the addition of H2PO4- and cysteine reinstated the fluorescence of the receptor L due to the demetalation of Zn2+ from the ZnL2 complex...
December 15, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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