keyword
MENU ▼
Read by QxMD icon Read
search

Lasers

keyword
https://www.readbyqxmd.com/read/28231638/comparison-of-the-shock-absorption-capacities-of-different-mouthguards
#1
Melina Simonetta Bochnig, Min-Jung Oh, Theresa Nagel, Fred Ziegler, Paul-Georg Jost-Brinkmann
BACKGROUND/AIMS: In this in vitro study the protective qualities of different mouthguard types were examined during small hard object collisions. The aim was to investigate inconclusive aspects of hard inserts, nylon nets and air spaces as reinforcements in the anterior region and the protection qualities of ethylene vinyl acetate (EVA). MATERIALS AND METHODS: Five different mouthguards with a labial thickness between 2 mm and 11 mm made of materials of varying stiffness were investigated...
February 23, 2017: Dental Traumatology: Official Publication of International Association for Dental Traumatology
https://www.readbyqxmd.com/read/28231605/endonasal-versus-external-dacryocystorhinostomy-for-nasolacrimal-duct-obstruction
#2
REVIEW
Lona Jawaheer, Caroline J MacEwen, Deepa Anijeet
BACKGROUND: A dacryocystorhinostomy (DCR) procedure aims to restore drainage of tears by bypassing a blockage in the nasolacrimal duct, through the creation of a bony ostium that allows communication between the lacrimal sac and the nasal cavity. It can be performed using endonasal or external approaches. The comparative success rates of these two approaches have not yet been established and this review aims to evaluate the relevant up-to-date research. OBJECTIVES: The primary aim of this review is to compare the success rates of endonasal DCR with that of external DCR...
February 24, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28231517/measurements-of-x-ray-doses-and-spectra-produced-by-picosecond-laser-irradiated-solid-targets
#3
Bo Yang, Rui Qiu, Minghai Yu, Jinlong Jiao, Wei Lu, Yonghong Yan, Bo Zhang, Zhimeng Zhang, Weimin Zhou, Junli Li, Hui Zhang
Experiments have shown that high-intensity laser interaction with a solid target can generate significant X-ray doses. This study was conducted to determine the X-ray doses and spectra produced for picosecond laser-irradiated solid targets. The photon doses and X-ray spectra in the laser forward and side directions were measured using an XG III ps 300 TW laser system. For laser intensities of 7×10(18)-4×10(19)W/cm(2), the maximum photon dose was 16.8 mSv at 50cm with a laser energy of ~153J on a 1-mm Ta target...
February 9, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28231402/ex-vivo-visualization-of-human-ciliated-epithelium-and-quantitative-analysis-of-induced-flow-dynamics-by-using-optical-coherence-tomography
#4
Yuye Ling, Xinwen Yao, Ute A Gamm, Emilio Arteaga-Solis, Charles W Emala, Michael A Choma, Christine P Hendon
BACKGROUND AND OBJECTIVE: Cilia-driven mucociliary clearance is an important self-defense mechanism of great clinical importance in pulmonary research. Conventional light microscopy possesses the capability to visualize individual cilia and its beating pattern but lacks the throughput to assess the global ciliary activities and flow dynamics. Optical coherence tomography (OCT), which provides depth-resolved cross-sectional images, was recently introduced to this area. MATERIALS AND METHODS: Fourteen de-identified human tracheobronchial tissues are directly imaged by two OCT systems: one system centered at 1,300 nm with 6...
February 23, 2017: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/28231400/evaluation-of-the-combined-use-of-narrow-band-imaging-and-high-speed-imaging-to-discriminate-laryngeal-lesions
#5
Veronika Volgger, Axelle Felicio, Jörg Lohscheller, Anna S Englhard, Hanan Al-Muzaini, Christian S Betz, Maria E Schuster
BACKGROUND AND OBJECTIVE: Laryngeal lesions are usually investigated by microlaryngoscopy, biopsy, and histopathology. This study aimed to evaluate the combined use of Narrow Band Imaging (NBI) and High-Speed Imaging (HSI) in the differentiation of glottic lesions in awake patients. STUDY DESIGN: Prospective diagnostic study. MATERIALS AND METHODS: Thirty-six awake patients with 41 glottic lesions were investigated with both NBI and HSI, and the suspected diagnoses were compared to the histopathological results of tissue biopsies taken during subsequent microlaryngoscopies...
February 23, 2017: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/28231390/intraoperative-assessment-of-laryngeal-pathologies-with-optical-coherence-tomography-integrated-into-a-surgical-microscope
#6
Anna S Englhard, Tom Betz, Veronika Volgger, Eva Lankenau, Georg J Ledderose, Herbert Stepp, Christian Homann, Christian S Betz
OBJECTIVE: Endoscopic examination followed by tissue biopsy is the gold standard in the evaluation of lesions of the upper aerodigestive tract. However, it can be difficult to distinguish between healthy mucosa, dysplasia, and invasive carcinoma. Optical coherence tomography (OCT) is a non-invasive technique which acquires high-resolution, cross-sectional images of tissue in vivo. Integrated into a surgical microscope, it allows the intraoperative evaluation of lesions simultaneously with microscopic visualization...
February 23, 2017: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/28231380/perioperative-medications-for-preventing-temporarily-increased-intraocular-pressure-after-laser-trabeculoplasty
#7
REVIEW
Linda Zhang, Jennifer S Weizer, David C Musch
BACKGROUND: Glaucoma is the international leading cause of irreversible blindness. Intraocular pressure (IOP) is the only currently known modifiable risk factor; it can be reduced by medications, incisional surgery, or laser trabeculoplasty (LTP). LTP reduces IOP by 25% to 30% from baseline, but early acute IOP elevation after LTP is a common adverse effect. Most of these IOP elevations are transient, but temporarily elevated IOP may cause further optic nerve damage, worsening of glaucoma requiring additional therapy, and permanent vision loss...
February 23, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28231079/vaginal-erbium-laser-as-second-generation-thermotherapy-for-the-genitourinary-syndrome-of-menopause-a-pilot-study-in-breast-cancer-survivors
#8
Marco Gambacciani, Marco Levancini
OBJECTIVE: The aim of this study was to evaluate the efficacy and acceptability of a second generation of vaginal laser treatment, the vaginal erbium laser, as a nonablative photothermal therapy for the management of genitourinary syndrome of menopause in postmenopausal breast cancer survivors. METHODS: The study was performed using an erbium laser crystal yttrium-aluminum-garnet (XS Fotona Smooth, Fotona, Ljubljana, Slovenia) with a wavelength of 2,940 nm. Forty-three postmenopausal breast cancer survivors were treated with three laser applications every 30 days...
March 2017: Menopause: the Journal of the North American Menopause Society
https://www.readbyqxmd.com/read/28231069/the-potential-of-transcranial-photobiomodulation-therapy-for-treatment-of-major-depressive-disorder
#9
Farzad Salehpour, Seyed Hossein Rasta
Major depressive disorder is a common debilitating mood disorder that affects quality of life. Prefrontal cortex abnormalities, an imbalance in neurotransmitters, neuroinflammation, and mitochondrial dysfunction are the major factors in the etiology of major depressive disorder. Despite the efficacy of pharmacotherapy in the treatment of major depressive disorder, 30%-40% of patients do not respond to antidepressants. Given this, exploring the alternative therapies for treatment or prevention of major depressive disorder has aroused interest among scientists...
February 23, 2017: Reviews in the Neurosciences
https://www.readbyqxmd.com/read/28230998/influence-of-the-anomeric-conformation-in-the-intermolecular-interactions-of-glucose
#10
Imanol Usabiaga, Jorge González, Iker León, Pedro Felipe Arnaiz, Emilio J Cocinero, Jose A Fernandez
Carbohydrates are together with amino acids, DNA bases and lipids the building blocks of living beings. They play a central role in basic functions as immunity and signaling, which are governed by non-covalent interactions between sugar units and/or with other biomolecules. To get insights on such interactions between monosaccharide units, we used a combination of mass-resolved laser spectroscopy in supersonic expansions and molecular structure calculations. The results obtained clearly demonstrate that the small stability difference between the α/β anomers of glucopyranose derivatives is reversed and amplified during molecular aggregation, making the complexes of the β-anomers significantly more stable...
February 23, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28230895/sex-assessment-from-the-volume-of-the-first-metatarsal-bone-a-comparison-of-linear-and-volume-measurements
#11
Daniele Gibelli, Pasquale Poppa, Marco Cummaudo, Mirko Mattia, Annalisa Cappella, Debora Mazzarelli, Matteo Zago, Chiarella Sforza, Cristina Cattaneo
Sexual dimorphism is a crucial characteristic of skeleton. In the last years, volumetric and surface 3D acquisition systems have enabled anthropologists to assess surfaces and volumes, whose potential still needs to be verified. This article aimed at assessing volume and linear parameters of the first metatarsal bone through 3D acquisition by laser scanning. Sixty-eight skeletons underwent 3D scan through laser scanner: Seven linear measurements and volume from each bone were assessed. A cutoff value of 13,370 mm(3) was found, with an accuracy of 80...
February 23, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28230869/a-combined-high-temperature-experimental-and-theoretical-kinetic-study-of-the-reaction-of-dimethyl-carbonate-with-oh-radicals
#12
Fethi Khaled, Binod Raj Giri, Milán Szőri, Tam V-T Mai, Lam K Huynh, Aamir Farooq
The reaction kinetics of dimethyl carbonate (DMC) and OH radicals were investigated behind reflected shock waves over the temperature range of 872-1295 K and at pressures near 1.5 atm. Reaction progress was monitored by detecting OH radicals at 306.69 nm using a UV laser absorption technique. The rate coefficients for the reaction of DMC with OH radicals were extracted using a detailed kinetic model developed by Glaude et al. (Proc. Combust. Inst. 2005, 30(1), 1111-1118). The experimental rate coefficients can be expressed in Arrhenius form as: kexpt'l = 5...
February 23, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28230743/quasi-static-calibration-method-of-a-high-g-accelerometer
#13
Yan Wang, Jinbiao Fan, Jing Zu, Peng Xu
To solve the problem of resonance during quasi-static calibration of high-g accelerometers, we deduce the relationship between the minimum excitation pulse width and the resonant frequency of the calibrated accelerometer according to the second-order mathematical model of the accelerometer, and improve the quasi-static calibration theory. We establish a quasi-static calibration testing system, which uses a gas gun to generate high-g acceleration signals, and apply a laser interferometer to reproduce the impact acceleration...
February 20, 2017: Sensors
https://www.readbyqxmd.com/read/28230594/alveolar-molding-effect-in-infants-with-unilateral-cleft-lip-and-palate-comparison-of-two-and-three-dimensional-measurements
#14
Won Hee Lim, Eun Woo Park, Hwa Sung Chae, Soon Man Kwon, Hoi-In Jung, Seung-Hak Baek
The purpose of this study was to compare the results of two- (2D) and three-dimensional (3D) measurements for the alveolar molding effect in patients with unilateral cleft lip and palate. The sample consisted of 23 unilateral cleft lip and palate infants treated with nasoalveolar molding (NAM) appliance. Dental models were fabricated at initial visit (T0; mean age, 23.5 days after birth) and after alveolar molding therapy (T1; mean duration, 83 days). For 3D measurement, virtual models were constructed using a laser scanner and 3D software...
February 22, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28230319/depletion-of-abundant-human-serum-proteins-by-per-se-imprinted-cryogels-based-on-sample-heterogeneity
#15
Chun Yang, Ya-Ru Liu, Yan Zhang, Jian Wang, Li-Li Tian, Ya-Nan Yan, Wei-Qin Cao, Yu-Yang Wang
Macroporous cryogels were prepared and used to deplete abundant proteins. It was accomplished based on the sample heterogeneity rather than any exogenous assistance. Human serum was added in monomer solutions to synthesize molecularly imprinted polymers (MIPs); therein some abundant proteins were imprinted in the polyacrylamide cryogels. Meanwhile the rare components remained aqueous. Chromatography and electrophoresis showed that albumin, serotransferrin and most globulins were depleted by columns packed with the MIPs...
February 23, 2017: Proteomics
https://www.readbyqxmd.com/read/28230203/water-insoluble-photosensitizer-nanocolloids-stabilized-by-supramolecular-interfacial-assembly-towards-photodynamic-therapy
#16
Yamei Liu, Kai Ma, Tifeng Jiao, Ruirui Xing, Guizhi Shen, Xuehai Yan
Nanoengineering of hydrophobic photosensitizers (PSs) is a promising approach for improved tumor delivery and enhanced photodynamic therapy (PDT) efficiency. A variety of delivery carriers have been developed for tumor delivery of PSs through the enhanced permeation and retention (EPR) effect. However, a high-performance PS delivery system with minimum use of carrier materials with excellent biocompatibility is highly appreciated. In this work, we utilized the spatiotemporal interfacial adhesion and assembly of supramolecular coordination to achieve the nanoengineering of water-insoluble photosensitizer Chlorin e6 (Ce6)...
February 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28230153/unconventional-high-performance-laser-protection-system-based-on-dichroic-dye-doped-cholesteric-liquid-crystals
#17
Wanshu Zhang, Lanying Zhang, Xiao Liang, Le Zhou, Jiumei Xiao, Li Yu, Fasheng Li, Hui Cao, Kexuan Li, Zhou Yang, Huai Yang
High-performance and cost-effective laser protection system is of crucial importance for the rapid advance of lasers in military and civilian fields leading to severe damages of human eyes and sensitive optical devices. However, it is crucially hindered by the angle-dependent protective effect and the complex preparation process. Here we demonstrate that angle-independence, good processibility, wavelength tunability, high optical density and good visibility can be effectuated simultaneously, by embedding dichroic anthraquinone dyes in a cholesteric liquid crystal matrix...
February 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28229593/development-of-laser-structured-liquid-infused-titanium-with-strong-biofilm-repellent-properties
#18
Katharina Doll, Elena Fadeeva, Joern Schaeske, Tobias Ehmke, Andreas Winkel, Alexander Heisterkamp, Boris N Chichkov, Meike Stiesch, Nico S Stumpp
Medical implants are commonly used in modern medicine but still harbor the risk of microbial infections caused by bacterial biofilms. As their retrospective treatment is difficult, there is a need for biomedical materials, which inhibit bacterial colonization from the start without using antibacterial agents, as these can promote resistance development. The promising concept of slippery liquid-infused porous surfaces (SLIPS) possesses enormous potential for this purpose. In the present study, this principle was applied to titanium, a common material in implantology, and its biofilm-repellent properties were demonstrated...
February 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28229292/laser-eustachian-tuboplasty-for-eustachian-tube-dysfunction-a-case-series-review
#19
REVIEW
Benjamin John Miller, Mustafa Jaafar, Hassan A Elhassan
The authors reviewed the literature regarding the safety and efficacy of Laser Eustachian Tuboplasty (LETP) in the treatment of Eustachian tube dysfunction (ETD). Medline via Pubmed, OvidSP and Science Direct were consulted, with a supplementary manual review of citations. English language case series constituted a baseline for inclusion. Primary outcome measures were pre- and post-operative tympanometry, otoscopy findings, subjective symptoms and pure tone audiometry, and findings were stratified into short term (≤6 months) and long term (>6 months-5 years)...
February 22, 2017: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/28229211/multicenter-international-experience-of-532%C3%A2-nm-laser-photo-vaporization-with-greenlight-xps-in-men-with-large-prostates-prostate-volume%C3%A2-%C3%A2-100%C3%A2-cc
#20
Malek Meskawi, Pierre-Alain Hueber, Roger Valdivieso, Franck Bruyere, Vincent Misrai, Georges Fournier, Ravi Munver, Ganesh Sivarajan, Matthew Rutman, Alexis E Te, Bilal Chughtai, Dean Elterman, Tristan Martel, Mounsif Azizi, Pierre I Karakiewicz, Kevin C Zorn
PURPOSE: To evaluate the outcomes and durability of photoselective vaporization of the prostate (PVP) using the XPS-180 system in patients with a large prostate volume (PV) > 100 cc at 4 years of follow-up in a large, multicenter experience. METHODS: 438 men with pre-operative transrectal ultrasound (TRUS) PV > 100 cc were treated in eight experienced centers in Canada, USA, and in France with the Greenlight XPS laser using PVP for the treatment of symptomatic BPH...
February 22, 2017: World Journal of Urology
keyword
keyword
37392
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"