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https://www.readbyqxmd.com/read/27905323/plasmonic-nano-protrusions-hierarchical-nanostructures-for-single-molecule-raman-spectroscopy
#1
Sagnik Basuray, Avinash Pathak, Sangho Bok, Biyan Chen, Steven C Hamm, Cherian J Mathai, Suchismita Guha, Keshab Gangopadhyay, Shubhra Gangopadhyay
Classical methods for enhancing the electromagnetic field from substrates for spectroscopic applications, such as surface-enhanced Raman spectroscopy (SERS), have involved the generation of hotspots through directed self-assembly of nanoparticles or by patterning nanoscale features using expensive nanolithography techniques. A novel large-area, cost-effective soft lithographic technique involving glancing angle deposition (GLAD) of silver on polymer gratings is reported here. This method produces hierarchical nanostructures with high enhancement factors capable of analyzing single-molecule SERS...
December 1, 2016: Nanotechnology
https://www.readbyqxmd.com/read/27888928/analytical-prediction-of-sub-surface-thermal-history-in-translucent-tissue-phantoms-during-plasmonic-photo-thermotherapy-pptt
#2
Purbarun Dhar, Anup Paul, Arunn Narasimhan, Sarit K Das
Knowledge of thermal history and/or distribution in biological tissues during laser based hyperthermia is essential to achieve necrosis of tumour/carcinoma cells. A semi-analytical model to predict sub-surface thermal distribution in translucent, soft, tissue mimics has been proposed. The model can accurately predict the spatio-temporal temperature variations along depth and the anomalous thermal behaviour in such media, viz. occurrence of sub-surface temperature peaks. Based on optical and thermal properties, the augmented temperature and shift of the peak positions in case of gold nanostructure mediated tissue phantom hyperthermia can be predicted...
December 2016: Journal of Thermal Biology
https://www.readbyqxmd.com/read/27875030/the-differentiation-of-oral-soft-and-hard-tissues-using-laser-induced-breakdown-spectroscopy-a-prospect-for-tissue-specific-laser-surgery
#3
Maximilian Rohde, Fanuel Mehari, Florian Klämpfl, Werner Adler, Friedrich-Wilhelm Neukam, Michael Schmidt, Florian Stelzle
Compared to conventional techniques, Laser surgery procedures provide a number of advantages, but may be associated with an increased risk of iatrogenic damage to important anatomical structures. The type of tissue ablated in the focus spot is unknown. Laser-Induced Breakdown-Spectroscopy (LIBS) has the potential to gain information about the type of material that is being ablated by the laser beam. This may form the basis for tissue selective laser surgery. In the present study, 7 different porcine tissues (cortical and cancellous bone, nerve, mucosa, enamel, dentine and pulp) from 6 animals were analyzed for their qualitative and semiquantitative molecular composition using LIBS...
November 22, 2016: Journal of Biophotonics
https://www.readbyqxmd.com/read/27874157/excision-of-oral-pyogenic-granuloma-in-a-diabetic-patient-with-940nm-diode-laser
#4
Maha A Al-Mohaya, Abdulaziz M Al-Malik
Pyogenic granuloma (PG) is a common, acquired, benign vascular reactive proliferation that typically develops as a small erythematous papule on the skin or oral mucosal surface. Oral PG is often caused by constant low-grade infection, minor trauma, poor oral hygiene, and due to hormonal disturbances. It shows a striking predilection for the gingiva. Lesions can be excised surgically with removal of the underlying causes. However, this modality may be associated with unnecessary complications. Recently, different laser wavelengths have been used for removal of oral PG...
December 2016: Saudi Medical Journal
https://www.readbyqxmd.com/read/27873216/prognostic-metabolite-biomarkers-for-soft-tissue-sarcomas-discovered-by-mass-spectrometry-imaging
#5
Sha Lou, Benjamin Balluff, Arjen H G Cleven, Judith V M G Bovée, Liam A McDonnell
Metabolites can be an important read-out of disease. The identification and validation of biomarkers in the cancer metabolome that can stratify high-risk patients is one of the main current research aspects. Mass spectrometry has become the technique of choice for metabolomics studies, and mass spectrometry imaging (MSI) enables their visualization in patient tissues. In this study, we used MSI to identify prognostic metabolite biomarkers in high grade sarcomas; 33 high grade sarcoma patients, comprising osteosarcoma, leiomyosarcoma, myxofibrosarcoma, and undifferentiated pleomorphic sarcoma were analyzed...
November 21, 2016: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/27867576/resection-with-preserved-histologic-morphology-of-a-rare-tumour-via-bronchoscopic-cryosurgery
#6
Jessica Han Ying Tan, Angela Maria Takano, Anne Ann Ling Hsu
Tracheobronchial leiomyoma is a rare pulmonary neoplasm accounting for <2% of benign tumours of the lower airway. Published case series reported bronchoscopic resectability with laser ablation for lesions located in the large airway. Surgery was performed for tumours with wide-based and tumours located in segmental bronchus or lung parenchyma. This is the first reported case of complete bronchoscopic cryoresection of leiomyoma arising from the subsegmental bronchi and illustrating the cryopreservation of its histologic morphology...
October 2016: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/27857279/application-of-picosecond-laser-induced-breakdown-spectroscopy-to-quantitative-analysis-of-boron-in-meatballs-and-other-biological-samples
#7
Rinda Hedwig, Kurnia Lahna, Zener Sukra Lie, Marincan Pardede, Koo Hendrik Kurniawan, May On Tjia, Kiichiro Kagawa
This report presents the results of laser-induced breakdown spectroscopy (LIBS) study on biological and food samples of high water content using a picosecond (ps) laser at low output energy of 10 mJ and low-pressure helium ambient gas at 2 kPa. Evidence of excellent emission spectra of various analyte elements with very low background is demonstrated for a variety of samples without the need of sample pretreatment. Specifically, limits of detection in the range of sub-ppm are obtained for hazardous Pb and B impurities in carrots and meatballs...
November 10, 2016: Applied Optics
https://www.readbyqxmd.com/read/27833739/surgical-non-regenerative-treatments-for-peri-implantitis-a-systematic-review
#8
REVIEW
Ausra Ramanauskaite, Povilas Daugela, Ricardo Faria de Almeida, Nikola Saulacic
OBJECTIVES: The purposes of the present study were 1) to systematically review the literature on the surgical non-regenerative treatments of peri-implantitis and 2) to determine a predictable therapeutic option for the clinical management of peri-implantitis lesions. MATERIAL AND METHODS: The study search was performed on primary database MEDLINE and EMBASE from 2005 until 2016. Sequential screenings at the title, abstract, and full-text levels were performed. Clinical human studies in the English language that had reported changes in probing depth (PD) and/or bleeding on probing (BOP) and/or radiologic marginal bone level changes after peri-implantitis surgical non-regenerative treatment at 6-month follow-up or longer were included accordingly PRISMA guidelines...
July 2016: Journal of Oral & Maxillofacial Research
https://www.readbyqxmd.com/read/27828320/x-ray-absorption-spectroscopy-using-a-self-seeded-soft-x-ray-free-electron-laser
#9
Thomas Kroll, Jan Kern, Markus Kubin, Daniel Ratner, Sheraz Gul, Franklin D Fuller, Heike Löchel, Jacek Krzywinski, Alberto Lutman, Yuantao Ding, Georgi L Dakovski, Stefan Moeller, Joshua J Turner, Roberto Alonso-Mori, Dennis L Nordlund, Jens Rehanek, Christian Weniger, Alexander Firsov, Maria Brzhezinskaya, Ruchira Chatterjee, Benedikt Lassalle-Kaiser, Raymond G Sierra, Hartawan Laksmono, Ethan Hill, Andrew Borovik, Alexei Erko, Alexander Föhlisch, Rolf Mitzner, Vittal K Yachandra, Junko Yano, Philippe Wernet, Uwe Bergmann
X-ray free electron lasers (XFELs) enable unprecedented new ways to study the electronic structure and dynamics of transition metal systems. L-edge absorption spectroscopy is a powerful technique for such studies and the feasibility of this method at XFELs for solutions and solids has been demonstrated. However, the required x-ray bandwidth is an order of magnitude narrower than that of self-amplified spontaneous emission (SASE), and additional monochromatization is needed. Here we compare L-edge x-ray absorption spectroscopy (XAS) of a prototypical transition metal system based on monochromatizing the SASE radiation of the linac coherent light source (LCLS) with a new technique based on self-seeding of LCLS...
October 3, 2016: Optics Express
https://www.readbyqxmd.com/read/27828295/relative-intersection-of-confidence-intervals-rule-for-sharper-restoration-of-soft-x-ray-images
#10
Damir Seršić, Ana Sović Kržić, Carmen S Menoni
We present a novel method for restoration of images of nanostructures obtained with a soft-ray microscope that uses a 46.9 nm soft x-ray laser microscope for illumination. To suppress the noise and to preserve the image sharpness, we develop a method based on pixel adaptive zero-order modeling of the observed object. Neighboring areas of each pixel are selected using the relative intersection of confidence intervals rule and used for restoration. Due to the non-uniform distribution of noise in the images, we use robust spatial noise modeling...
November 1, 2016: Applied Optics
https://www.readbyqxmd.com/read/27822487/measurement-of-sulfur-l2-3-and-carbon-k-edge-xanes-in-a-polythiophene-film-using-a-high-harmonic-supercontinuum
#11
A S Johnson, L Miseikis, D A Wood, D R Austin, C Brahms, S Jarosch, C S Strüber, P Ye, J P Marangos
We use a high harmonic generated supercontinuum in the soft X-ray region to measure X-ray absorption near edge structure (XANES) spectra in polythiophene (poly(3-hexylthiophene)) films at multiple absorption edges. A few-cycle carrier-envelope phase-stable laser pulse centered at 1800 nm was used to generate a stable soft X-ray supercontinuum, with amplitude gating limiting the generated pulse duration to a single optical half-cycle. We report a quantitative transmission measurement of the sulfur L2,3 edge over the range 160-200 eV and the carbon K edge from 280 to 330 eV...
November 2016: Structural Dynamics (Melville, N.Y.)
https://www.readbyqxmd.com/read/27802760/the-gempix-detector-as-new-soft-x-rays-diagnostic-tool-for-laser-produced-plasmas
#12
G Claps, D Pacella, F Murtas, K Jakubowska, G Boutoux, F Burgy, J E Ducret, D Batani
Laser produced plasmas lend to several interesting applications. The study of X-ray emission from this kind of plasmas is important not only to characterize plasmas itself but also to study the application of these particular plasmas as intense X-ray sources. In particular several emission configurations can be obtained using different kinds of targets and tuning the characteristics of the laser pulse delivered to the target. Typically, laser pulse duration ranges between a few tens of femtoseconds and tens of nanoseconds, with energies from few mJ to tens of kJ...
October 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27794148/450-nm-blue-laser-and-oral-surgery-preliminary-ex-vivo-study
#13
Carlo Fornaini, Elisabetta Merigo, Jean-Paul Rocca, Giuseppe Lagori, Hélène Raybaud, Stefano Selleri, Annamaria Cucinotta
INTRODUCTION: Dental diode lasers were started to be used at the end of the 1990s and were shown to possess several important characteristics, such as small size and low cost, as well as the advantage of optic fibers delivering system. Although only two wavelengths (810 and 980 nm) had been the most used dental diode lasers, a wavelength emitting in the blue portion of the spectrum has recently been proposed. AIM: The aim of this ex vivo study was to compare the effectiveness of five different fiber-delivered laser wavelengths (450, 532, 808, 1064, and 1340 nm) in the oral soft tissue ablation...
October 1, 2016: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/27782609/contributed-review-the-novel-gas-puff-targets-for-laser-matter-interaction-experiments
#14
Przemyslaw W Wachulak
Various types of targetry are used nowadays in laser matter interaction experiments. Such targets are characterized using different methods capable of acquiring information about the targets such as density, spatial distribution, and temporal behavior. In this mini-review paper, a particular type of target will be presented. The targets under consideration are gas puff targets of various and novel geometries. Those targets were investigated using extreme ultraviolet (EUV) and soft X-ray (SXR) imaging techniques, such as shadowgraphy, tomography, and pinhole camera imaging...
September 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27780355/the-development-of-visible-wavelength-maldi-cell-mass-spectrometry-cms-for-high-efficiency-single-cell-analysis
#15
Caiqiao Xiong, Xiaoyu Zhou, Qing He, Xi Huang, Jiyun Wang, Wen-Ping Peng, Huan-Cheng Chang, Zongxiu Nie
Mass is a fundamental physical property of individual cell, from which reveals the cell growth, cycle, and activity. Taking advantage of the cell mass spectrometry (CMS), accurate mass measurement of charged single cell has been achieved. However, with the increasing demand for high-efficiency single-cell analysis in biology, the limited throughput and inefficient cell desorption/ionization of the CMS inevitably becomes an important issue. To address the challenge, a state of the art visible-wavelength matrix assisted laser desorption/ionization (MALDI) CMS was developed...
October 26, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/27779610/factors-influencing-the-soft-tissue-changes-around-single-laser-microtextured-implants-abutments-in-the-anterior-maxilla-a-5-year-retrospective-study
#16
Renzo Guarnieri, Luca Savio, Alessandro Bermonds des Ambrois, Stefano Ippoliti, Francesco Zuffetti, Luigi Vito Stefanelli, Stefano Di Carlo, Giorgio Pompa
PURPOSE: The aim of this study was to evaluate the possible factors that influenced the periimplant soft tissue changes around single implants-abutments with laser-microtextured surface (LMS) in the esthetic zone. MATERIALS AND METHODS: Thirty-nine units, formed by implant-abutment with LMS were studied. Variables possibly associated with the periimplant soft tissue changes were obtained from clinical measurements (plaque [present/absent], periimplant biotype [thin/thick], and probing depth); intrasurgical measurements (vertical height in millimeters of the keratinized gingiva in the vestibular part of the implant site vestibular keratinized gingiva [VKG], implant vestibular crestal exposition, vestibular crestal level, and vestibular bone width); cast models (implant position [buccal/palatal], implant abutments angle); periapical radiographs (distance from the contact point to the interproximal bone crest of the adjacent tooth [CP-BC], distance from the contact point to the implant platform [CP-P], distance from the contact point to the first bone to implant contact [CP-IB]); and digital clinical photographs...
December 2016: Implant Dentistry
https://www.readbyqxmd.com/read/27768378/recombination-enhanced-surface-expansion-of-clusters-in-intense-soft-x-ray-laser-pulses
#17
Daniela Rupp, Leonie Flückiger, Marcus Adolph, Tais Gorkhover, Maria Krikunova, Jan Philippe Müller, Maria Müller, Tim Oelze, Yevheniy Ovcharenko, Benjamin Röben, Mario Sauppe, Sebastian Schorb, David Wolter, Rolf Mitzner, Michael Wöstmann, Sebastian Roling, Marion Harmand, Rolf Treusch, Mathias Arbeiter, Thomas Fennel, Christoph Bostedt, Thomas Möller
We studied the nanoplasma formation and explosion dynamics of single large xenon clusters in ultrashort, intense x-ray free-electron laser pulses via ion spectroscopy. The simultaneous measurement of single-shot diffraction images enabled a single-cluster analysis that is free from any averaging over the cluster size and laser intensity distributions. The measured charge state-resolved ion energy spectra show narrow distributions with peak positions that scale linearly with final ion charge state. These two distinct signatures are attributed to highly efficient recombination that eventually leads to the dominant formation of neutral atoms in the cluster...
October 7, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27761525/a-simple-check-valve-for-microfluidic-point-of-care-diagnostics
#18
C S Ball, R F Renzi, A Priye, R J Meagher
Check valves are often essential components in microfluidic devices, enabling automated sample processing for diagnostics at the point of care. However, there is an unmet need for a check valve design that is compatible with rigid thermoplastic devices during all stages of development-from initial prototyping with a laser cutter to final production with injection molding. Here, we present simple designs for a passive, normally closed check valve that is manufactured from commonly available materials with a CO2 laser and readily integrated into prototype and production thermoplastic devices...
November 1, 2016: Lab on a Chip
https://www.readbyqxmd.com/read/27759881/endodontic-procedures-for-retreatment-of-periapical-lesions
#19
REVIEW
Massimo Del Fabbro, Stefano Corbella, Patrick Sequeira-Byron, Igor Tsesis, Eyal Rosen, Alessandra Lolato, Silvio Taschieri
BACKGROUND: When primary root canal therapy fails, periapical lesions can be retreated with or without surgery. Root canal retreatment is a non-surgical procedure that involves removal of root canal filling materials from the tooth, followed by cleaning, shaping and obturating of the canals. Root-end resection is a surgical procedure that involves exposure of the periapical lesion through an osteotomy, surgical removal of the lesion, removal of part of the root-end tip, disinfection and, commonly, retrograde sealing or filling of the apical portion of the remaining root canal...
October 19, 2016: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/27759411/tongue-tie-assessment-clinical-aspects-and-a-new-diode-laser-technique-for-its-management
#20
R Crippa, M Paglia, F Ferrante, A Ottonello, F Angiero
: BACKGROUND Often breastfeeding problems experienced by mothers and their babies may be attributed to the abnormal attachment of the infant's tongue (ankyloglossia) and/or maxillary lip-tie. Proper breastfeeding depends upon an infant's ability to correctly latch onto its mother's breast. If born with oral soft tissue abnormalities such as tongue-tie or lip-tie, it may be almost impossible for the infant to breastfeed. During the oral evaluation of an infant presenting with breastfeeding problems, one factor that is often overlooked and undiagnosed - and thus untreated - is the attachment of the upper lip to the maxillary gingival tissue...
September 2016: European Journal of Paediatric Dentistry: Official Journal of European Academy of Paediatric Dentistry
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