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https://www.readbyqxmd.com/read/28434428/local-response-of-sialoliths-to-lithotripsy-cues-on-fragmentation-outcome
#1
Pedro Nolasco, Ana J Dos Anjos, José Dias, Paulo V Coelho, Carla Coelho, Manuel Evaristo, Albano Cavaleiro, António Maurício, Manuel F C Pereira, Virgínia Infante, António P Alves de Matos, Raúl C Martins, Patricia A Carvalho
Lithotripsy methods show relatively low efficiency in the fragmentation of sialoliths compared with the success rates achieved in the destruction of renal calculi. However, the information available on the mechanical behavior of sialoliths is limited and their apparently tougher response is not fully understood. This work evaluates the hardness and Young's modulus of sialoliths at different scales and analyzes specific damage patterns induced in these calcified structures by ultrasonic vibrations, pneumoballistic impacts, shock waves, and laser ablation...
April 24, 2017: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/28432654/laser-desorption-ionization-mass-spectrometric-imaging-of-endogenous-lipids-from-rat-brain-tissue-implanted-with-silver-nanoparticles
#2
Ludovic Muller, Kathrine Baldwin, Damon C Barbacci, Shelley N Jackson, Aurélie Roux, Carey D Balaban, Bruce E Brinson, Michael I McCully, Ernest K Lewis, J Albert Schultz, Amina S Woods
Mass spectrometry imaging (MSI) of tissue implanted with silver nanoparticulate (AgNP) matrix generates reproducible imaging of lipids in rodent models of disease and injury. Gas-phase production and acceleration of size-selected 8 nm AgNP is followed by controlled ion beam rastering and soft landing implantation of 500 eV AgNP into tissue. Focused 337 nm laser desorption produces high quality images for most lipid classes in rat brain tissue (in positive mode: galactoceramides, diacylglycerols, ceramides, phosphatidylcholines, cholesteryl ester, and cholesterol, and in negative ion mode: phosphatidylethanolamides, sulfatides, phosphatidylinositol, and sphingomyelins)...
April 21, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28430138/nanomaterials-as-assisted-matrix-of-laser-desorption-ionization-time-of-flight-mass-spectrometry-for-the-analysis-of-small-molecules
#3
REVIEW
Minghua Lu, Xueqing Yang, Yixin Yang, Peige Qin, Xiuru Wu, Zongwei Cai
Matrix-assisted laser desorption/ionization (MALDI), a soft ionization method, coupling with time-of-flight mass spectrometry (TOF MS) has become an indispensible tool for analyzing macromolecules, such as peptides, proteins, nucleic acids and polymers. However, the application of MALDI for the analysis of small molecules (<700 Da) has become the great challenge because of the interference from the conventional matrix in low mass region. To overcome this drawback, more attention has been paid to explore interference-free methods in the past decade...
April 21, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28429082/the-effect-of-a-combined-thoracic-and-soft-tissue-trauma-on-blood-flow-and-tissue-formation-in-fracture-healing-in-rats
#4
Lutz Claes, Florian Gebhard, Anita Ignatius, Raimund Lechner, Stefan Baumgärtel, Michael Kraus, Gert D Krischak
INTRODUCTION: Previously, it was found that fracture healing is impaired by blunt chest trauma and an additional soft-tissue trauma. The mechanisms leading to this disturbance are largely unknown. Here, we investigated the effect of thoracic and soft-tissue trauma on blood flow of the injured lower leg and on tissue differentiation and callus formation during fracture healing. MATERIALS AND METHODS: Male Wistar rats received either a mid-shaft fracture of the tibia alone (group A), an additional chest trauma (group B), or additional chest and soft-tissue traumas (group C)...
April 20, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28412265/one-stage-supramaximal-full-thickness-wedge-resection-of-vascular-lip-anomalies
#5
Dawn K De Castro, Zhi Yang Ng, Paul W Holzer, Milton Waner, Curtis L Cetrulo, Aaron Fay
PURPOSE: Vascular lip anomalies include infantile hemangiomas, venous malformations, and arteriovenous malformations. Surgical management can be complicated by alterations in horizontal length, vertical height, and lip thickness from the underlying pathology. Additional reconstructive challenges include preservation of oral continence, vermillion definition, and the sublabial sulcus. This report describes a technique of supramaximal single-stage full-thickness wedge resection of these lesions...
March 22, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28411414/laser-interstitial-thermotherapy-litt-in-epilepsy-surgery
#6
REVIEW
Christian Hoppe, Juri-Alexander Witt, Christoph Helmstaedter, Thomas Gasser, Hartmut Vatter, Christian E Elger
Besides other innovative stereotactic procedures (radiofrequency thermocoagulation, focused ultrasound, gamma knife) laser interstitial thermotherapy (LiTT) provides minimally invasive destruction of pathological soft tissues which could be especially relevant for epilepsy surgeries involving adult and pediatric patients. Unlike standard resections, no craniotomy is required; just a tiny borehole trepanation is sufficient. Damage to cortical areas when accessing deep lesions can be minimized or completely avoided, and treating epileptogenic foci near eloquent or even vital brain areas becomes possible...
April 6, 2017: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/28395127/site-specific-gene-expression-analysis-of-implant-near-cells-in-a-soft-tissue-infection-model-application-of-laser-microdissection-to-study-biomaterial-associated-infection
#7
Sara Svensson, Margarita Trobos, Omar Omar, Peter Thomsen
Analysis of the implant-tissue interface is important for an understanding of the cellular response to biomaterials with different surface characteristics. However, inaccessibility to the site has restricted the detailed evaluation of the tissue surrounding the implant. Laser microdissection enables the isolation of specific cells and tissues for subsequent DNA, RNA or protein analysis. The present experimental study employed laser microdissection to analyse tissue-specific differences in gene expression in cells around infected or control titanium implants 72 hours after subcutaneous implantation in a rat model...
April 10, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28393759/laser-technique-for-the-fabrication-of-blood-vessels-like-models-for-preclinical-studies-of-pathologies-under-flow-conditions
#8
María Aymerich, Ezequiel Álvarez, Carmen Bao, Isabel Moscoso, José Ramón González-Juanatey, Maria Flores Arias
In this work a method for fabricating functionalized preclinical devices is presented. The manufacturing process combines a laser indirect writing technique to fabricate a soda-lime glass master and soft-lithography methods to obtain the final structure in polydimethylsiloxane (PDMS). The roughness of the device is modified in a controlled manner by applying a post-thermal treatment to the master and devices with different roughness values are created. The PDMS devices are fully covered with human umbilical vein cells (HUVEC) in a two-step process...
April 10, 2017: Biofabrication
https://www.readbyqxmd.com/read/28391087/effects-of-two-wattages-of-low-level-laser-therapy-on-orthodontic-tooth-movement
#9
M Milligan, Y Arudchelvan, S-G Gong
INTRODUCTION: Mixed outcomes have been found in animal and clinical studies with regard to the use of low-level laser therapy (LLLT) as a modality to accelerate orthodontic tooth movement (OTM). One major reason for the variable findings is the different methodologies and protocols for laser therapy use. OBJECTIVE: The aim of this study was to determine whether orthodontically moved molars exposed to two different wattages at the same energy density of LLLT exhibited differences in the amount of tooth movement and molecular and histological changes in the adjacent periodontal areas...
March 24, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28385435/effect-of-repeated-ceramic-firings-on-the-marginal-and-internal-adaptation-of-metal-ceramic-restorations-fabricated-with-different-cad-cam-technologies
#10
Hasan Kocaağaoğlu, Haydar Albayrak, Halil Ibrahim Kilinc, Hasan Önder Gümüs
STATEMENT OF PROBLEM: The use of computer-aided design and computer-aided manufacturing (CAD-CAM) for metal ceramic restorations has increased with advances in the technology. However, little is known about the marginal and internal adaptation of restorations fabricated using laser sintering (LS) and soft milling (SM). Moreover, the effects of repeated ceramic firings on the marginal and internal adaptation of metal ceramic restorations fabricated with LS and SM is also unknown. PURPOSE: The purpose of this in vitro study was to investigate the effects of repeated ceramic firings on the marginal and internal adaptation of metal ceramic copings fabricated using the lost wax (LW), LS, and SM techniques...
April 3, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28383186/fabrication-of-micropatterned-self-oscillating-polymer-brush-for-direction-control-of-chemical-waves
#11
Kenta Homma, Tsukuru Masuda, Aya Mizutani Akimoto, Kenichi Nagase, Kazuyoshi Itoga, Teruo Okano, Ryo Yoshida
The propagation control of chemical waves via a pentagonal patterned structure in a self-oscillating polymer brush composed of N-isopropylacrylamide and a metal catalyst for the Belousov-Zhabotinsky (BZ) reaction is reported. The patterned self-oscillating polymer brush is prepared by combining surface-initiated atom transfer radical polymerization and maskless photolithography. Surface modification is confirmed by X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, 3D measuring laser microscopy, and fluorescence microscopy...
April 6, 2017: Small
https://www.readbyqxmd.com/read/28374604/soft-independent-modeling-of-class-analogy-simca-modeling-of-laser-induced-plasma-emission-spectra-of-edible-salts-for-accurate-classification
#12
Yonghoon Lee, Song-Hee Han, Sang-Ho Nam
We report soft independent modeling of class analogy (SIMCA) analysis of laser-induced plasma emission spectra of edible salts from 12 different geographical origins for their classification model. The spectra were recorded by using a simple laser-induced breakdown spectroscopy (LIBS) device. Each class was modeled by principal component analysis (PCA) of the LIBS spectra. For the classification of a separate test data set, the SIMCA model showed 97% accuracy in classification. An additional insight could be obtained by comparing the SIMCA classification result with that of partial least squares discriminant analysis (PLS-DA)...
January 1, 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28374523/ultrafast-independent-n-h-and-n-c-bond-deformation-investigated-with-resonant-inelastic-x-ray-scattering
#13
Sebastian Eckert, Jesper Norell, Piter S Miedema, Martin Beye, Mattis Fondell, Wilson Quevedo, Brian Kennedy, Markus Hantschmann, Annette Pietzsch, Benjamin E Van Kuiken, Matthew Ross, Michael P Minitti, Stefan P Moeller, William F Schlotter, Munira Khalil, Michael Odelius, Alexander Föhlisch
The femtosecond excited-state dynamics following resonant photoexcitation enable the selective deformation of N-H and N-C chemical bonds in 2-thiopyridone in aqueous solution with optical or X-ray pulses. In combination with multiconfigurational quantum-chemical calculations, the orbital-specific electronic structure and its ultrafast dynamics accessed with resonant inelastic X-ray scattering at the N 1s level using synchrotron radiation and the soft X-ray free-electron laser LCLS provide direct evidence for this controlled photoinduced molecular deformation and its ultrashort timescale...
April 4, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28368427/photo-induced-structural-modification-of-silk-gels-containing-azobenzene-side-groups
#14
Michael J Landry, Matthew B Applegate, Oleksandr S Bushuyev, Fiorenzo G Omenetto, David L Kaplan, Mark Cronin-Golomb, Christopher J Barrett
Azobenzene modification of Bombyx mori silkworm silk creates a photo-responsive 'azosilk' biomaterial, allowing for 3D laser patterning. Written regions fluoresce, and become fluid-filled raised 'micro-blisters' with a 10-fold photo-softening effect of the modulus. Patterning is facile and versatile, with potential applications as soft tunable materials for dynamic cell guidance and microfluidics.
April 19, 2017: Soft Matter
https://www.readbyqxmd.com/read/28363660/expanding-role-of-percutaneous-ablative-and-consolidative-treatments-for-musculoskeletal-tumours
#15
REVIEW
A N Kurup, M R Callstrom
Interventional approaches to musculoskeletal tumours have significantly changed over the last several years, and new treatments continue to be developed. All ablative modalities are currently applied to the treatment of bone tumours, including radiofrequency, cryo-, microwave, and laser ablation devices. Indications for ablation of bone and soft-tissue tumours have expanded beyond palliation of painful bone metastases and eradication of osteoid osteomas to the local control of oligometastatic disease from a number of primary tumours and ablation of desmoid tumours...
March 28, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28358719/properties-of-quasiperiodic-functions
#16
Johannes Roth
Today, quasiperiodic tilings are well known and have been studied in great detail since they are very useful to describe the properties of metallic and soft matter quasicrystals. A closely related topic are quasiperiodic functions which have also gained large interest recently. Different types of such functions and there interrelation will be presented here. The main topic will be quasiperiodic potentials generated by laser beams and their variability. The distribution of extremal points and local isomorphisms of quasiperiodic functions will also be addressed...
March 30, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28358663/a-retrospective-evaluation-of-partial-glossectomy-for-early-tongue-cancer-using-a-carbon-dioxide-laser
#17
Akira Kimoto, Hiroaki Suzuki, Junya Yamashita, Junichiro Takeuchi, Kousuke Matsumoto, Yui Enomoto, Takahide Komori
OBJECTIVE: The purpose of this study was to retrospectively evaluate the postoperative results of partial glossectomy for early tongue cancer using a carbon dioxide laser (CO2 laser). BACKGROUND DATA: CO2 lasers are frequently used for the excision or treatment of soft tissue in a range of diseases, including oral cancer, leukoplakia, mucocele, anomalies of the labial and lingual frenum, and peri-implantitis. MATERIALS AND METHODS: We retrospectively reviewed 31 primary cases of early superficial tongue cancer that were treated using CO2 lasers...
March 30, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28355177/optically-excited-structural-transition-in-atomic-wires-on-surfaces-at-the-quantum-limit
#18
T Frigge, B Hafke, T Witte, B Krenzer, C Streubühr, A Samad Syed, V Mikšić Trontl, I Avigo, P Zhou, M Ligges, D von der Linde, U Bovensiepen, M Horn-von Hoegen, S Wippermann, A Lücke, S Sanna, U Gerstmann, W G Schmidt
Transient control over the atomic potential-energy landscapes of solids could lead to new states of matter and to quantum control of nuclear motion on the timescale of lattice vibrations. Recently developed ultrafast time-resolved diffraction techniques combine ultrafast temporal manipulation with atomic-scale spatial resolution and femtosecond temporal resolution. These advances have enabled investigations of photo-induced structural changes in bulk solids that often occur on timescales as short as a few hundred femtoseconds...
April 13, 2017: Nature
https://www.readbyqxmd.com/read/28345009/optically-induced-lattice-deformations-electronic-structure-changes-and-enhanced-superconductivity-in-yba2cu3o6-48
#19
R Mankowsky, M Fechner, M Först, A von Hoegen, J Porras, T Loew, G L Dakovski, M Seaberg, S Möller, G Coslovich, B Keimer, S S Dhesi, A Cavalleri
Resonant optical excitation of apical oxygen vibrational modes in the normal state of underdoped YBa2Cu3O6+x induces a transient state with optical properties similar to those of the equilibrium superconducting state. Amongst these, a divergent imaginary conductivity and a plasma edge are transiently observed in the photo-stimulated state. Femtosecond hard x-ray diffraction experiments have been used in the past to identify the transient crystal structure in this non-equilibrium state. Here, we start from these crystallographic features and theoretically predict the corresponding electronic rearrangements that accompany these structural deformations...
July 2017: Structural Dynamics (Melville, N.Y.)
https://www.readbyqxmd.com/read/28337885/role-of-diode-lasers-in-oro-facial-pain-management
#20
F Javed, S V Kellesarian, G E Romanos
With the increasing use of low level laser therapy (LLLT) in clinical dentistry, the aim of the present study was to assess the effectiveness of diode lasers in the management of orofacial pain. Indexed databases were searched without language and time restrictions up to and including July 2016 using different combinations of the following key words: oral, low level laser therapy, dental, pain, diode lasers, discomfort and analgesia. From the literature reviewed it is evident that LLLT is effective compared to traditional procedures in the management of oro-facial pain associated to soft tissue and hard tissue conditions such as premalignant lesions, gingival conditions and dental extractions...
January 2017: Journal of Biological Regulators and Homeostatic Agents
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