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https://www.readbyqxmd.com/read/28544895/vibrational-spectroscopy-of-the-mass-selected-tetrahydrofurfuryl-alcohol-monomers-and-its-dimers-in-gas-phase-using-ir-depletion-and-vuv-single-photon-ionization
#1
Pengchao Wang, Yongjun Hu, Huaqi Zhan, Jiaxin Chen, Shan Jin, Wentao Song, Yujian Li
Tetrahydrofurfuryl alcohol (THFA, C5H10O2) is a close chemical analog of the sugar rings present in the phosphate-deoxyribose backbone structure of the nucleic acids. In present report, the infrared (IR) spectra of the size-selected THFA monomer and its dimer have been investigated in a pulsed supersonic jet using infrared-vacuum ultraviolet (VUV) ionization. Herein, the laser light at 118nm wavelength served as the source of "soft" ionization in a time-of-flight mass spectrometer. The IR features for the monomers located at 3622cm(-1) can be assigned to the intramolecular hydrogen bonding stretch vibrations mainly referring to A and C conformers...
May 1, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28544707/the-use-of-co2-laser-in-skin-complications-following-baha-implantation-our-experience-in-the-eight-patients
#2
Maciej Sokola, Katarzyna Malec, Pawel Brzewski, Pawel Dobosz
1 Skin reactions are the most common complications after BAHA implantation. 2 The excess of soft tissue leads to inability to tack the hearing ad to the abutment which prevents the effective use of sound processor. 3 This is a prospective case series of 8 patients with skin overgrowth around the BAHA abutments treated with CO2 laser. 4 This case-series suggest that CO2 laser is safe and easy method for the treatment of the skin overgrowth around the BAHA abutment. 5 This is the first case series presentation of the CO2 laser surgery for treatment of the skin overgrowth around the abutment of BAHA This article is protected by copyright...
May 22, 2017: Clinical Otolaryngology
https://www.readbyqxmd.com/read/28533633/photolithography-free-laser-patterned-hf-acid-resistant-chromium-polyimide-mask-for-rapid-fabrication-of-microfluidic-systems-in-glass
#3
Konstantin O Zamuruyev, Yuriy Zrodnikov, Cristina E Davis
Excellent chemical and physical properties of glass, over a range of operating conditions, make it a preferred material for chemical detection systems in analytical chemistry, biology, and the environmental sciences. However, it is often compromised with SU8, PDMS, or Parylene materials due to the sophisticated mask preparation requirements for wet etching of glass. Here, we report our efforts toward developing a photolithography-free laser-patterned hydrofluoric acid-resistant chromium-polyimide tape mask for rapid prototyping of microfluidic systems in glass...
January 2017: Journal of Micromechanics and Microengineering: Structures, Devices, and Systems
https://www.readbyqxmd.com/read/28524144/-new-approaches-to-the-treatment-of-keratoconjunctivitis-sicca
#4
T N Safonova, O V Gladkova, I A Novikov, V I Boev, A A Fedorov
A new method has been developed for the treatment of severe forms of keratoconjunctivitis sicca (KCS) that involves the use of an original cyclosporine A (CyA) saturated soft contact lens (SCL) together with preservative-free artificial tears therapy. AIM: to evaluate the effectiveness of the newly developed treatment for KCS based on the use of medical SCL saturated with 0.05% CyA. MATERIAL AND METHODS: The patients (43 men, 60 eyes) with severe KCS were divided into 2 groups...
2017: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/28521574/treatment-of-recurrent-pilonidal-cysts-with-nd-yag-laser-report-of-our-experience
#5
F Dragoni, S Moretti, G Cannarozzo, P Campolmi
Purpose Surgical treatment remains the first-line therapy of pilonidal cyst but is associated with high levels of post-operative pain, adverse events and a recurrence rate of 30%. We report our experience with laser hair removal using the Nd-YAG laser for the treatment of pilonidal cyst. Materials and methods Ten patients affected by pilonidal cyst were examined and treated from October 2011 to November 2016. Treatments were carried out using the Nd-YAG laser (Deka M.E.L.A, Calenzano, Florence, Italy) at a wavelength of 1064 nm at 30-day intervals...
May 18, 2017: Journal of Dermatological Treatment
https://www.readbyqxmd.com/read/28513894/the-dentoalveolar-prosthesis-a-novel-approach-in-the-reconstruction-of-hard-and-soft-tissue-deficiencies
#6
James K Doll, Peter Barndt, Gerald Grant
A clinical problem commonly encountered by the advanced restorative dentist is a requirement to replace missing teeth and the supporting alveolus in areas adjacent to healthy or manageable dentition. A potential solution could utilize a dentoalveolar prosthesis fabricated on two or more implants in the edentulous area. The implant substructure, or framework, may be cast, milled, or selectively laser melted from a variety of metals. A superstructure, or ceramic overlay incorporating a ceramic or composite resin gingival tissue component, is constructed to fit over the implant substructure and luted to the substructure with resin cement...
May 17, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28509563/the-adjunctive-soft-tissue-diode-laser-in-orthodontics
#7
Ali Borzabadi-Farahani
Lasers are a relatively new addition to the orthodontist's armamentarium. This article reviews the fundamental basic science of available soft-tissue lasers, with an emphasis on diode lasers, and discusses various adjunct applications of the diode laser for soft-tissue orthodontic procedures. Diode lasers function by cutting with an initiated hot tip and produce minimal to no interaction with healthy dental hard tissue, making them suitable for soft-tissue procedures. The contact cutting mode provides enhanced bloodless site visibility and facility to perform delicate soft tissue procedures, which is important in areas with difficult access...
April 2017: Compendium of Continuing Education in Dentistry
https://www.readbyqxmd.com/read/28505097/nonlinear-parameter-identification-of-a-resonant-electrostatic-mems-actuator
#8
Majed S Al-Ghamdi, Ayman M Alneamy, Sangtak Park, Beichen Li, Mahmoud E Khater, Eihab M Abdel-Rahman, Glenn R Heppler, Mustafa Yavuz
We experimentally investigate the primary superharmonic of order two and subharmonic of order one-half resonances of an electrostatic MEMS actuator under direct excitation. We identify the parameters of a one degree of freedom (1-DOF) generalized Duffing oscillator model representing it. The experiments were conducted in soft vacuum to reduce squeeze-film damping, and the actuator response was measured optically using a laser vibrometer. The predictions of the identified model were found to be in close agreement with the experimental results...
May 13, 2017: Sensors
https://www.readbyqxmd.com/read/28504271/probing-nanofriction-and-aubry-type-signatures-in-a-finite-self-organized-system
#9
J Kiethe, R Nigmatullin, D Kalincev, T Schmirander, T E Mehlstäubler
Friction in ordered atomistic layers plays a central role in various nanoscale systems ranging from nanomachines to biological systems. It governs transport properties, wear and dissipation. Defects and incommensurate lattice constants markedly change these properties. Recently, experimental systems have become accessible to probe the dynamics of nanofriction. Here, we present a model system consisting of laser-cooled ions in which nanofriction and transport processes in self-organized systems with back action can be studied with atomic resolution...
May 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28498264/defining-the-hook-region-anatomy-of-the-guinea-pig-cochlea-for-modeling-of-inner-ear-surgery
#10
Jonathon Lo, Phillip Sale, Sudanthi Wijewickrema, Luke Campbell, Hayden Eastwood, Stephen John O'leary
HYPOTHESIS: The aim of this study was to describe the hook region anatomy of the guinea pig cochlea to identify the optimal surgical approach for cochlear implantation and to determine what anatomical structures are at risk. BACKGROUND: Animal studies investigating hearing loss after cochlear implantation surgery are currently constrained by the lack of a reproducible implantation model. METHODS: Guinea pig cochleae were imaged using thin-sheet laser imaging microscopy...
May 11, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28486807/near-infrared-responsive-gold-layersome-nanoshells
#11
Akram Abbasi, Keunhan Park, Arijit Bose, Geoffrey D Bothun
Anionic liposomes coated with the cationic polyelectrolyte poly-l-lysine (PLL), or layersomes, were used as soft, self-assembled templates for synthesizing gold nanoshells that absorb near infrared radiation. The gold-nanoshells were formed using two techniques (a) direct reduction of tetrachloroauric acid on the layersomes, and (b) reduction of a tetrachloroauric acid/potassium carbonate 'growth' solution on nanosized gold seeds bound to the surface of layersomes. The resulting structures were characterized by transmission and scanning electron microscopy, and visible-near infrared spectroscopy...
May 9, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28481437/effective-light-directed-assembly-of-building-blocks-with-microscale-control
#12
Ngoc-Duy Dinh, Rongcong Luo, Maria Tankeh Asuncion Christine, Weikang Nicholas Lin, Wei-Chuan Shih, James Cho-Hong Goh, Chia-Hung Chen
Light-directed forces have been widely used to pattern micro/nanoscale objects with precise control, forming functional assemblies. However, a substantial laser intensity is required to generate sufficient optical gradient forces to move a small object in a certain direction, causing limited throughput for applications. A high-throughput light-directed assembly is demonstrated as a printing technology by introducing gold nanorods to induce thermal convection flows that move microparticles (diameter = 40 µm to several hundreds of micrometers) to specific light-guided locations, forming desired patterns...
May 8, 2017: Small
https://www.readbyqxmd.com/read/28474068/-fitting-of-the-reconstructed-craniofacial-hard-and-soft-tissues-based-on-2-d-digital-radiographs
#13
Yao-Pu Feng, Min Qiao, Hong Zhou, Yan-Ning Zhang, Xin-Qin Si
PURPOSE: In this study, we reconstructed the craniofacial hard and soft tissues based on the data from digital cephalometric radiographs and laser scanning. The effective fitting of the craniofacial hard and soft tissues was performed in order to increase the level of orthognathic diagnosis and treatment, and promote the communication between doctors and patients. METHODS: A small lead point was put on the face of a volunteer and frontal and lateral digital cephalometric radiographs were taken...
February 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/28463255/3d-whispering-gallery-mode-microlasers-by-direct-laser-writing-and-subsequent-soft-nanoimprint-lithography
#14
Philipp Brenner, Ofer Bar-On, Tobias Siegle, Tobias Leonhard, Raz Gvishi, Carsten Eschenbaum, Heinz Kalt, Jacob Scheuer, Uli Lemmer
We demonstrate the realization of 3D whispering-gallery-mode (WGM) microlasers by direct laser writing (DLW) and their replication by nanoimprint lithography using a soft mold technique ("soft NIL"). The combination of DLW as a method for rapid prototyping and soft NIL offers a fast track towards large scale fabrication of 3D passive and active optical components applicable to a wide variety of materials. A performance analysis shows that surface-scattering-limited Q-factors of replicated resonators as high as 1×10<sup>5</sup> at 635 nm can be achieved with this process combination...
May 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/28462406/effectiveness-of-radio-waves-application-in-modern-general-dental-procedures-an-update
#15
Arslan Qureshi, Sergio Varela Kellesarian, Michael A Pikos, Fawad Javed, Georgios E Romanos
OBJECTIVE: The purpose of the present study was to review indexed literature and provide an update on the effectiveness of high-frequency radio waves (HRW) application in modern general dentistry procedures. DATA SOURCES: Indexed databases were searched to identify articles that assessed the efficacy of radio waves in dental procedures. RESULTS: Radiosurgery is a refined form of electrosurgery that uses waves of electrons at a radiofrequency ranging between 2 and 4 MHz...
April 28, 2017: Quintessence International
https://www.readbyqxmd.com/read/28452751/transverse-gradient-in-apple-type-undulators
#16
M Calvi, C Camenzuli, E Prat, Th Schmidt
Apple-type undulators are globally recognized as the most flexible devices for the production of variable polarized light in the soft X-ray regime, both at synchrotron and free-electron laser facilities. Recently, the implementation of transverse gradient undulators has been proposed to enhance the performance of new generation light sources. In this paper it is demonstrated that Apple undulators do not only generate linear and elliptical polarized light but also variable transverse gradient under certain conditions...
May 1, 2017: Journal of Synchrotron Radiation
https://www.readbyqxmd.com/read/28434428/local-response-of-sialoliths-to-lithotripsy-cues-on-fragmentation-outcome
#17
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
#18
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
#19
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
#20
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
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