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https://www.readbyqxmd.com/read/28727182/probing-anisotropic-thermal-conductivity-of-transition-metal-dichalcogenides-mx2-m-mo-w-and-x-s-se-using-time-domain-thermoreflectance
#1
Puqing Jiang, Xin Qian, Xiaokun Gu, Ronggui Yang
Transition metal dichalcogenides (TMDs) are a group of layered 2D semiconductors that have shown many intriguing electrical and optical properties. However, the thermal transport properties in TMDs are not well understood due to the challenges in characterizing anisotropic thermal conductivity. Here, a variable-spot-size time-domain thermoreflectance approach is developed to simultaneously measure both the in-plane and the through-plane thermal conductivity of four kinds of layered TMDs (MoS2 , WS2 , MoSe2 , and WSe2 ) over a wide temperature range, 80-300 K...
July 20, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28723073/experimental-determination-of-the-ionization-energies-of-mose2-ws2-and-mos2-on-sio2-using-photoemission-electron-microscopy
#2
Kunttal Keyshar, Morgann Berg, Xiang Zhang, Robert Vajtai, Gautam Gupta, Calvin K Chan, Thomas E Beechem, Pulickel M Ajayan, Aditya D Mohite, Taisuke Ohta
The values of the ionization energies of transition metal dichalcogenides (TMDs) are needed to assess their potential usefulness in semiconductor heterojunctions for high-performance optoelectronics. Here, we report on the systematic determination of ionization energies for three prototypical TMD monolayers (MoSe2, WS2, and MoS2) on SiO2 using photoemission electron microscopy with deep ultraviolet illumination. The ionization energy displays a progressive decrease from MoS2, to WS2, to MoSe2, in agreement with predictions of density functional theory calculations...
July 19, 2017: ACS Nano
https://www.readbyqxmd.com/read/28722346/progress-of-large-scale-synthesis-and-electronic-device-application-of-two-dimensional-transition-metal-dichalcogenides
#3
REVIEW
Xiongfei Song, Zhongxun Guo, Qiaochu Zhang, Peng Zhou, Wenzhong Bao, David Wei Zhang
The recent exploration of semiconducting two-dimensional (2D) transition metal dichalcogenides (TMDs) with atomic thickness has taken both the scientific and technological communities by storm. Extensively investigated TMD that are accessible by large-scale synthetic methods materials are remarkably stable, such as MoS2 and WSe2 . They allow superior gate control due to their 2D nature and favorable electronic transport properties, thus suggesting a bright future for digital and RF electronics. In this review, the latest developments in the controlled synthesis of large scale TMDs are firstly introduced by discussing various approaches...
July 19, 2017: Small
https://www.readbyqxmd.com/read/28714016/elastin%C3%A2-derived-peptides-are-involved-in-the-processes-of-human-temporomandibular-disorder-by-inducing-inflammatory-responses-in-synovial-cells
#4
Kazuhiko Kobayashi, Rei Jokaji, Mayuko Miyazawa-Hira, Shigeyuki Takatsuka, Akira Tanaka, Kazuhiro Ooi, Hiroyuki Nakamura, Shuichi Kawashiri
Temporomandibular joint dysfunction (TMD) is a collection of clinical symptoms that involve masticatory muscles and the temporomandibular joint (TMJ). Common symptoms include limited jaw motion and joint sound/pain, along with TMJ disc displacement. TMD is frequently associated with synovitis, a chronic inflammation of the synovium. Fibroblast‑like synovial cells have been identified to produce several inflammatory mediators and may have an important role in the progression of TMJ inflammation. Degradation of the extracellular matrix molecule elastin may lead to the release of bioactive peptides...
July 15, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28713764/assessing-prevalence-of-temporomandibular-disorders-among-university-students-a-questionnaire-study
#5
R Karthik, M I Fathima Hafila, C Saravanan, N Vivek, P Priyadarsini, B Ashwath
AIM: The aim of this study is to assess the prevalence of temporomandibular disorders (TMDs) among university students. OBJECTIVES: The etiology of TMD is of multifactorial, and our study is designed to assess the prevalence of TMD in an institution within a university. Various parameters including trauma, malocclusion, stress assessment - its correlation with the timing, the duration of TMD in meeting the deadlines, and examinations have been assessed. MATERIALS AND METHODS: A standard questionnaire-based study with modified Fonseca anamnestic index is used...
June 2017: Journal of International Society of Preventive & Community Dentistry
https://www.readbyqxmd.com/read/28698655/electronic-bandstructure-and-van-der-waals-coupling-of-rese2-revealed-by-high-resolution-angle-resolved-photoemission-spectroscopy
#6
Lewis S Hart, James L Webb, Sara Dale, Simon J Bending, Marcin Mucha-Kruczynski, Daniel Wolverson, Chaoyu Chen, José Avila, Maria C Asensio
ReSe2 and ReS2 are unusual compounds amongst the layered transition metal dichalcogenides as a result of their low symmetry, with a characteristic in-plane anisotropy due to in-plane rhenium 'chains'. They preserve inversion symmetry independent of the number of layers and, in contrast to more well-known transition metal dichalcogenides, bulk and few-monolayer Re-TMD compounds have been proposed to behave as electronically and vibrational decoupled layers. Here, we probe for the first time the electronic band structure of bulk ReSe2 by direct nanoscale angle-resolved photoemission spectroscopy...
July 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28698248/ganglioside-glycosyltransferases-are-s-acylated-at-conserved-cysteine-residues-involved-in-homodimerization
#7
Sabrina Chumpen Ramirez, Fernando M Ruggiero, Jose Luis Daniotti, Javier Valdez Taubas
Ganglioside glycosyltransferases (GGTs) are type-II membrane proteins bearing a short N-terminal cytoplasmic tail, a transmembrane domain (TMD), and a lumenal catalytic domain. The expression and activity of these enzymes largely determine the quality of the glycolipids that decorate mammalian cells membranes. Many glycosyltransferases are themselves glycosylated and this is important for their proper localisation, but few if any other post-translational modifications of these proteins have been reported. Here we show that the GGTs, ST3Gal-V, ST8Sia-I, and β4GalNAcT-I are S-acylated at conserved cysteine residues located close the cytoplasmic border of their TMDs...
July 11, 2017: Biochemical Journal
https://www.readbyqxmd.com/read/28692747/controllable-synthesis-of-atomically-thin-type-ii-weyl-semimetal-wte2-nanosheets-an-advanced-electrode-material-for-all-solid-state-flexible-supercapacitors
#8
Peng Yu, Wei Fu, Qingsheng Zeng, Junhao Lin, Cheng Yan, Zhuangchai Lai, Bijun Tang, Kazu Suenaga, Hua Zhang, Zheng Liu
Compared with 2D S-based and Se-based transition metal dichalcogenides (TMDs), Te-based TMDs display much better electrical conductivities, which will be beneficial to enhance the capacitances in supercapacitors. However, to date, the reports about the applications of Te-based TMDs in supercapacitors are quite rare. Herein, the first supercapacitor example of the Te-based TMD is reported: the type-II Weyl semimetal 1Td WTe2 . It is demonstrated that single crystals of 1Td WTe2 can be exfoliated into the nanosheets with 2-7 layers by liquid-phase exfoliation, which are assembled into air-stable films and further all-solid-state flexible supercapacitors...
July 10, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28691465/bilateral-coronoid-hyperplasia-a-report-of-six-cases
#9
M Romano, G Porcellini, D Rossi, A Bolzoni, A B Giannì, F J Silvestre, A Baj
Bilateral coronoid process hyperplasia is a rare condition defined as an abnormal elongation of the mandibular coronoid process, formed of histologically normal bone. Coronoid process hyperplasia usually develops progressively, and the clinical symptoms are often similar to those of temporomandibular joint disorders (TMD). Therefore, it is often misdiagnosed as TMD initially. From 2013 to 2016, six patients were referred to our maxillofacial surgery unit by their dentist, to evaluate mouth opening with suspected TMJ disorder...
April 2017: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/28688272/does-pain-in-the-masseter-and-anterior-temporal-muscles-influence-maximal-bite-force
#10
Marcelo Coelho Goiato, Paulo Renato Junqueira Zuim, Amália Moreno, Daniela Micheline Dos Santos, Emily Vivianne Freitas da Silva, Fernanda Pereira de Caxias, Karina Helga Leal Turcio
OBJECTIVE: The aim of this study was to evaluate changes in pain and muscle force, and the relationship between them, in patients with muscle pain and bruxism, prior to and after treatment. METHODS: Thirty women with bruxism and myofascial pain (Ia) were included in this study. Sleep bruxism diagnosis was made based on clinical diagnostic criteria, and awake bruxism diagnosis was made by patient questionnaires and the presence of tooth wear. The diagnosis of myofascial pain was established according to the Research Diagnostic Criteria for Temporomandibular Disorders (RDC-TMD)...
June 23, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28682279/temporomandibular-pain-caused-by-sleep-disorders-a-review-and-case-report
#11
Daniel F Babiec
Patients who present to the general dentist's office with complaints of temporomandibular joint pain may exhibit signs and symptoms such as muscle soreness, bruxism, joint soreness, limited range of movement, altered movement, and facial pain as well as tooth chipping or tooth movement. After examinations, radiographic evaluations, and a review of medical history, dentists may have a bias toward regarding these symptoms as oral or dental in origin. After a diagnosis of a temporomandibular disorder (TMD), bruxism, or muscular spasms due to occlusal instabilities is established, the treatment protocol often includes an oral appliance (such as a nightguard), exercises, and pharmacologic agents...
July 2017: General Dentistry
https://www.readbyqxmd.com/read/28680063/bi-2212-1t-tas2-van-der-waals-junctions-interplay-of-proximity-induced-high-t-c-superconductivity-and-cdw-order
#12
Ang J Li, Xiaochen Zhu, G R Stewart, Arthur F Hebard
Understanding the coexistence, competition and/or cooperation between superconductivity and charge density waves (CDWs) in the transition metal dichalcogenides (TMDs) is an elusive goal which, when realized, promises to reveal fundamental information on this important class of materials. Here, we use four-terminal current-voltage measurements to study the Van der Waals interface between freshly exfoliated flakes of the high-T c superconductor, Bi-2212, and the CDW-dominated TMD layered material, 1T-TaS2. For highly transparent barriers, there is a pronounced Andreev reflection feature providing evidence for proximity-induced high-T c superconductivity in 1T-TaS2 with a surprisingly large energy gap (~20 meV) equal to half that of intrinsic Bi-2212 (~40 meV)...
July 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28666164/quantitative-determination-of-dobutamine-in-newborn-pig-plasma-samples-by-hplc-ms-ms
#13
O E Albóniga, M L Alonso, M E Blanco, O González, A Grisaleña, M A Campanero, R M Alonso
A novel gradient reverse phase high performance liquid chromatography tandem mass spectrometry (HPLC/MS-MS) was performed as a method for the determination of dobutamine hydrochloride (DOB) in newborn pig plasma samples. It was developed and validated after optimization of sample treatment and various chromatographic and mass spectrometric conditions. Trimethoxydobutamine (TMD) was used as internal standard. Heptafluorobutyric acid (HFBA) and ethyl acetate were used for the treatment of plasma samples. The separation of dobutamine and internal standard was done using a Kinetex F5 (50×2...
June 21, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28660990/-venopunction-of-the-cubital-vein-as-an-alternative-approach-for-cgrp-plasma-level-evaluation-in-tmd-patients
#14
Aleksandra Nitecka-Buchta, Bogdan Marek, Jolanta Batko Kapustecka, Stefan Baron
INTRODUCTION: Calcitonin gene-related peptide is an important vasodilator. It plays an important role in the metabolism of chewing muscles. The aim of the study was to evaluate the plasma level of CGRP in patients with myofascial pain (RDC/TMD Ia) and myofascial pain with limited opening (RDC/TMD Ib) before and after occlusal splint therapy (Michigan splint). MATERIAL AND METHODS: A randomised trial was performed including 39 patients (males = 3, females = 36). Blood samples were taken from the external jugular vein (JUG) and cubital vein (CUB) before and after 30 days of occlusal splint therapy...
2017: Endokrynologia Polska
https://www.readbyqxmd.com/read/28660343/tissue-mineral-density-measured-at-the-sub-millimetre-scale-can-provide-reliable-statistics-of-elastic-properties-of-bone-matrix
#15
Davide Gagliardi, Salah Naili, Christophe Desceliers, Vittorio Sansalone
Reliability of multiscale models of bone is related to the accuracy of the experimental information available on bone microstructure. X-ray-based imaging techniques allow to inspect bone structure and mineralization in vitro at the micrometre scale. However, spatial resolution achievable in vivo is much coarser and can produce blurry, uncertain information on bone microstructure. Working with uncertain data calls for new modelling paradigms able to propagate uncertainty through the scales. In this paper we investigate the effects of uncertain bone mineralization on the elastic coefficients of the bone matrix...
June 28, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28653747/pharmacological-treatment-of-orofacial-pain-health-technology-assessment-including-a-systematic-review-with-network-meta-analysis
#16
REVIEW
B Häggman-Henrikson, P Alstergren, T Davidson, Ed Högestätt, P Östlund, S Tranaeus, S Vitols, T List
This health technology assessment evaluated the efficacy of pharmacological treatment in patients with orofacial pain. Randomised controlled trials were included if they reported pharmacological treatment in patients ≥18 years with chronic (≥3 months) orofacial pain. Patients were divided into subgroups: TMD-muscle [Temporomandibular disorders (TMD) mainly associated with myalgia]; TMD-joint (TMD mainly associated with temporomandibular joint pain); and Burning mouth syndrome (BMS). The primary outcome was pain intensity reduction after pharmacological treatment...
June 27, 2017: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/28650440/probing-dark-excitons-in-atomically-thin-semiconductors-via-near-field-coupling-to-surface-plasmon-polaritons
#17
You Zhou, Giovanni Scuri, Dominik S Wild, Alexander A High, Alan Dibos, Luis A Jauregui, Chi Shu, Kristiaan De Greve, Kateryna Pistunova, Andrew Y Joe, Takashi Taniguchi, Kenji Watanabe, Philip Kim, Mikhail D Lukin, Hongkun Park
Transition metal dichalcogenide (TMD) monolayers with a direct bandgap feature tightly bound excitons, strong spin-orbit coupling and spin-valley degrees of freedom. Depending on the spin configuration of the electron-hole pairs, intra-valley excitons of TMD monolayers can be either optically bright or dark. Dark excitons involve nominally spin-forbidden optical transitions with a zero in-plane transition dipole moment, making their detection with conventional far-field optical techniques challenging. Here, we introduce a method for probing the optical properties of two-dimensional materials via near-field coupling to surface plasmon polaritons (SPPs)...
June 26, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28650155/probing-interface-defects-in-top-gated-mos2-transistors-with-impedance-spectroscopy
#18
Peng Zhao, Angelica Azcatl, Yuri Y Gomeniuk, Pavel Bolshakov, Michael Schmidt, Stephen J McDonnell, Christopher L Hinkle, Paul K Hurley, Robert M Wallace, Chadwin D Young
The electronic properties of the HfO2/MoS2 interface were investigated using multifrequency capacitance-voltage (C-V) and current-voltage characterization of top-gated MoS2 metal-oxide-semiconductor field effect transistors (MOSFETs). The analysis was performed on few layer (5-10) MoS2 MOSFETs fabricated using photolithographic patterning with 13 and 8 nm HfO2 gate oxide layers formed by atomic layer deposition after in-situ UV-O3 surface functionalization. The impedance response of the HfO2/MoS2 gate stack indicates the existence of specific defects at the interface, which exhibited either a frequency-dependent distortion similar to conventional Si MOSFETs with unpassivated silicon dangling bonds or a frequency dispersion over the entire voltage range corresponding to depletion of the HfO2/MoS2 surface, consistent with interface traps distributed over a range of energy levels...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28646133/effects-of-energetic-ion-irradiation-on-wse2-sic-heterostructures
#19
Tan Shi, Roger C Walker, Igor Jovanovic, Joshua A Robinson
The remarkable electronic properties of layered semiconducting transition metal dichalcogenides (TMDs) make them promising candidates for next-generation ultrathin, low-power, high-speed electronics. It has been suggested that electronics based upon ultra-thin TMDs may be appropriate for use in high radiation environments such as space. Here, we present the effects of irradiation by protons, iron, and silver ions at MeV-level energies on a WSe2/6H-SiC vertical heterostructure studied using XPS and UV-Vis-NIR spectroscopy...
June 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28645100/interferential-effect-of-the-over-erupted-third-molar-on-chewing-movement
#20
Shaoxiong Guo, Baoyong Li, Kun Qi, Mian Zhang, Han Zhang, Donghui Guo, Xiaodong Liu, Meiqing Wang
OBJECTIVE: To clarify whether over-eruption of the mandibular third molar can disturb chewing movement. METHODS: Eighteen patients with a unilateral mandibular over-erupted third molar confirmed by both study cast observation and T-scan occlusal detection were selected from a sample of patients with complaints of temporomandibular disorder (TMD) symptoms. A unilateral gum-chewing trace was recorded separately for left and right side chewing by an electrognathography system...
June 15, 2017: Archives of Oral Biology
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