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https://www.readbyqxmd.com/read/28809534/ordered-and-atomically-perfect-fragmentation-of-layered-transition-metal-dichalcogenides-via-mechanical-instabilities
#1
Ming Chen, Juan Xia, Jiadong Zhou, Qingsheng Zeng, Kaiwei Li, Kazunori Fujisawa, Wei Fu, Ting Zhang, Jing Zhang, Zhe Wang, Zhixun Wang, Xiaoting Jia, Mauricio Terrones, Ze Xiang Shen, Zheng Liu, Lei Wei
Thermoplastic polymers subjected to a continuous tensile stress experience a state of mechanical instabilities, resulting in neck formation and propagation. The necking process with strong localized strain enables the transformation of initially brittle polymeric materials into robust, flexible, and oriented forms. Here we harness the polymer-based mechanical instabilities to control the fragmentation of atomically thin transition metal dichalcogenides (TMDs). We develop a simple and versatile nanofabrication tool to precisely fragment atom-thin TMDs sandwiched between thermoplastic polymers into ordered and atomically perfect TMD nanoribbons in arbitrary directions regardless of the crystal structures, defect content, and original geometries...
August 15, 2017: ACS Nano
https://www.readbyqxmd.com/read/28808001/two-transmembrane-dimers-of-the-bovine-papillomavirus-e5-oncoprotein-clamp-the-pdgf-%C3%AE-receptor-in-an-active-dimeric-conformation
#2
Alexander G Karabadzhak, Lisa M Petti, Francisco N Barrera, Anne P B Edwards, Andrés Moya-Rodríguez, Yury S Polikanov, J Alfredo Freites, Douglas J Tobias, Donald M Engelman, Daniel DiMaio
The dimeric 44-residue E5 protein of bovine papillomavirus is the smallest known naturally occurring oncoprotein. This transmembrane protein binds to the transmembrane domain (TMD) of the platelet-derived growth factor β receptor (PDGFβR), causing dimerization and activation of the receptor. Here, we use Rosetta membrane modeling and all-atom molecular dynamics simulations in a membrane environment to develop a chemically detailed model of the E5 protein/PDGFβR complex. In this model, an active dimer of the PDGFβR TMD is sandwiched between two dimers of the E5 protein...
August 14, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28805363/selective-chemical-response-of-transition-metal-dichalcogenides-and-metal-dichalcogenides-in-ambient-conditions
#3
Jun Hong Park, Suresh Vishwanath, Steven F Wolf, Kehao Zhang, Iljo Kwak, Mary Edmonds, Michael Breeden, Xinyu Liu, Margaret Dobrowolska, Jacek Furdyna, Joshua A Robinson, Huili Grace Xing, Andrew C Kummel
To fabricate practical devices based on semiconducting two-dimensional (2D) materials, the source, channel, and drain materials are exposed to ambient air. However, the response of layered 2D materials to air has not been fully elucidated at the molecular level. In the present report, the effects of air exposure on transition metal dichalcogenides (TMD) and metal dichalcogenides (MD) are studied using ultra-high vacuum scanning tunneling microscopy (STM). The effects of a one-day ambient air exposure on MBE grown WSe2, powder vaporization (PV) grown MoS2, and MBE SnSe2, are compared...
August 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28805272/clinical-phenotype-of-south-east-asian-temporomandibular-disorder-patients-with-upper-airway-resistance-syndrome
#4
David K L Tay, Kenny P Pang
OBJECTIVE: To document the clinical phenotype of temporomandibular disorder (TMD) patients with concomitant upper airway resistance syndrome (UARS) in a South East Asian population. STUDY DESIGN: A multi-center prospective series of 86 TMD patients (26 men and 60 women / mean age 35.7 years) with UARS. All had excessive daytime sleepiness, high arousal index and apnea-hypopnea index (AHI)<5 RESULTS: The mean body mass index was 20.1, mean arousal index 16.2, mean respiratory disturbance index 19...
August 14, 2017: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/28805189/dielectric-environment-and-or-random-disorder-effects-on-free-charged-and-localized-excitonic-states-in-monolayer-ws-sub-2-sub
#5
Aida Hichri, Imen Ben Amara, Sabrine Ayari, Sihem Jaziri
Excitonic effects play an important role on the optoelectronic behavior of atomically thin two-dimensional (2D) crystals of the WS2 transition metal dichalcogenide (TMD). In this paper, neutral and charged exciton behaviors in monolayer WS2 are handled within effective-mass approximation in which the critical parameters are ensured from our ab-initio calculations. Firstly, we reveal an exciton series with a novel energy dependence on the orbital angular momentum. Considerable control of the dielectric environment on neutral and charged excitons binding energies is elucidated...
August 14, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28804935/confirming-the-mechanisms-behind-cognitive-behavioural-therapy-effectiveness-in-chronic-pain-using-structural-equation-modeling-in-a-sample-of-patients-with-temporomandibular-disorders
#6
Estrella Durá-Ferrandis, Maite Ferrando-García, Mª José Galdón-Garrido, Yolanda Andreu-Vaillo
OBJECTIVE: To evaluate whether therapeutic mechanisms assumed to explain the effect of cognitive behavioural therapy (CBT) concerning temporomandibular symptoms are confirmed by structural equation modelling. METHOD: Patients were randomly assigned to either an experimental group receiving CBT (N = 41) or a standard therapy control group (N = 31). Subjects were assessed before and after intervention using mediator variables hypothesized according to the CBT model, as well as outcome variables and other socio-demographic and clinical measures...
August 14, 2017: Clinical Psychology & Psychotherapy
https://www.readbyqxmd.com/read/28803966/a-chimeric-prokaryotic-eukaryotic-pentameric-ligand-gated-ion-channel-reveals-interactions-between-the-extracellular-and-transmembrane-domains-shape-neurosteroid-modulation
#7
Borna Ghosh, Tzu-Wei Tsao, Cynthia Czajkowski
Pentameric ligand-gated ion channels (pLGICs) are the targets of several clinical and endogenous allosteric modulators including anesthetics and neurosteroids. Molecular mechanisms underlying allosteric drug modulation are poorly understood. Here, we constructed a chimeric pLGIC by fusing the extracellular domain (ECD) of the proton-activated, cation-selective bacterial channel GLIC to the transmembrane domain (TMD) of the human ρ1 chloride-selective GABAAR, and tested the hypothesis that drug actions are regulated locally in the domain that houses its binding site...
August 10, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28802835/residues-in-the-eighth-transmembrane-domain-of-the-proton-coupled-folate-transporter-slc46a1-play-an-important-role-in-defining-the-aqueous-translocation-pathway-and-in-folate-substrate-binding
#8
Srinivas Aluri, Rongbao Zhao, Andras Fiser, I David Goldman
The proton-coupled folate transporter (PCFT-SLC46A1) is required for intestinal folate absorption and folate transport across the choroid plexus. This report addresses the structure/function of the 8th transmembrane helix. Based upon biotinylation of cysteine-substituted residues by MTSEA-biotin, 14 contiguous exofacial residues to Leu316 were accessible to the extracellular compartment of the 23 residues in this helix (Leu303-Leu325). Pemetrexed blocked biotinylation of six Cys-substituted residues deep within the helix implicating an important role for this region in folate binding...
August 9, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28800304/role-of-upper-cervical-spine-in-temporomandibular-disorders
#9
Cristian Rodolfo Raya, Gustavo Plaza-Manzano, Daniel Pecos-Martín, Alejandro Ferragut-Garcías, Patricia Martín-Casas, Tomás Gallego-Izquierdo, Natalia Romero-Franco
BACKGROUND: Temporomandibular disorders (TMDs) are prevalent multifactorial pathologies in which the actual role of the cervical region position is controversial. OBJECTIVE: To analyze the relationship between the position of the upper cervical rachis and the symptoms of TMD. METHODS: Sixty women were recruited to this study. All of them completed a questionnaire and were subjected to a temporomadibular exploration to create two different groups: a TMD Group (n= 30) - women who suffered TMD symptoms according to the evaluation; and a control group (n= 30) - women who were free from TMD symptoms...
August 3, 2017: Journal of Back and Musculoskeletal Rehabilitation
https://www.readbyqxmd.com/read/28792365/frequency-of-temporomandibular-disorders-diagnoses-based-on-rdc-tmd-in-a-polish-patient-population
#10
Magdalena A Osiewicz, Frank Lobbezoo, Bartłomiej W Loster, Jolanta E Loster, Daniele Manfredini
OBJECTIVE: To assess the frequency and age distribution of Axis I and Axis II diagnoses among Polish patients with temporomandibular disorders (TMD). METHOD: One hundred sixty-three (n = 163) consecutive adult patients seeking TMD treatment were assessed based on the Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) guidelines. Descriptive statistics on the frequency of diagnoses and mean age of the diagnostic groups was performed. RESULT: Frequency of muscle disorders, disc displacements, and other joint disorders was 56...
August 9, 2017: Cranio: the Journal of Craniomandibular Practice
https://www.readbyqxmd.com/read/28791048/specific-central-nervous-system-medications-are-associated-with-temporomandibular-joint-symptoms
#11
John K Drisdale Iii, Monica G Thornhill, Alexandre R Vieira
AIMS: There is evidence of association between bruxism and the increasingly common central nervous system stimulants prescribed for attention deficit hyperactivity disorder (ADHD), as well as the selective serotonin reuptake inhibitors (SSRIs) often prescribed for depression or anxiety. However, the evidence is not clear on whether these medications inducing bruxism are directly associated with temporomandibular joint disorder (TMD). The aim of this work is to evaluate whether these medications are associated with TMD symptoms...
2017: International Journal of Dentistry
https://www.readbyqxmd.com/read/28782524/the-psycho-hormonal-influence-of-anaerobic-fatigue-on-semi-professional-female-soccer-players
#12
Adéle Broodryk, Cindy Pienaar, David Edwards, Martinique Sparks
Globally it is assumed that high-intensity activities are the general cause of fatigue experienced during a soccer match. However, little is known about the hormonal and psychological effects of fatigue due to these activities on semi-professional female soccer players. Forty-seven female players (22.0±2.7y) from a tertiary education institution volunteered for the study. Their cortisol values (saliva sample), anxiety [Spielberger State-trait anxiety inventory questionnaire (STAI)] and mood scores [Incredible Short Profile of Mood states questionnaire (ISP)] were taken an hour and immediately prior to, and 15min after an anaerobic fatiguing test (AFT)...
August 4, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28782025/observation-of-ultralong-valley-lifetime-in-wse2-mos2-heterostructures
#13
Jonghwan Kim, Chenhao Jin, Bin Chen, Hui Cai, Tao Zhao, Puiyee Lee, Salman Kahn, Kenji Watanabe, Takashi Taniguchi, Sefaattin Tongay, Michael F Crommie, Feng Wang
The valley degree of freedom in two-dimensional (2D) crystals recently emerged as a novel information carrier in addition to spin and charge. The intrinsic valley lifetime in 2D transition metal dichalcogenides (TMD) is expected to be markedly long due to the unique spin-valley locking behavior, where the intervalley scattering of the electron simultaneously requires a large momentum transfer to the opposite valley and a flip of the electron spin. However, the experimentally observed valley lifetime in 2D TMDs has been limited to tens of nanoseconds thus far...
July 2017: Science Advances
https://www.readbyqxmd.com/read/28771403/structural-insight-into-the-activation-of-a-class-b-g-protein-coupled-receptor-by-peptide-hormones-in-live-human-cells
#14
Lisa Seidel, Barbara Zarzycka, Saheem A Zaidi, Vsevolod Katritch, Irene Coin
The activation mechanism of class B G-protein-coupled receptors (GPCRs) remains largely unknown. To characterize conformational changes induced by peptide hormones, we investigated interactions of the class B corticotropin-releasing factor receptor type 1 (CRF1R) with two peptide agonists and three peptide antagonists obtained by N-truncation of the agonists. Surface mapping with genetically encoded photo-crosslinkers and pair-wise crosslinking revealed distinct footprints of agonists and antagonists on the transmembrane domain (TMD) of CRF1R and identified numerous ligand-receptor contact sites, directly from the intact receptor in live human cells...
August 3, 2017: ELife
https://www.readbyqxmd.com/read/28767217/synthesis-and-physical-properties-of-phase-engineered-transition-metal-dichalcogenide-monolayer-heterostructures
#15
Carl H Naylor, William M Parkin, Zhaoli Gao, Joel Berry, Songsong Zhou, Qicheng Zhang, John Brandon McClimon, Liang Z Tan, Christopher E Kehayias, Meng-Qiang Zhao, Ram S Gona, Robert W Carpick, Andrew M Rappe, David J Srolovitz, Marija Drndic, Alan T Charlie Johnson
Heterostructures of transition metal dichalcogenides (TMDs) offer the attractive prospect of combining distinct physical properties derived from different TMD structures. Here we report direct chemical vapor deposition of in-plane monolayer heterostructures based on 1H-MoS2 and 1T'-MoTe2. The large lattice mismatch between these materials led to intriguing phenomena at their interface. Atomic force microscopy indicated buckling in the 1H region. Tip-enhanced Raman spectroscopy showed mode structure consistent with Te substitution in the 1H region during 1T'-MoTe2 growth...
August 2, 2017: ACS Nano
https://www.readbyqxmd.com/read/28766944/low-temperature-solution-synthesis-of-transition-metal-dichalcogenide-alloys-with-tunable-optical-properties
#16
Yifan Sun, Kazunori Fujisawa, Zhong Lin, Yu Lei, Jared S Mondschein, Mauricio Terrones, Raymond E Schaak
Nanostructures of layered transition metal dichalcogenide (TMD) alloys with tunable compositions are promising candidates for a broad scope of applications in electronics, optoelectronics, topological devices, and catalysis. Most TMD alloy nanostructures are synthesized as films on substrates using gas-phase methods at high temperatures. However, lower temperature solution routes present an attractive alternative with the potential for larger-scale, higher-yield syntheses of freestanding, higher surface area materials...
August 16, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28766677/vibrational-contributions-to-intrinsic-friction-in-charged-transition-metal-dichalcogenides
#17
Antonio Cammarata, Tomas Polcar
Vibrational contributions to intrinsic friction in layered transition metal dichalcogenides (TMDs) have been studied at different charge contents. We find that any deviation from charge neutrality produces complex rearrangements of atomic positions and electronic distributions, and consequent phase transitions. Upon charge injection, cell volume expansion is observed, due to charge accumulation along an axis orthogonal to the layer planes. Such accumulation is accounted for by the d3z(2)-r(2) orbital of the transition metal and it is regulated by the Pt2g,eg orbital polarization...
August 2, 2017: Nanoscale
https://www.readbyqxmd.com/read/28765464/the-effect-of-new-oral-care-technologies-on-the-need-for-dentists-in-2040
#18
Peter M Milgrom, Jeremy A Horst
This article addresses changes in technology of oral self-care or professional care that may increase or decrease the demand for dentists by 2040. The focus is on dental caries, periodontitis, and temporomandibular joint disorders (TMD), as the first two are the main areas of current practice and because TMD is an area for growth. To address this question, the authors examined the scientific literature and government registries to identify recent or soon-to-be-available technologies. They also examined the state of translational efficiency, dissemination, and adoption of advances into dental practice...
August 2017: Journal of Dental Education
https://www.readbyqxmd.com/read/28760553/genome-wide-identification-of-sweet-orange-citrus-sinensis-metal-tolerance-proteins-and-analysis-of-their-expression-patterns-under-zinc-manganese-copper-and-cadmium-toxicity
#19
Xing-Zheng Fu, Ya-Hua Tong, Xue Zhou, Li-Li Ling, Chang-Pin Chun, Li Cao, Ming Zeng, Liang-Zhi Peng
Plant metal tolerance proteins (MTPs) play important roles in heavy metal homeostasis; however, related information in citrus plants is limited. Citrus genome sequencing and assembly have enabled us to perform a systematic analysis of the MTP gene family. We identified 12 MTP genes in sweet orange, which we have named as CitMTP1 and CitMTP3 to CitMTP12 based on their sequence similarity to Arabidopsis thaliana MTPs. The CitMTPs were predicted to encode proteins of 864 to 2556 amino acids in length that included 4 to 6 putative transmembrane domains (TMDs)...
July 28, 2017: Gene
https://www.readbyqxmd.com/read/28760283/idiopathic-condylar-resorptions-3-dimensional-condylar-bony-deformation-signs-and-symptoms
#20
Kasper Dahl Kristensen, Bjarke Schmidt, Peter Stoustrup, Thomas Klit Pedersen
INTRODUCTION: Our aim was to describe 3-dimensional condylar deformation of the temporomandibular joint (TMJ) and symptoms and signs of temporomandibular dysfunction (TMD) in patients with idiopathic condylar resorption (ICR). METHODS: We included 25 patients with ICR and 25 controls. We performed cone-beam computed tomographic scans and analyzed condylar width, length, and height as well as the condylar axial angle and the condylar neck angle. TMJ cross sections were evaluated for degenerative characteristics and location of bony deformations...
August 2017: American Journal of Orthodontics and Dentofacial Orthopedics
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