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Hannah Brooks, Grant E Haines, M Carly Lin, S Laurie Sanderson
Vortical cross-step filtration in suspension-feeding fish has been reported recently as a novel mechanism, distinct from other biological and industrial filtration processes. Although crossflow passing over backward-facing steps generates vortices that can suspend, concentrate, and transport particles, the morphological factors affecting this vortical flow have not been identified previously. In our 3D-printed models of the oral cavity for ram suspension-feeding fish, the angle of the backward-facing step with respect to the model's dorsal midline affected vortex parameters significantly, including rotational, tangential, and axial speed...
2018: PloS One
Abrar Nizar Alattar, Salwan Yousif Hanna Bede
The aim of this study was to compare the effect of conventional implant site preparation technique and a combination of conventional/piezosurgery preparation on implant stability measured at different time intervals, insertion torque, and preparation time. A randomized controlled study was designed, it included 26 patients who received 54 dental implants randomly assigned to 2 groups; in the control group, implants were installed after conventional preparation with drills whereas the study group received implants after mixed conventional/piezosurgery preparation...
March 20, 2018: Journal of Craniofacial Surgery
Min Kyung Shin, Hee Seung Yang, Hea-Eun Yang, Dae Hyun Kim, Bo Ram Ahn, Hyup Kwon, Ju Hwan Lee, Suk Jung, Hyun Chul Choi, Sun Keaung Yun, Dong Young Ahn, Woo Sob Sim
Objective: To analyze the effect of lumbar strengthening exercise in lower-limb amputees with chronic low back pain. Methods: We included in this prospective study 19 lower-limb amputees who had experienced low back pain for longer than 6 months. Participants were treated with 30-minute lumbar strengthening exercises, twice weekly, for 8 weeks. We used the visual analog scale (VAS), and Oswestry low back pain disability questionnaire, and measured parameters such as iliopsoas length, abdominal muscle strength, back extensor strength, and back extensor endurance...
February 2018: Annals of Rehabilitation Medicine
Shahid Khan, Jonathan M Scholey
Cells from all three domains of life on Earth utilize motile macromolecular devices that protrude from the cell surface to generate forces that allow them to swim through fluid media. Research carried out on archaea during the past decade or so has led to the recognition that, despite their common function, the motility devices of the three domains display fundamental differences in their properties and ancestry, reflecting a striking example of convergent evolution. Thus, the flagella of bacteria and the archaella of archaea employ rotary filaments that assemble from distinct subunits that do not share a common ancestor and generate torque using energy derived from distinct fuel sources, namely chemiosmotic ion gradients and FlaI motor-catalyzed ATP hydrolysis, respectively...
March 19, 2018: Current Biology: CB
Jieun Yoon, Akihiro Kanamori, Keisuke Fujii, Hiroko Isoda, Tomohiro Okura
PURPOSE: Maslinic acid (MA) is a component derived from a natural olive-based extract known to have pharmacological functions that include suppressing inflammation. This study examined how MA, in conjunction with whole-body vibration training (WBVT), can improve knee and muscle function in elderly women with knee osteoarthritis (OA). METHODS: The study was a double-blinded, placebo-controlled, randomized intervention study that enrolled individuals with knee pain...
2018: PloS One
Tania E Sakanaka, Jaspret Gill, Martin D Lakie, Raymond F Reynolds
Individuals may stand with a range of ankle angles. Furthermore, shoes or floor surfaces may elevate or depress their heels. Here we ask how these situations impact ankle stiffness and balance. We performed two studies (each with 10 participants) in which the triceps surae, Achilles tendon and aponeurosis were stretched either passively, by rotating the support surface, or actively by leaning forward. Participants stood freely on footplates which could rotate around the ankle joint axis. Brief, small stiffness-measuring perturbations (<0...
2018: PloS One
Andrew G Geeslin, Jorge Chahla, Gilbert Moatshe, Kyle J Muckenhirn, Bradley M Kruckeberg, Alex W Brady, Ashley Coggins, Grant J Dornan, Alan M Getgood, Jonathan A Godin, Robert F LaPrade
BACKGROUND: The individual kinematic roles of the anterolateral ligament (ALL) and the distal iliotibial band Kaplan fibers in the setting of anterior cruciate ligament (ACL) deficiency require further clarification. This will improve understanding of their potential contribution to residual anterolateral rotational laxity after ACL reconstruction and may influence selection of an anterolateral extra-articular reconstruction technique, which is currently a matter of debate. Hypothesis/Purpose: To compare the role of the ALL and the Kaplan fibers in stabilizing the knee against tibial internal rotation, anterior tibial translation, and the pivot shift in ACL-deficient knees...
March 1, 2018: American Journal of Sports Medicine
Felix G E Dyrna, Florian B Imhoff, Andreas Voss, Sepp Braun, Elifho Obopilwe, John M Apostolakos, Daichi Morikawa, Brendan Comer, Andreas B Imhoff, Augustus D Mazzocca, Knut Beitzel
BACKGROUND: The acromioclavicular (AC) capsule is an important stabilizer against horizontal translation and also contributes to the strut function of the clavicle, which guides rotation of the scapula. To best reproduce the biomechanical properties and the complex 3-dimensional (3D) guidance of the AC joint, detailed knowledge of the contribution of each of the distinctive capsular structures is needed. Purpose/Hypothesis: To perform a detailed biomechanical evaluation of the specific capsular structures of the AC joint and their contribution to translational and rotational stability...
March 1, 2018: American Journal of Sports Medicine
Miltiadis Mitsias, Konstantinos Siormpas, Valeria Pistilli, Anna Trullenque-Eriksson, Marco Esposito
PURPOSE: To compare the clinical outcome of single, partial and complete fixed implant supported prostheses immediately loaded (within 48 h), early loaded at 6 weeks, and conventionally loaded at 3 months (delayed loading). MATERIALS AND METHODS: A total of 54 patients (18 requiring single implants, 18 partial fixed prostheses, and 18 total fixed cross-arch prostheses) were randomised in equal numbers at two private practices to immediate loading (18 patients), early loading (18 patients), and conventional loading (18 patients) according to a parallel group design with three arms...
2018: European Journal of Oral Implantology
Marco Esposito, Rubén Davó, Carlos Marti-Pages, Ada Ferrer-Fuertes, Carlo Barausse, Roberto Pistilli, Daniela Rita Ippolito, Pietro Felice
PURPOSE: To compare the clinical outcome of immediately loaded cross-arch maxillary prostheses supported by zygomatic implants vs conventional implants placed in augmented bone. MATERIALS AND METHODS: A total of 71 edentulous patients with severely atrophic maxillas, who did not have sufficient bone volume to place dental implants or when it was possible to place only two implants in the front area (minimal diameter 3.5 mm and length of 8 mm) and less than 4.0 mm of bone height subantrally, were randomised according to a parallel group design...
2018: European Journal of Oral Implantology
Tingyu Ming, Yang Ding
In undulatory locomotion, torques along the body are required to overcome external forces from the environment and bend the body. Such torques are usually generated by muscles in animals and closely related to muscle activations. In previous studies, researchers observed a single traveling wave pattern of the torque or muscle activation, but the formation of the torque pattern is still not well understood. Using a resistive force theory model, we find that the torque from external resistive forces has a traveling wave pattern with a decreasing speed normalized by the curvature speed as the wave number (the number of wavelengths on the locomotor's body) increases from 0...
March 20, 2018: Bioinspiration & Biomimetics
Bernd Zimmer, Hiba Sino
PURPOSE: To analyze common values of bracket torque (Andrews, Roth, MBT, Ricketts) for their validity in achieving incisor inclinations that are considered normal by different cephalometric standards. METHODS: Using the equations developed in part 1 (eU1(BOP) = 90° - BT(U1) - TCA(U1) + α1 - α2 and eL1(BOP) = 90° - BT(L1) - TCA(L1) + β1 - β2 ) (abbreviations see part 1) and the mean values (± SD) obtained as statistical measures in parts 1 and 2 of the study (α1 and β1 [1...
March 19, 2018: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
Seung-Heon C Baek, Vivek P Amin, Young-Wan Oh, Gyungchoon Go, Seung-Jae Lee, Geun-Hee Lee, Kab-Jin Kim, M D Stiles, Byong-Guk Park, Kyung-Jin Lee
Magnetic torques generated through spin-orbit coupling1-8 promise energy-efficient spintronic devices. For applications, it is important that these torques switch films with perpendicular magnetizations without an external magnetic field9-14 . One suggested approach15 to enable such switching uses magnetic trilayers in which the torque on the top magnetic layer can be manipulated by changing the magnetization of the bottom layer. Spin currents generated in the bottom magnetic layer or its interfaces transit the spacer layer and exert a torque on the top magnetization...
March 19, 2018: Nature Materials
Mehmet Emre Yurttutan, Ahmet Keskin
BACKGROUND: Successful dental implant treatment is directly related to osseointegration. In achieving osseointegration, the surface property of the implant is of great importance. Sandblasting is the most commonly used basic method for modifying the surface. Many companies use different sand particles for surface roughening and claim their sand is the best. This leads clinicians to mix their minds in product selection. In this study, we tried to find the appropriate sand material by working objectively without praising any brand...
March 20, 2018: BMC Oral Health
Rita E Deering, Meredith Cruz, Jonathon W Senefeld, Tatyana Pashibin, Sarah Eickmeyer, Sandra K Hunter
PURPOSE: To determine whether postpartum women (vaginal and Cesarean delivery) have deficits in trunk flexor strength, fatigability and steadiness, compared with nulligravid women, up to 26 weeks postpartum. We hypothesized that postpartum women would be weaker, more fatigable and have greater torque fluctuations than controls, with Cesarean delivery showing greater deficits than vaginal delivery. METHODS: 22 control women (nulligravid) and 29 postpartum women (20-40 years, 19 who delivered via vaginal birth, 13 via Caesarian section) participated...
March 16, 2018: Medicine and Science in Sports and Exercise
Sriraman Priyanka, Gurumoorthy Kaarthikeyan, Jayakumar Doraiswamy Nadathur, Anbarasu Mohanraj, Avinash Kavarthapu
Background: Periodontitis and atherosclerosis represent a chronic inflammatory process. The incidence of periodontitis in cardiac patients with atherosclerosis is a well-established fact. The role of viruses in the etiopathogenesis of both has been proposed. Aim: The aim of the study was to evaluate the prevalence of Torque Teno virus (TTV), Epstein-Barr virus (EBV), and cytomegalovirus (CMV) in cardiac patients with atherosclerosis and coexisting chronic periodontitis (CP)...
November 2017: Journal of Indian Society of Periodontology
Tetsuro Sawata, Masashi Bando, Masayuki Nakayama, Naoko Mato, Hideaki Yamasawa, Masaharu Takahashi, Hiroaki Okamoto, Yukihiko Sugiyama
BACKGROUND: Several studies have reported that viral infections are related to lung cancer. We previously reported the involvement of Torque teno virus (TTV) in patients with lung cancer and idiopathic pulmonary fibrosis. However, the role of TTV in lung cancer growth, and its influence on changes in TTV DNA titers due to idiopathic pulmonary fibrosis (IPF) in lung cancer patients are poorly understood. METHODS: Serum TTV DNA titers were measured in serum samples obtained from patients with lung cancer...
March 2018: Respiratory Investigation
Yuhai Tu, Yuansheng Cao
The performance of a molecular motor, characterized by its power output and energy efficiency, is investigated in the motor design space spanned by the stepping rate function and the motor-track interaction potential. Analytic results and simulations show that a gating mechanism that restricts forward stepping in a narrow window in configuration space is needed for generating high power at physiologically relevant loads. By deriving general thermodynamics laws for nonequilibrium motors, we find that the maximum torque (force) at stall is less than its theoretical limit for any realistic motor-track interactions due to speed fluctuations...
February 2018: Physical Review. E
H Hatami-Marbini
Networks of semiflexible filaments are building blocks of different biological and structural materials such as cytoskeleton and extracellular matrix. The mechanical response of these systems when subjected to an applied strain at zero temperature is often investigated numerically using networks composed of filaments, which are either rigidly welded or pinned together at their crosslinks. In the latter, filaments during deformation are free to rotate about their crosslinks while the relative angles between filaments remain constant in the former...
February 2018: Physical Review. E
Yongxi Ou, D C Ralph, R A Buhrman
Robust spin Hall effects (SHE) have recently been observed in nonmagnetic heavy metal systems with strong spin-orbit interactions. These SHE are either attributed to an intrinsic band-structure effect or to extrinsic spin-dependent scattering from impurities, namely, side jump or skew scattering. Here we report on an extraordinarily strong spin Hall effect, attributable to spin fluctuations, in ferromagnetic Fe_{x}Pt_{1-x} alloys near their Curie point, tunable with x. This results in a dampinglike spin-orbit torque being exerted on an adjacent ferromagnetic layer that is strongly temperature dependent in this transition region, with a peak value that indicates a lower bound 0...
March 2, 2018: Physical Review Letters
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