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https://read.qxmd.com/read/30760731/clinical-potential-of-a-new-approach-to-mri-acceleration
#1
Nadine L Dispenza, Sebastian Littin, Maxim Zaitsev, R Todd Constable, Gigi Galiana
Fast ROtary Nonlinear Spatial ACquisition (FRONSAC) was recently introduced as a new strategy that applies nonlinear gradients as a small perturbation to improve image quality in highly undersampled MRI. In addition to experimentally showing the previously simulated improvement to image quality, this work introduces the insight that Cartesian-FRONSAC retains many desirable features of Cartesian imaging. Cartesian-FRONSAC preserves the existing linear gradient waveforms of the Cartesian sequence while adding oscillating nonlinear gradient waveforms...
February 13, 2019: Scientific Reports
https://read.qxmd.com/read/30760162/preliminary-evaluation-of-a-predictive-controller-for-a-rotary-blood-pump-based-on-pulmonary-oxygen-gas-exchange
#2
Feng Huang, Zhe Gou, Yang Fu
Physiological control of rotary blood pumps is becoming increasingly necessary for clinical use. In this study, the mean oxygen partial pressure in the upper airway was first quantitatively evaluated as a control objective for a rotary blood pump. A model-free predictive controller was designed based on this control objective. Then, the quantitative evaluation of the controller was implemented with a rotary blood pump model on a complete cardiovascular model incorporated with airway mechanics and gas exchange models...
February 2019: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://read.qxmd.com/read/30758439/evaluation-of-vestibular-and-oculomotor-functions-in-individuals-with-dizziness-after-stroke
#3
Bianca Nunes Pimentel, Valdete Alves Valentins Dos Santos Filha
OBJECTIVE: Changes in postural balance and visual complaints are frequent consequences of stroke. We aimed to investigate the symptoms and the vestibular and oculomotor functions of patients with dizziness post ischemic and hemorrhagic stroke and compare the results among them. METHODS: Fifty patients with dizziness after stroke were evaluated through a clinical anamnesis and computerized vector electronystagmography: calibration of ocular movements, spontaneous nystagmus, semi-spontaneous nystagmus, pendular tracking, optokinetic nystagmus, rotary chair testing, and the caloric test...
January 2019: Arquivos de Neuro-psiquiatria
https://read.qxmd.com/read/30758408/ultrasonic-tips-as-an-auxiliary-method-for-the-instrumentation-of-oval-shaped-root-canals
#4
Melissa Esther Rivera-Peña, Marco Antônio Húngaro Duarte, Murilo Priori Alcalde, Renan Diego Furlan, Marcus Vinicius Reis Só, Rodrigo Ricci Vivan
To evaluate the influence of novel ultrasonic tips as an auxiliary method for the rotary preparation of flattened/oval-shaped canals. Forty-five mandibular incisors were selected and divided into one of three experimental groups (n = 15): Group PFCP - ProDesign Logic 25/.05 + Flatsonic + Clearsonic + Prodesign Logic 40/.01; Group FCP - Flatsonic + Clearsonic + ProDesign Logic 40/.01; and Group PP - Prodesign Logic 25/.05 + Prodesign Logic 40/.05. The teeth were scanned preoperatively and postoperatively using microcomputed tomography...
February 11, 2019: Brazilian Oral Research
https://read.qxmd.com/read/30754612/the-penetration-ability-of-calcium-silicate-root-canal-sealers-into-dentinal-tubules-compared-to-conventional-resin-based-sealer-a-confocal-laser-scanning-microscopy-study
#5
Yemi Kim, Ban-Suk Kim, Yong-Min Kim, Donghee Lee, Sin-Young Kim
The purpose of this study was to compare the penetration ability of calcium silicate root canal sealers and conventional resin-based sealer using confocal laser scanning microscopy (CLSM). A total of 60 recently extracted single-rooted human premolars were used in this study. The root canals were prepared to a size 40/0.06 taper with ProFile rotary instruments and irrigated with NaOCl and EDTA. After drying all canals, the specimens were randomly divided into three experimental groups ( n = 20): Group 1, gutta-percha (GP)/AH Plus with continuous wave compaction; group 2, GP/BioRoot RCS with a single-cone technique; and group 3, GP/Endoseal MTA with a single-cone technique...
February 11, 2019: Materials
https://read.qxmd.com/read/30744194/the-optimal-design-of-modulation-angular-rate-for-mems-based-rotary-semi-sins
#6
Jiayu Zhang, Jie Li, Xiaorui Che, Xi Zhang, Chenjun Hu, Kaiqiang Feng, Tingjin Xu
In previous studies, the semi-strapdown inertial navigation system (SSINS), based on microelectromechanical system (MEMS) sensors, had realized cross-range measurement of attitude information of high-spinning projectiles through construction of a "spin reduction" platform of the roll axis. However, further improvement of its measurement accuracy has been difficult, due to the inertial sensor error. In order to enhance the navigational accuracy, a periodically rotating method is utilized to compensate for sensor error, which is called rotation modulation...
February 10, 2019: Micromachines
https://read.qxmd.com/read/30742983/powder-die-filling-under-gravity-and-suction-fill-mechanisms
#7
R Baserinia, I C Sinka
In pharmaceutical tablet manufacturing, the powder formulation is filled into a die and compacted into a tablet using rigid punches. Die fill is important because it limits the productivity of tablet presses and determines key quality attributes of tablets including weight and content uniformity. Die fill occurs due to gravity and suction fill mechanisms. A model linear shoe-die filling system has been instrumented with pressure measurement devices for detailed characterisation of air pressure evolution as the powder mass is delivered in the die...
February 8, 2019: International Journal of Pharmaceutics
https://read.qxmd.com/read/30737995/in-vivo-evaluation-of-tooth-color-alterations-during-orthodontic-retention-a-split-mouth-cohort-study
#8
A Karamouzos, A A Zafeiriadis, G Kolokithas, M A Papadopoulos, A E Athanasiou
OBJECTIVES: To assess in vivo color alterations of teeth following removal of fixed orthodontic appliances during retention. SETTING AND SAMPLE POPULATION: The Department of Orthodontics at XXXXXX University of XXXXX. Forty eight patients after orthodontic treatment. MATERIAL AND METHODS: Debonding and cleaning procedures after orthodontic treatment were performed using two different carbide burs attached to a low or high-speed handpiece, respectively, in a non-blinded cohort study with split-mouth design...
February 9, 2019: Orthodontics & Craniofacial Research
https://read.qxmd.com/read/30735190/introduction-of-intracapsular-rotary-cut-procedures-ircp-a-modified-hysteromyomectomy-procedures-facilitating-fertility-preservation
#9
Liping Zeng, Weixia Wei, Huiru Tang, Fang He, Shilin Zhong, Wei Zhang, Yuting Xiang, Xinfeng Qu, Ruifang Wu
Uterine fibroids are common benign tumors in the female reproductive system. A hysterectomy is the most effective treatment for symptomatic fibroids. For patients desiring pregnancy, laparoscopic intracapsular myomectomy (LM) is an alternative surgery option. Although LM is widely accepted to treat fibroids, it is technically demanding with risk of excessive bleeding and difficult suturing, especially in cases with large fibroids or tumors in unusual locations. Therefore, we developed an intracapsular rotary-cut procedure (IRCP) as a modification of laparoscopic intracapsular myomectomy, with the intention to minimize risks of LM and help uterine healing...
January 17, 2019: Journal of Visualized Experiments: JoVE
https://read.qxmd.com/read/30733735/purification-and-characterization-of-alkaline-soda-bleach-stable-protease-from-bacillus-sp-app-07-isolated-from-laundromat-soil
#10
I K Shaikh, P P Dixit, T M Shaikh
The detergent-compatible alkaline protease was produced from the bacterial strain Bacillus sp. APP-07 isolated from Laundromat soil of Solapur, Maharashtra, India. The culture was grown in 1000 ml capacity baffled flask with a working volume of 100 ml and incubated at 55 °C for 33 h on a rotary shaker. After incubation, alkaline protease was partially purified by the sequential method of acetone precipitation followed by nominal molecular weight limit (NMWL) cut-off ultrafiltration using 50 K and 10 K filters...
December 2018: Journal, Genetic Engineering & Biotechnology
https://read.qxmd.com/read/30733444/cryo-em-structure-of-the-homohexameric-t3ss-atpase-central-stalk-complex-reveals-rotary-atpase-like-asymmetry
#11
Dorothy D Majewski, Liam J Worrall, Chuan Hong, Claire E Atkinson, Marija Vuckovic, Nobuhiko Watanabe, Zhiheng Yu, Natalie C J Strynadka
Many Gram-negative bacteria, including causative agents of dysentery, plague, and typhoid fever, rely on a type III secretion system - a multi-membrane spanning syringe-like apparatus - for their pathogenicity. The cytosolic ATPase complex of this injectisome is proposed to play an important role in energizing secretion events and substrate recognition. We present the 3.3 Å resolution cryo-EM structure of the enteropathogenic Escherichia coli ATPase EscN in complex with its central stalk EscO. The structure shows an asymmetric pore with different functional states captured in its six catalytic sites, details directly supporting a rotary catalytic mechanism analogous to that of the heterohexameric F1 /V1 -ATPases despite its homohexameric nature...
February 7, 2019: Nature Communications
https://read.qxmd.com/read/30724111/comparison-of-two-paddle-wheel-geometries-within-the-filling-chamber-of-a-rotary-tablet-press-feed-frame-with-regard-to-the-distribution-behavior-of-a-model-powder-and-the-influence-on-the-resulting-tablet-mass
#12
K P Dühlmeyer, H Özcoban, C S Leopold
OBJECTIVE: The purpose of this study was to compare the influence of two different paddle wheel geometries on the distribution behavior of a model powder within the filling chamber of the modified feed frame of a rotary tablet press. Moreover, both paddle wheels were compared regarding their influence on the resulting tablet mass during the tableting process. SIGNIFICANCE: Insights are provided regarding the influence of the paddle wheel geometry on the powder distribution to optimize the die filling process...
February 6, 2019: Drug Development and Industrial Pharmacy
https://read.qxmd.com/read/30721021/direct-current-rotary-tubular-triboelectric-nanogenerator-based-on-liquid-dielectrics-contact-for-sustainably-energy-harvesting-and-chemical-composition-analysis
#13
Jiyu Wang, Zhiyi Wu, Lun Pan, Ruijie Gao, Binbin Zhang, Lijun Yang, Hengyu Guo, Ruijin Liao, Zhong Lin Wang
Ambient mechanical energy harvesting technology introduces a promising solution to alleviate expanding energy demands on a sustainable basis, of which the drawbacks should be drawn attention for further advances. In this work, a liquid-dielectrics interface based triboelectric nanogenerator (TENG) with direct-current output is reported as an energy harvester and a chemical sensor, with advantages of feasible fabrication, anti-wearing durability, and low energy consumption. The TENG consists of FEP tube and Cu electrodes is designed into ring structure, with two electric brushes bilaterally anchored that converts an AC output into direct-current output...
February 5, 2019: ACS Nano
https://read.qxmd.com/read/30715732/micro-ct-evaluation-of-the-removal-of-root-fillings-using-the-protaper-universal-retreatment-system-supplemented-by-the-xp-endo-finisher-file
#14
H Aksel, S Küçükkaya Eren, S Askerbeyli Örs, A Serper, M Ocak, H H Çelik
AIM: To compare the removal of root fillings using the ProTaper Universal Retreatment system (PTUR) followed by a supplementary preparation with the XP-Endo Finisher file. METHODOLOGY: The mesiobuccal root canals of 30 mandibular first molars were instrumented with ProTaper Universal NiTi files up to F2 and filled with one of the following sealers using a single-cone technique (n=10); AH Plus, NeoMTA Plus and Endosequence BC. The root fillings were removed using the PTUR system with additional apical preparation using ProTaper F2 and F3 files...
February 4, 2019: International Endodontic Journal
https://read.qxmd.com/read/30713174/evaluation-of-intracanal-calcium-hydroxide-removal-with-different-techniques-a-scanning-electron-microscope-study
#15
Pratik Agrawal, Gaurav Garg, Shashit S Bavabeedu, Suraj Arora, Shabna Moyin, Sameer Punathil
AIM: This study aimed to evaluate the efficacy of Intracanal calcium hydroxide removal with different techniques. MATERIALS AND METHODS: Seventy-five freshly extracted, non-carious, single canalled lower first premolars, having anatomic characteristics similar to each other, extracted for the orthodontic purpose were collected. After the root canal preparation, Calcium hydroxide was placed into the working length using lentulo spiral instrument till the medicament was visible at the apex...
December 1, 2018: Journal of Contemporary Dental Practice
https://read.qxmd.com/read/30712410/the-influence-of-kinematics-of-engine-driven-nickel-titanium-instruments-on-root-canal-shape-assessed-by-micro-computed-tomography-a-systematic-review
#16
Sandro Junio de Oliveira Tavares, Estéfano Borgo Sarmento, Ludmila da Silva Guimarães, Lívia Azeredo Alves Antunes, Leonardo Santos Antunes, Cinthya Cristina Gomes
AIM: To evaluate if the kinematics of engine-driven instruments affect the root canal shape. METHOD: The systematic review was registered in PROSPERO (CRD 42017077043). A broad search was performed for articles published before 26 September 2018 in the electronic databases: pubmed, scopus, web of science and Lilacs using MeSH and free terms. Only in vitro studies with human teeth that evaluated root canal shape by volume, surface area and unprepared surface area using reciprocating and rotary system assessed by micro-computed tomography were included...
February 4, 2019: Acta Odontologica Scandinavica
https://read.qxmd.com/read/30711178/mechanical-properties-of-various-glide-path-preparation-nickel-titanium-rotary-instruments
#17
Joo-Yeong Lee, Sang Won Kwak, Jung-Hong Ha, Ibrahim H Abu-Tahun, Hyeon-Cheol Kim
INTRODUCTION: The aim of this study was to compare the cyclic fatigue, torsional resistance, and bending stiffness of single-file glide path preparation nickel-titanium instruments. METHODS: ProGlider (#16/progressive taper; Dentsply Sirona, Ballaigues, Switzerland), One G (#14/.03; Micro-Mega, Besancon, France), and EdgeGlidePath (#16/progressive taper; Edge Endo, Albuquerque, NM) were tested. For the bending stiffness test, the instrument was bent to a 45° angle along the main axis while 3 mm of the tip was secured...
February 2019: Journal of Endodontics
https://read.qxmd.com/read/30711082/investigation-of-stethoscope-technology-for-en-route-care
#18
Melissa A Wilson, Brittany L Fouts, Charles J Harding
Occupational challenges in air transport domains make auscultation with traditional stethoscopes difficult. This study aimed to investigate two commercial off-the-shelf stethoscopes for use in high noise military patient transport environments. The stethoscopes were assessed by Aeromedical Evacuation providers in a simulated C-130 trainer on live standardized mock patients. Device 1 was a dual-mode stethoscope developed for rotary wing military airframes. Device 2 was an electronic stethoscope developed for high noise civilian environments...
January 2019: Air Medical Journal
https://read.qxmd.com/read/30704145/structural-asymmetry-and-kinetic-limping-of-single-rotary-f-atp-synthases
#19
REVIEW
Hendrik Sielaff, Seiga Yanagisawa, Wayne D Frasch, Wolfgang Junge, Michael Börsch
F-ATP synthases use proton flow through the FO domain to synthesize ATP in the F₁ domain. In Escherichia coli , the enzyme consists of rotor subunits γε c 10 and stator subunits (αβ)₃δ ab ₂. Subunits c 10 or (αβ)₃ alone are rotationally symmetric. However, symmetry is broken by the b ₂ homodimer, which together with subunit δ a , forms a single eccentric stalk connecting the membrane embedded FO domain with the soluble F₁ domain, and the central rotating and curved stalk composed of subunit γε...
January 30, 2019: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://read.qxmd.com/read/30702405/bonding-performance-of-simplified-adhesive-systems-in-noncarious-cervical-lesions-at-2-year-follow-up-a-double-blind-randomized-clinical-trial
#20
R F Zanatta, T M Silva, Malr Esper, E Bresciani, Sep Gonçalves, Tmf Caneppele
OBJECTIVES: This study aimed to evaluate the bonding performance of a universal adhesive used according to self-etching or etch-and-rinse protocols in noncarious cervical lesions (NCCLs) and to compare the two protocols with their respective gold standard techniques. METHODS AND MATERIALS: This randomized, double-blind clinical study enrolled 34 participants who met the inclusion criteria, 29 of whom returned after two years. They received 152 restorations bonded with one of the three adhesives (Scotchbond Universal Adhesive, Adper Single Bond 2, or Clearfil SE Bond) and one of the two bonding techniques tested...
January 31, 2019: Operative Dentistry
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