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https://www.readbyqxmd.com/read/29036875/three-novel-accurate-pixel-driven-projection-methods-for-2d-ct-and-3d-epr-imaging
#1
Zhiwei Qiao, Gage Redler, Zhiguo Gui, Yuhua Qian, Boris Epel, Howard Halpern
OBJECTIVES: This work aims to explore more accurate pixel-driven projection methods for iterative image reconstructions in order to reduce high-frequency artifacts in the generated projection image. METHODS: Three new pixel-driven projection methods namely, small-pixel-large-detector (SPLD), linear interpolation based (LIB) and distance anterpolation based (DAB), were proposed and applied to reconstruct images. The performance of these methods was evaluated in both two-dimensional (2D) computed tomography (CT) images via the modified FORBILD phantom and three-dimensional (3D) electron paramagnetic resonance (EPR) images via the 6-spheres phantom...
October 10, 2017: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/29035745/bio-functionalization-of-grade-v-titanium-alloy-with-type-i-human-collagen-for-enhancing-and-promoting-human-periodontal-fibroblast-cell-adhesion-an-in-vitro-study
#2
Jitendra Sharan, Veena Koul, Amit K Dinda, Om P Kharbanda, Shantanu V Lale, Ritu Duggal, Monu Mishra, Govind Gupta, Manoj P Singh
Surface modification of medical grade V titanium alloy (Ti-6Al-4V) with biomolecules is an important and vital step for tailoring it for various biomedical applications. Present study investigates theinfluence of type I human collagen (T1HC) bio-conjugation through a three stage process. Polished grade V titanium alloy discs were functionalizedwith free OH group by means of controlled heat and alkali treatment followed by coating of 3-aminopropyltriethoxy (APTES) silane couplingagent. T1HC were bio-conjugated through 1-ethyl-3-(3-dimethyl aminopropyl) carbodiimide hydrochloride N-hydroxysuccinimide (EDCNHS)coupling reaction...
October 9, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29035432/images-in-cardiovascular-medicine-unusual-disc-dislodgement-of-a-bj%C3%A3-rk-shiley-valve-after-long-term-implantation
#3
Pao Yen Lin, Wei Chuan Tsai, Ju Yi Chen
No abstract text is available yet for this article.
September 18, 2017: Korean Circulation Journal
https://www.readbyqxmd.com/read/29035401/skydiving-and-the-risk-of-cervical-disc-herniation
#4
Ayşe Coşkun Beyan, Yücel Demiral, Banu Dilek, Nur Şafak Alici, Cem Bediz, Arif Çimrin
The skydiving/parachuting sport which has recently gained popularity is also known for its accidents and injuries. However, there are a few studies related to its occupational ergonomic risks and occupational musculoskeletal diseases. It has been reported that the sudden hyperextension of the neck during the parachute opening, so called opening shock results in neck pain. It has been found that the jumpers are subjected to an average deceleration of 3-5 times the earth's gravitational acceleration (3-5 G) during parachute opening shock...
October 13, 2017: International Journal of Occupational Medicine and Environmental Health
https://www.readbyqxmd.com/read/29034912/shape-effect-induced-spiral-superstructures-in-a-self-assembled-achiral-disc-bent-core-amphiphile
#5
Kehua Gu, Tao Wen, Mengying Han, Wei Zhang, Zhenyu Zhang, Yu Zhou, Zhihao Shen, Xinghe Fan, Rong-Ming Ho
Herein, we aim to demonstrate the shape effect of a giant molecule on the self-assembly of supramolecules. A bent-core (BC) molecule was covalently linked to a disc-like hexa-peri-hexabenzocoronene (HBC), giving a disc-bent core amphiphile. As a result, the induced hierarchical chirality driven by the shape effect on the forming columnar phase gives a two-dimensional nano-ribbon with spiral texture from double-stranded supracolumns.
October 16, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29033576/lumbar-spinal-stenosis-attributable-to-tophaceous-gout-case-report-and-review-of-the-literature
#6
Wei Wang, Qingbo Li, Lei Cai, Weijun Liu
OBJECTIVES: Tophaceous gout seldom affects the axial skeleton. Symptoms vary according to the differential localization of urate deposits and the diagnosis is often delayed. Here, we report an unusual case of lumbar spinal stenosis caused by extradural tophaceous deposits. METHODS: We retrospectively reviewed a case of a patient with tophaceous gout of the lumbar spine and reviewed the relevant literature. RESULTS: A 62-year-old man with a 2-year history of lower back pain and a 3-month history of lower limb radiation pain and intermittent claudication was admitted...
2017: Therapeutics and Clinical Risk Management
https://www.readbyqxmd.com/read/29033191/effect-of-the-ultraviolet-light-treatment-and-storage-methods-on-the-biological-activity-of-a-titanium-implant-surface
#7
Sung-Hwan Choi, Won-Seok Jeong, Jung-Yul Cha, Jae-Hoon Lee, Kee-Joon Lee, Hyung-Seog Yu, Eun-Ha Choi, Kwang-Mahn Kim, Chung-Ju Hwang
OBJECTIVE: We evaluated whether the biological activity of the surface of titanium, when stored in an aqueous solution, in low vacuum, and under ambient conditions after ultraviolet light (UV) treatment is comparable to that of the surface immediately after UV treatment for 15min and that after dielectric barrier discharge (DBD) plasma treatment for 15min. METHODS: Grade IV titanium discs with machined surfaces were irradiated with UV and their surface properties were evaluated immediately and after storage for 28days in distilled H2O (dH2O), a vacuum desiccator (31...
October 12, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29032956/evaluation-of-surface-treatments-of-monolithic-zirconia-in-different-sintering-stages
#8
Kamal Ebeid, Sebastian Wille, Tarek Salah, Marwa Wahsh, Maged Zohdy, Matthias Kern
PURPOSE: This study evaluated the effect of surface treatment of zirconia in pre-sintered and post-sintered stages on its surface roughness, phase transformation, and biaxial flexural strength (BFS). METHODS: Zirconia ceramic discs (n=40) having a final dimensions of 12mm diameter and 1.2mm thickness were milled then divided into three main groups according to the type of surface treatment performed (Group 1 (n=16); air-abrasion using Al2O3 particles, Group 2 (n=16); silica coating using Rocatec soft, and Group 3 (n=8); a control group receiving no surface treatment)...
October 9, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29032826/the-effect-of-internal-roughness-and-bonding-on-the-fracture-resistance-and-structural-reliability-of-lithium-disilicate-ceramic
#9
Paul de Kok, Gabriel K R Pereira, Sara Fraga, Niek de Jager, Andressa B Venturini, Cornelis J Kleverlaan
OBJECTIVE: To evaluate the effect of internal roughness and bonding on the load to failure and structural reliability (Weibull analysis) of a lithium disilicate-based glass ceramic under different testing scenarios. METHODS: IPS e.max CAD blocks (Ivoclar Vivadent AG) were shaped into cylinders (N=100), crystalized according to the manufacturer's instructions, and randomly assigned into two surface conditions: (1) polished surface (600-grit SiC polish papers), and (2) a roughened surface (air-abrasion with 50μm Al2O3)...
October 9, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29032381/analysis-of-correlation-between-vertebral-endplate-change-and-lumbar-disc-degeneration
#10
Long Xiao, Chunlin Ni, Jiandong Shi, Zhirong Wang, Suchun Wang, Jianwei Zhang, Aiqing Lu
BACKGROUND To evaluate the correlation between vertebral endplate change and the level of lumbar disc degeneration via magnetic resonance imaging (MRI). MATERIAL AND METHODS A total of 345 patients who were recruited from our hospital from May 2012 to May 2016 were evaluated for the presence of intervertebral disc degeneration or herniation. The degree of degeneration was assessed according to Pfirrmann grade. Vertebral endplate change was evaluated based on the endplate concave angle (ECA), and Modic change on sagittal MRI...
October 15, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29031994/clinical-classification-criteria-for-neurogenic-claudication-caused-by-lumbar-spinal-stenosis-the-n-class-criteria
#11
Stéphane Genevay, Delphine S Courvoisier, Kika Konstantinou, Francisco M Kovacs, Marc Marty, James Rainville, Michael Norberg, Jean-François Kaux, Thomas D Cha, Jeffrey N Katz, Steven J Atlas
BACKGROUND CONTEXT: Since imaging findings of lumbar spinal stenosis (LSS) may not be associated with symptoms, clinical classification criteria based on patient symptoms and physical examination findings are needed. PURPOSE: To develop clinical classification criteria that identify patients with neurogenic claudication (NC) caused by LSS. STUDY DESIGN: Two stage process. Phase 1: Delphi process; Phase 2: cross-sectional study. PATIENT SAMPLE: Outpatients recruited from spine clinics in 5 countries...
October 12, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/29031872/accumulation-and-localization-of-macrophage-phenotypes-with-human-intervertebral-disc-degeneration
#12
Kenneth R Nakazawa, Benjamin A Walter, Damien M Laudier, Divya Krishnamoorthy, Grace E Mosley, Kara L Spiller, James C Iatridis
BACKGROUND CONTEXT: Chronic inflammation is an important component of intervertebral disc (IVD) degeneration, but there is limited knowledge about the identity and source of inflammatory cells involved with the degenerative processes. Macrophages can exhibit multiple phenotypes and are known inflammatory regulators in many tissues, but their phenotypes have not been characterized in IVD degeneration. PURPOSE: To characterize accumulation and localization of macrophages in IVD degeneration...
October 11, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/29030880/direct-saturation-corrected-chemical-exchange-saturation-transfer-mri-of-glioma-simplified-decoupling-of-amide-proton-transfer-and-nuclear-overhauser-effect-contrasts
#13
Iris Yuwen Zhou, Enfeng Wang, Jerry S Cheung, Dongshuang Lu, Yang Ji, Xiaoan Zhang, Giulia Fulci, Phillip Zhe Sun
PURPOSE: Chemical exchange saturation transfer (CEST) MRI has shown promise in tissue characterization in diseases like stroke and tumor. However, in vivo CEST imaging such as amide proton transfer (APT) MRI is challenging because of concomitant factors such as direct water saturation, macromolecular magnetization transfer, and nuclear overhauser effect (NOE), which lead to a complex contrast in the commonly used asymmetry analysis (MTRasym). Here, we propose a direct saturation-corrected CEST (DISC-CEST) analysis for simplified decoupling and quantification of in vivo CEST effects...
October 13, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29030622/sandwich-structured-c-c-sic-composites-fabricated-by-electromagnetic-coupling-chemical-vapor-infiltration
#14
Chenglong Hu, Wenhu Hong, Xiaojing Xu, Sufang Tang, Shanyi Du, Hui-Ming Cheng
Carbon fiber (CF) reinforced carbon-silicon carbide (C/C-SiC) composites are one of the most promising lightweight materials for re-entry thermal protection, rocket nozzles and brake discs applications. In this paper, a novel sandwich-structured C/C-SiC composite, containing two exterior C/SiC layers, two gradient C/C-SiC layers and a C/C core, has been designed and fabricated by two-step electromagnetic-coupling chemical vapor infiltration (E-CVI) for a 20-hour deposition time. The cross-section morphologies, interface microstructures and SiC-matrix growth characteristics and compositions of the composites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD), respectively...
October 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29030610/angiotensin-converting-enzyme-ance-is-cooperatively-regulated-by-mad-and-pannier-in-drosophila-imaginal-discs
#15
Ah-Ram Kim, Eun-Bee Choi, Mi-Young Kim, Kwang-Wook Choi
Angiotensin-converting enzyme (ACE) is an evolutionarily conserved peptidyl dipeptidase. Mammalian ACE converts angiotensin I to the active vasoconstrictor angiotensin II, thus playing a critical role for homeostasis of the renin-angiotensin system. In Drosophila, the ACE homolog Ance is expressed in specific regions of developing organs, but its regulatory mechanism has not been identified. Here we provide evidence that Ance expression is regulated by a combination of Mad and Pannier (Pnr) in imaginal discs...
October 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29030311/potential-transmission-opportunity-of-ctx-m-producing-escherichia-coli-in-large-scale-chicken-farm-in-vietnam
#16
Ngan Bui Thi Kim, Huong Bui Thi Mai, Shuhei Ueda, Tuyen Le Danh, Yoshimasa Yamamoto, Itaru Hirai
OBJECTIVES: Extended spectrum β-lactamase (ESBL)-producing Escherichia coli has been spread out worldwide. We investigated blaCTX-M-positive E. coli in a Vietnamese large-size chicken farm, and evaluated whether there was any different prevalence and molecular characters of blaCTX-M-positive E. coli between the large size chicken farm and a Vietnamese community. METHODS: Fecal samples were collected from 24 human individuals and 38 chickens of a large-scale chicken farm, and from 51 human and 36 chickens of a community...
October 10, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/29030281/disc-repositioning-plus-temporal-eminectomy-for-temporomandibular-joint-internal-derangement-a-pilot-study
#17
René Pedraza-Alarcon, Martín Pinzón-Navarro, Cristián E Bachelet, Perla Villamor
INTRODUCTION: Temporomandibular joint internal derangement is a common disorder, which usually resolves with conservative management. However, 5% of patients require surgery, and although many techniques have been described, a gold standard surgical procedure has not yet been established. OBJECTIVES: The aim of this study was to compare the clinical outcome of disc repositioning plus temporal eminectomy versus disc repositioning alone, for the treatment of temporomandibular joint internal derangement...
October 10, 2017: Journal of Stomatology, Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29029194/envelope-proteome-changes-driven-by-rama-overproduction-in-klebsiella-pneumoniae-that-enhance-acquired-%C3%AE-lactam-resistance
#18
Juan-Carlos Jiménez-Castellanos, Wan Ahmad Kamil Wan Nur Ismah, Yuiko Takebayashi, Jacqueline Findlay, Thamarai Schneiders, Kate J Heesom, Matthew B Avison
Objectives: In Klebsiella pneumoniae, overproduction of RamA results in reduced envelope permeability and reduced antimicrobial susceptibility but clinically relevant resistance is rarely observed. Here we have tested whether RamA overproduction can enhance acquired β-lactam resistance mechanisms in K. pneumoniae and have defined the envelope protein abundance changes upon RamA overproduction during growth in low and high osmolarity media. Methods: Envelope permeability was estimated using a fluorescent dye accumulation assay...
October 6, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29029072/detection-of-optra-in-the-african-continent-tunisia-within-a-mosaic-enterococcus-faecalis-plasmid-from-urban-wastewaters
#19
Ana R Freitas, Houyem Elghaieb, Ricardo León-Sampedro, Mohamed Salah Abbassi, Carla Novais, Teresa M Coque, Abdennaceur Hassen, Luisa Peixe
Objectives: Oxazolidinone resistance is a serious limitation in the treatment of MDR Enterococcus infections. Plasmid-mediated oxazolidinone resistance has been strongly linked to animals where the use of phenicols might co-select resistance to both antibiotic families. Our goal was to assess the diversity of genes conferring phenicol/oxazolidinone resistance among diverse enterococci and to characterize the optrA genetic environment. Methods: Chloramphenicol-resistant isolates (>16 mg/L, n = 245) from different sources (hospitals/healthy humans/wastewaters/animals) in Portugal, Angola and Tunisia (1996-2016) were selected...
September 26, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29028797/stat-wingless-and-nurf-38-determine-the-accuracy-of-regeneration-after-radiation-damage-in-drosophila
#20
Shilpi Verghese, Tin Tin Su
We report here a study of regeneration in Drosophila larval wing imaginal discs after damage by ionizing radiation. We detected faithful regeneration that restored a wing disc and abnormal regeneration that produced an extra wing disc. We describe a sequence of changes in cell number, location and fate that occur to produce an ectopic disc. We identified a group of cells that not only participate in ectopic disc formation but also recruit others to do so. STAT92E (Drosophila STAT3/5) and Nurf-38, which encodes a member of the Nucleosome Remodeling Factor complex, oppose each other in these cells to modulate the frequency of ectopic disc growth...
October 13, 2017: PLoS Genetics
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