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https://www.readbyqxmd.com/read/28640604/parametrizaton-of-a-reactive-force-field-reaxff-for-molecular-dynamics-simulations-of-si-nanoparticles
#1
Giovanni Barcaro, Susanna Monti, Luca Sementa, Vincenzo Carravetta
A novel computational approach, based on classical reactive molecular dynamics simulations (RMD) and quantum chemistry (QC) global energy optimizations, is proposed for modelling large Si nanoparticles. The force field parameters, which can describe bond breaking and formation, are derived by reproducing energetic and structural properties of a set of Si clusters increasing in size. These reference models are obtained through a new protocol based on a joint high temperature RMD/low temperature Basin Hopping QC search...
June 22, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28633151/age-based-normative-measurements-of-the-pediatric-pelvis
#2
Matthew E Oetgen, Steven Andelman, Benjamin D Martin
OBJECTIVES: Pediatric pelvic trauma is associated with high rates of morbidity and mortality. Current classifications do not take into account age-dependent quantitative differences of the pediatric pelvis making accurate diagnosis of pathologic diastasis of the pubic symphysis, sacroiliac (SI) joints, and triradiate cartilage difficult. The purpose of this study was to establish age-based normative values for the width of the pubic symphysis, SI joints, and the triradiate cartilage of the pediatric pelvis...
July 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28627714/migraine-subclassification-via-a-data-driven-automated-approach-using-multimodality-factor-mixture-modeling-of-brain-structure-measurements
#3
Todd J Schwedt, Bing Si, Jing Li, Teresa Wu, Catherine D Chong
BACKGROUND: The current subclassification of migraine is according to headache frequency and aura status. The variability in migraine symptoms, disease course, and response to treatment suggest the presence of additional heterogeneity or subclasses within migraine. OBJECTIVE: The study objective was to subclassify migraine via a data-driven approach, identifying latent factors by jointly exploiting multiple sets of brain structural features obtained via magnetic resonance imaging (MRI)...
June 19, 2017: Headache
https://www.readbyqxmd.com/read/28600005/sacroiliac-fusion-another-magic-bullet-destined-for-disrepute
#4
REVIEW
Robert W Bina, R John Hurlbert
Pain related to joint dysfunction can be treated with joint fusion; this is a long-standing principle of musculoskeletal surgery. However, pain arising from the sacroiliac (SI) joint is difficult to diagnose. Several implant devices are available that promote fusion by simply crossing the joint space. Evidence establishing outcomes is misleading because of vague diagnostic criteria, flawed methodology, bias, and limited follow-up. Because of nonstandardized indications and historically inferior reconstruction techniques, SI joint fusion should be considered unproven...
July 2017: Neurosurgery Clinics of North America
https://www.readbyqxmd.com/read/28578846/the-congruence-and-joint-space-width-of-the-lateral-compartment-can-be-restored-after-medial-unicompartmental-knee-arthroplasty
#5
Fei Cao, Haibo Si, Yi Zeng, Canfeng Li, Yuangang Wu, Bin Shen
BACKGROUND: Progressive degenerative changes in the lateral compartment of the knee after medial unicompartmental arthroplasty (UKA) remain a main cause of revision surgery. The purpose of this study is to evaluate whether tibiofemoral congruence and joint space width (JSW) of the lateral compartment are improved after medial UKA using traditional instruments. METHODS: We retrospectively analyzed the preoperative and postoperative lateral tibiofemoral congruence using validated software that evaluates the geometric relationship between surfaces and calculates a congruence index (CI)...
April 27, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28571870/numerical-simulation-study-on-air-quality-in-aircraft-cabins
#6
Yingjie Zhao, Bingrong Dai, Qi Yu, Haiqing Si, Gang Yu
Air pollution is one of the main factors that affect the air quality in aircraft cabins, and the use of different air supply modes could influence the distribution of air pollutants in cabins. Based on the traditional ceiling air supply mode used on the B737NG, this study investigated another 3 different kinds of air supply modes for comparison: luggage rack air supply mode, joint mode combining ceiling and luggage rack air supply, and joint mode combining ceiling and individual air supply. Under the above 4 air supply modes, the air velocity, temperature and distribution of air pollutants in a cabin full of passengers were studied using computational fluid dynamics (CFD), and carbon dioxide (CO2) and formaldehyde were selected as 2 kinds of representative air pollutants...
June 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28544894/regulation-of-maize-kernel-weight-and-carbohydrate-metabolism-by-abscisic-acid-applied-at-the-early-and-middle-post-pollination-stages-in-vitro
#7
Li Zhang, Xu-Hui Li, Zhen Gao, Si Shen, Xiao-Gui Liang, Xue Zhao, Shan Lin, Shun-Li Zhou
Abscisic acid (ABA) accumulates in plants under drought stress, but views on the role of ABA in kernel formation and abortion are not unified. The response of the developing maize kernel to exogenous ABA was investigated by excising kernels from cob sections at four days after pollination and culturing in vitro with different concentrations of ABA (0, 5, 10, 100μM). When ABA was applied at the early post-pollination stage (EPPS), significant weight loss was observed at high ABA concentration (100μM), which could be attributed to jointly affected sink capacity and activity...
May 10, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28529517/role-of-silicon-on-plant-pathogen-interactions
#8
REVIEW
Min Wang, Limin Gao, Suyue Dong, Yuming Sun, Qirong Shen, Shiwei Guo
Although silicon (Si) is not recognized as an essential element for general higher plants, it has beneficial effects on the growth and production of a wide range of plant species. Si is known to effectively mitigate various environmental stresses and enhance plant resistance against both fungal and bacterial pathogens. In this review, the effects of Si on plant-pathogen interactions are analyzed, mainly on physical, biochemical, and molecular aspects. In most cases, the Si-induced biochemical/molecular resistance during plant-pathogen interactions were dominated as joint resistance, involving activating defense-related enzymes activates, stimulating antimicrobial compound production, regulating the complex network of signal pathways, and activating of the expression of defense-related genes...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28482137/effects-of-long-term-etanercept-treatment-on-clinical-outcomes-and-objective-signs-of-inflammation-in-early-non-radiographic-axial-spondyloarthritis-104-week-results-from-the-embark-study
#9
Maxime Dougados, Désirée van der Heijde, Joachim Sieper, Jürgen Braun, Gustavo Citera, Jan Lenaerts, Filip van den Bosch, James Cheng-Chung Wei, Ron Pedersen, Randi Bonin, Heather Jones, Lisa Marshall, Isabelle Logeart, Bonnie Vlahos, Jack F Bukowski, Walter P Maksymowych
OBJECTIVE: To evaluate the long-term clinical and imaging efficacy of etanercept in patients with early, active non-radiographic axial spondyloarthritis (nr-axSpA). METHODS: Adult patients who satisfied Assessment of SpondyloArthritis international Society (ASAS) classification criteria for axSpA, but not modified New York radiographic criteria, with symptom duration >3 months to <5 years, and who were unresponsive to ≥2 NSAIDs, received double-blind etanercept 50 mg/week or placebo for 12 weeks, followed by open-label etanercept 50 mg/week to week 104...
May 8, 2017: Arthritis Care & Research
https://www.readbyqxmd.com/read/28454239/downregulation-of-tumor-protein-53-inducible-nuclear-protein-1-expression-in-hepatocellular-carcinoma-correlates-with-poor-prognosis
#10
Yan Deng, Ai-Min Li, Xin-Mei Zhao, Zhang-Juan Song, Si-De Liu
The expression of tumor protein 53-inducible nuclear protein 1 (TP53INP1) is upregulated in certain cancers and downregulated in others. However, its expression in hepatocellular carcinoma (HCC) is not clear. The present study aimed to investigate the expression and prognostic value of TP53INP1 and its association with clinicopathological parameters in HCC. TP53INP1 expression in HCC tissue samples was examined via immunohistochemistry, western blotting and reverse transcription-quantitative polymerase chain reaction...
March 2017: Oncology Letters
https://www.readbyqxmd.com/read/28437347/effect-of-coronal-scoliotic-curvature-on-sagittal-spinal-shape-analysis-of-parameters-in-mature-adolescent-scoliosis-patients
#11
Jae-Young Hong, Keon-Woo Kim, Seung-Woo Suh, Si-Young Park, Jae-Hyuk Yang
STUDY DESIGN: A radiographic analysis with scoliosis patients. OBJECTIVES: To analyze correlations between sagittal spinal alignment and coronal scoliotic curvature. SUMMARY OF BACKGROUND DATA: Sagittal spinal alignment and scoliosis may have a significant relationship, and schematic analysis is needed. METHODS: The study group was comprised of 163 patients with adolescent idiopathic scoliosis. Subjects underwent anteroposterior and lateral radiographs of the whole spine including hip joints...
May 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28428726/successful-treatment-of-prosthetic-joint-infection-due-to-vancomycin-resistant-enterococci-with-tedizolid
#12
Sheng Si, Michael J Durkin, Maureen M Mercier, Melanie L Yarbrough, Stephen Y Liang
Few antibiotic options exist for the management of infections due to vancomycin-resistant enterococci (VRE). We describe a case involving the safe and successful use of tedizolid, a new oxazolidinone, to treat VRE prosthetic joint infection.
March 2017: Infectious Diseases in Clinical Practice: IDCP
https://www.readbyqxmd.com/read/28419029/females-with-unexplained-joint-pain-following-total-joint-arthroplasty-exhibit-a-higher-rate-and-severity-of-hypersensitivity-to-implant-metals-compared-with-males-implications-of-sex-based-bioreactivity-differences
#13
Marco S Caicedo, Edward Solver, Latasha Coleman, Joshua J Jacobs, Nadim J Hallab
BACKGROUND: Recent studies indicate that females demonstrate an increased risk of experiencing adverse local tissue reactions, aseptic loosening, and revision after primary metal-on-metal hip resurfacing arthroplasty compared with males; the underlying biological mechanisms responsible for sex discrepancies in implant failure remain unclear. In addition to anatomical and biomechanical sex differences, there may be inherent immunological disparities that predispose females to more aggressive adaptive immune reactivity to implant debris, i...
April 19, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28399875/asas-definition-for-sacroiliitis-on-mri-in-spa-applicable-to-children
#14
Nele Herregods, Joke Dehoorne, Filip Van den Bosch, Jacob Lester Jaremko, Joke Van Vlaenderen, Rik Joos, Xenofon Baraliakos, Gaëlle Varkas, Koenraad Verstraete, Dirk Elewaut, Lennart Jans
BACKGROUND: The Assessment of Spondyloarthritis International Society (ASAS) definition for a 'positive' Magnetic Resonance Imaging (MRI) for sacroiliitis is well studied and validated in adults, but studies about the value of this definition in children are lacking. The aim of this study is to evaluate whether the adult ASAS definition of a positive MRI of the sacroiliac joints can be applied to children with a clinical suspicion of Juvenile Spondyloarthritis (JSpA). METHODS: Two pediatric musculoskeletal radiologists blinded to clinical data independently retrospectively reviewed sacroiliac (SI) joint MRI in 109 children suspected of sacroiliitis...
April 11, 2017: Pediatric Rheumatology Online Journal
https://www.readbyqxmd.com/read/28399606/-diagnosis-of-patients-with-painful-sacroiliac-joint-syndrome
#15
Rahel Bornemann, Robert Pflugmacher, Ernst M W Koch, Philip Peter Roessler, Yorck Rommelspacher, Dieter Christian Wirtz, Sönke Percy Frey
Pain coming from the sacroiliac (SI) joints can explain up to 25 % of all chronic low back pain. A careful differential diagnosis is required to avoid misdiagnosis of low back pain. In addition to historical findings, positive findings on physical examination maneuvers that stress the SI joint are a key component diagnosis. The SI joint is confirmed as a pain generator when intraarticular injection of local anaesthetics provides acute back pain relief. Minimally invasive SI joint fusion is clearly superior to invasive open surgical procedures, with decreased blood loss and tissue disruption, shorter procedure times and shorter hospital stays...
April 11, 2017: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/28391395/biomechanical-analysis-of-anterior-ring-fixation-of-the-ramus-in-type-c-pelvis-fractures
#16
S McLachlin, M Lesieur, D Stephen, H Kreder, C Whyne
PURPOSE: This biomechanical study compared the stability of four different ramus fracture fixation methods for Type C pelvic ring injuries in the absence of posterior fixation. METHODS: A 5-mm vertical osteotomy of the mid-superior and inferior pubic ramus was created in 12 synthetic pelvic models. Four surgical constructs were compared: (1) two-pin AIIS external fixation, (2) 3.5-mm reconstruction plating, (3) bicortical, fully threaded 3.5-mm, and (4) 6.5-mm pubic ramus screws...
April 8, 2017: European Journal of Trauma and Emergency Surgery: Official Publication of the European Trauma Society
https://www.readbyqxmd.com/read/28388969/is-ct-indicated-in-diagnosing-sacroiliac-joint-degeneration
#17
J Bäcklund, E Clewett Dahl, M Skorpil
AIM: To assess the value of computed tomography (CT) in the diagnosis of symptomatic sacroiliac (SI) joint degeneration. MATERIALS AND METHODS: CT images from 123 patients with clinically diagnosed SI joint pain were compared to age- and gender-matched controls without chronic back pain or previous back surgery. Degeneration was graded assessing joint space narrowing, osteophytes, subchondral sclerosis, cysts, and vacuum phenomena. RESULTS: The mean total score for the patients was 9...
April 4, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28386571/the-broken-ring-of-fire-a-new-radiological-sign-as-predictor-of-syndesmosis-injury
#18
James Calder, Adam Mitchell, Adam Lomax, Moez S Ballal, John Grice, Niek van Dijk, Justin Lee
BACKGROUND: Subcircumferential periosteal edema above the ankle joint is frequently present on magnetic resonance imaging (MRI) with syndesmosis injuries but has not been previously reported. Fluid height within the interosseous membrane also has not previously been shown to be associated with syndesmosis injury severity. PURPOSE: To investigate whether a new sign on MRI and measurement of the length of fluid within the interosseous membrane above the ankle may be used to enable identification of a syndesmosis injury and allow differentiation from lateral ligament injury...
March 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28337303/the-involvement-and-possible-mechanism-of-nr4a1-in-chondrocyte-apoptosis-during-osteoarthritis
#19
Xinge Shi, Hui Ye, Xuedong Yao, Yanzheng Gao
Osteoarthritis (OA) is a joint disease caused by the breakdown of joint cartilage and underlying bone, and places great burdens to daily life of patients. Nuclear orphan receptor nuclear receptor subfamily 4, group A, member 1 (NR4A1) is vital for cell apoptosis, but little is known about its role in OA. This study aims to reveal the expression and function of NR4A1 during OA chondrocyte apoptosis. NR4A1 expression by qRT-PCR and western blot, and chondrocyte apoptosis by TUNEL assay were detected in normal and OA joint cartilage...
2017: American Journal of Translational Research
https://www.readbyqxmd.com/read/28328825/prevalence-of-symptomatic-hip-knee-and-spine-osteoarthritis-nationwide-health-survey-analysis-of-an-elderly-korean-population
#20
Jung-Ho Park, Jae-Young Hong, Kyungdo Han, Seung-Woo Suh, Si-Young Park, Jae-Hyuk Yang, Seung-Woo Han
Osteoarthritis is prominent among the elderly, with symptoms originating from multiple parts of the body. A cross-sectional study of a nationwide survey was performed to describe the prevalence of and identify factors related to symptomatic hip, knee, and spine osteoarthritis.This cross-sectional study collected data from the Fifth Korean National Health and Nutrition Examination Survey (KNHANES V-5; 2010-2012). After excluding ineligible subjects, there were 8976 subjects in this study (3830 males and 5146 females)...
March 2017: Medicine (Baltimore)
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