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https://www.readbyqxmd.com/read/28548148/diverse-configurations-of-columnar-liquid-crystals-in-cylindrical-nano-and-micropores
#1
Rui-Bin Zhang, Goran Ungar, Xiangbing Zeng, Zhihao Shen
Using 2D X-ray diffraction and AFM we studied the configuration, in cylindrical confinement, of hexagonal columnar phases that anchor homeotropically, i.e. with the columns normal to the pore wall. A wide range of pore diameters, from 20 nm to 100 μm, were explored by employing anodic alumina membranes and glass capillaries. The compounds used were a small discotic, hexakis(hexyloxy)triphenylene (HAT6), a large discotic hexa-peri-hexabenzocoronene (HBC), and a T-shaped bolaamphiphile, forming a honeycomb-type columnar phase...
May 26, 2017: Soft Matter
https://www.readbyqxmd.com/read/28547587/new-quantitative-radiographic-parameters-for-vertical-and-horizontal-instability-in-acromioclavicular-joint-dislocations
#2
Matthias A Zumstein, Philippe Schiessl, Benedikt Ambuehl, Lilianna Bolliger, Johannes Weihs, Martin H Maurer, Beat K Moor, Michael Schaer, Sumit Raniga
PURPOSE: The aim of this study was to identify the most accurate and reliable quantitative radiographic parameters for assessing vertical and horizontal instability in different Rockwood grades of acromioclavicular joint (ACJ) separations. Furthermore, the effect of projectional variation on these parameters was investigated in obtaining lateral Alexander view radiographs. METHODS: A Sawbone model of a scapula with clavicle was mounted on a holding device, and acromioclavicular dislocations as per the Rockwood classification system were simulated with the addition of horizontal posterior displacement...
May 25, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28545983/feedback-from-higher-to-lower-visual-areas-for-visual-recognition-may-be-weaker-in-the-periphery-glimpses-from-the-perception-of-brief-dichoptic-stimuli
#3
Li Zhaoping
Eye movements bring attended visual inputs to the center of vision for further processing. Thus, central and peripheral vision should have different functional roles. Here, we use observations of visual perception under dichoptic stimuli to infer that there is a difference in the top-down feedback from higher brain centers to primary visual cortex. Visual stimuli to the two eyes were designed such that the sum and difference of the binocular input from the two eyes have the form of two different gratings. These gratings differed in their motion direction, tilt direction, or color, and duly evoked ambiguous percepts for the corresponding feature...
May 22, 2017: Vision Research
https://www.readbyqxmd.com/read/28545560/influences-of-lumbar-disc-herniation-on-the-kinematics-in-multi-segmental-spine-pelvis-and-lower-extremities-during-five-activities-of-daily-living
#4
Shengzheng Kuai, Wenyu Zhou, Zhenhua Liao, Run Ji, Daiqi Guo, Rui Zhang, Weiqiang Liu
BACKGROUND: Low back pain (LBP) is a common problem that can contribute to motor dysfunction. Previous studies reporting the changes in kinematic characteristics caused by LBP present conflicting results. This study aimed to apply the multisegmental spinal model to investigate the kinematic changes in patients with lumbar disc herniation (LDH) during five activities of daily living (ADLs). METHODS: Twenty-six healthy subjects and 7 LDH patients participated in this study and performed level walking, stair climbing, trunk flexion, and ipsilateral and contralateral pickups...
May 25, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28544238/the-important-role-of-positioning-in-nasogastric-tube-insertion-in-unconscious-patients-a-prospective-randomized-double-blind-study
#5
Wangmiao Zhao, Chunyan Ge, Wanzeng Zhang, Zhaosheng Sun, Xiaowei Li
AIMS AND OBJECTIVES: To investigate whether positioning the body in a lateral decubitus position will facilitate nasogastric tube insertion in unconscious patients. BACKGROUND: Inserting a nasogastric tube into unconscious patients can be challenging because these patients cannot cooperate with the operator. The piriform sinus and arytenoid cartilage are the most commonly reported impaction sites. However, we found that the first impaction site was the backward displaced tongue when inserting a nasogastric tube in unconscious patients who often exhibited glossoptosis...
May 25, 2017: Journal of Clinical Nursing
https://www.readbyqxmd.com/read/28543819/classifying-trunk-strength-impairment-according-to-the-activity-limitation-caused-in-wheelchair-rugby-performance
#6
Viola C Altmann, Brenda E Groen, Anne L Hart, Yves C Vanlandewijck, Noël L W Keijsers
International Federations in Paralympic sport should develop evidence based classification, based on the relative strength of association between impairment and activities that determine sport specific performance. The purpose of the current study was to assess the relationship between trunk strength impairment and three activities that determine performance in Wheelchair Rugby, and to determine whether this relationship supports the concept of "natural classes". Trunk muscle strength and three determinants of performance were assessed in 27 athletes The correlations between lateral trunk muscle strength and the determinant tilting the chair, and between forward trunk muscle strength and the determinants 1 m acceleration and sprint momentum were calculated...
May 24, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28542289/structural-parameters-associated-with-location-of-peaks-of-peripapillary-retinal-nerve-fiber-layer-thickness-in-young-healthy-eyes
#7
Takehiro Yamashita, Ryo Asaoka, Yuya Kii, Hiroto Terasaki, Hiroshi Murata, Taiji Sakamoto
The location of the peaks of the circumpapillary retinal nerve fiber layer (cpRNFL) thickness is affected by several ocular parameters. In this study, we have generated equations that can determine the peaks of the cpRNFL. This study was a prospective, observational, cross sectional study of 118 healthy right eyes. The axial length, optic disc tilt, superiortemporal (ST)- and inferiortemporal (IT)-peaks of the cpRNFL thickness, and angles of the ST and IT retinal arteries (RA) and veins (RV) were determined...
2017: PloS One
https://www.readbyqxmd.com/read/28542103/predictive-accuracy-of-surgimaptm-surgical-planning-for-sagittal-imbalance-a-cohort-study
#8
Francesco Langella, Jorge Hugo Villafañe, Marco Damilano, Riccardo Cecchinato, Matteo Pejrona, Maryem Ismael, Pedro Berjano
STUDY DESIGN: A cohort study. OBJECTIVE: To evaluate the predictive value of surgical planning using Surgimap™ regarding postoperative sagittal alignment. SUMMARY OF BACKGROUND DATA: Surgical planning in sagittal imbalance is recognized as a key step of treatment to ensure results. METHODS: The study involved 40 non-consecutive patients who underwent surgery for sagittal misalignment. Postoperative alignment measured by sagittal vertical axis (SVA) and pelvic tilt (PT) was considered the gold standard...
May 25, 2017: Spine
https://www.readbyqxmd.com/read/28542100/global-spinal-alignment-in-patients-with-cervical-spondylotic-myelopathy
#9
Go Yoshida, Abdulmajeed Alzakri, Vincent Pointillart, Louis Boissiere, Ibrahim Obeid, Yukihiro Matsuyama, Jean Marc Vital, Olivier Gille
STUDY DESIGN: Prospective radiographic analysis of cervical spondylotic myelopathy (CSM) OBJECTIVE.: To clarify the pathophysiology of CSM, and use the characteristic of global spinal alignment for determining the surgical strategy. SUMMARY OF BACKGROUND DATA: Radiographic evaluation of CSM, in general, comprises cervical magnetic resonance imaging (MRI) and regional cervical radiography, which cannot distinguish between cervical hyperlodorsis with spinopelvic compensation and cervical lordorsis with normal global alignment...
May 24, 2017: Spine
https://www.readbyqxmd.com/read/28540521/comparative-study-of-fat-suppression-techniques-for-hip-arthroplasty-mr-imaging
#10
Sébastien Molière, Jean-Philippe Dillenseger, Matthieu Ehlinger, Stéphane Kremer, Guillaume Bierry
OBJECTIVES: The goal of this study was to evaluate different fat-suppressed fluid-sensitive sequences in association with different metal artifacts reduction techniques (MARS) to determine which combination allows better fat suppression around metallic hip implants. METHODS: An experimental study using an MRI fat-water phantom quantitatively evaluated contrast shift induced by metallic hip implant for different fat-suppression techniques and MARS. Then a clinical study with patients addressed to MRI unit for painful hip prosthesis compared these techniques in terms of fat suppression quality and diagnosis confidence...
May 24, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/28539436/nontrivial-berry-phase-in-magnetic-bamnsb2-semimetal
#11
Silu Huang, Jisun Kim, W A Shelton, E W Plummer, Rongying Jin
The subject of topological materials has attracted immense attention in condensed-matter physics because they host new quantum states of matter containing Dirac, Majorana, or Weyl fermions. Although Majorana fermions can only exist on the surface of topological superconductors, Dirac and Weyl fermions can be realized in both 2D and 3D materials. The latter are semimetals with Dirac/Weyl cones either not tilted (type I) or tilted (type II). Although both Dirac and Weyl fermions have massless nature with the nontrivial Berry phase, the formation of Weyl fermions in 3D semimetals require either time-reversal or inversion symmetry breaking to lift degeneracy at Dirac points...
May 24, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28538994/predictive-feature-remapping-before-saccadic-eye-movements
#12
Dongjun He, Ce Mo, Fang Fang
Saccadic eye movements cause rapid and dramatic displacements of the retinal image of the visual world, yet our conscious perception of the world remains stable and continuous. A popular explanation for this remarkable ability of our visual system to compensate for the displacements is the predictive feature remapping theory. The theory proposes that, before saccades, the representation of a visual stimulus can be predictively transferred from neurons that initially encode the stimulus to neurons whose receptive fields will encompass the stimulus location after the saccade...
May 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28538978/the-characteristics-of-deep-optic-nerve-head-morphology-in-myopic-normal-tension-glaucoma
#13
Jong Chul Han, Eun Jung Lee, Si Bum Kim, Changwon Kee
Purpose: To investigate the relationship between axial length (AL) and deep optic nerve head (ONH) structure and to evaluate the characteristics of deep ONH structures in myopic normal tension glaucoma (NTG). Methods: The following parameters were assessed using spectral-domain optical coherence tomography (SD-OCT): externally oblique border tissue (EOBT) length, ONH tilt angle, optic canal (OC) obliqueness, and β-zone peripapillary atrophy (PPA). In addition, the angular location of the maximal value of each parameter and retinal nerve fiber layer (RNFL) defect were measured using infrared and red-free photos...
May 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28538444/changes-in-cervical-alignment-after-multilevel-schwab-grade-ii-thoracolumbar-osteotomies-for-adult-spinal-deformity
#14
George M Ghobrial, Nathan H Lebwohl, Barth A Green, Joseph P Gjolaj
STUDY DESIGN: Retrospective Cohort OBJECTIVE.: To describe changes in cervical alignment(CA) and deformity (CD) after multilevel Schwab Grade II Osteotomies for adult spinal deformity (ASD). SUMMARY OF BACKGROUND DATA: Reciprocal cervical and global changes after ASD surgery have not been previous described in the setting of multilevel osteotomy. METHODS: Patients with long-segment (> 5 levels) fusion and osteotomy for ASD were radiographically evaluated...
May 19, 2017: Spine
https://www.readbyqxmd.com/read/28538289/a-three-dimensional-analysis-of-the-fracture-planes-in-pediatric-lateral-humeral-condyle-fractures-for-image-based-pin-positioning-during-fixation
#15
Do Young Park, Jae Ho Cho, Doo-Hyung Lee, Wan-Sun Choi, Jun Young Bang, Xiang Yun Yin
OBJECTIVE: To determine the 3 dimensional morphology of pediatric lateral condylar physeal fractures using 3-dimensional computed tomography (3D-CT) and to identify optimal pin positions for percutaneous pinning. DESIGN: Prospective case series of consecutively treated patients SETTING:: Tertiary university hospital setting. PATIENTS: Preoperative 3D-CTs in pediatric surgical candidates diagnosed with lateral condylar physeal fractures INTERVENTION:: Closed reduction and percutaneous pinning was performed...
May 17, 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28537495/remotely-guided-breast-sonography-for-long-term-space-missions-a-case-report-and-discussion
#16
Jackelynne P Silva-Martinez, Andreia Sorice Genaro, Hui Annie Wen, Naama Glauber, Thais Russomano
BACKGROUND: Space radiation can cause different types of cancers in crewmembers, especially during long-term space missions. INTRODUCTION: To date, a complete bilateral breast ultrasound has not been performed at the International Space Station (ISS). A breast screening imaging technique could be a useful tool for early identification of breast cancer in astronauts. We hypothesized that breast ultrasound performed by a crewmember while being remotely guided by a specialist from the ground could be an essential tool for medical diagnosis in space...
May 24, 2017: Telemedicine Journal and E-health: the Official Journal of the American Telemedicine Association
https://www.readbyqxmd.com/read/28537464/multi-domain-assessment-of-autonomic-function-in-spinal-cord-injury-using-a-modified-autonomic-reflex-screen
#17
Michael James Berger, Kurt Kimpinski, Katharine Dianne Currie, Hirmand Nouraei, Mahsa Sadeghi, Andrei V Krassioukov
The purpose of this study was to characterize autonomic lesions in participants with spinal cord injury (SCI; n=10) using an autonomic reflex screen, incorporating sudomotor, cardiovagal and sympathetic adrenergic tests, as well as hemodynamic responses to head-up tilt (HUT). Hemodynamic responses were compared to healthy controls (n=20) and previously published normative cutoffs in order better identify autonomic impairments. Sympathetic skin responses (SSRs), heart rate response to deep breathing (HRDB) and heart rate and beat-to-beat blood pressure responses to Valsalva maneuver (VM) and HUT were measured...
May 24, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28537142/perceived-direction-of-gravity-and-the-body-axis-during-static-whole-body-roll-tilt-in-healthy-subjects
#18
Atsushi Tamura, Yoshiro Wada, Takuo Inui, Akihiro Shiotani
OBJECTIVE: We used the subjective visual vertical (SVV) and two different subjective visual body axis (SVBA) methods to quantify roll-tilt perception under gravity, and investigated the characteristics of these methods during static roll-tilt. In addition, we independently developed a compact device to facilitate evaluation of SVBA in different gravitational environments. METHODS: Ten male volunteers participated in this study. We created a roll-tilt environment using a flight simulator in a dark room...
May 24, 2017: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/28536922/head-shaking-tilt-suppression-a-clinical-test-to-discern-central-from-peripheral-causes-of-vertigo
#19
F C Zuma E Maia, Renato Cal, Ricardo D'Albora, Sergio Carmona, Michael C Schubert
Tilt suppression refers to both tilting the head away from an Earth vertical axis and a reduction of an induced horizontal nystagmus. This phenomenon of reducing an induced horizontal nystagmus involves a circuitry of neurons within the vestibular nuclei and the cerebellum (collectively referred to as velocity storage) and signals from the otolith end organs. Lesions involving this circuitry can disrupt tilt suppression of induced horizontal nystagmus. We investigated the clinical value of combining the horizontal head-shaking nystagmus test with tilt suppression in 28 patients with unilateral peripheral vestibular hypofunction and 11 patients with lesions affecting the central nervous system...
May 23, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28534618/microsecond-timescale-proton-rotating-frame-relaxation-under-magic-angle-spinning
#20
Petra Rovó, Rasmus Linser
This paper deals with the theoretical foundation of proton magic-angle-spinning rotating-frame relaxation (R1ρ) and establishes the range of validity and accuracy of the presented approach to describe low-amplitude microsecond timescale motion in the solid state. Beside heteronuclear dipolar and chemical shift anisotropy interactions, a major source of relaxation for protons is the homonuclear dipolar interaction. For this latter relaxation process no general analytical equation has been published until now which would describe the R1ρ relaxation at any spinning-speed, spin-lock field, or tilt-angle...
May 23, 2017: Journal of Physical Chemistry. B
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