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https://www.readbyqxmd.com/read/28532025/new-tetrahedral-zinc-halide-schiff-base-complexes-synthesis-crystal-structure-theoretical-3d-hirshfeld-surface-analyses-antimicrobial-and-thermal-studies
#1
L Taghizadeh, M Montazerozohori, A Masoudiasl, S Joohari, J M White
A new bidentate Schiff base ligand named as N,N'-bis((E)-3-phenylallylidene)butane-1,4-diamine (L) and three its zinc halide complexes were synthesized and characterized by FT-IR, (1)H NMR, (13)C NMR and UV-Vis spectroscopy. The crystal structure of zinc bromide and iodide complexes were characterized using single crystal X-ray diffraction. The two structures are isomorphous, crystallizing in the monoclinic crystal system with space group C2/c with closely similar unit cell dimensions. In these complexes, the Zn(II) ion is in the center of a distorted tetrahedral environment completed by two iminic nitrogen atoms of Schiff base ligand and two halide anions...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28530736/magnetic-field-controlled-graphene-oxide-based-origami-with-enhanced-surface-area-and-mechanical-properties
#2
Ok-Kyung Park, Chandra Sekhar Tiwary, Yang Yang, Sanjit Bhowmick, Soumya Vinod, Qingbo Zhang, Vicki L Colvin, S A Syed Asif, Robert Vajtai, Evgeni S Penev, Boris I Yakobson, Pulickel M Ajayan
One can utilize the folding of paper to build fascinating 3D origami architectures with extraordinary mechanical properties and surface area. Inspired by the same, the morphology of 2D graphene can be tuned by addition of magnetite (Fe3O4) nanoparticles in the presence of a magnetic field. The innovative 3D architecture with enhanced mechanical properties also shows a high surface area (∼2500 m(2) g(-1)) which is utilized for oil absorption. Detailed microscopy and spectroscopy reveal rolling of graphene oxide (GO) sheets due to the magnetic field driven action of magnetite particles, which is further supported by molecular dynamics (MD) simulations...
May 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/28530209/reproducible-3d-printed-head-tanks-for-electrical-impedance-tomography-with-realistic-shape-and-conductivity-distribution
#3
James Avery, Kirill Aristovich, Barney Low, David Holder
OBJECTIVE: Electrical impedance tomography (EIT) has many promising applications in brain injury monitoring. To evaluate both instrumentation and reconstruction algorithms, experiments are first performed in head tanks. Existing methods, whilst accurate, produce a discontinuous conductivity, and are often made by hand, making it hard for other researchers to replicate. APPROACH: We have developed a method for constructing head tanks directly in a 3D printer. Conductivity was controlled through perforations in the skull surface, which allow for saline to pass through...
May 22, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28528295/a-machine-learning-graph-based-approach-for-3d-segmentation-of-bruch-s-membrane-opening-from-glaucomatous-sd-oct-volumes
#4
Mohammad Saleh Miri, Michael D Abràmoff, Young H Kwon, Milan Sonka, Mona K Garvin
Bruch's membrane opening-minimum rim width (BMO-MRW) is a recently proposed structural parameter which estimates the remaining nerve fiber bundles in the retina and is superior to other conventional structural parameters for diagnosing glaucoma. Measuring this structural parameter requires identification of BMO locations within spectral domain-optical coherence tomography (SD-OCT) volumes. While most automated approaches for segmentation of the BMO either segment the 2D projection of BMO points or identify BMO points in individual B-scans, in this work, we propose a machine-learning graph-based approach for true 3D segmentation of BMO from glaucomatous SD-OCT volumes...
May 6, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28527187/quantitative-stereological-analysis-of-the-highly-porous-hydroxyapatite-scaffolds-using-x-ray-cm-and-sem
#5
Justyna Zygmuntowicz, Aneta Zima, Joanna Czechowska, Karol Szlazak, Anna Ślosarczyk, Katarzyna Konopka
BACKGROUND: Material properties of the scaffolds as well as their microstructure are vital in determining in vivo cellular response. Three-dimensional (3D), highly porous scaffolds are used in tissue engineering to provide a suitable microenvironment and to support regeneration of bone. Both pore sizes and their architecture, in particular interconnection density, impact functionality of scaffold during its biomedical applications. OBJECTIVE: In this paper a comparative study of the microstructure of highly porous hydroxyapatite scaffolds produced via gelcasting of foamed slurries and replication of polyurethane sponge were carried out...
2017: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/28525774/development-and-validation-of-a-physical-model-to-investigate-the-biomechanics-of-infant-head-impact
#6
M Jones, D Darwall, G Khalid, R Prabhu, A Kemp, O Arthurs, P Theobald
Head injury in childhood is the single most common cause of death or permanent disability from injury. However, despite its frequency and significance, there is little understanding of the response of a child's head to injurious loading. This is a significant limitation when making early diagnoses, informing clinical and/or forensic management or injury prevention strategies. With respect to impact vulnerability, current understanding is predominantly based on a few post-mortem-human-surrogate (PMHS) experiments...
April 13, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28525494/optimal-entry-point-and-trajectory-for-anterior-c1-lateral-mass-screw
#7
Yong Hu, Wei-Xin Dong, William Ryan Spiker, Zhen-Shan Yuan, Xiao-Yang Sun, Jiao Zhang, Hui Xie, Todd J Albert
STUDY DESIGN: A radiographic analysis of the anatomy of the C1 lateral mass using computed tomography (CT) scans and Mimics software. OBJECTIVE: To define the anatomy of the C1 lateral mass and make recommendations for optimal entry point and trajectory for anterior C1 lateral mass screws. SUMMARY OF BACKGROUND DATA: Although various posterior insertion angles and entry points for screw insertion have been proposed for posterior C1 lateral mass screws, no large series have been performed to assess the ideal entry point and optimal trajectory for anterior C1 lateral mass screw placement...
June 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28514509/the-dimensions-of-the-tarsal-sinus-and-canal-in-different-foot-positions-and-its-clinical-implications
#8
R P Kleipool, L Blankevoort, J M Ruijter, G M M J Kerkhoffs, R J Oostra
INTRODUCTION: This study presents a reference for the dimensions of the tarsal sinus and canal in healthy adults in different foot positions to facilitate understanding of the kinematics of the subtalar joint, the effect of an implant, and other clinical issues. MATERIALS AND METHODS: In a 3D CT stress test on 20 subjects, the right foot was forced into a neutral and eight different extreme foot positions while CT scans were obtained. The bones were segmented in the neutral foot position...
May 17, 2017: Clinical Anatomy
https://www.readbyqxmd.com/read/28514491/3d-image-based-morphometric-analysis-of-the-scapular-neck-length-in-subjects-undergoing-reverse-shoulder-arthroplasty
#9
P Simon, M Diaz, M Cusick, B Santoni, M Frankle
INTRODUCTION: Scapular notching after RSA may, in part, be related to a patient's scapular morphology. The purpose of this study was to develop a novel 3D measurement technique to describe infraglenoid tubercle morphometry. We hypothesize that the parameters describing infraglenoid tubercle would be normally distributed and would correlate with individual's demographics and glenoid morphometry. MATERIALS AND METHODS: A group of 110 subjects treated with RSA were evaluated...
May 17, 2017: Clinical Anatomy
https://www.readbyqxmd.com/read/28513864/the-influence-of-non-rigid-anatomy-and-patient-positioning-on-endoscopy-ct-image-registration-in-the-head-and-neck
#10
W Scott Ingram, Jinzhong Yang, Richard Wendt, Beth M Beadle, Arvind Rao, Xin A Wang, Laurence E Court
PURPOSE: To assess the influence of non-rigid anatomy and differences in patient positioning between CT acquisition and endoscopic examination on endoscopy-CT image registration in the head and neck. METHODS: Radiotherapy planning CTs and 31-35 daily treatment-room CTs were acquired for nineteen patients. Diagnostic CTs were acquired for thirteen of the patients. The surfaces of the airways were segmented on all scans and triangular meshes were created to render virtual endoscopic images with a calibrated pinhole model of an endoscope...
May 17, 2017: Medical Physics
https://www.readbyqxmd.com/read/28512008/3d-printing-and-modelling-of-customized-implants-and-surgical-guides-for-non-human-primates
#11
Xing Chen, Jessy K Possel, Catherine Wacongne, Anne F van Ham, P Christiaan Klink, Pieter R Roelfsema
BACKGROUND: Primate neurobiologists use chronically implanted devices such as pedestals for head stabilization and chambers to gain access to the brain and study its activity. Such implants are skull-mounted, and made from a hard, durable material, such as titanium. NEW METHOD: Here we present a low-cost method of creating customized 3D-printed cranial implants that are tailored to the anatomy of individual animals. We performed pre-surgical computed tomography (CT) and magnetic resonance (MR) scans to generate three-dimensional (3D) models of the skull and brain...
May 13, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28502686/customized-polymethylmethacrylate-cranioplasty-implants-using-3d-printed-polylactic-acid-molds-technical-note-with-2-illustrative-cases
#12
Joe Abdel Hay, Tarek Smayra, Ronald Moussa
OBJECTIVE: Prefabricated customized cranioplasty implants are anatomically more accurate than manually shaped acrylic implants but remain costly. The authors describe a new cost-effective technique of producing customized polymethylmethacrylate (PMMA) cranioplasty implants using prefabricated 3D printed molds. METHODS: The first patient had a left frontal cranial defect following a craniotomy for a glial tumor. A 3D image of his skull was obtained from axial 0.6mm computed tomography (CT) scan images...
May 11, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28502172/direct-dopant-patterning-by-remote-monolayer-doping-enabled-by-monolayer-fragmentation-study
#13
Ori Hazut, Roie Yerushalmi
The development of new doping methods extending beyond the traditional and well-established techniques is desired to match the rapid advances made in semiconductor processing methods and nanostructure synthesis in numerous emerging applications, including the doping of 3D architectures. To address this, monolayer doping (MLD) and monolayer contact doping (MLCD) methods were recently introduced. The monolayer doping methods enable separation of the doping process of nanostructures from the synthesis step, hence it is also termed ex-situ doping...
May 13, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28497536/robotic-guided-waterjet-cutting-technique-for-high-tibial-dome-osteotomy-a-pilot-study
#14
Eduardo M Suero, Ralph Westphal, David Zaremba, Musa Citak, Nael Hawi, Mustafa Citak, Timo Stuebig, Christian Krettek, Emmanouil Liodakis
BACKGROUND: Oscillating saws generate high levels of heat (up to 150°C), which can lead to tissue necrosis, delayed healing and infection. Abrasive waterjet-cutting techniques have been described as a new tool to perform bone cuts, with less heat generation. METHODS: Four lower-limbs of four human alcohol conserved cadavers were tested. Navigation references were attached to the tibia and an intraoperative fluoroscopy-based 3D scan was obtained. A 1.2 mm diameter nozzle was attached to a robotic arm, which was guided to follow a pre-specified path...
May 12, 2017: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
https://www.readbyqxmd.com/read/28494012/fabrication-of-malleable-three-dimensional-printed-customized-bolus-using-three-dimensional-scanner
#15
Jae Won Park, Se An Oh, Ji Woon Yea, Min Kyu Kang
A three-dimensional (3D)-printed customized bolus (3D bolus) can be used for radiotherapy application to irregular surfaces. However, bolus fabrication based on computed tomography (CT) scans is complicated and also delivers unwanted irradiation. Consequently, we fabricated a bolus using a 3D scanner and evaluated its efficacy. The head of an Alderson Rando phantom was scanned with a 3D scanner. The 3D surface data were exported and reconstructed with Geomagic Design X software. A 3D bolus of 5-mm thickness designed to fit onto the nose was printed with the use of rubber-like printing material, and a radiotherapy plan was developed...
2017: PloS One
https://www.readbyqxmd.com/read/28485921/carbon-nanofiber-arrays-grown-on-three-dimensional-carbon-fiber-architecture-substrate-and-enhanced-interface-performance-of-carbon-fiber-and-zirconium-carbide-coating
#16
Liwen Yan, Xinghong Zhang, Ping Hu, Guangdong Zhao, Shun Dong, Dazhao Liu, Boqian Sun, Dongyang Zhang, Jiecai Han
Carbon nanofibers (CNFs) were grown around the carbon fiber architecture through a plasma enhanced chemical vapor deposition method to enhance the interface performance between CF architecture substrate and ZrC preceramic matrix. The synthesized 3D CF hierarchical architectures (CNFs-CF) are coated with zirconium carbide (ZrC) ceramic to enhance their antioxidant property and high temperature resistance. The composition and the crystalline phase structure of the composite were detected with the X-ray photoelectron spectroscopy and X-ray diffraction...
May 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28482440/-study-on-the-appropriate-parameters-of-automatic-full-crown-tooth-preparation-for-dental-tooth-preparation-robot
#17
F S Yuan, Y Wang, Y P Zhang, Y C Sun, D X Wang, P J Lyu
Objective: To further study the most suitable parameters for automatic full crown preparation using oral clinical micro robot. Its purpose is to improve the quality of automated tooth preparing for the system and to lay the foundation for clinical application. Methods: Twenty selected artificial resin teeth were used as sample teeth. The micro robot automatic tooth preparation system was used in dental clinic to control the picosecond laser beam to complete two dimensional cutting on the resin tooth sample according to the motion planning path...
May 9, 2017: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
https://www.readbyqxmd.com/read/28481954/minor-defects-of-the-luminal-integrity-in-arterial-introducer-esheaths-after-transcatheter-aortic-valve-implantation
#18
Michael Buege, Till Koehler, Ralf Heiderhoff, Marc Papenheim, Si Wang, Heinrich Schleiting, Wolfgang H Arnold, Jason R Foerst, Melchior Seyfarth, Klaus Tiroch, Thomas Riedl, Marc Vorpahl
BACKGROUND: Medical devices such as implant delivery systems are commonly used during minimally invasive procedures in the cardiovascular system. These devices often have lubricious polymer coatings to reduce friction between the device and blood vessels but coatings may separate and potentially cause serious injuries to patients. METHODS: Lubricious coated eSheaths for transcatheter heart valve implantation were assessed for luminal integrity at the proximal, medial and distal part...
2017: PloS One
https://www.readbyqxmd.com/read/28474765/assessment-of-statistical-agreement-of-three-techniques-for-the-study-of-cut-marks-3d-digital-microscope-laser-scanning-confocal-microscopy-and-micro-photogrammetry
#19
Miguel Ángel Maté-González, Julia Aramendi, José Yravedra, Ruth Blasco, Jordi Rosell, Diego González-Aguilera, Manuel Domínguez-Rodrigo
In the last few years, the study of cut marks on bone surfaces has become fundamental for the interpretation of prehistoric butchery practices. Due to the difficulties in the correct identification of cut marks, many criteria for their description and classification have been suggested. Different techniques, such as three-dimensional digital microscope (3D DM), laser scanning confocal microscopy (LSCM) and micro-photogrammetry (M-PG) have been recently applied to the study of cut marks. Although the 3D DM and LSCM microscopic techniques are the most commonly used for the 3D identification of cut marks, M-PG has also proved to be very efficient and a low-cost method...
May 5, 2017: Journal of Microscopy
https://www.readbyqxmd.com/read/28474416/the-co3o4-nano-anchors-fixed-ln-mof-thin-film-as-a-highly-efficient-luminescent-sensor-for-nitrofuran-antibiotics
#20
Feng Zhang, Hua Yao, Tianshu Chu, Gaowei Zhang, Yi Wang, Yangyi Yang
Nitrofurans are a group of widely used veterinary antibiotics which have been forbidden due to antibiotics pollution. Development of a rapid and effective method for the detection of nitrofuran antibiotics (NFAs) are very important but challenging. Herein, we designed a chemical sensor based on a lanthanide metal-organic framework (Ln-MOF) thin film of {[Eu2(BCA)3(H2O)(DMF)3]·0.5DMF·H2O}n (Eu-BCA, where BCA is 2,2'-biquinoline-4,4'-dicarboxylate) fabricated on the cost-effective stainless steel wire mesh (SSWM) by Co3O4 nano-anchors fixation method...
May 4, 2017: Chemistry: a European Journal
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