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https://www.readbyqxmd.com/read/28327472/spatiotemporal-treadmill-gait-measurements-using-a-laser-range-scanner-feasibility-study-of-the-healthy-young-adults
#1
S Tanabe, T Ii, S Koyama, E Saitoh, N Itoh, K Ohtsuka, Y Katoh, A Shimizu, Y Tomita
OBJECTIVE: Spatio-temporal parameters are typically used for gait analysis. Although these parameters are measured by sophisticated systems such as 3D motion capture system or optoelectronic bars, these systems cannot be deployed easily because of their high costs, large space requirements and elaborate set-up. The purpose of this study is to develope a system for measuring spatiotemporal gait parameters using a laser range scanner during treadmill gait. APPROACH: To calculate accurate spatiotemporal parameters, the differences between the laser range scanner measured values and the reference values obtained from a 3D motion capture system were investigated in thirty subjects...
March 22, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28327351/parkinson-s-patients-can-rely-on-perspective-cues-to-perceive-3d-space
#2
Alexandra Séverac Cauquil, Fabienne Ory-Magne, Vincent Jardiné, Monique Galitzky, Maxime Rosito, Christine Brefel-Courbon, Simona Celebrini
3D perception, which is necessary for an optimal navigation in our environment, relies on 2 complementary kinds of cues; binocular cues allowing precise depth localization near the point of visual interest and monocular ones that are necessary for correct global perception of visual space. Recent studies described deficient binocular 3D vision in PD patients; here we tested 3D vision in PD patients when based on monocular cues (m3D). Sixteen PD patients and 16 controls had to categorize visual stimuli as perceived in 2D (flat) or 3D (with depth)...
March 18, 2017: Brain Research
https://www.readbyqxmd.com/read/28326629/solvent-controlled-phase-transition-of-a-co-ii-organic-framework-from-achiral-to-chiral-and-two-to-three-dimen-sion
#3
Xing-Po Wang, Wen-Miao Chen, Xiao-Yu Li, Cyril Rajnák, Zhen-Yu Feng, Mohamedally Kurmoo, Roman Boča, Chunjiang Jia, Chen-Ho Tung, Di Sun
We report an unprecedented reversible dynamic transformation in a metal-organic framework involving bond formation that is accompanied by two important structural changes, achiral to chiral and two- to three-dimension. Using two bent organic lig-ands (diimpym = 4,6-di(1H-imidazol-1-yl)pyrimidine; H2npta = 5-nitroisophthalic acid) and CoII(NO3)2*6H2O the coordination pol-ymer Co(diimpym)(npta)*CH3OH, 1*CH3OH, was obtained sol-vothermally. Its structure consisting of knitted pairs of square layers (44-sql) of five-coordinated Co, disordered methanol and crystallizing in achiral Pbca space group at room temperature undergoes a single-crystal to single-crystal (SC-SC) transfor-mation to a 3D interpenetrated framework (pcu) of six-coordinated Co and ordered methanol in chiral P212121 space group below 220 K...
March 21, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28323041/quantitative-analyses-of-the-3d-nuclear-landscape-recorded-with-super-resolved-fluorescence-microscopy
#4
Volker J Schmid, Marion Cremer, Thomas Cremer
Recent advancements of super-resolved fluorescence microscopy have revolutionized microscopic studies of cells, including the exceedingly complex structural organization of cell nuclei in space and time. In this paper we describe and discuss tools for (semi-) automated, quantitative 3D analyses of the spatial nuclear organization. These tools allow the quantitative assessment of highly resolved different chromatin compaction levels in individual cell nuclei, which reflect functionally different regions or sub-compartments of the 3D nuclear landscape, and measurements of absolute distances between sites of different chromatin compaction...
March 18, 2017: Methods: a Companion to Methods in Enzymology
https://www.readbyqxmd.com/read/28322918/favipiravir-can-evoke-lethal-mutagenesis-and-extinction-of-foot-and-mouth-disease-virus
#5
Ana Isabel de Avila, Elena Moreno, Celia Perales, Esteban Domingo
Antiviral agents are increasingly considered an option for veterinary medicine. An understanding of their mechanism of activity is important to plan their administration either as monotherapy or in combination with other agents. Previous studies have shown that the broad spectrum antiviral agent favipiravir (T-705) and its derivatives T-1105 and T-1106 are efficient inhibitors of foot-and-mouth disease virus (FMDV) replication in cell culture and in vivo. However, no mechanism for their activity against FMDV has been proposed...
March 17, 2017: Virus Research
https://www.readbyqxmd.com/read/28321448/acabo3-a-cs-rb-two-new-cubic-borates-with-isolated-bo3-groups
#6
Ming Wen, Hongping Wu, Xin Su, Juanjuan Lu, Zhihua Yang, Xiaohong Wu, Shilie Pan
Two alkali metal and alkaline-earth metal borates, ACaBO3 (A = Cs, Rb), were synthesized by a high temperature solution method. The powder SHG response of CsCaBO3 is approximately one time that of KH2PO4 (KDP), and its experimental band gap is 4.20 eV. The SHG density calculations indicate that the SHG effect originates from the synergistic effect of B-O and Ca-O groups. The two compounds crystallize in the cubic space group P213 and their structures feature a 3D framework composed of the CaO6 octahedra, the CsO9 polyhedra and the BO3 triangles...
March 21, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28320939/decoupling-local-mechanics-from-large-scale-structure-in-modular-metamaterials
#7
Nan Yang, Jesse L Silverberg
A defining feature of mechanical metamaterials is that their properties are determined by the organization of internal structure instead of the raw fabrication materials. This shift of attention to engineering internal degrees of freedom has coaxed relatively simple materials into exhibiting a wide range of remarkable mechanical properties. For practical applications to be realized, however, this nascent understanding of metamaterial design must be translated into a capacity for engineering large-scale structures with prescribed mechanical functionality...
March 20, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28320847/multivoxel-pattern-analysis-reveals-3d-place-information-in-the-human-hippocampus
#8
Misun Kim, Kate J Jeffery, Eleanor A Maguire
The spatial world is three-dimensional (3D), and humans and other animals move both horizontally and vertically within it. Extant neuroscientific studies have typically investigated spatial navigation on a horizontal two-dimensional plane, leaving much unknown about how 3D spatial information is represented in the brain. Specifically, horizontal and vertical information may be encoded in the same or different neural structures with equal or unequal sensitivity. Here, we investigated these possibilities using functional MRI (fMRI) while participants were passively moved within a 3D lattice structure as if riding a rollercoaster...
March 20, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28320677/intermanual-apparent-tactile-motion-and-its-extension-to-3d-interactions
#9
Siyan Zhao, Ali Israr, Micah Fenner, Roberta Klatzky
Information provided by sensory systems is inherently ambiguous as to its source in the physical world. To arrive at a coherent representation, perception deploys heuristic rules and multimodal input, which potentially produce errors such as illusions. The current work uses these effects to create apparent tactile motion and illusory depth motion using sparse vibrotactile stimulation across the hands. Experiment 1 showed the effects of vibrotactile duration and temporal separation between the hands on the quality of perceived illusory linear motion...
March 13, 2017: IEEE Transactions on Haptics
https://www.readbyqxmd.com/read/28317116/anatomical-segmentation-of-the-human-medial-prefrontal-cortex
#10
M Córcoles-Parada, Ncj Müller, M Ubero, V M Serrano-Del-Pueblo, F Mansilla, P Marcos-Rabal, E Artacho-Pérula, M Dresler, R Insausti, G Fernández, M Muñoz-López
The medial prefrontal areas 32, 24, 14, and 25 (mPFC) form part of the limbic memory system, but little is known about their functional specialization in humans. To add anatomical precision to structural and functional MRI data, we aimed to identify these mPFC subareas in histological preparations of human brain tissue, determine sulci most consistently related with mPFC areal boundaries, and use these sulci to delineate mPFC areas in MRIs. To achieve this, we obtained 3D MRI data from 11 ex vivo hemispheres and processed them for cyto- and myelo-architectonic analysis...
March 20, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28316236/webmolcs-a-web-based-interface-for-visualizing-molecules-in-3d-chemical-spaces
#11
Mahendra Awale, Daniel Probst, Jean-Louis Reymond
The concept of chemical space provides a convenient framework to analyze large collections of molecules by placing them in property spaces where distances represent similarities. Here we report webMolCS, a new type of web-based interface visualizing up to 5000 user-defined molecules in six different 3D chemical spaces obtained by principal component analysis or similarity mapping of multi-dimensional property spaces describing composition (MQN: 42D Molecular Quantum Numbers, SMIfp: 34D SMILES fingerprint), shapes and pharmacophores (APfp: 20D atom pair fingerprint, Xfp: 55D category extended atom pair fingerprint), and substructures (Sfp: 1024D binary substructure fingerprint, ECfp4: 1024D extended connectivity fingerprint)...
March 19, 2017: Journal of Chemical Information and Modeling
https://www.readbyqxmd.com/read/28315820/evaluating-differential-nuclear-dna-yield-rates-and-osteocyte-numbers-among-human-bone-tissue-types-a-synchrotron-radiation-micro-ct-approach
#12
Janna M Andronowski, Amy Z Mundorff, Isaac V Pratt, Jon M Davoren, David M L Cooper
Molecular human identification has conventionally focused on DNA sampling from dense, weight-bearing cortical bone tissue, typically from femora or tibiae. A comparison of skeletal elements from three contemporary individuals demonstrated that elements with high quantities of cancellous bone yielded nuclear DNA at the highest rates, suggesting that preferentially sampling cortical bone may be suboptimal (Mundorff & Davoren, 2014). Despite these findings, the reason for the differential DNA yields between cortical and cancellous bone tissues remains unknown...
March 6, 2017: Forensic Science International. Genetics
https://www.readbyqxmd.com/read/28314905/comparison-of-two-and-three-dimensional-display-for-performance-of-laparoscopic-total-gastrectomy-for-gastric-cancer
#13
Shingo Kanaji, Satoshi Suzuki, Hitoshi Harada, Masayasu Nishi, Masashi Yamamoto, Takeru Matsuda, Taro Oshikiri, Tetsu Nakamura, Yasuhiro Fujino, Masahiro Tominaga, Yoshihiro Kakeji
PURPOSE: Introduction of three-dimensional (3D) display might remove technical obstacles of laparoscopic surgery and improve laparoscopic skills. We analyzed the effect of 3D technology on operative performance during laparoscopic total gastrectomy (LTG) for gastric cancer and assessed its advantages over two-dimensional (2D) laparoscopy. METHODS: This study included 30 consecutive surgeries of LTG with esophagojejunostomy by the overlap method performed (3D group, n = 15, 2D group, n = 15)...
March 17, 2017: Langenbeck's Archives of Surgery
https://www.readbyqxmd.com/read/28304371/a-scalable-diffraction-based-scanning-3d-colour-video-display-as-demonstrated-by-using-tiled-gratings-and-a-vertical-diffuser
#14
Jia Jia, Jhensi Chen, Jun Yao, Daping Chu
A high quality 3D display requires a high amount of optical information throughput, which needs an appropriate mechanism to distribute information in space uniformly and efficiently. This study proposes a front-viewing system which is capable of managing the required amount of information efficiently from a high bandwidth source and projecting 3D images with a decent size and a large viewing angle at video rate in full colour. It employs variable gratings to support a high bandwidth distribution. This concept is scalable and the system can be made compact in size...
March 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28303951/enhancing-the-sensitivity-of-magnetic-sensors-by-3d-metamaterial-shells
#15
Carles Navau, Rosa Mach-Batlle, Albert Parra, Jordi Prat-Camps, Sergi Laut, Nuria Del-Valle, Alvaro Sanchez
Magnetic sensors are key elements in our interconnected smart society. Their sensitivity becomes essential for many applications in fields such as biomedicine, computer memories, geophysics, or space exploration. Here we present a universal way of increasing the sensitivity of magnetic sensors by surrounding them with a spherical metamaterial shell with specially designed anisotropic magnetic properties. We analytically demonstrate that the magnetic field in the sensing area is enhanced by our metamaterial shell by a known factor that depends on the shell radii ratio...
March 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28302275/3d-vision-accelerates-laparoscopic-proficiency-and-skills-are-transferable-to-2d-conditions-a-randomized-trial
#16
Stine Maya Dreier Sørensen, Lars Konge, Flemming Bjerrum
BACKGROUND: Laparoscopy is difficult to master, in part because surgeons operate in a three-dimensional (3D) space guided by two-dimensional (2D) images. This trial explores the effect of 3D vision during a laparoscopic training program, and examine whether it is possible to transfer skills acquired with 3D conditions to 2D conditions. METHODS: We designed a randomized controlled trial where residents (n = 34) were randomized to proficiency-based laparoscopic simulator training under either 3D or 2D conditions...
March 9, 2017: American Journal of Surgery
https://www.readbyqxmd.com/read/28301075/clinical-performance-of-high-resolution-late-gadolinium-enhancement-imaging-with-compressed-sensing
#17
Tamer A Basha, Mehmet Akçakaya, Charlene Liew, Connie W Tsao, Francesca N Delling, Gifty Addae, Long Ngo, Warren J Manning, Reza Nezafat
PURPOSE: To evaluate diagnostic image quality of 3D late gadolinium enhancement (LGE) with high isotropic spatial resolution (∼1.4 mm(3) ) images reconstructed from randomly undersampled k-space using LOw-dimensional-structure Self-learning and Thresholding (LOST). MATERIALS AND METHODS: We prospectively enrolled 270 patients (181 men; 55 ± 14 years) referred for myocardial viability assessment. 3D LGE with isotropic spatial resolution of 1.4 ± 0.1 mm(3) was acquired at 1...
March 16, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28298968/feasibility-of-imaging-superficial-palmar-arch-using-micro-ultrasound-7t-and-3t-magnetic-resonance-imaging
#18
Alison N Pruzan, Audrey E Kaufman, Claudia Calcagno, Yu Zhou, Zahi A Fayad, Venkatesh Mani
AIM: To demonstrate feasibility of vessel wall imaging of the superficial palmar arch using high frequency micro-ultrasound, 7T and 3T magnetic resonance imaging (MRI). METHODS: Four subjects (ages 22-50 years) were scanned on a micro-ultrasound system with a 45-MHz transducer (Vevo 2100, VisualSonics). Subjects' hands were then imaged on a 3T clinical MR scanner (Siemens Biograph MMR) using an 8-channel special purpose phased array carotid coil. Lastly, subjects' hands were imaged on a 7T clinical MR scanner (Siemens Magnetom 7T Whole Body Scanner) using a custom built 8-channel transmit receive carotid coil...
February 28, 2017: World Journal of Radiology
https://www.readbyqxmd.com/read/28297299/comparison-of-liver-volumetry-on-contrast-enhanced-ct-images-one-semiautomatic-and-two-automatic-approaches
#19
Wei Cai, Baochun He, Yingfang Fan, Chihua Fang, Fucang Jia
This study was to evaluate the accuracy, consistency, and efficiency of three liver volumetry methods- one interactive method, an in-house-developed 3D medical Image Analysis (3DMIA) system, one automatic active shape model (ASM)-based segmentation, and one automatic probabilistic atlas (PA)-guided segmentation method on clinical contrast-enhanced CT images. Forty-two datasets, including 27 normal liver and 15 space-occupying liver lesion patients, were retrospectively included in this study. The three methods - one semiautomatic 3DMIA, one automatic ASM-based, and one automatic PA-based liver volumetry - achieved an accuracy with VD (volume difference) of -1...
November 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28297281/a-survey-on-table-tolerances-and-couch-overrides-in-radiotherapy
#20
Bonnie Chinsky, Rakesh Patel, Joshua Panfil, Murat Surucu, John C Roeske
The purpose of this study was to survey current departmental policies on treatment couch overrides and the values of table tolerances used clinically. A 25-question electronic survey on couch overrides and tolerances was sent to full members of the American Association of Physicists in Medicine (AAPM). The first part of the survey asked participants if table overrides were allowed at their institution, who was allowed to perform these overrides, and if imaging was required with overrides. The second part of the survey asked individuals to provide table tolerance data for the following treatment sites: brain/head and neck (H&N), lung, breast, abdomen/pelvis and prostate...
November 2016: Journal of Applied Clinical Medical Physics
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