keyword
MENU ▼
Read by QxMD icon Read
search

hexapod

keyword
https://www.readbyqxmd.com/read/28428035/evaluation-of-the-external-fixator-truelok-hexapod-system-for-tibial-deformity-correction-in-children
#1
Sébastien Pesenti, Christopher A Iobst, Franck Launay
BACKGROUND: Tibial deformities are common in paediatric orthopaedic practice. Correcting multiplanar tibial deformities associated with lower limb length discrepancycan be challenging. Hexapod external fixation with gradual correction has been proven effective in this situation. OBJECTIVE: To assess clinical and radiological outcomes of gradual tibial deformity correction using the external fixator TL-HEX(TM)(Orthofix) in children. HYPOTHESIS: TL-HEX™ is effective in correcting tibial deformities in children...
April 17, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28422047/template-for-the-neural-control-of-directed-stepping-generalized-to-all-legs-of-mantisbot
#2
Nicholas Stephen Szczecinski, Roger Quinn
We previously developed a neural controller for one leg of our six-legged robot, MantisBot, that could direct locomotion toward a goal by modulating leg-local reflexes with simple descending commands from a head sensor. In this work, we successfully apply an automated method to tune the control network for all three pairs of legs of our hexapod robot MantisBot in only 90 seconds with a desktop computer. Each foot's motion changes appropriately as the body's intended direction of travel changes. In addition, several results from studies of walking insects are captured by this model...
April 19, 2017: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/28385547/in-vitro-and-in-vivo-stimulation-of-toll-like-receptor-9-by-cpg-oligodeoxynucleotides-incorporated-into-polypod-like-dna-nanostructures
#3
Yosuke Takahashi, Tatsuoki Maezawa, Yuki Araie, Yuki Takahashi, Yoshinobu Takakura, Makiya Nishikawa
Cytosine-phosphate-guanine (CpG) DNA is known to increase the potency of vaccines. Here, in vitro and in vivo stimulation of Toll-like receptor 9 (TLR9) by CpG DNA incorporated into polypod-like DNA nanostructures was evaluated by measuring the levels of tumor necrosis factor alpha (TNF-α) released from macrophage-like RAW 264.7 cells and plasma interleukin (IL)-12p40 in vivo following intravenous injection into mice. Phosphodiester CpG1668 was selected as the CpG DNA, and tripodna and hexapodna, which were CpG1668-containing tripod and hexapod-like DNA nanostructures, respectively, were designed...
April 3, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28357471/mechanical-load-exerted-by-pet-g-aligners-during-mesial-and-distal-derotation-of-a-mandibular-canine-an-in-vitro-study
#4
F Elkholy, B Mikhaiel, F Schmidt, B G Lapatki
INTRODUCTION: The six force-moment (F/M) components exerted by aligners of different thickness during simulated mesiorotation and distorotation of a mandibular canine were studied. MATERIALS AND METHODS: An acrylic mandibular model with a separated right canine mounted on a hexapod via a 3D F/M sensor was used. Duran+(®) aligners (Scheu Dental, Germany) of thickness 0.5, 0.625, and 0.75 mm were fabricated on plaster models with the measurement tooth in its neutral position...
March 29, 2017: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
https://www.readbyqxmd.com/read/28342821/correction-of-axial-deformity-during-lengthening-in-fibular-hypoplasia-hexapodal-versus-monorail-external-fixation
#5
Antoine Chalopin, Loïc Geffroy, Sébastien Pesenti, Antoine Hamel, Franck Launay
INTRODUCTION: Childhood fibular hypoplasia is a rare pathology which may or may not involve limb-length discrepancy and axial deformity in one or more dimensions. The objective of the present study was to compare the quality of the axial correction achieved in lengthening procedures by hexapodal versus monorail external fixators. The hypothesis was that the hexapodal fixator provides more precise correction. MATERIAL AND METHODS: A retrospective multicenter study included 52 children with fibular hypoplasia...
March 22, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28337138/motor-skill-learning-in-an-insect-inspired-neuro-computational-control-system
#6
Eleonora Arena, Paolo Arena, Roland Strauss, Luca Patané
In nature, insects show impressive adaptation and learning capabilities. The proposed computational model takes inspiration from specific structures of the insect brain: after proposing key hypotheses on the direct involvement of the mushroom bodies (MBs) and on their neural organization, we developed a new architecture for motor learning to be applied in insect-like walking robots. The proposed model is a nonlinear control system based on spiking neurons. MBs are modeled as a nonlinear recurrent spiking neural network (SNN) with novel characteristics, able to memorize time evolutions of key parameters of the neural motor controller, so that existing motor primitives can be improved...
2017: Frontiers in Neurorobotics
https://www.readbyqxmd.com/read/28316142/evolutionary-ecology-of-beta-lactam-gene-clusters-in-animals
#7
Wouter Suring, Karen Meusemann, Alexander Blanke, Janine Mariën, Tim Schol, Valeria Agamennone, Anna Faddeeva-Vakhrusheva, Matty P Berg, Bram Brouwer, Nico M van Straalen, Dick Roelofs
Beta-lactam biosynthesis was thought to occur only in fungi and bacteria, but we recently reported the presence of isopenicillin N synthase in a soil-dwelling animal, Folsomia candida. However, it has remained unclear whether this gene is part of a larger beta-lactam biosynthesis pathway and how widespread the occurrence of penicillin biosynthesis is among animals. Here, we analyzed the distribution of beta-lactam biosynthesis genes throughout the animal kingdom and identified a beta-lactam gene cluster in the genome of F...
March 18, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28290669/coordination-controlled-one-dimensional-molecular-chains-in-hexapodal-adenine-silver-ultrathin-films
#8
R Kamal Saravanan, Prithwidip Saha, Viruthakasi Venkatesh, Thiruvancheril G Gopakumar, Sandeep Verma
Growth of a silver coordination polymer of a C3-symmetric hexaadenine ligand is studied on highly oriented pyrolytic graphite (HOPG), using high-resolution atomic force microscopy (AFM). This unusual ligand offers 6-fold multidentate coordination sites, and consequently, a multidimensional growth of coordination polymer is expected. Notably, each discrete hexapodal unit is bridged by two silver ions along one of the crystallographic directions, resulting in high interaction energy along this direction. When the polymer was deposited on an HOPG surface from a dilute solution, we observed abundant one-dimensional (1D) coordination polymer chains, with a minimum width of approximately 4...
April 3, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28273908/specialized-adaptations-for-springtail-predation-in-mesozoic-beetles
#9
Zi-Wei Yin, Chen-Yang Cai, Di-Ying Huang, Li-Zhen Li
Insects exhibit a variety of morphological specializations specific to particular behaviors, and these permit the reconstruction of palaeobiological traits. Despite the critical importance of predator-prey strategies in insect evolution, the appearance of particular aspects of predation are often difficult to determine from the fossil record of hexapods. Here we report the discovery of highly specialized, mid-Cretaceous ant-like stone beetles (Staphylinidae: Scydmaeninae) displaying morphological modifications unknown among living scydmaenids and associated with predation on springtails (Collembola), a widespread and abundant group of significantly greater geological age...
December 2017: Scientific Reports
https://www.readbyqxmd.com/read/28267607/amalga-like-virus-infecting-antonospora-locustae-a-microsporidian-pathogen-of-grasshoppers-plus-related-viruses-associated-with-other-arthropods
#10
Jesse D Pyle, Patrick J Keeling, Max L Nibert
A previously reported Expressed Sequence Tag (EST) library from spores of microsporidian Antonospora locustae includes a number of clones with sequence similarities to plant amalgaviruses. Reexamining the sequence accessions from that library, we found additional such clones, contributing to a 3247-nt contig that approximates the length of an amalga-like virus genome. Using A. locustae spores stored from that previous study, and new ones obtained from the same source, we newly visualized the putative dsRNA genome of this virus and obtained amplicons yielding a 3387-nt complete genome sequence...
March 4, 2017: Virus Research
https://www.readbyqxmd.com/read/28254458/the-cortical-spatiotemporal-correlate-of-otolith-stimulation-vestibular-evoked-potentials-by-body-translations
#11
M Ertl, M Moser, R Boegle, J Conrad, P Zu Eulenburg, M Dieterich
The vestibular organ senses linear and rotational acceleration of the head during active and passive motion. These signals are necessary for bipedal locomotion, navigation, the coordination of eye and head movements in 3D space. The temporal dynamics of vestibular processing in cortical structures have hardly been studied in humans, let alone with natural stimulation. The aim was to investigate the cortical vestibular network related to natural otolith stimulation using a hexapod motion platform. We conducted two experiments, 1...
February 22, 2017: NeuroImage
https://www.readbyqxmd.com/read/28211509/climbing-favours-the-tripod-gait-over-alternative-faster-insect-gaits
#12
Pavan Ramdya, Robin Thandiackal, Raphael Cherney, Thibault Asselborn, Richard Benton, Auke Jan Ijspeert, Dario Floreano
To escape danger or catch prey, running vertebrates rely on dynamic gaits with minimal ground contact. By contrast, most insects use a tripod gait that maintains at least three legs on the ground at any given time. One prevailing hypothesis for this difference in fast locomotor strategies is that tripod locomotion allows insects to rapidly navigate three-dimensional terrain. To test this, we computationally discovered fast locomotor gaits for a model based on Drosophila melanogaster. Indeed, the tripod gait emerges to the exclusion of many other possible gaits when optimizing fast upward climbing with leg adhesion...
February 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/28183867/propulsion-in-hexapod-locomotion-how-do-desert-ants-traverse-slopes
#13
Toni Wöhrl, Lars Reinhardt, Reinhard Blickhan
The employment of an alternating tripod gait to traverse uneven terrains is a common characteristic shared among many hexapoda. Since this could be one specific cause for their ecological success, we examined the alternating tripod gait of the desert ant Cataglyphis fortis together with their ground reaction forces and weight-specific leg impulses for level locomotion and on moderate (±30°) and steep (±60°) slopes in order to understand mechanical functions of individual legs during inclined locomotion...
February 9, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28157918/influence-of-axial-force-errors-on-the-deformation-of-the-4%C3%A2-%C3%A2-m-lightweight-mirror-and-its-correction
#14
Bin Lan, Xiaoxia Wu, Jianfeng Li, Ming Ming, Xiangyi Liu, Hongbo Yang
The lightweight primary mirror of the four meter Chinese telescope is supported axially by a passive hydraulic system, in parallel with an active system. The figure is sensitive to the errors in the axial forces, which can be effectively corrected using active optics. The squared RMS of this figure approximately follows the χ<sup>2</sup> distribution, as verified by Monte Carlo analysis. The probability distributions of the squared norm of the active-forces vector, of the squared norm of the leg-lengths vector in the hexapod platform, and of the squared RMS of the residual figure are discussed in terms of the bending modes obtained by singular-value decomposition of the influence matrix, the optical sensitivity matrix deduced through ray trace, and the Jacobian matrix of the hexapod platform...
January 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28148674/computer-hexapod-assisted-orthopaedic-surgery-provides-a-predictable-and-safe-method-of-femoral-deformity-correction
#15
A Hughes, N Heidari, S Mitchell, J Livingstone, M Jackson, R Atkins, F Monsell
AIMS: Computer hexapod assisted orthopaedic surgery (CHAOS), is a method to achieve the intra-operative correction of long bone deformities using a hexapod external fixator before definitive internal fixation with minimally invasive stabilisation techniques. The aims of this study were to determine the reliability of this method in a consecutive case series of patients undergoing femoral deformity correction, with a minimum six-month follow-up, to assess the complications and to define the ideal group of patients for whom this treatment is appropriate...
February 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28110891/femoral-lengthening-in-children-and-adolescents
#16
REVIEW
Z Pejin
Current lengthening techniques are still based on the Ilizarov method and the concept of callotasis. Research and progress in medical devices have led to constant improvement in results. Hexapod fixators allow more precise correction of complex deformities, with shorter learning curve. Associating lengthening by external fixation (EF) to internal fixation (K-wire, intramedullary nail or locking plate) has reduced EF times and complications rates, while improving anatomic and functional results. Lengthening nails provides faster recovery of range of motion and return to activity during lengthening and consolidation, with better psychological tolerance...
January 16, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28046558/su-f-t-484-initial-evaluation-of-a-novel-6d-qa-phantom-hexacheck-for-daily-6d-couch-correction-assessment
#17
J E Roring, D Stanley, N Papanikolaou, A N Gutierrez
PURPOSE: Treatment couches with 6D correction capabilities have become a regular part of IGRT. While 6D couches have been shown to function mechanically well, phantoms for daily angular QA accuracy assessment have yet to be commercially available. Standard Imaging™ has developed a phantom designed for daily verification of pitch, roll, and yaw corrections. In this study, the mechanical integrity, reproducibility, and daily 6D correction stability of the phantom using both volumetric (Elekta- XVI kV-CBCT) and orthogonal kV (Brainlab ExacTrac) imaging was evaluated...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28028122/evolution-of-chemosensory-gene-families-in-arthropods-insight-from-the-first-inclusive-comparative-transcriptome-analysis-across-spider-appendages
#18
Joel Vizueta, Cristina Frías-López, Nuria Macías-Hernández, Miquel A Arnedo, Alejandro Sánchez-Gracia, Julio Rozas
Unlike hexapods and vertebrates, in chelicerates, knowledge of the specific molecules involved in chemoreception comes exclusively from the comparative analysis of genome sequences. Indeed, the genomes of mites, ticks and spiders contain several genes encoding homologs of some insect membrane receptors and small soluble chemosensory proteins. Here, we conducted for the first time a comprehensive comparative RNA-Seq analysis across different body structures of a chelicerate: the nocturnal wandering hunter spider Dysdera silvatica Schmidt 1981...
January 1, 2017: Genome Biology and Evolution
https://www.readbyqxmd.com/read/27989966/origin-and-evolution-of-the-panarthropod-head-a-palaeobiological-and-developmental-perspective
#19
Javier Ortega-Hernández, Ralf Janssen, Graham E Budd
The panarthropod head represents a complex body region that has evolved through the integration and functional specialization of the anterior appendage-bearing segments. Advances in the developmental biology of diverse extant organisms have led to a substantial clarity regarding the relationships of segmental homology between Onychophora (velvet worms), Tardigrada (water bears), and Euarthropoda (e.g. arachnids, myriapods, crustaceans, hexapods). The improved understanding of the segmental organization in panarthropods offers a novel perspective for interpreting the ubiquitous Cambrian fossil record of these successful animals...
December 18, 2016: Arthropod Structure & Development
https://www.readbyqxmd.com/read/27939714/the-rapidly-changing-landscape-of-insect-phylogenetics
#20
REVIEW
David R Maddison
Insect phylogenetics is being profoundly changed by many innovations. Although rapid developments in genomics have center stage, key progress has been made in phenomics, field and museum science, digital databases and pipelines, analytical tools, and the culture of science. The importance of these methodological and cultural changes to the pace of inference of the hexapod Tree of Life is discussed. The innovations have the potential, when synthesized and mobilized in ways as yet unforeseen, to shine light on the million or more clades in insects, and infer their composition with confidence...
December 2016: Current Opinion in Insect Science
keyword
keyword
64026
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"