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https://www.readbyqxmd.com/read/30111500/congenital-dislocation-of-the-knee-in-a-three-year-old-child-with-larsen-syndrome-treatment-with-a-hexapod-type-external-fixator
#1
Céline Klein, Yassine Bulaid, François Deroussen, Marie-Christine Plancq, Camille Printemps, Richard Gouron
Congenital knee dislocation (CDK) is a rare condition, and its treatment is subject to debate. Here, we report on a new treatment for CDK (using a hexapod-type external fixator, HEF) in a three-year-old child with Larsen syndrome and grade III anterior dislocations of both knees. The left knee was treated with serial splints, whereas an HEF was used to treat an irreducible dislocation of the right knee. Two HEF aluminium rings were applied surgically. The procedure involved a distraction of the knee, then tibial posterior translation, and lastly progressive flexion...
August 12, 2018: Knee
https://www.readbyqxmd.com/read/30058265/multispecies-coalescent-analysis-confirms-standing-phylogenetic-instability-in-hexapoda
#2
Lucas Freitas, Beatriz Mello, Carlos G Schrago
The multispecies coalescent (MSC) has been increasingly used in phylogenomic analyses due to the accommodation of gene tree topological heterogeneity by taking into account population-level processes, such as incomplete lineage sorting. In this sense, the phylogeny of insect species, which are characterized by their large effective population sizes, is suitable for a coalescent-based analysis. Furthermore, studies so far recovered short internal branches at early divergences of the insect tree of life, indicating fast evolutionary radiations that increase the probability of incomplete lineage sorting in deep time...
July 30, 2018: Journal of Evolutionary Biology
https://www.readbyqxmd.com/read/29960566/hexapod-hall-scanner-for-high-resolution-large-area-magnetic-imaging
#3
G K Perkins, M Kustov, E Lovell, M V Pettifer, L F Cohen
We demonstrate a six-axis scanning imaging apparatus using piezo bending actuators with a large scan range. The six axes of motion of the bending actuators together with the coupling mechanism to the translation stage allow complete control of the sensor position and orientation over the scanning surface, which is ideal for the use of planar sensors such as Hall devices. In particular, the design allows for in situ correction of the probe tilt angle so that the sensor distance to sample surface can be minimized...
June 2018: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29953218/monodisperse-magnetic-silica-hexapods
#4
Jae-Hyun Kim, Hye Jeong Hwang, Joon Suk Oh, Stefano Sacanna, Gi-Ra Yi
A simple yet versatile solution-based process to produce colloidal silica hexapods is developed in which various shapes of silica rods are grown on the faces of cubes in a controlled manner. In the presence of hematite cubic particles, water droplets nucleate on the surface of hematite by phase separation in pentanol. By adjusting the water concentration, six droplets can form on each face of the hematite cube. A silica precursor is then administered into the system, which gradually diffuses into the water droplets through the oil phase...
July 25, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29905767/the-multisystem-effects-of-simulated-agricultural-whole-body-vibration-on-acute-sensorimotor-physical-and-cognitive-performance
#5
Marcus Yung, Liana M Tennant, Stephan Milosavljevic, Catherine Trask
Background: Exposure to whole body vibration (WBV) is common in construction, agriculture, mining, and transportation. There is strong epidemiological evidence linking WBV with adverse health outcomes in the long-term, including low back pain. Fortunately, WBV exposure guidelines to prevent long-term musculoskeletal disorders and discomfort exist. In the shorter-term, it has been speculated that occupational levels of WBV may lead to increased risk of vehicle accidents and falls during egress; however, the acute effects of different vibration intensities remain poorly understood and it is uncertain whether established standards protect the worker from injurious short-term effects...
June 14, 2018: Annals of Work Exposures and Health
https://www.readbyqxmd.com/read/29896552/circular-hexapod-external-fixation-for-periprosthetic-tibial-fracture
#6
Michael J Assayag, Noam Bor, Guy Rubin, S Robert Rozbruch
A poor soft tissue envelope often accompanies periprosthetic tibia fracture around a well-fixed total knee arthroplasty and the tibial stem leaves little room for screw fixation. This article describes the practicability and effectiveness of a novel surgical technique using circular hexapod external fixation, in patients with this clinical scenario. It was applied for fixation of periprosthetic tibia fracture in 2 patients. Contact between the external fixation pins and the prosthesis was avoided. Using a web-based software program, a gradual reduction in all planes was achieved...
June 2018: Arthroplasty Today
https://www.readbyqxmd.com/read/29797094/functional-outcomes-of-the-failed-plate-fixation-in-distal-tibial-fractures-salvaged-by-hexapod-external-fixator
#7
Maketo Molepo, Annette-Christi Barnard, Franz Birkholtz, Kevin Tetsworth, Vaida Glatt, Erik Hohmann
PURPOSE: The purpose of this study was to evaluate the clinical and functional outcomes of failed plate fixation in distal tibia fractures salvaged with hexapod circular fixators. MATERIALS AND METHODS: The database of a specialized limb reconstruction center was searched for all patients with failed plate fixation undergoing limb reconstruction with a circular external fixator between 2008 and 2017. Patients between the ages of 18-65 years, with a symptomatic distal tibia malunion or non-union following plate and screw fixation were included...
May 24, 2018: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
https://www.readbyqxmd.com/read/29715837/experimental-investigation-in-nodal-aberration-theory-nat-with-a-customized-ritchey-chr%C3%A3-tien-system-third-order-coma
#8
Nan Zhao, Jonathan C Papa, Kyle Fuerschbach, Yanfeng Qiao, Kevin P Thompson, Jannick P Rolland
Nodal aberration theory (NAT) describes the aberration properties of optical systems without symmetry. NAT was fully described mathematically and investigated through real-ray tracing software, but an experimental investigation is yet to be realized. In this study, a two-mirror Ritchey-Chrétien telescope was designed and built, including testing of the mirrors in null configurations, for experimental investigation of NAT. A feature of this custom telescope is a high-precision hexapod that controls the secondary mirror of the telescope to purposely introduce system misalignments and quantify the introduced aberrations interferometrically...
April 2, 2018: Optics Express
https://www.readbyqxmd.com/read/29707059/posteromedial-bowing-of-the-tibia-a-benign-condition-or-a-case-for-limb-reconstruction
#9
J Wright, R A Hill, D M Eastwood, A Hashemi-Nejad, P Calder, S Tennant
Purpose: To review the initial deformity and subsequent remodelling in posteromedial bowing of the tibia and the outcome of limb reconstruction in this condition. Patients and Methods: In all, 38 patients with posteromedial bowing of the tibia presenting between 2000 and 2016 were identified. Mean follow-up from presentation was 78 months. A total of 17 patients underwent lengthening and deformity correction surgery, whilst three further patients are awaiting lengthening and deformity correction procedures...
April 1, 2018: Journal of Children's Orthopaedics
https://www.readbyqxmd.com/read/29674453/multiple-large-scale-gene-and-genome-duplications-during-the-evolution-of-hexapods
#10
Zheng Li, George P Tiley, Sally R Galuska, Chris R Reardon, Thomas I Kidder, Rebecca J Rundell, Michael S Barker
Polyploidy or whole genome duplication (WGD) is a major contributor to genome evolution and diversity. Although polyploidy is recognized as an important component of plant evolution, it is generally considered to play a relatively minor role in animal evolution. Ancient polyploidy is found in the ancestry of some animals, especially fishes, but there is little evidence for ancient WGDs in other metazoan lineages. Here we use recently published transcriptomes and genomes from more than 150 species across the insect phylogeny to investigate whether ancient WGDs occurred during the evolution of Hexapoda, the most diverse clade of animals...
May 1, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29653265/proteomic-analysis-of-chemosensory-organs-in-the-honey-bee-parasite-varroa-destructor-a-comprehensive-examination-of-the-potential-carriers-for-semiochemicals
#11
Immacolata Iovinella, Alison McAfee, Guido Mastrobuoni, Stefan Kempa, Leonard J Foster, Paolo Pelosi, Francesca Romana Dani
We have performed a proteomic analysis on chemosensory organs of Varroa destructor, the honey bee mite, in order to identify putative soluble carriers for pheromones and other olfactory cues emitted by the host. In particular, we have analysed forelegs, mouthparts (palps, chelicera and hypostome) and the second pair of legs (as control tissue) in reproductive and phoretic stages of the Varroa life cycle. We identified 958 Varroa proteins, most of them common to the different organs and stages. Sequence analysis shows that four proteins can be assigned to the odorant-binding protein (OBP)-like class, which bear some similarity to insect OBPs, but so far have only been reported in some Chelicerata...
June 15, 2018: Journal of Proteomics
https://www.readbyqxmd.com/read/29651555/larval-neurogenesis-in-the-copepod-tigriopus-californicus-tetraconata-multicrustacea
#12
Hendrikje Hein, Gerhard Scholtz
Arthropod early neurogenesis shows distinct patterns that have been interpreted in an evolutionary framework. For instance, crustaceans and Hexapoda form the taxon Tetraconata and share the differentiation of specific neural precursors, the neuroblasts, a character which sets them apart from Chelicerata and Myriapoda. Neuroblasts are relatively large stem cells that generate ganglion mother cells by asymmetric divisions. Ganglion mother cells typically divide once to give rise to neurons and glia cells. In hexapods, neuroblasts segregate from the neuroectoderm before they begin their characteristic proliferative activity...
March 2018: Development Genes and Evolution
https://www.readbyqxmd.com/read/29607929/enhanced-activity-of-immunosuppressive-oligodeoxynucleotides-by-incorporating-them-into-hexapod-like-nanostructured-dna
#13
Yuki Araie, Yosuke Takahashi, Yuki Takahashi, Yoshinobu Takakura, Makiya Nishikawa
A151 and other immunosuppressive oligodeoxynucleotides that act as Toll-like receptor (TLR) 9 antagonists are candidate agents for the treatment of autoimmune and inflammatory diseases in which TLR9 activation leads to harmful immune responses. Their efficient delivery to TLR9-positive target cells will increase their potency, but few attempts have been made to enhance their delivery. We previously reported that hexapod-like nanostructured DNA (hexapodna) enhanced the activity of immunostimulatory cytosine-phosphate-guanine (CpG) DNA by efficiently delivering it to immune cells...
2018: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/29550582/a-deep-learning-approach-for-pose-estimation-from-volumetric-oct-data
#14
Nils Gessert, Matthias Schlüter, Alexander Schlaefer
Tracking the pose of instruments is a central problem in image-guided surgery. For microscopic scenarios, optical coherence tomography (OCT) is increasingly used as an imaging modality. OCT is suitable for accurate pose estimation due to its micrometer range resolution and volumetric field of view. However, OCT image processing is challenging due to speckle noise and reflection artifacts in addition to the images' 3D nature. We address pose estimation from OCT volume data with a new deep learning-based tracking framework...
May 2018: Medical Image Analysis
https://www.readbyqxmd.com/read/29531709/chemical-signaling-and-insect-attraction-is-a-conserved-trait-in-yeasts
#15
Paul G Becher, Arne Hagman, Vasiliki Verschut, Amrita Chakraborty, Elżbieta Rozpędowska, Sébastien Lebreton, Marie Bengtsson, Gerhard Flick, Peter Witzgall, Jure Piškur
Yeast volatiles attract insects, which apparently is of mutual benefit, for both yeasts and insects. However, it is unknown whether biosynthesis of metabolites that attract insects is a basic and general trait, or if it is specific for yeasts that live in close association with insects. Our goal was to study chemical insect attractants produced by yeasts that span more than 250 million years of evolutionary history and vastly differ in their metabolism and lifestyle. We bioassayed attraction of the vinegar fly Drosophila melanogaster to odors of phylogenetically and ecologically distinct yeasts grown under controlled conditions...
March 2018: Ecology and Evolution
https://www.readbyqxmd.com/read/29489831/simple-analytical-model-reveals-the-functional-role-of-embodied-sensorimotor-interaction-in-hexapod-gaits
#16
Yuichi Ambe, Shinya Aoi, Timo Nachstedt, Poramate Manoonpong, Florentin Wörgötter, Fumitoshi Matsuno
Insects have various gaits with specific characteristics and can change their gaits smoothly in accordance with their speed. These gaits emerge from the embodied sensorimotor interactions that occur between the insect's neural control and body dynamic systems through sensory feedback. Sensory feedback plays a critical role in coordinated movements such as locomotion, particularly in stick insects. While many previously developed insect models can generate different insect gaits, the functional role of embodied sensorimotor interactions in the interlimb coordination of insects remains unclear because of their complexity...
2018: PloS One
https://www.readbyqxmd.com/read/29466382/mating-and-aggregative-behaviors-among-basal-hexapods-in-the-early-cretaceous
#17
Alba Sánchez-García, Enrique Peñalver, Xavier Delclòs, Michael S Engel
Among the many challenges in paleobiology is the inference and reconstruction of behaviors that rarely, if ever, leave a physical trace on the environment that is suitable for fossilization. Of particular significance are those behaviors tied to mating and courtship, individual interactions critical for species integrity and continuance, as well as those for dispersal, permitting the taxon to expand its distribution as well as access new habitats in the face of local or long-term environmental change. In this context, two recently discovered fossils from the Early Cretaceous amber of Spain (ca...
2018: PloS One
https://www.readbyqxmd.com/read/29403068/cpap3-proteins-in-the-mineralized-cuticle-of-a-decapod-crustacean
#18
Shai Abehsera, Shir Zaccai, Binyamin Mittelman, Lilah Glazer, Simy Weil, Isam Khalaila, Geula Davidov, Ronit Bitton, Raz Zarivach, Shihao Li, Fuhua Li, Jianhai Xiang, Rivka Manor, Eliahu D Aflalo, Amir Sagi
The pancrustacean theory groups crustaceans and hexapods (once thought to comprise separate clades within the Arthropoda) into a single clade. A key feature common to all pancrustaceans is their chitinous exoskeleton, with a major contribution by cuticular proteins. Among these, are the CPAP3's, a family of cuticular proteins, first identified in the hexapod Drosophila melanogaster and characterized by an N-terminal signaling peptide and three chitin-binding domains. In this study, CPAP3 proteins were mined from a transcriptomic library of a decapod crustacean, the crayfish Cherax quadricarinatus...
February 5, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29376344/highly-stable-spherical-metallo-capsule-from-a-branched-hexapodal-terpyridine-and-its-self-assembled-berry-type-nanostructure
#19
Mingzhao Chen, Jun Wang, Die Liu, Zhilong Jiang, Qianqian Liu, Tun Wu, Haisheng Liu, Weidong Yu, Jun Yan, Pingshan Wang
Discrete spherical metallo-organic capsules at the nanometer scale, especially those constructed from unique building blocks, have received significant attention recently because of their fascinating molecular aesthetics and potential applications due to their compact cavities. Here, the synthesis and characterization of a hexapodal, branched terpyridine ligand are presented along with the nearly quantitative self-assembly of the resulting tetrameric metallo-nanosphere. This metallo-nanosphere exhibited four quasi-triangular and six rhombus-like facets, all of which were made by the same hook-like bis-terpyridine...
February 21, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29363013/the-tibial-bayonet-method-of-wound-closure
#20
Peter O'Farrell, Annette-Christi Barnard, Franz Birkholtz
Management of open lower limb fractures with soft tissue defects can be a technically challenging orthopaedic problem. Limited availability of orthoplastic services means that alternatives to the fix and flap concept are required in order to prevent infected non-unions from developing. The proposed 'bayonet apposition' allows the surgeon to temporarily shorten the limb without angulating the limb or creating a bone defect and removing viable bone. The viable bone edges are overlapped in a bayonet-like manner in order to appose the wound and skin edges...
August 2018: Strategies in Trauma and Limb Reconstruction
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