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https://www.readbyqxmd.com/read/28432217/rar%C3%AE-2-is-required-for-vertebrate-somitogenesis
#1
Amanda Janesick, Weiyi Tang, Tuyen T L Nguyen, Bruce Blumberg
During vertebrate somitogenesis, retinoic acid is known to establish the position of the determination wavefront, controlling where new somites are permitted to form along the anteroposterior body axis. Less is understood about how RAR regulates somite patterning, rostral-caudal boundary setting, specialization of myotome subdivisions, or the specific RAR subtype that is required for somite patterning. Characterizing the function of RARβ has been challenging due to the absence of embryonic phenotypes in murine loss-of-function studies...
April 21, 2017: Development
https://www.readbyqxmd.com/read/28405710/-distal-osteotomy-for-the-treatment-of-hallux-valgus-chevron-osteotomy
#2
C Stukenborg-Colsman, L Claaßen, S Ettinger, D Yao, M Lerch, C Plaaß
Distal osteotomies, like the Chevron osteotomy, is indicated for mild to moderate hallux valgus deformities. Splayfoot, painful pseudoexostosis, and transfer metatasalgia are observed in the clinical examination. Radiographic examination should be done with weight bearing in two planes. Preoperatively the intermetatarsal (IM), hallux valgus, and distal metatarsal articular (DMAA) angles should be measured. The operative technique is based on soft tissue and bony correction. Modifications of the osteotomy allow a shortening, lengthening, or neutral correction of the first metatarsal...
April 12, 2017: Der Orthopäde
https://www.readbyqxmd.com/read/28397886/2d-supramolecular-networks-of-dibenzonitrilediacetylene-on-ag-111-stabilized-by-intermolecular-hydrogen-bonding
#3
G Galeotti, M Ebrahimi, J Lipton-Duffin, J M MacLeod, S Rondeau-Gagné, J-F Morin, F Rosei
The two-dimensional (2D) surface-directed self-assembly of dibenzonitrile diacetylene (DBDA) on Ag(111) under ultrahigh vacuum (UHV) conditions was investigated by combining scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS) and theoretical simulations based on density functional theory (DFT) calculations. The molecule consists of two benzonitrile groups (-C6H4-C[triple bond, length as m-dash]N) on each side of a diacetylene (-C[triple bond, length as m-dash]C-C[triple bond, length as m-dash]C-) backbone...
April 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28392020/adm-guidance-ceramics-fracture-toughness-testing-and-method-selection
#4
REVIEW
Paulo Francisco Cesar, Alvaro Della Bona, Susanne S Scherrer, Michael Tholey, Richard van Noort, Alessandro Vichi, Robert Kelly, Ulrich Lohbauer
OBJECTIVES: The objective is within the scope of the Academy of Dental Materials Guidance Project, which is to provide dental materials researchers with a critical analysis of fracture toughness (FT) tests such that the assessment of the FT of dental ceramics is conducted in a reliable, repeatable and reproducible way. METHODS: Fracture mechanics theory and FT methodologies were critically reviewed to introduce basic fracture principles and determine the main advantages and disadvantages of existing FT methods from the standpoint of the dental researcher...
April 6, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28391704/effect-of-bipartite-hallucal-sesamoid-on-hallux-valgus-surgery
#5
Young Hwan Park, Chan Dong Jeong, Gi Won Choi, Hak Jun Kim
BACKGROUND: Bipartite hallucal sesamoids are often found in patients with hallux valgus. However, it is unknown whether bipartite hallucal sesamoids affect the results of hallux valgus surgery or not. The purpose of the present study was to evaluate the outcomes of chevron osteotomy for hallux valgus with and without bipartite hallucal sesamoid. METHODS: A total of 152 patients (168 feet) treated with distal or proximal chevron osteotomy for hallux valgus constituted the study cohort...
April 1, 2017: Foot & Ankle International
https://www.readbyqxmd.com/read/28365147/the-bare-area-of-the-proximal-ulna-an-anatomic-study%C3%A2-with-relevance-to-chevron-osteotomy
#6
Rongguang Ao, Xu Zhang, Dejian Li, Fancheng Chen, Jianhua Zhou, Baoqing Yu
PURPOSE: A chevron osteotomy of the ulna is widely used to obtain intra-articular access to the elbow in the treatment of type C distal humerus fractures. The trochlear notch of the proximal ulna is divided into 2 articular parts by the "bare area." Ideally, the olecranon osteotomy should be centered on the bare area to minimize damage to the joint cartilage. The goals of this study were to describe the anatomy of the bare area and design an ideal chevron-shaped osteotomy. METHODS: We dissected 38 cadaver elbows and measured the width of the bare area, the distance between the tip of the triceps insertion and the area on the olecranon cortex corresponding to the bare area...
March 29, 2017: Journal of Hand Surgery
https://www.readbyqxmd.com/read/28343314/rectus-abdominis-atrophy-after-ventral-abdominal-incisions-midline-versus-chevron
#7
Y Vigneswaran, E Poli, M S Talamonti, S P Haggerty, J G Linn, M B Ujiki
PURPOSE: Although many outcomes have been compared between a midline and chevron incision, this is the first study to examine rectus abdominis atrophy after these two types of incisions. METHODS: Patients undergoing open pancreaticobiliary surgery between 2007 and 2011 at our single institution were included in this study. Rectus abdominis muscle thickness was measured on both preoperative and follow-up computed tomography (CT) scans to calculate percent atrophy of the muscle after surgery...
March 25, 2017: Hernia: the Journal of Hernias and Abdominal Wall Surgery
https://www.readbyqxmd.com/read/28264339/two-new-species-of-i-melanorivulus-i-cyprinodontiformes-cynolebiidae-from-rio-verde-drainage-upper-rio-paran%C3%A3-basin-brazil
#8
Matheus Vieira Volcan, Bruno Klotzel, Luis Esteban Krause Lanés
Two new species of the genus Melanorivulus are herein described from the middle Rio Verde drainage, upper Rio Paraná basin, Mato Grosso do Sul, Brazil. Both new species are members of the Melanorivulus pictus clade, diagnosed by having ventral process of angulo-articular vestigial and flanks intense greenish blue or greenish golden to purplish blue above anal fin base in males. Melanorivulus nigropunctatus, new species, from wetlands of a small drainage tributary of right side of the Rio Verde, differs from all other congeners by possessing black dots over the head and body in both sexes and pectoral fin orange with a dark grey margin in males...
February 21, 2017: Zootaxa
https://www.readbyqxmd.com/read/28258948/distal-oblique-metatarsal-osteotomy-for-hallux-valgus-deformity-a-clinical-analysis
#9
Olcay Guler, Barıs Yilmaz, Serhat Mutlu, Mehmet Halis Cerci, Nurettin Heybeli
We compared the outcomes of the distal oblique metatarsal (DOM) osteotomy, which is parallel to the articulation surface of the proximal phalanx, with those of the Chevron osteotomy and evaluated whether displacement and shortening of the first metatarsal have any effect on the incidence of metatarsalgia and patient satisfaction. Patients treated with the DOM osteotomy (n = 30) or distal Chevron osteotomy (n = 31) were evaluated retrospectively. The Chevron and DOM osteotomies both provided significant improvement in the first intermetatarsal angle (p < ...
February 28, 2017: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/28237566/preliminary-results-and-learning-curve-of-the-minimally-invasive-chevron-akin-operation-for-hallux-valgus
#10
Charlie R J Jowett, Harvinder S Bedi
Minimally invasive surgery is increasing in popularity. It is relevant in hallux valgus surgery owing to the potential for reduced disruption of the soft tissues and improved wound healing. We present our results and assess the learning curve of the minimally invasive Chevron Akin operation for hallux valgus. A total of 120 consecutive feet underwent minimally invasive Chevron Akin for symptomatic hallux valgus, of which 14 were excluded. They were followed up for a mean of 25 (range 18 to 38) months. The patients were clinically assessed using the American Orthopaedic Foot and Ankle Society score...
February 22, 2017: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/28159041/suture-fixation-of-an-akin-osteotomy-a-cost-effective-and-clinically-reliable-technique
#11
T Sinnett, Y Fang, E Nattfogel, A O'Gorman, C Charalambides
BACKGROUND: The Akin osteotomy is commonly performed as an adjunct to osteotomies of the first metatarsal for the correction of hallux valgus such as the scarf or chevron osteotomies. The Akin osteotomy is indicated for the correction of a hallux valgus interphalangeus and can be used supplementary in any first metatarsal osteotomy for a hallux valgus. Various techniques have been described for fixation of the osteotomy. Most commonly the osteotomy is held and fixed with metalwork consisting of either a staple [2,3], a screw [4,5] or wiring [6,7]...
March 2017: Foot and Ankle Surgery: Official Journal of the European Society of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/28103730/surgical-treatment-of-moderate-hallux-valgus
#12
Maki Grle, Goran Vrgoc, Ivan Bohacek, Vladimir Hohnjec, Marko Martinac, Iva Brkic, Lovro Stefan, Zdravko Jotanovic
PURPOSE: The purpose of the study was to determine whether lateral soft-tissue release (LSTR) has a beneficial or detrimental effect on the outcome of distal Chevron first metatarsal osteotomy (DCMO) in the treatment of moderate hallux valgus (HV). METHODS: We compared the effect of different surgical treatments in 2 groups of patients: group I (23 patients, 25 feet, average age of 55 [from 43 to 77] years) was subjected to DCMO only, whereas group II (18 patients, 23 feet, average age of 59 [from 52 to 70] years]) was subjected to DCMO with LSTR...
January 1, 2017: Foot & Ankle Specialist
https://www.readbyqxmd.com/read/28039639/a-novel-procedure-for-introducing-large-sheet-type-surgical-material-with-a-self-expanding-origami-structure-using-a-slim-trocar-chevron-pleats-procedure
#13
Yuen Nakase, Kei Nakamura, Akira Sougawa, Tomoyuki Nagata, Satoshi Mochizuki, Shouzo Kitai, Seishirou Inaba
BACKGROUND: Large sheet-type surgical materials (e.g., absorbable hemostat, adhesion barrier membranes, and flat surgical mesh) are difficult to introduce into a corporeal cavity using a 5-mm trocar; however, laparoscopic surgeries that use mainly 5-mm trocars are increasing. Furthermore, it is necessary not only to introduce but also to secure the applied surgical material and expand it from the original surgical site. To address these challenges, we developed a novel procedure for introducing such surgical materials into a corporeal cavity using a 5-mm trocar and a self-expanding origami structure, called the "chevron pleats procedure (CPP)"...
December 30, 2016: Surgical Endoscopy
https://www.readbyqxmd.com/read/28005292/early-results-using-a-biodegradable-magnesium-screw-for-modified-chevron-osteotomies
#14
Christian Plaass, Sarah Ettinger, Lena Sonnow, Soeren Koenneker, Yvonne Noll, Andreas Weizbauer, Janin Reifenrath, Leif Claassen, Kiriakos Daniilidis, Christina Stukenborg-Colsman, Henning Windhagen
This is the first larger study analyzing the use of magnesium-based screws for fixation of modified Chevron osteotomies in hallux valgus surgery. Forty-four patients (45 feet) were included in this prospective study. A modified Chevron osteotomy was performed on every patient and a magnesium screw used for fixation. The mean clinical follow up was 21.4 weeks. The mean age of the patients was 45.5 years. Forty patients could be provided with the implant, in four patients the surgeon decided to change to a standard metallic implant...
December 2016: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/27936761/solution-synthesized-chevron-graphene-nanoribbons-exfoliated-onto-h-si-100
#15
Adrian Radocea, Tao Sun, Timothy H Vo, Alexander Sinitskii, Narayana R Aluru, Joseph W Lyding
There has been tremendous progress in designing and synthesizing graphene nanoribbons (GNRs). The ability to control the width, edge structure, and dopant level with atomic precision has created a large class of accessible electronic landscapes for use in logic applications. One of the major limitations preventing the realization of GNR devices is the difficulty of transferring GNRs onto nonmetallic substrates. In this work, we developed a new approach for clean deposition of solution-synthesized atomically precise chevron GNRs onto H:Si(100) under ultrahigh vacuum...
December 12, 2016: Nano Letters
https://www.readbyqxmd.com/read/27933763/interfacial-self-assembly-of-atomically-precise-graphene-nanoribbons-into-uniform-thin-films-for-electronics-applications
#16
Mikhail Shekhirev, Timothy H Vo, Mohammad Mehdi Pour, Alexey Lipatov, Siddhanth Munukutla, Joseph W Lyding, Alexander Sinitskii
Because of their intriguing electronic and optical properties, atomically precise graphene nanoribbons (GNRs) are considered to be promising materials for electronics and photovoltaics. However, significant aggregation and low solubility of GNRs in conventional solvents result in their poor processability for materials characterization and device studies. In this paper, we demonstrate a new fabrication approach for large-scale uniform thin films of nonfunctionalized atomically precise chevron-type GNRs. The method is based on (1) the exceptional solubility of graphitic materials in chlorosulfonic acid and (2) the original interfacial self-assembly approach by which uniform films that are single-GNR (∼2 nm) thick can be routinely prepared...
December 23, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27888787/outcomes-in-chevron-osteotomy-for-hallux-valgus-in-a-large-cohort
#17
Bart van Groningen, M C Marieke van der Steen, Max Reijman, Janneke Bos, Johannes G E Hendriks
Clinical and radiological related outcomes have been reported for Chevron osteotomy as correction for mild to moderate hallux valgus, but only for relatively small patient series. Moreover, evaluation of the patient's point of view has mostly been conducted by means of more physician-based outcome measures. The goal of this study was to evaluate the effect of the Chevron osteotomy for hallux valgus on patients' daily lives using the Foot and Ankle Outcome Score (FAOS) as a validated and a hallux valgus specific patient reported outcome measure (PROM)...
December 2016: Foot
https://www.readbyqxmd.com/read/27830290/a-new-armored-archosauriform-diapsida-archosauromorpha-from-the-marine-middle-triassic-of-china-with-implications-for-the-diverse-life-styles-of-archosauriforms-prior-to-the-diversification-of-archosauria
#18
Chun Li, Xiao-Chun Wu, Li-Jun Zhao, Sterling J Nesbitt, Michelle R Stocker, Li-Ting Wang
Reptiles have a long history of transitioning from terrestrial to semi-aquatic or aquatic environments that stretches back at least 250 million years. Within Archosauria, both living crocodylians and birds have semi-aquatic members. Closer to the root of Archosauria and within the closest relatives of the clade, there is a growing body of evidence that early members of those clades had a semi-aquatic lifestyle. However, the morphological adaptations to a semi-aquatic environment remain equivocal in most cases...
December 2016: Die Naturwissenschaften
https://www.readbyqxmd.com/read/27811391/random-access-actuation-of-nanowire-grid-metamaterial
#19
Pablo Cencillo-Abad, Jun-Yu Ou, Eric Plum, João Valente, Nikolay I Zheludev
While metamaterials offer engineered static optical properties, future artificial media with dynamic random-access control over shape and position of meta-molecules will provide arbitrary control of light propagation. The simplest example of such a reconfigurable metamaterial is a nanowire grid metasurface with subwavelength wire spacing. Recently we demonstrated computationally that such a metadevice with individually controlled wire positions could be used as dynamic diffraction grating, beam steering module and tunable focusing element...
December 2, 2016: Nanotechnology
https://www.readbyqxmd.com/read/27810025/cost-effectiveness-of-different-techniques-in-hallux-valgus-surgery
#20
Emilio Wagner, Cristian Ortiz, Karen Torres, Ivan Contesse, Omar Vela, Diego Zanolli
BACKGROUND: Different surgical techniques are available to correct each type of Hallux Valgus (HV) deformity, and all present similar good results. No information is available relative to the cost of each technique compared to their individual success. OBJECTIVE: To determine the cost-effectiveness-ratio (CER) of five different techniques for HV. METHODS: We included 245HV surgeries performed in 179 patients. The severity was defined according to radiological parameters...
December 2016: Foot and Ankle Surgery: Official Journal of the European Society of Foot and Ankle Surgeons
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