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https://www.readbyqxmd.com/read/29764123/the-folding-pathways-and-thermodynamics-of-semiflexible-polymers
#1
Jing Wu, Chenqian Cheng, Gaoyuan Liu, Ping Zhang, Tao Chen
Inspired by the protein folding and DNA packing, we have systematically studied the thermodynamic and kinetic behaviors of single semiflexible homopolymers by Langevin dynamics simulations. In line with experiments, a rich variety of folding products, such as rod-like bundles, hairpins, toroids, and a mixture of them, are observed in the complete diagram of states. Moreover, knotted structures with a significant population are found in a certain range of bending stiffness in thermal equilibrium. As the solvent quality becomes poorer, the population of the intermediate occurring in the folding process increases, which leads to a severe chevron rollover for the folding arm...
May 14, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29671022/-the-minimally-invasive-chevron-and-akin-osteotomy-mica
#2
REVIEW
Sebastian Altenberger, Stefanie Kriegelstein, Oliver Gottschalk, Florian Dreyer, Alexander Mehlhorn, Anke Röser, Markus Walther
OBJECTIVE: Percutaneous correction of a hallux valgus deformity with or without transfer metatarsalgia. INDICATIONS: Hallux valgus deformity up to 20° intermetatarsal angle, without instability of the first tarsometatarsal joint. CONTRAINDICATIONS: Symptomatic arthritis of the first metatarsophalangeal joint, as well as instability of the first tarsometatarsal joint. SURGICAL TECHNIQUE: Percutaneous performed osteotomy of the distal metatarsal 1 in combination with a medial closing wedge osteotomy of the proximal phalanx of the first toe...
April 18, 2018: Operative Orthopädie und Traumatologie
https://www.readbyqxmd.com/read/29624681/a-new-species-of-astyanax-characiformes-characidae-from-costa-rica-and-panama-with-a-key-to-the-lower-central-american-species-of-the-genus
#3
A Angulo, A C Santos, M López, F Langeani, C D McMahan
Astyanax anai, a new species of characid fish, is described from the Sixaola River basin, eastern Costa Rica-western Panama, Central America. The new species can be distinguished from all other congeners by the following combination of characters: premaxillary teeth 4-5 at the inner series and 4-6 at the outer series; maxillary teeth tricuspid, 2-4; predorsal scale series irregular and incomplete, with an unscaled space behind tip of supraoccipital process and 12-14 scales; lateral line scales 34-39; humeral region with a conspicuous black and rounded to horizontally ovate spot and two diffuse brown and vertically elongate bars (the first through the rounded to horizontally ovate spot, the second 2-4 scales behind the first); body depth 36...
April 6, 2018: Journal of Fish Biology
https://www.readbyqxmd.com/read/29600669/-clinical-effect-modified-chevron-osteotomy-combined-with-lateral-tissue-loosening-in-treating-mild-moderate-hallux-valgus-through-internal-signal-approach
#4
Xue-Qiang Chen, Qun-Feng Wu, Wei-Qin Dong, Li-Xin Yu, Xiong-Feng Li
OBJECTIVE: To explore clinical effect of modified Chevron osteotomy combined with lateral tissue loosening for the treatment of mild-moderate hallux valgus through internal signal approach. METHODS: From July 2015 to June 2016, 26 patients with mild-moderate hallux valgus treated with modified Chevron osteotomy combined with lateral tissue loosening through internal signal approach, including 2 males and 24 females aged from 45 to 65 years old with an average of(54...
March 25, 2018: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29600667/-application-of-three-dimensional-printing-technology-to-design-individual-angle-section-on-chevron-of-hallux-valgus-osteotomy
#5
Yu-Hang Zhang, Da-Wei Bi, Yi-Min Chen, Gang Zu, Hai-Tao Ma
OBJECTIVE: To explore clinical application of three-dimensional printing technology to design individual angle section on Chevron of hallux valgus osteotomy. METHODS: From May 2013 to May 2016, 47 patients(66 feet) with mild to moderate hallux valgus treated by Chevron osteotomy according to different preoperative design were divided into computer osteotomy group(group A) and traditional osteotomy group(group B). In group A, there were 25 patients (33 feet), including 4 males(5 feet) and 21 females(28 feet) with an average age of (47...
March 25, 2018: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29547629/the-exclusive-effects-of-chaperonin-on-the-behavior-of-proteins-with-52-knot
#6
Yani Zhao, Pawel Dabrowski-Tumanski, Szymon Niewieczerzal, Joanna I Sulkowska
The folding of proteins with a complex knot is still an unresolved question. Based on representative members of Ubiquitin C-terminal Hydrolases (UCHs) that contain the 52 knot in the native state, we explain how UCHs are able to unfold and refold in vitro reversibly within the structure-based model. In particular, we identify two, topologically different folding/unfolding pathways and corroborate our results with experiment, recreating the chevron plot. We show that confinement effect of chaperonin or weak crowding greatly facilitates folding, simultaneously slowing down the unfolding process of UCHs, compared with bulk conditions...
March 2018: PLoS Computational Biology
https://www.readbyqxmd.com/read/29532741/short-term-radiographic-outcome-after-distal-chevron-osteotomy-for-hallux-valgus-using-intramedullary-plates-with-an-amended-algorithm-for-the-surgical-management-of-hallux-valgus
#7
Takumi Matsumoto, Christopher E Gross, Selene G Parekh
Distal Chevron osteotomy is a well-established surgical procedure for mild to moderate hallux valgus deformity. Many methods have been described for fixation of osteotomy site; secure fixation, enabling large displacement of the metatarsal head, is one of the essentials of this procedure. The purpose of the present study was to evaluate the short-term radiographic outcome of a distal Chevron osteotomy using an intramedullary plate for the correction of hallux valgus deformity. The present study evaluated 37 patients (40 feet) who underwent distal Chevron osteotomy using an intramedullary plate by periodic radiographs obtained preoperatively and at 4 weeks, 8 weeks, 3 months, and 6 months postoperatively...
March 1, 2018: Foot & Ankle Specialist
https://www.readbyqxmd.com/read/29445839/vocalization-as-a-novel-endpoint-of-atypical-attachment-behavior-in-2-3-7-8-tetrachlorodibenzo-p-dioxin-exposed-infant-mice
#8
Eiki Kimura, Chiharu Tohyama
Mammalian attachment behaviors, such as crying, are essential for infant survival by receiving food, protection, and warmth from caregivers. Ultrasonic vocalization (USV) of infant rodents functions to promote maternal proximity. Impaired USV emission has been reported in mouse models of autism spectrum disorder, suggesting that USV is associated with higher brain function. In utero and lactational dioxin exposure is known to induce higher brain function abnormalities in adulthood; however, whether perinatal dioxin exposure affects behavior during infancy is unclear...
February 14, 2018: Archives of Toxicology
https://www.readbyqxmd.com/read/29425023/optimizing-micromixer-surfaces-to-deter-biofouling
#9
James T Waters, Ya Liu, Like Li, Anna C Balazs
Using computational modeling, we show that the dynamic interplay between a flowing fluid and the appropriately designed surface relief pattern can inhibit the fouling of the substrate. We specifically focus on surfaces that are decorated with three-dimensional (3D) chevron or sawtooth "micromixer" patterns and model the fouling agents (e.g., cells) as spherical microcapsules. The interaction between the imposed shear flow and the chevrons on the surface generates 3D vortices in the system. We pinpoint a range of shear rates where the forces from these vortices can rupture the bonds between the two mobile microcapsules near the surface...
March 7, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29409294/is-generalized-ligamentous-laxity-a-prognostic-factor-for-recurred-hallux-valgus-deformity
#10
Byung-Ki Cho, Ji-Kang Park, Seung-Myung Choi, Nelson F SooHoo
BACKGROUND: This study was performed to evaluate the intermediate-term clinical outcomes after proximal chevron osteotomy for hallux valgus in patients with generalized ligamentous laxity, and to determine the effect on postoperative recurrence of deformity. METHODS: There were 23 cases in laxity group (Beighton score ≥5 points) and 175 in non-laxity group with a mean followup of 46.3 months. Clinical evaluation consisted of the AOFAS score, Foot and Ankle Ability Measure (FAAM), and radiographic measurement of hallux alignment...
October 13, 2017: Foot and Ankle Surgery: Official Journal of the European Society of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/29409293/two-year-outcomes-of-minimally-invasive-hallux-valgus-surgery
#11
Chloe Xiaoyun Chan, Jonathan Zhi-Wei Gan, Hwei Chi Chong, Inderjeet Rikhraj Singh, Sean Yung Chuan Ng, Kevin Koo
BACKGROUND: We report our experience with the Minimally Invasive Chevron Akin (MICA) technique for correcting hallux valgus, and evaluate its effectiveness and associated complications. METHODS: Case series of 13 feet with mild to moderate symptomatic hallux valgus treated surgically from July 2013 to December 2014, with at least 48-months follow-up. Patients were assessed pre-operatively and post-operatively with radiographical measurements (Hallux Valgus Angle (HVA) and Intermetatarsal Angle (IMA)) and clinical scores (American Orthopaedic Foot and Ankle Society (AOFAS), 36-Item Short Form Health Survery (SF-36), Visual Analog Scale (VAS))...
October 13, 2017: Foot and Ankle Surgery: Official Journal of the European Society of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/29409176/minimally-invasive-surgery-for-young-female-patients-with-mild-to-moderate-juvenile-hallux-valgus-deformity
#12
Jun Young Choi, Hee Chan Ahn, Sang Hee Kim, Si Young Lee, Jin Soo Suh
BACKGROUND: We aimed to compare the clinical and radiographic outcomes of minimally invasive surgery (MIS) and distal chevron metatarsal osteotomy (DCMO) for young female patients with mild-to-moderate juvenile hallux valgus deformity. METHODS: We retrospectively reviewed the radiographs and clinical findings of young female patients with mild-to-moderate juvenile hallux valgus who underwent MIS (25 feet) or DCMO (30 feet). In 12 of 25 MIS feet, 2.0-mm bio-absorbable pins were used as an additional fixation device crossing the osteotomy site, and 1...
December 23, 2017: Foot and Ankle Surgery: Official Journal of the European Society of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/29392489/surgical-management-of-renal-cell-carcinoma-with-levels-iii-and-iv-tumor-thrombus-using-the-%C3%A2-flush-%C3%A2-technique
#13
C Chahwan, P A Turcanu, F Alharbi, L Vaudreuil, A L Fiant, K Guleryuz, G Leon, X Tillou, A Doerfler
OBJECTIVE: To determinate feasibility and results of the flush technique by hands for the surgical management of renal cell carcinoma (RCC) with levels III and IV inferior vena cava thrombus (VCT). MATERIALS AND METHODS: We conducted a retrospective study for all patients who underwent a surgical treatment for RCC with levels III and IV VCT in our department between June 2010 and July 2017. Sixteen patients were identified. RESULTS: All tumors were resected using a subcostal incision for right RCC and a chevron incision for the left RCC...
March 2018: International Urology and Nephrology
https://www.readbyqxmd.com/read/29381853/hierarchical-on-surface-synthesis-of-graphene-nanoribbon-heterojunctions
#14
Christopher Bronner, Rebecca A Durr, Daniel J Rizzo, Yea-Lee Lee, Tomas Marangoni, Alin Miksi Kalayjian, Henry Rodriguez, William Zhao, Steven G Louie, Felix R Fischer, Michael F Crommie
Bottom-up graphene nanoribbon (GNR) heterojunctions are nanoscale strips of graphene whose electronic structure abruptly changes across a covalently bonded interface. Their rational design offers opportunities for profound technological advancements enabled by their extraordinary structural and electronic properties. Thus far, the most critical aspect of their synthesis, the control over sequence and position of heterojunctions along the length of a ribbon, has been plagued by randomness in monomer sequences emerging from step-growth copolymerization of distinct monomers...
March 27, 2018: ACS Nano
https://www.readbyqxmd.com/read/29372206/electronic-characterization-of-silicon-intercalated-chevron-graphene-nanoribbons-on-au-111
#15
O Deniz, C Sánchez-Sánchez, R Jaafar, N Kharche, L Liang, V Meunier, X Feng, K Müllen, R Fasel, P Ruffieux
Electronic and thermal properties of chevron-type graphene nanoribbons can be widely tuned, making them interesting candidates for electronic and thermoelectric applications. Here, we use post-growth silicon intercalation to unambiguously access nanoribbons' energy position of their electronic frontier states. These are otherwise obscured by substrate effects when investigated directly on the growth substrate. In agreement with first-principles calculations we find a band gap of 2.4 eV.
February 8, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29338733/effect-of-metatarsal-osteotomy-and-open-lateral-soft-tissue-procedure-on-sesamoid-position-radiological-assessment
#16
Young Rak Choi, Sang-June Lee, Jun Hyun Kim, Tae Ho Kim, Chi Hoon Oh
BACKGROUND: Incomplete sesamoid reduction is a potential risk factor for the recurrence of hallux valgus. The purpose of this study was to radiologically investigate changes in sesamoid position after chevron osteotomy and the open lateral soft tissue procedure. METHODS: Sixty-eight feet that underwent operative correction for hallux valgus deformity were reviewed consecutively. The hallux valgus angle (HVA), first to second intermetatarsal angle (IMA), tibial sesamoid position (TSP), distance of the fibular sesamoid (DFS), and translation of the metatarsal head (TMH) were evaluated preoperatively and at final follow-up...
January 16, 2018: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/29307742/is-double-metatarsal-osteotomy-superior-to-proximal-chevron-osteotomy-in-treatment-of-hallux-valgus-with-increased-distal-metatarsal-articular-angle
#17
Chul Hyun Park, Woo-Chun Lee
We compared the results of proximal chevron osteotomy and double metatarsal osteotomy for hallux valgus with an increased distal metatarsal articular angle (DMAA). From October 2008 to December 2012, first metatarsal osteotomies were performed in 64 patients (69 feet) with symptomatic hallux valgus associated with an increased DMAA. Proximal chevron with Akin osteotomy and lateral soft tissue release was performed in 46 feet (PCO group); double metatarsal osteotomy and Akin osteotomy without lateral soft tissue release was performed in 23 feet (DMO group)...
March 2018: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/29303586/denaturants-alter-the-flux-through-multiple-pathways-in-the-folding-of-pdz-domain
#18
Zhenxing Liu, D Thirumalai
Although we understand many aspects of how small proteins (number of residues less than about hundred) fold, it is a major challenge to quantitatively describe how large proteins self-assemble. To partially overcome this challenge, we performed simulations using the self-organized polymer model with side chains (SOP-SC) in guanidinium chloride (GdmCl), using the molecular transfer model (MTM), to describe the folding of the 110-residue PDZ3 domain. The simulations reproduce the folding thermodynamics accurately including the melting temperature (Tm ), the stability of the folded state with respect to the unfolded state...
February 1, 2018: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29243927/orbitally-matched-edge-doping-in-graphene-nanoribbons
#19
Rebecca A Durr, Danny Haberer, Yea-Lee Lee, Raymond Blackwell, Alin Miksi Kalayjian, Tomas Marangoni, Jisoon Ihm, Steven G Louie, Felix R Fischer
A series of trigonal planar N-, O-, and S-dopant atoms incorporated along the convex protrusion lining the edges of bottom-up synthesized chevron graphene nanoribbons (cGNRs) induce a characteristic shift in the energy of conduction and valence band edge states along with a significant reduction of the band gap of up to 0.3 eV per dopant atom per monomer. A combination of scanning probe spectroscopy and density functional theory calculations reveals that the direction and the magnitude of charge transfer between the dopant atoms and the cGNR backbone are dominated by inductive effects and follow the expected trend in electronegativity...
January 17, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29241361/clinical-and-radiological-outcomes-comparing-percutaneous-chevron-akin-osteotomies-vs-open-scarf-akin-osteotomies-for-hallux-valgus
#20
Mun Chun Lai, Inderjeet Singh Rikhraj, Yew Lok Woo, William Yeo, Yung Chuan Sean Ng, Kevin Koo
BACKGROUND: Minimally invasive surgeries have gained popularity due to less soft tissue trauma and better wound healing. To date, limited studies have compared the outcomes of percutaneous and open osteotomies. This study aims to investigate the clinical and radiological outcomes of percutaneous chevron-Akin osteotomies vs open scarf-Akin osteotomies at 24-month follow-up. METHOD: We reviewed a prospectively collected database in a tertiary hospital hallux valgus registry...
March 2018: Foot & Ankle International
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