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https://www.readbyqxmd.com/read/29606549/a-randomized-comparison-of-the-proximal-crescentic-osteotomy-and-rotational-scarf-osteotomy-in-the-treatment-of-hallux-valgus
#1
Namık Şahin, Gökhan Cansabuncu, Nazan Çevik, Oğuz Türker, Güven Özkaya, Yüksel Özkan
OBJECTIVES: The aim of this study was to compare clinical and radiological results of proximal crescentic osteotomy (PCO) and rotational scarf osteotomy performed in the treatment of hallux valgus. METHODS: A total of 57 consecutive patients (60 feet) with symptomatic hallux valgus deformity were randomly assigned to one of two groups. The PCO group consisted of 22 women and 5 men (30 feet) and the mean age was 43(±14.5) years. The scarf group consisted of 23 women and 7 men (30 feet) and the mean age was 40...
March 30, 2018: Acta Orthopaedica et Traumatologica Turcica
https://www.readbyqxmd.com/read/29600579/synthesis-and-bioactivity-of-polymer-based-synthetic-mimics-of-antimicrobial-peptides-smamps-made-from-asymmetrically-disubstituted-itaconates
#2
David Boschert, Alexandra Schneider-Chaabane, Andreas Himmelsbach, Alice Eickenscheidt, Karen Lienkamp
A series of asymmetrically disubstituted diitaconate monomers is presented. Starting from itaconic anhydride, functional groups could be placed selectively at the two non-equivalent carbonyl groups. Using 2D NMR, it was shown that the first functionalization step occurred at the carbonyl in -position to the double bond. These monomers were copolymerized with dimethylacrylamide (DMAA) to yield polymer-based synthetic mimics of antimicrobial peptides (SMAMPs). They were obtained by free radical polymerization, a metal free process, and still maintained the facial amphiphilicity at the repeat unit level...
March 30, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29565078/cation-induced-folding-of-alginate-bearing-bilayer-gels-an-unusual-example-of-spontaneous-folding-along-the-long-axis
#3
Jasmin C Athas, Catherine P Nguyen, Shailaa Kummar, Srinivasa R Raghavan
The spontaneous folding of flat gel films into tubes is an interesting example of self-assembly. Typically, a rectangular film folds along its short axis when forming a tube; folding along the long axis has been seen only in rare instances when the film is constrained. Here, we report a case where the same free-swelling gel film folds along either its long or short axis depending on the concentration of a solute. Our gels are sandwiches (bilayers) of two layers: a passive layer of cross-linked N,N'-dimethylyacrylamide (DMAA) and an active layer of cross-linked DMAA that also contains chains of the biopolymer alginate...
March 22, 2018: Soft Matter
https://www.readbyqxmd.com/read/29513348/super-strong-dopamine-hydrogels-with-shape-memory-and-bioinspired-actuating-behaviours-modulated-by-solvent-exchange
#4
Jiahe Huang, Jiexin Liao, Tao Wang, Weixiang Sun, Zhen Tong
Dopamine-containing hydrogels were synthesized by copolymerization of dopamine methacrylamide (DMA), N,N-dimethylacrylamide (DMAA), and an N,N'-methylenebisacrylamide (BIS) crosslinker in a mixed solvent of water and DMSO. The association of DMA was formed by simply immersing in water to facilely reinforce the hydrogel due to the introduction of the second physical crosslinking. The tensile strength of the hydrogels was increased greatly and regulated in a wide range from 200 kPa to over 2 MPa. The association of DMA was destroyed upon immersing in DMSO...
March 7, 2018: Soft Matter
https://www.readbyqxmd.com/read/29505707/biovolatilization-of-arsenic-as-arsines-from-seawater
#5
Laurie Savage, Manus Patrick Carey, Paul Nicholas Williams, Andrew A Meharg
Marine sources of arsenic to the atmosphere are normally dismissed as minor. Here we show that arsenic can be biovolatilized from coastal seawaters, and that biovolatilzation is regulated by organic arsenic species present in the seawater. Even though inorganic arsenic is in great excess in seawaters, it is trimethylarsine (TMA) that is the primary biovolatilized product, with dimethylarsine (DMA) also observed if dimethylarsinic acid (DMAA) is spiked into seawaters. With respect to budgets, 0.04% of the total arsenic in early autumn, Irish Sea, sea-lough collected seawater was biovolatilized over a 2-week incubation period...
March 5, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29409298/use-of-a-percutaneous-osteotomy-with-plate-fixation-in-hallux-valgus-correction
#6
Rodrigo Díaz Fernández
BACKGROUND: With hundreds of operative methods described for correction of hallux valgus we can state that the ideal surgical treatment is still controversial. The Bösch technique has been used as a percutaneous way of correcting hallux valgus deformities with the use of a pin fixation. The aim of this study is to evaluate a new method of fixation by using a percutaneous locking plate. METHODS: Between June 2013 and January 2015, 24 consecutive percutaneous subcapital osteotomies of the first metatarsal bone were performed for the treatment of painful hallux valgus deformities in 24 patients...
September 20, 2017: Foot and Ankle Surgery: Official Journal of the European Society of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/29320937/radiographic-measurements-associated-with-the-natural-progression-of-the-hallux-valgus-during-at-least-2-years-of-follow-up
#7
Seung Yeol Lee, Chin Youb Chung, Moon Seok Park, Ki Hyuk Sung, Sonya Ahmed, Seungbum Koo, Dong-Wan Kang, Kyoung Min Lee
BACKGROUND: This study aimed to investigate the radiographic measurements associated with the progression of hallux valgus during at least 2 years of follow-up. METHODS: Seventy adult patients with hallux valgus who were followed for at least 2 years and underwent weightbearing foot radiography were included. Radiographic measurements included the hallux valgus angle (HVA), hallux interphalangeal angle, intermetatarsal angle (IMA), metatarsus adductus angle, distal metatarsal articular angle (DMAA), tibial sesamoid position, anteroposterior (AP) talo-first metatarsal angle, and lateral talo-first metatarsal angle...
April 2018: Foot & Ankle International
https://www.readbyqxmd.com/read/29151367/surveillance-of-the-armed-forces-as-a-sentinel-system-for-detecting-adverse-effects-of-dietary-supplements-in-the-general-population
#8
Harris R Lieberman, Krista G Austin, Emily K Farina
OBJECTIVE: Half the US population takes dietary supplements, but surveillance systems available to regulatory and public health authorities to determine whether specific dietary supplements present a risk are inadequate and numerous severe injuries and deaths have occurred from their consumption. Uniformed military personnel regularly use dietary supplements and are more likely to use potentially dangerous supplements than civilians. Recently, the supplement 1,3-dimethylamylamine (DMAA) was marketed for physical performance-enhancement and weight loss...
November 20, 2017: Public Health Nutrition
https://www.readbyqxmd.com/read/29115866/four-experimental-stimulants-found-in-sports-and-weight-loss-supplements-2-amino-6-methylheptane-octodrine-1-4-dimethylamylamine-1-4-dmaa-1-3-dimethylamylamine-1-3-dmaa-and-1-3-dimethylbutylamine-1-3-dmba
#9
Pieter A Cohen, John C Travis, Peter H J Keizers, Patricia Deuster, Bastiaan J Venhuis
BACKGROUND: The United States Food and Drug Administration banned the stimulant 1,3-dimethylamylamine (1,3-DMAA) from dietary supplements and warned consumers that the stimulant can pose cardiovascular risks ranging from high blood pressure to heart attacks. OBJECTIVES: We designed our study to determine if a new stimulant similar in structure to 1,3-DMAA has been introduced as an ingredient in supplements sold in the United States (US). METHODS: We analyzed six brands of supplements that listed an ingredient on the label (e...
November 8, 2017: Clinical Toxicology
https://www.readbyqxmd.com/read/29051444/the-investigation-of-unexpected-arsenic-compounds-observed-in-routine-biological-monitoring-urinary-speciation-analysis
#10
Elizabeth Leese, Malcolm Clench, Jackie Morton, Philip H E Gardiner, Vikki A Carolan
This study investigates the identity of two unexpected arsenic species found separately in a number of urine samples sent to the Health and Safety Executive's Health and Safety Laboratory for arsenic speciation (arsenobetaine, AB; arsenite, As3+ ; arsenate, As5+ ; monomethylarsonic acid, MMA5+ ; and dimethylarsinic acid, DMA5+ ). Micro liquid chromatography coupled to inductively coupled plasma mass spectrometry (µLC-ICP-MS) and electrospray time of flight tandem mass spectrometry (ESI-QqTOF-MS/MS) were used to identify the two arsenic peaks by comparison to several characterized arsenicals: arsenocholine, AC; trimethyl arsine oxide, TMAO; dimethylarsenoacetate, DMAA; dimethylarsenoethanol, DMAE; thio-dimethylarsinate, thio-DMA; thio-dimethylarsenoacetate, thio-DMAA and thio-dimethylarsenoethanol, thio-DMAE...
May 20, 2017: Toxics
https://www.readbyqxmd.com/read/28977751/elevated-trimethylarsine-oxide-and-inorganic-arsenic-in-northern-hemisphere-summer-monsoonal-wet-deposition
#11
Laurie Savage, Manus Carey, Mahmud Hossain, M Rafiqul Islam, P Mangala C S de Silva, Paul N Williams, Andrew A Meharg
For arsenic speciation, the inputs for wet deposition are not well understood. Here we demonstrate that trimethylarsine oxide (TMAO) and inorganic arsenic are the dominant species in monsoonal wet deposition in the summer Indian subcontinent, Bangladesh, with inorganic arsenic dominating, accounting for ∼80% of total arsenic in this medium. Lower concentrations of both species were found in monsoonal wet deposition in the winter Indian subcontinent, Sri Lanka. The only other species present was dimethylarsinic acid (DMAA), but this was usually below limits of detection (LoD)...
November 7, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28914993/hyaluronan-incorporation-into-model-contact-lens-hydrogels-as-a-built-in-lubricant-effect-of-hydrogel-composition-and-proteoglycan-4-as-a-lubricant-in-solution
#12
Michael Samsom, Myrto Korogiannaki, Lakshman N Subbaraman, Heather Sheardown, Tannin A Schmidt
Contact lens friction significantly correlates with subjective comfort. Hyaluronan (HA) and proteoglycan 4 (PRG4) are natural boundary lubricants present in the body. The objective of this study was to assess the effect of crosslinked HA into the bulk of model contact lens materials pHEMA, pHEMA/TRIS, and DMAA/TRIS on surface wettability, protein sorption, and boundary lubricating properties at a material-cornea biointerface, both alone and synergistically with PRG4 in solution. Surface wettability was assessed by water contact angle measurement, protein sorption by lysozyme sorption assay, and boundary lubricating properties using an in vitro friction test method...
September 15, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28796505/toolbox-of-nonmetallocene-lanthanides-multifunctional-catalysts-in-group-transfer-polymerization
#13
Friederike Adams, Martin R Machat, Peter T Altenbuchner, Johannes Ehrmaier, Alexander Pöthig, Tolga N V Karsili, Bernhard Rieger
Herein, we present a fundamental study of isostructural 2-methoxyethylamino-bis(phenolate)-lanthanide complexes [(ONOO)R M(X)(THF)] (M = Lu, Y; R =t Bu, CMe2 Ph, X = CH2 TMS, collidine; THF = tetrahydrofuran; TMS = trimethylsilyl) for rare-earth metal-mediated group-transfer polymerization (GTP). This analysis includes the differentiation of electron-donating and nondonating vinyl monomers and two metal centers with regard to the ionic radius (yttrium and lutetium). In addition, highly nucleophilic alkyl initiators are compared with electron-donating heteroaromatic initiators...
August 21, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28688149/proteoglycan-4-and-hyaluronan-as-boundary-lubricants-for-model-contact-lens-hydrogels
#14
Michael Samsom, Yuno Iwabuchi, Heather Sheardown, Tannin A Schmidt
Clinical data show that in vitro contact lens friction is related to in vivo comfort. Solutions of biological lubricants hyaluronan (HA) and proteoglycan 4 (PRG4, also known as lubricin) reduce friction at a cornea-polydimethylsiloxane (PDMS) interface. The purpose of this study was to (1) determine if PRG4 can sorb to and lubricate model contact lens materials and (2) assess the boundary lubricating ability of PRG4 and HA compared to saline on model contact lens materials. PRG4 was obtained from bovine cartilage culture and suspended in saline at 300 µg/mL...
July 7, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28634348/distinct-arsenic-metabolites-following-seaweed-consumption-in-humans
#15
Vivien F Taylor, Zhigang Li, Vicki Sayarath, Thomas J Palys, Kevin R Morse, Rachel A Scholz-Bright, Margaret R Karagas
Seaweeds contain arsenic primarily in the form of arsenosugars, which can be metabolized to a wide range of arsenic compounds. To characterize human exposure to arsenic from seaweed consumption, we determined concentrations of arsenic species in locally available seaweeds, and assessed urinary arsenic compounds in an experimental feeding study. A total of 11 volunteers consumed 10 g per day of three types of seaweeds (nori, kombu, and wakame) for three days each, while abstaining from rice and seafood following a three-day washout period...
June 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28578108/an-interpenetrating-microstructurable-and-covalently-attached-conducting-polymer-hydrogel-for-neural-interfaces
#16
Carolin Kleber, Michael Bruns, Karen Lienkamp, Jürgen Rühe, Maria Asplund
This study presents a new conducting polymer hydrogel (CPH) system, consisting of the synthetic hydrogel P(DMAA-co-5%MABP-co-2,5%SSNa) and the conducting polymer (CP) poly(3,4-ethylenedioxythiophene) (PEDOT), intended as coating material for neural interfaces. The composite material can be covalently attached to the surface electrode, can be patterned by a photolithographic process to influence selected electrode sites only and forms an interpenetrating network. The hybrid material was characterized using cyclic voltammetry (CV), impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS), which confirmed a homogeneous distribution of PEDOT throughout all CPH layers...
May 31, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28415465/photochemical-coating-of-kapton%C3%A2-with-hydrophilic-polymers-for-the-improvement-of-neural-implants
#17
Christoph Hadler, Kirsten Wissel, Gudrun Brandes, Wibke Dempwolf, Günter Reuter, Thomas Lenarz, Henning Menzel
The polyimide Kapton® was coated photochemically with hydrophilic polymers to prevent undesirable cell growth on the polyimide surface. The polymer coatings were generated using photochemically reactive polymers synthesized by a simple and modular strategy. Suitable polymers or previously synthesized copolymer precursors were functionalized with photoactive arylazide groups by a polymer analogous amide coupling reaction with 4-azidobenzoic acid. A photoactive chitosan derivative (chitosan-Az) and photochemically reactive copolymers containing DMAA, DEAA or MTA as primary monomers were synthesized using this method...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28405710/-distal-osteotomy-for-the-treatment-of-hallux-valgus-chevron-osteotomy
#18
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...
May 2017: Der Orthopäde
https://www.readbyqxmd.com/read/28391704/effect-of-bipartite-hallucal-sesamoid-on-hallux-valgus-surgery
#19
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...
June 2017: Foot & Ankle International
https://www.readbyqxmd.com/read/28283444/comparison-between-simple-radiographic-and-computed-tomographic-three-dimensional-reconstruction-for-evaluation-of-the-distal-metatarsal-articular-angle
#20
Eduardo Pedrini Cruz, Felipe Victora Wagner, Carlo Henning, José Antônio Veiga Sanhudo, Fernando Pagnussato, Carlos Roberto Galia
The hallux valgus is a pathologic condition in the forefoot that often causes pain and functional limitations. Assessing all deformity components, such as the distal metatarsal articular angle (DMAA) is essential to hallux valgus treatment. Nevertheless, interobserver agreement of DMAA is poor on plain radiographs. The present study compared computed tomographic (CT) 3-dimensional (3D) reconstruction with plain radiographic measurements for measuring the DMAA. We included 43 consecutive patients (77 feet), diagnosed with hallux valgus at the orthopedic outpatient clinic at Hospital de Clínicas de Porto Alegre (Porto Alegre, Brazil) from April 2014 to June 2015 in our prospective study...
March 7, 2017: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
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