Triptycene-based organic molecules of intrinsic microporosity

Four Organic Molecules of Intrinsic Microporosity (OMIMs) were prepared by fusing triptycene-based components to a biphenyl core. Due to their rigid molecular structures that cannot pack space efficiently, these OMIMs form amorphous materials with significant microporosity as demonstrated by apparent BET surface areas in the range of 515–702 m2 g–1. Bulky cyclic 1′,2′,3′,4′-tetrahydro-1′,1′,4′,4′-tetramethylbenzo units placed on the triptycene termini are especially efficient at enhancing microporosity

Comparison of generic force fields for packing of concave molecules

<div><p></p><p></p><p></p><p>Organic molecules of intrinsic microporosity (OMIMs) are a new class of highly concave molecules, designed to pack inefficiently and create microporous materials. In this work, OMIM-1 was described with full atomistic models using Dreiding, optimised potentials for liquid simulations (OPLS) and Universal force fields to recognise the features enhanced by each force field and assess their ability in representing the structural properties of this new class of materials. In addition, argon adsorption isotherms were modelled to determine the features observed in the isotherm generated by each force field, for future comparison with experimental data.</p></div

The Management of Diaphyseal Long Bone Fractures with lntramedullary Expandable Nails

Four years elapsed since the treatment of long bone fractures with Fixion intramedullary self locking nails had been proposed. The aim of this prospective study was to evaluate on a 2 year; follow up the efficacy of diaphyseal fracture's treatment using the Fixion nail. A consecutive series of 102 acute diaphyseal fractured patients operated on with the expandable nailing system, fulfilling indusion and exclusion criteria, were selected. No reaming or interlocking screws had been used. Eighty-two (41 tibial, 25 femoral and 16 humeral fractured) out of 102 patients with a mean age of 46.2 years (15-72) were undertaken over a 24 months follow up (80.3 percent of response rate). Radiological examinations were performed 30 and 50 days after surgery and every 40 days until consolidation occurred. Roentgenographic success criterion was bridging of all four cortices in the anteroposterior and lateral radiographic views. Clinical outcome was evaluated according the Musculoskeletal Function Assessment. Bony healing with fragment alignment and exact length of bone was achieved in the 95 percent of fractures with a mean consolidation time of 9,7 weeks. Two cases of hardware failure were observed, 2 oligoatrophic pseudoarthroses occurred. No infections were reported. Seventy-six patients returned to their previous occupation, 5 patients had to change office due to residual disturbances; one patient was out of work. Results achieved let us to consider the Fixion" system an effective minimally invasive procedure for long bone diaphyseal fracture both considering the high success rate and the reduced exposure and time of surgery

A modified Austin/chevron osteotomy for treatment of hallux valgus and hallux rigidus

Abstract: The purpose of this brief paper is to present the preliminary results of a modified Austin/chevron osteotomy for treatment of hallux valgus and hallux rigidus. In this procedure, the dorsal arm of the osteotomy is performed orthogonal to the horizontal plane of the first metatarsal, the main advantage being that this allows much easier and more accurate multiplanar correction of first metatarsal deformities. From 2010 to 2013, 184 consecutive patients with symptomatic hallux valgus and 48 patients with hallux rigidus without severe metatarsophalangeal joint degeneration underwent such modified chevron osteotomy. Mean patient age was 54.9 (range 21–70) years, and mean follow-up duration was 41.7 (range 24–56) months. Ninety-three percent of patients were satisfied with the surgery. Mean American Orthopaedic Foot and Ankle Society (AOFAS) score improved from 56.6 preoperatively to 90.6 at last follow-up, and mean visual analog scale (VAS) pain score decreased from 5.7 preoperatively to 1.6 at final follow-up (p < 0.05). In patients treated for hallux valgus, mean hallux valgus angle decreased from 34.1° preoperatively to 6.2° at final follow-up, and mean intermetatarsal angle decreased from 18.5° preoperatively to 4.1° at final follow-up (p < 0.05). One patient developed postoperative transfer metatarsalgia, treated successfully with second-time percutaneous osteotomy of the minor metatarsals, whilst one patient had wound infection that resolved with systemic antibiotics. Level of evidence: Level IV.The purpose of this brief paper is to present the preliminary results of a modified Austin/chevron osteotomy for treatment of hallux valgus and hallux rigidus. In this procedure, the dorsal arm of the osteotomy is performed orthogonal to the horizontal plane of the first metatarsal, the main advantage being that this allows much easier and more accurate multiplanar correction of first metatarsal deformities. From 2010 to 2013, 184 consecutive patients with symptomatic hallux valgus and 48 patients with hallux rigidus without severe metatarsophalangeal joint degeneration underwent such modified chevron osteotomy. Mean patient age was 54.9 (range 21-70) years, and mean follow-up duration was 41.7 (range 24-56) months. Ninety-three percent of patients were satisfied with the surgery. Mean American Orthopaedic Foot and Ankle Society (AOFAS) score improved from 56.6 preoperatively to 90.6 at last follow-up, and mean visual analog scale (VAS) pain score decreased from 5.7 preoperatively to 1.6 at final follow-up (p < 0.05). In patients treated for hallux valgus, mean hallux valgus angle decreased from 34.1A degrees preoperatively to 6.2A degrees at final follow-up, and mean intermetatarsal angle decreased from 18.5A degrees preoperatively to 4.1A degrees at final follow-up (p < 0.05). One patient developed postoperative transfer metatarsalgia, treated successfully with second-time percutaneous osteotomy of the minor metatarsals, whilst one patient had wound infection that resolved with systemic antibiotics.Level IV