In this letter, the first pillar[6]arene crystal structure and the first investigation of the host-guest chemistry of pillar[6]arenes are reported.”
“The TSI Fast Mobility Particle Sizer (FMPS), Engine Selleckchem MK 2206 Exhaust Particle Sizer (EEPS), and Scanning Mobility Particle Sizer (SMPS) provide size distributions for 6-560 nm particles. The aim of this study was to perform comprehensive equivalence testing of these

three particle sizing instruments with particles of contrasting chemical and physical characteristics (urban ambient, diesel exhaust, and laboratory-generated particulate). It was observed that the EEPS and FMPS measurements agreed to within 15% thus concluding that data from these instruments may be considered equivalent. Parallel measurements with the SMPS showed that when measuring diesel exhaust particulate during ISO8178 Mode 9 operation there is significant overestimation of particle concentrations by both the EEPS and the FMPS in the 20-120 nm size range (25-38% overestimation).

This overestimation also occurred for near-road measurement of heavy emitter vehicle plumes in ambient samples (up to 75% overestimation). selleckchem Laboratory-generated soot agglomerate particles, whose shape was verified by transmission electron microscopy, were also tested. The agglomerate nature of diesel soot particulate buy CX-6258 was the dominant cause of the overestimation; parallel measurements with an FMPS and an Ultrafine Condensation Particle Counter of the laboratory-generated soot particulate showed overestimation by up to a factor of three. (C) 2013 Elsevier Ltd. All rights reserved.”
“Background: Penetrating trauma to the paranasal

sinuses and skull base with retained foreign bodies represents a unique challenge for head and neck surgeons. Management of these injuries is complicated by associated injuries and the proximity to vital neurovascular structures. This study was designed to review the clinical experience with retained sinonasal and skull base projectile foreign bodies at a single academic tertiary care institution.\n\nMethods: A retrospective review of patients who suffered penetrating trauma to the head with retained metallic foreign bodies in the paranasal sinuses and/or skull base between January 2002 and August 2011 was performed at a single academic medical center.\n\nResults: There were 599 patients who suffered penetrating trauma to the head and neck, with 13 patients having retained metallic foreign bodies in the sinuses and/or skull base, mostly bullets or nails. Ten patients underwent urgent (n = 5) or delayed (n = 5) removal of foreign bodies accessible without compromise of adjacent structures either through an endoscopic or open approach. Three patients had multiple foreign bodies that were not removed.