27 cm(3) +/- SD 0.65). The anterior volume increase was 0.58 cm(3) while the posterior one was 0.69 cm(3).
Conclusion: In growing subjects RME is able to significantly enlarge the dimension of nasal cavity. The increment is bigger in the lower part of the nose and equally distributed between the anterior e the posterior part of the nasal cavity. (C) 2012 Elsevier Ireland Ltd. All rights reserved.”
“BACKGROUND: Inadequate surface oxidization can potentially destroy the structure and chemical characteristics of the carbon nanotubes (CNTs) and result in loss of sorption capacity and weight. It is necessary to carefully oxidize CNTs
using an adequate NaOCl concentration before using it as a sorbent.
RESULTS: FE-SEM images showed that the structure of CNTs oxidized with 7% NaOCl concentration was significantly destroyed and agglomerated as larger
carbon particles instead selleckchem of nanotubes. The surface acidities of CNTs oxidized HMTase Inhibitor IX with 3% and 5% NaOCl concentration were almost the same, with maximum values 6.20 and 6.25 mmol g(-1), respectively, in all studied cases. Conversely, increasing NaOCl concentration to 7% decreased the acidity from 6.25 to 5.0 mmol g(-1), indicating that 7% NaOCl concentration is not suitable for oxidization of CNTs. Assessing the factors (CNTs mass, contact time, pH, and ionic strength), that influence adsorption performance showed that CNTs oxidized with 5% NaOCl concentration performed better than those with 1%, 3% and 7% concentrations.
CONCLUSION: Considering simultaneously the percentage recovery, adsorption performance and isotherms of CNTs RG7112 inhibitor oxidized by NaOCl solutions at four different concentrations, an optimum NaOCl concentration of 5% is suggested by this study. (C) 2010 Society of Chemical Industry”
“Objective: Congenital tracheal stenosis is a rare but severe
condition with tracheal narrowing. There is no absolute correlation between luminal diameter and prognosis, and therapeutic decisions are difficult for intermediate cases. The aim of this study was to develop a dynamic model of the ventilatory consequences of congenital tracheal stenosis using computational fluid dynamics.
Methods: In 8 children with congenital tracheal stenosis and 1 healthy child, 3-dimensional geometries of the trachea were constructed with computed tomography images and specialized software (ITK-SNAP). Airflow simulations were performed for each geometry using 2 physiologic inhalation flow rates under steady and laminar flow conditions. Flow velocity, static and total airway pressure, and pressure drop across the entire trachea were determined.
Results: In the patients with congenital tracheal stenosis, the pressure drop from the tracheal inlet to outlet, at flow rate 3 L/min, ranged from 14 to 430 Pa; the pressure drop at flow rate 7.3 L/min ranged from 60 to 1825 Pa. The pressure drop enabled a classification based on the severity of stenosis.