Future research may identify subsets of patients who benefit from this strategy. Practitioners Daporinad inhibitor considering this strategy should carefully evaluate each patient’s response to atrial pacing before its implementation.”
“BACKGROUND: Arsenic decontamination of drinking water by adsorption is a simple and robust operation. When designing packed bed adsorbers for arsenic, the main problems are the slow diffusion kinetics of As in microporous media and the lack of simple equations for predicting the performance of the
equipment. Commercial iron-doped granular activated carbon adsorbents (Fe/GAC) for groundwater arsenic abatement were studied in this work. Basic parameters for arsenate (As-V) adsorption were measured and their performance at larger scale was simulated with an approximate analytical model.
RESULTS: In the 0-300 mu g(As) L-1 range, the As-V adsorption isotherm on Fe/GAC was found to be approximately linear. Assuming Henry’s law for adsorption and homogeneous surface diffusion with constant diffusivity for intrapellet mass transfer, an approximate model for flow and adsorption of arsenate inside packed bed adsorbers was developed, and reduced to an I BET 762 analytic compact solution using the quasi-lognormal distribution (Q-LND) approximation. The use of this model with fitted and reported parameters enabled the approximate simulation
of industrial adsorbers and home point-of-use filters. Results show that industrial adsorbers meet the breakthrough condition with incomplete utilization of the adsorbent unless convenient process configurations are used. In point-of-use systems with short residence times intraparticle diffusion would drastically reduce the adsorbent performance.
CONCLUSION: Assuming linear adsorption of As-V over Fe/GAC, an analytical approximate solution for flow and adsorption in packed beds can be obtained. The model seems to represent correctly the main features of
industrial and home filters, however, more experimental data is necessary for scale-up purposes. (C) 2011 Society of Chemical Industry”
“Objective-To compare efficacy, required resources, and perioperative complications between laser AZD1152-HQPA lithotripsy and cystotomy for urolith fie, urocystoliths and urethroliths) removal in dogs.
Design-Retrospective case-control study.
Animals-66 dogs with urolithiasis treated by laser lithotripsy (case dogs) and 66 dogs with urolithiasis treated by cystotomy (control dogs).
Procedures-Medical records were reviewed. Complete urolith removal rate, resources (ie, duration of hospitalization, procedure time, anesthesia time, procedure cost, and anesthesia cost), and complications (ie, hypotension, hypothermia, incomplete urolith removal, and requirement of an ancillary procedure) were compared between cystotomy group dogs and lithotripsy group dogs.