Hemobilia due to cystic artery pseudoaneurysm: A rare late complication of laparoscopic cholecystectomy

We discuss a patient with late presentation of hemobilia following cholecystectomy, which is unusual because pseudoaneurysm caused by vascular injury during surgery typically presents soon after surgery. Endoscopic retrograde cholangiopancreatography revealed a large blood clot arising from the biliary orifice with subsequent computed tomography angiography diagnosing a large pseudoaneurysm in the region of the cystic artery adjacent to the cholecystectomy clips. Embolization was performed via direct percutaneous puncture of the pseudoaneurysm

An on-line solid phase extraction procedure for the routine quantification of urinary methylmalonic acid by liquid chromatography-tandem mass spectrometry

Background: The goal of this study was to develop and to validate an improved isotope-dilution-liquid chromatography-tandem mass spectrometry (LC-MS/MS) method for the quantification of methylmalonic acid (MMA) in urine. Methods: A previously described sample preparation protocol requires two solvent extraction steps, including evaporation. The first extraction is to extract the analyte from the sample, and second occurs following derivatization of the extract. In the method described here, the second evaporation step was substituted by on-line solid phase extraction employing column-switching and a permanent co-polymer based extraction cartridge. A standard validation protocol was applied to investigate the performance of the method. Results: The method was found to be linear in the clinically relevant range of concentrations (6-100 mu mol/L). Total coefficients of variation were below 10% and inaccuracy was <10% for quality control samples at three concentrations. Conclusions: By omitting one evaporation step, the semi-automated method described in this article enables for more convenient work-flow in the quantification of urinary MMA compared to the previous protocol. This is of relevance for MMA measurement in the routine clinical laboratory setting. Validation demonstrated acceptable analytical performance. Clin Chem Lab Med 2010;48:1647-50

Nonlinear Dynamics of Composite Plates and Shells

The equations of refined geometrically nonlinear theory of dynamic deformation of flexible with respect to transversal shear and compression ofplates and shells are proposed. The solutions for problems of transversal nonlinear vibrations of hinge fixedplate-strip are obtained. Numerical results are compared with the known in literature

Descripción matemática de la electropolimerización de monómeros modificados electroquímicamente

En este trabajo se presenta y analiza (por medio de la teoríade estabilidad lineal y del análisis de bifurcaciones) el modelo matemático de la síntesis electroquímica de polímeros, basados en monómeros, derivados electroquímicamente. Las posibles inestabilidades electroquímicas (oscilaciones, instabilidad monotónica), así como las condiciones de estabilidad del estado estacionario, se explican bajo las condiciones del modelo presentado. El modelo del caso más simple sirve como base para los modelos de los casos más complicados

Барботажное активирование растворов и роль этого явления в природных и технологических процессах

Розглянуті можливі молекулярні механізми структурування води та міжфазної поверхні газ/вода у розчинах. Показано, що барботажна активація (БА) відбувається шляхом підвищення структурної температури води і веде до підвищення хімічної активності молекул Н2О та розчиненого кисню. Встановлено, що БА має квазірівноважний характер. Тому при зовнішніх впливах на лініях змін рН і Eh появляються характерні піки або сходинки, які можна використовувати для дослідження взаємодії розчинів з різними твердими матеріалами. Запропонована модель структурних перетворень, яка може пояснити, чому негативно заряджені бульбашки газів утворюють позитивно заряджені краплинки морських аерозолів.The possible molecular mechanisms of water structuring and between the surfaces of gas/water in the solutions are considered. It was shown that barbotage activation (BA) occurs by increasing the structural temperature of water and causes increasing of chemical activity of H2O and dissolved oxygen. It is established that BA has quasi equilibrium character. Therefore external influences on the lines of changes of pH and Eh characteristic peaks or steps appear that can be used to investigate the interaction of solutions with different solid materials. The proposed model of structural transformation may explain why negatively charged bubbles of gas form positively charged droplets of sea spray.Рассмотрены возможные молекулярные механизмы структурирования воды и междуфазной поверхности газ/вода в растворах. Показано, что барботажная активация (БА) происходит путем повышения структурной температуры воды и ведет к повышению химической активности молекул Н2О и растворимого кислорода. Установлено, что БА имеет квазиравновесный характер. Поэтому при внешних воздействиях на линиях изменений рН и Eh появляются характерные пики или ступеньки, которые можно использовать для исследования взаимодействия растворов с различными твердыми материалами. Предложена модель структурных преобразований, которая может объяснить, почему отрицательно заряженные пузырьки газов образуют положительно заряженные капельки морских аэрозолей

A first estimate of radio halo statistics from large-scale cosmological simulation

We present a first estimate based on a cosmological gasdynamics simulation of galaxy cluster radio halo counts to be expected in forthcoming low-frequency radio surveys. Our estimate is based on a FLASH simulation of the LCDM model for which we have assigned radio power to clusters via a model that relates radio emissivity to cluster magnetic field strength, intracluster turbulence, and density. We vary several free parameters of this model and find that radio halo number counts vary by up to a factor of two for average magnetic fields ranging from 0.2 to 3.1 uG. However, we predict significantly fewer low-frequency radio halos than expected from previous semi-analytic estimates, although this discrepancy could be explained by frequency-dependent radio halo probabilities as predicted in reacceleration models. We find that upcoming surveys will have difficulty in distinguishing models because of large uncertainties and low number counts. Additionally, according to our modeling we find that expected number counts can be degenerate with both reacceleration and hadronic secondary models of cosmic ray generation. We find that relations between radio power and mass and X-ray luminosity may be used to distinguish models, and by building mock radio sky maps we demonstrate that surveys such as LOFAR may have sufficient resolution and sensitivity to break this model degeneracy by imaging many individual clusters.Comment: 18 pages, 14 figures, revised from referee comments, ApJ accepted, public catalog available at http://sipapu.astro.illinois.edu/http://sipapu.astro.illinois.edu/foswiki/bin/view/Main/RadioHaloMap