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Clinical Presentation And Genotype Of Hepatitis Delta In Karachi, Tariq Moatter, Zaigham Abbas, Sabhita Shabir, Wasim Jafri

Department of Pathology and Laboratory Medicine

Aim:
To assess the clinical presentation and genotypes of delta hepatitis in local population.
Methods:
In this prospective study, 39 consecutive patients who were positive for HBsAg and hepatitis D virus (HDV) antibody were included. The patients were divided in two groups on the basis of presence or absence of HDV RNA and a comparative study was done. Genotype of HDV was determined in PCR positive patients.
Results:
Overall there is male dominance, in which 34 patients out of 39 (87.2%) were male. Twenty (51%) patients were from the adjacent areas of three provinces; Sindh, Punjab and Balochistan indicating the …

Learning How To Make Inquiry Into Electricity And Magnetism Discernible To Middle Level Teachers , Gayle A. Buck, Margaret A. Macintyre Latta, Diandra Leslie-Pelecky

Department of Teaching, Learning, and Teacher Education: Faculty Publications

As university professors we sought to disrupt the practice of giving our students the actions we felt they should imitate in their teaching practice. Instead, we sought to actively engage teachers in the creation of workable solutions to real-life problems. We accomplished this by conducting a participatory action research project. This paper illustrates our action research project focused on preparing middle level science teachers to foster inquiry-based learning in their classrooms. The findings of this study not only lead to a revised professional development opportunity for science teachers, but also provided an example of university faculty engaging in pragmatic research …

The Pseudomonas Aeruginosa Secreted Protein Pa2934 Decreases Apical Membrane Expression Of The Cystic Fibrosis Transmembrane Conductance Regulator, Daniel P. Maceachran, Siying Ye, Jennifer M. Bomberger, Deborah A. Hogan, Agnieszka Swiatecka-Urban, Bruce Stanton, George A. O'Toole

Dartmouth Scholarship

We previously reported that Pseudomonas aeruginosa PA14 secretes a protein that can reduce the apical membrane expression of the cystic fibrosis transmembrane conductance regulator (CFTR) protein. Here we report that we have used a proteomic approach to identify this secreted protein as PA2934 [corrected], and we have named the gene cif, for CFTR inhibitory factor. We demonstrate that Cif is a secreted protein and is found associated with outer membrane-derived vesicles. Expression of Cif in Escherichia coli and purification of the C-terminal six-His-tagged Cif protein showed that Cif is necessary and sufficient to mediate the reduction in apical membrane expression …

The Colby Echo (2007-05-14), Colby College

The Colby Echo

Published by the students of Colby College since 1877, The Colby Echo is the weekly, editorially independent student-run newspaper of Colby College in Waterville, Maine. Published monthly, 1877-1886; semi-monthly, 1886-1897; and weekly, during the academic year, 1898-present.

Ubiquitination Of Serine, Threonine, Or Lysine Residues On The Cytoplasmic Tail Can Induce Erad Of Mhc-I By Viral E3 Ligase Mk3, Xiaoli Wang, Roger A. Herr, Wei-Jen Chua, Lonnie Lybarger, Emmanuel J.H.J. Wiertz, Ted H. Hansen

Open Access Publications

No abstract provided.

Faculty Newsnotes 2007 No. 398, Office Of The Provost

Faculty Newsnotes (1972-2010)

No abstract provided.

Newsroom, Georgia Southern University

Newsroom (2006-2023)

• NCATE continues accreditation of teacher preparation at Georgia Southern
• Geisler receives $135,000 grant for study of evolution of dolphins and porpoises

Radial Distribution Of Local Concentration Weighted Particle Velocities In High Density Circulating Fluidized Beds, Gorkem Kirbas, Sung Won Kim, Xiaotao Bi, Jim Lim, John R. Grace

The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering

An extensive experimental investigation of radial profiles of concentration -weighted particle velocities was carried out by simultaneously measuring local transient particle velocity, solids concentration and solids flux using a three-fibre optical probe at five axial levels and seven radial locations in a 0.2 m diameter riser operating over a wide range of solids circulation fluxes (198 to 350 kg/m 2s) and superficial gas velocities (6 to 8 m/s). Particle velocities averaged over time and concentration-weighted particle velocities were compared and found to differ from each other, the latter being smaller than the former at most radial locations. The difference, which …

Effect Of Particle Size Distribution On The Performance Of A Catalytic Fluidized Bed Reactor, Sanjib Das Sharma, Todd S. Pugsley

The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering

Computational Fluid Dynamics (CFD) has been used to model ozone decomposition in a two-dimensional fluidized bed of 2.0 meters height and 0.1 m width. Simulations were carried out with mono-size, bimodal, and wide catalyst particle size distributions with the same mean diameter to model the effect of fines on the reaction. CFD predictions fall within 20% of the experimental data.

Treatment Of Voc Emissions In A Gas-Solid Fluidized Bioreactor, Kyla Clarke, Gordon A. Hill, Todd S. Pugsley

The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering

A fluidized bioreactor, with a bed of moist sawdust and glass spheres, successfully treated ethanol-contaminated air. The maximum elimination capacity was 75 g m-3sawdust h-1 for the fluidized bed compared to 225 g m-3sawdust h-1 for a packed bed (essentially a biofilter).

Fluidized Bed Polymer Particle Ald Process For Producing Hdpe/Alumina Nanocomposites, Joseph A. Spencer, Xinhua Liang, Steven M. George, Karen J. Buechler, John Blackson, Charles J. Wood, John R. Dorgan, Alan W. Weimer

The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering

Micron-sized High Density Polyethylene (HDPE) particles were coated with ultrathin alumina (Al2O3) films in a Fluidized Bed Reactor (FBR) by Atomic Layer Deposition (ALD) at 77 ºC. Al2O3 films on the HDPE particles were confirmed by different methods. These particles were extruded conventionally with the ceramic shells mixing intimately in the polymer matrix. The successful dispersion of the Al2O3 shells in the polymer matrix following extrusion was confirmed using cross sectional Transmission Electron Microscopy (TEM).

Modeling Of An Interconnected Fluidized Bed Reactor For Chemical Looping Combustion, Min Xu, Naoko Ellis, Ho-Jung Ryu , C. Jim Lim

The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering

Chemical Looping Combustion (CLC) is comprised of two reactors, in which direct contact between air and fuel is avoided. A metal oxide, as oxygen carrier, transports oxygen from the air reactor to the fuel reactor while circulating between them. Based on the hydrodynamics coupled with reaction kinetics of oxygen carrier from the literature, a model for an interconnected fluidized bed reactor has been developed to optimize the design and operation of the reactor system. The model considers the chemical reaction of a single particle and a particle population balance for the calculation of bed particle conversion. The core-annulus and two-phase …

Cold Modelling Of An Internally Circulating Fluidized Bed Membrane Reactor, Tony Boyd, John R. Grace, C. Jim Lim, A. M. Adris

The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering

A novel fluidized bed membrane reactor with internal catalyst circulation is being developed for the production of high-purity H2 from an autothermal reformer. In order to provide guidance to pilot reactor testing, a cold model was built to study the influence of reactor configuration on hydrodynamics and catalyst circulation. It was found that catalyst circulation was reproducible, but that parallel non-communicating flow channels could lead to flow instability. Solids circulation was found to be adequate for design of the autothermal reformer.

Thermal Conversion Of Biomass And Waste, Liban Yassin, Paola Lettieri, Stefaan Simons, Antonino Germanà

The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering

This paper investigates the process designs of 2 fluidized bed gasification plants utilizing clean biomass. Energy and mass balances for each process were carried out and ChemCAD was used to evaluate the energy recovery process by simulating the operation of a steam turbine and a combined cycle gas turbine (CCGT).

Hydrodynamic And Rtd Of Sectionalized Bubble Column, Nahidh W. Mecaial, Burhan Sadik

The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering

The sectionalization of conventional bubble columns to tray partitioned bubble column using perforated trays has been used to investigate the effect of tray hole diameter, tray open area, superficial gas velocity, gas sparger design, and liquid phase properties on gas holdup, residence time distribution (RTD), and overall liquid-phase backmixing. The erected column is sectionalized into three stages using two perforated plates of different holes diameter and open free area. Overall gas holdup is measured experimentally by bed expansion technique. Liquid backmixing, mixing time and axial dispersion model (ADM) is determined using tracer response experiments. In general, it seems that the …

Role Of Intrinsic Kinetics And Catalyst Particle Size Distribution In Cfd Simulations Of Polymerization Reactors, Rong Fan, Rodney O. Fox, Michael E. Muhle

The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering

Fluidized-bed reactors are widely used in the production of polyethylene. In this work, the quadrature method of moments (QMOM), a chemical reaction engineering (CRE) model, and computational fluid dynamics (CFD) are combined to investigate the role of intrinsic kinetics and the catalyst particle size distribution (PSD) in a gas phase fluidized bed reactor. The catalyst PSD is represented by a few nodes using the QMOM and an intrinsic rate model based on the age of particles is used to solve the evolution of particle temperature, particle size, and catalyst sites with age. Assuming the particle age distribution is well-mixed, the …

Volume Contraction In Liquid Fluidization Of Binary Solids Mixtures, Norman Epstein , R. Escudié, John R. Grace, Xiaotao T. Bi

The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering

When liquid-fluidized particles of radically different sizes and densities mix, the serial (additive volume) model fails to predict the fluidized bed voidage due to contraction of the mixed bed relative to the volumetric sum of the corresponding monocomponent beds. Models are proposed to predict contraction reported in the literature for both upflow and downflow fluidization.

Monitoring Electrostatic Charges In Fluidized Beds, Xiaotao T. Bi, Aihua Chen, John R. Grace

The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering

A novel analysis procedure for dynamic collision probes has been developed to monitor the charge density of particles in gas-solids fluidized beds based on the mean and normalized standard deviation of current signals. The contribution from hydrodynamic changes is decoupled from the changes in specific particle charge density based on the principles that the average current is related to charge transfer and/or triboelectrification due to the contact between the probe and particles, whereas the normalized standard deviation of current signals is mainly related to the hydrodynamic changes of the fluidized bed. The correlation between hydrodynamic changes and current signal fluctuations …

Microfluidic Velocity Measurements Using Three-Dimensional Confocal Micro Particle Tracking Velocimetry (Cm-Ptv), Orin Hemminger, Zhao Yu, Chunhe Zhang, L. James Lee, L .S. Fan

The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering

In the past, confocal microscopy was limited by its slow temporal resolution and was not a practical tool for imaging dynamic systems. Recent improvements in spinning disk confocal microscopy and high-speed camera technology have made it a viable technique for imaging of microfluidic systems. Here, a confocal micro particle tracking velocimetry (CM-PTV) system is demonstrated with the ability to obtain 3D velocity profiles at high flow rates.

Scale-Up Effect On Heat Transfer In A Fluidized Bed Near The Onset Of Turbulent Fluidization, A. Stefanova, John R. Grace, C. Jim Lim, Xiaotao T. Bi, K.S. Lim, J. Sanderson

The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering

Heat transfer coefficients were measured in 0.29 m ID and 1.56 m ID fluidization columns with the same heater tube, identical alumina particles and geometrically scaled distributors. The maximum coefficients occurred in the turbulent fluidization flow regime. The Froude number based on superficial velocity and column diameter captures the scale-up effect well, so long as the heater is located in a region of similar flow structure.

Time Scale Analysis Of A Fluidized-Bed Catalytic Reactor Based On A Generalized Dynamic Model, Andres Mahecha-Botero, John R. Grace, Said S.E.H. Elnashaie, C. Jim Lim

The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering

A fluidized-bed reactor model is implemented to simulate a Maleic Anhydride (MA) reactor with special emphasis on its dynamic behaviour. The dynamic model is general enough that it can treat a wide range of catalytic systems, subject to mass and energy balances within the phases. The model represents multiple phases and regions (low-density phase, high-density phase, freeboard region) and can account for heat and mass axial and radial anisotropic dispersion, change in molar/volumetric flow due to reaction, temperature and pressure profiles, hydrodynamic regime variation, catalyst deactivation, energy options, and multiple membranes of various geometries for introduction/extraction of any compound. The …

Title Page - Table Of Contents - Preface - List Of Reviewers, Xiaotao T. Bi, Franco Berruti, Todd S. Pugsley

The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering

No abstract provided.

Improved Standpipe Entrance For Stable High-Flux Flow, D. Rusnell, John R. Grace, Xiaotao T. Bi, C. Jim Lim, P. Ronan, C. A. Mcknight

The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering

Cold model tests were used to show the causes of instabilities in the operation of the standpipe entrance (“sore thumb”) in industrial scale fluid cokers. New geometries were tested which might provide higher flows and prevent operating problems such as flow reversals and flooding, while also minimizing the adverse effects of fouling. The tests were conducted using FCC particles in a geometrically and dynamically scaled half-column of approximately 1/9th scale which had previously been used to show the effects of baffles on fluid coker strippers. The addition of sloping surfaces to increase the surface area for ingress of particles was …

Presentation Slides: Analytical Multi-Scale Methodology For Fluidization Systems - Retrospect And Prospect, Jinghai Li

The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering

No abstract provided.

Exponent Vol. 38, No. 5, 2007-05-13, University Of Alabama In Huntsville

2007

No abstract provided.

Flow Characteristics Of Fully Wetted Binary Solid Mixtures In Gas Fluidized Beds With Inclined Gas Distributors, Yusumi Nagahashi, John R. Grace, Norman Epstein, Yutaka Asako, Akira Yokogawa

The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering

A unique gas-fluidized bed in which fluidization is enhanced by adding a little water has potential for soft abrasive washing of various products. Preliminary experiments were carried out for the washing of farm products. Gas fluidized beds of binary solids mixtures with inclined gas distributors provide hydrodynamic and mixing data assisting the design of dry and wet gas-fluidized beds.

Gas-Solid Structure In The Vicinity Of A Sparger Nozzle In A Fluidized Bed, Pierre Sauriol, Heping Cui, Jamal Chaouki

The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering

An experimental approach is proposed to investigate the gas-solid structure in the vicinity of a sparger nozzle in a fluidized bed. The local hydrodynamics were studied under injection velocities ranging between 0 and 100 m/s and three orientations. A fiber-optic probe was used to measure the instantaneous local particle holdup near the tip of the sparger nozzle. Under the investigated conditions, the local gas-solid structure was influenced on the measurement position, nozzle orientation and injection velocity. Four distinct zones were identified from the local particle holdup data, with the boundaries corresponding to characteristic jet lengths. Strong discrepancies were found with …

Doctor Of Medicine Commencement: May 13, 2007, University Of North Dakota

UND Commencement Programs

Doctor of Medicine Commencement program from May 13, 2007.

Spring 2007 Commencement Program, University Of Alabama In Huntsville

Commencement Programs

No abstract provided.

University Of Richmond Commencement Exercises Program - 2007

Commencement Programs

University of Richmond Commencement Exercises Program, 2007. Including Conferring of Degrees to School of Arts and Sciences Graduate School: Master of Arts, and Master of Liberal Arts; The E. Claiborne Robins School of Business The Richard S. Reynolds Graduate School: Master of Accountancy, and Master of Business Administration; School of Arts & Sciences: Bachelor of Arts, and Bachelor of Science; The E. Claiborne Robins School of Business: Bachelor of Science in Business Administration; Jepson School of Leadership Studies: Bachelor of Arts.