Recent increases in the use of hydraulic fracturing (HF) to aid extraction of oil and gas from black shales have raised concerns regarding potential environmental effects associated with predictions of upward migration of HF fluid and brine. Some recent studies have suggested that such upward migration can be large and that timescales for migration can be as short as a few years. In this articl...

The introduction of lumen-apposing metal stents (LAMS) has been an important development in the management of pancreatic fluid collections. Stent migration out of pancreatic fluid collections into the stomach has been reported, despite the special anti-migratory design of the bi-flanged stent. Data on stent migration rates remain sparse, with some studies suggesting a migration rate of 3.3-5%. ...

The cross-stream migration of a deformable drop in two-dimensional Poiseuille flow at finite Reynolds numbers is studied numerically. In the limit of a small Reynolds number (<1), the motion of the drop depends strongly on the ratio of the viscosity of the drop fluid to the viscosity of the suspending fluid. For a viscosity ratio 0.125, the drop moves toward the centre of the channe while for t...

Objective(s) Air pouch is a well-established inflammatory model in which fluid extravasations; leukocyte migration, angiogenesis and other parameters involved in the inflammatory response can be measured. In this study, the influence of gender on inflammatory parameters has been examined in the air pouch model. Materials and Methods To induce air pouch, adult male and female Wistar rats were...

The migration of a sphere in the pressure-driven channel flow of a viscoelastic fluid is studied numerically. The effects of inertia, elasticity, shear-thinning viscosity, secondary flows and the blockage ratio are considered by conducting fully resolved direct numerical simulations over a wide range of parameters. In a Newtonian fluid in the presence of inertial effects, the particle moves awa...

We investigate the segregation resulting from the competition between advection and shear-induced migration of suspensions in steady open flows. Herringbone channels form a concentration profile deviating from the particle focusing found in straight channels. Transients can result from a buckling instability during the onset of migration when particle-depleted fluid is injected into particle-ri...

Copyright and Moral Rights for the articles on this site are retained by the individual authors and/or other copyright owners. For more information on Open Research Online's data policy on reuse of materials please consult the policies page. Introduction: The parent bodies of primitive meteorites and asteroids of the outer main belt accreted with a significant complement of volatiles such as H ...

Greenwood, L. T. Elkins-Tanton. Dept. of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA ([email protected]). Department of Earth, Planetary, and Space Sciences, UCLA, Los Angeles, MA, USA. Planetary and Space Sciences, The Open University, Milton Keynes MK7 6AA, UK. School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USA.

Budding yeast do the Cdc42 two-step T wo different proteins sequentially activate Cdc42 to ensure yeast form a bud at the right place, Kang et al. reveal. Haploid S. cerevisiae cells form new buds immediately adjacent to the division site from the previous cell cycle. The new bud's position is determined by a protein complex called the axial landmark, which assembles at the mother–bud neck of y...