• molecules
  • Opening allows increase in the permeability of the mitochondrial membranes to molecules of less than 1500 Daltons in molecular weight. (wikipedia.org)
  • The enhanced permeability and retention (EPR) effect is a controversial concept by which molecules of certain sizes (typically liposomes, nanoparticles, and macromolecular drugs) tend to accumulate in tumor tissue much more than they do in normal tissues. (wikipedia.org)
  • gases
  • New to this edition are 92 resin chapters containing textual summary information including: category, general description, processing methods, applications, and general permeability considerations for water vapor, oxygen, and other gases including aroma and flavor. (elsevier.com)
  • Sometimes permeability to gases can be somewhat different that those for liquids in the same media. (wikipedia.org)
  • Permeability is a property of foundry sand with respect to how well the sand can vent, i.e. how well gases pass through the sand. (wikipedia.org)
  • And in other words, permeability is the property by which we can know the ability of material to transmit fluid/gases. (wikipedia.org)
  • Barrier
  • The significant biological subject, the permeability barrier, is incredibly diverse and vital for a vast assortment of crucial functions in the body. (springer.com)
  • In Permeability Barrier: Methods and Protocols , a variety of experienced researchers contribute techniques to study this complex system in its many forms. (springer.com)
  • Authoritative and practical, Permeability Barrier: Methods and Protocols serves as an ideal guide for all scientists seeking to further our understanding of this vital area of research. (springer.com)
  • Membrane permeability is essentially the ability of certain substances to pass in and out of an organic or semi-organic barrier. (wisegeek.com)
  • The intestine normally exhibits some permeability, which allows nutrients to pass through the gut, while also maintaining a barrier function to keep potentially harmful substances (such as antigens) from leaving the intestine and migrating to the body more widely. (wikipedia.org)
  • 2009). P-glycoprotein deficient mouse in situ blood-brain barrier permeability and its prediction using an in combo PAMPA model. (wikipedia.org)
  • Earth Sciences
  • Permeability in fluid mechanics and the earth sciences (commonly symbolized as κ, or k) is a measure of the ability of a porous material (often, a rock or an unconsolidated material) to allow fluids to pass through it. (wikipedia.org)
  • relates
  • The present invention relates to controlled permeability film compositions for use in controlled atmosphere packaging and to the protective packaging of sensitive produce therewith. (google.es)
  • pore
  • Induction of the permeability transition pore, mitochondrial membrane permeability transition (mPT or MPT), can lead to mitochondrial swelling and cell death through apoptosis or necrosis depending on the particular biological setting. (wikipedia.org)
  • equation
  • Permeability is typically determined in the lab by application of Darcy's law under steady state conditions or, more generally, by application of various solutions to the diffusion equation for unsteady flow conditions. (wikipedia.org)
  • 1988
  • In the stability formula developed of VAN DER MEER this effect is represented by the term Notional Permeability with symbol P. A more open, or permeable, structure underneath the armour layer has the ability to dissipate more wave energy and therefore requires less weight of the armour layer. (tudelft.nl)
  • permeable
  • As for permeability, it suggests that residential areas should be permeable enough to allow movement in all directions but no more. (wikipedia.org)
  • Filtered permeability is the concept, supported by organisations such as Sustrans, that networks for walking and cycling should be more permeable than the road network for motor vehicles. (wikipedia.org)
  • hence
  • Paramagnetic materials are attracted to magnetic fields, hence have a relative magnetic permeability greater than one (or, equivalently, a positive magnetic susceptibility). (wikipedia.org)
  • Any foreign matter in water has a tendency to plug the flow passage and reduce the effective voids and hence the permeability of soil. (wikipedia.org)
  • It causes an obstruction to the flow of water in the pores and hence reduces the permeability of soils. (wikipedia.org)
  • Air entrapped in the soil and organic matter block the passage of water through soil, hence permeability considerably decreases. (wikipedia.org)
  • hydraulic
  • M. G. Élbakidze and V. I. Nasberg, Permeability of Concrete Used in Hydraulic Construction, Draft of Changes and Supplements of GOST [in Russian], Tbilisi (1956). (springer.com)
  • meter
  • In SI units, permeability is measured in henries per meter (H/m or H·m−1), or equivalently in newtons per ampere squared (N·A−2). (wikipedia.org)
  • On a prepared mould surface as a sample, permeability can be checked with use of a mould permeability attachment to permeability meter, readings such obtained are of relative permeability, and not absolute permeability. (wikipedia.org)
  • formula is PN = (VxH)/PxAxT where V = volume of air in ml passing through the specimen H = Height of the specimen in cm A = Cross sectional area of specimen in cm2 P = Pressure of air in cm of water T = Time in minutes American Foundry Society has also released a chart where back pressure (P) from a rammed specimen placed on a permeability meter is correlated with a Permeability number. (wikipedia.org)
  • characteristics
  • This extensively revised and updated second edition of the only data handbook available on the properties of commercial polymeric films details the permeability characteristics of over 125 major plastic and elastomer packaging materials. (elsevier.com)
  • The concept of permeability is of importance in determining the flow characteristics of hydrocarbons in oil and gas reservoirs, and of groundwater in aquifers. (wikipedia.org)
  • Concrete
  • S. R. Medvedev and V. I. Medvedev, Remarks on the Work of TNISGÉI Concerning the Permeability of Concrete, Gidrotekhnicheskoe stroitel'stvo, 8 (1959). (springer.com)
  • S. F. Savinov, Uplift on Concrete Dams with Consideration of Permeability of Concrete, Gidrotekhnicheskoe Stroitel'stvo, 4 (1959). (springer.com)
  • V. M. Moiseenko, Uplift on Concrete Dams with Consideration of Permeability of Concrete, Gidrotekhnicheskoe stroitel'stvo, 3 (1960). (springer.com)
  • Temperature
  • The results of four experiments investigating the effect of temperature on the permeability of a bentonite backfill are presented. (mdpi.com)
  • In general, permeability is not a constant, as it can vary with the position in the medium, the frequency of the field applied, humidity, temperature, and other parameters. (wikipedia.org)