• 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)
  • ratio
  • b) a modified porous filler selected from the group consisting of alumina, silica, pumice and scoria, having a surface modifying agent coated thereon in an amount such that the CO 2 /O 2 permeability ratio is reduced to approximately 0.5 to 5. (google.es)
  • It is the ratio of the effective permeability of that phase to the absolute permeability. (wikipedia.org)
  • Thus the required pressure/flow ratio can be obtained from the ratio of the two manometer readings, and when fed into the Carman equation, yields an "absolute" value of the air permeability surface area. (wikipedia.org)
  • A number of factors affect the permeability of soils, from particle size, impurities in the water, void ratio, the degree of saturation, and adsorbed water, to entrapped air and organic material. (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)
  • 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)
  • 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)
  • 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)
  • 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)
  • 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)
  • The water permeability of hardened coral concrete was investigated to learn the effects of mix design factors. (dtic.mil)
  • Controlled permeability formwork (CPF) is a system proven to significantly enhance the durability of surface concrete during the casting process. (wikipedia.org)
  • fluid
  • 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)
  • permeability is a portion of this, and is a property of the porous media only, not the fluid. (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)
  • increases
  • The induction of MPT, which increases mitochondrial membrane permeability, causes mitochondria to become further depolarized, meaning that Δψ is abolished. (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)
  • 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)
  • To check such a sample, user may have to use an attachment to the permeability meter called a core permeability tube. (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)
  • water
  • In case of gas-water system or gas-oil system there are Corey correlations similar to the oil-water relative permeabilities correlations shown above. (wikipedia.org)
  • The permeability is reduced due to the presence of air which causes a blockage to the passage of water. (wikipedia.org)
  • increase
  • An increase in permeability usually indicates a more open structure in the rammed sand, and if the increase continues, it will lead to penetration-type defects and rough castings. (wikipedia.org)
  • known
  • On standard specimen as a sample For sands that can be compressed, e.g.: bentonite-bonded sand, also known as green sand, a compressed or rammed sample is used to check permeability. (wikipedia.org)
  • structure
  • Based on the conventional center-fed circular epsilon-negative (ENG) zeroth-order resonator (ZOR) antenna, dendritic structure negative permeability metamaterial (NPM) is used as the substrate to enhance the gain of the omnidirectional antenna. (hindawi.com)
  • grain
  • The grain size, shape and distribution of the foundry sand, the type and quantity of bonding materials, the density to which the sand is rammed, and the percentage of moisture used for tempering the sand are important factors in regulating the degree of permeability. (wikipedia.org)