Membrane by diffusion. Medical search. Frequent questions

The limit chain's intensities are proportional to membranes' permeability and inversely proportional to the domains' sizes. (uni-konstanz.de)
After matching the models for the relative dispersion the remaining differences in relative skewness are predicted, discussing the relative roles of membrane permeability, cellular binding and cytoplasmic transport. (nih.gov)
The availability of free energy is one of the factors that determine if a molecule will move across a membrane, the other being the permeability of the molecule in the lipid bilayer. (wikibooks.org)
The partition parameter and permeability values indicate the maximum diffusion of nitroxyl spin probes in the bilayer lipid membranes at 2 mM concentration of nitroxyl radical. (elsevierpure.com)
For the highly protein bound compound, diclofenac, dermis permeability, and partition coefficient determined in the presence of the dialysis membrane were significantly higher than those determined in its absence. (cdc.gov)
The membranes are composed primarily of a bimolecular lipid matrix, which determines membrane permeability characteristics. (msdmanuals.com)
The enamel permeability is low, but it acts as a semipermeable membrane allowing the diffusion of water and some ions. (bvsalud.org)
This resting potential is determined by the concentration gradients of 2 major ions, Na + and K + , and the relative membrane permeability to these ions (also known as leak currents). (medscape.com)

Ras proteins are attached by a fatty tail to the inner surface of the cell membrane. (elifesciences.org)
Diffusing molecules move through the membrane with the help of transport protein or carrier proteins. (biologydiscussion.com)
In the classical view, cell membrane proteins undergo isotropic random motion, that is a 2D Brownian diffusion that should result in an homogeneous distribution of concentration. (biomedcentral.com)
Diffusion of lipids and GPI-anchored proteins in actin-free plasma membrane vesicles measured by STED-FCS. (ox.ac.uk)
Here we use superresolution STED microscopy combined with fluorescence correlation spectroscopy (STED-FCS) to access and compare the diffusion characteristics of fluorescent lipid analogues and GPI-anchored proteins (GPI-APs) in the live-cell plasma membrane and in actin cytoskeleton-free, cell-derived giant plasma membrane vesicles (GPMVs). (ox.ac.uk)
It has become increasingly evident that the spatial distribution and the motion of membrane components like lipids and proteins are key factors in the regulation of many cellular functions. (sns.it)
Here we present the experimental protocol for studying the dynamics of fluorescently-labeled plasma-membrane proteins and lipids in live cells with high spatiotemporal resolution. (sns.it)
Great visuals will support understanding of membrane proteins, cell membranes, active transport, and diffusion. (lessonplanet.com)
To solve this problem, the cell membrane contains proteins that are selective for unique, water soluble molecules. (wikibooks.org)
The transport may be active transport by carrier proteins with an energy source, or it may be facilitated diffusion or passive transport via channels. (wikibooks.org)
Both facilitated diffusion and active transport require specialised membrane proteins, which are highly selective about their substrates. (byjus.com)
What is the function of transport proteins embedded in the cell membrane? (cheatography.com)
The results show that, in the absence of a stratum corneum barrier, attention must be given to the diffusion of soluble proteins in order to obtain accurate estimates of transport and partitioning parameters for highly protein bound solutes in dermis. (cdc.gov)
Proteins act as Cell Identification Markers Lipids and proteins within the membrane may have a carbohydrate chain attached These glycolipids and glycoproteins often function as cell ID markers, allowing cells to identify other cells This is particularly important in the immune system where cells patrolling the body's tissues identify and destroy foreign invaders such as bacteria or viruses. (slideshare.net)
Carrier Proteins They do not extend through the membrane They bond and drag molecules through the lipid bilayer and release them on the opposite side. (slideshare.net)
Sometimes various globular proteins embedded in the matrix function as receptors and help transport molecules across the membrane. (msdmanuals.com)
The aquaporins (AQPs) form a family of integral membrane proteins that facilitate the movement of water across biological membrane by osmosis, as well as facilitating the diffusion of small polar solutes. (lu.se)
However, recent studies have suggested that targetting the trafficking of AQP proteins to the plasma membrane is a viable alternative drug target to direct inhibition of the water-conducting pore. (lu.se)
Fluorescence spectroscopic investigations of the dynamic properties of proteins, membranes and nucleic acids. (bvsalud.org)
In the following, we refer to pump of halophilic archaebacteria, has become the these as the extracellular (EC) channel and the paradigm of membrane proteins in general and ion cytoplasmic (CP) channel. (lu.se)

This greater velocity means that, in theory, the particles should come into contact with the membrane wall more often, and with greater force, making the molecules move through the membrane at a faster rate. (okstate.edu)
What substances move through the membrane the easiest? (brainscape.com)

In this Activity, students investigate the process of osmosis through a differentially-permeable membrane formed by the precipitation of copper(II) hexacyanoferrate(II). (chemedx.org)
We prove an averaging principle which asserts convergence of diffusions on domains separated by semi-permeable membranes, when the speed of diffusion tends to infinity while the flux through the membranes remains constant. (uni-konstanz.de)
Challenge your biology class to analyze an experimental setup, in which a selectively permeable membrane separates two distinct solutions. (lessonplanet.com)
Why do two solutes permitted to diffuse simultaneously across a semi-permeable membrane both end up at equal concentrations on both sides? (stackexchange.com)
If we allow these two solutes to diffuse across a semi-permeable membrane that permits both, my reading seems to suggest that we would eventually expect 50% of solute a to occur on side 1 and 50% on side 2. (stackexchange.com)
The lipid bilayer of cell membranes is impermeable to large and polar molecules but permeable to water molecules and other small uncharged molecules like O 2 and CO 2 . (wikibooks.org)
Osmosis is the diffusion of water through a semi-permeable membrane. (wikibooks.org)
This study illustrates that ESR can be used to differentiate between the intra and extra- membrane water by loading the liposome vesicles with a lipid-permeable nitroxyl spin probe. (elsevierpure.com)
Why are membranes described as partially permeable? (brainscape.com)
In addition, because the nerve membrane is permeable to potassium ions and impermeable to sodium ions, 95% of the ionic leak in excitable cells is caused by K + ions in the form of an outward flux, accounting for the negative resting potential. (medscape.com)

We also have solute b, which is has a much lower concentration (let's say 0.01%) on side 2 of a semipermeable membrane. (stackexchange.com)
Perhaps they do, and the diffusion kinetics of solute a would dictate that it reaches equilibrium much faster than solute b? (stackexchange.com)
The rate at which solute A moves from left to right is proportional to the rate at which molecules of solute A on the left side randomly collide with the membrane. (stackexchange.com)

otherwise, it is called anomalous diffusion or non-Fickian diffusion. (wikipedia.org)
Lasting MCSs between endo-lysosomes containing NPC2 and mitochondria move by slow anomalous sub-diffusion, providing location and time for sterol transport between both organelles. (nature.com)
Plasma membrane dynamics have become increasingly of interest due to recent discoveries on anomalous lipid diffusion in live cells. (tudelft.nl)
The resulting 2-dimensional maps of relaxation time and stretching exponent evidence anomalous (sub-diffusive) and anisotropic diffusion of membrane hydration water varying on nanometer distances. (lu.se)

Dm: diffusing capacity of the alveolar capillary membrane. (biomedcentral.com)
Alveolar-capillary membrane diffusion measurement by nitric oxide inhalation in heart failure / A. Magini, A. Apostolo, E. Salvioni, G. Italiano, F. Veglia, P. Agostoni. (unimi.it)
The diffusion capacity of the lung for carbon monoxide (DLCO) is used to measure the body's ability to transfer oxygen across the alveolar-capillary membrane. (medscape.com)

The movement of the molecules of gases, liquids and solids from the region of higher concentration of the region of lower concentration is known as Diffusion. (biologydiscussion.com)
Therefore, more the concentration of diffusing molecules in a system, their diffusion will also be greater. (biologydiscussion.com)
The rate of diffusion of any substance is directly proportional to the difference in concentration of its molecules or ions in the two regions, and inversely proportional to the distance between these two regions. (biologydiscussion.com)
Concentration of the diffusing particles and the density of the liquid or gas through which the diffusion occurs markedly influences the rate of diffusion. (biologydiscussion.com)
The driving force for the one-dimensional diffusion is the quantity −∂φ/∂x, which for ideal mixtures is the concentration gradient. (wikipedia.org)
If we assume that the solvent is the same on both sides of the membrane (or that the solvent itself can penetrate the membrane) then the final equilibrium will have the same concentration across the membrane. (stackexchange.com)
As the concentration on the right side increases to be equal to the concentration on the left, so the diffusion rates become equal and there is zero nett diffusion and the system approaches equilibrium. (stackexchange.com)
When ΔG is positive the transport is active, an input of energy is needed to move a molecule up a concentration gradient, contrary to ΔG being negative the transport is passive, which means that such molecules will pass through a membrane down their own gradient, simple diffusion. (wikibooks.org)
Diffusion is the process by which molecules migrate over the cell membrane from areas of higher concentration to areas of lower concentration. (wikibooks.org)
A diffusion coefficient is a factor of proportionality that represents the amount of substance diffusion across a unit area through a unit concentration gradient in unit time. (wikibooks.org)
1) Tracer diffusion is the spontaneous mixing of molecules that occurs in absence of a concentration gradient. (wikibooks.org)
2) Chemical diffusion occurs in the presence of a concentration gradient. (wikibooks.org)
Water will move from an area with a higher concentration of water to the other side of the membrane with a lower concentration of water. (wikibooks.org)
Diffusion is the passive movement of substances down their concentration gradients, requiring no expenditure of cellular energy. (jove.com)
Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. (jove.com)
How does concentration affect the rate of diffusion? (brainscape.com)
Drugs diffuse across a cell membrane from a region of high concentration (eg, gastrointestinal fluids) to one of low concentration (eg, blood). (msdmanuals.com)
This active transport creates a concentration gradient that favors the extracellular diffusion of potassium ions. (medscape.com)

Cholesterol in Cell Membrane The phospholipid bilayer also contains cholesterol molecules. (slideshare.net)
We report on diffusion of hydration between phospholipid membranes using incoherent quasi-elastic neutron scattering (QENS) and computer simulations [1]. (lu.se)

For this experiment we attempted to determine the relationship between the rate of diffusion of a solution through a semipermeable membrane and the temperature of the solution. (okstate.edu)
Our hypothesis about this relationship was that as the temperature of a given solution increases, the rate of diffusion through a semipermeable membrane will also increase, because the amount of thermal energy present in the solution is directly proportional to the rate of diffusion. (okstate.edu)
They use a thistle tube and a semipermeable membrane to. (lessonplanet.com)
on side 1 of a semipermeable membrane. (stackexchange.com)
Osmosis is very important in biological systems because many membranes are semipermeable. (wikibooks.org)
Unless given IV, a drug must cross several semipermeable cell membranes before it reaches the systemic circulation. (msdmanuals.com)

Instructors could contrast osmosis with diffusion, a principal method of movement of substances within biological cells. (chemedx.org)
The first half requires biology class members to answer questions about diffusion and osmosis with the aid of diagrams. (lessonplanet.com)
The four main types in include diffusion, facilitated diffusion, filtration and osmosis. (wikibooks.org)
New, fouling-reducing membrane coatings could be developed and then applied to commercially available reverse osmosis (RO), ultrafiltration (UF), and nanofiltration (NF) membranes to reduce membrane fouling and markedly improve membrane lifetime for produced-water purification. (doe.gov)

Importantly, both the diffusion and trafficking properties of KRas G12D remain invariant over a broad range of protein expression levels. (elifesciences.org)
By using a GFP-tagged variant of the Transferrin Receptor (TfR) and an ATTO488 labeled 1-palmitoyl-2-hydroxy-sn-glycero-3-phosphoethanolamine (PPE) it is possible to observe the spatiotemporal regulation of protein and lipid diffusion on µm-sized membrane regions in the micro-to-milli-second time range. (sns.it)
Simple diffusion does not require a protein carrier, and so does not involve any of the other given characteristics. (byjus.com)
Composition of Cell Membrane  Cell Membranes are NOT all identical, but have FOUR common parts:  Lipid Bilayer  Transmembrane Protein  Network of supporting fibers  Glycoproteins  On outside of cell  Cell Surface has a carbohydrate coat to prevent sticking. (slideshare.net)
While the locations and inferred H-bond connec- water molecules in a membrane protein, despite tivities of these internal water molecules are essen- being deeply buried and extensively H-bonded to tial, one would also like to quantify their mobility. (lu.se)

Isolated human dermis obtained from surgical reduction was mounted in side-by-side diffusion cells in the presence and absence of a dialysis membrane (5000 MW cut-off) placed between the dermis and the donor solution. (cdc.gov)

DESIGN: Diffusion is measured as CO total diffusion (DLCO), which has two components: membrane diffusion (Dm) and capillary volume, the latter related to CO and O2 competition for hemoglobin. (unimi.it)

Diffusion and interaction dynamics of molecules at the plasma membrane play an important role in cellular signaling and are suggested to be strongly associated with the actin cytoskeleton. (ox.ac.uk)
Our data underline the crucial role of the actin cortex in maintaining hindered diffusion modes of many but not all of the membrane molecules and highlight a powerful experimental approach to decipher specific influences on molecular plasma membrane dynamics. (ox.ac.uk)

Diffusing molecules or ions do not combine with the constituents of the membrane. (biologydiscussion.com)
3. During passive salt uptake the ions are absorbed by the process of diffusion. (biologydiscussion.com)
In dilute aqueous solutions the diffusion coefficients of most ions are similar and have values that at room temperature are in the range of (0.6-2)×10−9 m2/s. (wikipedia.org)
There exists an exchange of molecules and ions in and out of the cell wall, as well as in and out of membrane-bounded intracellular compartments such as the nucleus, ER, and mitrochondria. (wikibooks.org)
Initially, sodium ions gradually enter the cell through the nerve cell membrane. (medscape.com)
Once membrane depolarization is complete, the membrane becomes impermeable to sodium ions again, and the conductance of potassium ions into the cell increases. (medscape.com)

Particle-based reaction-diffusion algorithms facilitate the modeling of the diffusional motion of individual molecules and the reactions between them in cellular environments. (biomedcentral.com)
Two concepts have been proposed for the cytoplasmic distribution process of hydrophobic or amphipathic molecules, (i) slowing of diffusion due to instantaneous binding to immobile cellular structures and (ii) slow binding after instantaneous distribution throughout the cytosol. (nih.gov)
The relative dispersion of cellular residence times is introduced as a model-independent measure of cytoplasmic equilibration kinetics, which indicates whether diffusion through the cytoplasm is rate limiting. (nih.gov)
Membrane & Cellular Functions, Inst. (unige.ch)
2008. Agnieszka Nowacka, Water exchange through a cellular membrane: theoretical model and accuracy evaluation. (lu.se)
2007. Agnieszka Nowacka, Water exchange through a cellular membrane. (lu.se)

According to the law of diffusion of gases, the rate of diffusion is inversely proportional to the square root of the density of gas. (biologydiscussion.com)

This revealed that Ras molecules quickly diffuse along the inside of the membrane until they arrive at certain locations that cause them to halt. (elifesciences.org)
Because the cell membrane is lipoid, lipid-soluble drugs diffuse most rapidly. (msdmanuals.com)
It is usually used to separate low-molecular-weight solutes which diffuse through the membrane from the colloidal and high-molecular-weight solutes which do not. (bvsalud.org)

The kinetics and equilibrium of molecular oxygen sorption in the membrane containing left bracket alpha , alpha prime , alpha double prime , alpha triple prime -meso-tetrakis(o-pivalamidophenyl) porphinato right bracket cobalt(II)-1-methylimidazole (CoPIm) complex which forms oxygen adduct rapidly and reversibly are studied spectroscopically. (elsevierpure.com)
What is the relati-onship between rate of diffusion and molecular weight? (cheatography.com)

A process of selective diffusion through a membrane. (bvsalud.org)

We aim to model diffusion-driven aggregation of particles embedded in a quasi-2D membrane. (calpoly.edu)
Diffusion pressure is directly proportional to the number of diffusing particles. (biologydiscussion.com)
If the temperature is raised, diffusion is accelerated because the velocity of the diffusing particles is increased. (biologydiscussion.com)
In the last decades, numerous works have been published on the use of inorganic particles in various polymeric membrane structures and their functionalities [ 1 , 8 - 13 ]. (springer.com)
Following diffusion, particles will continue to move from one side to the other due to random motion but at a constant exchange rate with no net movement to achieve dynamic equilibrium. (jove.com)

What is meant by simple diffusion? (brainscape.com)

From there, the cell constantly removed Ras molecules from these membrane domains and returned them back to their 'fast' diffusing state. (elifesciences.org)
6. Diffusion keeps the cell walls of the internal plant tissues moist. (biologydiscussion.com)
Hindered diffusion of phospholipids and sphingolipids is abolished in the GPMVs, whereas transient nanodomain incorporation of ganglioside lipid GM1 is apparent in both the live-cell membrane and GPMVs. (ox.ac.uk)
In order to achieve this, manufacturers on focusing their attention on mass manufacturing of the fuel cell stack comprised of proton-exchange membrane fuel cells (PEMFC). (transparencymarketresearch.com)
Enables them to be embedded in the nonpolar (hydrophobic) area of the membrane  Polar regions are anchored in the water  Provide CHANNELS into the cell but only for selected items. (slideshare.net)
Cell membranes are biologic barriers that selectively inhibit passage of drug molecules. (msdmanuals.com)
The un-ionized form is usually lipid soluble (lipophilic) and diffuses readily across cell membranes. (msdmanuals.com)
The ionized form has low lipid solubility (but high water solubility-ie, hydrophilic) and high electrical resistance and thus cannot penetrate cell membranes easily. (msdmanuals.com)
2011. Filip Markeling, Water diffusion in fuel cell membranes. (lu.se)

A specific characteristic has been found in the exponential relation between lateral lipid diffusion and temperature. (tudelft.nl)

Temperature greatly influences the rate of diffusion. (biologydiscussion.com)
The strongly adsorbed species are less dependent on gas translation or Knudsen diffusion since the surface diffusion is very significant in the whole temperature range investigated. (unical.it)
In our research we came across a study done by Inselsbacher and Näsholm which found that as temperature of soil decreases, the diffusion of plant available nitrogen through soil slows down (Inselsbacher and Näsholm, 2012). (okstate.edu)
We believe this study is not sufficient to determine the relationship between the rate of diffusions through our dialysis tube and temperature because soil is innately heterogeneous, while our dialysis tube is homogenous throughout. (okstate.edu)
The implication of this research would be to give us an idea of the optimal temperature to use the membrane the corporation wants us to test. (okstate.edu)
Since the textile processing of HFs can damage the wall of the fiber or close the fiber bore, the membrane properties of the obtained structures are tested with a CO 2 /CH 4 mixture in the temperature range of 0 to 40 °C. It is shown that HFs within the textile structure keep the same transport and separation characteristics compared to initial HFs. (mdpi.com)
How does an increase in temperature affect the rate of diffusion? (brainscape.com)

2018. Jonathan Ekstrand, Visualization of multidimensional diffusion MRI. (lu.se)

All the factors that alter the chemical potential of molecules will ultimately influence the rate of diffusion. (biologydiscussion.com)
Density of the diffusing gas itself determines the rate of diffusion. (biologydiscussion.com)
What does heating water do to the rate of diffusion of tea? (cheatography.com)
Higher temper-atures increase the rate of diffusion. (cheatography.com)
What are the two factors which affect the rate of diffusion? (brainscape.com)
How can you calculate the rate of diffusion? (brainscape.com)

It is expected that in quasi-2D membranes the reduction of the aggregation rate will be even more pronounced due to a slower spatial decay of hydrodynamic interactions in 2D. (calpoly.edu)
A new fluorescence quenching method to study chlorinated hydrocarbon-membrane interactions. (bvsalud.org)

Small molecules tend to penetrate membranes more rapidly than larger ones. (msdmanuals.com)

Hong Jiang, Developing novel diffusion MRI methods for comprehensive analysis of restricted and anisotropic self-diffusion system (assistant supervisors: Samo Lasic and Dan Lundberg). (lu.se)

Diffusion rate is directly proportional to the gradient but also depends on the molecule's lipid solubility, size, degree of ionization, and the area of absorptive surface. (msdmanuals.com)

Functionalised titanate nanotubes (TiNTs) were incorporated to poly(5,5-bisbenzimidazole-2,2-diyl-1,3-phenylene) (PBI) or poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) for improving the interfacial compatibility between the polymer matrix and inorganic material and for altering the gas separation performance of the neat polymer membranes. (springer.com)
reported on the addition of functionalised MWNT to polyvinylchloride (PVC) membranes which resulted in better gas separation performance, especially for CO 2 /CH 4 [ 22 ]. (springer.com)
The main benefit of the project would be the development of new coatings for membranes that will be more resistant-or completely resistant-to fouling and thus would result in better overall separation performance than that of uncoated membranes. (doe.gov)

We develop a multiscale simulation model for diffusion of solutes through porous triblock copolymer membranes. (aip.org)

4. Diffusion is an effective means of transport of substances helps in the translocation of food material. (biologydiscussion.com)
A property of a plasma membrane that allows some substances to cross more easily than others. (cheatography.com)

In two or more dimensions we must use ∇, the del or gradient operator, which generalises the first derivative, obtaining J = − D ∇ φ {\displaystyle \mathbf {J} =-D\nabla \varphi } where J denotes the diffusion flux vector. (wikipedia.org)
Beyond this, in chemical systems other than ideal solutions or mixtures, the driving force for diffusion of each species is the gradient of chemical potential of this species. (wikipedia.org)

When a diffusion process does not follow Fick's laws (which happens in cases of diffusion through porous media and diffusion of swelling penetrants, among others), it is referred to as non-Fickian. (wikipedia.org)
In the present work, anion exchange membranes with high-conductivity were fabricated by aligning ion channels of the polymer electrolyte impregnated in porous polytetrafluoroethylene (PTFE) under electric fields. (rsc.org)

KRas G12D exhibits an immobile state in ~70 nm domains, each embedded in a larger domain (~200 nm) that confers intermediate mobility, while the rest of the membrane supports fast diffusion. (elifesciences.org)
Moreover, KRas G12D is continuously removed from the membrane via the immobile state and replenished to the fast state, reminiscent of Ras internalization and recycling. (elifesciences.org)
However, computer models consisting of just the 'fast' and 'immobile' state could not correctly re-capture the way Ras molecules moved along the membrane. (elifesciences.org)

Pure water (solvent) would have more diffusion pressure than sugar solution. (biologydiscussion.com)
1. The process of diffusion is involved in the transpiration of water vapours. (biologydiscussion.com)
Movement of water and dissolved materials through a membrane from an area of higher pressure to an area of lower pressure. (encyclopedia.com)
Initial work on this project has shown that commercial RO membrane performance for oil-in-water emulsion filtration falls far below that of pure water filtration, demonstrating the need for fouling-resistant materials. (doe.gov)
Fouling is the most significant roadblock to wider adoption of membrane technology for desalination specifically and water purification in general. (doe.gov)
The combination of a well-aligned stack of DMPC membranes with the large, 2-dimensional detectors available at the neutron spectrometer Let (ISIS, UK) allows for simultaneous access to water motions lateral and perpendicular to the membranes. (lu.se)

If differences in outflow curve shapes (their relative skewness) cannot be detected, independent information on binding and/or diffusion kinetics is necessary to avoid model misspecification. (nih.gov)

2019. Paolo Mezzani, Detecting brain tumors with diffusion MRI: a computational study. (lu.se)

Mitochondria receive cholesterol from late endosomes and lysosomes (LE/LYSs) or from the plasma membrane for production of oxysterols and steroid hormones. (nature.com)

Using Markov Chain Monte Carlo image simulations, we show that interaction between both organelle types, a defining feature of membrane contact sites (MCSs) can give rise to the observed spatial organelle distribution. (nature.com)

1. The exchange of gases through stomata (for example, CO 2 intake and O 2 output during photosynthesis, and CO 2 output and O 2 intake during respiration takes place by the principal of independent diffusion. (biologydiscussion.com)
Today, Fick's Laws form the core of our understanding of diffusion in solids, liquids, and gases (in the absence of bulk fluid motion in the latter two cases). (wikipedia.org)
Gas translation diffusion is proposed to compete with surface diffusion for describing the permeation of light gases (He, H2, CO2 and CO) through zeolite membranes. (unical.it)
Diffusion plays an integral role in biological processes such as respiration, the process by which organisms exchange gases with their environment. (jove.com)

In one (spatial) dimension, the law can be written in various forms, where the most common form (see) is in a molar basis: J = − D d φ d x {\displaystyle J=-D{\frac {d\varphi }{dx}}} where J is the diffusion flux, of which the dimension is the amount of substance per unit area per unit time. (wikipedia.org)
Gas translation paired to surface diffusion well reproduces the maximum in H2 flux, which was missed by the Knudsen diffusion (Caravella et al. (unical.it)
When commercially available UF, RO, and/or NF membranes are exposed to mixtures of salt, emulsified oil droplets, and other particulate matter, their lifetime decreases catastrophically due to dramatic and largely irreversible permeate flux reduction, which causes fouling of the membranes by organic components (primarily from emulsified oil droplets). (doe.gov)

What is the most important feature of the cell's phosph-olipid membrane? (cheatography.com)

Here, using single particle tracking with photoactivated localization microscopy (spt-PALM) and detailed trajectory analysis, we show that distinct membrane domains dictate KRas G12D (an active KRas mutant) diffusion and trafficking in U2OS cells. (elifesciences.org)
Passive transport is the moving of biochemicals across membranes of cells without the use of chemical energy. (wikibooks.org)
PEM (proton exchange membrane) fuel cells are paving the way for innovations in automotive applications. (transparencymarketresearch.com)

Macromolecular diffusion plays a fundamental role in biological processes. (biomedcentral.com)
Designing hollow fiber (HF) membrane modules occupies one of the key positions in the development of efficient membrane processes for various purposes. (mdpi.com)

The diffusion of oxygen in the membrane is found to be Fickian. (elsevierpure.com)

It is notable that Fick's work primarily concerned diffusion in fluids, because at the time, diffusion in solids was not considered generally possible. (wikipedia.org)

Many biological membranes can be modeled as two-dimensional (2D) viscous fluid sheets surrounded by three-dimensional (3D) fluids of different viscosity. (calpoly.edu)

2015. Mikael Novén, Multidimensional diffusion MRI method for measuring nerve fiber orientation distribution functions. (lu.se)

Visualization of the membrane environment surrounding the insulin receptor. (unige.ch)

Cite this: How to Interpret a Diffusion Capacity of the Lung for Carbon Monoxide - Medscape - Mar 07, 2017. (medscape.com)

Such membranes are dubbed quasi-2D as they exhibit properties of both 2D and 3D fluids. (calpoly.edu)
The Saffman length is a parameter that describes the energy exchange between the membrane and bulk fluids and controls the cross-over from 2D to 3D hydrodynamics. (calpoly.edu)

Anatomy52

Organisms11

Diseases2

Chemicals and Drugs80

Analytical, Diagnostic and Therapeutic Techniques and Equipment43

Phenomena and Processes61

Disciplines and Occupations6

Technology, Industry, Agriculture8

Information Science9

Health Care3

Permeability8

Proteins20

Move through the membrane2

Permeable10

Solute3

Anomalous4

Alveolar capillary membrane3

Concentration18

Phospholipid2

Semipermeable6

Osmosis4

Protein5

Dialysis membrane1

Capillary volume1

Dynamics2

Ions6

Cellular6

Inversely proportional1

Diffuse3

Molecular2

Selective1

Particles5

Simple diffusion1

Cell9

Lipid diffusion1

Temperature7

20181

Rate of diffusion6

Interactions2

Penetrate1

Anisotropic1

Directly proportional1

Separation3

Multiscale1

Substances2

Gradient2

Porous2

Immobile3

Water6

Kinetics1

20191

Plasma1

Interaction1

Gases4

Flux3

Cell's1

Cells3

Processes2

Fickian1

Primarily1

Fluid1

Functions1

Visualization1

Cite1

Fluids2