Diffusion

diffusion
passage of molecules of one substance among those of another, from a region of greater concentration to one of lower concentration
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
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Diffusion, being the spontaneous spreading of matter (particles), heat, or momentum, is one type of transport phenomena.
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Definition of diffusion :
The net movement of molecules from an area of high concentration to an area of lower concentration until both concentrations are equal.
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Facilitated diffusion (facilitated transport) is a process of passive transport (diffusion) via which molecules diffuse across membranes, with the help of transport proteins (mediated transport).
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Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration. The movement is due to collisions, which occur more frequently in areas of higher concentration.
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Facilitated diffusion
Transmembrane proteins create a water-filled pore through which ions and some small hydrophilic molecules can pass by diffusion. The channels can be opened (or closed) according to the needs of the cell.
Active transport ...
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Diffusion is the net movement of a substance (liquid or gas) from an area of higher concentration to one of lower concentration. You are on a large (10 ft x 10 ft x10 ft) elevator.
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Diffusion. The net movement of units of a substance from areas of higher concentration to areas of lower concentration of that substance
Digestion efficiency. The fraction of living food that does not survive passage through a predator's gut ...
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diffusion
[L. diffundere, to pour out]
The spontaneous tendency of a substance to move down its concentration gradient from a more concentrated to a less concentrated area.
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diffusion: the movement of molecules through a membrane from a region of high concentration to low concentration.
diploid: cells having two sets of chromosomes.
diploid nuclei: contained within a mass of cytoplasm within cellular slime molds.
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diffusion The random movement of molecules from one location to another because of random thermal molecular motion; net diffusion always occurs from a region of higher concentration to a region of lower concentration.
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(diffusion, osmosis, cell cycle/mitosis, photosynthesis, cellular respiration)
Diagram/label cell membrane structure and describe interactions with environment.
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The diffusion gradient of an ion, representing a type of potential energy that accounts for both the concentration difference of the ion across a membrane and its tendency to move relative to the membrane potential.
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ANISOTROPIC-DIFFUSION FILTER
An image processing method for reduction of shot noise without degradation of an image.
AOTF ...
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facilitated diffusion Diffusion of a molecule across a biological membrane via a protein transporter down a concentration gradient. Also called passive diffusion. facultative cells Cells that can live in the presence or absence of oxygen.
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Keller, "Reduction of Diffusional Defocusing in Hydrodynamically Focused Flows by Complexing with a High Molecular Weight Adduct," United States Patent, filed December 1996.
R.L. Affleck, W.P. Ambrose, J.D. Demas, P.M. Goodwin, M.E. Johnson, R.A.
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So this convoluted geometry can have flow through it, but for the interior cell clusters, the access of a nutrient is still controlled by diffusion.
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Islam largely arrived in Africa through the Arab conquest of the north, and later diffusion through the Sahara desert into the interior of Africa. Some Muslim communities were also established by seafarers on the eastern coast of Africa.
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passive transport (facilitated diffusion) - movement of a molecule across a membrane down its concentration gradient
peripheral membrane proteins-proteins that can be released from the membrane ...
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Studies of hybrid zones allow us to quantify the genetic differences responsible for speciation, to measure the diffusion of genes between diverging taxa, and to understand the spread of alternative adaptations. (includes related information) Nature.
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In this overview we have hypothesized that production of high concentrations of NO can overcome the diffusional barriers presented by the red cell and result in formation of S-nitrosohaemoglobin.
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