Diffusion is the spontaneous spreading of something such as particles, heat, or momentum. The phenomenon is readily observed when a drop of colored water is added to clear water, or when smoke from a chimney dissipates into the air.
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 ...
Diffusion
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Diffusion and Semi-Permeable Membranes
Procedure:
Day 1: Weigh a raw egg and place in 200ml of vinegar. Cover and leave over night. (The shell will disintegrate leaving the membrane visible).
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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.
Unlike active transport, diffusion does not involve chemical energy. When molecules move (diffuse) via special transport proteins found within the cell membrane, it is called facilitated diffusion, otherwise it is only simple diffusion.
diffusion The spontaneous movement of particles from an area of higher concentration to an area of lower concentration. PICTURE ...
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.
digestion ...
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.
Diffusion
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.
Diffusion coefficient In the context of membranes, a means of expressing the lateral mobility of membrane constituents; for lipids, the diffusion coefficient is 2 µm2 s-1.
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.
diffusion of a signaling molecule out of one cell and into other cells in the vicinity; ...
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.
Simple diffusion can only move material in the direction of a concentration gradient; facilitated diffusion moves materials with and against a concentration gradient.
C.
Agar gel diffusion
a laboratory procedure which detects precipitins, a type of antibodies, when serum diffuses in agar and combines with a soluble antigen ...
ANISOTROPIC-DIFFUSION FILTER
An image processing method for reduction of shot noise without degradation of an image.
AOTF ...
Microdevices require less sample input, present narrower sample zones, generate less heat during electrophoresis, and thus suffer less sample-diffusion broadening during shorter, more effective run times.
It is a process called facilitated diffusion. It could be as simple as bringing in a glucose molecule. Since the cell membrane will not allow glucose to cross by diffusion, helpers are needed.
For the reception and diffusion of the weight each acetabular cavity is strengthened by two additional bars running toward the pubis and ischium.
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.
In thin, simple aquatic organisms that are sedentary, gas exchange is simply by diffusion through the "skin" or outer surface of the body. This type of gas exchange is typical of the sponges, Cnidaria, and flatworms.
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 ...
Life is a delay of the spontaneous diffusion or dispersion of the internal energy of the biomolecules towards more potential microstates.
10 Steps of Glycolysis
Cellular Respiration
Diffusion, Passive Transport, and Osmosis
DNA Transcription
Translation
Programmed Cell Death ...
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.
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.
 See also: Trans, Cell, Cells, Organ, Protein
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