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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, Osmosis, and Movement Across a Membrane
Spontaneous movement of particles from an area of high concentration to an area of low concentration
Does not require energy (exergonic)
Occurs via random kinetic movement ...

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 ...

From Wikipedia, the free encyclopedia
(Redirected from Concentration gradient) ...

Diffusion and Semi-Permeable Membranes
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).

Unlike active transport, ~ does not involve chemical energy. When molecules move (diffuse) via special transport proteins found within the cell membrane, it is called facilitated ~, otherwise it is only simple ~.

~ occurs in solutions consisting of particles
Air and drinking water are both examples of solutions consisting of mixtures of different types of particles.

Now, what affected your friend in this case is the solubility of nitrogen in water. Solubility is the maximum amount of a solute that will dissolve in a particular solvent at a specific temperature and pressure.
Nitrogen ...

Applied to the movement of molecules in liquids or gazes.
View Dr Chromo's lecture on blood cells
Related Links ...

Cell ~ is a type of passive cell transport. In ~, molecules move from areas of high concentration to areas of low concentration in order to decrease the concentration gradient. ~ from areas of low concentration to areas of high concentration is not energetically favorable ...

~ and Passive Transport: Concentration gradient: is a regular concentration change over a distance in a particular direction. The net directional movement is away from the center of concentration. ~ is the net movement down the concentration gradient.

Substances move down their conc. gradient until the conc. are in equilibrium
Microvilli are extensions of the plasma membrane
They increase the surface area of the membrane, therefore
They accelerate the rate of ~ ...

This is the process that is used in oxygen entering a cell, and carbon dioxide leaving.
These molecules will move from where they are at a high concentration to where they are at a lower concentration. i.e. they diffuse down a concentration gradient.

~: A group of particles, initially confined to a small volume will, over time, disperse. This movement is produced by collisions with neighboring molecules, which are in constant motion.

~ The spontaneous movement of particles from an area of higher concentration to an area of lower concentration. PICTURE
digestion The process of breaking down food into its molecular and chemical components so that these nutrient molecules can cross plasma membranes.

[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 ...

The natural effect of a solute moving from an area of higher concentration to an area of lower concentration.
Covered in BIOL1020 Lab 3 Cells ...

~ /də-FYOO-shən, diff-/ n. The tendency of a substance to move in the direction toward which it is less concentrated.
digestion n. The process by which food is broken down into a form that can be absorbed by the body.

~ 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.

~ and osmosis are similiar in that both of them involve the ... from a region of ... to a region of ....
What is the difference between exosmosis and endosmosis?
I want the answer with examples.

~Net movement of a molecule across a membrane down its concentration gradient at a rate proportional to the gradient and the permeability of the membrane.
patch clamping ...

Blood carries oxygen, carbon dioxide, and hydrogen ions between tissues and the lungs. The majority of CO2 transported in the blood is dissolved in plasma (primarily as dissolved bicarbonate; 60%).

~ - The transport process in which molecules naturally travel from an area of higher concentration to an area of lower concentration.
Glycocalyx - A layer of carbohydrates that coats the exterior of higher-ordered cells. Functions in protecting the cell from damage.

~ of a signaling molecule out of one cell and into other cells in the vicinity;
~ of a signaling molecule from one cell into an adjacent cell that then secretes the same molecule to diffuse to the next cell and so on (a "cell-relay" mechanism); ...

~ alone is not adequate for transporting substances over long distances in animals-for example, for moving glucose from the digestive tract and oxygen from the lungs to the brain of a mammal.

~. 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 ...

~ is the passive movement of particles from a region of high concentration to a region of low concentration.
Osmosis is the passive movement of water molecules, across a partially permeable membrane, from a region of lower solute concentration to a region of higher solute concentration.

~ The random movement of molecules from one location to another because of random thermal molecular motion; net ~ always occurs from a region of higher concentration to a region of lower concentration.
Digastricus di = two; gaster = stomach or belly.

~ the net movement of molecules or ions from a region of high concentration to a region of low concentration.
Digestion the breakdown of food material into simple molecules that can be absorbed by the body.
Dihybrid inheritance the inheritance of two different characteristics.

Simple ~ can only move material in the direction of a concentration gradient; facilitated ~ moves materials with and against a concentration gradient.

Agar gel ~
a laboratory procedure which detects precipitins, a type of antibodies, when serum diffuses in agar and combines with a soluble antigen ...

An image processing method for reduction of shot noise without degradation of an image.
AOTF ...

Flatworms get most of their oxygen through ~. Since they have no specialized circulatory system, their flatness gives them a greater surface area to absorb more oxygen. There are species in many freshwater and saltwater environments as well as inside larger organisms.

Fujikawa A, Tsuchiya K, Katase S, Kurosaki Y, Hachiya J: ~-weighted MR imaging of Carmofur-induced leukoencephalopathy.
Hwang YH, Suh CK, Park SP: Multifocal inflammatory leukoencephalopathy: use of thallium-201 SPECT and proton MRS. ...

Robert Richet for the discovery of anaphylaxis 1914 Robert Brny for research on the vestibular apparatus of the inner ear 1919 Jules Bordet for discovery of the complement in the immune system 1920 Schack August Steenberg Krogh for showing that the gas exchange in the lungs is ordinary ~ ...

According to the observation of the Monascus modality with solid state culture, combining simple ~ with active transportation a permeable model for the water's transportation is set up: the water molecules can pass phospholipid bilayer by simple ~ from the high flow to the low flow.

Studies of whole cell dynamics currently employ optical imaging of ~, generally through the use of steady state or dynamic photobleaching recovery methods. Associated with such studies is the need to label specific intracellular entities.

This approach allows ancestral traits to be estimated by combining a Brownian ~ process and correlations between substitution rates and life history traits.

For the reception and ~ of the weight each acetabular cavity is strengthened by two additional bars running toward the pubis and ischium.

Transport may occur by ~ and osmosis across the membrane. It can also occur when a vescicle attaches to the cell membrane from the inside and then opens to form a pocket, expelling its contents to the outside. This may be called exocytosis.

So this convoluted geometry can have flow through it, but for the interior cell clusters, the access of a nutrient is still controlled by ~.

In thin, simple aquatic organisms that are sedentary, gas exchange is simply by ~ through the "skin" or outer surface of the body. This type of gas exchange is typical of the sponges, Cnidaria, and flatworms.

Cell Biology - Membranes: concentration gradient, ~, hypertonic, hypotonic, isotonic, neurotransmitter, osmosis, passive transport, receptor, receptor protein, active site, resting potential, sodium-potassium pump, target cell, membrane potential ...

passive transport (facilitated ~) - 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 ~ or dispersion of the internal energy of the biomolecules towards more potential microstates.

10 Steps of Glycolysis
Cellular Respiration
~, Passive Transport, and Osmosis
DNA Transcription
Programmed Cell Death ...

Movin' on up the biological pyramid, we come to the smallest unit of life: the cell. This unit covers the properties and components of eukaryotes and prokaryotes, enzymes, osmosis and ~, and everyone's favorite cellular process: mitosis.
Unit 4. Biochemical Pathways ...

Studies of hybrid zones allow us to quantify the genetic differences responsible for speciation, to measure the ~ of genes between diverging taxa, and to understand the spread of alternative adaptations. (includes related information) Nature. V341. P497(7) Oct 12, 1989.

See also: See also: What is the meaning of Trans, Cells, Cell, Organ, Biology?

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