buffer


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buffer

 [buf´er]
a substance that, by its presence in solution, increases the amount of acid or alkali necessary to produce a unit change in pH. The bicarbonate buffer system in the blood maintains a balance between bicarbonate and carbon dioxide ions and deterimnes the pH of the blood.

buff·er

(bŭf'ĕr),
1. A mixture of an acid and its conjugate base (salt), such as H2CO3 or HCO3-; H2PO4-/HPO42-, that, when present in a solution, reduces any changes in pH that would otherwise occur in the solution when acid or alkali is added to it; thus, the pH of the blood and body fluids is kept relatively constant (pH 7.45) although acid metabolites are continually being formed in the tissues and CO2 is lost in the lungs.
See also: conjugate acid-base pair.
2. To add a buffer to a solution and thus give it the property of resisting a change in pH when it receives a limited amount of acid or alkali.

buffer

/buf·fer/ (buf´er)
1. a chemical system that prevents changes in hydrogen ion concentration.
2. a physical or physiological system that tends to maintain constancy.

buffer

Etymology: ME, buffe, to cushion
a substance or group of substances that tends to control the hydrogen ion concentration in a solution by reacting with hydrogen ions of an acid added to the system and releasing hydrogen ions to a base added to the system. Buffers minimize significant changes of pH in a chemical system. Among the functions carried out by buffer systems in the body is maintenance of the acid-base balance of the blood and of the proper pH in kidney tubules. See also blood buffers, pH.

buffer

Chemistry
(1) A chemical system that minimises the effects—in particular the pH—of changes in the concentration of a substance.

(2) A molecule that serves to prevent large changes in pH by either combining with H+ or by releasing H+ into solution. 

(3) A system that minimises the changes in specific chemical species in solution against addition or depletion of the species.

(4) pH buffers: weak acids or weak bases in aqueous solution. The working range is given by pKa +/ 1.

(5) Metal ion buffers: a metal ion chelator (e.g., EDTA), partially saturated by the metal ion acts, as a buffer for the metal ion.

Computers
A storage zone that “resides” temporarily in the RAM (random access memory) and contains either input or output data, remaining there while waiting for an output (or less commonly, an input) device—e.g., a printer—to allow it access to perform a function. Buffer sizes can be increased with “spooling” software or by increased the printer’s RAM.
 
Drug slang
Regional street drug slang for a crack smoker or a woman who exchanges oral sex for crack.
 
Molecular biology
 A solution containing agents which maintain a constant pH during a biochemical reaction.
 
Vox populi
A person who acts as a go-between.

buffer

Chemistry A chemical system that minimizes the effects, in particular the pH, of changes in the concentration of a substance

buff·er

(bŭf'ĕr)
1. A mixture of an acid and its conjugate base (salt), such as H2CO3/HCO3; H2PO4/ HPO42-, which, when present in a solution, resists changes in pH that would otherwise occur in the solution when acid or alkali is added to it.
See also: conjugate acid-base pair
2. To add a buffer to a solution and thus give it the property of resisting a change in pH.

buffer

a chemical substance which has the capacity to bond to H+ ions, removing them from solution when their concentration begins to rise and releasing H+ ions when their concentration begins to fall. In this way buffers stabilize the pH of biological solutions and are thus important in maintaining HOMEOSTASIS. HAEMOGLOBIN is an excellent example of a buffer, maintaining a stable pH in the ERYTHROCYTE.

buffer,

n a substance in a fluid that tends to lessen the change in hydrogen ion concentration that otherwise would be produced by adding acids or alkalis.
References in periodicals archive ?
In first one she mentioned due to the manner of the RED algorithm it maps the buffer occupancy levels onto packet drop probabilities and it will naturally flawed.
In figure 2, the forces that appear when passing through curves with a 150 m radius are presented, when the dimension between the centers of the buffers is 19.
Ascending order: Buffer capacity concentrated at end of line.
Now we know that a restored riparian forest buffer can be just as effective for phosphorus removal," says Lowrance.
When a signal is raised for replenishment, the order quantity is whatever amount is required to bring the buffer up to 100%.
Seawater, urine, and rabbit serum used unmodified or diluted in buffer (PBS), and enriched with varying quantities of PbTxs before analyses, led to results more favorable than those obtained in pure buffer.
AMERCIAN FORESTS' GLOBAL ReLeaf Forest there is establishing a forest buffer along an agricultural ditch that flows into the Little Annerriessex River, a major tributary of Chesapeake Bay Increasing fruit and mast production and widening the riparian travel corridor will improve habitat for upland game and nongame birds and mammals.
But once in the system, materials are pushed quickly in small transfer batches to the targeted stock or time buffer locations.
The spatial filter is then centered on Edmonson County and a buffer of 5 km is drawn.
Utilities, such as print buffers and V-disks, also can be loaded into this type of memory.
The Si533xx clock buffer family is part of Silicon Labs' comprehensive portfolio of timing devices, enabling customers to simplify both the design and procurement of complete clock tree solutions for virtually any high-performance application.
Dna extraction kit high purity , containing: genomic lysing buffer (genomic lysis buffer), pre-wash buffer dna (dna pre-wash buffer) dna wash buffer (g-wash buffer dna) dna elution buffer (dna- elution buffer), c,simple microtubes (thin wall 0 2ml) for standard pcr reaction in 25ul total volume containing the following reagents and by microtube: lyophilized microspheres (for storage at room temperature) containing: 2.