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 ?
The system creates Output Areas that each contain around 125 households and so are about one-third smaller in population size than the average ED in 1991.
4m for its Communities First Partnerships, the lower super output areas (LSOA) and central support team.
An analysis of indicators used to build the Welsh Index of Multiple Deprivation shows that the percentage of the population who have been convicted of a crime has increased in more than half of the nation's Lower Super Output Areas (LSOAs).
The key output areas of the project are: Output 1: Strengthened citizen voice and interaction with the state to improve demand, awareness and accountability for service delivery, particularly for vulnerable groups.
More than half the Lower Super Output Areas (LSOAs) in Wales - which contain around 1,000 people - have seen an increase in the percentage of the population who have been convicted of a crime and burglary rates have risen in 40% of them.
Of those lower super output areas that were in the most deprived 10% last time, 23 have improved enough to get out of the lowest group.
These new areas - known as lower layer super output areas (LSOA) - contain about 1,500 people each and each ward may contain a number of them.
The cuts will include up to 172 posts from programme-making content and output areas, 30 jobs from non programme-making professional services areas, and the loss of the entire arts department.
Andrew de Pass, chief executive at Conergy, said the facility would help the company execute a global growth plan in solar with the company looking to expand specifically into bidding, pre-construction, construction and output areas of the industry.
To further both HECA and Affordable Warmth and to reduce the impact of cold, damp homes on the health of residents, Wirral Council requires a supplier to deliver support to fuel poor households in four Lower Super Output Areas (LSOAs) in the Borough which are the focus of selective licensing of the private rented sector (see Appendix 1 for location map).
Design and equipment production and output areas as part of the to be planned and to be implemented concept.
However, preference will be given to long-term unemployed living within the top 20 % Super Output Areas (SOA~s).