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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

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.
References in periodicals archive ?
The Vibration Characteristics of the Buffering Device
According to the structural model, the finite element model of the buffering device was established using the ANSYS software package.
The working load of the buffering device depends on the falling speed of the solid backfill materials at the bottom of the feed shaft.
(3) Lack of cross-subsystem optimization: Separate buffering mechanisms make it difficult for individual subsystems to recognize opportunities for optimizations.
First, it extends the fbuf approach from the network subsystem to the file system, including the file data cache, thus unifying the buffering of I/O data throughout the system.
Multiple buffering occurs because a given document may simultaneously be stored in the file cache and in the TCP retransmission buffers of potentially multiple client connections.
All the latest implementations of NPS based real time systems follow the same trend for row buffering by using BRAMs as standard FPGA primitive.
OUR FPGA BASED EFFICIENT IMAGE BUFFERING ARCHITECTURE
This work proposes a compact and efficient image buffering architecture with an additional feature of pre-fetching data.
Despite the assumptions made here, the Dynamic Buffering scheme presented in this paper can be easily adapted to situations where more than one video is provided and encoded into multiple descriptions of different bit rates.
2 illustrates a general example of the Dynamic Buffering scheme.
2(a) to 2(c), it can be observed that the Dynamic Buffering scheme allows a peer to degrade it's service capacity gradually, rather than completely lose its service capability after its buffer is filled up with descriptions.