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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 ?
By way of a buffer overflow in the Host header part of the request, the intruder can transfer arbitrary code to the system stack and have it execute in the security context of the Local System.
The evidence comes from one of the most dangerous but most underestimated vulnerabilities, the buffer overflow.
Before this vulnerability was announced, customers of ISS' host-based security products were shielded from it by the company's buffer overflow exploit prevention technology.
IntelliClear was commissioned by Intel Corporation to conduct the worldwide study, which focused on a number of processor-based technologies for PCs that deliver significant benefits to small businesses such as: automatic anti-virus updates and remote management via Intel Active Management Technology(R); buffer overflow and worm virus protection via Intel Execute Disable Bit(R); secure computing without efficiency degradation or the threat of security software tampering via increased processor performance; improved data reliability and redundancy via Intel Matrix Storage Technology(R) combined with a second hard drive; and organizational efficiency gains through the use of PC-based voice over Internet protocol (VoIP).
Vulnerability analysis specifically tests applications for software defects and other weaknesses such as buffer overflows.
The list - in order of the most critical threat - includes Unvalidated Parameters, Broken Access Control, Broken Account and Session Management, Cross-Site Scripting (XSS) Flaws, Buffer Overflows, Command Injection Flaws, Error Handling Problems, Insecure Use of Cryptography, Remote Administration Flaws and Web and Application Server Misconfiguration.
NFR's flagship Sentivist Real-Time Threat Protection solution protects against all manner of attacks, including intrusion attacks, insidious zero-day attacks, anomaly exploits, malicious code, backdoors, command tampering, polymorphic buffer overflows and more.
The five zero day buffer overflows were uncovered by Safend's R&D team while testing Safend Protector 3.