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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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

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.
Farlex Partner Medical Dictionary © Farlex 2012

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.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

buffer

Chemistry A chemical system that minimizes the effects, in particular the pH, of changes in the concentration of a substance
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

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.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
The effect of pH in the voltammetric response for of 20 [micro]mol [L.sup.-1] AML and 50 [micro]mol [L.sup.-1] ATOR on the anodically pretreated BDD electrode was investigated in the pH range 2.0-6.0, using a BR buffer solution. Table 1 presents the values of [I.sub.ap] of AML and ATOR in BR buffer at different pH values, as well as [DELTA][E.sup.ap] obtained by DPV experiments (a = 50 mV, v = 40 mV [s.sup.-1] and t = 5 mV).
The dried sample materials were allowed to remain immersed in buffer solution for 48 hours at 37[degrees]C temperature.
In this study, the obtained analytical curve was linear for the ticlopidine concentration range of 3.9 to 38.4 [micro]mol [L.sup.-1], with a detection limit of 0.66 [micro]mol [L.sup.-1] in Britton-Robinson (BR) buffer solution (pH 5.0).
Buffer solutions of pH 3-9 were prepared by this method but the solutions of pH 10 and 11 which are highly basic and prepared by adding sodium hydroxide solution (0.02 M).
To study the capacitance effect, buffer solutions were dropped onto a pH sensor without the alignment of SWNT.
In academia, the robust and durable balances are a suitable choice for all typical weighing processes, such as the preparation of buffer solutions for chemical analyses.
As part of their research, the Auburn investigators prepared phosphate buffer solutions (0.2 M) containing 0.2 M glycine and 0.2 M glucose at pH 6.8 to pH 7.7.
SR Sanitary Right Angle mixers are commonly used for media suspension and storage, buffer solutions, plasma extraction and fermentation, including bacteria and cell culture and general media processing applications.
For good separation and the simplicity of preparing buffer solutions, pH 9.2, the pH of 20 mmol L-1 borax at 25 oC, was selected as the optimum buffer pH.
Buffer solutions were prepared by mixing 1 M hydrochloric acid and 0.2 M sodium dihydrogen phosphate.