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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 ?
0 -- BcBS = bicarbonate buffer solution; DEABS = diethanolamine buffer solution; and MEABS = methylaminoethanol buffer solution.
eq] are the buffer solution amount absorbed by the polymeric network at the predetermined t time and respectively at equilibrium; n is the diffusion exponent, which is indicative for the swelling mechanism (21).
Minimum swelling degree was ensured by minimizing the free functional groups in contact with buffer solution.
The swelling kinetics of the analyzed samples evidences different behavior of water diffusion into the polymeric network meshes for hydrogels with high content of pNIPAM against of hydrogels with 70-85% PAS content when the buffer solution infused the network at a lower rate.
Overall, these results indicate that the interference caused by the declining absorbance of HBOC at 415 nm is attributable to a pH effect rather than a chemical interaction between blood substitute and components of the buffer solution.
The electrode was then washed with buffer solution for 30 s.
The probe was then rinsed in the 2x SSC buffer solution, immersed into the stirred daunomycin solution for 2 min at room temperature in the dark, and then washed with the buffer solution.
Figure 11 shows the in vitro release behaviors of DOX-loaded LHRH-PEG-PHIS micelles in three different buffer solutions (pH 5.
A fixed amount of DOX-loaded micelle solution suspended in dialysis bags was placed into PBS buffer solution with different pH value (pH 5.
The samples were then allowed to swell in a sealed Petri dish with 30mL of buffer solution pH 7.
John Crison, director of life sciences for Simulations Plus, said: "The solubility of new drug molecules is usually measured in laboratory experiments either in pure water or in buffer solutions.
8899 g of 3-(2-pyridyl)-5,6-bis(2-[5-furylsulfonic acid])-1,2,4-triazine was dissolved in 100 mL of buffer solution.