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Related Concept Videos

Buffers02:56

Buffers

A solution containing appreciable amounts of a weak conjugate acid-base pair is called a buffer solution, or a buffer. Buffer solutions resist a change in pH when small amounts of a strong acid or a strong base are added. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl...
Buffer Systems in the Body01:19

Buffer Systems in the Body

Chemical buffers play a critical role in the body's regulation of pH levels. These systems contain one or more compounds that stabilize pH changes by neutralizing strong acids or bases. When pH levels drop, hydrogen ions bind to a weak base; when pH levels rise, hydrogen ions are released. This dynamic process helps maintain pH within a narrow and stable range essential for normal physiological function.
A typical buffer system in bodily fluids includes a weak acid and its corresponding anion,...
Buffers: Overview01:30

Buffers: Overview

Buffers play a crucial role in stabilizing the pH of a solution by mitigating the effects of small amounts of added acid or base. They consist of a weak acid and its conjugate base or a weak base and its conjugate acid. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl (aq).
Buffers: Buffer Capacity01:09

Buffers: Buffer Capacity

Buffer capacity is the quantitative measure of a buffer to resist the change in pH. As shown in the following equation, the buffer capacity, denoted by 'beta', is expressed as the number of moles of acid or base needed to change the pH of a one-liter buffer solution by 1 unit. Here, Ca and Cb indicate the number of moles of acid and base, respectively. Note that dpH represents the change in pH.
In the graph, pH is plotted as a function of the number of moles of base (Cb) added to a weak acid...
Phosphate Buffer01:22

Phosphate Buffer

The phosphate buffer system is a critical biological mechanism for maintaining pH stability in the body. This system operates primarily through two components: sodium dihydrogen phosphate (NaH2PO4), which acts as a weak acid, and sodium hydrogen phosphate (Na2HPO4), which serves as a weak base.
Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...
Buffer Effectiveness02:19

Buffer Effectiveness

Buffer solutions do not have an unlimited capacity to keep the pH relatively constant . Instead, the ability of a buffer solution to resist changes in pH relies on the presence of appreciable amounts of its conjugate weak acid-base pair. When enough strong acid or base is added to substantially lower the concentration of either member of the buffer pair, the buffering action within the solution is compromised.
The buffer capacity is the amount of acid or base that can be added to a given volume...

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Measuring Phagosome pH by Ratiometric Fluorescence Microscopy
14:39

Measuring Phagosome pH by Ratiometric Fluorescence Microscopy

Published on: December 7, 2015

Media composition: pH and buffers.

Jason E Swain1

  • 1University of Michigan, Ann Arbor, MI, USA. swainj@umich.edu

Methods in Molecular Biology (Clifton, N.J.)
|July 26, 2012
PubMed
Summary
This summary is machine-generated.

Maintaining proper media pH is vital for successful gamete and embryo culture. This study details pH regulation, oscillation prevention, and accurate measurement techniques to optimize development and reduce stress.

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Area of Science:

  • Reproductive biology and developmental science.
  • Biochemistry and cell physiology.

Background:

  • Optimizing gamete and embryo culture requires precise control of the extracellular environment.
  • Media pH significantly impacts cellular function, intracellular stress, and developmental potential.

Purpose of the Study:

  • To highlight the critical role of media pH in assisted reproductive technologies.
  • To discuss strategies for regulating and stabilizing extracellular pH (pHe) and intracellular pH (pHi).
  • To outline methods for accurate pHe measurement in culture media.

Main Methods:

  • Review of established protocols for pH control in cell culture.
  • Discussion of physiological mechanisms governing pH homeostasis.
  • Description of techniques for monitoring and maintaining stable pHe.

Main Results:

  • Proper media pH selection and stabilization are key to minimizing cellular stress.
  • Preventing harmful extracellular pH oscillations is crucial for optimal gamete and embryo development.
  • Accurate pHe measurement is essential for reliable culture outcomes.

Conclusions:

  • Precise control and monitoring of media pH are indispensable for effective gamete and embryo culture.
  • Understanding and managing pH dynamics can significantly improve reproductive outcomes.
  • Adherence to best practices in pH management enhances the efficacy of assisted reproduction techniques.