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Related Concept Videos

Buffer Effectiveness02:19

Buffer Effectiveness

47.6K
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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Buffer Systems in the Body01:19

Buffer Systems in the Body

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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...
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Buffers: Overview01:30

Buffers: Overview

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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).
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Calculating pH Changes in a Buffer Solution02:45

Calculating pH Changes in a Buffer Solution

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A buffer can prevent a sudden drop or increase in the pH of a solution after the addition of a strong acid or base up to its buffering capacity; however, such addition of a strong acid or base does result in the slight pH change of the solution. The small pH change can be calculated by determining the resulting change in the concentration of buffer components, i.e., a weak acid and its conjugate base or vice versa. The concentrations obtained using these stoichiometric calculations can be used...
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Introduction to Solid Supported Membrane Based Electrophysiology
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Developing suitable buffers to capture transport cycling behavior.

Thomas Madsen1, Jasper Schipperijn1, Lars Breum Christiansen1

  • 1Department of Sport Science and Clinical Biomechanics, University of Southern Denmark , Odense , Denmark.

Frontiers in Public Health
|June 14, 2014
PubMed
Summary
This summary is machine-generated.

Defining neighborhood boundaries is crucial for understanding the built environment's impact on transport cycling. Ellipse-shaped buffers, directed towards the city center, better capture cycling behavior than traditional home-based buffers.

Keywords:
GPSMAUPbuffersbuilt environmentcyclingphysical activitytransport

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Area of Science:

  • Urban Planning
  • Environmental Health
  • Transportation Science

Background:

  • The relationship between neighborhood built environments and cycling is well-documented but lacks consistent neighborhood definitions.
  • Traditional administrative or home-based neighborhood buffers may not accurately reflect actual environmental exposures for cycling.
  • A clearer understanding of appropriate spatial units is needed to accurately assess the built environment's influence on transport cycling.

Purpose of the Study:

  • To develop and test various neighborhood buffer types for accurately capturing transport cycling behavior.
  • To evaluate the effectiveness of different buffer shapes and origins in representing cycling exposure.
  • To identify the most suitable neighborhood definition for linking the built environment with transport cycling.

Main Methods:

  • Utilized Global Positioning System (GPS) cycling tracks from 78 participants over 7 days.
  • Developed and compared several neighborhood buffer types: home-based network buffers, shortest route to city center buffers, and city center-directed ellipse-shaped buffers.
  • Assessed buffer effectiveness using the percentage of GPS points per square meter.

Main Results:

  • GPS tracks effectively illustrate daily movement patterns, aiding in linking built environments with cycling behavior.
  • Cycling track elongation increased with greater distance from the city center.
  • City center-directed ellipse-shaped buffers demonstrated superior effectiveness in capturing transport cycling behavior compared to traditional home-based network buffers.

Conclusions:

  • Accurate assessment of physical activity requires defining neighborhoods that reflect actual usage patterns.
  • For transport cycling, with its extensive reach, ellipse-shaped buffers directed towards the city center are more effective than conventional home-based buffers.
  • Ellipse-shaped buffers offer a promising alternative to traditional buffers for future transport cycling behavior studies.