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Related Concept Videos

Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Related Experiment Video

Updated: Jun 16, 2026

Measuring the Shape and Size of Activated Sludge Particles Immobilized in Agar with an Open Source Software Pipeline
09:27

Measuring the Shape and Size of Activated Sludge Particles Immobilized in Agar with an Open Source Software Pipeline

Published on: January 30, 2019

A Comparison between bright field and phase-contrast image analysis techniques in activated sludge morphological

D P Mesquita1, O Dias, A L Amaral

  • 1Institute for Biotechnology and Bioengineering, Centre of Biological Engineering, Universidade do Minho, Braga, Portugal.

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|January 27, 2010
PubMed
Summary

Bright field microscopy is a simple, inexpensive, and effective method for characterizing activated sludge systems. This technique provided the best overall results compared to phase-contrast microscopy in wastewater treatment plants.

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Last Updated: Jun 16, 2026

Measuring the Shape and Size of Activated Sludge Particles Immobilized in Agar with an Open Source Software Pipeline
09:27

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Published on: January 30, 2019

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Published on: June 28, 2017

Area of Science:

  • Environmental Science
  • Microscopy
  • Wastewater Treatment

Background:

  • Activated sludge systems are crucial for wastewater treatment.
  • Microscopy image analysis is vital for characterizing these systems.
  • Various visualization and acquisition methods exist for data collection.

Purpose of the Study:

  • To compare bright field and phase-contrast microscopy for activated sludge characterization.
  • To evaluate the advantages and disadvantages of each acquisition technique.

Main Methods:

  • Acquisition of images from seven wastewater treatment plants over two years.
  • Comparison of bright field and phase-contrast microscopy techniques.
  • Analysis of image data for system characterization.

Main Results:

  • Bright field microscopy is simpler and more cost-effective.
  • Bright field microscopy yielded superior overall results.
  • Phase-contrast microscopy has specific applications but was not overall superior.

Conclusions:

  • Bright field microscopy is recommended for routine activated sludge characterization.
  • The choice of microscopy technique impacts the efficiency and cost of wastewater treatment analysis.
  • Further studies could explore other advanced imaging techniques.