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Related Concept Videos

Phase Contrast and Differential Interference Contrast Microscopy01:26

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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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Three-dimensional imaging techniques are essential in cell biology, allowing researchers to visualize intricate cellular structures with high resolution. Two prominent methods, Differential Interference Contrast Microscopy (DIC) and Confocal Scanning Laser Microscopy (CSLM), provide distinct advantages for imaging live and thick specimens, respectively.Differential Interference Contrast MicroscopyDIC microscopy enhances contrast in transparent, unstained samples by converting phase...
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Related Experiment Video

Updated: Nov 18, 2025

In vitro Synthesis of Native, Fibrous Long Spacing and Segmental Long Spacing Collagen
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Measuring collagen fibril diameter with differential interference contrast microscopy.

Seyed Mohammad Siadat1, Alexandra A Silverman1, Charles A DiMarzio2

  • 1Department of Bioengineering, Northeastern University, Boston, MA 02115, USA.

Journal of Structural Biology
|February 5, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a new optical method using differential interference contrast (DIC) microscopy to accurately measure collagen fibril diameter. This non-destructive technique allows for better understanding of fibril dynamics in load-bearing tissues.

Keywords:
Collagen fibril diameterDIC edge intensity shiftDifferential interference contrast MicroscopySEMTEM

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Area of Science:

  • Biophysics
  • Materials Science
  • Microscopy

Background:

  • Collagen fibrils are essential structural units in load-bearing tissues.
  • Imaging individual fibril dynamics is challenging due to limitations of visible light microscopy.
  • Fibril diameter is a key parameter, difficult to measure accurately, dynamically, and non-destructively.

Purpose of the Study:

  • To develop and validate a non-destructive optical method for measuring collagen fibril diameter.
  • To establish a correlation between collagen fibril dimensions and differential interference contrast (DIC) microscopy signals.
  • To enable in situ, dynamic analysis of collagen fibril behavior.

Main Methods:

  • Utilized differential interference contrast (DIC) microscopy to visualize nanometer-scale objects.
  • Generated a calibration curve relating collagen fibril diameter to DIC edge intensity shift (DIC-EIS).
  • Calibrated the DIC-EIS curve using electron microscopy for validation.

Main Results:

  • Demonstrated a linear correlation between collagen fibril diameter and DIC-EIS.
  • Achieved accurate measurements of collagen fibril diameters (100-300 nm) with ±11 nm (dehydrated) and ±4 nm (hydrated) accuracy.
  • Validated the method using electron microscopy.

Conclusions:

  • Differential interference contrast (DIC) microscopy provides a simple, label-free, and non-destructive method for measuring collagen fibril diameter.
  • This technique advances the ability to study fibril dynamics under physiologically relevant conditions.
  • The method facilitates research into the mechanics, growth, and remodeling of collagenous tissues.