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Distribution and Dispersion

Distribution and Dispersion

Ecology is the study of how organisms interact with their environment and with one another. An important aspect of ecology is understanding where species are found and how individuals are distributed within those areas. The geographic range of a species refers to the total area where its members are located, while dispersion describes the pattern of spacing of individuals within that range.Geographic Range and Dispersion PatternsWithin a species’ geographic range, individuals may be distributed...

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Updated: Jun 6, 2026

Dispersion of Nanomaterials in Aqueous Media: Towards Protocol Optimization

Dispersion of Nanomaterials in Aqueous Media: Towards Protocol Optimization

Published on: December 25, 2017

Quantitative dispersion microscopy.

Dan Fu¹, Wonshik Choi, Yongjin Sung

¹G.R.Harrison Spectroscopy Laboratory, Masachusetts Institute of Technology. Cambridge, Massachusetts 02139, USA.

Biomedical Optics Express

|November 30, 2010

Summary

This summary is machine-generated.

We developed a new technique called dispersion phase imaging to measure the refractive index dispersion of living cells. This method quantifies optical properties, aiding in distinguishing biomaterials and understanding cellular structures.

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Area of Science:

Biophysics
Optical Imaging
Cell Biology

Background:

Refractive index dispersion is a key optical property for biological imaging.
Existing methods lack the ability to measure dispersion in living cells.

Purpose of the Study:

To present the first dispersion phase imaging of living eukaryotic cells.
To develop a quantitative dispersion microscopy technique for live cell analysis.

Main Methods:

Developed quantitative dispersion microscopy based on quantitative phase microscopy.
Utilized a dual-wavelength quantitative phase microscope (310 nm and 400 nm).
Measured phase at two wavelengths to quantify refractive index increment ratio (dispersion).

Main Results:

Successfully performed dispersion phase imaging on living eukaryotic cells.
Measured the dispersion of living HeLa cells to be approximately 1.088.
Results align with direct measurements of protein solutions.

Conclusions:

Quantitative dispersion microscopy is a viable tool for live cell imaging.
This technique, combined with dry mass and morphology data, can differentiate biomaterials.
It offers insights into spatial inhomogeneities within biological samples.