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Related Experiment Video

Updated: Jun 19, 2026

Measuring the Effects of Bacteria and Chemicals on the Intestinal Permeability of Caenorhabditis elegans

Measuring the Effects of Bacteria and Chemicals on the Intestinal Permeability of Caenorhabditis elegans

Published on: December 3, 2019

THE EFFECT OF LIGHT ON THE PERMEABILITY OF PARAMECIUM.

¹Institute of Cancer Research of Columbia University, New York.

The Journal of General Physiology

|October 30, 2009

Summary

Light exposure increases Paramecium permeability to ammonium hydroxide (NH4OH). This effect is wavelength-dependent, being strongest in ultraviolet light, and intensifies with longer exposure times.

Area of Science:

Cell biology
Photobiology
Physiology

Background:

Paramecium is a widely studied protozoan model organism.
Cell membrane permeability is crucial for physiological processes.
The effect of light on cellular permeability is not fully understood.

Purpose of the Study:

To investigate the influence of light on the permeability of Paramecium cells.
To determine the relationship between light wavelength and permeability changes.
To assess the impact of light exposure duration on permeability.

Main Methods:

Experiments were conducted on Paramecium cells.
Cell permeability to ammonium hydroxide (NH4OH) was measured under varying light conditions (darkness vs. light).
Monochromatic light of different wavelengths, including red and near-ultraviolet, was used.

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Flash Photolysis of Caged Compounds in the Cilia of Olfactory Sensory Neurons

Published on: October 29, 2011

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Last Updated: Jun 19, 2026

Measuring the Effects of Bacteria and Chemicals on the Intestinal Permeability of Caenorhabditis elegans

Measuring the Effects of Bacteria and Chemicals on the Intestinal Permeability of Caenorhabditis elegans

Published on: December 3, 2019

Preparation of Light-responsive Membranes by a Combined Surface Grafting and Postmodification Process

Preparation of Light-responsive Membranes by a Combined Surface Grafting and Postmodification Process

Published on: March 21, 2014

Flash Photolysis of Caged Compounds in the Cilia of Olfactory Sensory Neurons

Flash Photolysis of Caged Compounds in the Cilia of Olfactory Sensory Neurons

Published on: October 29, 2011

Main Results:

Paramecium cells exhibited significantly greater NH4OH permeability when exposed to light compared to darkness.
The permeability increase was observed with red light but was more pronounced at shorter wavelengths, peaking in the near-ultraviolet spectrum.
Increased duration of light exposure correlated with a higher degree of permeability.

Conclusions:

Light significantly modulates the permeability of Paramecium cells to NH4OH.
Wavelength and duration of light exposure are critical factors influencing this permeability change.
Controlling illumination is essential for accurate physiological studies using Paramecium.