Phototaxigraph: Recording Instrument for Determination of Rate of Response of Phototactic Microorganisms to Light of Controlled Intensity and Wavelength

An instrument has been developed which measures the rate of phototaxis in a suspension of microorganisms by recording the increase in optical density which results when the organisms accumulate in a beam of stimulating light. Intensity and spectral quality of the actinic light, as well as of randoml...

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Bibliographic Details
Published in:Review of scientific instruments 1965-12, Vol.36 (12), p.1721-1725
Main Authors: Lindes, DeArmond, Diehn, Bodo, Tollin, Gordon
Format: Article
Language:English
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Summary:An instrument has been developed which measures the rate of phototaxis in a suspension of microorganisms by recording the increase in optical density which results when the organisms accumulate in a beam of stimulating light. Intensity and spectral quality of the actinic light, as well as of randomly scattered background illumination, can be controlled. Density changes are measured with a dual chopped beam arrangement using infrared light. Thermostatic control of the temperature of the sample is provided.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1719450