PHOTOKINESIS AND TONIC EFFECT OF LIGHT IN UNIONICOLA

1. The speed of progression of Unionicola, a water mite, is influenced by light; and over a certain range increases as a function of the light intensity. 2. The relation between speed and light intensity is not a simple one, as the speed of progression is due to the combined effect of amplitude of s...

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Detalles Bibliográficos
Autor principal: Welsh, John H.
Formato: Texto
Lenguaje:English
Publicado: The Rockefeller University Press 1932
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2141203/
https://www.ncbi.nlm.nih.gov/pubmed/19872710
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author Welsh, John H.
author_facet Welsh, John H.
author_sort Welsh, John H.
collection PubMed
description 1. The speed of progression of Unionicola, a water mite, is influenced by light; and over a certain range increases as a function of the light intensity. 2. The relation between speed and light intensity is not a simple one, as the speed of progression is due to the combined effect of amplitude of steps and frequency of leg movement. 3. The amplitude of stride increases in direct proportion to the logarithm of the light intensity, while the frequency of stepping has no such simple relation to intensity. 4. The change in length of stride with changing light intensity indicates a tonic effect of light on the locomotor muscles. Such an effect has been observed previously in studies of orientation, due to unequal illumination, which produces changes in posture.
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spelling pubmed-21412032008-04-23 PHOTOKINESIS AND TONIC EFFECT OF LIGHT IN UNIONICOLA Welsh, John H. J Gen Physiol Article 1. The speed of progression of Unionicola, a water mite, is influenced by light; and over a certain range increases as a function of the light intensity. 2. The relation between speed and light intensity is not a simple one, as the speed of progression is due to the combined effect of amplitude of steps and frequency of leg movement. 3. The amplitude of stride increases in direct proportion to the logarithm of the light intensity, while the frequency of stepping has no such simple relation to intensity. 4. The change in length of stride with changing light intensity indicates a tonic effect of light on the locomotor muscles. Such an effect has been observed previously in studies of orientation, due to unequal illumination, which produces changes in posture. The Rockefeller University Press 1932-11-20 /pmc/articles/PMC2141203/ /pubmed/19872710 Text en Copyright © Copyright, 1932, by The Rockefeller Institute for Medical Research This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/).
spellingShingle Article
Welsh, John H.
PHOTOKINESIS AND TONIC EFFECT OF LIGHT IN UNIONICOLA
title PHOTOKINESIS AND TONIC EFFECT OF LIGHT IN UNIONICOLA
title_full PHOTOKINESIS AND TONIC EFFECT OF LIGHT IN UNIONICOLA
title_fullStr PHOTOKINESIS AND TONIC EFFECT OF LIGHT IN UNIONICOLA
title_full_unstemmed PHOTOKINESIS AND TONIC EFFECT OF LIGHT IN UNIONICOLA
title_short PHOTOKINESIS AND TONIC EFFECT OF LIGHT IN UNIONICOLA
title_sort photokinesis and tonic effect of light in unionicola
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2141203/
https://www.ncbi.nlm.nih.gov/pubmed/19872710
work_keys_str_mv AT welshjohnh photokinesisandtoniceffectoflightinunionicola

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