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THE INFLUENCE OF THE INTENSITY OF LIGHT ON THE RATE OF GROWTH AND DURATION OF LIFE OF DROSOPHILA

The duration of the larval and imago periods of Drosophila cultures which had been previously grown in the dark for 200 generations has been determined at various light intensities. 1. The duration of the larval period is shortened slightly at intensities around 2,500 meter candles, but becomes incr...

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Detalles Bibliográficos
Autor principal: Northrop, John H.
Formato: Texto
Lenguaje:English
Publicado: The Rockefeller University Press 1925
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2140775/
https://www.ncbi.nlm.nih.gov/pubmed/19872234
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author Northrop, John H.
author_facet Northrop, John H.
author_sort Northrop, John H.
collection PubMed
description The duration of the larval and imago periods of Drosophila cultures which had been previously grown in the dark for 200 generations has been determined at various light intensities. 1. The duration of the larval period is shortened slightly at intensities around 2,500 meter candles, but becomes increasingly longer at higher intensities. The larvæ are killed by continuous exposure to light of 7,000 to 10,000 meter candles. 2. The pupæ are killed at intensities greater than 5,000 meter candles. 3. Above 1,000 meter candles the duration of the imago period is rapidly shortened. 4. The duration of life of the imago at different intensities of illumination can be quite accurately predicted by assuming that the light produces an independent "rate of aging" which is proportional to the intensity of the light. 5. The result of short exposure of the imago shows that light does not merely accelerate the normal "rate of aging," and also that the effect is only partially reversible. Diffuse daylight does not affect the upper temperature limit of growth.
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spelling pubmed-21407752008-04-23 THE INFLUENCE OF THE INTENSITY OF LIGHT ON THE RATE OF GROWTH AND DURATION OF LIFE OF DROSOPHILA Northrop, John H. J Gen Physiol Article The duration of the larval and imago periods of Drosophila cultures which had been previously grown in the dark for 200 generations has been determined at various light intensities. 1. The duration of the larval period is shortened slightly at intensities around 2,500 meter candles, but becomes increasingly longer at higher intensities. The larvæ are killed by continuous exposure to light of 7,000 to 10,000 meter candles. 2. The pupæ are killed at intensities greater than 5,000 meter candles. 3. Above 1,000 meter candles the duration of the imago period is rapidly shortened. 4. The duration of life of the imago at different intensities of illumination can be quite accurately predicted by assuming that the light produces an independent "rate of aging" which is proportional to the intensity of the light. 5. The result of short exposure of the imago shows that light does not merely accelerate the normal "rate of aging," and also that the effect is only partially reversible. Diffuse daylight does not affect the upper temperature limit of growth. The Rockefeller University Press 1925-09-20 /pmc/articles/PMC2140775/ /pubmed/19872234 Text en Copyright © Copyright, 1925, 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
Northrop, John H.
THE INFLUENCE OF THE INTENSITY OF LIGHT ON THE RATE OF GROWTH AND DURATION OF LIFE OF DROSOPHILA
title THE INFLUENCE OF THE INTENSITY OF LIGHT ON THE RATE OF GROWTH AND DURATION OF LIFE OF DROSOPHILA
title_full THE INFLUENCE OF THE INTENSITY OF LIGHT ON THE RATE OF GROWTH AND DURATION OF LIFE OF DROSOPHILA
title_fullStr THE INFLUENCE OF THE INTENSITY OF LIGHT ON THE RATE OF GROWTH AND DURATION OF LIFE OF DROSOPHILA
title_full_unstemmed THE INFLUENCE OF THE INTENSITY OF LIGHT ON THE RATE OF GROWTH AND DURATION OF LIFE OF DROSOPHILA
title_short THE INFLUENCE OF THE INTENSITY OF LIGHT ON THE RATE OF GROWTH AND DURATION OF LIFE OF DROSOPHILA
title_sort influence of the intensity of light on the rate of growth and duration of life of drosophila
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2140775/
https://www.ncbi.nlm.nih.gov/pubmed/19872234
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