THE ACTION OF X-RAYS ON EUPLOTES TAYLORI AND ASSOCIATED BACTERIA

1. The minimum lethal dose of x-rays for Euplotes taylori was determined. Under the conditions of this investigation a 220 second exposure (2110 Roentgen units per second) was required to kill the protozoon. Much less exposure was sufficient to kill the associated bacteria. This difference in resist...

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Detalles Bibliográficos
Autores principales: Brown, Morden G., Luck, J. Murray, Sheets, Grace, Taylor, C. V.
Formato: Texto
Lenguaje:English
Publicado: The Rockefeller University Press 1933
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2141221/
https://www.ncbi.nlm.nih.gov/pubmed/19872714
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author Brown, Morden G.
Luck, J. Murray
Sheets, Grace
Taylor, C. V.
author_facet Brown, Morden G.
Luck, J. Murray
Sheets, Grace
Taylor, C. V.
author_sort Brown, Morden G.
collection PubMed
description 1. The minimum lethal dose of x-rays for Euplotes taylori was determined. Under the conditions of this investigation a 220 second exposure (2110 Roentgen units per second) was required to kill the protozoon. Much less exposure was sufficient to kill the associated bacteria. This difference in resistance permits the sterilization of protozoa with comparative ease. 2. Irradiation of Euplotes for 100 to 220 seconds caused a complete but temporary cessation of ciliary activity in many of the organisms, the percentage so affected increasing with the length of irradiation. 3. Pure cultures of Pseudomonas fluorescens and Bacillus coli, K (13), separately irradiated, were found to be killed much more readily than protozoa,—the former in 15 seconds exposure (2530 Roentgen units per second) and the latter in 45 seconds. 4. The death of these organisms by irradiation was not due to the action of toxic products in the medium since separately irradiated media were not found to be toxic. 5. Irradiated bacteria were found unsatisfactory for the nutrition of Euplotes, previously sterilized either by irradiation or washing.
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spelling pubmed-21412212008-04-23 THE ACTION OF X-RAYS ON EUPLOTES TAYLORI AND ASSOCIATED BACTERIA Brown, Morden G. Luck, J. Murray Sheets, Grace Taylor, C. V. J Gen Physiol Article 1. The minimum lethal dose of x-rays for Euplotes taylori was determined. Under the conditions of this investigation a 220 second exposure (2110 Roentgen units per second) was required to kill the protozoon. Much less exposure was sufficient to kill the associated bacteria. This difference in resistance permits the sterilization of protozoa with comparative ease. 2. Irradiation of Euplotes for 100 to 220 seconds caused a complete but temporary cessation of ciliary activity in many of the organisms, the percentage so affected increasing with the length of irradiation. 3. Pure cultures of Pseudomonas fluorescens and Bacillus coli, K (13), separately irradiated, were found to be killed much more readily than protozoa,—the former in 15 seconds exposure (2530 Roentgen units per second) and the latter in 45 seconds. 4. The death of these organisms by irradiation was not due to the action of toxic products in the medium since separately irradiated media were not found to be toxic. 5. Irradiated bacteria were found unsatisfactory for the nutrition of Euplotes, previously sterilized either by irradiation or washing. The Rockefeller University Press 1933-01-20 /pmc/articles/PMC2141221/ /pubmed/19872714 Text en Copyright © Copyright, 1933, 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
Brown, Morden G.
Luck, J. Murray
Sheets, Grace
Taylor, C. V.
THE ACTION OF X-RAYS ON EUPLOTES TAYLORI AND ASSOCIATED BACTERIA
title THE ACTION OF X-RAYS ON EUPLOTES TAYLORI AND ASSOCIATED BACTERIA
title_full THE ACTION OF X-RAYS ON EUPLOTES TAYLORI AND ASSOCIATED BACTERIA
title_fullStr THE ACTION OF X-RAYS ON EUPLOTES TAYLORI AND ASSOCIATED BACTERIA
title_full_unstemmed THE ACTION OF X-RAYS ON EUPLOTES TAYLORI AND ASSOCIATED BACTERIA
title_short THE ACTION OF X-RAYS ON EUPLOTES TAYLORI AND ASSOCIATED BACTERIA
title_sort action of x-rays on euplotes taylori and associated bacteria
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2141221/
https://www.ncbi.nlm.nih.gov/pubmed/19872714
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