Radiation resistance and injury of Yersinia enterocolitica [Food contaminants]
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| Published in | Applied and Environmental Microbiology Vol. 37; no. 1; pp. 50 - 54 |
|---|---|
| Main Authors | , |
| Format | Journal Article |
| Language | English |
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United States
American Society for Microbiology
1979
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| AbstractList | The
D
values of
Yersinia enterocolitica
strains IP134, IP107, and WA, irradiated at 25 C in Trypticase soy broth, ranged from 9.7 to 11.8 krad. When irradiated in ground beef at 25 and −30 C, the
D
value of strain IP107 was 19.5 and 38.8 krad, respectively. Cells suspended in Trypticase soy broth were more sensitive to storage at −20 C than those mixed in ground beef. The percentages of inactivation and of injury (inability to form colonies in the presence of 3.0% NaCl) of cells stored in ground beef for 10 days at −20 C were 70 and 23%, respectively. Prior irradiation did not alter the cell's sensitivity to storage at −20 C, nor did storage at −20 C alter the cell's resistance to irradiation at 25 C. Added NaCl concentrations of up to 4.0% in Trypticase soy agar (TSA) (which contains 0.5% NaCl) had little effect on colony formation at 36 C of unirradiated
Y. enterocolitica.
With added 4.0% NaCl, 79% of the cells formed colonies at 36 C; with 5.0% NaCl added, no colonies were formed. Although 2.5% NaCl added to ground beef did not sensitize
Y. enterocolitica
cells to irradiation, when added to TSA it reduced the number of apparent radiation survivors. Cells uninjured by irradiation formed colonies on TSA when incubated at either 36 or 5 C. More survivors of an exposure to 60 krad were capable of recovery and forming colonies on TSA when incubated at 36 C for 1 day than at 5 C for 14 days. This difference in count was considered a manifestation of injury to certain survivors of irradiation. The D values of Yersinia enterocolitica strains IP134, IP107, and WA, irradiated at 25 degrees C in Trypticase soy broth, ranged from 9.7 to 11.8 krad. When irradiated in ground beef at 25 and -30 degrees C, the D value of strain IP107 was 19.5 and 38.8 krad, respectively. Cells suspended in Trypticase soy broth were more sensitive to storage at -20 degrees C than those mixed in ground beef. The percentages of inactivation and of injury (inability to form colonies in the presence of 3.0% NaCl) of cells stored in ground beef for 10 days at -20 degrees C were 70 and 23%, respectively. Prior irradiation did not alter the cell's sensitivity to storage at -20 degrees C, nor did storage at -20 degrees C alter the cell's resistance to irradiation at 25 degrees C. Added NaCl concentrations of up to 4.0% in Trypticase soy agar (TSA) (which contains 0.5% NaCl) had little effect on colony formation at 36 degrees C of unirradiated Y. enterocolitica. With added 4.0% NaCl, 79% of the cells formed colonies at 36 degrees C; with 5.0% NaCl added, no colonies were formed. Although 2.5% NaCl added to ground beef did not sensitize Y. enterocolitica cells to irradiation, when added to TSA it reduced the number of apparent radiation survivors. Cells uninjured by irradiation formed colonies on TSA when incubated at either 36 or 5 degrees C. More survivors of an exposure to 60 krad were capable of recovery and forming colonies on TSA when incubated at 36 degrees C for 1 day than at 5 degrees C for 14 days. This difference in count was considered a manifestation of injury to certain survivors of irradiation. Classifications Services AEM Citing Articles Google Scholar PubMed Related Content Social Bookmarking CiteULike Delicious Digg Facebook Google+ Mendeley Reddit StumbleUpon Twitter current issue Spotlights in the Current Issue AEM About AEM Subscribers Authors Reviewers Advertisers Inquiries from the Press Permissions & Commercial Reprints ASM Journals Public Access Policy AEM RSS Feeds 1752 N Street N.W. • Washington DC 20036 202.737.3600 • 202.942.9355 fax • journals@asmusa.org Print ISSN: 0099-2240 Online ISSN: 1098-5336 Copyright © 2014 by the American Society for Microbiology. For an alternate route to AEM .asm.org, visit: AEM The D values of Yersinia enterocolitica strains IP134, IP107, and WA, irradiated at 25°C in Trypticase soy broth, ranged from 9.7 to 11.8 krad. When irradiated in ground beef at 25 and −30°C, the D value of strain IP107 was 19.5 and 38.8 krad, respectively. Cells suspended in Trypticase soy broth were more sensitive to storage at −20°C than those mixed in ground beef. The percentages of inactivation and of injury (inability to form colonies in the presence of 3.0% NaCl) of cells stored in ground beef for 10 days at −20°C were 70 and 23%, respectively. Prior irradiation did not alter the cell's sensitivity to storage at −20°C, nor did storage at −20°C alter the cell's resistance to irradiation at 25°C. Added NaCl concentrations of up to 4.0% in Trypticase soy agar (TSA) (which contains 0.5% NaCl) had little effect on colony formation at 36°C of unirradiated Y. enterocolitica. With added 4.0% NaCl, 79% of the cells formed colonies at 36°C; with 5.0% NaCl added, no colonies were formed. Although 2.5% NaCl added to ground beef did not sensitize Y. enterocolitica cells to irradiation, when added to TSA it reduced the number of apparent radiation survivors. Cells uninjured by irradiation formed colonies on TSA when incubated at either 36 or 5°C. More survivors of an exposure to 60 krad were capable of recovery and forming colonies on TSA when incubated at 36°C for 1 day than at 5°C for 14 days. This difference in count was considered a manifestation of injury to certain survivors of irradiation. |
| Author | El Zawahry Y.A Rowley D.B |
| AuthorAffiliation | 1 Food Sciences Laboratory, U.S. Army Natick Research and Development Command, Natick, Massachusetts 01760 |
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| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/570017$$D View this record in MEDLINE/PubMed |
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| Notes | Q Q20 Present address: National Center for Radiation Research and Technology, Atomic Energy Establishment, Cairo, Egypt. |
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| References | 5825839 - J Appl Bacteriol. 1965 Aug;28(2):336-48 5664122 - Appl Microbiol. 1968 Jul;16(7):1061-6 1164011 - Appl Microbiol. 1975 Aug;30(2):242-50 5423281 - Can J Microbiol. 1970 Jun;16(6):465-71 13852863 - Int J Appl Radiat Isot. 1959 Oct;6:122-8 4572982 - Appl Microbiol. 1973 Apr;25(4):517-23 13697070 - Can J Microbiol. 1961 Apr;7:199-205 1237057 - Nihon Juigaku Zasshi. 1975 Feb;37(1):91-3 836022 - Appl Environ Microbiol. 1977 Jan;33(1):215-6 16349884 - Appl Microbiol. 1970 Sep;20(3):333-41 4562483 - Appl Microbiol. 1972 Sep;24(3):453-62 |
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Reddit... The D values of Yersinia enterocolitica strains IP134, IP107, and WA, irradiated at 25 degrees C in Trypticase soy broth, ranged from 9.7 to 11.8 krad. When... The D values of Yersinia enterocolitica strains IP134, IP107, and WA, irradiated at 25 C in Trypticase soy broth, ranged from 9.7 to 11.8 krad. When irradiated... The D values of Yersinia enterocolitica strains IP134, IP107, and WA, irradiated at 25°C in Trypticase soy broth, ranged from 9.7 to 11.8 krad. When irradiated... |
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| StartPage | 50 |
| SubjectTerms | Animals Cattle Cobalt Radioisotopes Food Irradiation Food Microbiology Food Microbiology and Toxicology Freezing Humans Meat Sodium Chloride - pharmacology Yersinia - radiation effects Yersinia Infections - microbiology |
| Title | Radiation resistance and injury of Yersinia enterocolitica [Food contaminants] |
| URI | http://aem.asm.org/content/37/1/50.abstract https://www.ncbi.nlm.nih.gov/pubmed/570017 https://pubmed.ncbi.nlm.nih.gov/PMC243400 |
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