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Application of replica plating and computer analysis for rapid identification of bacteria in some foods. II. Analysis of microbial flora in irradiated Dover sole (Microstomus pacificus).

Authors
  • Corlett, D A Jr
  • Lee, J S
  • Sinnhuber, R O
Type
Published Article
Journal
Applied microbiology
Publication Date
Sep 01, 1965
Volume
13
Issue
5
Pages
818–822
Identifiers
PMID: 5325943
Source
Medline
License
Unknown

Abstract

This investigation was carried out to determine the nature of the microbial flora shifts in dover sole as a result of irradiation and storage at 6 C. The relationship was determined between the microorganisms which initially survive irradiation and those making up the final spoilage flora. A total of 2,723 isolates were examined by use of the replica-plating and computer analysis method. The spoilage of the unirradiated control samples during storage at 6 C was almost entirely due to the growth of Pseudomonas. This group, which occupied 25% of the fresh flora, grew to nearly 100% in 2 days of storage. In contrast, irradiation doses of 0.1, 0.2, 0.3, and 0.4 Mrad favored the growth of Achromobacter and yeasts. The Micrococcus, which survived radiation, did not grow at 6 C. At 0.5 Mrad, spoilage of fish samples was due entirely to the growth of yeasts.

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