Linked Life Data

11169051

Source:http://linkedlifedata.com/resource/pubmed/id/11169051

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2001-2-22
pubmed:abstractText
The influence of a second lethal stress (SLS) was investigated when populations of Escherichia coli M23 OR.H- were exposed to either a low water activity (aw) of 0.90 or a pH of 3.50 after 24 h at 25 degrees C. Regardless of the initial stress, E. coli M23 OR.H- populations initially demonstrated biphasic inactivation kinetics consisting of a rapid first phase of death followed by a slower second phase. When cultures initially exposed to aw 0.90 experienced an SLS of pH 3.50, a second rapid inactivation period was observed before a subpopulation of more resistant cells emerged. This subpopulation was able to persist for approximately 50 h after imposition of the SLS. In contrast, E. coli M23 OR.H- cells first exposed to a pH of 3.50 were inactivated rapidly to levels below the limits of detection upon imposition of an SLS of aw 0.90. It is hypothesized that pH stress constitutes a large energy drain on the cell and subsequently sensitizes it to other environmental constraints requiring expenditure of metabolic energy.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0266-8254
pubmed:author
pubmed:issnType
Print
pubmed:volume
32
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
99-102
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2001
pubmed:articleTitle
Differentiation of the effects of lethal pH and water activity: food safety implications.
pubmed:affiliation
School of Agricultural Science and Tasmanian Institute of Agricultural Research, University of Tasmania, Hobart, Tasmania, Australia. craig_ts@utas.edu.au
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't