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Microbiol. Rev., Dec 1996, 641-696, Vol 60, No. 4
HM Davey and DB Kell
The most fundamental questions such as whether a cell is alive, in the
sense of being able to divide or to form a colony, may sometimes be very
hard to answer, since even axenic microbial cultures are extremely
heterogeneous. Analyses that seek to correlate such things as viability,
which is a property of an individual cell, with macroscopic measurements of
culture variables such as ATP content, respiratory activity, and so on,
must inevitably fail. It is therefore necessary to make physiological
measurements on individual cells. Flow cytometry is such a technique, which
allows one to analyze cells rapidly and individually and permits the
quantitative analysis of microbial heterogeneity. It therefore offers many
advantages over conventional measurements for both routine and more
exploratory analyses of microbial properties. While the technique has been
widely applied to the study of mammalian cells, is use in microbiology has
until recently been much more limited, largely because of the smaller size
of microbes and the consequently smaller optical signals obtainable from
them. Since these technical barriers no longer hold, flow cytometry with
appropriate stains has been used for the rapid discrimination and
identification of microbial cells, for the rapid assessment of viability
and of the heterogeneous distributions of a wealth of other more detailed
physiological properties, for the analysis of antimicrobial drug-cell
interactions, and for the isolation of high- yielding strains of
biotechnological interest. Flow cytometric analyses provide an abundance of
multivariate data, and special methods have been devised to exploit these.
Ongoing advances mean that modern flow cytometers may now be used by
nonspecialists to effect a renaissance in our understanding of microbial
heterogeneity.
Copyright © 1996, American Society for Microbiology
Flow cytometry and cell sorting of heterogeneous microbial populations: the importance of single-cell analyses
Institute of Biological Sciences, University of Wales, Aberystwyth, Dyfed, United Kingdom.
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