Fluorescence and fluorescence-lifetime imaging microscopy (FLIM) to characterize yeast strains by autofluorescence

H. Bhatta*, E. M. Goldys, J. Ma

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

Abstract

We characterised populations of wild type baking and brewing yeast cells using intrinsic fluorescence and fluorescence lifetime microscopy, in order to obtain quantitative identifiers of different strains. The cell autofluorescence was excited at 405 nm and observed within 440-540 nm range where strong cell to cell variability was observed. The images were analyzed using customised public domain software, which provided information on cell size, intensity and texture-related features. In light of significant diversity of the data, statistical methods were utilized to assess the validity of the proposed quantitative identifiers for strain differentiation. The Kolmogorov-Smirnov test was applied to confirm that empirical distribution functions for size, intensity and entropy for different strains were statistically different. These characteristics were followed with culture age of 24, 48 and 72 h, (the latter corresponding to a stationary growth phase) and size, and to some extent entropy, were found to be independent of age. The fluorescence intensity presented a distinctive evolution with age, different for each of the examined strains. The lifetime analysis revealed a short decay time component of 1.4 ns and a second, longer one with the average value of 3.5 ns and a broad distribution. High variability of lifetime values within cells was observed however a lifetime texture feature in the studied strains was statistically different.

Original languageEnglish
Title of host publicationImaging, Manipulation, and Analysis of Biomolecules, Cells, and Tissues IV
EditorsDaniel L. Farkas, Dan V. Nicolau, Robert C. Leif
Place of PublicationBellingham, WA
PublisherSPIE
Pages608801-1-608801-11
Number of pages11
ISBN (Print)081946130X, 9780819461308
DOIs
Publication statusPublished - 2006
EventImaging, Manipulation, and Analysis of Biomolecules, Cells, and Tissues IV - San Jose, CA, United States
Duration: 23 Jan 200625 Jan 2006

Publication series

NameProceedings of SPIE
PublisherSPIE
Volume6088
ISSN (Print)1605-7422

Other

OtherImaging, Manipulation, and Analysis of Biomolecules, Cells, and Tissues IV
CountryUnited States
CitySan Jose, CA
Period23/01/0625/01/06

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