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• W2152567033 abstract "Microbial exopolymer may hinder the diffusion of nutrients, antibiotics, and other materials to the cell surface. Studies of diffusion in biofilms have been limited to indirect measurements. This study demonstrated the use of fluorescein and size-fractionated fluor-conjugated dextrans in conjunction with scanning confocal laser microscopy to directly monitor and determine diffusion coefficients within biofilms. The monitoring approaches were simple and, when combined with computerized image collection, allowed assembly of a data set suitable for calculation of one-dimensional diffusion coefficients for biofilm regions. With these techniques, it was shown that regional variability in the mobility of the dextrans occurred within mixed-species biofilms. Some regions exhibited rapid diffusion of all test molecules, while adjacent regions were only penetrated by the lower-molecular-weight compounds. The effective diffusion coefficients ( D e ) determined in a mixed-species biofilm were a function of the molecular radius of the probe (i.e., fluorescein, D e = 7.7 × 10 -8 cm 2 s -1 ; 4,000 molecular weight, D e = 3.1 × 10 -8 cm 2 s -1 ; and 2,000,000 molecular weight, D e = 0.7 × 10 -8 cm 2 s -1 ). These results demonstrated that diffusion in the biofilm was hindered relative to diffusion in the bulk solution. The study indicated that in situ monitoring by scanning laser microscopy is a useful approach for determining the mobility of fluorescently labeled molecules in biofilms, allowing image acquisition, appropriate scales of study, both xy and xz monitoring, and calculation of D e values." @default.
• W2152567033 created "2016-06-24" @default.
• W2152567033 creator A5034216639 @default.
• W2152567033 creator A5051076665 @default.
• W2152567033 creator A5074408546 @default.
• W2152567033 date "1994-04-01" @default.
• W2152567033 modified "2023-10-11" @default.
• W2152567033 title "Determination of Diffusion Coefficients in Biofilms by Confocal Laser Microscopy" @default.
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• W2152567033 doi "https://doi.org/10.1128/aem.60.4.1166-1173.1994" @default.
• W2152567033 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/201454" @default.
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