Journal
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
Volume 71, Issue 10, Pages 6453-6457Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/AEM.71.10.6453-6457.2005
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The effects of temperature, salt concentration, and formamide concentration on the emission characteristics of commonly used fluorescent labels were evaluated on DNA microchips. The emission intensities of different fluorophores without hybridization were observed to vary, each to a different extent, to mainly temperature changes. Rhodamine red, TAMRA (tetramethylrhodamine), and dyes from the carbocyanide group exhibited the largest variations, and Texas Red and Oregon Green exhibited the smallest variations. This temperature dependency was shown to affect results obtained during melting curve analysis in DNA microarray studies. To minimize the bias associated with the temperature-dependent emission of different fluorescent labels, a normalization step was proposed.
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