Chiang Mai Journal of Science

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Among photosynthetic prokaryotes, the cyanobacteria represent by far the largest and most diverse group. Mastigocladus is one of the thermophilic species found in hot springs throughout the world including Thailand. Mastigocladus mats occur dominant in Ranong Hot Spring, Ranong Province, Southern Thailand. Cyanobacterial mats have been studied in 40-60 ºC of temperature intervals. They were observed by using microscopy and molecular technique analysis. In this study, the denaturing gradient gel electrophoresis (DGGE) analysis of PCRamplified 16S rDNA gene segments was used to profile cyanobacterial populations inhabiting different temperature regions in the mat community. From this technique, Mastigocladus - like cyanobacteria were found in every temperature range and every season, however there was no significant difference between cyanobacterial populations in the Ranong Hot Spring.

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