| Summary: | 碩士 === 元智大學 === 生物科技與工程研究所 === 99 === Purple non-sulfur bacteria (PNSB) possess diverse metabolic pathway to survive in different environments, including photoautotrophic, photoheterotrophic, chemoautotrophic as well as chemoheterotrophic metabolisms. PNSB have been widely used in the fields of environmental protection, agricultural production, aquaculture and medical application, etc. The unique physiological characteristics of PNSB have also attracted the attention of researchers to investigate the possible application of these microorganisms. In this study, we have isolated and identified several strains of photosynthetic bacteria from sediments or soil from different environment in northern Taiwan, including pond water, rice field and channel. Enrichment technology was employed for isolation of PNSB with anaerobic incubation under light condition. The isolates were identified by 16S rRNA gene sequence analysis and several strains of Rhodobacter sp. were chosen for further evaluation for their applications such as production of coenzyme Q10 and bacterial pigments.
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