Program     PACECS: Processes and Approaches of Coastal Ecosystem Carbon Sequestration/ MEMCS: Mechanisms and Environmental Effects of Microbes on Carbon Sequestration       Poster Utilization of D-amino acids by marine Thaumarchaeota Nitrosopumilus maritimus SCM1 P-SPS2-09-S Yanran Wei* , State Key Laboratory of Marine Environmental Science, Xiamen University Wenhui Zhang, State Key Laboratory of Marine Environmental Science, Xiamen University Zilian Zhang, State Key Laboratory of Marine Environmental Science, Xiamen University Nianzhi Jiao, State Key Laboratory of Marine Environmental Science, Xiamen University Presenter Email: weiyanran1832@126.com Thaumarchaeota Nitrosopumilus maritimus SCM1 is one of the ammonia-oxidizing archaea initially isolated from a tropical marine aquarium in 2005. Most marine microbes can produced D-amino acids (D-AAs), which is the major constituent of marine DOC pool, and a potentially part of component of recalcitrant dissolved organic carbon (RDOC). The fate of D-AAs in the marine environment is unclear. It is evidence that D-AAs can be uptake by marine archaea, however whether they can be utilized by marine archaea is unknown. In this study, we performed the cultivation of the SCM1 with 19 typical D-AAs. The growth and metabolism of SCM1 were monitored by analyses of cell abundance, production of NO2-, and consumption of D-AAs and NH4+. The results indicated that some D-AAs, such as D-Met, D-Glu, and D-Val, could promote the growth of SCM1, while others, such as D-Ser, D-His, and D-Cys, could almost completely inhibit the growth, indicating that different species of D-AAs have different effects on the growth and metabolism of SCM1. The mechanism of different effects of D-AAs on the growth of SCM1 will be investigated.