时间：2017年10月26日（星期四）13:30-14:30
地点：卫津路校区第16教学楼221会议室
主讲人：韩平，奥地利维也纳大学微生物生态系博士后。2009年于国家海洋局第一海洋研究所取得硕士学位，2014年博士毕业于香港大学环境微生物学专业。博士后导师是前国际环境微生物协会主席，著名微生物生态学专家Michael Wagner教授。她目前的研究方向是：生态系统氮循环的微生物学机理研究。目前在Nature、Geomicrobiology、Applied Microbiology and Biotechnology等国际期刊上发表论文17篇（其中第一作者6篇）。
报告摘要：
Nitrification, the oxidation of ammonia (NH3) via nitrite (NO2-) to nitrate (NO3-), is a key process of the biogeochemical nitrogen cycle. For decades, ammonia and nitrite oxidation were thought to be separately catalysed by ammonia-oxidizing bacteria (AOB) and archaea (AOA), and by nitrite-oxidizing bacteria (NOB). The recent discovery of complete ammonia oxidizers (comammox) in the NOB genus Nitrospira, which alone convert ammonia to nitrate, raised questions about the ecological niches in which comammox Nitrospira successfully compete with canonical nitrifiers. Here we isolate a pure culture of a comammox bacterium, Nitrospira inopinata, and show that it is adapted to slow growth in oligotrophic and dynamic habitats on the basis of a high affinity for ammonia, low maximum rate of ammonia oxidation, high growth yield compared to canonical nitrifiers, and genomic potential for alternative metabolisms. The nitrification kinetics of four AOA from soil and hot springs were determined for comparison.
