2018/03/20 [演講] 3/23【跨領域環境議題座談】- 江殷儒博士

Exploring microbial diversity involved in biodegradation: steroid degradation as an example


Time: 3/23 (Friday) 12:20-14:00pm
Place: Global Change Research Centre 2F room G202
Speaker: Yin-Ru Chiang- Associate Research Fellow, Research Center for Biodiversity, Academia Sinica
副研究員 中央研究院生物多樣性中心


►Abstract
Steroids are ubiquitous in natural environments and are a significant growth substrate for microorganisms. Steroid degradation is therefore relevant to global biogeochemistry. Microbial steroid metabolism is also important for some pathogens and for biotechnical applications. Moreover, the presence of steroid hormones in the environment has become a major issue in environmental science and policy because these compounds (e.g. estrogens at sub-ng/L concentrations) interfere with the endocrine system and alter diverse physiological functions including reproduction and development in animals, especially aquatic species. Biodegradation has been considered a crucial process for removing steroid hormones from the contaminated ecosystems. Thus far, numerous steroid degraders have been isolated and characterized. However, biochemical mechanisms underlying microbial steroid metabolism are largely unknown. Furthermore, literature on the ecophysiological relevance of steroid-degrading organisms in the environment is extremely limited. In the past decade, we have proposed several aerobic and anaerobic steroid degradation pathways in model organisms. We also studied the distribution of these degradation pathways in diverse environments. The current results show that steroid-degrading bacteria are globally distributed and prevalent in particular environments, such as wastewater treatment plants, soil, plant rhizospheres, and the marine environment, including marine sponges.


►Lunch will be provided.

►報名網址如下 (please register below):
Environmental Cross-disciplinary Seminar 2018 Mar-May


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