Carbon Fixation and Nitrate Respiration in the Hydrothermal Vent Tubeworm Riftia Pachyptila

费尔贝克9314525 深海热液喷口的自由共生细菌利用地热过程形成的硫化物作为化能自养过程的能源。 为了描述 的 碳的流动 通气 在社区中，需要关于无机碳（CO2）最初如何被纳入有机化合物以及能源来源的信息。 同样重要的是要了解这种碳最终从喷口细菌转移到群落其他部分的机制，特别是 热液喷口 管虫 Riftia 厚皮虫 因此，本项目将重点关注 三个研究目标： (1)将CO2作为有机分子在血液R中的运输进行量化。厚毛;（2）追踪琥珀酸的命运，琥珀酸是从细菌转移到其宿主的分子，也是血液中携带最大比例的外部CO2的有机酸;以及（3）确定 相对 两种选择重要性 用于硫化物氧化的电子受体，例如，氧和硝酸盐呼吸。厚皮虫 这项研究的结果将描绘重要的生化途径 喷口合成有机物的机制 社区，这是中心 到 了解深海热液喷口的化能自养过程。 ***

Felbeck 9314525 Free-living and symbiotic bacteria at deep-sea hydrothermal vents use the sulfide formed by geothermal processes as an energy source for chemoautotrophic processes. In order to describe the flow of carbon in a vent community, information is required on how inorganic carbon (CO2) is originally incorporated into organic compounds, and with which energy sources. It's also important to understand the mechanism by which this carbon is eventually transferred from vent bacteria to rest of the community, in particular the hydrothermal-vent tubeworm Riftia pachyptila. Therefore, this project will focus on three research objectives: (1) quantify the transport of CO2 as organic molecules in the blood R. pachyptila; (2) trace the fate of succinate, the molecule transferred from bacteria to their hosts as well as the organic acid carrying the largest proportion of external CO2 in the blood; and (3) determine the relative importance of two alternative electron acceptors for sulfide oxidation, e.g., oxygen and nitrate respiration in R. pachyptila. The results of this research will delineate the important biochemical pathways and mechanisms involved in the synthesis of organic matter by vent communities, which is central to understanding chemoautotrophic processes at deep-sea hydrothermal vents. ***