Active biomass in the marine subsurface tracked by intact polar membrane lipids

通过完整的极性膜脂质追踪海洋地下的活性生物量

• 批准号: 5435084
• 负责人: Professor Dr. Kai-Uwe Hinrichs
• 金额: --
• 依托单位: Zentrum für Marine Umweltwissenschaften (MARUM)
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2004
• 资助国家: 德国
• 起止时间: 2003-12-31 至 2006-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5435084?language=en
• 关键词: Active; biomass; marine; subsurface; tracked

One primary goal of ODP/IODP is to obtain a detailed understanding of the nature of and the factors that control prokaryotic life in deeply buried sediments. We propose to extract information on the microbial ecology and the metabolism of prokaryotes from the structural and isotopic information encoded in intact polar lipids in deeply buried sediments. Intact polar lipids (IPLs) are ubiquitous membrane compounds that rapidly decay after death and thus select against fossil lipid signals that originated from an earlier point in the sediment's history. Studying sediments from ODP Legs 201, 204, and 207, we will address the two overarching research questions: (1) What ist the relationship between the sediments' geochemical regime and the structural diversity and abundance of IPLs? (2) What information regarding the metabolic pathways utilized by deeply buried prokaryotes in-situ can be inferred from down-core profiles of the carbon-isotopic compositions of bulk IPL fraction? The molecular-isotopic data will be integrated with complementary molecular-genetic data from national and international collaborators. The project seeks to support a PhD student... who will be integrated an international team of collaborators in Germany and the U.S.

ODP/IODP的一个主要目标是详细了解深埋沉积物中原核生物的性质和控制原核生物的因素。我们建议从深埋沉积物中完整极性脂质编码的结构和同位素信息中提取原核生物的微生物生态和代谢信息。完整的极性脂质（IPL）是普遍存在的膜化合物，在死亡后迅速衰变，从而选择对化石脂质信号，起源于沉积物的历史中的早期点。通过对ODP第201、204和207航次沉积物的研究，我们将解决两个首要的研究问题：（1）沉积物的地球化学状态与IPL的结构多样性和丰度之间的关系是什么？(2)从大量IPL组分的碳同位素组成的岩芯剖面中可以推断出深埋原核生物原位利用的代谢途径的哪些信息？分子同位素数据将与国家和国际合作者提供的互补分子遗传数据相结合。该项目旨在支持一名博士生...他将成为一个由德国和美国的合作者组成的国际团队。