Objective
Iron is an essential element in many key biochemical processes, including respiration, nitrogen fixation, nitrate reduction, and chlorophyll biosynthesis. Iron limits phytoplankton production and regulates plankton community structure over large areas of the ocean, and for some marine bacteria, iron stress stimulates expression of high affinity iron acquisition systems, including extracellular iron specific chelators, or siderophores. Iron speciation measurements show that >99% of dissolved iron is complexed by organic ligands of unknown composition, and that these complexes have conditional stability constants characteristic of siderophores, low molecular mass molecules that have a high specificity for chelating or binding iron. Siderophores in marine heterotrophic bacteria have been identified, and siderophore-like compounds have been detected in exudates of marine phytoplankton. It has been postulated that siderophores or their breakdown products make up a large fraction of the strong iron-binding ligands in surface seawater, and that they play an important role in microbial iron uptake. Nevertheless, only one marine cyanobacterium siderophore has been definitively characterized, and no siderophores from any photoautotrophs have ever been isolated from seawater. Are siderophores present in the mixture of iron binding ligands in seawater, and do marine photoautotrophs use siderophores to acquire iron? Or are natural iron binding ligands a by-product of generic organic matter cycling with little affect on iron uptake? The evidence that a large fraction of dissolved iron is complexed by organic ligands is compelling. However, we do not yet know the nature of the ligands, or if indeed (as many have suggested), they mediate iron acquisition by marine microbes. Here I propose to collect iron-binding ligands from very large volume surface seawater samples for detailed spectroscopic characterization (mass spectrometry and nuclear magnetic resonance spectroscopy).
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences biological sciences microbiology bacteriology
- natural sciences chemical sciences analytical chemistry mass spectrometry
- natural sciences physical sciences optics spectroscopy
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Keywords
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Call for proposal
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
FP7-PEOPLE-2007-4-1-IOF
See other projects for this call
Funding Scheme
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
28006 MADRID
Spain
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.