Objective
The experimental work was made on samples of deep sea diatomaceous sediments obtained from the South Atlantic Ocean and on cultures of diatoms.
Bacteria involvement in the degradation of diatoms and diatom oozes involved both the metabolization of the organic products of lysed diatoms as well as dissolution of the mineral frustules by their exoenzymes.
The artificial fossilization of bacteria using silica (tetraethoxysilane, TEOS) provided an indication of how bacteria are silicified under different conditions. Extracelluar polymeric material (EPM) and Gram positive bacteria with a thick glycocalyx were most easily fossilized suggesting that the water content, chemical composition and consequent chemophysical behaviour of the organic matter is an important factor controlling the nucleation of minerals. Silica nucleated within days on the organic substrate as tiny nanometre sized crystals which gradually grew in size by further nucleation and coalescence to form spheres up to 50 um in diameter, and included other particles, organic as well as inorganic. They have a mammillated morphology and a relatively electron dense texture. An other type of silica deposit consists of a fine, less electron dense granular material which also included both organic and mineral particles.
An investigation was carried out into biofilm and microbial mat development on the deep sea floor and showed the almost ubiquitous presence of biofilms at sediment surfaces. The most extensive mat development was found in sediments below the sea ice, demonstrating that this is an in situ phenomenon and microbial mats are not simply the result of sediment marine snow or mucus flocs. Where extensively developed the mats undoubtedly influence biogeochemical processes and early diagenesis at the surface of sediments. A further effect of microbial mats is the stabilization of sediment surfaces and, thus, the retardation of sediment erosion.
A scanning electron microscopy (SEM) investigation of biofilm development in different types of water pipes demonstrated that smooth surfaced or fine grained material was more conducive to biofilm development and that, depending on water type, bacterially mediated precipitation of minerals within the biofilm could take place. Furthermore, bacterial erosion of the substrate (eg a steel pipe) also occurred.
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 physical sciences condensed matter physics soft matter physics
- natural sciences physical sciences optics microscopy electron microscopy
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
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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.
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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
40126 Bologna
Italy
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.