Metabolism of cyanobacteria (gaseous exchanges )
Streptococcus thermophilus observed by oil immersive microscope (X1000)
Gram staining
Composition of bacterial cell wall (Gram + and Gram -)
Lactobacillus sp. observed by oil immersive microscope (X1000)
Cyanobacteria (filamentous form)
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Trichodesmium sp. (microphotographie)
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Nitrogen and carbon fixation by Trichodesmium
Trichodesmium sp. (cyanobacterium)
Phytoplankton in Pacific Océan
Abundance of phytoplankton in Atlantic ocean and Mediterranean sea
Elsa Marin
Yi Zhou
Guillaume Taglang
International School PACA
International School PACA ITER
New nanoplanctonic cyanobacteria that can fix nitrogen
New nanoplanctonic cyanobacteria modify the knowledge about nitrogen and carbon fixation.
Scientists have discovered a new group of nanoplanctonic cyanobacteria bacteria, that can absorb also the atmosphjeric N2. With Trichodesmium, they represent two big families of Nitrogen fixing cyanobacteria.
These bacteria could modify the oceanic food chain. During the canicular period in the summer of 2006 in Marseilles, a strong proliferation of these cyanobacteria could be observed. Then, the scientists noticed that they were very reactive to the climate and the pollution. But these bacteria wouldn't be able to absorb the CO2 they would need. They do not have the rubisco enzyme fundamental for the fixation of carbon dioxide.
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