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metal prints nature metal prints azolla metal prints anabaena metal prints water fern metal prints plant metal prints cyanobacterium metal prints surface metal prints leaf metal prints biology metal prints botany metal prints microbiology metal prints sem metal prints coloured metal prints scanning electron microscope metal prints adaptation metal prints

photographs nature photos azolla photos anabaena photos water fern photos plant photos cyanobacterium photos surface photos leaf photos biology photos botany photos microbiology photos sem photos coloured photos scanning electron microscope photos adaptation photos

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Azolla plant surface. Coloured scanning electron micrograph (SEM) of the surface of an Azolla (water fern) plant. This plant has a symbiotic relationship with Anabaena cyanobacteria, where the cyanobacteria doubles the rate of photosynthesis and fulfils the nitrogen requirements of the plant. Both these factors give the water fern a competitive advantage over other water plants, a factor spotted by the Chinese 2000 years ago. The Anabaena-Azolla association is used as a green manure for rice crops. Anabaena is a filamentous organism, which, apart from vegetative cells, forms heterocysts and akinetes.

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