Scientists have found a cyanobacterium, inside which there are calcareous granules. Most likely, these granules are playing the role of a ballast hold cyanobacteria on the surface of the water bottom or stramatolita.
Geobiology found inside of a blue-green algae structure, strongly resembling bone. If further studies support function of the structures found confirmed, the cyanobacteria are found to be the first owners of the internal skeleton, like the skeleton of vertebrates.
Researchers from academic centers in the UK, France and USA have studied previously unknown blue-green algae in the lake stromatolites. Alchichika in Mexico. They moved some of the cyanobacteria in the aquarium and watched them grow. In this study, researchers found white particles intracellularly. Outwardly, they are very similar to tiny pearls. In their analysis the researchers found that the pellets are an unusual mixture of calcium carbonate, barium, magnesium and strontium. Wherein the ratio of the elements in the granules was not such as bacteria in the environment. This means that these cyanobacteria formed particles themselves, selecting for their specific salt. Despite the fact that the beads held only 6% of the cells, they had a significant impact on the overall density of the cyanobacteria, increasing it by 12%.
Many modern cyanobacterial cell surface formed shell consisting of compounds which are by-products of photosynthesis. Such armor appeared in the blue-green algae more than 1.15 billion years ago. Scientists believe they have found bacteria with carbonate granules are transitional between the views of quite ancient cyanobacteria and those in the process of evolution acquired external shell. It turns out that blue-green algae began with the internal skeleton, later opting for the outside.
Original: Physorg com