Cyanobacteria, also known as Blue–Green Algae, is a photosynthetic bacteria that can form a green carpet of
‘slimy’ algae in lakes and in ponds.
Eubacteria commonly called as Bacteria. Bacteria are prokaryotes.
Bacteria are probably the most common forms of life on earth. They are the simplest and smallest living things. Sometimes, they may exist as a chain or a group of cells. Bacteria vary in size from 0.2 to 100 microns.
Eubacteria is divided into three phyla, they are.,
- Phylum Cyanobacteria
- Phylum Spirochaete
- Phylum Proteobacteria.
Cyanobacteria (also known as blue–green algae, blue–green bacteria, and Cyanophyta) is a phylum of bacteria that obtain their energy through photosynthesis. The name “cyanobacteria” comes from the color of the bacteria – blue).
These algae have a blue color (pigment) called phycocyanin in addition to chlorophyll, making the plants appear as blue–green. They are also called cyanobacteria because of their blue– green color and the cell structure similar to bacterium. Both have a primitive cell structure, lacking membrane–bound cell organelles and a well–defined nucleus. These are single celled or multicellular algae. Some cells in multicellular forms are modified to perform a special function of nitrogen fixation. The modified cell is called the Heterocyst. A great majority of blue–green algae are fresh water algae found almost in every stagnant pool of water, wet ground and as road slime after rains.
Agrobacterium tumifaciens, a gall–forming plant pathogen that is often used in the genetic engineering
of plants, which is a member of Proteobacteria.
Spirochaete: These Eubacteria have helically coiled cells. They also have flagella that allow them to move in a twisting motion. Two well known examples of spirochetes are Treponema pallidum, the cause of syphillis, and Borrelia burgdorferi, the cause of lyme disease.
Proteobacteria: This group of Eubacteria is made up of mostly anaerobic organisms. Some are nitrogen fixating. There are species in this phylum that cause disease. Most have flagella to move around, but some can move by gliding, which means they can move by themselves.