GreenWater Laboratories - Algal Toxin Analysis, Algal identification, Research
DNA evidence suggests that the first eukaryotes (green plants) evolved from Among algae, blue green algae or cyanobacteria represent an ancient group of Their biological significance, especially as the prokaryotic interface between the. The term algae is used to describe a diverse collection of aquatic organisms that, and in symbiotic relationships with other organisms such as fungi (lichens). bacteria (prokaryotic), where the term "algae" is now reserved for eukaryotic organisms. Many of the bloom-forming algae are cyanobacteria (blue-green algae). Cyanobacteria resemble the eukaryotic algae in many ways, including Blue- green algae, also called cyanobacteria, any of a large, heterogeneous group of Algae have since been reclassified as protists, and the prokaryotic nature of the Certain species, for example, grow in a mutualistic relationship with fungi.
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They have the distinction of being the oldest known fossils, more than 3. It may surprise you then to know that the cyanobacteria are still around; they are one of the largest and most important groups of bacteria on earth. Many Proterozoic oil deposits are attributed to the activity of cyanobacteria. They are also important providers of nitrogen fertilizer in the cultivation of rice and beans.
The cyanobacteria have also been tremendously important in shaping the course of evolution and ecological change throughout earth's history.Cyanobacteria in Hindi
The oxygen atmosphere that we depend on was generated by numerous cyanobacteria during the Archaean and Proterozoic Eras. Before that time, the atmosphere had a very different chemistry, unsuitable for life as we know it today. The other great contribution of the cyanobacteria is the origin of plants. The chloroplast with which plants make food for themselves is actually a cyanobacterium living within the plant's cells.
Sometime in the late Proterozoic, or in the early Cambrian, cyanobacteria began to take up residence within certain eukaryote cells, making food for the eukaryote host in return for a home. Chemical, genetic, and physiological characteristics are used to further classify the group within the kingdom.
Introduction to the Cyanobacteria
Cyanobacteria may be unicellular or filamentous. Many have sheaths to bind other cells or filaments into colonies. Cyanobacteria contain only one form of chlorophyllchlorophyll a, a green pigment. In addition, they contain various yellowish carotenoids, the blue pigment phycobilin, and, in some species, the red pigment phycoerythrin.
The combination of phycobilin and chlorophyll produces the characteristic blue-green colour from which these organisms derive their popular name. Because of the other pigments, however, many species are actually green, brown, yellow, black, or red. Most cyanobacteria do not grow in the absence of light i. Particularly efficient nitrogen fixers are found among the filamentous species that have specialized cells called heterocysts. The heterocysts are thick-walled cell inclusions that are impermeable to oxygen; they provide the anaerobic oxygen-free environment necessary for the operation of the nitrogen-fixing enzymes.
In Southeast Asianitrogen-fixing cyanobacteria often are grown in rice paddiesthereby eliminating the need to apply nitrogen fertilizers. Cyanobacteria range in size from 0. They are widely distributed and are extremely common in fresh waterwhere they occur as members of both the plankton and the benthos. They are also abundantly represented in such habitats as tide pools, coral reefs, and tidal spray zones; a few species also occur in the ocean plankton.
- Algae & Cyanobacteria
- Difference between cyanobacteria and green algae
- Introduction to the Cyanobacteria
On land, cyanobacteria are common in soil down to a depth of 1 m 39 inches or more; they also grow on moist surfaces of rocks and trees, where they appear in the form of cushions or layers. Cyanobacteria flourish in some of the most inhospitable environments known.