CLASSIFICATION OF CYANOBACTERIA PDF

Cyanobacteria have played an important role in the development of the oxygenated atmosphere of our plane. Taxonomic classification is. Group: Cyanobacteria/Melainabacteria group. Phylum: Cyanobacteria . Taxonomic classification of cyanoprokaryotes (cyanobacterial. This genus is multicellular and a long cylinder. This species is classified as spirally coiled with granulated cross-walls. The picture above shows how A. platensis is part of the Bacteria domain and they Cyanobacteria phylum.


CLASSIFICATION OF CYANOBACTERIA PDF

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CLASSIFICATION OF CYANOBACTERIA PDF


Arthrospira platensis

While the goal of photosynthesis is to store energy by building carbohydrates from CO2, respiration is the reverse of this, with carbohydrates turned back into CO2 accompanying energy release. Classification of cyanobacteria appear to separate these two processes with their plasma membrane containing only components of the respiratory chain, while the thylakoid membrane hosts an interlinked respiratory and photosynthetic electron transport chain.

In contrast to green sulfur bacteria which only use one photosystem, the use of water as an electron donor classification of cyanobacteria energetically demanding, requiring two photosystems. In some cyanobacteria, the color of light influences the composition of the phycobilisomes.

Thus, the bacteria appear green in red light and red in green light. A few genera lack phycobilisomes and have chlorophyll b instead ProchloronProchlorococcusProchlorothrix.

These were originally grouped together as the prochlorophytes or chloroxybacteria, but appear to have developed in several different lines of cyanobacteria. For this reason, they are now considered as part of the cyanobacterial group. Carbon dioxide is reduced to form carbohydrates classification of cyanobacteria the Calvin cycle.

  • Cyanobacteria: Classification, Reproduction and Parasexuality
  • Cyanobacteria: Classification, Reproduction and Parasexuality

They are known to have evolved from classification of cyanobacteria through endosymbiosisi. In this case, a photosynthesizing cyanobacteria that was engulfed in classification of cyanobacteria ancient eukaryotic cell. The cyanobacterial origin of plastids is now supported by various pieces of phylogenetic[65] [57] [60] genomic[66] biochemical [67] [68] and structural evidence.

Cyanobacteria - Wikipedia

In other words, all the oxygen that classification of cyanobacteria the atmosphere breathable for aerobic organisms originally comes from cyanobacteria or their later descendants. Cyanobacteria, however, lack the organized chloroplasts of eukaryotes and have their photosynthetic apparatus distributed peripherally in the cytoplasm.

The variety of striking colors exhibited by Cyanobacteria are a result of classification of cyanobacteria major light-gathering pigments, the phycobilins, that are bound to protein granules, phycobilisomesthat classification of cyanobacteria attached to the photosynthetic membranes.

Large blooms of freshwater Cyanobacteria may produce toxins that can kill livestock. They lack a nuclear membrane and go through cell division via binary fission.

Cyanobacteria This phylum includes photoautotrophic bacteria that utilize photosynthesis but lack chloroplasts.

These cells have no flagella. The frequency of classification of cyanobacteria is very low about 1 in cells and cells conjugate by means of a conjungation tube.

The knowledge of transduction in these microorganisms at present is restricted to some preliminary reports.

Blue-green Algae - Cyanobacteria - Classifications - Encyclopedia of Life

However, the occurrence of different cyanophages, e. As stated earlier, the cyanobacteria are the only organisms able to perform oxygenic photosynthesis that can also fix classification of cyanobacteria many, but not all, are vigorous nitrogen fixers. The coexistence of the processes of oxygenic photosynthesis and intrinsically anaerobic nitrogen fixation process in a single organism presents an obvious paradox because nitrogenase, the key enzymes, is rapidly and irreversibly inactivated by an exposure even to low partial pressure of oxygen.

However, the nitrogen fixing cyanobacteria produce a specialized type of cell, the heterocyst, within which nitrogen is fixed. Filamentous forms of cyanobacteria such as Anabaena form large distinctive cyst-like cells, the heterocysts, at classification of cyanobacteria along the trichome filamentFig.

Cyanobacteria

The conversion of atmospheric nitrogen to ammonia takes place under highly anaerobic conditions, that only the heterocysts are able classification of cyanobacteria provide. Economic Importance of Cyanobacteria: Cyanobacteria are one of the early colonizers of bare and barren areas and generate such conditions that favour the growth of other organisms even in the most hostile environment.

They are good food source for several aquatic animals.

CLASSIFICATION OF CYANOBACTERIA PDF