Anabaena
Материал из Поле цифровой дидактики
Версия от 15:20, 23 сентября 2022; Patarakin (обсуждение | вклад)
| Описание микроба | Anabaena provides a model for the study of gene differentiation in the formation of heterocysts. The recent sequencing of the genome of Anabaena sp. strain PCC 7120 is yet another step towards understanding this process. |
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| Верхний таксон | Bacteria; Cyanobacteria; Nostocales; Nostocaceae; Anabaena |
| Species - виды | Anabaena sp. PCC 7120, Anabaena flos-aque, Anabaena aequalis |
| Genome Structure= структура генома | The genome of the circular chromosome of the PCC 7120 strain of Anabaena has been sequenced. It contains 1 chromosome with 6,413,771 base pairs with 5,368 predicted protein-coding regions, and six plasmids ranging from 408,101 base pairs to 5,584 base pairs. The sequencing of the anabaena genome will aid researchers in studying the genetics and physiology of cellular differentiation, (as exhibited in the heterocycsts of Anabaena) pattern formation, and nitrogen fixation. |
| Cell Structure - клеточная структура | During times of low environmental nitrogen, about one cell out of every ten will differentiate into a heterocyst. Heterocysts then supply neighboring cells with fixed nitrogen in return for the products of photosynthesis, that they can no longer perform. This separation of functions is essential because the nitrogen fixing enzyme in heterocysts, nitrogenase, is unstable in the presence of oxygen. |
| Ecology= экология обитания | It is commonly accepted that cyanobacteria played a key role in the manufacturing of oxygen during the Precambrian period of earth's history. They perform oxygenic photosynthesis, very similar to that of eukaryotic plants and algae, by utilizing water as a reductant source, consequently producing molecular oxygen. Heterocysts, mentioned above, are terminally differentiated cells that specialize in nitrogen fixation. It is believed that the capacity for developing heterocysts first developed when the concentration of oxygen in the atmosphere (largely produced by cyanobacteria) reached levels high enough to cause the inactivation of the nitrogen-fixing enzyme nitrogenase. |
https://microbewiki.kenyon.edu/index.php/Anabaena
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