Euglena
Euglena is a commun run of Protiste S Flagellé S, typical of the Euglénophytes, and often present in water (generally of fresh water, but there exist rare marine species) rich in nutrients.
The length of the cells varies from 20 to 300 µm; they are typically cylindrical, or ovales. There is in general many Chloroplaste S of color green-clearly, although unquestionable S are colorless. Greek words have and glêne , but good eyeball , referring to the light-sensitive eyespot. -->
The euglenes divide by longitudinal division of the cell. There is no sexuée reproduction.
It was described more than 100 S of Euglena . Sailor and Al (2003) reviewed the kind in order to make a group Monophylétique of it, by displacement of various species to rigid films towards the kind Lepocinclis and by the incorporation of various species without chloroplast, previously classified as a Astasia and Khawkinea .
The euglenes have Chloroplaste S allowing the Photosynthèse. An experiment shows that the euglenes can lose these chloroplasts under certain conditions. If one adds a Antibiotique like the Streptomycine in the middle of culture of euglenes, the division of the chloroplasts is inhibited but whereas the cellular division is not to affect. During successive divisions of euglenes, the chlorplastes are distributed in the cells girls, but with the wire of the generation, there is less and less, those not being able more to divide. At the end of a certain number of cellular divisions, the cells girls do not have any more chloroplasts. They thus become Hétérotrophe S and behave like animal cells. This experiment, coupled with the fact that the euglenes move thanks to whip, watch the brittleness of the border between the animal definitions of and vegetable.
References
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