Euglena


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Euglena

[yü′glē·nə]
(biology)
A genus of organisms with one or two flagella, chromatophores in most species, and a generally elongate, spindle-shaped body; classified as algae by botanists (Euglenophyta) and as protozoans by zoologists (Euglenida).

Euglena

 

a genus of microscopic motile single-celled organisms of the division Euglenophyta. The cell is spindle- or ribbon-shaped, with a pellicle in front, a single external flagellum, and a stigma next to the gullet. The ocellus is red. The chloroplasts are green and frequently complex in structure.

About 60 species of euglenas are known. They mainly inhabit shallow bodies of water, where they swim at any depth. Some species, such as Euglena viridis, can discard the flagellum and creep or, after taking on a spherical form, live immobile on the surface of the water, silt, or soil. Under unfavorable conditions they become transformed into spores. Nutrition is usually myxotrophic, or if there is a loss of chlorophyll, saprophytic. The organisms are distributed widely and sometimes cause the coloration of waters. Euglena sanguinea, which is rich in carotene, makes water red. Euglenas are used in laboratory experiments.

References in periodicals archive ?
Brian was the only participant who had integrated many of the argumentation activities into his teaching, stating that he had instructed the students on the process of argumentation, and used a number of activities including the euglena activity, the snowman activity, the candle activity, and the pulse rate activity.
The scientists decided to use Euglena as a natural cargo carrier.
A great deal of research has been done on Euglena and other unicellular photosynthetic organisms, so most students can find ample material using standard scientific databases available to most university libraries.
The cake was jointly developed by Euglena Co., a venture firm specializing in the study of the organism with a single flagellum at the University of Tokyo, and Soke Kutsuwado, a confectioner based in Takamatsu, Kagawa Prefecture.
Similarly, for a euglena there must be a flow of information between eyespot and flagellum in food acquisition, just as there must be a flow of information between chloroplasts and plastids in food storage.
Especially well-succeeded colonizers belong to Euglenophyta and Chlorophyta (Euglena mutabilis and Kleb sormidium sp., respectively) are the most abundant and persistent ones.
Keywords: Cynarasaponins; Euglena gracilis; Ofloxacin; Acridine orange; Antimutagenicity
She left Berkeley in 1963, with the research and writing of her dissertation almost completed, obtaining her degree in 1965, after she had published her thesis, "Unusual Pattern of Thymidine Incorporation in Euglena," in a peer-reviewed journal.
The purpose of this research was to determine the effect of concentrations of ibuprofen and aspirin on the reproduction rate if Euglena hemichromata, a "starter" in the food chain.
They controlled the prey supply by adding either Euglena (a motile single-celled organism) atone or Euglena plus tiny invertebrate animals (copepods, nematode worms and the like), known collectively as meiofauna.
b, c a Euglena a a Netrium a a (Phacus) a (Peridinium) a Scenedesmus d a, c a a a Staurastrum a a Herbivores Brachionus c a a Frontonia d a Hypostome sp.
of Southern Mississippi, Hattiesburg, has used an ESEM to more clearly define intra-cellular structures within Euglena gracilis.