Search results for "Nanochlorum eucaryotum"

Nanochlorum eucaryotum — a green enigmatic alga: morphology, biochemistry and molecular biology

1994

In search of a natural systematic locality for algae — and also for other organisms — quite regularly the central question of evolution comes up. This proves as especially pertinent, when the taxonomic position of the most original phytoflagellates has to be considered. In the classical view of the direct filiation theory the ancestral phytoflagellata is positioned at the verge of the prokaryotic to the eukaryotic stage.

Growth and Photosynthesis of Nanochlorum eucaryotum, a New and Extremely Small Eucaryotic Green Alga

1982

Nanochlorum eucaryotum is a very small species of unicellular coccoid green algae (1.5 pm). The growth of Nanochlorum under different conditions of salinity, pH and light intensities was studied. Optimal growth rates were observed with normal sea water salinity and low light conditions at pH 7.0. The contents of chlorophylls, carotinoids, soluble proteins and the chlorophyll a to chlorophyll b ratio were measured. The light saturating curves of Nanochlorum cells grown under light intensities of 100 lx, 2000 lx and 10000 lx reveal a very narrow capacity of light adaptation. When cultured under higher light intensities, Nanochlorum was not able to reach high photosynthetic activities but unde…

Nanochlorum eucaryotum: a Very Reduced Coccoid Species of Marine Chlorophyceae

1982

Nanochlorum eucaryotum was isolated from a sea water aquarium housing different sponge species, cucumarias, small crustaceans and annelids. This bright green marine alga differs from all other known coccoid species. Its most prominent features are its very small cell size (1.5 pm) and its reduced cellular organization. Its cell contains one nucleus, one chloroplast, one mitochondrium and small vacuoles. Sometimes a Golgi apparatus can be seen. No other subcellular features have been observed. The cell wall is thin and smooth and does not contain any material of high electron density; only dividing cells show a rougher surface. The cells split into two daughter cells. No sexual reproduction …

Nucleotide sequence of the 18S rDNA from the microalgaNanochlorum eucaryotum

1988

A Comparative Ultrastructural Investigation of Some Nannochloris Species (Chlorococcales) with Particular Reference to the Systematic Position of Nan…

1989

Nanochlorum eucaryotum was described by Wilhelm et al. (1982) as a new algal species with an uncertain taxonomic position. Whereas some features were chlorococcacean, others suggested an isolated position in the sense of a “pre-eucaryote” (Wilhelm, 1983; Zahn, 1984; Geisert et al., 1987). Our comparative ultrastructural, physiological and biochemical examinations of coccoid microalgae (Menzel, 1988) gave no arguments for the separation of Nanochlorum eucaryotum from the genus Nannochloris. This paper is concerned with the ultrastructural composition of the cell wall and mode of reproduction in Nanochlorum eucaryotum as well as in three Nannochloris species. The systematic position of Nanoch…

Identification and characterization of DNA sequences with ars-activity from the small eukaryote Nanochlorum eucaryotum

1988