Nitella


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Nitella

 

a genus of charophyte algae. There are about 100 species, 14 of which are found in the USSR. The plants reach a height of 1 m. The principal shoots and branches consist of long unicellular internodes (up to 25 cm) and multicellular nodes. The lateral shoots are forked and arranged in whorls at the nodes. Reproduction is sexual and vegetative, by fragments of the branches. The algae grow in lakes and freshened parts of the seas. Many species of Nitella are used to study intracellular processes.

References in periodicals archive ?
An SEM study of developmental variation in oospore wall ornamentation of three Nitella species (Charophyta) in Australia.
Precisiones sobre la ornamentacion de la oospora de Nitella megacarpa.
An SEM study of the oospore of some Nitella species (Chlorophyta, Charales) with descriptions of wall ornamentation and an assessment of its taxonomic importance.
Germination of Chara vulgaris and Nitella flexilis oospores: What are the relevant factors triggering germination?
The Coleochaete Connection (or Is the Connection with Nitella, or Klebsormidium, or Something Else?
Nitella, Chara) have only a zygotic type of life cycle (are only gametophytes), then consideration should be given to how this rather simple type of life cycle could have been modified into that of a land plant with a diplobiontic life cycle and sporic meiosis.
There is no supposition, or really even viable possibility, of a preexisting sporophyte in Bower's (1908, 1935) antithetic (interpolation) theory of origin of alternating generations; nor, for that matter, would such be expected based on careful scrutiny of the life cycle of Coleoehaete and other advanced charophytes (Chara, Nitella, etc.
1980) Active movement in vitro of bundle of microfilaments isolated from Nitella cell.
The characean algae, which include Chara and Nitella, are thought to be the ancestors of all higher plants (Chapman & Buchheim, 1991; Graham, 1993; Graham & Kaneko, 1991; Grambast, 1974; Groves & Bullock-Webster, 1920, 1924; Imahori, 1954; Manhart & Palmer, 1990; Pal et al.
Indeed, action potentials were observed in the isolated internodal cells of Nitella in 1898 by Georg Hormann, using extracellular electrodes, approximately 30 years before they were observed in isolated nerve cells by Adrian and Bronk (1928).
Recently the transverse alternating current impedance of Nitella has been measured during the passage of an impulse which originated several centimeters away (Cole and Curtis, 1938b).