Volvox


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Volvox

 

a genus of mobile colonial Chlorophyta (green algae) living in stagnant fresh waters. In the USSR there are four species. Volvox has the shape of a sphere measuring up to 3 mm in diameter; on the periphery of the sphere there is a single layer of from 200 to 50,000 cells, which are connected by protoplasmic threads: the cavity is filled with a liquid mucus. Two flagella extend outward from each cell; their movement propels the organism. A few larger cells serve for asexual and sexual reproduction; the sexual process is oogamy.

References in periodicals archive ?
At present, the Volvox Terranova's 40-man crew is working eight hours a day for six-week stretches on the construction of the Palm Deira Island.
Left: A Volvox colony generates whirlpools of fluid motion, visualized by a dye and seen from the side (top image) and from above (bottom).
Moreover, the flagella of Volvox are nearly identical to the cilia in the human body, whose coordinated action is central to many processes in embryonic development, reproduction, and the respiratory system.
A novel extensin that may organize extracellular matrix biogenesis in Volvox carteri.
The species used and their accession numbers are as follows: Paramecium tetraurelia (Ciliophora), X03772; Oxytricha nova (Ciliophora), X03948; Crypthecodinium cohnii (Dinozoa), M64245; Theileria annulata (Apicomplexa), M64243; Sarcocystis muris (Apicomplexa), M64244; Hartmanella vermiformis (Rhizopoda), M95168; Saccharomyces cerevisiae (Fungi), J01353; Filobasidiella neoformans (Fungi), X60183; Arabidopsis thaliana (Plantae), X16077; Volvox carteri (Plantae), X53904; Beroe cucumis (Ctenophora), D15068; Trichoplax adhaerens (Placozoa), L10828; Anemonia sulcata (Cnidaria), X53498; Scypha ciliata (Porifera), L10827; Henneguya sp.
The cash was raised with a national charity quiz run by financial business Lloyds TSB Development Capital and backed by car parts supplier Volvox, part of Leeds-based Ring Automotive.