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.
In order to maximize productivity, Van Oord's engineers have made several improvements to the Volvox Terranova dredger, including the installation of a new clutch design for the main dredge pump.
For the Volvox Terranova, Van Oord specified new multiplate clutches for the dredge pump drive from Wichita Clutch, an Altra Industrial Motion company.
Left: A Volvox colony generates whirlpools of fluid motion, visualized by a dye and seen from the side (top image) and from above (bottom).
* Watch videos of Volvox algae dancing at www.youtube.com/Goldsteinlab
Modified Volvox channelrhodopsin-1 (mVChR1), which was invented by Professor Hiroshi Tomita, currently on the Faculty of Engineering in Iwate University, and his colleagues, is an engineered photoreceptive ion channel with the ability to respond to broad wavelengths of lights, created by modifying channelrhodopsins3) found in green algae.
However, there was a lower incidence of colonial and filamentous cyanobacteria and an increase of Clorophyceae, especially Volvox aureus.
An increase in phytoplankton community diversity occurs during the SHIP, where the elevated biomass of potentially toxic cyanobacteria (MBFG III) is replaced by non-toxic species, represented primarily by Volvox aureus (MBFG V), Aulacoseira granulata (MBFG VI) and Coelosphaerium Kuetzingianum (MBFG VII).
He said it looks as if Volvox had translocated these genes into its MT area, and over time they have gained new functions related to sex.
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.
Looking on are (left to right) Catherine Longley (Hollybank), Keith Pacey (Volvox), Marcus Black and Jayne Dunford (both of LDC)
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.