Ferns Edit. In most ferns, gametophyte is a photosynthetic free living organism called a prothallus. For example, in the leptosporangiate fern Dryopteris, the gametophyte is a free-living, autotrophic prothallus that produces gametes and maintains the sporophyte during its early multicellular development.
It is therefore an object of the present invention to provide a gyro stabilized center tracking vehicle, of reduced complexity in which the gyro Spin axis is maintained in its normal position by forces reacting against the earth, and in which these forces are minimized by torquing the gyro frame about its pivot axis.nother object of the invention is to provide a gyro stabilized center-tracking trail vehicle in which a gravity sensitive mass applies a torque to the gyro frame in a direction to erect the vehicle upon tilt from a vertical or plumb line attitude.
For this reason, Minimax decided in favour of argon after long reflection. Argon is a readily available inert gas which is present in the earth's atmosphere in quantities of 0.93 % by volume. It is chemically inert and is not known to have been used for fire extinguishing purposes in the past. Argon will remain stable even in high-temperature environments which makes it suitable to be b Argon has zero ODP. 0 Argon has zero GWP As well as toxic gases formed by the fire, the possible effects of hypoxia on humans must be considered when a fire is to be extinguished by means of an inert gas.