In cell culture biology, confluence is the term commonly used as an estimate of the number of adherent cells in a culture dish or a flask, referring to the proportion of the surface which is covered by cells.or example, 50 percent confluence means roughly half of the surface is covered and there is still room for cells to grow. 100 percent confluence means the surface is completely covered by the cells, and no more room is left for the cells to grow as a monolayer.
One of the few external rigid points on the GZ-20âs envelope, it holds the battens, attachments for the nose lines and the mooring spindle. 2. Material. The largest component of the Blimp, the GZ-20âs envelope is made of two-ply, neoprene-impregnated polyester fabric. 3. Ballonet. Located in the forward and aft of the envelope, these air bags allow the pilot to regulate the amount of helium in the Blimp and statically trim the ship in a nose-up or nose-down situation.
In total, there are fewer than 50 blimps in the world today. While the cigar-shaped balloon looks similar to the old solid-frame airships, the blimpâs balloon body has no frame and is kept in shape by air pressure. If the Zeppelin be excepted, the blimp is the most highly-developed and scientific heavier-than-air flying machine ever devised. In effect, the blimp is a combination of balloon and aeroplane. In order to hold whatever position in the air may be desired, the blimp is equipped with two horizontal fins and three vertical fins. It was believed to be an American blimp, though the darknessâit was eleven at nightâprevented observers from being sure.