Class A (type D) CpG ODNs (CpG-A ODNs) contain a central palindromic phosphodiester (PO) CpG sequence and a PS-modified 3â poly-G tail. The poly G tails form intermolecular tetrads that result in high molecular weight ordered structures.
Why does a tornado form when cold and hot air meet? The collision of warm and cold air is not the direct cause of a tornado, nor is it absolutely necessary. When a cold air mass pushes into a warm air mass (this is called a câ¦old front) the warmer, less dense air is forced upwards.
A tornado on the other hand is a violent rotating column of air that is contact with both the ground as well as a cumulonimbus cloud. A hurricane can cause wind speed of 74mph to over 155mph, compared to a tornado whose wind speeds are between 40mph and 360mph. Tornadoes form on the land, while some can form on water; however a hurricane forms on the water. A hurricane is also known as a tropical cyclone.