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 is a column of violently rotating air, spawned by a thunderstorm, which is connected from the thunderstorm cloud to the ground. It often appears funnel shaped or as a column of debris.Tornadoes are one of nature's most violent storms. They may develop suddenly, and may contain winds that reach over 250 mph. Tornadoes are a threat to human life and responsible for millions of dollars worth of property damage each year in North Carolina. tornado is a column of violently rotating air, spawned by a thunderstorm, which is connected from the thunderstorm cloud to the ground. It often appears funnel shaped or as a column of debris.