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 warm front has/brings nice warm weather. Warm fronts most often bring cloud weather with light to moderate snow flurries or rain showers. Thunderstorms can occur, but not often. Before the warm front passes, the temperature is cool with significant precipitation (depending on geography) such as rain or snow or sleet. While the front passes, the temperature warms suddenly with light precipitation. Afterwards, the temperature remains warm with little or no precipitation and few clouds.