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.
Summers are hot and winters are cold. The western regions are dry and windy. The east is much more humid and receives the majority of the statesâ rain. This falls mostly in spring and summer and which is when Kansas, famously part of Tornado Alley, sees the majority of its tornados.