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.
Early evening thunderstorms are common in summer, and tornados strike the state on a regular basis as Missouri is in America's Tornado Alley. January is the coldest month, with average high temperatures in the low 20's. July is the warmest month, with average high temperatures near 90 degrees. Much hotter summers and colder winters (with significant snow) are not uncommon. Annual precipitation amounts range from 35 to 40 inches in the northern half of the state. In the southern areas, amounts nears 50 inches are the norm.