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.
What is the coldest temperature ever recorded in Toronto? The coldest temperature recorded at Toronto Pearson International Airport was â31.3 Â°C (â24.3 Â°F) on January 4, 1981, and the coldest windchill recorded was â44.7 (â â¦ 48.5) on the same day.