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.
Warm Front Cold Front. Warm air mass meets Cold air mass overtakes &. & rises above cold air mass pushes under warm air mass. Slow, steady rain Heavy rains, and. Violent thunderstorms. Hot, humid weather follows Fair, cool weather follows. More gentle slope Steeper slope. Warm Front Cold Front. Warm air mass meets Cold air mass overtakes &. & rises above cold air mass pushes under warm air mass. Slow, steady rain Heavy rains, and.