Best Times to Go to Florence, Italy. Avoid summers if you can, it's hot and packed with sweating tourists in July and August. That said, there's hardly a time you won't encounter tourists in Florence. If you must go in summer, make hotel reservations early.
Helical. Helical (adjective) is having a spiral form of many rounds. Helical can be a hairstyle curl, loop fold of a ribbon that serves as pony and a repeated dialogue of an actor that gives twist to the audience.
[2] Another explanation of the Helical structure comes from the solubility of different parts of DNA in water.The sugar and phosphates are hydrophilic but the bases (A,T,C,G) are hydrophobic. Bases become water-soluble once they attach to a sugar and a phosphate to form a nucleotide.