The Cherenkov effect A charged particle traveling in a dielectric medium with n>1 radiates Cherenkov radiation if its velocity is larger than the phase velocity of light v>c/n or Î² > 1/n (threshold) The emission is due to an asymmetric polarization of the medium in front and at the rear of the particle, giving rise to a varying electric dipole momentum.
cyclo-. 1. Combining forms relating to a circle or cycle; or denoting an association with the ciliary body. 2. In chemistry, a combining form indicating a continuous molecule, without end, or the formation of such a structure between two parts of a molecule.
Cyclin is a regulatory protein that acts as a kind of cofactor of the Cyclin dependent kinase (CDK). Upon complex formation between cyclin and the CDK it becomes an active kinase enzyme. They are indeed the same enzymes as you speculated. As far as I know cyclins are not phosphorylated, as previously mentioned.