Reverse transcriptase is characteristic of retroviruses, including HIV (human immunodeficiency virus), the virus responsible for AIDS (acquired immunodeficiency syndrome). All retroviruses encode a polymerase enzyme in their pol gene that is both necessary and sufficient for the replication of their RNA genomes.
PDO positive phase global pattern. The Pacific Decadal Oscillation (PDO) is a robust, recurring pattern of ocean-atmosphere climate variability centered over the mid-latitude Pacific basin.
An oscillation is defined as a periodic phenomenon or vibration around a point of equilibrium. There are two primary types of oscillations, but both follow the aforementioned definition.or instance, a compressional wave is technically an oscillation, but it is somewhat hard to observe its periodic motion unless one can either see it from the right angle or knows that for which to look. An easy way to check if something is an oscillation is to see if the phenomenon has an equilibrium point.