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.
The Northwestern Pacific Ocean region is made up of a succession of three tectonic plates. From the most western, moderately-sized and roughly equant Philippine Sea plate, to the small crescent-shaped Marianas Plate and lastly, to the east, the vast Pacific Plate.