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 warm phase of ENSO is El nino and the Coll phase is La Nina. La Nina cooler & wetter winters in PNW, and warmer is the southern states (SE US),. This statistical connection for PNW winters seems to be best when the pacific decadal oscillation (PDO) is in the cool phase.ou should also be able to answer the above questions for La Nina events. During El Nino events Southern California and the southern US winters are typically [Wetter / Drier]. During La Nina events the Pacific Northwest winters are typically [Wetter / Drier] than average.