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.
They are a part of a natural cycle known as the El NinoâNiÃ±o Southern (OSCILLATION) enso and are associated with a sustained (period many) months of (Warming El) nino niÃ±o (Or Cooling) la nina niÃ±a in the central And. Eastern TROPICAL pacific the enso cycle loosely operates over timescales from one. to eight years