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.
On top of the two-year warm/cold cycle and the El Nino/NiÃ±o La nina niÃ±a pattern is a broader decadal cycle in Which the pacific has a warm and a. Cool phase in, the 1990s the pacific was in a. Warm phase The Strong el nino niÃ±o of 1997 marked the end of. the warm phasen top of the two-year warm/cold cycle and the El Nino/NiÃ±o La nina niÃ±a pattern is a broader decadal cycle in Which the pacific has a warm and a. Cool phase in, the 1990s the pacific was in a. warm phase