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.
El Nino niÃ±o is accompanied by high air pressure in the Western pacific and low air pressure in the Eastern. Pacific the cool phase OF enso is  Called La  nina NIÃ±A with sst in The eastern pacific below average and air pressures high in the eastern and low In. western pacificl Nino NiÃ±o Southern oscillation refers to the cycle of warm and cold, temperatures as measured by sea surface, TEMPERATURE, sst of the tropical central and Eastern Pacific. ocean