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 Pacific Ocean stretches from the shores of Antarctica to the Bering Strait through 135Â° of latitude, some 9,600 miles (15,500 km). Its greatest longitudinal extent measures some 12,000 miles (19,300 km) along latitude 5Â° N, between the coasts of Colombia in South America and the Malay Peninsula in Asia.