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.
One exception to the warmth is a narrow strip of cold water along the Pacific Northwest Coast fed by upwelling from the deep ocean. The situation does not match recognized patterns in ocean conditions such as El NiÃ±o Southern Oscillation or Pacific Decadal Oscillation, which are known to affect marine food webs.