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.
Definition of oscillation. 1  1 : the action or state of oscillating stays can be effectively used to prevent oscillations in new bridges â D. B. Steinman. 2  2 : variation, fluctuation famines due to excessive storminess and violent oscillations of rain and drought, heat and cold â Ellsworth Huntington.