While it is relatively easy to define what a hurricane or earthquake is, defining a drought is more subjective. Droughts do not have the immediate effects of floods, but sustained droughts can cause economic stress throughout an area. The word drought has various meanings, depending on a person's perspective.
For the software package, see Partition function for Interacting RNAs. Piwi-interacting RNA (piRNA) is the largest class of small non-coding RNA molecules expressed in animal cells. piRNAs form RNA-protein complexes through interactions with piwi proteins.
HaeIII is one of many restriction enzymes (endonucleases) discovered since 1970. It was the third endonuclease to be isolated from the Haemophilus aegyptius bacteria, and has a molecular weight of 37126. The enzyme's recognition siteâthe place where it cuts DNA moleculesâis the GGCC nucleotide sequence.This enzyme's gene has been sequenced and cloned.he cleavage occurs between the second and the third nucleotides (G and C). The resulting DNA fragments are known as restriction fragments. HaeIII cuts both strands of DNA in the same location, yielding restriction fragments with blunt ends.