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.
The five bases needed: adenine (A) cytosine (C) guanine (G) thymine (T) uracil (U). The sugar component in RNA is ribose and in DNA is deoxyribose (hence the name ribonucleic acid and deoxyribonucleic acid). The third component of nucleotides is the phosphate ion.he five bases needed: adenine (A) cytosine (C) guanine (G) thymine (T) uracil (U). The sugar component in RNA is ribose and in DNA is deoxyribose (hence the name ribonucleic acid and deoxyribonucleic acid). The third component of nucleotides is the phosphate ion.