History of Portsmouth city to new developments such as Paulsgrove and Leigh Park. On 4 July 1968, an estimated 250,000 people witnessed the return of Alec Rose, a greengrocer in Osborne Road, after he completed his single-handed circumnavigation in "Lively Lady"; he was immediately knighted and made a Freeman of the city. 400 motor-boats, yachts, catamarans and canoes welcomed him into harbour. The University of Portsmouth gained university status in 1992 In 2003 erection was started of a 552 feet high Spinnaker Tower sited at Portsmouth Harbour, and celebrating the city's maritime tradition. Completed in 2005, the tower has twin concrete legs meeting
Effective number of codons Effective number of codons Effective number of codons (abbreviated as ENC or "Nc") is a measure to study the state of codon usage biases in genes and genomes. The way that ENC is computed has obvious similarities to the computation of effective population size in population genetics. Although it is easy to compute ENC values, it has been shown that this measure is one of the best measures to show codon usage bias. Since the original suggestion of the ENC, several investigators have tried to improve the method, but it seems that there is much room to improve this measure.