February 14, 2003: Dolly, the world's most famous cloned sheep, is euthenased. She had been suffering from a progressive lung disease caused by Jaagsiekte Sheep Retrovirus. Dolly was born at the Roslin Institute in Edinburgh on 5 July, 1996. On 23 February, 1997, scientists announced that they had accomplished the first mammal cloning from an adult cell by replacing the nucleus of an egg cell with the nucleus from a parent cell – in Dolly's case an udder cell (and the reason she was named after Dolly Parton). The resulting embryo was implanted into the womb of a third, surrogate sheep. The egg cell reprogrammed the donated DNA contained within its new nucleus. Dolly's early death (Finn Dorset sheep are expected to live for 11 to 12 years) raised controversy about the wisdom of cloning.
February 12, 1941: Reserve Constable Albert Alexander becomes the first person to be injected with penicillin. Constable Alexander had scratched his face on a rose bush and the wound had become so badly infected that one of eyes had to be removed. Drs Howard Florey, Ernst Chain and Norman Heatley injected Alexander intravenously and he began recovering. He died a month later when treatment had to be discontinued because there was not enough penicillin available.
- Hits: 2303