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Discovery of DNA components
Friederich Miescher discovery the components of the DNA in the 1869. He was the first to identity DNA as a district molecule. Phoebus Levene was an organic chemist in the early 1900's. He is perhaps best know fos his incorrect tetranucleotide hypothesis of DNA -
Discovery of Nucleic Acids
Friedrich Miescher discovey the Nucleic Acids in 1869. Miescher recognized his isolate as a new type of melocule equal in importance to proteins. He realised that it is an acid of large molecular weight and high phosporus content -
Levene's Tetranucleotide
Phoebus Levene discovery the Tetranucleotide in 1910. Following establishiment that nucleic acids were localized in the cromosomes, early experiments suggested that the four base molecules A.C.G.T occur in the aproximetily equal ratios. -
Griffith's Transformation experiment
Frederick Griffith discovery the experiment of the transformation in 1928 and he's say is the transformation principle and he's use two strains of Streptococcus the type S: Virulent (Deadly) and the type R non-virulent (harmless) -
Avery, MacLeod and McCarty
Oswald Avery, Colin MacLeod and Maclyn McCarty discovery the experiment of Avery, MacLeod and McCarty -
Counting Nucleobases
Erwin Chargaff discovery the Nucleobases in 1952 he's used paper cromatography and UV spectroscopy to examine the abundance of the Nucleobases -
Hershey-Chase experiment
Alfred Hershey and Martha Chase discovery the experiment of DNA is the base of the genetic material in what was called the Hershey and Chase experiment -
Three dimensional DNA
The American biologist James Watson and the physicist Francis Crick proposed the double helix model of DNA to represent the three-dimensional structure of the polymer. -
Dolly the sheep
Scottish researchers present Dolly, a sheep, the first mammal produced by cloning, from an adult cell -
Pampa Mansa
Pampa Mansa is born in Argentina, the first cloned and transgenic calf that produces human growth hormone in its milk