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P. Levene
Levene hypothesized that DNA was made up of equal parts guanine thymine cytosine and adenine. his hypothesis was incorrect. http://en.wikipedia.org/wiki/Phoebus_Levene -
Frederik Griffith
in the year 1928 a scientist, frederik griffith, conducted experiments regarding inheritence by giving mice different mixtures of the pneumonia viruses. he discovered DNA as the genetic material in a cell http://library.thinkquest.org/20830/Textbook/HistoryofDNAResearch.htm -
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Oswald Avery
oswald avery broke down the ribonucleic acids, carbohydrates, proteins and lipids in cells and found the DNA of the pneumonia virus http://library.thinkquest.org/20830/Textbook/HistoryofDNAResearch.htm -
Linus Pauling
Linus Pauling published his discovery of sickle cell anemia http://en.wikipedia.org/wiki/Linus_Pauling#Molecular_genetics -
Erwin Chargaff
in the 1940s a scientist, erwin chargaff, noticed a pattern in the four bases present in DNA; thyamin was almost equal to the adanine, and guanine was almost equal to the amount of cytosine. his results were published in 1950 http://library.thinkquest.org/20830/Textbook/HistoryofDNAResearch.htm -
Linus Pauling
Linus Pauling created a model of DNA, with a triple helix, rather than the double. he was incorrect http://en.wikipedia.org/wiki/Linus_Pauling#Molecular_genetics -
Hershey and Chase
using Felix d'Herelle's discovery of bacterial viruses in 1917, they discovered that it was the DNA that controlled the virus's ability to take over a bacterium, not the proteins. http://library.thinkquest.org/TQ0312650/hersheychase.htm -
James Watson and Francis Crick
in 1953 two scientists, James Watson and Francis Crick, saw Franklin and Wilkin's X-rays of DNA and created the currently used model, the double helix. they discovered, when trying to make this model, that only certain Thymine with Adenine and Guanine with Cytosine would create a uniform look throughout the model. http://library.thinkquest.org/20830/Textbook/HistoryofDNAResearch.htm -
Rosalind Franklin and Maurice Wilkin
rosalind Franklin and Maurice Wilkins worked on creating a model of DNA. it was discovered that DNA crystalized into two different forms. rosalind was given one form to model, franklin was given another. they both succesfully obtained X-ray images of their samples and proceeded to create the models that we use today http://library.thinkquest.org/20830/Textbook/HistoryofDNAResearch.htm
