MARY PREVITEâS SPEECH AT THE SIXTIETH ANNIVERSARY CELEBRATION OF THE LIBERATION OF THE WEIHSIEN CONCENTRATION CAMP. August 17, 2005 Weifang, Shandong Province, China. Honorable Mayor Zhang Xinqi, honorable friends of Weifang, you have earned our deepest gratitude by inviting us here to celebrate this Day of Liberation.
TIL that in 1669, Hennig Brand discovered phosphorus by boiling down urine and heating the residue to very high temperatures. He was trying to make gold though, and he hoped that the yellow color of urine meant there was gold in it. (chemicool.com) submitted 4 years ago by virnovus 8. 89 comments; share; save
DNA was labeled with radioactive phosphorus. Proteins were labeled with radioactive sulfer. DNA did not have sulfer, and the majority of the phosphorus in the phage was in the DNA. Describe by which Hershey and Chase established that only the DNA of a phage enters and E. coli cell. E. coli were infected by the phage, and there was more radioactive phosphorus that entered.