Blood type (or blood group) is determined, in part, by the ABO blood group antigens present on red blood cells. A blood type (also called a blood group) is a classification of blood based on the presence or absence of inherited antigenic substances on the surface of red blood cells (RBCs).These antigens may be proteins, carbohydrates, glycoproteins, or glycolipids, depending on the blood group system. blood type (also called a blood group) is a classification of blood based on the presence or absence of inherited antigenic substances on the surface of red blood cells (RBCs).
Received July 13, 1990. DNA polymerase from Thermus aquaticus has be-. come a common reagent in molecular biology because of. its utility in DNA amplification and DNA sequencing. protocols. A simplified method is described here for iso-. lating the recombinant Taq enzyme after overproduc-. tion in Escherichia coli. Purification requires 8 to 10 h. and entails heat treating and clearing the E. coli lysate, followed by precipitation of the enzyme with polyethy-.
In 1970, DNA polymerase II of E. coli was isolated and characterized by Arthur Kornbergâs son, Thomas Kornberg (Kornberg and Gefter 1970). DNA polymerase II was also independently reported on by Knippers and by Moses and Richardson in 1970 (Moses and Richardson 1970b).he new chain is base-paired with the template, and the new chain and template are antiparallel. DNA polymerase I is the most abundant polymerase and functions to fill gaps in DNA that arise during DNA replication, repair, and recombination. History: DNA polymerase I was discovered by Arthur Kornberg et al. in 1956.