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-.
Patents. A process for preparing low molecular weight, highly reactive polyisobutylene having an average molecular weight Mn of from 500 to 5000 Dalton and a terminal double bond content of more than 80 mol % by polymerization in the liquid phase of isobutene or hydrocarbon streams comprising isobutane [sic]...ccording to stage (c) the enriched and/or separated catalyst complex is then recycled, usually without further purification, to the polymerization, in the case of a multi-stage polymerization generally into the first stage. It is generally possible to recycle from 70 to 90% of the catalyst complex.