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-.
The carbon nanopowders synthesised by laser pyrolysis of small hydrocarbons molecules appear to form a family of highly aromatic compounds. The presence of clearly identified polyaromatic layers, even randomly oriented, does not permit to define any of them as stricto sensu amorphous.he infrared laser pyrolysis (IRLP) is a highly versatile method for the production of a wide range of nanopowders [9] , [10] , [11] , [12] , [13] , [14] , [15] and [16] . This process is inherently clean because homogeneous nucleation occurs in a well-defined reaction zone without interaction with inner walls.