Immobilized cholesterol oxidase ( COD) membrane with higher catalytic activity is important for biosensor.In this paper, several procedures for immobilizing COD
N-2000 is an admixture for concrete, with a low slump loss, high range water-reducing ratio and long-time retarding. The N-2000 is made up of naphthalene-sulfon
A new method for measuring nano-displacement is discussed. The resolution of shift is as far as 1 nm. The principle of quantum tunneling effects was used to des