It is reported that fermentative liquids with various concentrations of La and Nd affect the fer-mentation of alginic acid from the strain 342 of Azotobacter vi
The effects of the partial substitution of element M(M=Cr,V,Mn,x=0.05;Zr,Ga,x=0.017;Si,x=0.15;Co,x=0.10)for Fe in samarium-iron-nitride Sm<sub>2</sub>(Fe<sub>1-x<
Under the excitation of UV light and cathode ray,the dependence of the excitation and emission spectraand luminescent lifetime of Eu<sup>3+</sup>and Bi<sup>3+</