The present invention provides a method for varying the melting points and molecular weights of polyolefins by changing the structure of the catalyst used in the polymerization. The unnecessary material suppressing sequence unit generates at least two or more high frequency magnetic field pulses so that the longitudinal magnetization of the unnecessary material is made spatially uniform in the imaging space under application of a first high frequency magnetic field pulse in the main imaging sequence unit. The chain sprocket is axially formed on either side of the frame consisting of the rodless cylinder to install the round stick type chain in a caterpillar form. An internal face of the tubular transition part is acoustically homogeneous also. Thus, devices according to the invention allow for continuous potentiometric pH measurements with occasional spectrophotometric calibrations. In one embodiment, the IFN\u03b1 analog protein has an amino acid sequence that differs from a native human IFN\u03b1 interferon-alpha by one or more amino acid residues in the N-terminal region, comprised of between about residues 1-27, inclusive, by one or more substitutions selected based on the amino acid residue at the corresponding position of a mature interferon-tau protein.