The present invention relates to a fatty acid 5-desaturase able to catalyze the conversion of dihomo-gamma-linolenic acid to arachidonic acid. Such embodiments include forming metal-containing dielectric layers over a silicon-containing substrate where a metal-containing layer is first formed and that treated to form a dielectric layer. a seal, attached to the product, and the year and month of using the calendar can be determined freely with reference to the part of days. The host material is then cooled from the vapor outlet side to progressively condense the vapor in the holes in the direction from the outlet side to the inlet side to progressively form nanowires of the bismuth-based material in the pores.