Effect of major metal ions in DOW on the cordycepin (a) and adenosine (b) production of C. militaris-fermented oats in solid culture. The concentration of Mg2+, Na+, K+, Ca2+, Fe2+ in Mg(NO3)2, NaCl, KCl, CaCO3, and (NH4)2Fe(SO4)2 were equal to that in 10X-DOW, respectively. Salt-SW was a mixture of the five salt solutions. Data are presented as mean ± SD (n = 3). *, *** indicated the significant difference (p < 0.05, p < 0.001, respectively) as compared with UPW.