S.C25.Rm = 470;
S.C25.Rp = 260;
S.C25.d_eff_N_m=16;
S.C25.ad_m=0.3;
S.C25.ad_p=0.4;
S.C30.Rm = 510;
S.C30.Rp = 280;
S.C30.d_eff_N_m=16.5;
S.C30.ad_m=0.35;
S.C30.ad_p=0.45;
S.C40.Rm = 580;
S.C40.Rp = 320;
S.C40.d_eff_N_m=16.6;
S.C40.ad_m=0.36;
S.C40.ad_p=0.46;
S.C50.Rm = 650;
S.C50.Rp = 355;
S.C50.d_eff_N_m=16.7;
S.C50.ad_m=0.37;
S.C50.ad_p=0.47;
save('Datenbank.mat','-struct','S')

name = 'C50'; %dropdown feldname
S = load('Datenbank.mat',name);
S = S.(name);
Rm=S.Rm;