List of Articles بتولینیک اسید Open Access Article Abstract Page Full-Text 1 - The evaluation of the absorption of some secondary metabolites (betulin, betulinic acid, phenol, flavonoids) and antioxidant activity of wood-inhabiting fungi on Betula pendula(L) Roth. in Golestan province Jameleh Nazari, vahedeh Payamnoor Mohammad Reza Kavosi