TY JOUR TI INVESTIGATION OF BIOLOGICALLY ACTIVE SUBSTANCES OF DRY EXTRACT FROM SEA BUCKTHORN LEAVES HIPPOPHAE RHAMNONIEDES KW sea buckthorn KW biologically active substances KW dry extract KW phenolic compounds KW tannins KW flavonoids KW vitamins JO Bulletin of KSAU AU Syngeeva, E.V. AU Lamazhapova, G.P. AU Hanturgaev, A.G. AU Kotova, T.I. PY 2025 IS 0 PB Krasnoyarsk State Agrarian University