FORMULATION AND BIOACTIVITY OF LICHEN USNEA SP. EXTRACT AND TiO2 NANOPARTICLES MIXTURE IN A HYDROGEL MATRIX. - Maulidiyah, Maulidiyah; Nurdin, Muhammad; Rafiiqa, Wa Ode Nasyrah; Darmawan, Akhmad; Tien, Tien; Edihar, Muh; Salim, La Ode Agus (Rasayan Journal of Chemistry, 2025)