1. DETERMINATION OF OPTIMAL EXTRACTION PARAMETERS OF POLYPHENOLS FROM FORSYTHIA EUROPAEA DEGEN & BALD. BLOOM USING RESPONSE SURFACE METHODOLOGY. Authors: GORDANA STOJANOVIC, MARIJA MARKOVIC, SNEŽANA MITIC, MILAN MITIĆ, BILJANA ARSIC, DANIJELA KOSTIC.2. THE INFLUENCE OF AGRICULTURAL SOIL PREPARATION METHODS ON THE PSEUDO-TOTAL ELEMENT CONTENT DETERMINED BY ICP-OES. Authors: GORDANA STOJANOVIC, SNEŽANA TOŠIĆ, SLAĐANA ALAGIĆ, ALEKSANDRA N. PAVLOVIĆ, JELENA MRMOŠANIN, STEFAN PETROVIĆ.