1. ISOTOPIC INVESTIGATIONS ON THE MINERAL WATERS FROM SOMESENI – CLUJ, ROMANIA. Authors: STELA CUNA, PETRE BERDEA, CÄ‚LIN BACIU.2. PRELIMINARY STUDY OF DEUTERIUM DEPLETED WATER EFFECT ON THE LIVE CELLS BY ISOTOPIC RATIO MASS SPECTROMETRY. Authors: PETRE BERDEA, STELA CUNA, CORNEL CUNA, GABRIELA BALAS.3. PRELIMINARY RESULTS IN THE STUDY OF THE ECOSYSTEMS IN POLAR AREAS USING STABLE ISOTOPES. Authors: STELA CUNA, TEODOR NEGOITA, PETRE BERDEA, GABRIELA BALAS, CORNEL CUNA, NICOLAE LUPSA, VALENTIN MIREL.