Volume 12 No. 3 May – June, 2007 ROMANIAN BIOTECHNOLOGICAL LETTERS – an international journal – CONTENTS 1.ANCA BĂLAŞ, VALENTIN. I. POPAOn characterization of some bioactive compounds extracted from Picea abies bark ……………31612.CAMELIA ELENA OLTEANU, DANIELA ENESCUChitosan involved Tissue Engineering and Regenerative Medicine ……………3167 3.GRADINARU, MANUELA MURARIU, ECATERINA-STELA DRAGAN, and G. DROCHIOIUProtein determination based on the biuret absorption in the UV range and copper binding to peptides ……………31804.RAZMOVSKI, M. ŠĆIBANKinetics of copper(II) and chromium(VI) biosorption by dried waste tea fungal biomass from aqueous solution …………… 31845.STELA POPOVICI, VERONICA STOIAN, DIANA PĂSĂRINLaboratory technologies regarding the obtaining of some biofilms under different working conditions ……………31906.DIANA PASARIN, VERONICA STOIAN, STELA POPOVICIReconversion of oily greases from waste waters with the help of biofilms ……………31947.IRINA LUPESCU, DIANA GROPOSILA-CONSTANTINESCU, STEFANA JURCOANE, CAMELIA DIGUTA, ANDREEA COZEA, LUMINITA TCACENCOProduction of lipase by a strain of the non-conventional yeast Yarrowia lipolytica and isolation of crude enzyme ……………3198 8.ZORICA-ILEANA HERTZOG, R. HERTZOG, AMELIA DOBRESCU, F.BURADA, V.MIXICH, EMILIA BURADANumerical and structural chromosomal changes in a case of autism ……………32059.ARCHANA GAJBHIYE, MANOJ BHANDARKAR, A. B. DONGRE and SUDHIR MESHRAMGenetic Diversity Evaluation of Bacillus isolates using Randomly Amplified Polymorphic DNA molecular marker ……………321210.DIMA STEFAN, GABRIELA BAHRIMIntelligent invertase micro and nanocapsules make and use ……………3219 Cover: The Bucharest University Building