Volume 11 No. 4 July – August, 2006 ROMANIAN BIOTECHNOLOGICAL LETTERS – an international journal – CONTENTS 1.IOANA G. PETRISOR, IOAN LAZAREmerging Contaminants – The Problem, Examples and Bioremediation Alternatives Part II ……………27812.ALEXANDRA CRISTINA BLAGA, ANCA-IRINA GALACTION, DAN CAŞCAVALExtraction and transport of aspartic and glutamic acids through liquid membranes ……………27913.DAN DIACONU, CORNELIU ONISCU, CRISTINA VLASE, EUGEN DIACONUStudies regarding the stability of pharmaceutical formulations realized through association of beta-lactamic antibiotics. Stability of an parenteral powder containing oxacillin and ceftriaxone ……………2799 4.LAURA-DORINA DINU, TEOFIL CRĂCIUNHeterogeneous resistance to salt stress in yeast …………… 28075.DANIELA TELEMAN, PETER KREIS, SEBASTIAN LAUTERBACH, CARMEN TEODOSIU, ION BALASANIANDetermination of optimum operational conditions for pervaporation of binary mixture water/1-propanol and ternary mixture water/1-propanol/propionic acid ……………28196.MIHAELA DĂNĂILĂ, VALENTIN. I. POPA, IRINA VOLFThe effect of adding natural polyphenolic compounds on yeast fermentation and wine quality ……………28337.AMJAD MASOOD, GERARD ABRAHAMPhysiological response of Azolla pinnata plants to salinity stress ……………28418.CORINA CERNATESCU, EUGENIA COMANIŢĂBenzazole derivatives. IX. 2-(4’-aminophenyl)- and 2-(4’-aminophenyl)-1-methyl-benzimidazoles Reactions with phenolic aldehydes ……………2845 9.MARIANA BEZDADEA, MILITINA BOURCEANUBiomimethics effects during formation of membranes ……………2851 Cover: The Bucharest University Building