Abstract
The aim of this study is to trace the realizations and discourse functions of grammatical subjects in the RA abstracts from two disciplines of Economics and Biology. To this end, fifty research article abstracts from the two disciplines published in journals of Biologica and Economic Modelling were selected. Both of these journals are published by Elsevier and indexed in Thompson and Reuters. The results of the data analysis indicated that there were disciplinary differences concerning the realization of the research related entity, research related event, self-mention and introducing part of study grammatical subjects. The results also indicated that in most of the cases the grammatical subjects were used to serve similar discourse functions in both sets of research article abstracts. The results of this study could in particular help research article abstract writers and readers from the disciplines of Economics and Biology with the knowledge of how GS is applied to serve different discourse functions.