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Jarnac is a Windows (95/98/NT) based interactive environment for studying models of chemical and biochemical networks. It can for example be used to study metabolic systems, gene regulatory networks or signal transduction pathways. Jarnac supports a text based language that can be used to describe and interrogate metabolic models. This is a similar approach to previous software packages developed by the author, such as Scamp [1, 2], iMap and Indigo [2]. Other approaches exist, such as Gepasi [3, 4] or DBSolve [5] which employ a Windows interface incorporating menus, buttons and lists, or Talis [6] which is a fully interactive visual environment for studying metabolic systems. Jarnac was primarily designed for research purposes but could easily be used in a teaching environment owing to its interactive nature. Jarnac incorporates features not found in other metabolic simulation software, most notably the ability to model populations of pathways, and to manipulate both the structure and kinetics of individual pathways at run time.