This issue of the journal reports regular papers. The first contribution is by
Paras Chopra and Andreas Bender and discusses quantitative modelling aspects
of the bgl operon for E.coli. The second contribution is by Rodrick Wallace and
Deborah Wallace and deals with ecosystem transitions affecting phenotype expressions
and selection mechanisms. The techniques used are statistical models.
The third contribution is by Roberto Barbuti, Andrea Maggiolo-Schettini, Paolo
Milazzo, Paolo Tiberi and Angelo Troina and presents the Stochastic Calculus
of Looping Sequences (SCLS) suitable for the description of microbiological systems,
such as cellular pathways, and their evolution. The last contribution is
by Federica Ciocchetta and describes the use of biological transactions to make
atomic sequences of interactions in the BlenX language.