The invention pertains to a method for preparing cells that can be used as biocatalysts by inducing in them a growth-decoupled state, in which interferase inhibits the expression of genes except the ones that code for the pathway enzymes of interest. Each auxiliary element may include a slave SWP interface connected to a same master SWP interface of the contactless element through a SWP link, and a management module configured for activating at once only one slave SWP interface on the SWP link. The first transport roller is disposed upstream of the skew correcting mechanism. A learning module records characteristics associated with each program viewed by the user, and forms sets of these characteristics. The other end of the third link is rotatably connected to the coupling.