  We introduce a new method for transforming chemical systems into desired
logical operators (e.g. NAND-gates) or similar signal-manipulation components.
The method is based upon open-loop dynamic regulation, where external
conditions such as feed-rate, lighting conditions, etc. are modulated according
to a prescribed temporal sequence that is independent of the input to the
network. The method is first introduced using a simple didactic model. We then
show its application in transforming a well-stirred cubic autocatalytic
reaction (often referred to as the Selkov-Gray-Scott model) into a logical
NAND-gate. We also comment on the applicability of the method to biological and
other systems.
