The operations drip and mate considered in (mem)brane computing resemble
the operations cut and recombination well known from DNA computing.
We here consider sets of vesicles with multisets of objects on their outside
membrane interacting by drip and mate in two different setups: in test tube
systems, the vesicles may pass from one tube to another one provided they
fulfill specific constraints; in tissue-like P systems, the vesicles are
immediately passed to specified cells after having undergone a drip or mate
operation. In both variants, computational completeness can be obtained,
yet with different constraints for the drip and mate operations. |