Input-driven pushdown automata (IDPDA) are where the next action on store (push, pop, nothing) is solely governed by input symbol. Nowadays such devices usually defined that popping from empty does not block computation but continues it with pushdown. Here, we consider IDPDAs have a more balanced behavior concerning pushing and popping. Digging input-driven (DIDPDA) basically that, when forced ...

Chemists at Abbott Laboratories are totally dependent on a rapid return of spectroscopic data on their intermediates and synthetic products to ensure that their chemical reactions are on track. Eight years ago, chemists at Abbott often had to wait three days to a week to receive this data, and had to start new reactions without it. That this was an unacceptable situation was clearly recognized ...

An analysis of bacterial communities in soil samples from around the world reveals unexplored diversity in biosynthetic enzymes.