While efforts are made to improve tissue quality and control preanalytical variables, pathologists are often confronted with the challenge of molecular analysis of patient samples of unknown quality.

The key variables involved in controlling biological waste treatment processes-substrate variables, physical and chemical variables, suspended solids variables, and biological activity variables-are ...

I introduce the notion of a 'control variable' which gives us a way of seeing how mental causation could be an unproblematic case of causation in general, rather than being some sui generis form of ...