PURPOSE Membrane-based Tangential Flow Filtration (TFF) unit operations are used for clarifying, concentrating, and purifying proteins. This technical brief is a practical introduction to protein processing using tangential flow filtration. It is intended to help scientists and engineers achieve their protein processing objectives by discussing how the choice of key components and operating par...

We give the first example of systolic freedom over torsion coefficients. The phenomenon is a bit unexpected (contrary to a conjecture of Gromov’s) and more delicate than systolic freedom over the integers. Dedicated to Rob Kirby, a lover of Mathematics and other wild places. Thank you for your inspiration. AMS Classification 53C22