Matteo’s first paper as just been accepted in Physical Review Letters!
The paper concerns the following problem: which forces determine the motion of microorganisms through heterogeneous media (think e.g. soil or bottom sediments in lakes or coastal areas)? Current theories are divided in two groups, those that consider this to be mainly a microhydrodynamics problem, and those which do not consider fluid dynamics at all and treat it as a contact interaction problem. So: which one is right? For microorganisms pushing themselves from the back, recent work has shown that the interaction is fundamentally hydrodynamic. Matteo has now shown that for organisms with front-mounted flagella, instead, the situation is much more complex and both fluid-mediated interactions and direct contact have to be taken into account. The paper is not out yet, but you can already read a draft version in the arXiv.
Update: the paper has been published! Check it out here!