For the former, very different investors. Medical, biotech, and agriculture each have their own VC & angel communities. You can choose to position yourself as

For the former, very different investors. Medical, biotech, and agriculture each have their own VC & angel communities. You can choose to position yourself as a more defensible tech company backed by some patents if the core R&D is already complete, e.g. from your phd. In that case you'd be talking to the tech investors. Or, if you're going ongoing heavy R&D before market viability, or there are big non-tech infrastructure costs, you're probably going to want to check in with the alternate investor communities. For example, the UK has big angel networks who invest almost exclusively in product & medical innovations (the same sort of stuff you see on Dragon's Den) and Atlanta has a strong biotech investment community. No idea about brick & mortar.