I think that’s exactly what people were referring to when they say “culture for specific bacteria”. Remember it’s not a bacteria species that phages target, rather it’s molecular signature on certain bacteria they target, and it’s a constant arms race in the nature, so there could be endlessly many possible kinds of molecular signatures found on what’s technically the exact same species of bacterium.
So they are not “breeding a phage culture for one bacteria”, rather they were breeding phage culture for the 1000 or so kind of molecular signatures, out of millions of trillions possible ones.
Huh? Nothing is stopping you from making a powerplant-on-a-ship, as long as you keep the civilian stuff and the military stuff separate, as they should be. A civilian nuclear powered power ship is a civilian power ship built with a civilian commercial nuclear reactor running on commercial grade reactor fuel available to everybody, a military nuclear submarine or aircraft carrier is a military vessel running on weapon grade nuclear fuel because the military need maximal possible energy density for combat capabilities.
I was explaining why it’s a bad idea to try to use a military vessel as a civilian power ship, but nothing is stopping you from building a ship that’s designed specifically for a nuclear powered civilian power ship from ground up, as China and Russia have both demonstrated already with success.
Most other country just haven’t done this for civil applications because they haven’t had a need for something like this that’s strong enough to justify the extremely high initial upfront cost of a civilian nuclear power ship. Russia has a really big need for this because of the massive economic value of the sea path around the north pole, that tend to get frozen half the year, where there’s no infrustructure to provide power otherwise, and their nuclear power ship doubles as a nuclear icebreaker. And China on the other hand have really big state-subsidized companies who are already heavily invested in building their own commercial nuclear products so it’s kind of like a natural extension to their product line.