If you’re looking into culturing yeasts you’re going to want to get yourself an alcohol lamp. The cool thing about an alcohol lamp is that it not only can kill air borne yeasts and bacteria on contact of glass or other storage devices. But it also makes a kind of invisible protective shield in your work area.
Basically the vapors from the flame produce a current in the air as the heat rises pushing any dust particles up and way from the base of the flame. Provided you’re not working in a drafty area and the current is being pushed back down, it’s a good way to keep your yeast, wild yeast free.
Photo: Ray Tsang