Endocytosis is an energy-using process by which cells absorb molecules (such as proteins) by engulfing them. Wikipedia is your friend : Exocytosis... is the durable, energy-consuming process by which a cell directs the contents of secretory vesicles out of the cell membrane and into the extracellular space. and.
I think you are over thinking this problem. I am a woodworker and love working with wood. Water is not good for wood, wax will not clean wood. If you had dirty kitchen cabinets, dirt, wax and grease you would try mineral spirits since it would remove the wax and grease and not raise the grain or remove the finish. Find a hidden area of the floor and give it a light try.
The moisture usually comes from above, seeping through the finish and soaking into the wood, but it can also come from below, if the subfloor is wet. You can kill the mold and get rid of some of the discoloration using wood bleach, but you may have to stain and refinish the floor -- or part of it. There is a big difference between black discoloration that has settled on the surface of your oak flooring and in a discoloration of the wood itself. You can attribute the problem to moisture in both cases, but in the first instance, remediation is fairly straightforward and doesn't involve sanding or refinishing.