 Here you see unicellular microorganisms called tetrahymenide pyreformus, acyliated protozoa. We see the microorganisms in a diffusion chamber under the microscope. They appear blue because they have taken up the chemical parylene, which emits blue light when exposed to UV light, as we see here under the fluorescence microscope. With the organisms as carriers, parylene can be transported across the diffusion barrier in the chamber. Organisms in the zinc side that do not carry the chemicals are transparent and can only be seen in the normal light microscope mode. Here we now see the microorganisms transporting chemicals under a combination of both normal light and fluorescent light emitted from fluency. This chemical belongs like parylene to the group of polycyclic aromatic hydrocarbons, PAHs. These chemicals have very low solubility in water. Instead, they prefer being dissolved in lipid-like phases. Therefore, they partition into the lipid membrane of the organisms and can be transported with them. This is the first time such transport is documented. On the microscale, such co-transport is much more effective compared to molecular diffusion because of the elevated concentrations in the microorganisms and their ability to move actively.