Sulfonylethyl and thioethyl phosphorodiamidates, their preparation and intermediates in their preparation, formulations containing them, and their pharmaceutical use. The invention provides a method of producing a fluororesin aqueous dispersion which comprises subjecting a crude fluororesin aqueous dispersion comprising a polytetrafluoroethylene particle dispersed in an aqueous medium to treatment with an ion-exchange resin and to treatment for concentration by phase separation in the presence of an electrolyte andor a fluorine-free anionic surfactant. Therefore, up to five luminary elements are adapted to be supported in the light source unit for increasing the light intensity of the light source arrangement. A two-way valve mechanism in the housing selectively couples the ventilator-side port into fluid communication with one or the other of the first and second paths. The indirect address device has a memory with memory locations identified by address values loaded into the address register of the indirect address device. A method for testing stool samples for the presence of particular antibodies is also disclosed for diagnosing immunologic food sensitivities.