A palatable antimicrobial drug concentrate comprising: a sulfonamide andor sulfonamide salt in aqueous solution; a 2,4-diaminopyrimidine in stable suspension within said solution; and a suspending agent. Also provided are vectors, host cells, and recombinant methods for making and using the novel molecules. The apparatus may be provided with an actuator to move the optical column or a part thereof with respect to the substrate. The dynamic multistreaming processor might also have fetch counters for indicating a next instruction address from which to obtain at least one instruction when the associated instruction queue is not full.