Systems and methods are provided for sample processing. Stiffeners are coupled to corresponding board areas along a front of the backplane. Only the shoppers that receive authorization from the seller may bid on or buy the item or service offered for sale by the seller. A method for efficiently utilizing space by mounting the stemware suspenders individually or when associated with base plates so that stemware pieces placed in suspenders on facing surfaces are disposed adjacent to one another. A controller monitors at least one parameter of the fuel cell stack and controls the supply to generate pulses of reactant when the at least one parameter crosses a threshold to flush a second phase fluid from said fuel cell stack. An arithmetical mean roughness Ra of the surface of the fine particles 2 is not larger than 10 nm.