The cotton pad dispenser comprises a side wall extending between a top and a bottom end of the dispenser, and an end wall near the bottom end, a plurality of disc-shaped cotton pads being stacked within the dispenser. The bolt includes a seating socket which engages a locking pin to permit travel of the bolt upon disposing the locking pin in a traveling position. The invention further relates to methods for identifying modulators of the TRP8-mediated taste response and the use of such modulators to either inhibit or promote the perception of bitterness or sweetness. The base plate 14 is folded at a central portion 21. The information obtained may be used, for example, to detect the presence or identity of a gas or to determine the material properties of an imaged object.