A demountable plasma torch assembly suitable for use in ICP spectrometry comprises a first tube having an inner diameter and a second tube disposed concentrically within the first tube, wherein the second tube has an outer diameter that is less than the inner diameter of the first tube. The third nitride semiconductor layer has a thickness greater in a portion below the gate electrode than in a portion below the side of the gate electrode. The master latch has an input to accept a shadow-D1 signal, an input to accept the clock signal, and an output to supply a shadow-D2 signal and the inverted shadow-D2 signal. This method lays a fundament for automatic identification of harmful objects, such as explosive, drugs, etc. The tube fitting further comprises a front ferrule having an axially-extending rear portion radially outwardly spaced from the rear ferrule, whereby when the rear ferrule is urged axially in a first direction the rear ferrule grips the tube, and whereby the rear portion of the front ferrule reduces buckling of the rear ferrule. The invention also encompasses certain pharmaceutical compositions and methods for treating cyclooxygenase-2 mediated diseases comprising the use of compounds of Formula 1.