A semiconductor device comprising a first transistor device on or in a semiconductor substrate and a second transistor device on or in the substrate. The filter can then be changed or cleaned and easily replaced without disassembly of the vacuum. The invention also provides a crystal of 30S having the three dimensional atomic coordinates of the 30S ribosome, the coordinates being provided in any one of tables 1 to 4. These lysine ester triisocyanates can be used to make biodegradable polyurethanes. A well log track-indicating whether a material behind the casing is a solid, liquid, or gas-may be generated by processing the corrected acoustic cement evaluation data using the refined solid-liquid-gas model. A video decoder receives the bitstream and determines, based on the CBF, whether coefficient blocks associated with TUs that correspond to the leaf nodes include non-zero coefficients.