This invention relates to compounds of the formulawherein a, R1, R2, R3, R4, R5, R6 and X are each as defined above, and to pharmaceutically acceptable salts thereof, useful as potent antibacterial and antiprotozoal agents that may be used to treat various bacterial and protozoal infections and disorders related to such infections. The first louver includes first rectifier vanes that direct airflow produced by the fan. In one exemplary embodiment, the transport systems and methods of the present invention are used in conjunction with the International Business Machine Corporation Geographically-Dispersed Parallel Sysplex integrated, automated application and data availability solution to meet andor exceed the associated 10 microseconds transmitreceive path differential delay requirement. Wood, including cut wood, prepared by such methods are further described herein. The chemisorbed first species is contacted with a second precursor plasma effective to react with the first species monolayer to remove organic groups from the first species monolayer.