A novel pathway for the synthesis of polyhydroxyalkanoates is provided. The blade of the grading attachment may be rotatable through 360 degrees by a motor and gear assembly. A third supply unit sprays and supplies pure water into the mixing unit. If a bat is modified or otherwise altered after manufacture, the RFID tag will be damaged or missing from the modified bat. The portions have handles that telescopingly fit together and can be locked together. Such gas-monitoring assembly and method specifically employ one or more gas sensors one or more getters arranged and constructed to reduce cross-interference caused by potential presence of the interfering gases in such gaseous environment to be monitored.