The present invention relates generally to polyolefin production and to reducing volatile organic content associated with the polyolefin. Subsequently, the apparatus causes a voicemail deletion notification message to be sent to the mobile device, where the voicemail deletion notification message indicates that the voicemail message will be deleted by the voicemail system. The biomarkers can be detected by SELDI mass spectrometry. The monolithic wearing rings are made of a hard materials such as cemented tungsten carbide.