Non-production wafers of polycrystalline silicon are placed in non-production slots of a support tower for thermal processing monocrystalline silicon wafers. Pyrimidine derivatives represented by the following formula : . The cylinders each have a rod that extends beyond the mold frame joining the opposed, exterior sides. For example, a user having a developer role can have abilities to redeploy a web application that is currently in development to a test environment.