They secrete and inhabit a permanent calcareous tube attached to hard substrata. Most linguists today refer to these remnants as dialectal strata or substrata. This may be related to the underlying limestone and shale substrata which emits radon gas. Piling foundations are typically preferred for skyscrapers; however, Manchester's sandstone substrata meant a raft foundation. These gametophytes, after reaching the appropriate substrata, grow mitotically to eventually produce gametes. "Substrata" (1997) is a purely atmospheric ambient Biosphere album, released on All Saints Records. Torres Strait Creole shows strong substrata influence in its use of its prepositions. These fishes use their suckers to cling to substrata or to bigger fishes. Typically, Creole languages have multiple substrata, with the actual influence of such languages being indeterminate. Yemeni Arabic has Modern South Arabian, Old South Arabian and Himyaritic substrata. Biomaterial titanium substrata with microgrooves can alter the expression of MTDH in human primary cells. It is recommended animals are reared on natural substrata before release. This has resulted in Tuu and Kx'a substrata in the Khoekhoe languages. In addition, there exist Ketic and Samoyedic substrata. Southern varieties also include distinctive substrata of vocabulary of non-Chinese origin.