48.Many,but not all,piezophiles have modified small subunit ribosomal RNA molecules which might alter ribosome function at high pressure.The larger size of the piezphile ribosomal RNAs correlates well with the extent of pressure adaptation. 49.A few of the take home points from this lecture are presented. *Deep-ocean microbial communities are more similar to one another than to those above them. *They are diverse and carry out a variety of biogeochemical transformations of organic and inorganic matter. *The search for more piezophilic microbes continues. *Piezophiles have membrane,membrane protein, DNA replication and motility adaptations to exist at high pressure. 1212 48. Many, but not all, piezophiles have modified small subunit ribosomal RNA molecules which might alter ribosome function at high pressure. The larger size of the piezphile ribosomal RNAs correlates well with the extent of pressure adaptation. 49.A few of the take home points from this lecture are presented. *Deep-ocean microbial communities are more similar to one another than to those above them. *They are diverse and carry out a variety of biogeochemical transformations of organic and inorganic matter. *The search for more piezophilic microbes continues. *Piezophiles have membrane, membrane protein, DNA replication and motility adaptations to exist at high pressure