Isolation and identification of Micrococcus roseus and Planococcus sp from Schirmacher oasis, Antarctica.

Five cultures isolated from soil samples collected in Schirmacher oasis, Antarctica, have been identified as members of the family Micrococcaceae, with 3 belonging to the genus Micrococcus and two to Planococcus. The 3 Micrococcus isolates (37R, 45R and 49R) were red-pigmented and h a d ~ 75 mol% G + C in their DNA; they were identified as Micrococcus roseus. The two Planococcus isolates (30Y and Lz3OR) were yellow and orange in colour, and had 43·5 and 40·9 mol % G + C in their DNA respectively; they were identified as Planococcus sp.

The role of cell membrane in the regulation of cell division and malignant transformation.

An earlier model in which uptake of essential nutrients for which the cell is auxotrophic, regulates cell division, is discussed in the light of new experimental findings, specifically the purification of a new type of transport-inhibitory protein from rat liver and the properties of the protein. The possible role of such proteins in malignant transformation is also discussed.