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12-0088-002 Navy Tissue Bank, U.S. Naval Medical School, National Naval Medical Center, Bethesda, MD. March 1958. Routine tissue culture media filtration and also, a fluid change of tissue cultures within the Sterile Room of the Tissue Culture laboratory. With the aid of special electronic filters, bacteriostatic paint and regulation of positive pressure within this room, bacterial colony growth has been reduced to less than 0.6 colonoy within the entire room per hour.