摘要:
MINOR ADDITIONS OF POLYVINYL PYRROLIDONE AND MELAMINE-FORMALDEHYDE RESINS TO PLASTER OF PARIS BANDAGES PERMIT MAKING "CASTS" OF IMPROVED STRENGTH AND WATERRESISTANCE WITH GOOD PHYSIOLOGICAL PROPERTIES.
摘要:
A FUNNEL-SHAPED CHAMBER APPARATUS IS PROVIDED FOR PASSAGE THERETHROUGH OF UPWARDLY FLOWING FLUID MEDIUM ADAPTED FOR THE MAINTENANCE AND/OR GROWTH OF LIVING CELLS IN SUSPENSION. IN USE, THE MEDIUM AND THE CELLS ARE INTRODUCED INTO THE CHAMBER AND FRESH MEDIUM IS PUT IN AT A CONTINUOUS RATE AT LEAST SUFFICIENT TO KEEP THE CELLS SUSPENDED. THE LIVING CELL POPULATION DISTRIBUTES ACCORDING TO SIZE VERTICALLY IN THE CHAMBER (OR SERIES OF SUCCESSIVELY LARGER CHAMBERS) AND THUS CAN BE FRACTIONATED FOR SIZE. ALSO, BACTERIA, VIRUSES AND OTHER MICROBIOLOGICAL ENTITIES AS DESIRED CAN BE CONTINUOUSLY CULTIVATED ON THE LIVING CELLS FOR HARVESTING EITHER INTERMITTENTLY OR CONTINUOUSLY.