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Xylem tissue in gymnosperm sapwood can be used for water filtration (as seen on top). Xylem is comprised of conduits that are interconnected by membranes that filter out contaminants present in water (bottom). Credit: N.R. Fuller, Sayo Studio THE interiors of nonflowering trees such as pine and ginkgo contain sapwood lined with straw-like conduits known as xylem, which draw water up through a tree’s trunk and branches. Xylem conduits are interconnected via thin membranes that act as natural sieves, filtering out bubbles from water and sap. MIT engineers have been investigating sapwood’s natural filtering ability, and have previously fabricated simple filters from peeled cross-sections of sapwood branches, demonstrating that the low-tech design effectively filters bacteria.

Rohit karnikAnish antonyMegha hegdeKendra leithKrithika ramchanderAmy smithNature communicationsDepartment of mechanical engineeringLuda wangMechanical engineeringரோஹித் கார்நிக்ஆநிஶ் ஆண்டனிமேகா ஹெக்டேகென்ற லீத்கிருத்திகா ராம்சந்தர்ஆமி ஸ்மித்