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Bicycles Can Change Lives, Especially In Rural Africa New Report Looks At Their Use In Ghana And Malawi

To many people around the world bicycles are a crucial means of transport, especially for carrying loads in rural areas. While their benefits are h

Engineers make filters from tree branches to purify drinking water

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.

MIT engineers make filters from tree branches to purify drinking water

Engineers make filters from tree branches to purify drinking water

MIT engineers make filters from tree branches to purify drinking water