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In some cases , meaningful outreach will depend on new resources , the reallocation of existing resources , or more interdisciplinary activity between units . In some cases , particular photoautotrophs have the ecologically important ability to fix nitrogen from the atmosphere , making it available to the roots of plants . Indeed , in some cases , online work is merely an electronic reproduction of an existing print format , with some of the major advantages of the digital form , such as searchability , tacked on . The BCBS recognises that , in some cases , national authorities may decide to apply these rules not just to banks and banking groups , but also to investment firms or to combined groups of banks and investment firms . while South Africans have attributed their death " to natural causes " , there has been , in some cases , disquieting evidence to the contrary , including the testimony of a world-renowned expert in forensic medicine who stated that electric shock torture had been used by the South African authorities .