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About: Bowen's Kale     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:SystemOfMeasurement113577171, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: yago:WikicatBritishStandardsyago:Abstraction100002137yago:Measure100033615yago:Standard107260623yago:SystemOfMeasurement113577171 New Facet based on Instances of this Class

Bowen's Kale was a reference material produced by British chemist Humphry Bowen and used for the calibration of early scientific instruments intended to measure trace elements during the 1960s. With Peter Cawse, Bowen grew, dried, and crushed a large amount of marrow-stem kale (Brassica oleracea var. medullosa) into 100 kilograms (220 lb) of a homogeneous and stable powder in 1960 that was subsequently freely distributed to researchers around the world for over two decades. This was probably the first successful example of such a de facto standard. Bowen's Kale stimulated preparation of further materials by other organizations for similar use.