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・ Johan Niklasson
・ Johan Nilsson
・ Johan Nilsson (wrestler)
・ Johan Nilsson Guiomar
・ Johan Jüngling
・ Johan Kamminga
・ Johan Kankkonen
・ Johan Kappelhof
・ Johan Karlsson
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・ Johan Kemper
・ Johan Kenkhuis
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Johan Kjeldahl
・ Johan Kjelsberg
・ Johan Kjær Hansen
・ Johan Kjølstad
・ Johan Klehs
・ Johan Kleppe
・ Johan Kling
・ Johan Kobborg
・ Johan Kock
・ Johan Koren Christie
・ Johan Koren Christie (air force officer)
・ Johan Koren Christie (writer)
・ Johan Kraag
・ Johan Kremers
・ Johan Kriek


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Johan Kjeldahl : ウィキペディア英語版
Johan Kjeldahl

Johan Gustav Christoffer Thorsager Kjeldahl ((:johan ˈkʰɛld̥æːˀl) 1849–1900), was a Danish chemist who developed a method for determining the amount of nitrogen in certain organic compounds using a laboratory technique which was named the Kjeldahl method after him.〔Kjeldahl, J. (1883) ("Neue Methode zur Bestimmung des Stickstoffs in organischen Körpern" ) (New method for the determination of nitrogen in organic substances), ''Zeitschrift für analytische Chemie'', 22 (1) : 366-383.〕
==Professional life==
Kjeldahl worked in Copenhagen at the Carlsberg Laboratory, associated with Carlsberg Brewery, where he was head of the ''Chemistry department'' from 1876 to 1900.
He was given the job to determine the amount of protein in the grain used in the malt industry. Less protein meant more beer. Kjeldahl found the answer was in developing a technique to determine nitrogen with accuracy but existing methods in analytical chemistry related to proteins and biochemistry at the time were far from accurate.

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