NUMEROUS paper chromatographic methods exist for the detection of keto-acids as their 2,4-dinitro-phenylhydrazone, semicarbazone, and quinoxaline derivatives or as the free acids 1. By the ninhydrin ...
DURING an investigation of the physiology of the pitcher of Nepenthes, methods suitable for a field laboratory were required for estimating amino-acids produced during ‘digestion’ and for estimating ...
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