Nobel lecture by Christian de Duve, delivered 12 December 1974. This is the lecture date, not an established online publication date. NobelPrize.org hosts the official document; the inspected text was a transcription on Doczz because the official PDF could not be fetched.
Cited passages: printed pp. 152–159, Figures 1–7, fractionation and enzyme latency; pp. 161–164, microscopy. This is a primary investigator’s retrospective account; it does not replace direct inspection of the original assay paper.
By Jacques Berthet and Christian de Duve, credited as J. Berthet and C. de Duve. Published in Biochemical Journal 50(2), 174–181, December 1951; received 28 March 1951. The received date is distinct from publication. Portland Press hosts the publisher PDF.
Inspected passage: indexed first-page text, printed p. 174, introduction and Methods, Fractionation of tissue constituents. The full original PDF and subsequent pages were not inspected; this locator does not support claims about unseen tables, numerical activity magnitudes, exact spin settings or specific disruption reagents.