Berkefeld
(ˈbɜːkfɛld, -ɛlt)
Also (erron.) Berkefield.
The name of W. Berkefeld (1836–1897), German mine-owner, used to designate a bacterial filter containing diatomaceous earth.
| 1894 Brit. Med. Jrnl. 29 Dec. 1489/2 We must conclude that the Berkefeld filters may afford an efficient safeguard against the passage of disease germs. Ibid. 1488/2 The Berkefeld Filter Company Ltd. 1902 Encycl. Brit. XXXIII. 790/1 The Berkefield filter, constructed of baked infusorial earth. 1946 Nature 17 Aug. 217/2 Preparing from the eggs Berkefeld filtrates. 1951 R. J. Ludford in G. H. Bourne Cytology (ed. 2) ix. 402 A filterable tumour..yields by Berkefeld-filtration a cell-free filtrate. |