guhr dynamite in reference to the kieselguhr. The Celle engineer, Wilhelm Berkefeld, recognized the ability of the diatomaceous earth to filter and developed...
40 KB (4,357 words) - 01:45, 9 August 2024
secretions from patients infected with the 1918 flu and passed them through Berkefeld filters, which exclude bacteria. The infectious agent — which caused lung...
9 KB (867 words) - 18:19, 29 October 2023