Berkefeld filter
(bĕr′kē-fĕld )
[Wilhelm Berkefeld, Ger. manufacturer, 1836-1897]
A filter of diatomaceous earth designed to allow virus-size particles to pass through.

(bĕr′kē-fĕld )
[Wilhelm Berkefeld, Ger. manufacturer, 1836-1897]
A filter of diatomaceous earth designed to allow virus-size particles to pass through.