id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
ap-1582	Čermáková, Jiřina; Mrázek, Jakub; Fliegerová, Kateřina; Tenkrát, Daniel	Replacing Natural Gas by Biogas — Determining the Bacterial Contamination of Biogas by PCR	2012	6	.pdf	application/pdf	3135	160	51	Most of the biogas that is produced comes from treated sewage sludge and biogas plants, and these systems do not contain a pasteurization step. Biogas samples for DNA extraction were collected by filtration through a 0.22 μm nylon membrane fil- ter (Millipore) directly behind the digester and the adsorption unit.	cache/ap-1582.pdf	txt/ap-1582.txt