Stephan Noll, Jan Reyelt, Thomas Rysiok, Roland Kellner, Detlef Güssow, Stefan Jäkel, Stefanie Hager, Harald Kranz
Red/ET recombination allows for extensive and base-precise manipulations of the Escherichia coli genome. Here we describe how this technology can be applied to improve the performance of the common expression host E. coli BL21(DE3): deletion of the DE3 sequence dispensable for T7-based gene expression enhances strain safety while recovery of the chromosomal phosphogluconolactonase activity prevent...... hiện toàn bộ
Tests for cytotoxicity–respectively biocompatibility–are performed e. g. for biological evaluation of medical devices or during the development of microphysiometric systems. Here, often cell culture methods which involve the use of fetal bovine serum (FBS) are employed. However, using FBS raises scientific and ethical concerns. In the presented work a protocol for a chemically defined test for cyt...... hiện toàn bộ