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|Title / Authors / Details||Open Access||Download|
Serogroups O2 and O3 of Serratia marcescens are differentiated by acidic glycans present in the aqueous phase when lipopolysaccharides are extracted from the reference strains by the aqueous-phenol method. The phenolic phases of these extracts from both strains also contain lipopolysaccharides, from which the same neutral glycan is released on milk acid hydrolysis. The neutral glycan has the disaccharide repeating-unit shown, and accounts for the cross-reactions between the two serogroups and also with serogroup O21: --> 4)-alpha-D-GlcpNAc-(1-->4)-beta-D-ManpNAc-(1--.+ View Abstract
We have used the Smoldyn software to create spatially detailed models of the Escherichia coli chemotaxis pathway. With it we can follow signalling reactions at high spatio-temporal resolution, observe the formation of gradients of phospho-proteins as well as total protein and analyse the effects of macromolecular crowding on signalling. It has enabled us to propose new regulatory elements of the signalling pathway, which are mediated through the dynamic localisation and activity of the CheZ phosphatase. We used the Smoldyn software to model quantitative fluorescent microscopy data and to determine diffusion coefficients and binding affinities. We can reliably gain information obtained under conditions with high levels of experimental noise. Smoldyn can accommodate various cellular architectures, and we show that cell shape becomes an integral part of the signalling process.+ View Abstract