Identifying Exchangeable Protons in a 1D NMR Spectrum by Spatially Selective Exchange-Editing.

The front cover artwork is provided by Markus Rotzinger at the University of Graz, Austria. The front cover picture illustrates the way the 1D exchange-editing NMR method makes exchanging protons visible by sign alteration. The depicted spectrum of D-glucose shows all exchanging signals inverted, thus allowing a fast qualitative determination, potentially in a single scan.

Identifying Exchangeable Protons in a 1D NMR Spectrum by Spatially Selective Exchange-Editing.

Signals undergoing chemical or conformational exchange in one-dimensional NMR spectra are often identified by deuterium exchange. In order to obtain quantitative information about the dynamic processes involved, one frequently used method is EXchange SpectroscopY (EXSY). To detect all exchange processes, the EXSY experiment requires the acquisition of time-consuming two-dimensional spectra.

ToxRS bile sensing system.

The seventh pandemic of the diarrheal cholera disease, which began in 1960, is caused by the Gram-negative bacterium . Its environmental persistence provoking recurring sudden outbreaks is enabled by rapid adaption to changing environments involving sensory proteins like ToxR and ToxS. Located at the inner membrane, ToxR and ToxS react to environmental stimuli like bile acid, thereby inducing survival strategies for example bile resistance and virulence regulation.

Synthesis and Properties of Branched Hydrogenated Nonasilanes and Decasilanes.

Branched higher silicon hydrides Si H with n > 6 were recently found to be excellent precursors for the liquid phase deposition of silicon films. Herein we report the gram-scale synthesis of the novel nona- and decasilanes (HSi)Si(SiH) Si(SiH) (2: n = 1, 5: n = 2) from (HSi)SiLi and Cl(SiPh) Cl by a combined salt elimination/dephenylation/hydrogenation approach. Structure elucidation of the target molecules was performed by NMR spectroscopy and X-ray crystallography.