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121.
We present a tunable diode laser spectrometer that can be software-switched between a wavelength modulation spectroscopy (WMS)
operation mode and the direct absorption spectroscopy (DAS) technique on a per-scan basis. The new setup allows a direct comparison
between the two techniques under equal hardware and system environment conditions. In this work, we compare the impact of
analog-to-digital converter resolution for operation in WMS and DAS mode. Example concentration evaluations show that in the
DAS approach, relative absorptions smaller than the least significant bit can be measured with scan averaging and FIR-filtering
applied. With full resolution, both techniques show similar performance in our setup, with a slight advantage for the WMS
implementation. 相似文献
122.
Melanie Heghmanns Andreas Rutz Yury Kutin Vera Engelbrecht Martin Winkler Thomas Happe Müge Kasanmascheff 《Chemical science》2022,13(24):7289
[FeFe]-hydrogenases catalyze the reversible conversion of molecular hydrogen into protons and electrons with remarkable efficiency. However, their industrial applications are limited by their oxygen sensitivity. Recently, it was shown that the [FeFe]-hydrogenase from Clostridium beijerinckii (CbA5H) is oxygen-resistant and can be reactivated after oxygen exposure. In this work, we used multifrequency continuous wave and pulsed electron paramagnetic resonance (EPR) spectroscopy to characterize the active center of CbA5H, the H-cluster. Under oxidizing conditions, the spectra were dominated by an additional and unprecedented radical species. The generation of this radical signal depends on the presence of an intact H-cluster and a complete proton transfer pathway including the bridging azadithiolate ligand. Selective 57Fe enrichment combined with isotope-sensitive electron-nuclear double resonance (ENDOR) spectroscopy revealed a spin density distribution that resembles an H-cluster state. Overall, we uncovered a radical species in CbA5H that is potentially involved in the redox sensing of CbA5H.Electron paramagnetic resonance spectroscopy revealed an unprecedented radical species in the oxygen-resistant [FeFe]-hydrogenase CbA5H. Analysis of the isotope-sensitive data suggests that it is related to the active site, the H-cluster. 相似文献
123.
Peets Tanel Tamm Kert Engelbrecht Jüri 《The European physical journal. E, Soft matter》2023,46(5):1-12
The European Physical Journal E - Inference problems for two-dimensional snapshots of rotating turbulent flows are studied. We perform a systematic quantitative benchmark of point-wise and... 相似文献