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https://www.selleckchem.com/products/fumarate-hydratase-in-1.html 0 and 117.8% in all three spiked levels (5, 25, and 100 ng mL-1). The sensitivity was notably improved compared with solely DART-MS and obtained detection limit decreased by about 50 times. This research provided a rapid, simple, highly sensitive, and efficient approach for analysis of hormones through combination of advantages of ambient mass spectrometry and porous nanomaterials. Graphical abstract.We show that fused deposition modelling (FDM) 3D-printed electrodes can be used for quality control of fuel bioethanol. 3D-printing using carbon black/polylactic acid (CB-PLA) filaments resulted in conductive and biodegradable electrodes for biofuel analysis. As a proof-of-concept, copper determination in fuel bioethanol was performed, as such ions catalyse oxidation processes during storage and transport. Square-wave anodic-stripping voltammetry (SWASV) of copper was achieved after sample dilution in 0.1 mol L-1 HCl as supporting electrolyte (resulting in 3070% v/v ethanolwater). The linear responses were in the range between 10 and 300 μg L-1 (R = 0.999), inter-day precision was lower than 8% (n = 10, for 20 μg L-1) and limits of detection (LOD) and quantification (LOQ) using 180 s as deposition time were 0.097 μg L-1 and 0.323 μg L-1, respectively. Recovery values between 95 and 103% for the analysis of bioethanol spiked with known amounts of copper were obtained. These results show great promise of the application of 3D-printed sensors for the quality control of biofuels. Graphical abstract.When Adolf Hitler annexed Austria to the German Reich in 1938, the famous Jewish oral pathologist Bernhard Gottlieb was in great distress. The Viennese university teacher immediately lost his employment and teaching authority and was forced to emigrate.While Gottlieb's exceptional scientific position in oral pathology is well documented, the complex implications of his deprivation of rights and forced emigration in

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