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Aufsatz
Cross-π-conjugated enediyne with multioptic metal binding sites
(2020-10-20)
The synthesis of an enediyne molecule functionlized with different metal coordination sites in a cross-pconjugated fashion is reported. Using Pd-mediated cross-coupling reactions, 2,20-bipyridine units were attached at the periphery of diazafluorenemethylidene to obtain a multitopic ligand. UV-vis spectrosopic investigations along with electrochemical analyses reveal electronic communication along the conjugated path reflected in red-shifted absorption spectra and shifts of reduction potentials. The properties of the ...
Aufsatz
Electrostatic Body Forces and their Implications for Cracks
(2023-03-24)
A Griffith-type crack in a dielectric solid under electromechanical loading is investigated by numerically solving the combined boundary value problem. The focus is on the contribution of electrostatically induced body forces, coming along with the still controversially discussed Maxwell stress tensor, to the crack tip loading. A 1/r-singularity of compressive stress is found to evolve at the crack tip, however, just being dominant over the mechanically induced 1/√r-behavior within a very small region
Aufsatz
Water Quality in Surface Water: A Preliminary Assessment of Heavy Metal Contamination of the Mashavera River, Georgia
(2018-03-23)
Water quality contamination by heavy metal pollution has severe effects on public health. In the Mashavera River Basin, an important agricultural area for the national food system in Georgia (e.g., vegetable, dairy and wine production), water contamination has multiple influences on the regional and country-wide health. With new industrial activities in the region, sediment extraction, and discharge of untreated wastewater into the river, its tributaries and irrigation canals, a comprehensive study of water quality ...
Aufsatz
The Positive Facet of Self-compassion Predicts Self-reported Use of and Attitudes toward Desirable Difficulties in Learning
(2017-08-09)
Previous research found that introducing difficulties and challenges during learning has desirable outcomes. With the present work, we investigated the question how the use of and the attitudes toward such learning strategies (so-called desirable difficulties) are related to self-compassion, a concept that describes the tendency to be understanding and kind to oneself when confronted with negative experiences. Evidence suggests self-compassion to be linked to less fear of failing, and further to higher control beliefs ...
Aufsatz
tRNA anticodon loop modifications ensure protein homeostasis and cell morphogenesis in yeast
(2016-08-05)
Using budding yeast, we investigated a negative interaction network among genes for tRNA modifications previously implicated in anticodon-codon interaction: 5-methoxy-carbonyl-methyl-2-thio-uridine (mcm5s2U34: ELP3, URM1), pseudouridine (Ψ38/39: DEG1) and cyclic N6-threonyl-carbamoyl-adenosine (ct6A37: TCD1). In line with functional cross talk between these modifications, we find that combined removal of either ct6A37 or Ψ38/39 and mcm5U34 or s2U34 results in morphologically altered cells with synthetic growth defects. ...
Aufsatz
Who Buys Products with Nutrition and Health Claims? A Purchase Simulation with Eye Tracking on the Influence of Consumers’ Nutrition Knowledge and Health Motivation
(2019-09-12)
Nutrition and health claims are seen as a way of promoting healthy aspects of food. However, the results of previous studies have been contradictory regarding the effect of these claims on purchase. This study aims to achieve a better understanding of how the consumer characteristics ‘nutrition knowledge’ and ‘health motivation’ influence the purchase of products with nutrition and health claims and what role gaze behavior plays. We included gaze behavior in our analysis, as visual attention on the claims is a ...
Aufsatz
Die Alternative für Deutschland
(2020-02-17)
Die AfD hat es binnen kurzer Zeit geschafft, in alle deutsche Landesparlamente einzuziehen sowie als Bundestags-Novizin die größte Oppositionsfraktion zu stellen. Gleichwohl bleibt sie mit ihren inneren Dynamiken, den Wandlungs- und Transformationsprozessen sowie der heterogenen Koalition von bewegungs- und parlamentsorientierten Kräften ein rätselhaftes Phänomen. Vor diesem Hintergrund beleuchtet der Beitrag die Entwicklung der Partei, ihr programmatisches und parlamentarisches Profil sowie die Abgrenzung und ...
Aufsatz
Transmission Electron Microscopy Study on the Precipitation Behaviors of Laser-Welded Ferritic Stainless Steels and Their Implications on Intergranular Corrosion Resistance
(2022-01-04)
The intergranular corrosion susceptibility of ferritic stainless-steel weldments is strongly dependent on chromium carbide precipitation phenomena. Hence, stabilization is widely used to mitigate the aforementioned precipitation. In contrast, stabilization has proved ineffective to fully prevent intergranular corrosion due to segregation of unreacted chromium during solid-state heat-treatments. To analyze the precipitation behavior of 17 wt.-% chromium ferritic stainless steels during laser welding, sheets of ...
Aufsatz
N-tert-Alkyl-Substituted N-Heterocyclic Carbenes with a 1,1’-Ferrocenediyl Backbone
(2021-12-14)
1,1’-Diaminoferrocene (1) was converted to α-aminonitriles fc[NHC(CN)MeR’]₂ (fc=1,1’-ferrocenediyl; 2 a: R’=Me, 2 b: R’=Ph, 2 c: R’=tBu) by reaction with ketones MeC(O)R’ in the presence of NaCN/HOAc or to the diimine fc(N=CPh₂)₂ (3) by condensation with Ph₂CO. Treatment of 2 a–c or 3 with MeLi furnished fc(NHR)₂ (4 a: R=tBu, 4 b: R=CMe₂Ph, 4 c: R=CMe₂tBu, 4 d: R=CMePh₂) after aqueous work-up. The formylative cyclisation of 4 a–d to fc[(NR)₂CH][BF₄] (5H[BF₄]) was possible only for R=CMe₃ (a) and CMe₂Ph (b). The ...
Aufsatz
Generation of twisted nanowires with achiral organic amphiphilic copper complexes
(2019-01-14)
Drying under solvent atmosphere (DUSA) was investigated as an experimental technique to generate self-assembled nanowires and needles from solutions of organic molecules under controlled conditions. Experimental observations of twisted nanowires are reported. These twisted nanowires were obtained by drying of solutions of achiral molecules under solvent controlled atmospheres: achiral, amphiphilic copper complexes were dissolved in an achiral solvent and these solutions were dried under controlled conditions. Two ...