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Aufsatz
Optimization of the bicinchoninic acid assay for quantifying carbohydrates of soil extracellular polymeric substances
(2023-12-23)
Background and aims
The bicinchoninic acid (BCA) method was not yet applied on soil extracts of extracellular polymeric substances (EPS) to quantify polysaccharides, although this might be possible by introducing a cleavage step to produce monosaccharides. A pre-extraction with CaCl₂ to remove interfering substances is usually performed before extracting EPS. The main objective of this study was to optimize the BCA assay for total carbohydrates quantification by applying a hydrolysis step to the EPS extracts, while ...
Aufsatz
The chronos of class conflict. The relevance of the temporal dimension in conflicts related to labour migration
(2023-10-13)
In recent migration research temporality has become a prominent figure. Focussing on temporality allows to shed light on some aspects of labour mobility that enlighten our understanding of work-related conflicts. Especially with view to labour market inclusion, migrants often experience the (assumed) temporal limitation and unpredictability of migration projects, work and residence permits, as well as employment relationships. Correspondingly, labour policies, sector-specific company structures and management techniques ...
Aufsatz
At the limits of bisphosphonio-substituted stannylenes
(2023-12-13)
Donor stabilization of Sn(II) and Pb(II) halides with 1,1’-ferrocenylene bridged bisphosphanes has been explored for Fe(C₅H₄P(C6H₅)₂)₂ (dppf), and Fe(C₅H₄PH(C₄H9))₂. These bisphosphanes are reacted with SnBr₂ and PbCl₂ with and without additional Lewis acid (AlCl₃) forming acyclic and cyclic donor adducts from which the latter represent bisphosphoniotetrylenes. Since dynamic exchange in solution is observed, characterization includes solution and solid-state NMR in addition to SC-XRD, amended by DFT calculations.
Aufsatz
Vibrationally Resolved Absorption and Fluorescence Cross Sections of Adamantane in the Far-ultraviolet Spectral Range on an Absolute Scale
(2023-07-20)
High-resolution absorption, dispersed fluorescence emission, and photoionization cross sections are presented for gas-phase adamantane excited by synchrotron radiation in the exciting-photon energy range of 6–30 eV. Relative and absolute absorption cross sections of so-far unmatched resolution of down to 0.27 cm−¹ line width in the region from 6.4–28 eV are shown along with newly discovered vibronic substructures around the HOMO–LUMO transition. Absorption line positions are provided with very high accuracy and listed ...
Aufsatz
Analyzing the implications of organic standardization and certification in alternative food networks: The capability approach
(2023-06-14)
Although organic standards and certification schemes have a crucial role in ensuring quality, safety, and sustainability within food systems, there is a need to critically analyze their implications on human capabilities within alternative food networks (AFNs). Therefore, this paper draws upon the capability approach to analyze the implications of three governance mechanisms (i.e., third-party, social control, and hybrid certification) on human flourishing within AFNs in Ceará, Brazil. The three cases primarily build ...
Aufsatz
Depression, Race-Based Bias, and Judgements of Veracity
(2023-07-26)
The depressive realism hypothesis suggests that depressed individuals have a more realistic perception than nondepressed. Most studies depict the effects of depressive realism on self-perceptions. However, some lie detection studies suggest the effects of depressive realism on the perception of others. Our study investigated the hypothesis that individuals with subclinical depression levels (dysphoric) show a heightened accuracy in lie detection and a lower truth bias. Furthermore, we expected these effects to be ...
Aufsatz
Design to manufacture of fully stressed curved structures through elastic deformation of thin steel sheets with interlocking connections
(2023-09-12)
The research project presents the development of a fully digital design to manufacture process chain for high-performance curved steel elements produced by laser cutting thin steel sheets and assembled through elastic deformation. Although there have been developments in industrial robotic setups to automate steel beam bending, these processes rely on an iterative approach and are time-consuming and costly when there is a need for high accuracy.
The paper shows how the production of tailor-made geometric parts ...
Aufsatz
Potentials of reusing steel skeleton structures from multistorey parking units for architectural applications
(2023-09-12)
In the context of urban mining, which aims to extend the value chain of building components to conserve resources, save energy, avoid waste, and reduce emissions, the reuse of structural steel has great potential, that has hardly been exploited to date.
In Germany, a significant amount of steel is found within multistorey parking units. Due to the standardised and mass relevant steel used in these structures and considering their diminishing significance in the context of transportation transitions, these buildings ...
Aufsatz
Yield stability of silage maize double cropping systems across nine German environments
(2023-10-19)
Introduction: Yield and its stability are both vital characteristics to evaluate the viability of cropping systems. However, the current frames of field research hardly allow an accurate evaluation of short-term effect stability. Therefore, over nine German environments (three years and three locations), first crop, maize, total harvested dry biomass yield (DMY), and maize dry matter content (DMC) variability were evaluated through a risk assessment in an organically managed silage maize experiment comprising 18 ...
Aufsatz
Can carbon payments improve profitability of traditional conventional and organic cocoa agroforests? A case study in the Eastern Region of Ghana
(2023-03-16)
This study investigates the carbon (C) sequestration of traditional cocoa agroforestry systems in the Eastern Region of Ghana and the theoretical impact of CO₂ emission rights trading on their profitability. The study was conducted in four villages of Suhum Municipality, two each with either conventional or organic cocoa cultivation systems. Profitability was calculated using net present value of net cashflow (NPV), benefit cost ratio (BCR), and modified internal rate of return (MIRR). Carbon revenues were calculated ...