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Seed inoculation of Hartmannibacter diazotrophicus does not alter the rhizosphere bacterial microbiome of wheat and barley in a three-year field trial
(2025) Quiroga, Santiago; Ratering, Stefan; Rosado-Porto, David; Rekowski, Azin; Schulz, Franz; Zörb, Christian; Schnell, Sylvia
The effects of plant growth promoting bacteria used for inoculation on native microorganisms remain unexplored under field conditions and, to a lesser extent, in longitudinal studies using different crops. This study, spanning three seasons across two organic fields, examined through 16S rRNA gene sequencing how the seed inoculation of Hartmannibacter diazotrophicus influenced the rhizosphere bacterial communities of wheat and barley. In addition to bacterial inoculation, the effects of row spacing and organic fertilizer application were also assessed. Together with previous results, we determined that H. diazotrophicus could improve crop yield parameters without altering the bacterial community composition. Alpha and beta diversity indices showed non-significant effects for most of the three factors evaluated. The 19 most prevalent taxa at the genus level were identified in both crop species, which mainly encompassed the phyla Pseudomonadota, Acidobacteriota, and Actinomycetota. Differential abundance analysis showed that the location significantly influenced the recruitment of different bacterial communities by the same crop species. While in one organic farm, 2860 ASVs were affected by crop species, 232 ASVs were impacted at the other location. Further analyses, including longitudinal analysis, linear mixed model effects, and diversity indices, showed a significant effect of location, crop species, and season on the dynamics of bacterial communities. Our results are unusual compared with most of the studies reported and indicate the resilience of rhizosphere bacterial populations after the incorporation of an allochthonous microorganism such as H. diazotrophicus.
On the largest independent sets in the Kneser graph on chambers of PG(4,q)
(2025) Heering, Philipp
Let Γ4be the graph whose vertices are the chambers of the finite projective 4-space PG(4,q), with two vertices being adjacent if the corresponding chambers are in general position. For q≥749we show that (q2+q+1)(q3+2q2+q+1)(q+1)2is the independence number of Γ4and the geometric structure of the largest independent sets is described.
Das individuelle Beratungsportfolio: Eine Möglichkeit zur Dokumentation, Analyse, Reflexion und Kom-munikation von Beratungskompetenz
(2026-07-06) Krebs, Niklas
Diese wissenschaftliche Handreichung richtet sich an alle Forschenden, Lehrenden und Verwaltenden, denen im Rahmen ihrer Tätigkeiten Beratungsaufgaben zukommen und sie diese einmal professionell dokumentieren, analysieren, reflektieren und adressatengerecht kommunizieren möchten. In ihr wird ausführlich dargelegt, aus welchen Kontexten sich das individuelle Beratungsportfolio zur Dokumentation, Analyse, Reflexion und Kommunikation von Beratungskompetenz heraus entwickelt hat, wie es sich definieren lässt und wie es aufgebaut ist, aus welchen Komponenten es sich zusammensetzt und wie diese sich individuell ausformulieren lassen, welche individuellen Ziele man selbst mit ihm verfolgen und wo es überall zur Anwendung kommen kann. Im Anhang befindet sich überdies ein tabellarischer Leitfaden, an welchen man sich bei der Erstellung und Ausformulierung des eigenen individuellen Beratungsportfolios orientieren kann.
The spatial dimension of innovation and socio-technical change: insights from economic geography
(2026) Losacker, Sebastian
This habilitation thesis explores the spatial dimension of innovation and socio-technical change. While innovation is a key driver of economic development and socio-technical transformation, its geographical embeddedness remains insufficiently understood. The thesis addresses this gap by examining the origins, situatedness, and implications of innovation processes, with particular attention to the bioeconomy and the twin transition – domains of high political and societal relevance. The thesis is a cumulative one, combining 21 published articles. The theoretical foundation of this thesis draws on (and contributes to) three main strands of scholarship: First, literature on the geography of innovation, including frameworks for analyzing national, regional, technological, and global innovation systems, alongside debates on mission- and challenge-oriented policy. Second, evolutionary economic geography, including theoretical approaches to understanding specialization, diversification, relatedness, and complexity, which help explain why regional development pathways are often path-dependent and uneven. Third, transition studies, including perspectives on socio-technical systems and imaginaries, highlighting how institutional and cultural elements stabilize or transform existing systems and how visions of the future influence their directionality. Together, these strands inform an integrative perspective on the spatiality of innovation and socio-technical change. Methodologically, the thesis employs a mixed-methods design. Quantitative analyses use patent data to trace the emergence, diffusion, and geography of innovation activities, complemented by novel datasets and indicators such as machine-learning-based classifications of patent texts, large-scale web-mining of firms and municipalities, and a geolocated corpus of German news articles. Sequence analysis is introduced as a methodological innovation, enabling the study of region-specific temporal trajectories. In addition, qualitative studies provide conceptual and inductive insights into socio-technical imaginaries, legitimacy struggles, and actor constellations. The cumulative work shows that innovation and socio-technical change are spatially uneven, shaped by regional preconditions, multi-scalar linkages, and technology-specific features. It demonstrates the value of combining quantitative and qualitative approaches to capture both systematic evidence and contested, imaginative dimensions. Overall, the thesis contributes to geographically informed understandings of sustainability transitions and to debates on policies fostering inclusive, place-sensitive pathways of change.
Investigating Quasiparticle Interactions in the Far-Infrared
(2026) Anders, Daniel
This dissertation investigates ultrafast charge-carrier dynamics and quasiparticle interactions in semiconductors using terahertz (THz) spectroscopy. The THz spectral range provides direct access to low-energy excitations such as intraexcitonic transitions and free-carrier dynamics, making it a powerful probe of many-body interactions in photoexcited semiconductor systems. Using optical pump–terahertz probe spectroscopy and broadband THz emission measurements, several aspects of carrier dynamics in bulk and low-dimensional semiconductors are explored. First, broadband and gapless THz radiation is generated in bulk germanium via phase-controlled quantum interference currents driven by two-color optical excitation. This approach enables efficient emission across the entire THz spectral range and provides insight into the underlying photocurrent generation mechanisms. The dissertation further investigates the formation dynamics of excitons in (Ga,In)As multi-quantum wells following nonresonant optical excitation. Time-resolved THz spectroscopy reveals that excitons emerge from an initially created electron–hole plasma on two distinct timescales: a fast component of approximately 10 ps and a slower component of about 250 ps. By introducing a differential probing method based on weak and strong THz fields, the longstanding discrepancy in reported exciton formation times is resolved. In addition, the interaction of incoherent excitons with an additional electron–hole plasma is studied using a double optical pump–THz probe scheme. The results show that elastic and inelastic scattering processes are governed primarily by the excess energy of the additional carriers rather than their density. Despite excitation energies exceeding the exciton binding energy, inelastic scattering occurs only when suitable final states are available, consistent with predictions from Fermi’s golden rule. The screening of excitonic states by additional charge carriers is investigated by monitoring the transient shift of the intraexcitonic 1s–2p transition. The measurements provide direct access to the time-dependent exciton binding energy and reveal that the screening strength scales linearly with carrier density while the screening time is determined by the carrier excess energy. Finally, transient excitonic states induced by intense optical fields are demonstrated. Detuned optical excitation produces short-lived excitonic resonances that exist only during the temporal overlap of pump and probe pulses and manifest as blue-shifted THz absorption features. Together, these results provide new insight into ultrafast exciton formation, many-body interactions, and THz generation mechanisms in semiconductor systems, highlighting the capabilities of terahertz spectroscopy as a powerful tool for probing quasiparticle dynamics in condensed matter.