A5022523507- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Insect and Arachnid Ecology and Behavior
- Nuclear physics research studies
- Insect and Pesticide Research
- Insect Utilization and Effects
- Advanced NMR Techniques and Applications
- Plant and animal studies
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Evolution and Genetic Dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Atomic and Molecular Physics
- Digital Innovation in Industries
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Evolutionary Game Theory and Cooperation
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Crystallography and Radiation Phenomena
- Tardigrade Biology and Ecology
- Protist diversity and phylogeny
- Scientific Research and Discoveries
- Physics of Superconductivity and Magnetism
University of Freiburg
2016-2025
Institut de Biologia Evolutiva
2024
University of Bonn
2014-2023
University of Groningen
2022
Arvato
2017
Bowral & District Hospital
2017
Eastern Health
2017
Deutsches Archäologisches Institut, Zentrale
2016
Johannes Gutenberg University Mainz
2001-2013
Austin Hospital
2010
The photoproduction of $\ensuremath{\omega}$ mesons on nuclei has been investigated using the Crystal Barrel/TAPS experiment at ELSA tagged photon facility in Bonn. aim is to study possible in-medium modifications meson via reaction $\ensuremath{\gamma}+A\ensuremath{\rightarrow}\ensuremath{\omega}+X\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}\ensuremath{\gamma}+{X}^{\ensuremath{'}}$. Results obtained for Nb are compared a reference measurement ${\mathrm{LH}}_{2}$ target. While recoiling,...
Variation in gene expression leads to phenotypic diversity and plays a central role caste differentiation of eusocial insect species. In social Hymenoptera, females with the same genetic background can develop into queens or workers, which are characterized by divergent morphologies, behaviours lifespan. Moreover, many insects exhibit behaviourally distinct worker castes, such as brood-tenders foragers. Researchers have just started explore genes differentially expressed achieve this...
Significance Social insects such as honey bees or termites are promising new models for aging research. In contrast to short-lived like the fruit fly mouse, reproductives of an insect colony have exceptionally long lifespans. This offers important avenues gerontology, especially mechanisms underlying highly conserved among animals. We studied in a termite from wild. Our results suggest that this species, other animals, is related activity transposable elements (TEs; also known “jumping...
The exceptional longevity of social insect queens despite their lifelong high fecundity remains poorly understood in ageing biology. To gain insights into the mechanisms that might underlie insects, we compared gene expression patterns between young and old castes (both workers) across different lineages insects (two termite, two bee ant species). After global analyses, paid particular attention to genes insulin/insulin-like growth factor 1 signalling (IIS)/target rapamycin (TOR)/juvenile...
Total and differential cross sections for η η′photoproduction off the proton have been determined with CBELSA/TAPS detector photon energies between 0.85 2.55 GeV. The mesons are detected in their two neutral decay modes, η→γγ η→3π0→6γ, first time, cover full angular range cosθc.m. of meson. These new photoproduction data consistent earlier CB-ELSA results. η′ observed to π0π0η→6γ also extend coverage range.8 MoreReceived 8 September 2009DOI:https://doi.org/10.1103/PhysRevC.80.055202©2009...
Information on hadron properties in the nuclear medium has been derived from photoproduction of $\ensuremath{\omega}$ mesons nuclei C, Ca, Nb, and Pb using Crystal Barrel/TAPS detector at ELSA tagged photon facility Bonn. The dependence $\ensuremath{\omega}$-meson cross section mass number compared with three different types models: a Glauber analysis, Boltzmann-Uehling-Uhlenbeck analysis Giessen theory group, calculation by Valencia group. In all cases, inelastic width is found to be...
Quasifree photoproduction of eta mesons off nucleons bound in the deuteron has been measured with CBELSA/TAPS detector for incident photon energies up to 2.5 GeV at Bonn ELSA accelerator. The have detected coincidence recoil protons and neutrons, which allows a detailed comparison quasifree n(gamma,eta)n p(gamma,eta)p reactions. excitation function production neutron shows pronounced bumplike structure W=1.68 (E{gamma} approximately 1 GeV), is absent proton.
The photoproduction of \eta'-mesons off different nuclei has been measured with the CBELSA/TAPS detector system for incident photon energies between 1500 - 2200 MeV. transparency ratio deduced and compared to theoretical calculations describing propagation in nuclei. comparison indicates a width \eta' -meson order \Gamma= 15-25 MeV at \rho =\rho_0 an average momentum p_{\eta'} = 1050 MeV/c, which \eta'-meson is produced nuclear rest frame. inelastic N cross section estimated be 3 10 mb....
The γ+p→K0+Σ+ photoproduction reaction is investigated in the energy region from threshold to Eγ=2250 MeV. differential cross section exhibits increasing forward-peaking with energy, but only up K⁎ threshold. Beyond, it suddenly returns a flat distribution forward dropping by factor of four. In total pronounced structure observed between K⁎Λ and K⁎Σ thresholds.
The first measurement is reported of the double-polarization observable G in photoproduction neutral pions off protons, covering photon energy range from 620 to 1120 MeV and full solid angle. describes correlation between polarization plane scattering for protons polarized along direction incoming photon. highly sensitive contributions baryon resonances. new results are compared predictions SAID, MAID, BnGa partial wave analyses. In spite long-lasting efforts understand γp→pπ0 as simplest...
The first measurement of the helicity dependence photoproduction cross section single neutral pions off protons is reported for photon energies from 600 to 2300 MeV, covering nearly full solid angle. data are compared predictions SAID, MAID, and BnGa partial wave analyses. Strikingly large differences between observed, which traced in amplitudes well-known established resonances. Precise values several resonances reported.
Abstract Social insect castes (e.g., queens, workers) are prime examples of phenotypic plasticity (i.e., different phenotypes arising from the same genotype). Yet, mechanisms that give rise to highly fertile, long-lived queens versus non-reproducing, short-lived workers not well understood. Recently, a module co-expressed genes has been identified characterizes compared termite Cryptotermes secundus (Kalotermitidae): Queen Central Module (QCM). We tested whether QCM is shared in species,...
Meiotic recombination is a fundamental evolutionary process that facilitates adaptation and the removal of deleterious genetic variation. Social Hymenoptera exhibit some highest rates among metazoans, whereas high have not been found nonsocial species from this insect order. It unknown whether elevated are ubiquitous feature all social insects. In many metazoan taxa, mainly restricted to hotspots few kilobases in length. However, little known about prevalence genomes. Here we infer rate its...
The recoil proton polarization has been measured in the p(e-->,e'p-->)pi(0) reaction parallel kinematics around W = 1232 MeV, Q2 0.121 (GeV/c)2, and epsilon 0.718 using polarized cw electron beam of Mainz Microtron. All three components, Px/P(e) (-11.4+/-1.3+/-1.4)%, P(y) (-43.1+/-1.3+/-2.2)%, P(z)/P(e) (56.2+/-1.5+/-2.6)%, could be simultaneously. Coulomb quadrupole to magnetic dipole ratio, CMR (-6.4+/-0.7(stat)+/-0.8(syst))%, was determined from Px framework Unitary Isobar Model....
The differential cross sections and unpolarized spin-density matrix elements for the reaction γp→pω were measured using CBELSA/TAPS experiment initial photon energies ranging from threshold to 2.5 GeV. These observables radiative decay of ω meson, ω→π0γ. cover full angular range show extent t-channel forward rise. overall shape distributions in are fair agreement with previous data. In addition, first time, a beam linearly-polarized tagged photons energy 1150 MeV 1650 was used extract...