cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Reproducing the observed abundances in RCB and HdC stars with post-double degenerate merger models - constraints on merger and post-merger simulations and physics processes
Creators: name: Menon, Athira
name: Herwig, Falk
name: Denissenkov, Pavel A.
name: Clayton, Geoffrey C.
name: Staff, Jan
name: Pignatari, Marco
name: Paxton, Bill
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The R Coronae Borealis (RCB) stars are hydrogen-deficient, variable stars that are most likely the result of He-CO WD mergers. They display extremely low oxygen isotopic ratios, 16O/18O ~ 1 - 10, 12C/13C>=100, and enhancements up to 2.6dex in F and in s-process elements from Zn to La, compared to solar. These abundances provide stringent constraints on the physical processes during and after the double-degenerate merger. As shown before O-isotopic ratios observed in RCB stars cannot result from the dynamic double-degenerate merger phase, and we investigate now the role of the long-term 1D spherical post-merger evolution and nucleosynthesis based on realistic hydrodynamic merger progenitor models. We adopt a model for extra envelope mixing to represent processes driven by rotation originating in the dynamical merger. Comprehensive nucleosynthesis post-processing simulations for these stellar evolution models reproduce, for the first time, the full range of the observed abundances for almost all the elements measured in RCB stars: 16O/18O ratios between 9 and 15, C-isotopic ratios above 100, and ~1.4 - 2.35dex F enhancements, along with enrichments in s-process elements. The nucleosynthesis processes in our models constrain the length and temperature in the dynamic merger shell-of-fire feature as well as the envelope mixing in the post-merger phase. s-process elements originate either in the shell-of-fire merger feature or during the post-merger evolution, but the contribution from the AGB progenitors is negligible. The post-merger envelope mixing must eventually cease ~ 10^6yr after the dynamic merger phase, before the star enters the RCB phase.
description: accepted for publication in ApJ
Coherent Quantum Oscillations in a Silicon Charge Qubit
Creators: name: Shi, Zhan
name: Simmons, C. B.
name: Ward, Daniel. R.
name: Prance, J. R.
name: Mohr, R. T.
name: Koh, Teck Seng
name: Gamble, John King
name: Wu, Xian.
name: Savage, D. E.
name: Lagally, M. G.
name: Friesen, Mark
name: Coppersmith, S. N.
name: Eriksson, M. A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Fast quantum oscillations of a charge qubit in a double quantum dot fabricated in a Si/SiGe heterostructure are demonstrated and characterized experimentally. The measured inhomogeneous dephasing time T2* ranges from 127ps to ~2.1ns; it depends substantially on how the energy difference of the two qubit states varies with external voltages, consistent with a decoherence process that is dominated by detuning noise(charge noise that changes the asymmetry of the qubit's double-well potential). In the regime with the shortest T2*, applying a charge-echo pulse sequence increases the measured inhomogeneous decoherence time from 127ps to 760ps, demonstrating that low-frequency noise processes are an important dephasing mechanism.
description: 5 pages plus 3 page supplemental (8 pages total)
LRRC8 channel activation and reduction in cytosolic chloride concentration during early differentiation of C2C12 myoblasts
Creators: name: Chen, Lingye
name: König, Benjamin
name: Stauber, Tobias
Publisher: name: Freie Universität Berlin
Year: 2020
Subjects: subject: C2C12 myoblasts
subject: Chloride channel
subject: Intracellular chloride
subject: Myogenesis
subject: Volume-regulated anion channel
subject: 500 Naturwissenschaften und Mathematik::570 Biowissenschaften; Biologie::570 Biowissenschaften; Biologie

description: Leucine-rich repeat containing family 8 (LRRC8) proteins form the volume-regulated anion channel (VRAC). Recently, they were shown to be required for normal differentiation and fusion of C2C12 myoblasts, by promoting membrane hyperpolarization and intracellular Ca2+ signals. However, the mechanism by which they are involved remained obscure. Here, using a FRET-based sensor for VRAC activity, we show temporary activation of VRAC within the first 2 h of myogenic differentiation. During this period, we also observed a significant decrease in the intracellular Cl- concentration that was abolished by the VRAC inhibitor carbenoxolone. However, lowering the intracellular Cl(- )concentration by extracellular Cl(- )depletion did not promote differentiation as judged by the percentage of myogenin- positive nuclei or total myogenin levels in C2C12 cells. Instead, it inhibited myosin expression and myotube formation. Together, these data suggest that VRAC is activated and mediates Cl(- )efflux early on during myogenic differentiation, and a moderate intracellular Cl(- )concentration is necessary for myoblast fusion.
Mammut-Fragmente aus dem Kreis Lüchow-Dannenberg
Creators: name: Voelkel, Gerhard
Publisher: name: Nachrichten aus Niedersachsens Urgeschichte
Year: 2019

description: .
description: Nachrichten aus Niedersachsens Urgeschichte, Bd. 37 (1968): Nachrichten aus Niedersachsens Urgeschichte
MOD derived pyrochlore films as buffer layer for all-chemical YBCO coated conductors
Creators: name: Augieri, Andrea
name: Vannozzi, Angelo
name: Mancini, Rita
name: Angrisani, Achille Armenio
name: Fabbri, Fabio
name: Galluzzi, Valentina
name: Rufoloni, Alessandro
name: Rizzo, Francesco
name: Mancini, Antonella
name: Celentano, Giuseppe
name: Colantoni, Ivan
name: Davoli, Ivan
name: Pompeo, Nicola
name: Sotgiu, Giovanni
name: Silva, Enrico
Publisher: name: arXiv
Year: 2012
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report a detailed study performed on La2Zr2O7 (LZO) pyrochlore material grown by Metal-Organic Decomposition (MOD) method as buffer layers for YBa2Cu3O7-x (YBCO) coated conductors. High quality epitaxial LZO thin films have been obtained on single crystal (SC) and Ni-5%at.W substrates. In order to evaluate structural and morphological properties, films have been characterized by means of X-ray diffraction analyses (XRD), atomic force microscope (AFM) and scanning electron microscope (SEM). Precursors solutions and heat treatments have been studied by thermogravimetric analyses (TG-DTA-DTG) and infrared spectra (FT-IR) with the aim of optimizing the annealing process. Thin films of YBCO have been deposited by pulsed laser ablation (PLD) on this buffer layers. The best results obtained on SC showed YBCO films with critical temperature values above 90 K, high self field critical current density values (Jc > 1 MA/cm2) and high irreversibility field values (8.3 T) at 77 K together with a rather high depinning frequency vp (0.5 T, 77 K)>44 GHz as determined at microwaves. The best results on Ni-5%at.W has been obtained introducing in the heat treatment a pyrolysis process at low temperature in air in order to remove the residual organic part of the precursor solution.
Mechanistic reconciliation of community and invasion ecology
Creators: name: Latombe, Guillaume
name: Richardson, David M.
name: McGeoch, Melodie A.
name: Altwegg, Res
name: Catford, Jane A.
name: Chase, Jonathan M.
name: Courchamp, Franck
name: Esler, Karen J.
name: Jeschke, Jonathan M.
name: Landi, Pietro
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: community ecology
subject: hypothesis
subject: invasion ecology
subject: model
subject: process
subject: theory
subject: 500 Naturwissenschaften und Mathematik::570 Biowissenschaften; Biologie::577 Ökologie

description: Community and invasion ecology have mostly grown independently. There is substantial overlap in the processes captured by different models in the two fields, and various frameworks have been developed to reduce this redundancy and synthesize information content. Despite broad recognition that community and invasion ecology are interconnected, a process-based framework synthesizing models across these two fields is lacking. Here we review 65 representative community and invasion models and propose a common framework articulated around six processes (dispersal, drift, abiotic interactions, within-guild interactions, cross-guild interactions, and genetic changes). The framework is designed to synthesize the content of the two fields, provide a general perspective on their development, and enable their comparison. The application of this framework and of a novel method based on network theory reveals some lack of coherence between the two fields, despite some historical similarities. Community ecology models are characterized by combinations of multiple processes, likely reflecting the search for an overarching theory to explain community assembly and structure, drawing predominantly on interaction processes, but also accounting largely for the other processes. In contrast, most models in invasion ecology invoke fewer processes and focus more on interactions between introduced species and their novel biotic and abiotic environment. The historical dominance of interaction processes and their independent developments in the two fields is also reflected in the lower level of coherence for models involving interactions, compared to models involving dispersal, drift, and genetic changes. It appears that community ecology, with a longer history than invasion ecology, has transitioned from the search for single explanations for patterns observed in nature to investigate how processes may interact mechanistically, thereby generating and testing hypotheses. Our framework paves the way for a similar transition in invasion ecology, to better capture the dynamics of multiple alien species introduced in complex communities. Reciprocally, applying insights from invasion to community ecology will help us understand and predict the future of ecological communities in the Anthropocene, in which human activities are weakening species' natural boundaries. Ultimately, the successful integration of the two fields could advance a predictive ecology that is urgently required in a rapidly changing world.
Archäologiepreis Baden-Württemberg 2002 (Hauptpreis) an Dr. Horst Stöckl, Eichstetten a. Kaiserstuhl
Creators: name: Bräuning, Andrea
name: Dehn, Rolf
name: Fingerlin, Gerhard
Publisher: name: Archäologische Nachrichten aus Baden
Year: 2019

description: Archäologische Nachrichten aus Baden, Bd. 68/69 (2004): Archäologische Nachrichten aus Baden
Electron Spin Relaxation Studies of Polydopamine Radicals
Creators: name: Tadyszak, Krzysztof
name: Mrówczyński, Radoslaw
name: Carmieli, Raanan
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: Plastics
subject: Amines
subject: Electron paramagnetic resonance spectroscopy
subject: Quantum mechanics
subject: Polymers
subject: 500 Naturwissenschaften und Mathematik::570 Biowissenschaften; Biologie::570 Biowissenschaften; Biologie

description: We present a thoroughgoing electron paramagnetic resonance investigation of polydopamine (PDA) radicals using multiple electron paramagnetic resonance techniques at the W-band (94 GHz), electron nuclear double resonance at the Q-band (34 GHz), spin relaxation, and continuous wave measurements at the X-band (9 GHz). The analysis proves the existence of two distinct paramagnetic species in the PDA structure. One of the two radical species is characterized by a long spin-lattice T-1 relaxation time equal to 46.9 ms at 5 K and is assigned to the radical center on oxygen. The obtained data revealed that the paramagnetic species exhibit different electron spin relaxation behaviors due to different couplings to local phonons, which confirm spatial distancing between two radical types. Our results shed new light on the radical structure of PDA, which is of great importance in the application of PDA in materials science and biomedicine and allows us to better understand the properties of these materials and predict their future applications.
Karel Sklenáṙ, Archaeology in Central Europe. The First 500 Years
Creators: name: Jacob-Friesen, Gernot
Publisher: name: Bonner Jahrbücher
Year: 2019

description: Rezension zu: Karel Sklenáṙ, Archaeology in Central Europe. The First 500 Years. Leicester University Press (St. Martin’s Press, New York) 1983. 182 Seiten, 26 Abbildungen, 9 Karten
description: Bonner Jahrbücher, Bd. 186.1986: Bonner Jahrbücher
Signalling pathways and mechanistic cues highlighted by transcriptomic analysis of primordial, primary, and secondary ovarian follicles in domestic cat
Creators: name: Kehoe, Shauna
name: Jewgenow, Katarina
name: Johnston, Paul R.
name: Mbedi, Susan
name: Braun, Beate C.
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: Bioinformatics
subject: FOS: Computer and information sciences
subject: Cell biology
subject: Cell signalling
subject: Development
subject: Gene expression
subject: Gene expression analysis
subject: Gene regulation
subject: RNA
subject: 500 Naturwissenschaften und Mathematik::570 Biowissenschaften; Biologie::570 Biowissenschaften; Biologie

description: In vitro growth (IVG) of dormant primordial ovarian follicles aims to produce mature competent oocytes for assisted reproduction. Success is dependent on optimal in vitro conditions complemented with an understanding of oocyte and ovarian follicle development in vivo. Complete IVG has not been achieved in any other mammalian species besides mice. Furthermore, ovarian folliculogenesis remains sparsely understood overall. Here, gene expression patterns were characterised by RNA-sequencing in primordial (PrF), primary (PF), and secondary (SF) ovarian follicles from Felis catus (domestic cat) ovaries. Two major transitions were investigated: PrF-PF and PF-SF. Transcriptional analysis revealed a higher proportion in gene expression changes during the PrF-PF transition. Key influencing factors during this transition included the interaction between the extracellular matrix (ECM) and matrix metalloproteinase (MMPs) along with nuclear components such as, histone HIST1H1T (H1.6). Conserved signalling factors and expression patterns previously described during mammalian ovarian folliculogenesis were observed. Species-specific features during domestic cat ovarian folliculogenesis were also found. The signalling pathway terms "PI3K-Akt", "transforming growth factor-beta receptor", "ErbB", and "HIF-1" from the functional annotation analysis were studied. Some results highlighted mechanistic cues potentially involved in PrF development in the domestic cat. Overall, this study provides an insight into regulatory factors and pathways during preantral ovarian folliculogenesis in domestic cat.
Constraining the Statistics of Population III Binaries
Creators: name: Stacy, Athena
name: Bromm, Volker
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We perform a cosmological simulation in order to model the growth and evolution of Population III (Pop III) stellar systems in a range of host minihalo environments. A Pop III multiple system forms in each of the ten minihaloes, and the overall mass function is top-heavy compared to the currently observed initial mass function in the Milky Way. Using a sink particle to represent each growing protostar, we examine the binary characteristics of the multiple systems, resolving orbits on scales as small as 20 AU. We find a binary fraction of ~36%, with semi-major axes as large as 3000 AU. The distribution of orbital periods is slightly peaked at < 900 yr, while the distribution of mass ratios is relatively flat. Of all sink particles formed within the ten minihaloes, ~50% are lost to mergers with larger sinks, and ~50% of the remaining sinks are ejected from their star-forming disks. The large binary fraction may have important implications for Pop III evolution and nucleosynthesis, as well as the final fate of the first stars.
description: 16 pages, 14 figures, to appear in MNRAS
Andrea Hampel, Die linienbandkeramische Siedlung im Frankfurter Osthafen
Creators: name: Modderman, Pieter Jan Remees
Publisher: name: Bonner Jahrbücher
Year: 2019

description: Rezension zu: Andrea Hampel, Die linienbandkeramische Siedlung im Frankfurter Osthafen. Schriften des Frankfurter Museums für Vor- und Frühgeschichte 7. Verlag Dr. Rudolf Habelt GmbH, Bonn 1984. 281 Seiten, 63 Tafeln, 2 Pläne
description: Bonner Jahrbücher, Bd. 186.1986: Bonner Jahrbücher
Hans Nortmann, Die vorrömische Eisenzeit zwischen unterer Weser und Ems
Creators: name: Keiling, Horst
Publisher: name: Bonner Jahrbücher
Year: 2019

description: Rezension zu: Hans Nortmann, Die vorrömische Eisenzeit zwischen unterer Weser und Ems. Ammerlandstudien 1. Mit einer Einführung von Dieter Zoller. Römisch-Germanische Forschungen 41. Verlag Philipp von Zabern, Mainz 1983. 211 Seiten, 85 Tafeln
description: Bonner Jahrbücher, Bd. 186.1986: Bonner Jahrbücher
Scaling laws for the elastic scattering amplitude
Creators: name: Dremin, I. M.
name: Radovskaya, A. A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The partial differential equation for the imaginary part of the elastic scattering amplitude is derived. It is solved in the black disk limit. The asymptotical scaling behavior of the amplitude coinciding with the geometrical scaling is proved. Its extension to preasymptotical region and modifications of scaling laws for the differential cross section are considered.
description: 6 p. arXiv admin note: substantial text overlap with arXiv:1206.5474
Zinc Phosphate Nanoparticles Produced in Saliva
Creators: name: Saloga, Patrick E. J.
name: Smales, Glen J.
name: Clark, Adam H.
name: Thünemann, Andreas F.
Publisher: name: Freie Universität Berlin
Year: 2020
Subjects: subject: Biomineralization
subject: Nanoparticles
subject: Structure elucidation
subject: Zinc
subject: Artificial digestion
subject: 500 Naturwissenschaften und Mathematik::540 Chemie::540 Chemie und zugeordnete Wissenschaften

description: This paper reports the formation of zinc phosphate nanoparticles from the artificial digestion of zinc chloride. Initially, the formation of amorphous primary particles with a mean radius of 1.1 nm is observed, alongside the formation of larger, protein stabilized aggregates. These aggregates, with a radius of gyration of 37 nm, are observed after 5 minutes of exposure to artificial saliva and are shown to be colloidally stable for a minimum time of two weeks. The initially formed primary particles are thought to consist of amorphous zinc phosphate, which is then transformed into crystalline Zn-3(PO4)(2)center dot 4H(2)O over the course of two weeks. Our results demonstrate that the interaction of inorganic salts with bodily fluids can induce the formation of de novo nanoparticles, which in turn, provides insights into how zinc-enriched foods may also facilitate the formation of nanoparticles upon contact with saliva. As such, this may be considered as an undesirable (bio)mineralization.
Primordial black hole formation from non-Gaussian curvature perturbations
Creators: name: Klimai, P. A.
name: Bugaev, E. V.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We consider several early Universe models that allow for production of large curvature perturbations at small scales. As is well known, such perturbations can lead to formation of primordial black holes (PBHs). We briefly review the today's situation with PBH constraints and then focus on two models in which strongly non-Gaussian curvature perturbations are predicted: the hybrid inflation waterfall model and the curvaton model. We show that PBH constraints on the values of curvature perturbation power spectrum amplitude are strongly dependent on the shape of perturbations and can significantly (by two orders of magnitude) deviate from the usual Gaussian limit ${\cal P}_ζ\lesssim 10^{-2}$. We give examples of PBH mass spectra calculations for both inflationary models.
description: 14 pages, 8 figures. v2: References added, some misprints are corrected. arXiv admin note: substantial text overlap with arXiv:1112.5601
Neuraldecipher - reverse-engineering extended-connectivity fingerprints (ECFPs) to their molecular structures
Creators: name: Le, Tuan
name: Winter, Robin
name: Noé, Frank
name: Clevert, Djork-Arné
Publisher: name: Freie Universität Berlin
Year: 2020
Subjects: subject: chemical-structures
subject: libraries
subject: descriptors
subject: information
subject: generation
subject: index
subject: space
subject: 500 Naturwissenschaften und Mathematik::510 Mathematik::510 Mathematik

description: Protecting molecular structures from disclosure against external parties is of great relevance for industrial and private associations, such as pharmaceutical companies. Within the framework of external collaborations, it is common to exchange datasets by encoding the molecular structures into descriptors. Molecular fingerprints such as the extended-connectivity fingerprints (ECFPs) are frequently used for such an exchange, because they typically perform well on quantitative structure-activity relationship tasks. ECFPs are often considered to be non-invertible due to the way they are computed. In this paper, we present a fast reverse-engineering method to deduce the molecular structure given revealed ECFPs. Our method includes the Neuraldecipher, a neural network model that predicts a compact vector representation of compounds, given ECFPs. We then utilize another pre-trained model to retrieve the molecular structure as SMILES representation. We demonstrate that our method is able to reconstruct molecular structures to some extent, and improves, when ECFPs with larger fingerprint sizes are revealed. For example, given ECFP count vectors of length 4096, we are able to correctly deduce up to 69% of molecular structures on a validation set (112 K unique samples) with our method.
Associations Between Experienced and Internalized HIV Stigma, Adversarial Growth, and Health Outcomes in a Nationwide Sample of People Aging with HIV in Germany
Creators: name: Drewes, Jochen
name: Langer, Phil C.
name: Ebert, Jennifer
name: Kleiber, Dieter
name: Gusy, Burkhard
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: HIV stigma
subject: Posttraumatic growth
subject: Mental health
subject: Self-rated health
subject: Mediation
subject: 100 Philosophie und Psychologie::150 Psychologie::150 Psychologie

description: HIV-related stigmatization and adversarial growth are known to influence health outcomes in people living with HIV. But not much is known how these psychosocial factors are related to each other and how they interact to influence health outcomes. We tested whether the effect of experienced and internalized stigma on mental health and self-rated health is mediated by adversarial growth, and whether each of these factors is uniquely associated with health outcomes. In our sample of 839 people aging with HIV in Germany based on a cross-sectional study design we did not find an indirect effect of experienced HIV stigma on health outcomes and a very small indirect effect of internalized HIV stigma. All variables were significant predictors of health outcomes in multiple regression analyses.
Construction of transmutation operators and hyperbolic pseudoanalytic functions
Creators: name: Kravchenko, Vladislav V.
name: Torba, Sergii M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: Classical Analysis and ODEs (math.CA)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 30B60, 30G20, 34A25, 35A35, 35C10 (primary), 30B10, 34L16, 34A45, 35L10, 41A50, 47N20, 65N99 (secondary)

description: A representation for integral kernels of Delsarte transmutation operators is obtained in the form of a functional series with the exact formulas for the terms of the series. It is based on the application of hyperbolic pseudoanalytic function theory and recent results on mapping properties of the transmutation operators. The kernel $K_1$ of the transmutation operator relating $A=-\frac{d^2}{dx^2}+q_1(x)$ and $B=-\frac{d^2}{dx^2}$ results to be one of the complex components of a bicomplex-valued hyperbolic pseudoanalytic function satisfying a Vekua-type hyperbolic equation of a special form. The other component of the pseudoanalytic function is the kernel of the transmutation operator relating $C=-\frac{d^2}{dx^2}+q_2(x)$ and $B$ where $q_2$ is obtained from $q_1$ by a Darboux transformation. We prove the expansion theorem and a Runge-type theorem for this special hyperbolic Vekua equation and using several known results from hyperbolic pseudoanalytic function theory together with the recently discovered mapping properties of the transmutation operators obtain the new representation for their kernels. Several examples are given. Moreover, based on the presented results approaches for numerical computation of the transmutation kernels and for numerical solution of spectral problems are proposed.
description: 39 pages, 3 figures. New section added, typos corrected
Ursula Höckmann, Die Bronzen aus dem Fürstengrab von Castel San Mariano bei Perugia
Creators: name: Prayon, Friedhelm
Publisher: name: Bonner Jahrbücher
Year: 2019

description: Rezension zu: Ursula Höckmann, Die Bronzen aus dem Fürstengrab von Castel San Mariano bei Perugia. Staatliche Antikensammlungen München. Katalog der Bronzen 1. Verlag C. H. Beck, München 1982. 203 Seiten, 73 Abbildungen, 70 Tafeln und 3 Beilagen
description: Bonner Jahrbücher, Bd. 186.1986: Bonner Jahrbücher
Exact higher-spin symmetry in CFT: all correlators in unbroken Vasiliev theory
Creators: name: Didenko, V. E.
name: Skvortsov, E. D.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: All correlation functions of conserved currents of the CFT that is dual to unbroken Vasiliev theory are found as invariants of higher-spin symmetry in the bulk of AdS. The conformal and higher-spin symmetry of the correlators as well as the conservation of currents are manifest, which also provides a direct link between the Maldacena-Zhiboedov result and higher-spin symmetries. Our method is in the spirit of AdS/CFT, though we never take any boundary limit or compute any bulk integrals. Boundary-to-bulk propagators are shown to exhibit an algebraic structure, living at the boundary of SpH(4), semidirect product of Sp(4) and the Heisenberg group. N-point correlation function is given by a product of N elements.
description: 26 pages, 1 figure; comments and refs added
Vertex Ramsey properties of randomly perturbed graphs
Creators: name: Das, Shagnik
name: Morris, Patrick
name: Treglown, Andrew
Publisher: name: Freie Universität Berlin
Year: 2020
Subjects: subject: Ramsey theory
subject: random graphs
subject: randomly perturbed structures
subject: 500 Naturwissenschaften und Mathematik::510 Mathematik::510 Mathematik

description: Given graphs F, H and G, we say that G is (F, H)(v)-Ramsey if every red/blue vertex coloring of G contains a red copy of F or a blue copy of H. Results of Luczak, Rucinski and Voigt, and Kreuter determine the threshold for the property that the random graph G(n, p) is (F, H)(v)-Ramsey. In this paper we consider the sister problem in the setting ofrandomly perturbed graphs. In particular, we determine how many random edges one needs to add to a dense graph to ensure that with high probability the resulting graph is (F, H)(v)-Ramsey for all pairs (F, H) that involve at least one clique.
Finite domination and Novikov rings. Laurent polynomial rings in two variables
Creators: name: Huettemann, Thomas
name: Quinn, David
Publisher: name: arXiv
Year: 2012
Subjects: subject: K-Theory and Homology (math.KT)
subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: 18G35, 55U15

description: Let C be a bounded cochain complex of finitely generated free modules over the Laurent polynomial ring L = R[x,1/x,y,1/y]. The complex C is called R-finitely dominated if it is homotopy equivalent over R to a bounded complex of finitely generated projective R-modules. Our main result characterises R-finitely dominated complexes in terms of Novikov cohomology: C is R-finitely dominated if and only if eight complexes derived from C are acyclic; these complexes are obtained by tensoring C over L with R[[x,y]][1/xy] and R[x,1/x][[y]][1/y], and their variants obtained by swapping x and y, and replacing either indeterminate by its inverse.
description: 41 pages; v2: minor change to title, typos corrected
Renate Scheiper, Bildpropaganda der römischen Kaiserzeit unter besonderer Berücksichtigung der Trajanssäule in Rom und korrespondierender Münzen
Creators: name: Gauer, Werner
Publisher: name: Bonner Jahrbücher
Year: 2019

description: Rezension zu: Renate Scheiper, Bildpropaganda der römischen Kaiserzeit unter besonderer Berücksichtigung der Trajanssäule in Rom und korrespondierender Münzen. Habelts Dissertationsdrucke, Reihe Klass. Archäologie 15. Dr. Rudolf Habelt GmbH, Bonn 1982. 276 Seiten, 75 Abbildungen
description: Bonner Jahrbücher, Bd. 186.1986: Bonner Jahrbücher
Bernhard Schulte, Die Goldprägung der gallischen Kaiser von Postumus bis Tetricus
Creators: name: Ziegler, Ruprecht
Publisher: name: Bonner Jahrbücher
Year: 2019

description: Rezension zu: Bernhard Schulte, Die Goldprägung der gallischen Kaiser von Postumus bis Tetricus. Typos, Monographien zur antiken Numismatik 4. Verlag Sauerländer, Aarau / Frankfurt a. M. / Salzburg 1983. 189 Seiten, 28 Tafeln
description: Bonner Jahrbücher, Bd. 186.1986: Bonner Jahrbücher
Toward a Transnational Information Ecology on the Right? Hyperlink Networking among Right-Wing Digital News Sites in Europe and the United States
Creators: name: Heft, Annett
name: Knüpfer, Curd
name: Reinhardt, Susanne
name: Mayerhöffer, Eva
Publisher: name: Freie Universität Berlin
Year: 2021
Subjects: subject: right-wing digital news sites
subject: transnational news ecologies
subject: digital media
subject: alternative media
subject: hyperlink networks
subject: transnationalization
subject: 300 Sozialwissenschaften::300 Sozialwissenschaften, Soziologie::300 Sozialwissenschaften

description: The recent rise of a more transnationally networked political right across Europe and the United States has been accompanied by an emerging alternative digital news infrastructure through which information circulates and shared epistemologies are established. This paper examines the extent to which digital news sites on the right are interconnected within and across countries. It further explores which additional sites serve as transnationally shared reference points of such news ecology on a transnational scale. To do so, we investigate hyperlink networks between alternative right-wing online news sites (RNS) in six western democracies (Austria, Germany, United States, United Kingdom, Denmark, Sweden). Our analysis draws on hyperlink data harvested from 65 RNS for three months in 2018. The results show that RNS do establish interlinked alternative right-wing news ecologies, as they connect to likeminded RNS within and across borders. Furthermore, we see substantial variation across countries, where RNS from countries with less established alternative right-wing news infrastructure are more likely to link transnationally to RNS. The United States represents an outlier in that it features the largest and domestically most integrated network of RNS, while U.S. sites function as hubs for transnational connections from European RNS. Apart from connections between RNS, we find that legacy news media are crucial transnationally shared reference points. We conclude that rather than presenting an insulated, alternative sphere, the emerging digital news ecology on the right seeks to link up to the broader information environment across borders.
Magnetic Fields and Star Formation
Creators: name: Van Loo, S.
name: Hartquist, T. W.
name: Falle, S. A. E. G.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Research performed in the 1950s and 1960s by Leon Mestel on the roles of magnetic fields in star formation established the framework within which he and other key figures have conducted subsequent investigations on the subject. This short tribute to Leon contains a brief summary of some, but not all, of his ground breaking contributions in the area. It also mentions of some of the relevant problems that have received attention in the last few years. The coverage is not comprehensive, and the authors have drawn on their own results more and touched more briefly on those of others than they would in a normal review. Theirs is a personal contribution to the issue honouring Leon, one of the truly great gentlemen, wits, and most insightful of astrophysicists.
description: 13 pages, no figures, to be published in Astronomy and Geophysics
Sylvia Klementa, Gelagerte Flußgötter des Späthellenismus und der römischen Kaiserzeit
Creators: name: Vollkommer, Rainer
Publisher: name: Bonner Jahrbücher
Year: 2019

description: Rezension zu: Sylvia Klementa, Gelagerte Flußgötter des Späthellenismus und der römischen Kaiserzeit. Arbeiten zur Archäologie. Böhlau Verlag, Köln/Weimar/Wien 1993, 272 Seiten, 40 Tafeln mit 80 Abbildungen
description: Bonner Jahrbücher, Bd. 197.1997(1999): Bonner Jahrbücher
Cell autonomous requirement of neurofibromin (Nf1) for postnatal muscle hypertrophic growth and metabolic homeostasis
Creators: name: Wei, Xiaoyan
name: Franke, Julia
name: Ost, Mario
name: Wardelmann, Kristina
name: Börno, Stefan
name: Timmermann, Bernd
name: Meierhofer, David
name: Kleinridders, Andre
name: Klaus, Susanne
name: Stricker, Sigmar
Publisher: name: Freie Universität Berlin
Year: 2020
Subjects: subject: Neurofibromatosis
subject: NF1
subject: Myopathy
subject: Muscle atrophy
subject: Muscle metabolism
subject: Muscle fibre type
subject: AMPK
subject: 500 Naturwissenschaften und Mathematik::570 Biowissenschaften; Biologie::570 Biowissenschaften; Biologie

description: Background Neurofibromatosis type 1 (NF1) is a multi-organ disease caused by mutations in neurofibromin 1 (NF1). Amongst other features, NF1 patients frequently show reduced muscle mass and strength, impairing patients' mobility and increasing the risk of fall. The role of Nf1 in muscle and the cause for the NF1-associated myopathy are mostly unknown. Methods To dissect the function of Nf1in muscle, we created muscle-specific knockout mouse models for NF1, inactivatingNf1in the prenatal myogenic lineage either under the Lbx1 promoter or under the Myf5 promoter. Mice were analysed during prenatal and postnatal myogenesis and muscle growth. Results Nf1(Lbx1)and Nf1(Myf5)animals showed only mild defects in prenatal myogenesis. Nf1(Lbx1)animals were perinatally lethal, while Nf1(Myf5)animals survived only up to approximately 25 weeks. A comprehensive phenotypic characterization of Nf1(Myf5)animals showed decreased postnatal growth, reduced muscle size, and fast fibre atrophy. Proteome and transcriptome analyses of muscle tissue indicated decreased protein synthesis and increased proteasomal degradation, and decreased glycolytic and increased oxidative activity in muscle tissue. High-resolution respirometry confirmed enhanced oxidative metabolism in Nf1(Myf5)muscles, which was concomitant to a fibre type shift from type 2B to type 2A and type 1. Moreover, Nf1(Myf5)muscles showed hallmarks of decreased activation of mTORC1 and increased expression of atrogenes. Remarkably, loss of Nf1 promoted a robust activation of AMPK with a gene expression profile indicative of increased fatty acid catabolism. Additionally, we observed a strong induction of genes encoding catabolic cytokines in muscle Nf1(Myf5)animals, in line with a drastic reduction of white, but not brown adipose tissue. Conclusions Our results demonstrate a cell autonomous role for Nf1 in myogenic cells during postnatal muscle growth required for metabolic and proteostatic homeostasis. Furthermore, Nf1 deficiency in muscle drives cross-tissue communication and mobilization of lipid reserves.
Mechanism of collisionless sound damping in dilute Bose gas with condensate
Creators: name: Slyusarenko, Yu.
name: Kruchkov, A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences
subject: 82-02

description: We develop a microscopic theory of sound damping due to Landau mechanism in dilute gas with Bose condensate. It is based on the coupled evolution equations of the parameters describing the system. These equations have been derived in earlier works within a microscopic approach which employs the Peletminskii-Yatsenko reduced description method for quantum many-particle systems and Bogoliubov model for a weakly nonideal Bose gas with a separated condensate. The dispersion equations for sound oscillations were obtained by linearization of the mentioned evolution equations in the collisionless approximation. They were analyzed both analytically and numerically. The expressions for sound speed and decrement rate were obtained in high and low temperature limiting cases. We have shown that at low temperature the dependence of the obtained quantities on temperature significantly differs from those obtained by other authors in the semi-phenomenological approaches. Possible effects connected with non-analytic temperature dependence of dispersion characteristics of the system were also indicated.
description: 17 pages, 7 figures
Yvez Menez, Une ferme de l’Armorique gauloise. Le Boisanne à Plouër-sur-Rance (Côtes-d’Armor)
Creators: name: Haaleboos, Jan Kees
Publisher: name: Bonner Jahrbücher
Year: 2019

description: Rezension zu: Yvez Menez, Une ferme de l’Armorique gauloise. Le Boisanne à Plouër-sur-Rance (Côtes-d’Armor). Documents d’Archéologie Française, Band 58. Éditions de la Maison des Sciences de l’Homme, Paris 1996. 267 Seiten, 34 Tafeln und 173 Abbildungen
description: Bonner Jahrbücher, Bd. 198.1998(2001): Bonner Jahrbücher
Targeting and Inhibiting Plasmodium falciparum Using Ultra-small Gold Nanoparticles
Creators: name: Varela-Aramburu, Silvia
name: Ghosh, Chandradhish
name: Goerdeler, Felix
name: Priegue, Patricia
name: Moscovitz, Oren
name: Seeberger, Peter H.
Publisher: name: Freie Universität Berlin
Year: 2020
Subjects: subject: gold nanoparticles
subject: Plasmodium falciparum
subject: targeting
subject: ciprofloxacin
subject: inhibition
subject: 500 Naturwissenschaften und Mathematik::570 Biowissenschaften; Biologie::570 Biowissenschaften; Biologie

description: Malaria, a mosquito-borne disease caused by Plasmodium species, claims more than 400,000 lives globally each year. The increasing drug resistance of the parasite renders the development of new anti-malaria drugs necessary. Alternatively, better delivery systems for already marketed drugs could help to solve the resistance problem. Herein, we report glucose-based ultra-small gold nanoparticles (Glc-NCs) that bind to cysteine-rich domains of Plasmodium falciparum surface proteins. Microscopy shows that Glc-NCs bind specifically to extracellular and all intra-erythrocytic stages of P. falciparum. Glc-NCs may be used as drug delivery agents as illustrated for ciprofloxacin, a poorly soluble antibiotic with low antimalarial activity. Ciprofloxacin conjugated to Glc-NCs is more water-soluble than the free drug and is more potent. Glyco-gold nanoparticles that target cysteine-rich domains on parasites may be helpful for the prevention and treatment of malaria.
Cosmic Neutrino Flavor Ratios with Broken $ν_μ-ν_τ$ Symmetry
Creators: name: Fu, Lingjun
name: Ho, Chiu Man
name: Weiler, Thomas J.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Reactor neutrino experiments have now observed a nonzero value for $θ_{13}$ at $5σ$, and global fits to data imply a nonzero value above $10σ$. Nonzero values for $θ_{13}$ and/or $θ_{32}-π/4$ break a $ν_μ-ν_τ$ symmetry, which has qualitative as well as quantitative implications for the time-evolution of neutrino flavors. In particular, the large-distance flavor evolution matrix, non-invertible with $ν_μ-ν_τ$ symmetry, is now invertible. This means that measurements of neutrino flavor ratios at Earth can now be inverted to directly reveal the flavor ratios injected at cosmically distant sources. With the updated values of the three neutrino mixing angles, we obtain the inverted large-distance evolution matrix and use it to derive several phenomenological relations between the injection flavor ratios and the observable ratios at Earth. Taking the three popular injection models as examples, we also exhibit the shift of Earthly observed flavor ratios from the corresponding values in the case with $ν_μ-ν_τ$ symmetry.
description: 8 pages, 1 figure, v2: version to appear in PLB
7 Tesla MRI Followed by Histological 3D Reconstructions in Whole-Brain Specimens
Creators: name: Alkemade, Anneke
name: Pine, Kerrin
name: Kirilina, Evgeniya
name: Keuken, Max C.
name: Mulder, Martijn J.
name: Balesar, Rawien
name: Groot, Josephine M.
name: Bleys, Ronald L. A. W.
name: Trampel, Robert
name: Weiskopf, Nikolaus
Publisher: name: Freie Universität Berlin
Year: 2020
Subjects: subject: post mortem human brain
subject: ultra-high field MRI
subject: whole brain imaging
subject: histology
subject: formalin fixation
subject: 100 Philosophie und Psychologie::150 Psychologie::150 Psychologie

description: Post mortem magnetic resonance imaging (MRI) studies on the human brain are of great interest for the validation of in vivo MRI. It facilitates a link between functional and anatomical information available from MRI in vivo and neuroanatomical knowledge available from histology/immunocytochemistry. However, linking in vivo and post mortem MRI to microscopy techniques poses substantial challenges. Fixation artifacts and tissue deformation of extracted brains, as well as co registration of 2D histology to 3D MRI volumes complicate direct comparison between modalities. Moreover, post mortem brain tissue does not have the same physical properties as in vivo tissue, and therefore MRI approaches need to be adjusted accordingly. Here, we present a pipeline in which whole-brain human post mortem in situ MRI is combined with subsequent tissue processing of the whole human brain, providing a 3-dimensional reconstruction via blockface imaging. To this end, we adapted tissue processing procedures to allow both post mortem MRI and subsequent histological and immunocytochemical processing. For MRI, tissue was packed in a susceptibility matched solution, tailored to fit the dimensions of the MRI coil. Additionally, MRI sequence parameters were adjusted to accommodate T1 and T2∗ shortening, and scan time was extended, thereby benefiting the signal-to-noise-ratio that can be achieved using extensive averaging without motion artifacts. After MRI, the brain was extracted from the skull and subsequently cut while performing optimized blockface imaging, thereby allowing three-dimensional reconstructions. Tissues were processed for Nissl and silver staining, and co-registered with the blockface images. The combination of these techniques allows direct comparisons across modalities.
Pierre Garmy und Louis Maurin (Hrsg.), Enceintes romaines d’Aquitaine. Bordeaux, Dax, Périgueux, Bazas
Creators: name: Haaleboos, Jan Kees
Publisher: name: Bonner Jahrbücher
Year: 2019

description: Rezension zu: Pierre Garmy und Louis Maurin (Hrsg.), Enceintes romaines d’Aquitaine. Bordeaux, Dax, Périgueux, Bazas. Documents d’Archéologie Française, Band 53. Éditions de la Maison des Sciences de l’Homme, Paris 1996. 197 Seiten, 124 Abbildungen
description: Bonner Jahrbücher, Bd. 198.1998(2001): Bonner Jahrbücher
Friedrich-Wilhelm Wulf, Archäologische Denkmale in der kreisfreien Stadt Wilhelmshaven
Creators: name: Stilke, Henning
Publisher: name: Bonner Jahrbücher
Year: 2019

description: Rezension zu: Friedrich-Wilhelm Wulf, Archäologische Denkmale in der kreisfreien Stadt Wilhelmshaven. Materialhefte zur Ur- und Frühgeschichte Niedersachsens, Reihe B Inventare, Heft 1. Mit Beiträgen von
K.-E. Behre und W. H. Zimmermann. Verlag Hahnsche Buchhandlung, Hannover 1996. 197 Seiten, 29 Abbildungen, 22 Tafeln, 1 Faltkarte
description: Bonner Jahrbücher, Bd. 198.1998(2001): Bonner Jahrbücher
The QUIET Instrument
Creators: name: QUIET Collaboration
name: Bischoff, C.
name: Brizius, A.
name: Buder, I.
name: Chinone, Y.
name: Cleary, K.
name: Dumoulin, R. N.
name: Kusaka, A.
name: Monsalve, R.
name: Naess, S. K.
name: Newburgh, L. B.
name: Nixon, G.
name: Reeves, R.
name: Smith, K. M.
name: Vanderlinde, K.
name: Wehus, I. K.
name: Bogdan, M.
name: Bustos, R.
name: Church, S. E.
name: Davis, R.
name: Dickinson, C.
name: Eriksen, H. K.
name: Gaier, T.
name: Gundersen, J. O.
name: Hasegawa, M.
name: Hazumi, M.
name: Holler, C.
name: Huffenberger, K. M.
name: Imbriale, W. A.
name: Ishidoshiro, K.
name: Jones, M. E.
name: Kangaslahti, P.
name: Kapner, D. J.
name: Lawrence, C. R.
name: Leitch, E. M.
name: Limon, M.
name: McMahon, J. J.
name: Miller, A. D.
name: Nagai, M.
name: Nguyen, H.
name: Pearson, T. J.
name: Piccirillo, L.
name: Radford, S. J. E.
name: Readhead, A. C. S.
name: Richards, J. L.
name: Samtleben, D.
name: Seiffert, M.
name: Shepherd, M. C.
name: Staggs, S. T.
name: Tajima, O.
name: Thompson, K. L.
name: Williamson, R.
name: Winstein, B.
name: Wollack, E. J.
name: Zwart, J. T. L.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The Q/U Imaging ExperimenT (QUIET) is designed to measure polarization in the Cosmic Microwave Background, targeting the imprint of inflationary gravitational waves at large angular scales (~ 1 degree). Between 2008 October and 2010 December, two independent receiver arrays were deployed sequentially on a 1.4 m side-fed Dragonian telescope. The polarimeters which form the focal planes use a highly compact design based on High Electron Mobility Transistors (HEMTs) that provides simultaneous measurements of the Stokes parameters Q, U, and I in a single module. The 17-element Q-band polarimeter array, with a central frequency of 43.1 GHz, has the best sensitivity (69 uK sqrt(s)) and the lowest instrumental systematic errors ever achieved in this band, contributing to the tensor-to-scalar ratio at r < 0.1. The 84-element W-band polarimeter array has a sensitivity of 87 uK sqrt(s) at a central frequency of 94.5 GHz. It has the lowest systematic errors to date, contributing at r < 0.01. The two arrays together cover multipoles in the range l= 25-975. These are the largest HEMT-based arrays deployed to date. This article describes the design, calibration, performance of, and sources of systematic error for the instrument.
Fritz Mangartz, Die antiken Steinbrüche der Hohen Buche bei Andernach. Topographie, Technologie und Chronologie
Creators: name: Müller, Harald W.
Publisher: name: Bonner Jahrbücher
Year: 2019

description: Rezension zu: Fritz Mangartz, Die antiken Steinbrüche der Hohen Buche bei Andernach. Topographie, Technologie und Chronologie. Vulkanpark-Forschungen. Untersuchungen zur Landschafts- und Kulturgeschichte, Band 1. Verlag des Römisch-Germanischen Zentralmuseums, Mainz 1998. 119 Seiten, 53 Tafeln mit Zeichnungen und Photos, 8 Farbtafeln und 3 Kartenbeilagen
description: Bonner Jahrbücher, Bd. 199.1999(2002): Bonner Jahrbücher