cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Cuticular Hydrocarbons as Contact Sex Pheromone in the Parasitoid Wasp Urolepis rufipes
Creators: name: Ruther, Joachim
name: Würf, Josef
name: Pokorny, Tamara
name: Wittbrodt, Johannes
name: Millar, Jocelyn G.
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: cuticular hydrocarbons, mate finding, parasitoid wasp, contact sex pheromone, Urolepis rufipes
subject: 590 Tiere (Zoologie)

description: The cuticle of virtually any insect is covered by a thin layer of cuticular hydrocarbons (CHCs) typically consisting of a complex mixture of n-alkanes, methyl-branched alkanes, and unsaturated hydrocarbons. Apart from their putative primary function as a desiccation barrier, CHCs are used by insects for communication. In many species of parasitoid wasps, males use CHCs to recognize females, and thus the composition of CHC profiles is typically species- and sex-specific. Sometimes, the biological activity of CHCs is synergized by more polar lipids. In most species, however, the contribution of polar lipids and the role of individual CHCs or CHC classes is unclear. Here we report a CHC-based contact sex pheromone in the pteromalid wasp Urolepis rufipes. Males of U. rufipes were arrested on and showed courtship behavior (wing fanning) and copulation attempts toward cadavers of females, whereas male cadavers and solvent-washed cadavers of either sex elicited no responses. Whole body extracts from females and the non-polar CHC fraction thereof elicited arrestment, courtship, and copulation attempts by males, whereas the fractions containing polar lipids were behaviorally inactive. Analyses of male- and female-derived CHC profiles revealed that they consisted exclusively of n-alkanes and methyl-branched alkanes. Removal of n-alkanes from female-derived CHCs with molecular sieves rendered the remaining methyl-branched fraction inactive. Synthetic n-alkanes in female-specific ratios also did not elicit any responses by males. Two 7-methylalkanes (7-MeC31 and 7-MeC33) were the only two components with a higher relative abundance in females compared to males. However, supplementation of male-derived CHCs with synthetic racemic 7-MeC31 and 7-MeC33 to levels found in females was not sufficient to render male-derived CHCs attractive to males. Enantiopure synthetic 7-MeC31 and 7-MeC33 might have caused different effects but were not available. We conclude that female-derived CHCs function as a contact sex pheromone in U. rufipes. Our data suggest that methyl-branched and n-alkanes act synergistically and that the sex-specific relative composition of the whole profile, rather than the abundances of single components, underlies the elicitation of male courtship behavior.
On a two-component $π$-Camassa--Holm system
Creators: name: Kohlmann, Martin
Publisher: name: arXiv
Year: 2011
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 53C21, 53D25, 58B25, 58D05

description: A novel $π$-Camassa--Holm system is studied as a geodesic flow on a semidirect product obtained from the diffeomorphism group of the circle. We present the corresponding details of the geometric formalism for metric Euler equations on infinite-dimensional Lie groups and compare our results to what has already been obtained for the usual two-component Camassa--Holm equation. Our approach results in well-posedness theorems and explicit computations of the sectional curvature.
description: 12 pages
You had mail : a comparison of reflecting on positive and negative emails
Creators: name: Kopperson, Caitlin Nicole
Publisher: name: University of British Columbia
Year: 2017

description: Self-reflection has long been viewed as a means to insight and well-being. However, the construction of the self in today’s digital world includes communication and actions undertaken online as well as “in real life,” creating an external memory of personal communication unchanged by time and retelling. The current study examined possible consequences of reflection using personal email archives when used in conjunction with written reflection on significant positive and negative events. Participants (N = 66) were assigned to three gender-stratified groups comprising positive, negative, and neutral experience conditions. In each group, participants recalled and reflected upon a personal event of corresponding quality, reading personal email conversations regarding the experience followed by writing about it. Measures of well-being, meaning, nostalgia, relationship perception, and emotional reactivity were completed before and after the reflective manipulation and at follow-up, administered electronically two weeks following. A measure of thought content was administered at post-test and follow-up only. Data analyses were conducted using multiple mixed-design ANOVAs. Results at post-test showed significant increases in negative affect, nostalgia, and positive meaning, as well as a significant decrease in presence of meaning in life. At follow-up, results revealed a significant decrease in emotional reactivity for participants in the negative experience condition only. Additionally, significant decreases in positive affect, nostalgia, and recounting-type thoughts were found at follow-up. Implications for future research and practice are discussed.
Backward error analysis and the substitution law for Lie group integrators
Creators: name: Lundervold, Alexander
name: Munthe-Kaas, Hans
Publisher: name: arXiv
Year: 2011
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65L05, 65L06, 37C10

description: Butcher series are combinatorial devices used in the study of numerical methods for differential equations evolving on vector spaces. More precisely, they are formal series developments of differential operators indexed over rooted trees, and can be used to represent a large class of numerical methods. The theory of backward error analysis for differential equations has a particularly nice description when applied to methods represented by Butcher series. For the study of differential equations evolving on more general manifolds, a generalization of Butcher series has been introduced, called Lie--Butcher series. This paper presents the theory of backward error analysis for methods based on Lie--Butcher series.
description: Minor corrections and additions. Final version
Optimized Protocol for the In Situ Derivatization of Glutathione with N-Ethylmaleimide in Cultured Cells and the Simultaneous Determination of Glutathione/Glutathione Disulfide Ratio by HPLC-UV-QTOF-MS
Creators: name: Sun, Xueni
name: Berger, Raffaela
name: Heinrich, Paul
name: Marchiq, I.
name: Pouyssegur, J.
name: Renner, Kathrin
name: Oefner, Peter J.
name: Dettmer, Katja
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: UV detection; cell culture; glutathione; glutathione disulfide; liquid chromatography; mass spectrometry
subject: 610 Medizin

description: Glutathione (GSH) and glutathione disulfide (GSSG) are commonly used to assess the oxidative status of a biological system. Various protocols are available for the analysis of GSH and GSSG in biomedical specimens. In this study, we present an optimized protocol for the in situ derivatization of GSH with N-ethylmaleimide (NEM) to prevent GSH autooxidation, and thus to preserve the GSH/GSSG ratio during sample preparation. The protocol comprises the incubation of cells in NEM containing phosphate buffered saline (PBS), followed by metabolite extraction with 80% methanol. Further, to preserve the use of QTOF-MS, which may lack the linear dynamic range required for the simultaneous quantification of GSH and GSSG in non-targeted metabolomics, we combined liquid chromatographic separation with the online monitoring of UV absorbance of GS-NEM at 210 nm and the detection of GSSG and its corresponding stable isotope-labeled internal standard by QTOF-MS operated with a 10 Da Q1 window. The limit of detection (LOD) for GS-NEM was 7.81 µM and the linear range extended from 15.63 µM to 1000 µM with a squared correlation coefficient R2 of 0.9997. The LOD for GSSG was 0.001 µM, and the lower limit of quantification (LLOQ) was 0.01 µM, with the linear (R2 = 0.9994) range extending up to 10 µM. The method showed high repeatability with intra-run and inter-run coefficients of variation of 3.48% and 2.51% for GS-NEM, and 3.11% and 3.66% for GSSG, respectively. Mean recoveries of three different spike-in levels (low, medium, high) of GSSG and GS-NEM were above 92%. Finally, the method was applied to the determination of changes in the GSH/GSSG ratio either in response to oxidative stress in cells lacking one or both monocarboxylate transporters MCT1 and MCT4, or in adaptation to the NADPH (nicotinamide adenine dinucleotide phosphate) consuming production of D-2-hydroxyglutarate in cells carrying mutations in the isocitrate dehydrogenase genes IDH1 and IDH2.
Does Amount of Pre-cue Encoding Modulate Selective List Method Directed Forgetting?
Creators: name: Kliegl, Oliver
name: Pastötter, Bernhard
name: Bäuml, Karl-Heinz T.
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: episodic memory, forgetting, directed forgetting, selectivity, list length
subject: 150 Psychologie

description: Prior work reported evidence that when people are presented with both a relatively short list of relevant information and a relatively short list of irrelevant information, a subsequent cue to forget the irrelevant list can induce successful selective directed forgetting of the irrelevant list without any forgetting of the relevant list. The goal of the present study is to determine whether this selectivity effect is restricted to short lists of information (six items per list), or if the effect generalizes to longer lists (12 items per list). In Experiment 1, we replicate the finding that selective directed forgetting can occur when short lists of relevant and irrelevant information are involved. Going beyond this replication, we show in Experiment 2 that such selectivity can arise both when shorter and when relatively long lists of items are used. The results are consistent with the view that selective directed forgetting can result from the action of a flexible inhibitory mechanism. They are less well in line with the view that selective cues to forget pre-cue information induce a change in participants' mental context.
The Effects of Technological Developments on Work and Their Implications for Continuous Vocational Education and Training: A Systematic Review
Creators: name: Beer, Patrick
name: Mulder, Regina H.
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: technology, work characteristics, continuous vocational education and training, automation, work demands, systematic review
subject: 370 Erziehung, Schul- und Bildungswesen

description: Technology is changing the way organizations and their employees need to accomplish their work. Empirical evidence on this topic is scarce. The aim of this study is to provide an overview of the effects of technological developments on work characteristics and to derive the implications for work demands and continuous vocational education and training (CVET). The following research questions are answered: What are the effects of new technologies on work characteristics? What are the implications thereof for continuous vocational education and training? Technologies, defined as digital, electrical or mechanical tools that affect the accomplishment of work tasks, are considered in various disciplines, such as sociology or psychology. A theoretical framework based on theories from these disciplines (e.g., upskilling, task-based approach) was developed and statements on the relationships between technology and work characteristics, such as complexity, autonomy, or meaningfulness, were derived. A systematic literature review was conducted by searching databases from the fields of psychology, sociology, economics and educational science. Twenty-one studies met the inclusion criteria. Empirical evidence was extracted and its implications for work demands and CVET were derived by using a model that illustrates the components of learning environments. Evidence indicates an increase in complexity and mental work, especially while working with automated systems and robots. Manual work is reported to decrease on many occasions. Workload and workflow interruptions increase simultaneously with autonomy, especially with regard to digital communication devices. Role expectations and opportunities for development depend on how the profession and the technology relate to each other, especially when working with automated systems. The implications for the work demands necessary to deal with changes in work characteristics include knowledge about technology, openness toward change and technology, skills for self- and time management and for further professional and career development. Implications for the design of formal learning environments (i.e., the content, method, assessment, and guidance) include that the work demands mentioned must be part of the content of the trainings, the teachers/trainers must be equipped to promote those work demands, and that instruction models used for the learning environments must be flexible in their application.
On monoids of injective partial selfmaps almost everywhere the identity
Creators: name: Chuchman, Ivan
name: Gutik, Oleg
Publisher: name: arXiv
Year: 2010
Subjects: subject: Group Theory (math.GR)
subject: General Topology (math.GN)
subject: FOS: Mathematics
subject: 22A15, 20M20, 06F30, 20M18, 22A26, 54E52, 54H12, 54H15

description: In this paper we study the semigroup $\mathscr{I}^{\infty}_λ$ of injective partial selfmaps almost everywhere the identity of a set of infinite cardinality $λ$. We describe the Green relations on $\mathscr{I}^{\infty}_λ$, all (two-sided) ideals and all congruences of the semigroup $\mathscr{I}^{\infty}_λ$. We prove that every Hausdorff hereditary Baire topology $τ$ on $\mathscr{I}^{\infty}_ω$ such that $(\mathscr{I}^{\infty}_ω,τ)$ is a semitopological semigroup is discrete and describe the closure of the discrete semigroup $\mathscr{I}^{\infty}_λ$ in a topological semigroup. Also we show that for an infinite cardinal $λ$ the discrete semigroup $\mathscr{I}^{\infty}_λ$ does not embed into a compact topological semigroup and construct two non-discrete Hausdorff topologies turning $\mathscr{I}^{\infty}_λ$ into a topological inverse semigroup.
description: 16 pages
Effective SLOPE: EffectS of Lifestyle interventions in Older PEople with obesity: a systematic review and network meta-analysis protocol
Creators: name: Torbahn, Gabriel
name: Schoene, Daniel
name: Schwingshackl, Lukas
name: Rücker, Gerta
name: Knüttel, Helge
name: Kemmler, Wolfgang
name: Sieber, Cornel C.
name: Batsis, John A.
name: Villareal, Dennis T.
name: Stroebele-Benschop, Nanette
name: Volkert, Dorothee
name: Kiesswetter, Eva
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: 610 Medizin

description: Introduction: Obesity is highly prevalent in older adults aged 65 years or older. Different lifestyle interventions (diet, exercise, self-management) are available but benefits and harms have not been fully quantified comparing all available health promotion interventions. Special consideration must be given to functional outcomes and possible adverse effects (loss of muscle and bone mass, hypoglycaemia) of weight loss interventions in this age group. The objective of this study is to synthesise the evidence regarding the effects of different types and modalities of lifestyle interventions, or their combinations, on physical function and obesity-related outcomes such as body composition in older adults with obesity. Methods and analyses: Six databases (Medline, Embase, Cochrane Central Register of Controlled Trials, Cumulated Index to Nursing and Allied Health Literature (CINAHL), Psychinfo and Web of Science) and two trial registries (Clinicaltrials.gov and the WHO International Clinical Trials Registry Platform) will be searched for randomised controlled trials of lifestyle interventions in older adults with obesity. Screening (title/abstract and full-text) and data extraction of references as well as assessment of risk of bias and rating of the certainty of evidence (Grading of Recommendations, Assessment, Development and Evaluation for network meta-analyses) will be performed by two reviewers independently. Frequentist random-effects network meta-analyses will be conducted to determine the pooled effects from each intervention. Ethics and dissemination: We will submit our findings to peer-reviewed journals and present at national and international conferences as well as in scientific medical societies. Patient-targeted dissemination will involve local and national advocate groups. PROSPERO registration number CRD42019147286.
Interference and shot noise in a degenerate Anderson-Holstein model
Creators: name: Donarini, Andrea
name: Niklas, Michael
name: Grifoni, Milena
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: 530 Physik

description: We study the transport properties of an Anderson-Holstein model with orbital degeneracies and a tunneling phase that allows for the formation of dark states. The resulting destructive interference yields a characteristic pattern of positive and negative differential conductance features with enhanced shot noise, without further asymmetry requirements in the coupling to the leads. The transport characteristics are strongly influenced by the Lamb-shift renormalization of the system Hamiltonian. Thus, the electron-vibron coupling cannot be extracted by a simple fit of the current steps to a Poisson distribution. For strong vibronic relaxation, a simpler effective model with analytical solution allows for a better understanding and moreover demonstrates the robustness of the described effects.
Delta-gravity and Dark Energy
Creators: name: Alfaro, J.
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present a model of the gravitational field based on two symmetric tensors. The equations of motion of test particles are derived: Massive particles do not follow a geodesic but massless particles trajectories are null geodesics of an effective metric. Outside matter, the predictions of the model coincide exactly with General Relativity, so all classical tests are satisfied. In Cosmology, we get accelerated expansion without a cosmological constant.
description: latex, 15 pages, accepted for publication in Physics Letters B
Entropy Balance Equation of Spacetime Thermodynamics in f(R) Gravity
Creators: name: Yokokura, Yuki
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study spacetime thermodynamics for non-equilibrium processes. We first generalize the formulation of spacetime thermodynamics by using an observer outside the horizon. Then we construct the entropy balance equation of spacetime thermodynamics for non-equilibrium processes in f(R) gravity. The coefficients of the expansion and shear terms are equal to the viscosities of the black hole membrane paradigm, and a new entropy production term appears.
description: 15 pages, 3 figures; Revised argument
Theory of magnetotransport in shaped topological insulator nanowires
Creators: name: Graf, Ansgar
name: Kozlovsky, Raphael
name: Richter, Klaus
name: Gorini, Cosimo
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: 530 Physik

description: It is demonstrated that shaped topological insulator (TI) nanowires, i.e., such that their cross-section radius varies along the wire length, can be tuned into a number of different transport regimes when immersed in a homogeneous coaxial magnetic field. This is in contrast with widely studied tubular nanowires with constant cross section, and is due to magnetic confinement of Dirac surface carriers. In flat two-dimensional systems, such a confinement requires inhomogeneous magnetic fields, while for shaped nanowires of standard size homogeneous fields of the order of B∼1T are sufficient. We put recent work [R. Kozlovsky et al., Phys. Rev. Lett. 124, 126804 (2020)] into broader context and extend it to deal with axially symmetric wire geometries with arbitrary radial profile. A dumbbell-shaped TI nanowire is used as a paradigmatic example for transport through a constriction and shown to be tunable into five different transport regimes: (i) conductance steps, (ii) resonant transmission, (iii) current suppression, (iv) Coulomb blockade, and (v) transport through a triple quantum dot. Switching between regimes is achieved by modulating the strength of a coaxial magnetic field and does not require strict axial symmetry of the wire cross section. As such, it should be observable in TI nanowires fabricated with available experimental techniques.
Quantum anomalous Hall effects in graphene from proximity-induced uniform and staggered spin-orbit and exchange coupling
Creators: name: Högl, Petra
name: Frank, Tobias
name: Zollner, Klaus
name: Kochan, Denis
name: Gmitra, Martin
name: Fabian, Jaroslav
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: spintronics, graphene, topological states
subject: 530 Physik

description: We investigate an effective model of proximity modified graphene (or symmetrylike materials) with broken time-reversal symmetry. We predict the appearance of quantum anomalous Hall phases by computing bulk band gap and Chern numbers for benchmark combinations of system parameters. Allowing for staggered exchange field enables quantum anomalous Hall effect in flat graphene with Chern number C=1. We explicitly show edge states in zigzag and armchair nanoribbons and explore their localization behavior. Remarkably, the combination of staggered intrinsic spin-orbit and uniform exchange coupling gives topologically protected (unlike in time-reversal systems) pseudohelical states, whose spin is opposite in opposite zigzag edges. Rotating the magnetization from out of plane to in plane makes the system trivial, allowing us to control topological phase transitions. We also propose, using density functional theory, a material platform—graphene on Ising antiferromagnet MnPSe3—to realize staggered exchange (pseudospin Zeeman) coupling.
Bar-cobar duality for operads in stable homotopy theory
Creators: name: Ching, Michael
Publisher: name: arXiv
Year: 2010
Subjects: subject: Algebraic Topology (math.AT)
subject: Category Theory (math.CT)
subject: FOS: Mathematics
subject: 55P48 (Primary) 18D50 (Secondary)

description: We extend bar-cobar duality, defined for operads of chain complexes by Getzler and Jones, to operads of spectra in the sense of stable homotopy theory. Our main result is the existence of a Quillen equivalence between the category of reduced operads of spectra (with the projective model structure) and a new model for the homotopy theory of cooperads of spectra. The crucial construction is of a weak equivalence of operads between the Boardman-Vogt W-construction for an operad P, and the cobar-bar construction on P. This weak equivalence generalizes a theorem of Berger and Moerdijk that says the W- and cobar-bar constructions are isomorphic for operads of chain complexes. Our model for the homotopy theory of cooperads is based on `pre-cooperads'. These can be viewed as cooperads in which the structure maps are zigzags of maps of spectra that satisfy coherence conditions. Our model structure on pre-cooperads is such that every object is weakly equivalent to an actual cooperad, and weak equivalences between cooperads are detected in the underlying symmetric sequences. We also interpret our results in terms of a `derived Koszul dual' for operads of spectra, which is analogous to the Ginzburg-Kapranov dg-dual. We show that the `double derived Koszul dual' of an operad P is equivalent to P (under some finiteness hypotheses) and that the derived Koszul construction preserves homotopy colimits, finite homotopy limits and derived mapping spaces for operads.
description: Reorganized and condensed, 41 pages, 4 figures, to appear in Journal of Topology
Kevin Ireland Interview
Creators: name: Institute For Diversity & Civic Life
name: Department Of Religious Studies
Publisher: name: The University of Texas at Austin
Year: 2021
Subjects: Religions Texas
Activism
Austin
Austin Presbyterian Theological Seminary
Christians
Gender roles
Gender identity
Generation X
Intersectionality
Kansas
Musicians
LGBTQ+
Parenthood
Presbyterians
Reformed tradition
Seminarians
Texas

description: This interview is with Kevin Ireland, a seminarian studying at Austin Presbyterian Theological Seminary. Kevin talks about his perceptions of gender growing up, including the media and family dynamics that shaped those perceptions. He talks about his experiences parenting a child in the LGBTQ+ community, such as supporting their engagement with the Texas legislature.
Blank : a ghostly story
Creators: name: Woodworth, Danielle
Publisher: name: The University of St Andrews
Year: 2023
Subjects: Creative writing thesis
Young adult fiction
Prose writing
Fiction
Novel fragment
Setting : Idaho
Supernatural

description: This work is the first seven chapters of a middle grade or young adult novel in the urban fantasy genre. These chapters introduce the two main characters and some supporting characters. Foremost among these supporting characters are an aunt, a grandfather, and a ghost. The grandfather and the ghost have peripheral roles in the contained chapters, but become more involved in the plot as the novel continues. The events in the chapters first provide necessary interactions between the main characters. Starting in the first chapter, their interactions cause these characters to bond and begin a friendship. The friendship will be the driving force of the main plot. These chapters also contain incidents and information that will become relevant later on.
Chiral Majorana fermions in graphene from proximity-induced superconductivity
Creators: name: Högl, Petra
name: Frank, Tobias
name: Kochan, Denis
name: Gmitra, Martin
name: Fabian, Jaroslav
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: graphene, superconductivity, topological states, spin-orbit coupling
subject: 530 Physik

description: We present a detailed theoretical study of chiral topological superconductor phases in proximity-superconducting graphene systems based on an effective model inspired by density functional theory simulations. Inducing s-wave superconductivity in quantum anomalous Hall effect systems leads to chiral topological superconductors. For out-of-plane magnetization we find topological superconducting phases with even numbers of chiral Majorana fermions per edge, which is correlated with the opening of a nontrivial gap in the bulk system in the K points and their connection under particle-hole symmetry. We show that in a quantum anomalous Hall insulator with in-plane magnetization and a nontrivial gap opening at M, the corresponding topological superconductor can be tuned to host only single chiral Majorana states at its edge, which is promising for proposals exploiting such states for braiding operations.
Essays on structural models in corporate finance
Creators: name: Valdivieso, Ercos
Publisher: name: University of British Columbia
Year: 2017

description: This thesis contains two essays in Structural Corporate Finance. The first essay studies the effect of asset redeployability on the cross-section of firms’ financial leverage and credit spreads. Particularly, I show that in the data firms’ ability to sell assets — captured by a novel measure of asset redeployability — correlates positively with financial leverage, and negatively with credit spreads. At odds with traditional notions of asset redeployability, I show that these predictions remain even after controlling for proxies of creditors’ recovery rates. To understand these empirical findings, I build a quantitative model where firms’ asset redeployability decreases the degree of investment irreversibility and deadweight cost of bankruptcy. According to the model, while higher overall asset redeployability predicts larger financial leverage and lower credit spread; these relations are mainly driven by differences in the degree of investment irreversibility across firms. Also, within the model, differences in recovery rates are mainly explained by differences in deadweight costs of bankruptcy. Based on these results, I conclude that the link between firms’ asset redeployability and disinvestment flexibilities is key to understand the empirical ability of asset redeployability to predict financial leverage and credit spreads. The second essay provides new evidence about the cross-sectional distribution of debt issuance: its dispersion is highly procyclical. Furthermore, I show that this dynamic feature is mainly driven by large adjustments of the stock of debt and capital observed in good times. Previous research has highlighted the role of non-convex rigidities on inducing large adjustments on firms decisions. Then, to quantify the contribution of real and financial non-convex frictions on shaping the dynamic of the debt issuance cross-sectional distribution, I build a quantitative model where firms take investment and financing decisions. According to the model, both real and financial non-convex frictions are required to reproduce the dynamic of the cross-sectional dispersion of debt issuance. Indeed, the presence of these frictions makes firms’ decisions less responsive during recessions. Yet, in booms, both non-convex costs induce large adjustment on the capital and debt stock of high-growth firms.
Cosmological surveys with the Australian Square Kilometre Array Pathfinder
Creators: name: Duffy, Alan R.
name: Moss, Adam
name: Staveley-Smith, Lister
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: This is a design study into the capabilities of the Australian Square Kilometre Array Pathfinder in performing a full-sky low redshift neutral hydrogen survey, termed WALLABY, and the potential cosmological constraints one can attain from measurement of the galaxy power spectrum. We find that the full sky survey will likely attain 0.6 million redshifts which, when combined with expected Planck CMB data, will constrain the Dark Energy equation of state to 20%, representing a coming of age for radio observations in creating cosmological constraints.
description: 10 pages, 6 figures, accepted in PASA, updated to match published version
Dynamic Quenching of Triplet Excitons in Single Conjugated Polymer Chains
Creators: name: Schedlbauer, Jakob
name: Scherf, Ullrich
name: Vogelsang, Jan
name: Lupton, John M.
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: 530 Physik

description: By measuring the fluorescence photon statistics of single chains of a conjugated polymer, we determine the lifetime of the metastable dark state, the triplet exciton. The single molecule emits single photons one at a time, giving rise to photon antibunching. These photons appear bunched in time over longer time scales because of excursions to the triplet dark state. Remarkably, this triplet intermittency in the fluorescence is spontaneously suppressed over time scales of seconds, implying that either triplet formation is inhibited or that triplets are selectively quenched without the singlet fluorescence being affected. Such discrete switching in the strength of photon bunching is only seen in highly ordered and rigid chains of a ladder-type conjugated polymer. It does not occur in single dye molecules. We propose that trapped photogenerated charges on the chain selectively quench triplets but not singlets, presumably because the effective diffusion length of triplets is longer along the highly rigid ladder-type backbone.
Phenolic composition, antioxidant, and cytotoxic effects on HeLa and HepG2 cancer cell lines of Mespilus germanica grown in Turkey
Creators: name: Yunusa, Umar Muazu
name: OZTURK UREK, Raziye
Publisher: name: figshare
Year: 2023
Subjects: Biologically active molecules
Characterisation of biological macromolecules
Free radical chemistry
Natural products and bioactive compounds

description: This study screened flavonoids and phenolic acids, antioxidant and cytotoxic effects of Mespilus germanica leaf and fruit samples. The RP-HPLC-DAD analysis allowed the identification of hesperidin, epicatechin, epigallocatechin, benzoic, p-hydroxybenzoic, vanillic, protocatechuic, syringic, caffeic, ferulic, sinapic and p-coumaric acids in various extracts. Fruit BHPA, leaf BPBH2, and leaf free flavan-3-ol extracts exhibited the largest DPPH, OH and NO radicals scavenging activity, respectively. Furthermore, fruit BPBH1, leaf BPAH2 and leaf BPBH1 extracts showed the highest ferrous ion chelation, ferric ion reducing power and FRAP value, respectively. Moreover, leaf flavone extract showed remarkable cytotoxicity on the HepG2 cell line (IC50 = 36.49±1.12 μg/mL) as well as strong •OH scavenging and Fe2+ chelation activities; similarly, leaf BPAH1 extract demonstrated excellent cytotoxicity on HeLa cell line (IC50 = 36.24±1.89 μg/mL). This study suggests Turkish medlar as a natural source of phenolic compounds with potential application in food and pharmaceutical industries as anticancer/antioxidant agents.
Hybridized intervalley moiré excitons and flat bands in twisted WSe2 bilayers
Creators: name: Brem, Samuel
name: Lin, Kai-Qiang
name: Gillen, Roland
name: Bauer, Jonas
name: Maultzsch, Janina
name: Lupton, John M.
name: Malic, Ermin
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: 530 Physik

description: The large surface-to-volume ratio in atomically thin 2D materials allows to efficiently tune their properties through modifications of their environment. Artificial stacking of two monolayers into a bilayer leads to an overlap of layer-localized wave functions giving rise to a twist angle-dependent hybridization of excitonic states. In this joint theory-experiment study, we demonstrate the impact of interlayer hybridization on bright and momentum-dark excitons in twisted WSe2 bilayers. In particular, we show that the strong hybridization of electrons at the Λ point leads to a drastic redshift of the momentum-dark K–Λ exciton, accompanied by the emergence of flat moiré exciton bands at small twist angles. We directly compare theoretically predicted and experimentally measured optical spectra allowing us to identify photoluminescence signals stemming from phonon-assisted recombination of layer-hybridized dark excitons. Moreover, we predict the emergence of additional spectral features resulting from the moiré potential of the twisted bilayer lattice.
title: "Statua di Afrodite con testa moderna di Artemide", arte romana, inv. CLXVIII (ITA/EN)
title: Scheda catalogo digitale Borghese
titleType: AlternativeTitle
Creators: name: Clementi, Jessica
name: Galleria Borghese
Publisher: name: Galleria Borghese
Year: 2024

description: Pubblicazione delle schede delle opere conservate nel museo ed estratte dal catalogo digitale di

Galleria Borghese, nelle due versioni esistenti online, in italiano e inglese.

Collegamento al catalogo digitale:

ITA: https://www.collezionegalleriaborghese.it/

EN: https://www.collezionegalleriaborghese.it/en
Unitarizable representations of quivers
Creators: name: Weist, Thorsten
name: Yusenko, Kostyantyn
Publisher: name: arXiv
Year: 2010
Subjects: subject: Representation Theory (math.RT)
subject: Algebraic Geometry (math.AG)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 16G20, 16G60, 47A67

description: We investigate representations of *-algebras associated with posets. Unitarizable representations of the corresponding (bound) quivers (which are polystable representations for some appropriately chosen slope function) give rise to representations of these algebras. Considering posets which correspond to unbound quivers this leads to an ADE-classification which describes the unitarization behaviour of their representations. Considering posets which correspond to bound quivers, it is possible to construct unitarizable representations starting with polystable representations of related unbound quivers which can be glued together with a suitable direct sum of simple representations. Finally, we estimate the number of complex parameters parametrizing irreducible unitary non-equivalent representations of the corresponding algebras.
description: 27 pages, Section 2.3 reorganized, final version, to appear in Algebras and Representation Theory
Interphase histone H3 serine 10 phosphorylation in mouse embryonic stem cells
Creators: name: Chen, Carol Chia-Lu
Publisher: name: University of British Columbia
Year: 2018

description: Phosphorylation of histone H3 at serine 10 (H3S10ph) has been observed in two paradoxical contexts, depending on the stage of the cell cycle – it is a hallmark of condensed mitotic chromatin, but is also found at specific mitogen-inducible genic promoters and distal enhancers. In the work presented in this thesis, I derived a mouse embryonic stem cell (ESC) line harbouring an endogenous fluorescent cell cycle reporter (FUCCI) in combination with next-generation sequencing to comprehensively map H3S10ph at distinct stages of the mammalian cell cycle and examined the crosstalk between this mark and the repressive mark, H3K9me. I found that H3S10ph broadly demarcates gene-rich, early-replicating euchromatic regions in G1, marking up to 30% of the ESC genome. Reminiscent of H3S10ph deposited by JIL-1 kinase in Drosophila, interphase H3S10ph pervasively marks gene-dense regions to prevent the accumulation of H3K9me2 at actively transcribed genes in ESCs. In contrast to H3S10ph at euchromatin, mitotic phosphorylation mediated by Aurora kinase is also detectable in ESCs in G1 at young endogenous retroviruses (ERVs), specifically in combination with H3K9me3. Finally, to identify the kinases responsible for interphase H3S10ph, I generated knockout (KO) ESC lines of serine kinases homologous to JIL-1, including Msk1/2 and Rsk1/2/3/4. Msk2-/- ESCs showed the greatest loss of interphase H3S10ph at active promoter/enhancers. Furthermore, known H3K9me3 repressed targets, including imprinted genes, young ERVs and germline genes, were downregulated in MSK2-deficient cells. Taken together, this work revealed that H3S10ph plays a previously unappreciated role in interphase chromatin architecture and facilitates appropriate genic transcription by countering the repressive effects exerted by H3K9 methyltransferases.
Peristaltic Pumping of Blood Through Small Vessels of Varying Cross-section
Creators: name: Misra, J. C.
name: Maiti, S.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Mathematical Physics (math-ph)
subject: Biological Physics (physics.bio-ph)
subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: The paper is devoted to a study of the peristaltic motion of blood in the micro-circulatory system. The vessel is considered to be of varying cross-section. The progressive peristaltic waves are taken to be of sinusoidal nature. Blood is considered to be a Herschel-Bulkley fluid. Of particular concern here is to investigate the effects of amplitude ratio, mean pressure gradient, yield stress and the power law index on the velocity distribution, streamline pattern and wall shear stress. On the basis of the derived analytical expression, extensive numerical calculations have been made. The study reveals that velocity of blood and wall shear stress are appreciably affected due to the non-uniform geometry of blood vessels. They are also highly sensitive to the magnitude of the amplitude ratio and the value of the fluid index.
description: Accepted for publication in ASME journal of Applied Mechanics. arXiv admin note: text overlap with arXiv:1108.1285v1
Dracocephalum moldavica L. extract alleviates experimental colitis in rat by modulating gut microbiome and inflammatory pathways
Creators: name: 张军(陈)
Publisher: name: CNGB
Year: 2023
Subjects: Raw sequence reads
Targeted loci cultured
Multispecies

description: Studies have shown that imbalance of gut microbiota participated in intestinal inflammation associated with ulcerative colitis (UC). Therefore, regulating the homeostasis of gut microbiota plays an important role in treating UC. We observed that DML extract administration increased the count of Lactobacillus and decreased the count of Romboutsia.
Cox rings and pseudoeffective cones of projectivized toric vector bundles
Creators: name: Gonzalez, Jose
name: Hering, Milena
name: Payne, Sam
name: Süß, Hendrik
Publisher: name: arXiv
Year: 2010
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14C20, 14J60, 14M25 14L30, 14H10

description: We study projectivizations of a special class of toric vector bundles that includes cotangent bundles, whose associated Klyachko filtrations are particularly simple. For these projectivized bundles, we give generators for the cone of effective divisors and a presentation of the Cox ring as a polynomial algebra over the Cox ring of a blowup of a projective space along a sequence of linear subspaces. As applications, we show that the projectivized cotangent bundles of some toric varieties are not Mori dream spaces and give examples of projectivized toric vector bundles whose Cox rings are isomorphic to that of M_{0,n}.
description: 20 pages. v2: Revised and expanded, treating a larger class of toric vector bundles and giving new examples whose Cox rings are related to that of M_{0,n}
Resurgence of an international hepatitis A outbreak linked to imported frozen strawberries, Germany, 2018 to 2020
Creators: name: Ruscher, Claudia
name: Faber, Mirko
name: Werber, Dirk
name: Stark, Klaus
name: Bitzegeio, Julia
name: Michaelis, Kai
name: Sagebiel, Daniel
name: Wenzel, Jürgen J.
name: Enkelmann, Julia
Publisher: name: Universität Regensburg
Year: 2020
Subjects: subject: 610 Medizin

description: Following outbreaks linked to frozen strawberries in Sweden and Austria in 2018, 65 cases linked to the same hepatitis A virus strain were detected in Germany between October 2018 and January 2020, presenting in two waves. Two case-control studies and a comparison of cases' consumption frequencies with purchase data from a large consumer panel provided strong evidence for frozen strawberry cake as the main vehicle of transmission. Of 46 cases interviewed, 27 reported consuming frozen strawberry cake and 25 of these identified cake(s) from brand A spontaneously or in product picture-assisted recall. Trace back investigations revealed that the Polish producer involved in the previous outbreaks in Sweden and Austria had received frozen strawberries from Egypt via a wholesaler that also delivered frozen strawberries to manufacturer of brand A. Phylogenetic analyses linked the outbreak strain to similar strains formerly isolated from sewage, stool and strawberries in Egypt. Complete trace back and timely recall of products with strong evidence of contamination is important to control an outbreak and prevent later resurgence, particularly for food items with a long shelf life. Continued molecular surveillance of hepatitis A is needed to identify outbreaks and monitor the success of food safety interventions.
On the Asymptotic Validity of the Decoupling Assumption for Analyzing 802.11 MAC Protocol
Creators: name: Cho, Jeong-woo
name: Boudec, Jean-Yves Le
name: Jiang, Yuming
Publisher: name: arXiv
Year: 2011
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Information Theory (cs.IT)
subject: Performance (cs.PF)
subject: FOS: Computer and information sciences

description: Performance evaluation of the 802.11 MAC protocol is classically based on the decoupling assumption, which hypothesizes that the backoff processes at different nodes are independent. This decoupling assumption results from mean field convergence and is generally true in transient regime in the asymptotic sense (when the number of wireless nodes tends to infinity), but, contrary to widespread belief, may not necessarily hold in stationary regime. The issue is often related with the existence and uniqueness of a solution to a fixed point equation; however, it was also recently shown that this condition is not sufficient; in contrast, a sufficient condition is a global stability property of the associated ordinary differential equation. In this paper, we give a simple condition that establishes the asymptotic validity of the decoupling assumption for the homogeneous case. We also discuss the heterogeneous and the differentiated service cases and formulate a new ordinary differential equation. We show that the uniqueness of a solution to the associated fixed point equation is not sufficient; we exhibit one case where the fixed point equation has a unique solution but the decoupling assumption is not valid in the asymptotic sense in stationary regime.
description: 16 pages, 4 figures, accepted for publication in IEEE Transactions on Information Theory
A profile decomposition approach to the $L^\infty_t(L^3_x)$ Navier-Stokes regularity criterion
Creators: name: Gallagher, Isabelle
name: Koch, Gabriel S.
name: Planchon, Fabrice
Publisher: name: arXiv
Year: 2010
Subjects: subject: Analysis of PDEs (math.AP)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics

description: In this paper we continue to develop an alternative viewpoint on recent studies of Navier-Stokes regularity in critical spaces, a program which was started in the recent work by C. Kenig and the second author (Ann Inst H Poincaré Anal Non Linéaire 28(2):159-187, 2011). Specifically, we prove that strong solutions which remain bounded in the space $L^3(R^3)$ do not become singular in finite time, a known result established by Escauriaza, Seregin and Sverak (Uspekhi Mat Nauk 58(2(350)):3-44, 2003) in the context of suitable weak solutions. Here, we use the method of "critical elements" which was recently developed by Kenig and Merle to treat critical dispersive equations. Our main tool is a "profile decomposition" for the Navier-Stokes equations in critical Besov spaces which we develop here. As a byproduct of this tool, assuming a singularity-producing initial datum for Navier-Stokes exists in a critical Lebesgue or Besov space, we show there is one with minimal norm, generalizing a result of Rusin and Sverak (J Funct Anal 260(3):879-891, 2011).
description: 35 pages; Mathematische Annalen 2012
Mixed in a World of Truth and Lies: List Composition Moderates the Effects of a Lie Fabrication Manipulation on Memory and Metamemory.
Creators: name: Kaya, Samet
name: Ünal, Belgin
name: Besken, Miri
Publisher: name: SAGE Publications
Year: 2024

description: Research has shown that list composition moderates the effects of encoding manipulations on memory performance; differential memory performance is observed at distinct levels of the independent variable in mixed lists, but not in pure lists. The current study aims to investigate the effect of list composition on predicted and actual memory performance using a semantic lie fabrication manipulation. In Experiment 1, participants either told the truth or fabricated a lie in response to a set of general knowledge questions in a mixed-list design, made memory predictions for each response, and received a free recall test. Experiments 2A and 2B compared the effect of list composition by employing mixed and pure lists, respectively. The results showed that the lie fabrication led to a metacognitive illusion in mixed lists by inducing a crossed double dissociation between memory and metamemory. Participants produced higher memory performance and lower memory predictions for lies than the truth. In contrast, predicted and actual memory performance were similar for truth and lies in pure lists. These findings contribute to the existing body of knowledge on list composition and have implications for situations where individuals need to maintain and remember their fabricated lies.