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The pressure metric on the Margulis multiverse

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This paper defines the pressure metric on the Moduli space of Margulis spacetimes without cusps and shows that it is positive definite on the constant entropy sections. It also demonstrates an identity … regarding the variation of the cross-ratios.

Author: Sourav Ghosh

Date Published: 1st Apr 2018

Publication Type: Journal

Convex projective generalized Dehn filling

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For d = 4,5,6, we exhibit the first examples of complete finite volume hyperbolic d-manifolds M with cusps such that infinitely many d-orbifolds M_m obtained from M by generalized Dehn filling admit … properly convex real projective structures. The orbifold fundamental groups of M_m are Gromov-hyperbolic relative to a collection of subgroups virtually isomorphic to \mathbbZ^d-2, hence the images of the developing maps of the projective structures on M_m are new examples of divisible properly convex domains of the projective d-space which are not strictly convex, in contrast to the previous examples of Benoist.

Authors: Suhyoung Choi, Gye-Seon Lee, Ludovic Marquis

Date Published: 30th Mar 2018

Publication Type: Journal

Universal relations for differentially rotating relativistic stars at the threshold to collapse

Abstract

Not specified

Authors: Gabriele Bozzola, Nikolaos Stergioulas, Andreas Bauswein

Date Published: 1st Mar 2018

Publication Type: Journal

An updated Type II supernova Hubble diagram

Abstract

Not specified

Authors: E. E. E. Gall, R. Kotak, B. Leibundgut, S. Taubenberger, W. Hillebrandt, M. Kromer, W. S. Burgett, K. Chambers, H. Flewelling, M. E. Huber, N. Kaiser, R. P. Kudritzki, E. A. Magnier, N. Metcalfe, K. Smith, J. L. Tonry, R. J. Wainscoat, C. Waters

Date Published: 1st Mar 2018

Publication Type: Journal

Protein S-Bacillithiolation Functions in Thiol Protection and Redox Regulation of the Glyceraldehyde-3-Phosphate Dehydrogenase Gap in Staphylococcus aureus Under Hypochlorite Stress.

Abstract (Expand)

AIMS: Bacillithiol (BSH) is the major low-molecular-weight thiol of the human pathogen Staphylococcus aureus. In this study, we used OxICAT and Voronoi redox treemaps to quantify hypochlorite-sensitive … protein thiols in S. aureus USA300 and analyzed the role of BSH in protein S-bacillithiolation. RESULTS: The OxICAT analyses enabled the quantification of 228 Cys residues in the redox proteome of S. aureus USA300. Hypochlorite stress resulted in >10% increased oxidation of 58 Cys residues (25.4%) in the thiol redox proteome. Among the highly oxidized sodium hypochlorite (NaOCl)-sensitive proteins are five S-bacillithiolated proteins (Gap, AldA, GuaB, RpmJ, and PpaC). The glyceraldehyde-3-phosphate (G3P) dehydrogenase Gap represents the most abundant S-bacillithiolated protein contributing 4% to the total Cys proteome. The active site Cys151 of Gap was very sensitive to overoxidation and irreversible inactivation by hydrogen peroxide (H2O2) or NaOCl in vitro. Treatment with H2O2 or NaOCl in the presence of BSH resulted in reversible Gap inactivation due to S-bacillithiolation, which could be regenerated by the bacilliredoxin Brx (SAUSA300_1321) in vitro. Molecular docking was used to model the S-bacillithiolated Gap active site, suggesting that formation of the BSH mixed disulfide does not require major structural changes. Conclusion and Innovation: Using OxICAT analyses, we identified 58 novel NaOCl-sensitive proteins in the pathogen S. aureus that could play protective roles against the host immune defense and include the glycolytic Gap as major target for S-bacillithiolation. S-bacillithiolation of Gap did not require structural changes, but efficiently functions in redox regulation and protection of the active site against irreversible overoxidation in S. aureus. Antioxid. Redox Signal. 28, 410-430.

Authors: Marcel Imber, Nguyen Thi Thu Huyen, Agnieszka J. Pietrzyk-Brzezinska, Vu Van Loi, Melanie Hillion, Jörg Bernhardt, Lena Thärichen, Katra Kolšek, Malek Saleh, Chris J. Hamilton, Lorenz Adrian, Frauke Gräter, Markus C. Wahl, Haike Antelmann

Date Published: 20th Feb 2018

Publication Type: Journal

The Progenitor Systems of Thermonuclear Supernovae

Abstract (Expand)

Despite the importance of Type Ia supernovae for modern astrophysics, their detailed explosion mechanism is still not fully understood. In this article, we present recent findings from numerical models …els in the context of their observed diversity and we discuss how these models can help to shed light on the explosion mechanism and to identify their progenitor systems. It is shown that the models have considerable predictive power and they can aid the identification of sources of systematic errors when used as distance indicators for cosmology.

Authors: W. Hillebrandt, M. Bulla, M. Kromer, R. Pakmor, F. K. Röpke, M. Schrauth, S. A. Sim

Date Published: 1st Feb 2018

Publication Type: InProceedings

Towards Multidimensional Hydrodynamic Simulations of Stars

Abstract (Expand)

With the Seven-League Hydro (SLH) code, designed to model hydrodynamic flows in stellar interiors, simulations of dynamical processes in multidimensional hydrodynamic simulations are carried out. After …ter a description of the features of SLH, we present several examples of its applications to problems in stellar astrophysics.

Authors: F. K. Röpke, J. Berberich, P. F. V. Edelmann, L. Horst, S. W. Jones, A. Michel, A. Botto Poala

Date Published: 1st Feb 2018

Publication Type: InProceedings

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