Theory for hierarchical assembly with dielectrophoresis and the role of particle anisotropy

Correlations between supermassive black holes and hot gas atmospheres in IllustrisTNG and X-ray observations

Monthly Notices of the Royal Astronomical Society ◽

10.1093/mnras/staa3880 ◽

2020 ◽

Vol 501 (2) ◽

pp. 2210-2230

Author(s):

Nhut Truong ◽

Annalisa Pillepich ◽

Norbert Werner

Keyword(s):

Black Holes ◽

Supermassive Black Holes ◽

High Mass ◽

Mass Relation ◽

Host Galaxies ◽

X Ray ◽

Hierarchical Assembly ◽

Hot Gas ◽

The Masses

ABSTRACT Recent X-ray observations have revealed remarkable correlations between the masses of central supermassive black holes (SMBHs) and the X-ray properties of the hot atmospheres permeating their host galaxies, thereby indicating the crucial role of the atmospheric gas in tracing SMBH growth in the high-mass regime. We examine this topic theoretically using the IllustrisTNG cosmological simulations and provide insights to the nature of this SMBH – gaseous halo connection. By carrying out a mock X-ray analysis for a mass-selected sample of TNG100 simulated galaxies at $z$ = 0, we inspect the relationship between the masses of SMBHs and the hot gas temperatures and luminosities at various spatial and halo scales – from galactic (∼Re) to group/cluster scales (∼R500c). We find strong SMBH-X-ray correlations mostly in quenched galaxies and find that the correlations become stronger and tighter at larger radii. Critically, the X-ray temperature (kBTX) at large radii (r ≳ 5Re) traces the SMBH mass with a remarkably small scatter (∼0.2 dex). The relations emerging from IllustrisTNG are broadly consistent with those obtained from recent X-ray observations. Overall, our analysis suggests that, within the framework of IllustrisTNG, the present-time MBH–kBTX correlations at the high-mass end (MBH ≳ 108M⊙) are fundamentally a reflection of the SMBH mass–halo mass relation, which at such high masses is set by the hierarchical assembly of structures. The exact form, locus, and scatter of those scaling relations are, however, sensitive to feedback processes such as those driven by star formation and SMBH activity.

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Role of Gene 10 Protein in the Hierarchical Assembly of the Bacteriophage P22 Portal Vertex Structure†

Biochemistry ◽

10.1021/bi700186e ◽

2007 ◽

Vol 46 (30) ◽

pp. 8776-8784 ◽

Cited By ~ 29

Author(s):

Adam S. Olia ◽

Anshul Bhardwaj ◽

Lisa Joss ◽

Sherwood Casjens ◽

Gino Cingolani

Keyword(s):

Bacteriophage P22 ◽

Hierarchical Assembly

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Adaptor Function of PapF Depends on Donor Strand Exchange in P-Pilus Biogenesis of Escherichia coli

Journal of Bacteriology ◽

10.1128/jb.01648-06 ◽

2007 ◽

Vol 189 (14) ◽

pp. 5276-5283 ◽

Cited By ~ 21

Author(s):

Yvonne M. Lee ◽

Karen W. Dodson ◽

Scott J. Hultgren

Keyword(s):

Escherichia Coli ◽

Strand Exchange ◽

Hierarchical Assembly ◽

Pilus Biogenesis ◽

Donor Strand Exchange

ABSTRACT P-pilus biogenesis occurs via the highly conserved chaperone-usher pathway and involves the strict coordination of multiple subunit proteins. All nonadhesin structural P-pilus subunits possess the same topology, consisting of two domains: an incomplete immunoglobulin-like fold (pilin body) and an N-terminal extension. Pilus subunits form interactions with one another through donor strand exchange, occurring at the usher, in which the N-terminal extension of an incoming subunit completes the pilin body of the preceding subunit, allowing the incorporation of the subunit into the pilus fiber. In this study, pilus subunits in which the N-terminal extension was either deleted or swapped with that of another subunit were used to examine the role of each domain of PapF in functions involving donor strand exchange and hierarchical assembly. We found that the N-terminal extension of PapF is required to adapt the PapG adhesin to the tip of the fiber. The pilin body of PapF is required to efficiently initiate assembly of the remainder of the pilus, with the assistance of the N-terminal extension. Thus, distinct functions were assigned to each region of the PapF subunit. In conclusion, all pilin subunits possess the same overall architectural topology; however, each N-terminal extension and pilin body has specific functions in pilus biogenesis.

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Janus Particles at Fluid Interfaces: Stability and Interfacial Rheology

Nanomaterials ◽

10.3390/nano11020374 ◽

2021 ◽

Vol 11 (2) ◽

pp. 374

Author(s):

Elton L. Correia ◽

Nick Brown ◽

Sepideh Razavi

Keyword(s):

Colloidal Particles ◽

Janus Particles ◽

Shear Stresses ◽

Fluid Interfaces ◽

Interfacial Rheology ◽

Pickering Emulsions ◽

Interfacial Mechanics ◽

Anisotropic Surface ◽

Particle Anisotropy

The use of the Janus motif in colloidal particles, i.e., anisotropic surface properties on opposite faces, has gained significant attention in the bottom-up assembly of novel functional structures, design of active nanomotors, biological sensing and imaging, and polymer blend compatibilization. This review is focused on the behavior of Janus particles in interfacial systems, such as particle-stabilized (i.e., Pickering) emulsions and foams, where stabilization is achieved through the binding of particles to fluid interfaces. In many such applications, the interface could be subjected to deformations, producing compression and shear stresses. Besides the physicochemical properties of the particle, their behavior under flow will also impact the performance of the resulting system. This review article provides a synopsis of interfacial stability and rheology in particle-laden interfaces to highlight the role of the Janus motif, and how particle anisotropy affects interfacial mechanics.

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Role of particle anisotropy and deposition method on the patterning of nano-objects by the photovoltaic effect in LiNbO3

Optical Materials ◽

10.1016/j.optmat.2013.04.035 ◽

2013 ◽

Vol 35 (9) ◽

pp. 1700-1705 ◽

Cited By ~ 20

Author(s):

H. Burgos ◽

M. Jubera ◽

J. Villarroel ◽

A. García-Cabañes ◽

F. Agulló-López ◽

...

Keyword(s):

Photovoltaic Effect ◽

Deposition Method ◽

Particle Anisotropy

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The formation and evolution of bulges as traced by globular cluster systems

Proceedings of the International Astronomical Union ◽

10.1017/s1743921308017912 ◽

2007 ◽

Vol 3 (S245) ◽

pp. 281-284

Author(s):

Duncan A. Forbes ◽

Lee Spitler

Keyword(s):

Globular Clusters ◽

Hubble Space Telescope ◽

Host Galaxies ◽

Scaling Properties ◽

Hierarchical Assembly ◽

Secular Evolution ◽

Unique Method ◽

History Of ◽

Formation And Evolution

AbstractGlobular Clusters provide a unique method for tracing the formation and evolution of their host galaxies. As single stellar populations they are far easier to interpret than the multi-population complexity of galaxy field stars. The scaling properties of globular clusters provide important constraints on the hierarchical assembly history of galaxies. Here we briefly review recent progress using the Hubble Space Telescope for imaging and the Keck plus Gemini telescopes for spectroscopy. We argue that the red, or metal-rich, subpopulation of GCs is associated with the bulge/spheroid component of galaxies. As one of the oldest stellar systems available for study, we discuss how globular clusters can be used to constrain the formation of galaxy bulges, in particular the role of mergers vs secular evolution. We conclude that metal-rich GCs, and hence bulges, formed very early in the Universe with more recent mergers having a small effect at most.

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Designing Hierarchical Assembly of Carbon-Coated TiO2 Nanocrystals and Unraveling the Role of TiO2/Carbon Interface in Lithium-Ion Storage in TiO2

ACS Applied Materials & Interfaces ◽

10.1021/acsami.8b21705 ◽

2019 ◽

Vol 11 (12) ◽

pp. 11391-11402 ◽

Cited By ~ 15

Author(s):

Je Uk Ha ◽

Jeongmin Lee ◽

Muhammad A. Abbas ◽

Moo Dong Lee ◽

Junghyun Lee ◽

...

Keyword(s):

Lithium Ion ◽

Tio2 Nanocrystals ◽

Hierarchical Assembly ◽

Ion Storage ◽

Carbon Coated

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On the Role of Graph Theory Apparatus in a CAD Modeling Kernel

10.51130/graphicon-2020-2-3-70 ◽

2020 ◽

pp. paper70-1-paper70-18

Author(s):

Sergey Slyadnev ◽

Alexander Malyshev ◽

Andrey Voevodin ◽

Vadim Turlapov

Keyword(s):

Graph Theory ◽

Feature Recognition ◽

Expressive Power ◽

Industrial Applications ◽

Connected Components ◽

Flat Plates ◽

Adjacency Graph ◽

Cad Modeling ◽

Hierarchical Assembly

This paper summarizes the experience of authors in solving a broad range of CAD modeling problems where the formalism of graph theory demonstrates its expressive power. Some results reported in this paper have never been published elsewhere. The set of topological and geometric heuristics backing the subgraph isomorphism algorithm is presented to achieve decent performance in our extensible feature recognition framework. By the example of sheet metal features, we show that using wise topological and geometric heuristics speeds up the search process up to interactive performance rates. For detecting CAD part’s type, we present the connected components’ analysis in the attributed adjacency graph. Our approach allows for identifying two-sided CAD parts, such as sheet metals, tubes, and flat plates. We use the notion of face transition graph for the unfoldability analysis. The basic operations on hierarchical assembly graphs are formalized in terms of graph theory for handling CAD assemblies. We describe instance singling operation that allows for addressing unique part’s occurrences in the component tree of an assembly. The presented algorithms and ideas demonstrated their efficiency and accuracy in the bunch of industrial applications developed by our team.

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