Two-magnon spectra and Ising anisotropy: The relationship between resonances and bound states

1976 ◽  
Vol 13 (9) ◽  
pp. 4019-4028 ◽  
Author(s):  
P. D. Loly ◽  
B. J. Choudhury
Keyword(s):  
Bound States ◽  
The Relationship

scholarly journals Quantum speedup, non-Markovianity and formation of bound state

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Bahram Ahansaz ◽  
Abbas Ektesabi
Keyword(s):  
Bound States ◽  
Decisive Role ◽  
Bound State ◽  
Negative Energy ◽  
Quantum Evolution ◽  
Level System ◽  
System Environment ◽  
Speed Up ◽  
The Relationship ◽  
Quantum Speedup

Abstract In this paper, we investigate the relationship between the quantum speedup, non-Markovianity and formation of a system-environment bound state. Previous results show a monotonic relation between these three such that providing bound states with more negative energy can lead to a higher degree of non-Markovianity, and hence to a greater speed of quantum evolution. By studying dynamics of a dissipative two-level system or a V-type three-level system, when similar and additional systems are present, we reveal that the quantum speedup is exclusively related to the formation of the system-environment bound state, while the non-Markovian effect of the system dynamics is neither necessary nor sufficient to speed up the quantum evolution. On the other hand, it is shown that only the formation of the system-environment bound state plays a decisive role in the acceleration of the quantum evolution.

scholarly journals STRONG–WEAK COUPLING DUALITY IN FOUR-DIMENSIONAL STRING THEORY

1994 ◽  
Vol 09 (21) ◽  
pp. 3707-3750 ◽  
Author(s):  
ASHOKE SEN
Keyword(s):  
String Theory ◽  
Weak Coupling ◽  
Bound States ◽  
Target Space ◽  
Duality Transformation ◽  
Heterotic String Theory ◽  
Yukawa Couplings ◽  
Duality Symmetry ◽  
The Relationship ◽  
Electrically Charged

We present several pieces of evidence for strong–weak coupling duality symmetry in the heterotic string theory, compactified on a six-dimensional torus. They include symmetry of the (1) low energy effective action, (2) allowed spectrum of electric and magnetic charges in the theory, (3) allowed mass spectrum of particles saturating the Bogomol'nyi bound, and (4) Yukawa couplings between massless neutral particles and massive charged particles saturating the Bogomol'nyi bound. This duality transformation exchanges the electrically charged elementary string excitations with the magnetically charged soliton states in the theory. It is shown that the existence of a strong–weak coupling duality symmetry in four-dimensional string theory makes definite predictions about the existence of new stable monopole and dyon states in the theory with specific degeneracies, including certain supersymmetric bound states of monopoles and dyons. The relationship between strong–weak coupling duality transformation in string theory and target space duality transformation in the five-brane theory is also discussed.

scholarly journals ON THE NUMBER OF METASTABLE STATES IN A STRIPE GLASS

2001 ◽  
Vol 15 (24n25) ◽  
pp. 3292-3295 ◽  
Author(s):  
JÖRG SCHMALIAN ◽  
HARRY WESTFAHL ◽  
PETER G. WOLYNES
Keyword(s):  
Bound States ◽  
Scaling Laws ◽  
Configurational Entropy ◽  
Metastable States ◽  
Mott Insulators ◽  
Simple Scaling ◽  
The Difference ◽  
The Relationship ◽  
Modulation Length

We estimate the number of metastable states of a self generated stripe glass, relevant for the formation of glassy doped Mott insulators. Using replica bound states, we demonstrate that the configurational entropy is the difference between the entropy of the stripe liquid and of an amorphous stripe solid with phonon-type excitations. Using simple scaling laws we then determine the relationship between the modulation length and the configurational entropy.

Resonances in the dipositronium system: Rydberg states

2010 ◽  
Vol 88 (11) ◽  
pp. 877-883 ◽  
Author(s):  
Joseph DiRienzi ◽  
Richard J. Drachman
Keyword(s):  
Bound States ◽  
Rydberg States ◽  
Charge Conjugation ◽  
The Relationship ◽  
Obvious Extension ◽  
Scattering Resonances

We were previously successful in representing series of Ps + H scattering resonances as mainly due to quasi-bound Rydberg states in either the closed e+ + H– or Ps– + H+ system. An obvious extension would be to investigate the analogous Ps + Ps system, as either e+ + Ps– or e– + Ps+. Here we treat the system in four increasingly complete approximations: with and without including electron and positron symmetry and charge conjugation symmetry. A comparison is made with previous calculations, and in an Appendix the relationship between quasi-bound states and scattering resonances is clarified.

scholarly journals Opening the side exit pores of ClpP by lowering the pH of proteolytic chamber coupled with substrate hydrolysis

2021 ◽  
Author(s):  
Leehyeon Kim ◽  
Byung-Gil Lee ◽  
Min Kyung Kim ◽  
Do Hoon Kwon ◽  
Hyunmin Kim ◽  
...  
Keyword(s):  
Conformational Changes ◽  
Bound States ◽  
Activation Mechanism ◽  
Product Release ◽  
Physiological Processes ◽  
Cryo Electron Microscopy ◽  
Structural Details ◽  
The Relationship ◽  
Small Chemical ◽  
Substrate Hydrolysis

The ClpP serine peptidase is a tetradecameric degradation machine involved in many physiological processes. It becomes a competent ATP-dependent protease with Clp-ATPases. Small chemical compounds, acyldepsipeptides (ADEPs), are known to cause dysregulation and activation of ClpP without ATPases, and have potential as novel antibiotics. Previously, structural studies of ClpP from various species revealed the structural details, conformational changes, and activation mechanism. Although product release by the side exit pores has been proposed, the detailed driving force for product release remains elusive. Here, we report crystal structures of ClpP from Bacillus subtilis (BsClpP) in unforeseen ADEP-bound states. Cryo-electron microscopy structures revealed various conformational states at different pH conditions. To understand the conformational change for product release, we investigated the relationship between substrate hydrolysis and the pH lowering process. Our data, together with previous findings, provide insight into the molecular mechanism of product release by ClpP self-compartmentalizing protease.

scholarly journals Structural and Functional Diversity among Agonist-Bound States of the GLP-1 Receptor

2021 ◽  
Author(s):  
Brian P. Cary ◽  
Peishen Zhao ◽  
Tin T. Truong ◽  
Sarah J. Piper ◽  
Matthew J. Belousoff ◽  
...  
Keyword(s):  
Bound States ◽  
Conformational Dynamics ◽  
Structural Data ◽  
Signal Propagation ◽  
Cryo Electron Microscopy ◽  
Conformational Plasticity ◽  
Glucagon Like Peptide 1 ◽  
Peptide Agonist ◽  
The Relationship ◽  
G Protein Coupled

ABSTRACTRecent advances in G protein-coupled receptor (GPCR) structural elucidation have strengthened previous hypotheses that multi-dimensional signal propagation mediated by these receptors is, in part, dependent on their conformational mobility. However, the relationship between receptor function and static structures determined via crystallography or cryo-electron microscopy is not always clear. This study examines the contribution of peptide agonist conformational plasticity to activation of the glucagon-like peptide-1 receptor (GLP-1R), an important clinical target. We employ variants of the peptides GLP-1 and exendin-4 to explore the interplay between helical propensity near the agonist N-terminus and the ability to bind to and activate the receptor. Cryo-EM analysis of a complex involving an exendin-4 analogue, the GLP-1R and Gs protein revealed two receptor conformers with distinct modes of peptide-receptor engagement. Our functional and structural data suggest that receptor conformational dynamics associated with flexibility of the peptide N-terminal activation domain may be a key determinant of agonist efficacy.

Interstellar gas in the central region of the Galaxy

1967 ◽  
Vol 31 ◽  
pp. 239-251 ◽  
Author(s):  
F. J. Kerr
Keyword(s):  
Central Region ◽  
Galactic Plane ◽  
Neutral Hydrogen ◽  
Continuum Emission ◽  
Galactic Centre ◽  
Interstellar Gas ◽  
Hydrogen Recombination ◽  
The Galaxy ◽  
Centre Region ◽  
The Relationship

A review is given of information on the galactic-centre region obtained from recent observations of the 21-cm line from neutral hydrogen, the 18-cm group of OH lines, a hydrogen recombination line at 6 cm wavelength, and the continuum emission from ionized hydrogen.Both inward and outward motions are important in this region, in addition to rotation. Several types of observation indicate the presence of material in features inclined to the galactic plane. The relationship between the H and OH concentrations is not yet clear, but a rough picture of the central region can be proposed.

The relationship of the scleractinian corals to the rugose corals

Paleobiology ◽  
1980 ◽  
Vol 6 (02) ◽  
pp. 146-160 ◽  
Author(s):  
William A. Oliver
Keyword(s):  
Critical Points ◽  
Scleractinian Corals ◽  
Convincing Evidence ◽  
Early Triassic ◽  
Rugose Corals ◽  
History Of ◽  
The Subject ◽  
Relationship Of ◽  
The Relationship ◽  
Biologic Factors

The Mesozoic-Cenozoic coral Order Scleractinia has been suggested to have originated or evolved (1) by direct descent from the Paleozoic Order Rugosa or (2) by the development of a skeleton in members of one of the anemone groups that probably have existed throughout Phanerozoic time. In spite of much work on the subject, advocates of the direct descent hypothesis have failed to find convincing evidence of this relationship. Critical points are:(1) Rugosan septal insertion is serial; Scleractinian insertion is cyclic; no intermediate stages have been demonstrated. Apparent intermediates are Scleractinia having bilateral cyclic insertion or teratological Rugosa.(2) There is convincing evidence that the skeletons of many Rugosa were calcitic and none are known to be or to have been aragonitic. In contrast, the skeletons of all living Scleractinia are aragonitic and there is evidence that fossil Scleractinia were aragonitic also. The mineralogic difference is almost certainly due to intrinsic biologic factors.(3) No early Triassic corals of either group are known. This fact is not compelling (by itself) but is important in connection with points 1 and 2, because, given direct descent, both changes took place during this only stage in the history of the two groups in which there are no known corals.

Choosing a Markov blanket

2020 ◽  
Vol 43 ◽  
Author(s):  
Thomas Parr
Keyword(s):  
Markov Blanket ◽  
Target Article ◽  
The Relationship

Abstract This commentary focuses upon the relationship between two themes in the target article: the ways in which a Markov blanket may be defined and the role of precision and salience in mediating the interactions between what is internal and external to a system. These each rest upon the different perspectives we might take while “choosing” a Markov blanket.

Tinkering with cognitive gadgets: Cultural evolutionary psychology meets active inference

2019 ◽  
Vol 42 ◽  
Author(s):  
Paul Benjamin Badcock ◽  
Axel Constant ◽  
Maxwell James Désormeau Ramstead
Keyword(s):  
Evolutionary Psychology ◽  
Research Program ◽  
Active Inference ◽  
Innovative Research ◽  
Cognitive Faculties ◽  
Cultural Evolutionary ◽  
The Relationship

Abstract Cognitive Gadgets offers a new, convincing perspective on the origins of our distinctive cognitive faculties, coupled with a clear, innovative research program. Although we broadly endorse Heyes’ ideas, we raise some concerns about her characterisation of evolutionary psychology and the relationship between biology and culture, before discussing the potential fruits of examining cognitive gadgets through the lens of active inference.

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