scholarly journals Single-particle and Fermi-liquid properties of3He−4Hemixtures: A microscopic analysis

1998 ◽  
Vol 58 (18) ◽  
pp. 12282-12299 ◽  
Author(s):  
E. Krotscheck ◽  
J. Paaso ◽  
M. Saarela ◽  
K. Schörkhuber ◽  
R. Zillich
Keyword(s):  
Single Particle ◽  
Fermi Liquid ◽  
Microscopic Analysis

scholarly journals Recent Advances in Single-Particle Electron Microscopic Analysis of Autophagy Degradation Machinery

2020 ◽  
Vol 21 (21) ◽  
pp. 8051
Author(s):  
Yiu Wing Sunny Cheung ◽  
Sung-Eun Nam ◽  
Calvin K. Yip
Keyword(s):  
Single Particle ◽  
Membrane Vesicle ◽  
Microscopic Analysis ◽  
Degradation Process ◽  
Electron Microscopic ◽  
Major Pathway ◽  
Selective Autophagy ◽  
Selective Degradation ◽  
The Core ◽  
Atg Proteins

Macroautophagy (also known as autophagy) is a major pathway for selective degradation of misfolded/aggregated proteins and damaged organelles and non-selective degradation of cytoplasmic constituents for the generation of power during nutrient deprivation. The multi-step degradation process, from sequestering cytoplasmic cargo into the double-membrane vesicle termed autophagosome to the delivery of the autophagosome to the lysosome or lytic vacuole for breakdown, is mediated by the core autophagy machinery composed of multiple Atg proteins, as well as the divergent sequence family of selective autophagy receptors. Single-particle electron microscopy (EM) is a molecular imaging approach that has become an increasingly important tool in the structural characterization of proteins and macromolecular complexes. This article summarizes the contributions single-particle EM have made in advancing our understanding of the core autophagy machinery and selective autophagy receptors. We also discuss current technical challenges and roadblocks, as well as look into the future of single-particle EM in autophagy research.

scholarly journals Merging of single-particle levels and non-Fermi-liquid behavior of finite Fermi systems

2008 ◽  
Vol 403 (5-9) ◽  
pp. 1257-1259
Author(s):  
V.A. Khodel ◽  
J.W. Clark ◽  
Haochen Li ◽  
M.V. Zverev
Keyword(s):  
Single Particle ◽  
Fermi Liquid ◽  
Fermi Systems ◽  
Liquid Behavior ◽  
Fermi Liquid Behavior

PAIRING IN NON-FERMI LIQUID IN TERMS OF THE BETHE-SALPETER EQUATION

2007 ◽  
Vol 21 (18n19) ◽  
pp. 3122-3131 ◽  
Author(s):  
Y. M. Malozovsky ◽  
J. D. Fan
Keyword(s):  
Green’S Function ◽  
Green's Function ◽  
Single Particle ◽  
Fermi Liquid ◽  
Luttinger Liquid ◽  
Fermi System ◽  
Spectral Weight ◽  
Fermi Distribution ◽  
Marginal Fermi Liquid ◽  
Fermi Type

Pairing between two fermionic excitations in a non-Fermi liquid is considered in terms of the Bethe-Salpeter equation. We consider the pairing in a Fermi system with vanishing spectral weight. It is well known that the quasiparticle pole in the single-particle Green's function in a Non-Fermi liquid is absent or weak. The examples of such systems can be viewed as the "Marginal" Fermi liquid and Luttinger liquid. Another example that has also been considered is the Fermi system with pseudogap behavior in the spectral weight. Although the pairing between two excitations in a non-Fermi liquid is, in general, absent, nevertheless we show that the Cooper's type of pairing can occur and the conditions for such a kind of pairing are discussed. The results have also been applied to the systems with smeared or non-monotonic Fermi distribution. A system that transits from Fermi-type to Bose-type behavior can serve as an example of such systems as discussed.

Two Fluid superconductors

1989 ◽  
Vol 169 ◽  
Author(s):  
Y. Bar-Yam
Keyword(s):  
Copper Oxide ◽  
Single Particle ◽  
Fermi Liquid ◽  
Oxygen Vacancies ◽  
Eutectic Alloys ◽  
Fermi Liquid Theory ◽  
Liquid Theory ◽  
Boson Model ◽  
Virtual Excitation ◽  
Two Fluid

AbstractAn approach to the theory of high‐Tc superconductivity is discused in which the semiconductor‐like layers between the copper‐oxide planes are more active participants in the superconductivity. Two types of states appear in the theory, a lattice of negative‐U sites and single particle (positive‐U) dispersive states. The negative‐U sites originate in oxygen vacancies and the single particle states in the copper‐oxide planes. The coupling between these two types of states lead to a two‐fluid superconductivity where the negative‐U sites give rise to a charged Bosonic fluid and the single particle states are a Cooper‐paired superconductor. The coupled Fermion‐Boson model for superconductivity is related both to theories of superconductivity in semiconductor‐metal eutectic alloys, and recent suggestions of s‐channel superconductivity of R. Freidberg and T. D. Lee. Basic aspects of general phenomenology are described. The breakdown of Fermi liquid theory in the normal state results from mixing of Fermions and Bosons at the Fermi energy. When the two‐particle states are filled, anti‐ferromagnetism arises from the positive‐U of the single particle states with a contribution from virtual excitation of two‐particle states. Prediction is made of a large class of superconducting materials based on metal‐semiconductor layering.

Combinatorial Single Particle Spectro-Microscopic Analysis of Plasmon Coupling of Gold Nanorods on Mirror

2021 ◽  
Author(s):  
Seth L. Filbrun ◽  
Teng-Xiang Huang ◽  
Fei Zhao ◽  
Kuangcai Chen ◽  
Bin Dong ◽  
...  
Keyword(s):  
Gold Nanorods ◽  
Single Particle ◽  
Microscopic Analysis ◽  
Plasmon Coupling

scholarly journals Non-Fermi-Liquid Single Particle Line Shape of the Quasi-One-Dimensional Non-CDW MetalLi0.9Mo6O17: Comparison to the Luttinger Liquid

1999 ◽  
Vol 82 (12) ◽  
pp. 2540-2543 ◽  
Author(s):  
J. D. Denlinger ◽  
G.-H. Gweon ◽  
J. W. Allen ◽  
C. G. Olson ◽  
J. Marcus ◽  
...  
Keyword(s):  
Single Particle ◽  
Line Shape ◽  
Fermi Liquid ◽  
Luttinger Liquid ◽  
One Dimensional

Localization of immunolabels by electron microscopy and image averaging

1983 ◽  
Vol 41 ◽  
pp. 282-283
Author(s):  
J. Frank ◽  
P.-Y. Sizaret ◽  
A. Verschoor ◽  
J. Lamy
Keyword(s):  
Electron Microscopy ◽  
Single Particle ◽  
Attachment Site ◽  
Uranyl Acetate ◽  
Limulus Polyphemus ◽  
Resolution Limit ◽  
Electron Microscopic ◽  
Image Averaging ◽  
Top View ◽  
Better Than

The accuracy with which the attachment site of immunolabels bound to macromolecules may be localized in electron microscopic images can be considerably improved by using single particle averaging. The example studied in this work showed that the accuracy may be better than the resolution limit imposed by negative staining (∽2nm).The structure used for this demonstration was a halfmolecule of Limulus polyphemus (LP) hemocyanin, consisting of 24 subunits grouped into four hexamers. The top view of this structure was previously studied by image averaging and correspondence analysis. It was found to vary according to the flip or flop position of the molecule, and to the stain imbalance between diagonally opposed hexamers (“rocking effect”). These findings have recently been incorporated into a model of the full 8 × 6 molecule.LP hemocyanin contains eight different polypeptides, and antibodies specific for one, LP II, were used. Uranyl acetate was used as stain. A total of 58 molecule images (29 unlabelled, 29 labelled with antl-LPII Fab) showing the top view were digitized in the microdensitometer with a sampling distance of 50μ corresponding to 6.25nm.

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