Results 101 to 110 of about 394,492 (288)

Magnetic excitation spectrum of dimerized antiferromagnetic chains

, 1996
Motivated by recent measurements on CuGeO$_3$ the spectrum of magnetic excitations of an antiferromagnetic $S=\frac{1}{2}$ chain with alternating coupling strength is investigated.
A. B. Harris, A. Luther, A. M. Tsvelik, F. D. M. Haldane, F. D. M. Haldane, G. Castilla, G. Müller, G. Spronken, Götz S. Uhrig, H. A. Bethe, H. Bergknoff, H. J. Schulz, H. J. Schulz, I. Affleck, J. C. Bonner, J. P. Pouget, J. Riera, K. Hirota, L. D. Faddeev, L. P. Regnault, M. C. Cross, M. C. Martin, M. Hase, M. Nishi, P. Fulde, P. Jordan, R. Chitra, S. Haas, Z. G. Soos   +28 more
core   +1 more source

AAA+ protein unfoldases—the Moirai of the proteome

FEBS Letters, EarlyView.
AAA+ unfoldases are essential molecular motors that power protein degradation and disaggregation. This review integrates recent cryo‐electron microscopy (cryo‐EM) structures and single‐molecule biophysical data to reconcile competing models of substrate translocation.
Stavros Azinas, Marta Carroni
wiley   +1 more source

Critical states embedded in the continuum

New Journal of Physics, 2015
We introduce a class of critical states which are embedded in the continuum (CSC) of a one-dimensional optical waveguide array with one non-Hermitian defect. These states are on the verge of being fractal and have real propagation constants.
M Koirala, A Yamilov, A Basiri, Y Bromberg, H Cao, T Kottos   +5 more
doaj   +1 more source

Demonstration of on-chip gigahertz acousto-optic modulation at near-visible wavelengths

Nanophotonics, 2021
Lithium niobate integrated photonics has recently received significant attention because it exploits the attractive properties of lithium niobate on an integrated platform which provides strong optical confinement as well as high photonic integration ...
Yu Yue, Wang Lai, Sun Xiankai
doaj   +1 more source

Ultrahigh Q-Guided Resonance Sensor Empowered by Near Merging Bound States in the Continuum

Photonics, 2022
Bound states in the continuum (BICs) have attracted a lot of interest in the field of nanophotonics, and provide an important physical mechanism to realize high quality (Q) factor resonance.
Zhiran Liu, Yi Zhou, Zhihe Guo, Xuyang Zhao, Man Luo, Yuxiang Li, Xiang Wu   +6 more
doaj   +1 more source

The Absence of Positive Energy Bound States for a Class of Nonlocal Potentials

, 2004
We generalize in this paper a theorem of Titchmarsh for the positivity of Fourier sine integrals. We apply then the theorem to derive simple conditions for the absence of positive energy bound states (bound states embedded in the continuum) for the ...
Chadan K, Erdélyi A, Erdélyi A, Galindo A, Gourdin M, Khosrow Chadan, Newton R G, Reido Kobayashi, Royden H L, Simon B, Sneddon I N, Titchmarch E C, Titchmarsh E C, Valiron G, Zirilli F   +14 more
core   +2 more sources

Transcriptional network analysis of PTEN‐protein‐deficient prostate tumors reveals robust stromal reprogramming and signs of senescent paracrine communication

Molecular Oncology, EarlyView.
Combining PTEN protein assessment and transcriptomic profiling of prostate tumors, we uncovered a network enriched in senescence and extracellular matrix (ECM) programs associated with PTEN loss and conserved in a mouse model. We show that PTEN‐deficient cells trigger paracrine remodeling of the surrounding stroma and this information could help ...
Ivana Rondon‐Lorefice, Jose I. Lopez, Aitziber Ugalde‐Olano, Maite Zufiaurre, Ianire Astobiza, Natalia Martin‐Martin, Laura Bozal‐Basterra, Saioa Garcia‐Longarte, Amaia Zabala‐Letona, Sofia Rey, Aida Santos‐Martin, Miguel Unda, Ana Loizaga‐Iriarte, Mariona Graupera, Paolo Nuciforo, Arkaitz Carracedo, Isabel Mendizabal   +16 more
wiley   +1 more source

Achieving asymmetry parameter-insensitive resonant modes through relative shift–induced quasi-bound states in the continuum

Nanophotonics
High-Q resonances in metasurfaces, stemming from symmetry-protected bound states in the continuum (BICs), have proven to be effective for achieving high-performance optical devices.
Sang Tian, Mi Qing, Yang Chaoyu, Zhang Xianghu, Wang Yueke, Ren Yongze, Xu Ting   +6 more
doaj   +1 more source

Break-up and electromagnetic response of light weakly-bound dicluster systems

, 2002
This study is focused on the break-up and electromagnetic response of light weakly-bound dicluster nuclei. The cluster picture in the case of $ ^7$Li is shown to be a very good approximation and in this framework we calculate nuclear structure ...
Fortunato, Lorenzo
core   +1 more source

Tumour–host interactions in Drosophila: mechanisms in the tumour micro‐ and macroenvironment

Molecular Oncology, EarlyView.
This review examines how tumour–host crosstalk takes place at multiple levels of biological organisation, from local cell competition and immune crosstalk to organism‐wide metabolic and physiological collapse. Here, we integrate findings from Drosophila melanogaster studies that reveal conserved mechanisms through which tumours hijack host systems to ...
José Teles‐Reis, Tor Erik Rusten
wiley   +1 more source