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Blumberg. G. Liu, R. Klein, M.V. Lee, W.C. Ginsberg, D.M. Gu, C. Veal, B.W. Dabrowski, B. 숙명여자대학교 자연과학연구소 1994 자연과학논문집 Vol.- No.5
We report observation and resonance Raman studies of spin-pair excitations in YBa₂Cu₃O6+n (0.37<x<0.7) and YBa₂Cu₃O6 superconductors. These excitations at energy ∼3J(2700±150cm-1), similar to two-magnon excitations in insulators, are evidence that antiferromagnetic fluctuations with spatial extent of at least three lattice constants are not overdamped in the underdoped superconductors. With optimal hole doping, where Tc>80 K, the two-magnon peak can no longer be seen above the flat Raman continuum. Photoluminescence and the orgin of the broad-spectrum Raman continuum are also discussed.
Blumberg. G.,Liu, R.,Klein, M.V.,Lee, W.C.,Ginsberg, D.M.,Gu, C.,Veal, B.W.,Dabrowski, B. 숙명여자대학교 자연과학연구소 1994 자연과학논문집 Vol.- No.5
We report observation and resonance Raman studies of spin-pair excitations in YBa₂Cu₃O6+n (0.37<x<0.7) and YBa₂Cu₃O6 superconductors. These excitations at energy ∼3J(2700±150cm-1), similar to two-magnon excitations in insulators, are evidence that antiferromagnetic fluctuations with spatial extent of at least three lattice constants are not overdamped in the underdoped superconductors. With optimal hole doping, where Tc>80 K, the two-magnon peak can no longer be seen above the flat Raman continuum. Photoluminescence and the orgin of the broad-spectrum Raman continuum are also discussed.
Electronic Raman scattering in cuprate superconductors and parent insulating phases
Klein, M.V.,Salamon, D.,Blumberg, G.,Cooper, S.L.,Ginsberg, D.M.,Liu, R.,Reznik, D.,Lee, W.C. 숙명여자대학교 자연과학연구소 1994 자연과학논문집 Vol.- No.5
Raman scattering from charge and spin excitations in cuprates is reviewed. The two-magnon resonance Raman profile is used to determine the most probable energy for photon-assisted charge transfer leading to exchange between two spins. The difference between this energy and that for absorption is attributed to spin relaxation (spin polaron) effects. Two-magnon spectra in superconducting cuprates are presented. It is argued that their presence is evidence that the antiferromagnetic correlation length is equal to or greater than three lattice constants. The recently-discovered Raman-active excitons are described and possible assignments of them are discussed. It is pointed out that in highly correlated metals and insulators, the mechanisms for light scattering that are familiar for doped semiconductors or conventional metals are not necessarily the only ones that are operative.
Electronic Raman scattering in cuprate superconductors and parent insulating phases
Klein, M.V.,Salamon, D.,Blumberg, G.,Cooper, S.L.,Ginsberg, D.M.,Liu, R.,Reznik, D.,Lee, W.C. 숙명여자대학교 자연과학연구소 1994 자연과학논문집 Vol.- No.5
Raman scattering from charge and spin excitations in cuprates is reviewed. The two-magnon resonance Raman profile is used to determine the most probable energy for photon-assisted charge transfer leading to exchange between two spins. The difference between this energy and that for absorption is attributed to spin relaxation (spin polaron) effects. Two-magnon spectra in superconducting cuprates are presented. It is argued that their presence is evidence that the antiferromagnetic correlation length is equal to or greater than three lattice constants. The recently-discovered Raman-active excitons are described and possible assignments of them are discussed. It is pointed out that in highly correlated metals and insulators, the mechanisms for light scattering that are familiar for doped semiconductors or conventional metals are not necessarily the only ones that are operative.
Characterization of AJH-836, a diacylglycerol-lactone with selectivity for novel PKC isozymes
Cooke, Mariana,Zhou, Xiaoling,Casado-Medrano, Victoria,Lopez-Haber, Cynthia,Baker, Martin J.,Garg, Rachana,Ann, Jihyae,Lee, Jeewoo,Blumberg, Peter M.,Kazanietz, Marcelo G. American Society for Biochemistry and Molecular Bi 2018 The Journal of biological chemistry Vol.293 No.22
<P>Diacylglycerol (DAG) is a key lipid second messenger downstream of cellular receptors that binds to the C1 domain in many regulatory proteins. Protein kinase C (PKC) isoforms constitute the most prominent family of signaling proteins with DAG-responsive C1 domains, but six other families of proteins, including the chimaerins, Ras-guanyl nucleotide-releasing proteins (RasGRPs), and Munc13 isoforms, also play important roles. Their significant involvement in cancer, immunology, and neurobiology has driven intense interest in the C1 domain as a therapeutic target. As with other classes of targets, however, a key issue is the establishment of selectivity. Here, using [H-3]phorbol 12,13-dibutyrate ([H-3]PDBu) competition binding assays, we found that a synthetic DAG-lactone, AJH-836, preferentially binds to the novel PKC isoforms PKC and PKCE relative to classical PKC and PKCII. Assessment of intracellular translocation, a hallmark for PKC activation, revealed that AJH-836 treatment stimulated a striking preferential redistribution of PKCE to the plasma membrane relative to PKC. Moreover, unlike with the prototypical phorbol ester phorbol 12-myristate 13-acetate (PMA), prolonged exposure of cells to AJH-836 selectively down-regulated PKC and PKCE without affecting PKC expression levels. Biologically, AJH-836 induced major changes in cytoskeletal reorganization in lung cancer cells, as determined by the formation of membrane ruffles, via activation of novel PKCs. We conclude that AJH-836 represents a C1 domain ligand with PKC-activating properties distinct from those of natural DAGs and phorbol esters. Our study supports the feasibility of generating selective C1 domain ligands that promote novel biological response patterns.</P>