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  • 11
    Publication Date: 2015-12-03
    Description: Author(s): Chi-Cheng Lee, Su-Yang Xu, Shin-Ming Huang, Daniel S. Sanchez, Ilya Belopolski, Guoqing Chang, Guang Bian, Nasser Alidoust, Hao Zheng, Madhab Neupane, Baokai Wang, Arun Bansil, M. Zahid Hasan, and Hsin Lin The family of binary compounds including TaAs, TaP, NbAs, and NbP was recently discovered as the first realization of Weyl semimetals. In order to develop a comprehensive description of the charge carriers in these Weyl semimetals, we performed detailed and systematic electronic band structure calcu… [Phys. Rev. B 92, 235104] Published Tue Dec 01, 2015
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 12
    Publication Date: 2012-05-08
    Description: Author(s): J. Sánchez-Barriga, J. Braun, J. Minár, I. Di Marco, A. Varykhalov, O. Rader, V. Boni, V. Bellini, F. Manghi, H. Ebert, M. I. Katsnelson, A. I. Lichtenstein, O. Eriksson, W. Eberhardt, H. A. Dürr, and J. Fink We have investigated the spin-dependent quasiparticle lifetimes and the strength of electron correlation effects in the ferromagnetic 3 d transition metals Fe, Co, and Ni by means of spin- and angle-resolved photoemission spectroscopy. The experimental data are accompanied by state-of-the-art many-bo... [Phys. Rev. B 85, 205109] Published Mon May 07, 2012
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 13
    Publication Date: 2014-06-19
    Description: Author(s): Ana Díaz-Rubio, Daniel Torrent, Jorge Carbonell, and José Sánchez-Dehesa The absorption of electromagnetic waves by a thin dielectric slab backed by a metasurface has been comprehensively studied and discussed at microwave frequencies. The metasurface consists of a metallic plate decorated with a periodic distribution of coaxial- or annular-type cavities. Analytical expr... [Phys. Rev. B 89, 245123] Published Wed Jun 18, 2014
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 14
    Publication Date: 2014-04-16
    Description: Author(s): Jorge Carbonell, Francisco J. Rodríguez-Fortuño, Ana Díaz-Rubio, Alejandro Martínez, Francisco Cervera, and José Sánchez-Dehesa Experimental evidence is reported on the control of the directionality of guided electromagnetic microwaves by the polarization of the exciting wave. Experiments are conducted using a two-dimensional waveguide made of two parallel aluminum plates. The upper plate, which has a linear array of holes, ... [Phys. Rev. B 89, 155121] Published Tue Apr 15, 2014
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
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  • 15
    Publication Date: 2013-07-26
    Description: Author(s): Rosa López and David Sánchez We investigate nonlinear heat properties in mesoscopic conductors using a scattering theory of transport. Our approach is based on a leading-order expansion in both the electrical and thermal driving forces. Beyond linear response, the transport coefficients are functions of the nonequilibrium scree... [Phys. Rev. B 88, 045129] Published Thu Jul 25, 2013
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 16
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1997-10-06
    Description: The inhibitory gamma-aminobutyric acid-containing (GABAergic) neurons of the thalamic reticular and perigeniculate nuclei are involved in the generation of normal and abnormal synchronized activity in thalamocortical networks. An important factor controlling the generation of activity in this system is the amplitude and duration of inhibitory postsynaptic potentials (IPSPs) in thalamocortical cells, which depend on the pattern of activity generated in thalamic reticular and perigeniculate cells. Activation of single ferret perigeniculate neurons generated three distinct patterns of GABAergic IPSPs in thalamocortical neurons of the dorsal lateral geniculate nucleus: Low-frequency tonic discharge resulted in small-amplitude IPSPs mediated by GABAA receptors, burst firing resulted in large-amplitude GABAA IPSPs, and prolonged burst firing activated IPSPs mediated by GABAA and GABAB receptors. These functional properties of GABAergic inhibition can reconfigure the operations of thalamocortical networks into patterns of activity associated with waking, slow-wave sleep, and generalized seizures.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kim, U -- Sanchez-Vives, M V -- McCormick, D A -- New York, N.Y. -- Science. 1997 Oct 3;278(5335):130-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Section of Neurobiology, Yale University School of Medicine, New Haven, CT 06510, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9311919" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Animals ; Bicuculline/analogs & derivatives/pharmacology ; Dendrites/physiology/ultrastructure ; Ferrets ; GABA Agonists/pharmacology ; GABA Antagonists/pharmacology ; Geniculate Bodies/cytology/physiology ; Glutamic Acid/pharmacology ; In Vitro Techniques ; Lysine/analogs & derivatives/pharmacology ; Neurons/*physiology/ultrastructure ; Organophosphorus Compounds/pharmacology ; Patch-Clamp Techniques ; Presynaptic Terminals/ultrastructure ; Receptors, GABA-A/*physiology ; Receptors, GABA-B/*physiology ; *Synaptic Transmission ; Thalamic Nuclei/cytology/*physiology ; gamma-Aminobutyric Acid/pharmacology/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 17
    Publication Date: 1997-09-05
    Description: In response to DNA damage, mammalian cells prevent cell cycle progression through the control of critical cell cycle regulators. A human gene was identified that encodes the protein Chk1, a homolog of the Schizosaccharomyces pombe Chk1 protein kinase, which is required for the DNA damage checkpoint. Human Chk1 protein was modified in response to DNA damage. In vitro Chk1 bound to and phosphorylated the dual-specificity protein phosphatases Cdc25A, Cdc25B, and Cdc25C, which control cell cycle transitions by dephosphorylating cyclin-dependent kinases. Chk1 phosphorylates Cdc25C on serine-216. As shown in an accompanying paper by Peng et al. in this issue, serine-216 phosphorylation creates a binding site for 14-3-3 protein and inhibits function of the phosphatase. These results suggest a model whereby in response to DNA damage, Chk1 phosphorylates and inhibits Cdc25C, thus preventing activation of the Cdc2-cyclin B complex and mitotic entry.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sanchez, Y -- Wong, C -- Thoma, R S -- Richman, R -- Wu, Z -- Piwnica-Worms, H -- Elledge, S J -- GM17763/GM/NIGMS NIH HHS/ -- GM44664/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1997 Sep 5;277(5331):1497-501.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Verna and Marrs McLean Department of Biochemistry, Howard Hughes Medical Institute, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9278511" target="_blank"〉PubMed〈/a〉
    Keywords: 14-3-3 Proteins ; Amino Acid Sequence ; Animals ; CDC2 Protein Kinase/*metabolism ; Cell Cycle Proteins/antagonists & inhibitors/*metabolism ; Chromosome Mapping ; Chromosomes, Human, Pair 11 ; Cytoskeletal Proteins ; *DNA Damage ; *F-Box Proteins ; G2 Phase ; HeLa Cells ; Humans ; Mice ; *Mitosis ; Molecular Sequence Data ; Phosphoprotein Phosphatases/metabolism ; Phosphorylation ; Phosphoserine/metabolism ; Protein Kinases/chemistry/genetics/*metabolism ; Protein Tyrosine Phosphatases/metabolism ; Proteins/metabolism ; Recombinant Fusion Proteins/metabolism ; Schizosaccharomyces pombe Proteins ; Signal Transduction ; Transfection ; *Tyrosine 3-Monooxygenase ; *Ubiquitin-Protein Ligases ; *cdc25 Phosphatases
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 18
    Publication Date: 2010-06-29
    Description: The accumulation of species-specific enemies around adults is hypothesized to maintain plant diversity by limiting the recruitment of conspecific seedlings relative to heterospecific seedlings. Although previous studies in forested ecosystems have documented patterns consistent with the process of negative feedback, these studies are unable to address which classes of enemies (for example, pathogens, invertebrates, mammals) exhibit species-specific effects strong enough to generate negative feedback, and whether negative feedback at the level of the individual tree is sufficient to influence community-wide forest composition. Here we use fully reciprocal shade-house and field experiments to test whether the performance of conspecific tree seedlings (relative to heterospecific seedlings) is reduced when grown in the presence of enemies associated with adult trees. Both experiments provide strong evidence for negative plant-soil feedback mediated by soil biota. In contrast, above-ground enemies (mammals, foliar herbivores and foliar pathogens) contributed little to negative feedback observed in the field. In both experiments, we found that tree species that showed stronger negative feedback were less common as adults in the forest community, indicating that susceptibility to soil biota may determine species relative abundance in these tropical forests. Finally, our simulation models confirm that the strength of local negative feedback that we measured is sufficient to produce the observed community-wide patterns in tree-species relative abundance. Our findings indicate that plant-soil feedback is an important mechanism that can maintain species diversity and explain patterns of tree-species relative abundance in tropical forests.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mangan, Scott A -- Schnitzer, Stefan A -- Herre, Edward A -- Mack, Keenan M L -- Valencia, Mariana C -- Sanchez, Evelyn I -- Bever, James D -- R01 GM092660/GM/NIGMS NIH HHS/ -- England -- Nature. 2010 Aug 5;466(7307):752-5. doi: 10.1038/nature09273.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Sciences, University of Wisconsin-Milwaukee, Wisconsin 53201, USA. smangan37@gmail.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20581819" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biodiversity ; Biomass ; Computer Simulation ; Feedback, Physiological ; Food Chain ; Insects/physiology ; Models, Biological ; Panama ; Population Density ; Seedlings/growth & development ; Soil/*analysis ; *Soil Microbiology ; Species Specificity ; Trees/*classification/*growth & development/microbiology/parasitology ; *Tropical Climate ; Vertebrates/physiology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 19
    Publication Date: 2018-12-06
    Description: Author(s): J. Sánchez-Barriga, I. Aguilera, L. V. Yashina, D. Y. Tsukanova, F. Freyse, A. N. Chaika, C. Callaert, A. M. Abakumov, J. Hadermann, A. Varykhalov, E. D. L. Rienks, G. Bihlmayer, S. Blügel, and O. Rader The authors investigate the electronic and spin structure of topological surface states across a topological quantum phase transition. They find a surface band gap opening at the Dirac point of the topological surface states, giving rise to massive fermions with nonzero spin polarization on both sides of the phase transition. A mechanism of bulk-mediated scattering processes that increase with decreasing spin-orbit coupling strength is proposed as an explanation for the problem of the unconventional transformation between spin Dirac phases. [Phys. Rev. B 98, 235110] Published Wed Dec 05, 2018
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 20
    Publication Date: 2018-09-20
    Description: Author(s): F. Freyse, M. Battiato, L. V. Yashina, and J. Sánchez-Barriga Ultrafast dynamics in three-dimensional topological insulators (TIs) opens new routes for increasing the speed of information transport up to frequencies a thousand times faster than in modern electronics. However, to date, disentangling the exact contributions from bulk and surface transport to the... [Phys. Rev. B 98, 115132] Published Wed Sep 19, 2018
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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