Search Results - (Author, Cooperation:M. Lara)
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1Li, S., Cai, Z., Zheng, M.-Q., Holden, D., Naganawa, M., Lin, S.-F., Ropchan, J., Labaree, D., Kapinos, M., Lara-Jaime, T., Navarro, A., Huang, Y.
The Society of Nuclear Medicine (SNM)
Published 2018Staff ViewPublication Date: 2018-01-03Publisher: The Society of Nuclear Medicine (SNM)Print ISSN: 0022-3123Topics: MedicinePublished by: -
2J. B. Vincent ; D. Bodewits ; S. Besse ; H. Sierks ; C. Barbieri ; P. Lamy ; R. Rodrigo ; D. Koschny ; H. Rickman ; H. U. Keller ; J. Agarwal ; M. F. A'Hearn ; A. T. Auger ; M. A. Barucci ; J. L. Bertaux ; I. Bertini ; C. Capanna ; G. Cremonese ; V. Da Deppo ; B. Davidsson ; S. Debei ; M. De Cecco ; M. R. El-Maarry ; F. Ferri ; S. Fornasier ; M. Fulle ; R. Gaskell ; L. Giacomini ; O. Groussin ; A. Guilbert-Lepoutre ; P. Gutierrez-Marques ; P. J. Gutierrez ; C. Guttler ; N. Hoekzema ; S. Hofner ; S. F. Hviid ; W. H. Ip ; L. Jorda ; J. Knollenberg ; G. Kovacs ; R. Kramm ; E. Kuhrt ; M. Kuppers ; F. La Forgia ; L. M. Lara ; M. Lazzarin ; V. Lee ; C. Leyrat ; Z. Y. Lin ; J. J. Lopez Moreno ; S. Lowry ; S. Magrin ; L. Maquet ; S. Marchi ; F. Marzari ; M. Massironi ; H. Michalik ; R. Moissl ; S. Mottola ; G. Naletto ; N. Oklay ; M. Pajola ; F. Preusker ; F. Scholten ; N. Thomas ; I. Toth ; C. Tubiana
Nature Publishing Group (NPG)
Published 2015Staff ViewPublication Date: 2015-07-03Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsPublished by: -
3M. Massironi ; E. Simioni ; F. Marzari ; G. Cremonese ; L. Giacomini ; M. Pajola ; L. Jorda ; G. Naletto ; S. Lowry ; M. R. El-Maarry ; F. Preusker ; F. Scholten ; H. Sierks ; C. Barbieri ; P. Lamy ; R. Rodrigo ; D. Koschny ; H. Rickman ; H. U. Keller ; M. F. A'Hearn ; J. Agarwal ; A. T. Auger ; M. A. Barucci ; J. L. Bertaux ; I. Bertini ; S. Besse ; D. Bodewits ; C. Capanna ; V. Da Deppo ; B. Davidsson ; S. Debei ; M. De Cecco ; F. Ferri ; S. Fornasier ; M. Fulle ; R. Gaskell ; O. Groussin ; P. J. Gutierrez ; C. Guttler ; S. F. Hviid ; W. H. Ip ; J. Knollenberg ; G. Kovacs ; R. Kramm ; E. Kuhrt ; M. Kuppers ; F. La Forgia ; L. M. Lara ; M. Lazzarin ; Z. Y. Lin ; J. J. Lopez Moreno ; S. Magrin ; H. Michalik ; S. Mottola ; N. Oklay ; A. Pommerol ; N. Thomas ; C. Tubiana ; J. B. Vincent
Nature Publishing Group (NPG)
Published 2015Staff ViewPublication Date: 2015-09-30Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsPublished by: -
4M. Lara-Tejero ; J. Kato ; S. Wagner ; X. Liu ; J. E. Galan
American Association for the Advancement of Science (AAAS)
Published 2011Staff ViewPublication Date: 2011-02-05Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Amino Acid Sequence ; Antigens, Bacterial/chemistry/metabolism ; Bacterial Proteins/chemistry/*metabolism ; Bacterial Secretion Systems/*physiology ; Cytoplasm/metabolism ; Membrane Proteins/chemistry/*metabolism ; Molecular Chaperones/chemistry/*metabolism ; Molecular Sequence Data ; Multiprotein Complexes/metabolism ; Mutation ; Protein Binding ; Protein Transport ; Salmonella typhimurium/genetics/*metabolism/*pathogenicityPublished by: -
5Staff View
Publication Date: 2018-06-02Publisher: Institute of Physics (IOP)Print ISSN: 1674-1137Topics: PhysicsPublished by: -
6Staff View
Publication Date: 2018-02-12Publisher: Institute of Physics (IOP)Print ISSN: 1674-1137Topics: PhysicsPublished by: -
7Staff View
Publication Date: 2018-07-27Publisher: Institute of Physics (IOP)Print ISSN: 1674-1137Topics: PhysicsPublished by: -
8D. Brawand ; C. E. Wagner ; Y. I. Li ; M. Malinsky ; I. Keller ; S. Fan ; O. Simakov ; A. Y. Ng ; Z. W. Lim ; E. Bezault ; J. Turner-Maier ; J. Johnson ; R. Alcazar ; H. J. Noh ; P. Russell ; B. Aken ; J. Alfoldi ; C. Amemiya ; N. Azzouzi ; J. F. Baroiller ; F. Barloy-Hubler ; A. Berlin ; R. Bloomquist ; K. L. Carleton ; M. A. Conte ; H. D'Cotta ; O. Eshel ; L. Gaffney ; F. Galibert ; H. F. Gante ; S. Gnerre ; L. Greuter ; R. Guyon ; N. S. Haddad ; W. Haerty ; R. M. Harris ; H. A. Hofmann ; T. Hourlier ; G. Hulata ; D. B. Jaffe ; M. Lara ; A. P. Lee ; I. MacCallum ; S. Mwaiko ; M. Nikaido ; H. Nishihara ; C. Ozouf-Costaz ; D. J. Penman ; D. Przybylski ; M. Rakotomanga ; S. C. Renn ; F. J. Ribeiro ; M. Ron ; W. Salzburger ; L. Sanchez-Pulido ; M. E. Santos ; S. Searle ; T. Sharpe ; R. Swofford ; F. J. Tan ; L. Williams ; S. Young ; S. Yin ; N. Okada ; T. D. Kocher ; E. A. Miska ; E. S. Lander ; B. Venkatesh ; R. D. Fernald ; A. Meyer ; C. P. Ponting ; J. T. Streelman ; K. Lindblad-Toh ; O. Seehausen ; F. Di Palma
Nature Publishing Group (NPG)
Published 2014Staff ViewPublication Date: 2014-09-05Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Africa, Eastern ; Animals ; Cichlids/*classification/*genetics ; DNA Transposable Elements/genetics ; *Evolution, Molecular ; Gene Duplication/genetics ; Gene Expression Regulation/genetics ; *Genetic Speciation ; Genome/*genetics ; Genomics ; Lakes ; MicroRNAs/genetics ; Phylogeny ; Polymorphism, Genetic/geneticsPublished by: -
9C. T. Amemiya ; J. Alfoldi ; A. P. Lee ; S. Fan ; H. Philippe ; I. Maccallum ; I. Braasch ; T. Manousaki ; I. Schneider ; N. Rohner ; C. Organ ; D. Chalopin ; J. J. Smith ; M. Robinson ; R. A. Dorrington ; M. Gerdol ; B. Aken ; M. A. Biscotti ; M. Barucca ; D. Baurain ; A. M. Berlin ; G. L. Blatch ; F. Buonocore ; T. Burmester ; M. S. Campbell ; A. Canapa ; J. P. Cannon ; A. Christoffels ; G. De Moro ; A. L. Edkins ; L. Fan ; A. M. Fausto ; N. Feiner ; M. Forconi ; J. Gamieldien ; S. Gnerre ; A. Gnirke ; J. V. Goldstone ; W. Haerty ; M. E. Hahn ; U. Hesse ; S. Hoffmann ; J. Johnson ; S. I. Karchner ; S. Kuraku ; M. Lara ; J. Z. Levin ; G. W. Litman ; E. Mauceli ; T. Miyake ; M. G. Mueller ; D. R. Nelson ; A. Nitsche ; E. Olmo ; T. Ota ; A. Pallavicini ; S. Panji ; B. Picone ; C. P. Ponting ; S. J. Prohaska ; D. Przybylski ; N. R. Saha ; V. Ravi ; F. J. Ribeiro ; T. Sauka-Spengler ; G. Scapigliati ; S. M. Searle ; T. Sharpe ; O. Simakov ; P. F. Stadler ; J. J. Stegeman ; K. Sumiyama ; D. Tabbaa ; H. Tafer ; J. Turner-Maier ; P. van Heusden ; S. White ; L. Williams ; M. Yandell ; H. Brinkmann ; J. N. Volff ; C. J. Tabin ; N. Shubin ; M. Schartl ; D. B. Jaffe ; J. H. Postlethwait ; B. Venkatesh ; F. Di Palma ; E. S. Lander ; A. Meyer ; K. Lindblad-Toh
Nature Publishing Group (NPG)
Published 2013Staff ViewPublication Date: 2013-04-20Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Animals ; Animals, Genetically Modified ; *Biological Evolution ; Chick Embryo ; Conserved Sequence/genetics ; Enhancer Elements, Genetic/genetics ; Evolution, Molecular ; Extremities/anatomy & histology/growth & development ; Fishes/anatomy & histology/*classification/*genetics/physiology ; Genes, Homeobox/genetics ; Genome/*genetics ; Genomics ; Immunoglobulin M/genetics ; Mice ; Molecular Sequence Annotation ; Molecular Sequence Data ; Phylogeny ; Sequence Alignment ; Sequence Analysis, DNA ; Vertebrates/anatomy & histology/genetics/physiologyPublished by: -
10N. Thomas ; H. Sierks ; C. Barbieri ; P. L. Lamy ; R. Rodrigo ; H. Rickman ; D. Koschny ; H. U. Keller ; J. Agarwal ; M. F. A'Hearn ; F. Angrilli ; A. T. Auger ; M. A. Barucci ; J. L. Bertaux ; I. Bertini ; S. Besse ; D. Bodewits ; G. Cremonese ; V. Da Deppo ; B. Davidsson ; M. De Cecco ; S. Debei ; M. R. El-Maarry ; F. Ferri ; S. Fornasier ; M. Fulle ; L. Giacomini ; O. Groussin ; P. J. Gutierrez ; C. Guttler ; S. F. Hviid ; W. H. Ip ; L. Jorda ; J. Knollenberg ; J. R. Kramm ; E. Kuhrt ; M. Kuppers ; F. La Forgia ; L. M. Lara ; M. Lazzarin ; J. J. Lopez Moreno ; S. Magrin ; S. Marchi ; F. Marzari ; M. Massironi ; H. Michalik ; R. Moissl ; S. Mottola ; G. Naletto ; N. Oklay ; M. Pajola ; A. Pommerol ; F. Preusker ; L. Sabau ; F. Scholten ; C. Snodgrass ; C. Tubiana ; J. B. Vincent ; K. P. Wenzel
American Association for the Advancement of Science (AAAS)
Published 2015Staff ViewPublication Date: 2015-01-24Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
11H. Sierks ; C. Barbieri ; P. L. Lamy ; R. Rodrigo ; D. Koschny ; H. Rickman ; H. U. Keller ; J. Agarwal ; M. F. A'Hearn ; F. Angrilli ; A. T. Auger ; M. A. Barucci ; J. L. Bertaux ; I. Bertini ; S. Besse ; D. Bodewits ; C. Capanna ; G. Cremonese ; V. Da Deppo ; B. Davidsson ; S. Debei ; M. De Cecco ; F. Ferri ; S. Fornasier ; M. Fulle ; R. Gaskell ; L. Giacomini ; O. Groussin ; P. Gutierrez-Marques ; P. J. Gutierrez ; C. Guttler ; N. Hoekzema ; S. F. Hviid ; W. H. Ip ; L. Jorda ; J. Knollenberg ; G. Kovacs ; J. R. Kramm ; E. Kuhrt ; M. Kuppers ; F. La Forgia ; L. M. Lara ; M. Lazzarin ; C. Leyrat ; J. J. Lopez Moreno ; S. Magrin ; S. Marchi ; F. Marzari ; M. Massironi ; H. Michalik ; R. Moissl ; S. Mottola ; G. Naletto ; N. Oklay ; M. Pajola ; M. Pertile ; F. Preusker ; L. Sabau ; F. Scholten ; C. Snodgrass ; N. Thomas ; C. Tubiana ; J. B. Vincent ; K. P. Wenzel ; M. Zaccariotto ; M. Patzold
American Association for the Advancement of Science (AAAS)
Published 2015Staff ViewPublication Date: 2015-01-24Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
12J. Alfoldi ; F. Di Palma ; M. Grabherr ; C. Williams ; L. Kong ; E. Mauceli ; P. Russell ; C. B. Lowe ; R. E. Glor ; J. D. Jaffe ; D. A. Ray ; S. Boissinot ; A. M. Shedlock ; C. Botka ; T. A. Castoe ; J. K. Colbourne ; M. K. Fujita ; R. G. Moreno ; B. F. ten Hallers ; D. Haussler ; A. Heger ; D. Heiman ; D. E. Janes ; J. Johnson ; P. J. de Jong ; M. Y. Koriabine ; M. Lara ; P. A. Novick ; C. L. Organ ; S. E. Peach ; S. Poe ; D. D. Pollock ; K. de Queiroz ; T. Sanger ; S. Searle ; J. D. Smith ; Z. Smith ; R. Swofford ; J. Turner-Maier ; J. Wade ; S. Young ; A. Zadissa ; S. V. Edwards ; T. C. Glenn ; C. J. Schneider ; J. B. Losos ; E. S. Lander ; M. Breen ; C. P. Ponting ; K. Lindblad-Toh
Nature Publishing Group (NPG)
Published 2011Staff ViewPublication Date: 2011-09-02Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Animals ; Birds/*genetics ; Chickens/genetics ; *Evolution, Molecular ; GC Rich Sequence/genetics ; Genome/*genetics ; Genomics ; Humans ; Lizards/*genetics ; Mammals/*genetics ; Molecular Sequence Data ; Phylogeny ; Synteny/genetics ; X Chromosome/geneticsPublished by: -
13K. Lindblad-Toh ; M. Garber ; O. Zuk ; M. F. Lin ; B. J. Parker ; S. Washietl ; P. Kheradpour ; J. Ernst ; G. Jordan ; E. Mauceli ; L. D. Ward ; C. B. Lowe ; A. K. Holloway ; M. Clamp ; S. Gnerre ; J. Alfoldi ; K. Beal ; J. Chang ; H. Clawson ; J. Cuff ; F. Di Palma ; S. Fitzgerald ; P. Flicek ; M. Guttman ; M. J. Hubisz ; D. B. Jaffe ; I. Jungreis ; W. J. Kent ; D. Kostka ; M. Lara ; A. L. Martins ; T. Massingham ; I. Moltke ; B. J. Raney ; M. D. Rasmussen ; J. Robinson ; A. Stark ; A. J. Vilella ; J. Wen ; X. Xie ; M. C. Zody ; J. Baldwin ; T. Bloom ; C. W. Chin ; D. Heiman ; R. Nicol ; C. Nusbaum ; S. Young ; J. Wilkinson ; K. C. Worley ; C. L. Kovar ; D. M. Muzny ; R. A. Gibbs ; A. Cree ; H. H. Dihn ; G. Fowler ; S. Jhangiani ; V. Joshi ; S. Lee ; L. R. Lewis ; L. V. Nazareth ; G. Okwuonu ; J. Santibanez ; W. C. Warren ; E. R. Mardis ; G. M. Weinstock ; R. K. Wilson ; K. Delehaunty ; D. Dooling ; C. Fronik ; L. Fulton ; B. Fulton ; T. Graves ; P. Minx ; E. Sodergren ; E. Birney ; E. H. Margulies ; J. Herrero ; E. D. Green ; D. Haussler ; A. Siepel ; N. Goldman ; K. S. Pollard ; J. S. Pedersen ; E. S. Lander ; M. Kellis
Nature Publishing Group (NPG)
Published 2011Staff ViewPublication Date: 2011-10-14Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Animals ; Disease ; *Evolution, Molecular ; Exons/genetics ; Genome/*genetics ; Genome, Human/*genetics ; Genomics ; Health ; Humans ; Mammals/*genetics ; Molecular Sequence Annotation ; Phylogeny ; RNA/classification/genetics ; Selection, Genetic/genetics ; Sequence Alignment ; Sequence Analysis, DNAPublished by: -
14Staff View Fulltext
Publication Date: 2022-05-31Description: The number of referenda taking place in established democracies has been increasing, but oftentimes the use of referenda is controversial. This paper utilises two New Zealand national probability mail surveys collected before (2015; n = 901) and after (2016; n = 1350) the controversial flag change referendums initiated by Prime Minister John Key. We found that support for referenda increased from 54.5% in 2015 to 70.7% in 2016. We examined how demographics, party vote, political attitudes, and support for changing the flag related to change in support for referenda Younger age groups and those with moderate levels of education had larger increases in support for referenda. We did not find any evidence of 'loser effects' as National voters and flag change supporters were just as likely to increase in support for referenda as other voters and those opposing change, respectively. In summary, the results of this paper show that despite controversy, referenda have become more popular, especially among certain groups.Keywords: Politikwissenschaft ; Political science ; political disaffection; flag referendums; ISSP 2015 ; ISSP 2016 ; politische Willensbildung, politische Soziologie, politische Kultur ; Political Process, Elections, Political Sociology, Political Culture ; ISSP ; Neuseeland ; Volksentscheid ; direkte Demokratie ; Zufriedenheit ; politische Einstellung ; New Zealand ; referendum ; direct democracy ; satisfaction ; political attitudeType: Zeitschriftenartikel, journal article -
15Staff View
ISSN: 1089-7658Source: AIP Digital ArchiveTopics: MathematicsPhysicsNotes: In this paper, the symmetry group of the parabolic partial differential equation ∂tf=Af is focused on (A is an analytic second-order elliptic linear differential operator on Rn). Following Olver [Applications of Lie Groups to Differential Equations (Springer, New York, 1986)], Ovsjannikov [Group Analysis of Differential Equations (Academic, New York, 1982)], and Rosencrans [J. Math. Anal. Appl. 56, 317 (1976); 61, 537 (1977)], the Lie algebra of infinitesimal symmetries is studied. It will be proven that it is finite dimensional (putting apart the trivial symmetries due to the linearity of the partial differential equation) by relating it to the Lie algebra of infinitesimal homothetic transformations of a Riemannian manifold (Rn,a), thus generalizing results of Ovsjannikov on elliptic equations and making use of the same Riemannian geometric techniques. Thanks to these techniques, the perturbation algebra of A, introduced by Rosencrans, is also shown to be related to geometric characteristics of (Rn,a).Type of Medium: Electronic ResourceURL: -
16Staff View
ISSN: 1471-4159Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: MedicineNotes: Abstract: We have studied the effect of an antibody against the epitope EYMPME on the internalization of the human muscarinic cholinergic receptor hm1 tagged with the epitope at the amino terminus. The antibody to the tag induces internalization of the hm1 receptor within minutes after exposure of human embryonic kidney 293 cells transfected with the tagged receptor. This antibody-induced internalization is reversible following removal of the antibody. In contrast to hm1 internalization induced by the agonist carbachol, internalization induced by antibody is not blocked by the muscarinic antagonist atropine. The mechanism of antibody-mediated internalization does not appear to involve receptor dimerization by the antibody, as Fab fragments derived from the antibody also induce internalization. The pathway of antibody-induced internalization, similar to the agonist-induced process, is mediated by clathrin-coated vesicles. Furthermore, antibody treatment does not result in any second messenger production, as measured by phosphoinositide accumulation. Our data show that internalization of a G protein-coupled receptor can be triggered by interaction of the amino terminus of the receptor with an exogenous ligand and can occur independently of second messenger production. This result suggests that the receptor can exist in multiple conformations, each mediating distinct downstream events.Type of Medium: Electronic ResourceURL: -
17Wang, Danxin ; Tolbert, Lara M. ; Carlson, Kurt W. ; Sadée, Wolfgang
Oxford UK : Blackwell Science Ltd.
Published 2000Staff ViewISSN: 1471-4159Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: MedicineNotes: Abstract: Previous evidence has suggested a role for calmodulin(CaM) in opioid receptor signaling. We demonstrate here that morphinestimulation of the μ-opioid (OP3) receptor causes rapid CaMtranslocation to the nucleus in OP3-transfected human embryonickidney (HEK)-293 cells and in SH-SY5Y human neuroblastoma cells.Ca2+ influx into the cells resulting from OP3 receptoractivation was required for nuclear CaM translocation. Moreover, inHEK-OP3 and SH-SY5Y cells, increased nuclear CaM content wasassociated with enhanced phosphorylation of the nuclear transcription factorcyclic AMP-responsive element-binding protein. This appeared to be mediated byCa2+/CaM kinases and also by a pathway involving protein kinase C.CaM was previously shown to bind directly to the OP3 receptor andto be released from the plasma membrane on agonist stimulation. To testwhether OP3-mediated CaM release contributes to nuclear CaMsignaling, we used a mutant OP3 receptor (K273A) with reducedaffinity for CaM that fails to release CaM from the plasma membrane.K273A-OP3 activated Ca2+ influx to a similar extent aswild-type OP3; however, CaM translocation to the nucleus wasattenuated. These results indicate that OP3-stimulatedCa2+ influx results in nuclear CaM translocation, which appears tobe enhanced by simultaneous CaM release by OP3 wild-type receptorfrom plasma membranes. These results suggest a novel Ca2+/CaM signaling pathway of opioid receptors in the regulation of transcriptional activity.Type of Medium: Electronic ResourceURL: -
18Morais, P. C. ; Lara, M. C. F. L. ; Tronconi, A. L. ; Tourinho, F. A. ; Pereira, A. R. ; Pelegrini, F.
[S.l.] : American Institute of Physics (AIP)
Published 1996Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: Magnetic resonance is used to study magnetic dipole particle–particle interaction in ionic water-based iron-manganese magnetic fluids. A set of six samples having particle concentration running from 1.2×1016 to 6.3×1016 particles/cm3 were frozen below room temperature and analyzed in the range of 100–250 K. Average values of magnetic particle–particle interaction energy were obtained from the temperature dependence of the resonance linewidth broadening. At 1.2×1016 particles/cm3 magnetic particle–particle interaction energy is found to be of the order of 1.2 meV. However, at 6.3×1016 particles/cm3 magnetic particle–particle interaction energy goes to 32 meV. The enhancement of the magnetic particle–particle interaction energy far beyond the linearity is associated to cluster structuration. A one-dimensional model for cluster structuration is presented. © 1996 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
19Torres-Delgado, G. ; Castanedo-Perez, R. ; Diaz-Arencibia, P. ; Mendoza-Alvarez, J. G. ; Orozco-Vilchis, J. L. ; Murillo-Lara, M. ; Serra-Jones, A.
[S.l.] : American Institute of Physics (AIP)
Published 1995Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: Low-temperature photoluminescence spectroscopy was used to study AlxGa1−xAs intrinsic epitaxial layers in the range of aluminum content between 0.45〈x〈0.9 in the region where the band gap minimum is indirect. Nonintentionally doped samples were grown by liquid phase epitaxy very near the saturation temperature (∼800 °C). The heterostructures consisted of an AlxGa1−xAs layer grown on top of a GaAs Si-doped (n∼2×1018 cm−3) substrate with orientation (100) 2° toward the (110). There is little information on the zero phonon excitonic lines for Al compositions x(approximately-greater-than)0.6, because the appearance of these lines depends on several factors such as internal strength, crystalline defects, and impurities. In our samples the excitonic lines were observable up to x=0.9. Transitions related to bound-to-free carrier as well as their phonon replicas were observable too. The data obtained from the spectra fitted with multigaussian lines allowed us to estimate the dependencies on the Al composition, x, of the bound exciton peak, the bound exciton binding energy, and the exciton localization energy. The acceptor ionization energy attributed to carbon residual impurities in As sites and its dependence on x was also obtained. Fitting by Gaussian lines the phonon region, the PL spectra fitted better with the TO(X) AlAs-type branch rather than the LO(X) AlAs-type, with a linear dependence with x in the studied range. The phonon energies of the GaAs type seem to behave almost constant and it was difficult to assign them to the LO(X) GaAs type or to TO(X) GaAs type due to the scatter of the data for high values of x. Other phonon replicas from the bound exciton and the electron-to-acceptor carbon transition (e-A°) coincide with the LO(X) AlAs type and TA(X), TA(X)+LA(X) and two LA(X) phonon energies. All the dependencies we present here are valid for aluminum compositions in the range 0.48〈x〈0.90. © 1995 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
20Choi, K. K. ; Fotiadis, L. ; Taysing-Lara, M. ; Chang, W. ; Iafrate, G. J.
Woodbury, NY : American Institute of Physics (AIP)
Published 1991Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: An infrared hot-electron transistor with a thin (300 A(ring))InGaAs base layer is constructed. By adopting a thin base material with a large Γ-L valley separation, the photocurrent transfer ratio is improved by a factor of four in comparison with the GaAs base transistor. As a result, the detectivity of the transistor is increased to 1.4×1010 cm(square root of)Hz/W at 77 K with a cutoff wavelength of 9.5 μm, two times as large as the companion state-of-the-art GaAs quantum well photoconductor. Combined with the lower dark current, the voltage responsivity and the noise equivalent temperature difference of a detector array can be improved by more than an order of magnitude.Type of Medium: Electronic ResourceURL: