Search Results - (Author, Cooperation:R. Fonseca)

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  1. 1
    Staff View
    Publication Date:
    2018-03-16
    Publisher:
    American Chemical Society (ACS)
    Topics:
    Chemistry and Pharmacology
    Published by:
    http://www.acs.org/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Staff View
    Publication Date:
    2018-10-25
    Publisher:
    Nature Publishing Group (NPG)
    Electronic ISSN:
    2045-2322
    Topics:
    Natural Sciences in General
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  3. 3
    Staff View
    Publication Date:
    2011-03-25
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Keywords:
    Amino Acid Sequence ; Blood Coagulation/genetics ; CpG Islands/genetics ; DNA Mutational Analysis ; DNA Repair/genetics ; Exons/genetics ; Exosome Multienzyme Ribonuclease Complex ; Genome, Human/*genetics ; Genomics ; Histones/metabolism ; Homeodomain Proteins/genetics ; Homeostasis/genetics ; Humans ; Methylation ; Models, Molecular ; Molecular Sequence Data ; Multiple Myeloma/drug therapy/enzymology/*genetics/metabolism ; Mutation/*genetics ; NF-kappa B/metabolism ; Oncogenes/genetics ; Open Reading Frames/genetics ; Protein Biosynthesis/genetics ; Protein Conformation ; Proto-Oncogene Proteins B-raf/antagonists & inhibitors/genetics/metabolism ; RNA Processing, Post-Transcriptional/genetics ; Ribonucleases/chemistry/genetics ; Signal Transduction/genetics ; Transcription, Genetic/genetics
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  4. 4
    Fonseca R, Jose K, Marwick T.
    Oxford University Press
    Published 2018
    Staff View
    Publication Date:
    2018-03-06
    Publisher:
    Oxford University Press
    Print ISSN:
    1525-2167
    Electronic ISSN:
    1532-2114
    Topics:
    Medicine
    Published by:
    http://global.oup.com/

    Latest Papers from Table of Contents or Articles in Press
  5. 5
    Ren, C. ; Duda, B. J. ; Evans, R. G. ; Fonseca, R. A. ; Hemker, R. G. ; Mori, W. B.

    [S.l.] : American Institute of Physics (AIP)
    Published 2002
    Staff View
    ISSN:
    1089-7674
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The nonlinear interaction between light beams in a plasma is studied. In particular, nonlinearities due to relativistic mass corrections and density modulations from a plasma wave wake are considered; but the results can be generalized for other nonlinearities. A simple physical picture using the nonlinear phase velocity of the light wave in a plasma is developed to show that when two laser beams are coherent, the force can be repulsive or attractive, depending on their relative phase. When the two laser beams are polarized in mutually perpendicular directions, the force is always attractive. Using a variational method, a simple analytical expression for this attractive force is derived for Gaussian beams. The centers of the lasers move analogously to point masses under this attractive force with the laser power playing the role of the mass. Under an attractive force, solutions exist where the two lasers can spiral around each other. It is also shown that the plasma wave wake can cause the two spiraling lasers to become intertwined forming a braided pattern. The braiding is common to any nonlinearity which is not instantaneous. The analytical results concerning attraction, repulsion, and braiding have been confirmed using three dimensional particle-in-cell simulations. The simulations also show that angular momentum can radiate away leading to the coalescence of the remaining energy. © 2002 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.1452731

    Articles: DFG German National Licenses
  6. 6
    Tomás, A. R. ; Praça, M. J. ; Fonseca, R. ; André, S. ; Mendonça, E.

    Oxford, UK : Blackwell Science Ltd
    Published 2004
    Staff View
    ISSN:
    1365-2303
    Source:
    Blackwell Publishing Journal Backfiles 1879-2005
    Topics:
    Medicine
    Notes:
    Determination of HER-2 status is an essential prerequisite in considering a patient's eligibility for anti-HER-2 therapy; few studies have focused on its evaluation on cytological material. We present a new method of assessing HER-2 status on cytological samples, by fluorescence in situ hybridization (FISH) with an automated detection system, using fresh frozen (FF) and May–Grünwald–Giemsa (MGG) stained smears, and we evaluate the reliability of HER-2 determination on fine needle aspiration cytology (FNAC). The pre-treatment protocol for FF smears is easier and faster than for MGG stained slides. However, with the described procedure, FISH is also feasible on archival MGG stained slides. We conclude that with this method, cytological samples obtained by FNAC, either FF or MGG, are a reliable option for assessing HER-2 status.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1111/j.1365-2303.2004.00210.x

    Articles: DFG German National Licenses
  7. 7
    Staff View
    ISSN:
    0147-619X
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Biology
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/0147-619X(88)90006-6

    Articles: DFG German National Licenses
  8. 8
    Fonseca, R. G. ; Dos Santos Cruz, C. A. ; Adabo, G. L. ; Vaz, L. G.

    Oxford, UK : Blackwell Science Ltd
    Published 2004
    Staff View
    ISSN:
    1365-2842
    Source:
    Blackwell Publishing Journal Backfiles 1879-2005
    Topics:
    Medicine
    Notes:
    summary  The limitation of photoactivation of dual-polymerized resin cements along the margins of metal restorations may adversely affect the mechanical properties of these cements, thus impairing the retention of restorations. The aim of this study was to assess the bond strength of cast metal crowns cemented with three dual-polymerized resin cements, using a chemically-activated resin cement and zinc phosphate as controls. Fifty nickel–chromium alloy crowns were cast and randomly assigned to five groups of equal size. Castings were cemented on their corresponding metal dies with one of the tested luting agents: Scotchbond Resin Cement, Enforce and Panavia F (dual-polymerized resin cements), Cement-It (chemically-activated resin cement) and Zinc Phosphate Cement (zinc phosphate cement). Specimens were stored in distilled water at 37 °C for 24 h and then loaded in tension until failure. Panavia F and Zinc Phosphate Cement provided the highest and lowest bond strength means, respectively. Scotchbond Resin Cement, Enforce and Cement-It cements exhibited similar intermediate values, but with statistically significant difference compared to the other materials (P 〈 0·05). Even with the restriction or absence of light activation, all tested dual-polymerized resin cements produced significantly higher bond strength than did the zinc phosphate cement and yielded similar or better results than the chemically activated cement. It should be pointed out that the findings of this study relate to a test scenario which does not mimic clinical circumstances and that further work is required to identify the clinical significance of the reported tensile bond strength differences between the different luting materials.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1111/j.1365-2842.2004.01345.x

    Articles: DFG German National Licenses
  9. 9
    Nolan, J. ; Fonseca, R. ; Angeletti, R.H.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0003-9861
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Biology
    Chemistry and Pharmacology
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/0003-9861(85)90031-1

    Articles: DFG German National Licenses
  10. 10
    Fonseca, R.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0048-721X
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Theology and Religious Studies
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/0048-721X(86)90004-7

    Articles: DFG German National Licenses
  11. 11
    Staff View
    ISSN:
    1573-4994
    Keywords:
    Insulators ; crystal and ligand fields ; elpasolite ; chromium ; time-resolved optical spectroscopy
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract Interest in 3d transition metal impurities in ionic crystals has increased due to their important role in the laser activity of these materials. Moreover, recent advances in tunable solid-state lasers and high-power semiconductor laser diode arrays have generated a strong interest in investigating new compounds that emit in the visible and near-infrared spectral regions. In particular, many optical studies have been devoted to Cr3+-doped fluoride crystals as a consequence of the high quality of some Cr3+-based laser materials. In the present investigation, the low-temperature emission spectra of Cr3+ ions in the hexagonal elpasolites Cs2NaAlF6 and Cs2NaGaF6 have been measured. Each compound has two crystallographically inequivalent octahedral sites for the Al3+ and Ga3+ ions that can be occupied by Cr3+ ions. For both materials, the luminescence spectrum presents two zero-phonon lines accompanied by a well-defined vibrational structure. The different peaks of the emission broad band are described in terms of phonons of the lattice and normal modes of the octahedral complex [CrF6]3−. A detailed analysis of the vibrational structure observed leads to the conclusion that the 2 E and 4 T 2 excited states of the [CrF6]3− ion are displaced along the e g and a 1g and probably the t 2g coordinates.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1023/A:1009430530367

    Articles: DFG German National Licenses
  12. 12
    Sztern, J. ; Sztern, D. ; Fonseca, R. ; Insaurralde, R.
    Springer
    Published 1993
    Staff View
    ISSN:
    1434-4726
    Keywords:
    Chondrosarcoma ; Laryngeal neoplasms
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Medicine
    Notes:
    Summary Chondrosarcoma of the larynx is a rare, slow-growing malignant tumor. One hundred and fifty cases of this entity have been reported in the literature. In 75% of cases the site of involvement was the cricoid cartilage, while 20% have involved the thyroid cartilage. The tumor presents as a space-occupying lesion in the subglottic region, or as a neck mass. An insidious, slowly progressing disease course associated with hoarseness and dyspnea accounts for usual delays in arriving at a diagnosis. We report our experiences with six cases of this entity and discuss a diagnostic and therapeutic approach. Whenever possible a conservative surgical management should be attempted.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00171706

    Articles: DFG German National Licenses
  13. 13
    Staff View
    ISSN:
    1573-4803
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes:
    Abstract Porous silicon (PS) layers are formed on p+ -type silicon wafers by electrochemical anodization in hydrofluoric acid solutions. Microechography and acoustic signature, V(z), have been performed at 1.5 GHz and 600 MHz, respectively, in order to study the elastic properties of PS layers. The thicknesses of PS layers were measured and longitudinal, shear and Rayleigh velocities and Young's modulus were obtained as a function of porosity. Equations showing the porosity dependence of bulk wave velocities and Young's modulus have also been proposed.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00352128

    Articles: DFG German National Licenses
  14. 14
    Staff View
    ISSN:
    1588-2837
    Keywords:
    Catalytic hydrogenation ; mass transfer ; methyl oleate
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Notes:
    Abstract A detailed mass transfer analysis was developed both theoretically and experimentally for the heterogeneously catalyzed hydrogenation of methyl oleate using a Ni/silica catalyst in a slurry reactor. The results indicate that, at the conditions studied, working with stirring rate between 1400 and 2000 rpm, catalyst particle size below 50 µm, and catalyst weight below 1.11 g assured the kinetic regime for the reaction.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1023/A:1010357420353

    Articles: DFG German National Licenses