Search Results - (Author, Cooperation:S. Afonso)

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  1. 1
    Staff View
    Publication Date:
    2014-08-30
    Publisher:
    American Association for the Advancement of Science (AAAS)
    Print ISSN:
    0036-8075
    Electronic ISSN:
    1095-9203
    Topics:
    Biology
    Chemistry and Pharmacology
    Computer Science
    Medicine
    Natural Sciences in General
    Physics
    Keywords:
    Animals ; Animals, Domestic/anatomy & histology/*genetics/psychology ; Animals, Wild/anatomy & histology/*genetics/psychology ; Base Sequence ; Behavior, Animal ; Breeding ; Evolution, Molecular ; Gene Frequency ; Genetic Loci ; Genome/genetics ; Molecular Sequence Data ; Phenotype ; Polymorphism, Single Nucleotide ; Rabbits/anatomy & histology/*genetics/psychology ; Selection, Genetic ; Sequence Analysis, DNA
    Published by:
    http://www.aaas.org/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Chen, K. Y. ; Afonso, S. ; Wang, R. C. ; Tang, Y. Q. ; Salamo, G. ; Chan, F. T. ; Guo, R. ; Bhalla, A. S.

    [S.l.] : American Institute of Physics (AIP)
    Published 1995
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Sr2(AlTa)O6 thin films (2000–3000 A(ring)) have been deposited on MgO (001) substrates using pulsed laser deposition (PLD). X-ray-diffraction analysis shows that the Sr2(AlTa)O6 grows with the c axis highly oriented normal to the substrate plane and very good in-plane epitaxy. The subsequently deposited YBa2Cu3O7−x films using PLD on Sr2(AlTa)O6 buffered MgO substrates exhibit excellent epitaxial growth with a narrow rocking curve width and a small φ scan peak width. The critical temperature Tc0 of 90–92 K has been achieved reproducibly and the critical current density is over 2.7×106 A/cm2 at 77 K. © 1995 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.360197

    Articles: DFG German National Licenses
  3. 3
    Xiong, Q. ; Afonso, S. ; Tang, Y. Q. ; Chan, F. T. ; Salamo, G. ; Xue, Y. Y. ; Chu, C. W.

    [S.l.] : American Institute of Physics (AIP)
    Published 1996
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    HgBa2CuO4+δ (Hg1201) samples with 0.03≤δ≤0.4 have been obtained. The magnetization of the powdered Hg1201 samples was determined using a Quantum Design SQUID magnetometer. It was observed that while the magnetization of Hg1201 increased with δ in the underdoped region, the magnetization decreased with δ in the overdoped region. These results suggest an increase of ns/m* with oxidation in the underdoped region and a decrease in the overdoped region, similar to that reported in underdoped HTSs and overdoped Tl2201 and Tl1201. © 1996 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.361951

    Articles: DFG German National Licenses
  4. 4
    Afonso, S. ; Chan, F. T. ; Chen, K. Y. ; Salamo, G. J. ; Tang, Y. Q. ; Wang, R. C. ; Xu, X. L. ; Xiong, Q. ; Florence, G. ; Scott, S. ; Ang, S. ; Brown, W. D. ; Schaper, L. W.

    [S.l.] : American Institute of Physics (AIP)
    Published 1996
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    In order to build high-temperature superconductor (HTS) multichip modules (MCMs), it is necessary to grow several epitaxial layers of YBCO that are separated by thick dielectric layers without seriously affecting the quality of the YBCO layers. In this work, we have successfully fabricated YBCO/YSZ/SiO2/YSZ/YBCO structures on single-crystal LaAlO3 substrates using a combination of pulsed laser deposition for the YBCO layers and ion-beam-assisted rf sputtering to obtain biaxially aligned YSZ intermediate layers. The bottom YBCO layer had a Tc∼89 K, Jc∼7.2×105 A/cm2 at 77 K, whereas the top YBCO layer had a Tc∼86 K, Jc∼6×105 A/cm2 at 77 K. The magnetic field and temperature dependence of Jc for the YBCO films in the multilayer have been obtained. The results for each of the YBCO layers within the YBCO/YSZ/SiO2/YSZ/YBCO structure are quite similar to those for a good quality single-layer YBCO film. © 1996 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.361884

    Articles: DFG German National Licenses
  5. 5
    Tang, Y. Q. ; Chen, K. Y. ; Afonso, S. ; Xu, X. L. ; Xiong, Q. ; Salamo, G. ; Chan, F. T. ; Guo, R. ; Bhalla, A.

    [S.l.] : American Institute of Physics (AIP)
    Published 1995
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Epitaxial Tl2Ba2CaCu2O8 superconducting films have been successfully grown on the dielectric Sr2(AlTa)O6 (SAT) buffer layers. X-ray diffraction data showed that the films were highly c-axis oriented with a rocking curve full width half maximum as narrow as 0.3°. The films also had an excellent in-plane epitaxy with Tl2Ba2CaCu2O8[100] aligned with SAT[100] and MgO[100] of the substrate. The zero resistance temperature Tc of the superconducting films ranged from 95 to 103 K and the transport critical current density Jc in zero field was 3×105 A/cm2 at 77 K. © 1995 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.360446

    Articles: DFG German National Licenses
  6. 6
    Afonso, S. ; Blau, F. M. ; Bandow, G. T. ; Rowe, G. G.
    Springer
    Published 1978
    Staff View
    ISSN:
    1435-1803
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Medicine
    Notes:
    Summary In control dogs mannitol produced a moderate increase in coronary blood flow, a decrease in coronary vascular resistance, and a moderate increase in cardiac output. In dogs with coronary occlusion mannitol increased retrograde coronary blood flow (+25%) and collateral conductance suggesting increased blood availability to ischemic myocardium.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01906515

    Articles: DFG German National Licenses
  7. 7
    Asselbergs, M. ; Jongejan, F. ; Langa, A. ; Neves, L. ; Afonso, S.
    Springer
    Published 1993
    Staff View
    ISSN:
    1573-7438
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Medicine
    Description / Table of Contents:
    Résumé Des cultures cellulaires endothéliales ont été initiées à partir des artères du cordon ombilical de bovin. Ultérieurement infectées parCowdria ruminantium, elles ont été utilisées comme antigène dans la recherche des anticorps par fluorescence indirecte. 374 sérums de bovins et 388 sérums de chèvres, prélevés dans 6 provinces du Mozambique, ont ainsi été testés. Globalement, des anticorps deCowdria ont été décelés dans 30,4 p. 100 des sérums caprins et 43 p. 100 des sérums bovins. Au nord de la rivière Save, où la tiqueAmblyomma variegatum est largement présente, les pourcentages globaux de sérums positifs étaient bas avec 10 p. 100 chez les chèvres et 20 p. 100 chez les bovins. Mais au sud de cette rivière, où la tiqueAmblyomma hebraeum est abondante, les pourcentages étaient beaucoup plus élevés avec 63,5 p. 100 chez les chèvres et 59,4 p. 100 chez les bovins. Les auteurs discutent ces résultats en les rapprochant d'observations de terrain qui indiquent que la maladie clinique est rare ou absente dans le nord avec, au sud, une instabilité enzootique chez les caprins et les veaux de race Frisonne.
    Abstract:
    Resumen Se utilizó como antígeno para inmunofluorescencia indirecta, un cultivo de células endoteliales establecido a partir de arterias umbilicales bovinas e infectado conCowdria ruminantium. Se analizaron 374 sueros bovinos y 388 caprinos colectados en 6 provincias mozambiqueñas. De los sueros caprinos, el 30-4% fue positivo, lo mismo que el 43% de los sueros bovinos. Al norte del río Save, donde la garrapataAmblyomma variegatum es prevalente, los porcentajes de positividad fueron bajos, 10% en cabras y 20% en ganado. Sin embargo, al sur del rio donde la garrapataAmblyomma hebraeum es abundante, los porcentajes fueron más altos, 63·5% en cabras y 59·4% en ganado. Se discuten los resultados en relación a observaciones de campo, que la enfermedad clínica es rara o ausente en en el norte, con estabilidad enzoótica en cabras y terneros Friesian en el sur.
    Notes:
    Summary Endothelial cell cultures, established from bovine umbilical cord arteries and subsequently infected withCowdria ruminantium, were used as antigen in the indirect fluorescent antibody test. Bovine sera (374) and caprine sera (388) collected in 6 provinces of Mozambique were tested. Overall, 30·4% of goat sera had antibodies toCowdria, and 43% of sera collected from cattle. North of the River Save, where the tickAmblyomma variegatum is highly prevalent, overall percentages of positive sera were low, 10% in goats and 20% in cattle. However, south of the river where the tickAmblyomma hebraeum is abundant percentages were much higher, 63·5% in goats and 59·4% in cattle. These results are discussed in relation to field observations that clinical disease is rare or absent in the north with enzootic instability in goats and Friesian calves in the south.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF02236232

    Articles: DFG German National Licenses
  8. 8
    Afonso, S. ; Blau, F. M. ; Rowe, G. G.
    Springer
    Published 1976
    Staff View
    ISSN:
    1435-1803
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Medicine
    Description / Table of Contents:
    Zusammenfassung Fendilin-Hydrochlorid (1 mg/kg i.v.) verursachte eine leichte Zunahme der Koronardurchblutung sowie eine Zunahme der myokardialen Sauerstoffaufnahme an 9 normalen narkotisierten Hunden. Die Wirkungsdauer betrug etwa 10 Minuten. Bei 7 narkotisierten Hunden mit einem akuten Koronarverschluß konnte nach Fendilin keine Änderung des Kollateralwiderstandes festgestellt werden. Es traten keine signifikanten Änderungen der Hämodynamik auf.
    Notes:
    Summary Fendilin hydrochloride was tested in 9 normal anesthetized dogs and in 7 anesthetized dogs with acute coronary artery occlusion. The compound (1 mg/kg i.v.) caused a slight short lasting increase in coronary blood flow together with an increase in cardiac metabolic rate for oxygen of similar magnitude. There was no measurable effect on collateral conductance. No noteworthy effects on systemic hemodynamics were observed.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01906410

    Articles: DFG German National Licenses
  9. 9
    Afonso, S. ; Henderson, R. R. ; Folts, J. D. ; Rowe, G. G.
    Springer
    Published 1975
    Staff View
    ISSN:
    1435-1803
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Medicine
    Notes:
    Abstract Adenosine is a naturally occurring substance with potent coronary vasodilator action. However, its action is of short duration due to its rapid inactivation in blood and other tissues (1). If used for therapeutic purposes a prolonged duration of action might be desirable. A recent adenosine derivative (Abbott 40557) ethyl-adenosine-5′-carboxylate hydrochloride has marked and prolonged coronary vasodilator activity (2, 3). The present report concerns the coronary and systemic hemodynamic and metabolic effects of A 40557 and attempts to determine whether, like adenosine, its action is enhanced by dipyridamole (4, 5), hexobendine (6), and Cassella 7657 (7) or inhibited by aminophylline (8, 9).
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01914335

    Articles: DFG German National Licenses
  10. 10
    Staff View
    ISSN:
    1435-1803
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Medicine
    Notes:
    Summary 1. This study in anesthetized mongrel dogs reports the acute systemic and coronary hemodynamic effects of direct current transthoracic shock similar to that used to change cardiac rhythm. 2. In control animals there was an impressive almost immediate increase in cardiac rate, output and work and an acute transient reduction in systemic, pulmonary and coronary vascular resistance which quickly returned toward normal. 3. The cardiovascular response is damped somewhat but still present after beta adrenergic blockade with propranolol or reserpine depletion of catecholamines. Thus catecholamine release is believed to be partially but not completely responsible for the changes seen. 4. The response is also reduced by vagotomy and by local anesthesia of the chest wall beneath the site of application of the paddles. The possibility is discussed that the response represents the complex reflex known as the “alarm” reaction. 5. The acute hemodynamic changes produced by transthoracic current discharge could be important in some of the infrequent complications of electrical conversion of cardiac arrhythmias. 6. A minor increase in coronary sinus blood temperature occurred with a 200 and 400 Watt second transthoracic discharge. It would seem likely that this should have been greater if a cardiac thermal burning were produced.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01907683

    Articles: DFG German National Licenses