Search Results - (Author, Cooperation:O. Flores)

Showing 1 - 9 results of 9, query time: 0.17s Refine Results
  1. 1
  2. 2
    Staff View
    Publication Date:
    2014-01-17
    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:
    Aging/metabolism ; Biomass ; *Body Size ; Carbon/*metabolism ; *Carbon Cycle ; Climate ; Geography ; Models, Biological ; Plant Leaves/growth & development/metabolism ; Sample Size ; Species Specificity ; Time Factors ; Trees/*anatomy & histology/classification/growth & development/*metabolism ; Tropical Climate
    Published by:
    Latest Papers from Table of Contents or Articles in Press
  3. 3
    Korneev, N. ; Ramirez, O. Flores

    [S.l.] : American Institute of Physics (AIP)
    Published 2002
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    In this article, we present pyroelectric investigations of electrically poled side-chain polymers containing mesogenic disazobenzene chromophores using a very simple setup. Heating above the glass temperature (about 104°C) usually eliminates the pyroelectric effect of the sample. However, in samples with an indium tin oxide/aluminum electrode design, a self-poling effect is observed. The pyroelectric coefficients of electrically poled samples reach values of up to 0.2 μC/(m2K). From this, we conclude that the strongly anisometric side chains can be reoriented, and that their degree of alignment is about 3%. © 2002 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  4. 4
    Mermelstein, F.H. ; Flores, O. ; Reinberg, D.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0167-4781
    Keywords:
    RNA polymerase II ; Transcription initiation
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  5. 5
    Staff View
    ISSN:
    0009-9120
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Medicine
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  6. 6
    Staff View
    ISSN:
    1433-075X
    Keywords:
    Key words Transmission electron microscopy ; Dynamic recrystallization ; Aluminum alloys ; Copper/aluminum alloy bimetal weld ; Extreme solid-state plastic flow
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes:
    Abstract  The microstructures of friction-stir welded aluminum alloys (1100 and 6061) are dominated by dynamic recrystallization. Friction-stir welding of 6061 aluminum to copper produced a complex, intercalated microstructure which was also dominated by dynamic recrystallization. The friction-stir welding process is characterized by extreme plastic deformation in the solid state; there is no associated melting.
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  7. 7
    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 Observations and measurements of the kinetics of coarsening and dissolution of large cuboidal niobium carbonitrides during solution treatments of a high nitrogen niobium microalloyed steel are reported. At temperatures between 1473 and 1573 K a competitive coarsening and dissolution process was established where the larger niobium carbonitrides grew at the expense of the smaller, or employing niobium and nitrogen which remained in solid solution. In this temperature range growth or dissolution rates and critical sizes could be determined from the analysis of the evolution of particle size distribution. At higher temperatures (1623–1723 K), only a dissolution process existed, where the dissolution rates as a function of particle size was found to increase with increasing temperature.
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  8. 8
    Flores, O ; Martinez, L
    Springer
    Published 1997
    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 An investigation was made of the grain-growth kinetics of the V–Nb microalloyed steel austenite phase at temperatures in the range 1173–1373 K, relevant for the understanding of the steel thermomechanical processing. The fine precipitation of vanadium- and niobium-rich particles plays an important role in helping the alloy to maintain a fine grain structure, which was characterized using optical microscopy, scanning electron microscopy and transmission electron microscopy. It was found that at temperatures where the fine precipitate particles are stable, the grain-growth process is slow and the mode of grain growth is normal. At higher temperatures where the precipitates are prone to dissolve, the abnormal grain-growth mode dominates. All the observations were comprised in a time–temperature map of the grain-growth modes. The map was built up by employing extensive line-intercept measurements of grain sizes at different temperatures and annealing times, followed by numerical calculations yielding curves of grain-growth rate as a function of grain size at different time intervals. The present experimental observations were found consistent with the results of calculations and predictions of the earlier theoretical work.
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  9. 9
    Staff View
    ISSN:
    1573-2568
    Keywords:
    hepatic cirrhosis ; hyaluronan ; endotoxin ; cytokines ; ascites
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Medicine
    Notes:
    Abstract Our objective was to investigate the relationship between endotoxin and hyaluronan synthesis and release in serum and ascitic fluid from cirrhotic patients. We studied hyaluronan, endotoxin, albumin, and creatinine levels in ascitic fluid and plasma and cytokine levels (IL-1β, IL-6, TGF-β) in ascitic fluid. TGF-β, IL-6, and IL-1β correlation analyses indicated a strong dependence of the production of these cytokines on endotoxin levels. Correlation analyses for TGF-β and IL-6 indicated a strong dependence of the production of hyaluronan on cytokine levels and, to a lesser extent, on IL-1β levels. Hyaluronan analysis indicated that a certain glycosaminoglycan level is required in ascites before its appearance in plasma. Our results disclosed elevated plasma hyaluronan concentrations. The simultaneous increased hyaluronan levels in ascitic fluid do not seem to be derived from the systemic circulation. In conclusion, the high hyaluronan-ascites/hyaluronan-plasma ratio suggests an intrinsic hyaluronan production from peritoneal cells induced by endotoxins.
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses