Search Results - (Author, Cooperation:E. Khoo)

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  1. 1
    Staff View
    Publication Date:
    2015-08-13
    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:
    *Altitude ; Animal Migration ; Animals ; *Biota ; Climate Change ; DNA Barcoding, Taxonomic ; Extinction, Biological ; Introduced Species/*statistics & numerical data ; Malaysia ; Molecular Sequence Data ; *Phylogeny ; *Phylogeography ; Plants/classification/genetics ; Time Factors ; *Tropical Climate
    Published by:
    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Staff View
    Publication Date:
    2018-02-28
    Publisher:
    BMJ Publishing
    Electronic ISSN:
    2044-6055
    Topics:
    Medicine
    Keywords:
    Open access, General practice / Family practice, Communication
    Published by:
    Latest Papers from Table of Contents or Articles in Press
  3. 3
    Pabla, A. S. ; Woodhead, J. ; Khoo, E. A. ; Grey, R. ; David, J. P. R. ; Rees, G. J.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1996
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The spectral electroluminescence characteristics of broad-area (Al)GaAs/In0.23Ga0.77As/(Al)GaAs single quantum well separate confinement heterostructure lasers grown on (111)B GaAs have been studied under forward biased current injection. A room-temperature threshold current density of 750 A/cm2 is measured for a 1000 μm laser. The subthreshold electroluminescence spectrum blue shifts with increasing current up to the point of lasing threshold. Our measurements reveal that lasing is achieved while there is a strong residual or "unscreened'' electric field across the quantum well. Based on these observations we outline how piezoelectric quantum wells can be used to monolithically integrate a quantum well laser with a blue-shifting electroabsorption modulator. © 1996 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  4. 4
    Khoo, E. A. ; David, J. P. R. ; Woodhead, J. ; Grey, R. ; Rees, G. J.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1999
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The photoluminescence linewidths of strained InxGa1−xAs/GaAs quantum wells grown on (111)B GaAs substrates are shown to differ radically from those grown on (001) substrates. In (111)B structures, the linewidth in wide wells is broadened significantly compared with (001) structures. This broadening cannot be explained by well width or alloy fluctuations alone, and suggests the presence of another mechanism which we believe is due to the piezoelectric field and its sensitivity to screening under illumination. © 1999 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses
  5. 5
    Staff View
    ISSN:
    1573-2568
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Medicine
    Notes:
    Summary The serum concentration and urine excretion of LAP was determined by the method of Goldbarg and Rutenburg in 187 patients. Using their criteria, 9 of 17 patients with ampullary or pancreatic cancer, had elevations of LAP in their serum, urine, or both—characteristic of malignancy. Four additional patients had abnormal LAP levels of lesser magnitude. In the patients without pancreatic malignancy, elevations of LAP concentration, considered characteristic of cancer of the pancreas, occurred in the serum in 4 patients and in the urine in 22 patients. There was no correlation between the serum LAP levels by the Goldbarg and Rutenburg method as compared to the Fleisher method. The former appears to be more specific for pancreatic malignancy.
    Type of Medium:
    Electronic Resource
    URL:
    Articles: DFG German National Licenses