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  • 1
    Digitale Medien
    Digitale Medien
    Time resolved photoluminescence studies in a reverse biased quantum well laser structure (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 2497-2499 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report measurements of photoluminescence decay time in a reverse biased GaAs/AlGaAs graded index separate confined heterostructure single quantum well (GRINSCH-SQW) laser, as a function of bias voltage at temperatures of 20, 70, and 150 K. For certain bias voltages and temperatures, we observe extremely fast escape times of optically generated carriers. We propose a simple model based on photogenerated electron recombination in the quantum well, and escape via direct tunneling out of the lower bound electronic level, thermally assisted tunneling out of the upper weakly bound state, or thermionic emission over the barrier. We have performed a theoretical calculation of each of these processes and show that the data agrees well with the direct and thermally assisted tunneling times and that the thermionic emission term underestimates the times.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.108160
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  • 2
    Digitale Medien
    Digitale Medien
    Herbicides and Selective Phytotoxicity (1951)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Plant Physiology 2 (1951), S. 199-230 
    Details
    ISSN: 0066-4294
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.pp.02.060151.001215
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  • 3
    Digitale Medien
    Digitale Medien
    Effects of Duchenne muscular dystrophy on muscle protein synthesis (1982)
    [s.l.] : Nature Publishing Group
    Nature 296 (1982), S. 165-167 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] We studied seven normal fed adult men aged 22-65 yr and five boys with Duchenne muscular dystrophy, aged 12-1 Syr. Three of the patients were wheelchair bound and the two youngest were on the verge of becoming so. Investigations of these subjects using radioactive isotopes would not have been ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/296165a0
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  • 4
    Digitale Medien
    Digitale Medien
    Recent advances in the use of labelled amino-acids to quantitate protein metabolism in man
    Amsterdam : Elsevier
    International Journal of Radiation Applications & Instrumentation. Part 39 (1988), S. 523 
    Details
    ISSN: 0883-2889
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Energietechnik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0883-2889(88)90229-8
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  • 5
    Digitale Medien
    Digitale Medien
    A resin-based method for the preparation of molecular nitrogen for ^1^5N analysis from urinary and plasma components
    Amsterdam : Elsevier
    Analytical Biochemistry 123 (1982), S. 249-254 
    Details
    ISSN: 0003-2697
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Biologie , Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1016/0003-2697(82)90442-0
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  • 6
    Digitale Medien
    Digitale Medien
    Geodetic Measurements by Radar (1949)
    [s.l.] : Nature Publishing Group
    Nature 164 (1949), S. 1005-1006 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] HART1 has referred to the potential uses of radar in geodesy and photogrammetry. The War Office has now granted permission to publish details of geodetic observations made in Italy by radar during May–June 1945. The general principle of these observations was that an aircraft, a ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/1641005a0
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  • 7
    Digitale Medien
    Digitale Medien
    Molecular analysis of eight mutations in FBN1 (1999)
    Springer
    Human genetics 〈Berlin〉 105 (1999), S. 587-597 
    Details
    ISSN: 1432-1203
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract. Mutations in the gene encoding extracellular glycoprotein fibrillin-1 (FBN1) cause Marfan syndrome (MFS) and other related connective tissue disorders. In this study, eight mutations have been detected in MFS patients by heteroduplex analysis. These comprise two missense mutations, C1835Y and C2258Y in calcium-binding epidermal growth factor-like domains, two nonsense mutations, R1541X and R2394X in transforming growth factor β1-binding protein-like domains, one splice site mutation, which has been detected previously, and three small insertions or deletions resulting in a frameshift. Fibroblast cells have been established from seven of the MFS patients and the biochemical effects of the mutations on fibrillin-1 synthesis and secretion assessed by pulse-chase analysis. Each cysteine mutation resulted in the delayed secretion of fibrillin-1 and both nonsense and frameshift mutations caused reduced levels of synthesis and/or deposition of fibrillin-1. Indirect immunofluorescence and rotary shadowing electron microscopy analysis of fibrillin microfibrils revealed no major differences between normal and patient samples. We discuss the relative merits of the biochemical techniques used in this study.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004399900190
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  • 8
    Digitale Medien
    Digitale Medien
    Effect of interdiffusion and impurities on thin film CdTe/CdS photovoltaic junctions (2000)
    Springer
    Journal of materials science 11 (2000), S. 525-530 
    Details
    ISSN: 1573-482X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Maschinenbau
    Notizen: Abstract We have used low temperature photoluminescence (PL) to study thin film CdTe/CdS solar cell structures. The devices were produced by close space sublimation (CSS) and have undergone a post-growth treatment, a vital step in increasing device efficiency. The treatment consisted of evaporating a thin layer of CdCl2 onto the back CdTe surface and heat treating in air at 400 °C for between 10 and 120 min. This produced a range of device efficiencies from 2% to 9%. The efficiency improvements are the result of a complex interaction between the CdCl2, impurities and sulfur interdiffusion. The structures were prepared for PL by a chemical bevel etching technique which allows the luminescence emission to be studied as a function of depth throughout the sample. The main features in the PL spectra have been identified as being due to the Cl-A center and the Te-dislocation-related Y luminescence band. Using PL we have quantified the S diffusion into the CdTe which has a maximum of 20% at the interface in the most efficient samples. We have also obtained the profiles of recombination and non-radiative recombination centers in the device. We observe correlations between impurity centers and device efficiency which can help explain the effects of the CdCl2 treatment on the optoelectronic properties of the CdTe/CdS junction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1026565632569
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  • 9
    Digitale Medien
    Digitale Medien
    Practical considerations in the use of stable isotope labelled compounds as tracers in clinical studies (1989)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 18 (1989), S. 321-327 
    Details
    ISSN: 0887-6134
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Increasingly widespread usage of stable isotope tracers to aid clinical diagnosis and support basic research has stemmed from both advances in mass spectrometry and the availability of competitively priced labelled compounds. Stable isotopes have been used generally to investigate normal and abnormal metabolic pathways, to estimate energy expenditure and body composition and to quantitate substrate flux and oxidation rates. Despite the fact that the underlying principles relating to the use of stable isotopes for in vivo studies are straightforward, careful consideration must be given to all aspects of human studies. This review highlights some of these, including choice of label and tracer molecule, mode of tracer administration and sampling site, analytical instrumentation, interpretation of data and ethical constraints.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bms.1200180507
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  • 10
    Digitale Medien
    Digitale Medien
    Analysis of (1-13C)leucine and (13C)KIC in plasma by capillary gas chromatography/mass spectrometry in protein turnover studies (1985)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 12 (1985), S. 432-436 
    Details
    ISSN: 1052-9306
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The methods used for the determination of the concentration and isotope enrichment of (1-13C)leucine and its metabolite (13C)α-ketoisocaproic acid (KIC) in plasma for the study of whole-body protein turnover are described. Leucine was analysed as its N-heptafluorobutyryl isobutyl ester and KIC as its quinoxalinol-TMS derivative, both by chemical ionization selected ion monitoring gas chromatography/mass spectrometry (GC/MS). The sensitivity of the leucine assay was improved 30 times by monitoring the negative ions under the conditions described. The coefficient of variation for enrichment and concentration measurements were 0.5% and 2%, respectively, with a minimum detectable enrichment of 0.1at% excess for both assays.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bms.1200120814
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