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  • 1
    Electronic Resource
    Electronic Resource
    Closely stacked InAs/GaAs quantum dots grown at low growth rate (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 1544-1546 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present a systematic study of closely stacked InAs/GaAs quantum dots (QDs) grown at low growth rates. Transmission electron microscopy reveals that for thin spacer layers vertically aligned QDs merge into one large QD. After capping the initial QD layer the GaAs surface is decorated with well-developed nanostructures, which act as nucleation centers for the QDs deposited in the second layer. Despite the size increase, photoluminescence (PL) experiments show a systematic blueshift up to 103 meV of the QD related signal with decreasing spacer thickness. We explicitly show that this significant blueshift cannot fully be ascribed to specific growth phenomena, but instead is caused by the actual presence of the second dot layer. We report a PL linewidth as narrow as 16 meV at low temperature for a sample with 5 nm spacer thickness. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1456954
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  • 2
    Electronic Resource
    Electronic Resource
    Photoluminescence of ultrasmall Ge quantum dots grown by molecular-beam epitaxy at low temperatures (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 1279-1281 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Low-temperature epitaxial growth of Si–Ge heterostructures opens possibilities for synthesizing very small and abrupt low-dimensional structures due to the low adatom surface mobilities. We present photoluminescence from Ge quantum structures grown by molecular-beam epitaxy at low temperatures which reveals a transition from two-dimensional to three-dimensional growth. Phononless radiative recombination is observed from 〈105〉 faceted Ge quantum dots with height of approximately 0.9 nm and lateral width of 9 nm. Postgrowth annealing reveals a systematic blueshift of the Ge quantum dot's luminescence and a reduction in nonradiative recombination channels. With increasing annealing temperatures Si–Ge intermixing smears out the three-dimensional carrier localization around the dot. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1430508
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  • 3
    Electronic Resource
    Electronic Resource
    Enhanced Absorption within a Cavity. A Study of Thin Dye Layers with the Surface Forces Apparatus (1994)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 11119-11125 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100094a021
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  • 4
    Electronic Resource
    Electronic Resource
    T-Cell Receptor Gene Usage of Acetylcholine Receptor-specific T-Helper Cells (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 681 (1993), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1993.tb22904.x
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of malate and 2-oxoglutarate on the NIA transcript level and nitrate reductase activity in tobacco leaves (2001)
    Oxford, UK : Blackwell Science Ltd
    Plant, cell & environment 24 (2001), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Nitrate assimilation in leaves requires synthesis of malate to counteract alkalinization, and synthesis of 2-oxoglutarate to act as an acceptor in the GOGAT pathway. We have investigated whether malate or 2-oxoglutarate regulate nitrate reductase (NIA, EC 1·6.6·1) expression. (i) Diurnal changes of NIA expression and organic acid levels were compared in tobacco leaves. The NIA transcript rose during the night and decreased during the day, and NIA activity rose to a maximum during the first 4 h of the light period and fell during the second part of the light period. Malate accumulated to high levels during the light period and decreased during the night. The 2-oxoglutarate increased by 40% at the beginning and decreased towards the end of the light period. The glutamine : 2-oxoglutarate ratio was steady during the first part of the light period and increased markedly during the second part of the light period. The diurnal changes of the NIA transcript level were inversely correlated to the diurnal changes of malate, and unrelated to the changes of 2-oxoglutarate or the glutamine : 2-oxoglutarate ratio. The decrease of NIA activity in the second part of the light period correlated with an increase of the glutamine : 2-oxoglutarate ratio. (ii) Leaves were detached 4 h into the light period and supplied with malate or 2-oxoglutarate via the petiole, to investigate their impact on the gradual decrease of the NIA transcript and NIA activity during the second part of the light period. Physiologically relevant changes of malate led to a further decrease of the NIA transcript level and a 27–60% decrease of NIA activity. A large increase of 2-oxoglutarate stabilized the NIA transcript level but had only slight effects on NIA activity. (iii) Plants were darkened for 16–24 h to reduce the NIA transcript level and NIA activity to low levels, and leaves were then detached and supplied with malate or 2-oxoglutarate for 4 h in the light to investigate their impact on the light-induction of NIA. The increase of the NIA transcript and NIA activity was antagonized by malate, and slightly accelerated by 2-oxoglutarate. (iv) Plants were placed in the dark for 60 h to reduce NIA activity to the limit of detection, and leaf discs were then incubated in the dark on sucrose to achieve a photosynthesis-independent increase of NIA activity. This was strongly inhibited by malate. (v) It is concluded that malate inhibits NIA expression, affecting both the NIA transcript level and NIA activity. Although the results are consistent with a role for 2-oxoglutarate in the regulation of NIA expression, the impact is less marked and no endogenous changes of 2-oxoglutarate were found that are likely to have a significant effect on NIA expression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.2001.00664.x
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  • 6
    Electronic Resource
    Electronic Resource
    Contact allergy to a synthetic tannin in Tannosynt® liquid (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Contact dermatitis 31 (1994), S. 0 
    Details
    ISSN: 1600-0536
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0536.1994.tb01964.x
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  • 7
    Electronic Resource
    Electronic Resource
    Multi-colour organic light-emitting displays by solution processing (2003)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 421 (2003), S. 829-833 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Organic light-emitting diodes (OLEDs) show promise for applications as high-quality self-emissive displays for portable devices such as cellular phones and personal organizers. Although monochrome operation is sufficient for some applications, the extension to multi-colour devices—such as ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature01390
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  • 8
    Electronic Resource
    Electronic Resource
    Autoantibodies Against Ganglioside GM3 Represent a Portion of Anti-Lymphocyte Antibodies in AIDS Patients (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Scandinavian journal of immunology 40 (1994), S. 0 
    Details
    ISSN: 1365-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: In this study we analysed the relationship between anti-lymphocytic ganglioside antibodies and anti-lymphocyte antibodies in AIDS patients. Anti-lymphocytic ganglioside antibodies were detected by thin layer chromatography (TLC) immunostaining; three colour flow cytometry was used to analyse circulating antibodies against different lymphocyte subsets.Anti-lymphocytic ganglioside antibodies were detected in 23 out of 49 AIDS patient sera (46.9%). All positive sera reacted selectively with the GM3 comigrating band from AIDS lymphocytes. Twenty two out of the 23 anti-lymphocytic GM3 positive sera also had antibodies against CD4+ T cells, versus 17/26 anti-GM3 negative. Furthermore, patients with lymphocytic GM3 antibodies showed a significantly higher antibody reactivity against CD4+ T cells than patients in which these antibodies were not detected. The absorption tests revealed that preincubation of positive sera with GM3 was followed by a decrease in the reaction with target lymphocytes.These findings suggest that anti-GM3 antibodies are a portion, but not the majority, of antibodies reacting with CD4+ T cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3083.1994.tb03436.x
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  • 9
    Electronic Resource
    Electronic Resource
    Properties of Zn-Ni alloy deposits from ammonium baths (1994)
    Springer
    Journal of applied electrochemistry 24 (1994), S. 1249-1255 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Zinc-nickel alloys have been electrodeposited from a simple bath containing only zinc, nickel and ammonium chlorides. The composition, morphology, structure and corrosion resistance of the alloys obtained with this bath have been studied and the influence of some additives, normally used to reduce the stress of the deposits, has also been analysed. Among these additives it has been found that the aromatic sulfonimide does not significantly modify the deposit characteristics but improves the corrosion resistance of the alloys. Moreover, the applicability of two statistical methods to a deposition process has been tested, to obtain the main factor determining the deposit composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00249889
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  • 10
    Electronic Resource
    Electronic Resource
    Electrochemical nucleation of nickel on vitreous carbon electrodes: the influence of organic additives (1991)
    Springer
    Journal of applied electrochemistry 21 (1991), S. 709-715 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The initial stages of the electrodeposition of nickel onto vitreous carbon from ethanol/water chloride solutions was studied in the presence and absence of some organic compounds. The influence of both additives and metal concentration was investigated by cyclic voltammetry, potential step experiments and differential capacity measurements. The role of the additives in the deposition process related to their adsorption, both on vitreous carbon and on vitreous carbon/nickel deposited electrodes, is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01034050
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