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  • 1
    Electronic Resource
    Electronic Resource
    Facile interconversion of arene- and cyanocyclohexadienylmanganese complexes (1971)
    s.l. : American Chemical Society
    Inorganic chemistry 10 (1971), S. 404-405 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic50096a043
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  • 2
    Electronic Resource
    Electronic Resource
    GaAs/GaSb strained-layer heterostructures deposited by metalorganic vapor phase epitaxy (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1241-1243 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The growth of strained GaSb/GaAs quantum wells has been attempted for the first time (7% lattice mismatch), with the antimonide layers being constrained to take on the GaAs lattice parameter in the interface plane. The critical thickness for pseudomorphic growth of the strained layer was about 15 A(ring), with further growth resulting in islands of GaSb crystallites over the wafer surface. Photoluminescence spectra and photoconductivity from both single and double wells showed a strong signal at approximately 1.3 eV, identified as a Γ point transition. This was not consistent with band structure calculations for a GaSb/GaAs well, suggesting an error in the estimation of the band offsets and/or As incorporation in the strained layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100728
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  • 3
    Electronic Resource
    Electronic Resource
    GaSb/GaInSb quantum wells grown by metalorganic vapor phase epitaxy (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 922-924 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single and multiple quantum wells of GaSb/GaInSb were grown by metalorganic vapor phase epitaxy. X-ray diffraction on an 80 A(ring) single well confirmed the Ga1−xInxSb composition to be x=0.15, for which the lattice mismatch is ≈1.0%. Photoluminescence and photoconductivity from this sample both showed a signal due to carriers in the well, the position of which was in good agreement with the calculated band diagram. Shubnikov–de Haas oscillations in the transverse magnetoresistance (ρxx) of a four-period multiquantum well, and the associated quantum Hall effect, indicated that a two-dimensional hole gas was present in one of the wells. Unusually, the strongest oscillations were seen for occupancy of an odd number of (spin split) Landau levels (ν=1,3,5,...,etc.) This sample also showed luminescence peaks at 738 and 755 meV which were attributed to recombination in the wells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100809
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetotransport of piezoelectric [111] oriented strained quantum wells (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 659-661 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the first observation of magnetotransport in piezoelectrically active heterostructures. Well-resolved quantum Hall plateaus and magnetoresistance minima are observed for two-dimensional hole gases confined in [111] oriented strained-layer Ga1−xInxSb/GaSb quantum wells with a piezoelectric field, of order 1×105 V/cm. We discuss the enhanced carrier densities induced by the in-built field and the differences observed between [111]A and [111]B orientations. Comparisons are made with simultaneously grown [001] structures. Stark energy shifts observed in photoluminescence are well accounted for by the estimated electric field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105356
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  • 5
    Electronic Resource
    Electronic Resource
    Organization of Function in Trypanosome Flagella (1961)
    [s.l.] : Nature Publishing Group
    Nature 189 (1961), S. 1017-1018 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Acridine derivatives are well known to produce photosensitivity in cells and tissues. In the presence of pure" 2: 8-diamino-N-methylacridinium chloride (acriflavine) trypanosomes respond to light of wavelength 430-465 mjA first by an increased motility, secondly, by a stiffening of the flagellum ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1891017a0
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  • 6
    Electronic Resource
    Electronic Resource
    Particulate Localization of Acid Phosphatase in Fungi (1967)
    [s.l.] : Nature Publishing Group
    Nature 215 (1967), S. 783-784 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Botrytis cinerea Fr. was grown on covershps for 2 days at 25 C on disks of malt extract agar. The disks were removed and the unfixed tissue adhering to the coverslips was used directly or after fixation for 1.5 h at 0-4 C in cold acetone. The Gomori3 lead nitrate method gave excellent results with ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/215783a0
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  • 7
    Electronic Resource
    Electronic Resource
    Antigenicity of Trypanosome Nuclei : Evidence that DNA is not coupled to Histone in these Protozoa (1964)
    [s.l.] : Nature Publishing Group
    Nature 204 (1964), S. 194-195 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Several strains of trypanosomes were examined. Blood forms were available in smears of blood from rats infected with Trypanosoma gambiense, T. rhodesiense, T. rhodesiense 200, T. cruzi, T. congolense, T. congolense J71, T. equiper-dum, T. evansi S.A.K. and T. lewisi. Cultures of T. rhodesiense, T. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/204194a0
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  • 8
    Electronic Resource
    Electronic Resource
    The effects of ultraviolet irradiation on P680+ reduction in PS II core complexes measured for individual S-states and during repetitive cycling of the oxygen-evolving complex (1996)
    Springer
    Photosynthesis research 49 (1996), S. 21-27 
    Details
    ISSN: 1573-5079
    Keywords: Photosystem II core complex ; P680+ reduction kinetics ; S-state ; ultraviolet radiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Flash-induced absorbance measurements at 830 nm on both nanosecond and microsecond timescales have been used to characterise the effect of ultraviolet light on Photosystem II core particles. A combination of UV-A and UV-B, closely simulating the spectrum of sunlight below 350 nm, was found to have a primary effect on the donor side of P680. Repetitive measurements indicated reductions in the nanosecond components of the absorbance decay with a concomitant appearance and increase in the amplitude of a component with a 10 μs time constant attributed to slow reduction of P680+ by Tyrz when the function of the oxygen evolving complex is inhibited. Single-flash measurements show that the nanosecond components have amplitudes which vary with S-state. Increasing UV irradiation inhibited the amplitude of these components without changing their S-state dependence. In addition, UV irradiation resulted in a reduction in the total amplitude, with no change in the proportion of the 10 μs contribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00029424
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  • 9
    Electronic Resource
    Electronic Resource
    P680+ reduction in oxygen-evolving Photosystem II core complexes (1996)
    Springer
    Photosynthesis research 49 (1996), S. 209-221 
    Details
    ISSN: 1573-5079
    Keywords: Photosystem II ; core particle ; P680 ; 830 nm transient absorption ; S-states ; oxygen-evolving complex
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The kinetics of P680+ reduction in oxygen-evolving spinach Photosystem II (PS II) core particles were studied using both repetitive and single-flash 830 nm transient absorption. From measurements on samples in which PS II turnover is blocked, we estimate radical-pair lifetimes of 2 ns and 19 ns. Nanosecond single-flash measurements indicate decay times of 7 ns, 40 ns and 95 ns. Both the longer 40 ns and 95 ns components relate to the normal S-state controlled Yz → P680+ electron transfer dynamics. Our analysis indicates the existence of a 7 ns component which provides evidence for an additional process associated with modified interactions involving the water-splitting catalytic site. Corresponding microsecond measurements show decay times of 4 μs and 90 μs with the possibility of a small component with a decay time of 20–40 μs. The precise origin of the 4 μs component remains uncertain but appears to be associated with the water-splitting center or its binding site while the 90 μs component is assigned to P680+-QA − recombination. An amplitude and kinetic analysis of the flash dependence data gives results that are consistent with the current model of the oxygen-evolving complex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00034782
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  • 10
    Electronic Resource
    Electronic Resource
    Some mechanical property and fracture studies of carbon fibre/nickel composites (1971)
    Springer
    Journal of materials science 6 (1971), S. 419-426 
    Details
    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 A carbon fibre reinforced nickel composite has been fabricated, and some of the mechanical properties investigated. The composite contains some misaligned and broken fibres, and a poor bond exists between the carbon fibre and the nickel. The mechanical properties are, to a very large extent, influenced by these factors. The oxidation resistance was found to be poor, and therefore a serious limitation for high temperature use.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02403062
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