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  • 1
    Electronic Resource
    Electronic Resource
    Carbon Determination in Biological Material with Persulfate Oxidation Method (1957)
    s.l. : American Chemical Society
    Analytical chemistry 29 (1957), S. 1225-1226 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60128a038
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  • 2
    Electronic Resource
    Electronic Resource
    Strained InGaAs/GaPAsSb heterostructures grown on GaAs (001) for optoelectronic applications in the 1100–1550 nm range (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 3004-3014 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present a novel semiconductor quantum well (QW) structure consisting of alternating (In,Ga)As and Ga(P,As,Sb) layers grown pseudomorphically on a GaAs substrate by all-solid-source molecular beam epitaxy. The band gap of the QW is determined by the thickness and composition of both types of layers and can be varied from 1.1 to 1.55 μm. Calculations show that the observed strong room-temperature photoluminescence in this wavelength range can be explained by a type-II transition in the QW. Structural investigations by reflection high-energy electron diffraction, transmission electron microscopy, and secondary ion mass spectroscopy confirm a triple layer structure with laterally modulated composition. Photoluminescence measurements reveal a linewidth of 50 meV at 1.3 μm and a luminescence decay time of 240 ps. Our investigations demonstrate the feasibility of this materials system for vertical cavity surface-emitting lasers and other optoelectronic devices on GaAs. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1287233
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  • 3
    Electronic Resource
    Electronic Resource
    Long wavelength (1.3 and 1.5 μm) photoluminescence from InGaAs/GaPAsSb quantum wells grown on GaAs (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 1267-1269 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Room temperature photoluminescence at wavelengths between 1.2 and 1.5 μm has been observed in samples consisting of InGaAs/GaPAsSb quantum well structures grown on GaAs. The emission wavelength is varied primarily by changing the composition within the GaPAsSb layer. It is proposed that such long wavelength emission results from a spatially indirect interband transition in the type-II quantum wells where the electron and hole wave functions have large spatial overlap. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124663
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of annealing of Ag ultrathin films on Co/Pt(111) surface (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 228-232 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Low-energy electron diffraction was used to study the annealing effects of Ag ultrathin films on the surface of one monolayer Co/Pt(111). The intensity of the specular beam versus temperature has an unusual minimum point and maximum point. Further studies by Auger electron spectroscopy indicate that the adatoms of Ag become a best ordered state after the formation of Co–Pt alloy is complete. The new order state comes from the structure change of Co/Pt(111) and the smaller lattice mismatch between Ag and Pt. The electron density of states of d band shifts to a lower binding energy when the system starts to form the Co–Pt alloy measured by ultraviolet photoelectron spectroscopy. The chemical compositions at interfaces of the thin film were investigated by a depth profile before and after the annealing. The sputtering rates of Ag on the topmost layer of the unannealed film and the annealed film were calculated and comparatively studied. A shadow effect causes the different sputtering rates of these two ultrathin films. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369475
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  • 5
    Electronic Resource
    Electronic Resource
    Derivation of a pluripotent embryonic cell line from red sea bream blastulas (2003)
    Oxford, UK : Blackwell Science Ltd
    Journal of fish biology 63 (2003), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A pluripotent cell line, sea bream embryonic stem-like cells (SBES1), was developed from blastula-stage embryos of the cultured red sea bream, Chrysophrys major. The SBES1 cells were cultivated in Dulbecco's modified eagles medium (DMEM) medium supplemented with foetal bovine serum, marine fish serum, fish embryo extract, selenium, basic fibroblast growth factor and leukemia inhibitory factor. They were small and round or polygonal, and grew actively and stabely in culture. The cells exhibited a positive alkaline phosphatase activity upon histochemical staining. When the cells were treated with all-trans retinoic acid, they differentiated into various types including neuron-like, neuroglia-like and muscle-like cells, suggesting that the SBES1 cells remained pluripotent in culture. Chromosome analysis revealed that SBES1 cells had a normal diploid karyotype with 2n = 2st + 46t. At present, SBES1 cells have been cultured for 〉180 days with more than 60 passages. High survival rate has been obtained after cryopreservation of cell cultures. This embryonic cell line may potentially be used for the production of transgenic red sea bream.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1095-8649.2003.00192.x
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  • 6
    Electronic Resource
    Electronic Resource
    Auto-Oxidation of Extractable Color Pigments in Chili Pepper with Special Reference to Ethoxyquin Treatment (1968)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 33 (1968), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: SUMMARY— Deterioration of extractable color pigments in dehydrated, ground chili peppers during storage was shown to be an auto-oxidative process having the kinetics of a second order reaction. Consequently, the reaction rate constant, k21 was used to evaluate the effect of a number of variables, such as moisture content, storage atmosphere and ethoxyquin treatment. In an oxygen-containing atmosphere, the rate constants for color deterioration varied with moisture content. The k2 value was 2 to 3 times higher at 4 to 5% moisture content than at 8 to 9%. Treatment with 100 ppm ethoxyquin afforded both substantial protection against color deterioration and an improvement of the surface color of the paprika in storage. Such treatment was most effective in low-moisture chili peppers. The color stability of several varieties was compared under controlled conditions. Some varieties were found to be more stable than others.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1968.tb01366.x
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  • 7
    Electronic Resource
    Electronic Resource
    An Antibiotic Substance in the Chinese Water-chestnut, Eleocharis tuberosa (1945)
    [s.l.] : Nature Publishing Group
    Nature 156 (1945), S. 234-234 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN our search for the presence of antibiotic substances in the higher plants used in China for food or for drugs, we have examined the tubers of the waterchestnut, Eleocharis tuberosa. The waterchestnuts, bought in the local market, were washed and crushed in a Carver laboratory hydraulic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/156234b0
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  • 8
    Electronic Resource
    Electronic Resource
    Energy Requirement for Microbial Growth (1964)
    [s.l.] : Nature Publishing Group
    Nature 202 (1964), S. 1135-1136 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the determination of growth yield, whether expressed per mole of energy substrate or per mole of ATP formed, it is assumed that almost all the substrate added was catabolized to furnish energy; little was synthesized into cellular matter. These conditions may be fulfilled under anaerobic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2021135b0
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  • 9
    Electronic Resource
    Electronic Resource
    The determination of the orientation of anthracene molecules in the unit cell by a refractivity method (1986)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 42 (1986), S. 137-139 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The monoclinic anthracene crystal is used as an example to demonstrate the feasibility of optimizing the orientation of molecules in the unit cell by matching calculated and experimental refractivity ellipsoids using a simplex algorithm. The calculated refractivity ellipsoid is determined by use of an empirical formula using bond directional polarizabilities. Optimization of the molecular orientations to provide the best fit to the experimental ellipsoid starting from several assumed orientations results in fits for which the maximum deviation from the experimental molecular orientation was no more than 10°. The method can be applied to other monoclinic molecular crystals directly and could be extended to other crystal systems with anisotropic optical properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767386099634
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  • 10
    Electronic Resource
    Electronic Resource
    Correlating the optical rotation of α-quartz with a skew matrix of a dielectric tensor (1993)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 49 (1993), S. 148-154 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A beam of polarized light propagating along the helical axis of α-quartz interacts with SiO4/2 groups consecutively. When a skew matrix of a resultant dielectric tensor is compared to a skew matrix of a rotation matrix, the polarizability components of an SiO4/2 group, with two sets of results, may be derived since the specific rotation along the helical axis is known for 5892.9 Å light at 293 K. Both sets have the same mean value for the components. The mean is close to an empirical result based on the bond refractivity of Si–O. In comparison with the optical rotation sign (+ or −) along the optic axis, an opposite rotation sign is derived along the directions perpendicular to both the optic axis and any diad axis. In α-quartz, the inactive directions 33.83° from its optic axis are interpreted. The diad-axis directions are predicted to be inactive directions. Bunn's empirical formula is interpreted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767392008262
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