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  • 1
    Electronic Resource
    Electronic Resource
    Formation of fibrous molecular assemblies by amino acid surfactants in water (1992)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 114 (1992), S. 3414-3419 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00035a038
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  • 2
    Electronic Resource
    Electronic Resource
    Photoinduced reactions. 97. Polar peroxidic intermediates in low temperature photooxygenation of N-methylindoles (1977)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 99 (1977), S. 2005-2006 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00448a068
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  • 3
    Electronic Resource
    Electronic Resource
    Enhancement of high-energy cosmic-ray spectrum by type-II supernovae (1986)
    [s.l.] : Nature Publishing Group
    Nature 321 (1986), S. 839-841 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The high-energy enhancement in the cosmic-ray spectrum has been suspected to result from rays originating from pulsars2'4. For example, Karakura et al2 explained the feature in the extensive air shower (EAS) energy spectrum in terms of proton-dominated pulsar contributions using the electromagnetic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/321839a0
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  • 4
    Electronic Resource
    Electronic Resource
    Total amount of oceanic excess CO2 taken from the North Pacific subpolar region (1996)
    Springer
    Journal of oceanography 52 (1996), S. 301-312 
    Details
    ISSN: 1573-868X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Concentrations of total carbonate, alkalinity and dissolved oxygen were obtained near the 1973 GEOSECS stations in the North Pacific subpolar region north of 40°N along 175°E between 1993 and 1994. A difference of excess CO2 content between the GEOSECS and our expeditions was estimated. The maximum difference in water column inventory of excess CO2 has increased by about 280 gC m−2 above 2000 m depth which apparently means an uptake of excess CO2 taken from air to sea during the last two decades. An averaged value of the annual flux of excess CO2 at 75–1000 m depth was 8.63±2.01 gC m−2yr−1 in the North Pacific subpolar region. By introducing the annual flux of excess CO2 into a two-box model for the North Pacific subpolar region, a penetration factor of excess CO2 from air to sea was obtained to be 1.08×10−2 gC m−3ppm−1 in the North Pacific subpolar region. Based on this factor, the surface concentration of excess CO2 in the North Pacific subpolar region was estimated to be 68 μmole I−1, suggesting that the North Pacific subpolar region absorbed atmospheric excess CO2 more than the saturated concentration of excess CO2. Total amount of excess CO2 taken from the North Pacific subpolar region by 1993 was estimated to be 36.2×1015 gC, which was equal to about one tenth of that released by human activities after the preindustrial era.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02235925
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  • 5
    Electronic Resource
    Electronic Resource
    Direct evidence for ferroelectric switching in poly(vinylidene fluoride) and poly(vinylidene fluoride-trifluoroethylene) crystals (1987)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 25 (1987), S. 153-159 
    Details
    ISSN: 0887-6258
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1987.140250402
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  • 6
    Electronic Resource
    Electronic Resource
    Photocatalytic production of hydrogen peroxide using polymer bound anthraquinone. I. Photoproducts in 2-hydroxyethyl methacrylate hydrogels swollen with water and 2-propanol (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 257-269 
    Details
    ISSN: 0887-624X
    Keywords: anthraquinone ; hydrogen peroxide ; hydrogel ; anthrahydroquinone ; 10-hydroxyanthrone ; water ; 2-propanol ; polymer-bound photocatalyst ; thin film ; solar photolysis ; hydroxylated anthraquinone ; phototautomerization ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Photoreductions of polymer-bound anthraquinone in degassed water- and 2-propanolswollen 2-hydroxyethyl methacrylate hydrogel films were performed at 313 and 334 nm, and in sunlight for the water-swollen system. The quantum yield at 334 nm for production of anthrahydroquinone was 0.31 in water and 0.94 in 2-propanol. Results at 313 nm were very similar. A reversible oxygen insensitive side product, indentified as 10-hydroxyanthrone, was produced simultaneously to the anthrahydroquinone in water-swollen films, but not for 2-propanol. A small amount of irreversible side product, believed to be hydroxylated anthraquinone, was also formed in the water system. A photochemical reaction scheme is suggested to account for these observations. Hydrogen peroxide production from photoreduction-reoxidation cycling of the hydrogels is reported.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1992.080300210
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  • 7
    Electronic Resource
    Electronic Resource
    New cell types of the pancreatic islets in the crucian carp,Carassius carassius (1973)
    Springer
    Cell & tissue research 146 (1973), S. 425-438 
    Details
    ISSN: 1432-0878
    Keywords: Pancreatic islets ; New cell types ; Teleost ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The pancreatic islets ofCarassius carassius have been studied by electron microscopy. 1. Besides A-, B- and D-cells, two new cell types, the fourth and the fifth, have been identified. The fourth cell type is numerous; it occurs interposed among the other types of islet cells or in small clusters. The secretory granules (90–280 mg in diameter) are round or oval and usually with much lower electron density than α- and δ-granules. The secretory granules of the fifth type of cell (approximately 140–240 mμ in diameter) contain finely granular material and an electron dense core that is round or often tetra- or hexagonal. 2. The islet cells with clear cytoplasmic matrix generally contain large numbers of fine, agranular and cored vesicles 400–680 Å in diameter. They appear, in bead-like chains, or randomly scattered throughout the cytoplasm, or often clustered in aggregates close to the secretory granules and show evidence of incorporation into the secretory granules. The two types of vesicles may be formed by constriction or pinching-off of the tubular smooth endoplasmic reticulum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02346233
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  • 8
    Electronic Resource
    Electronic Resource
    Light and electron microscopic study on the endocrine cells of the pancreas in a marine teleost, Fugu rubripes rubripes (1976)
    Springer
    Cell & tissue research 174 (1976), S. 161-182 
    Details
    ISSN: 1432-0878
    Keywords: Pancreatic islets ; Teleost ; Fugu rubripes rubripes ; Cell types ; Secretory granules
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The pancreatic endocrine tissue of Fugu rubripes rubripes consists of numerous round principal islets (Brockmann bodies) of various sizes scattered around the gall-bladder. The endocrine cells are divided into A-, B-, D-, and Ff-cells. Each cell type was identified by comparing thick and thin sections in both light and electron microscopy. Aldehyde-fuchsin positive B-cells contain numerous round secretory granules (average diameter 300 nm) each of which has a round compact core of moderate density; a narrow space exists between this core and the limiting membrane. Grimelius' silver positive A cells contain round secretory granules (average diameter 360 nm) with a hexagonal or tetragonal crystalline core (average diameter 170 nm) of high density; the silver grains preferentially appear in the space between the limiting membrane and the core. The crystalline core of each α-granule often contains an appendix-like structure of variable shape. D cells blackened by the silver impregnation method of Hellman and Hellerström (1960) have round secretory granules (average diameter 320 nm) filled with a flocculent material of low density. The fourth cell type (Ff-cell) has a clear cytoplasm after differential staining for light microscopy. By electron microscopy, this cell has elongated fusiform secretory granules (520 nm average length × 230 nm average width) filled with numerous filaments arranged in parallel with the longitudinal axis. Figures suggesting granule formation in the sacs of the Golgi apparatus were obtained in all of islet cell types. Equivalents of emiocytotic release of secretory granules were encountered in the A and Ff cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222157
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of equilibration period on the viability of frozen-thawed mouse morulae after rapid freezing (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Molecular Reproduction and Development 26 (1990), S. 105-110 
    Details
    ISSN: 1040-452X
    Keywords: Embryo ; Glycerol ; Lactose ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Mouse morulae were frozen with 1.5-4.0 M glycerol + 0.25 M lactose solution by direct plunging into liquid nitrogen vapor 0.5-30 min after equilibration at room temperature. After thawing, embryos were cultured in vitro, and the highest survival rates were obtained after exposure for 3 min at 3.0 and 4.0 M and for 5 min at 1.5 and 2.0 M glycerol levels. Significant reductions in the survival rates (P 〈 0.05) were observed when equilibration periods were extended for 3-5 min at 3.0 and 4.0 M and for 5-10 min at 1.5 and 2.0 M glycerol levels. These results clearly demonstrate that the equilibration time of embryos in glycerollactose mixture is one of the most important factors in the present rapid freezing conditions. To clarify the factors that lower embryo viability after prolonged equilibration, we performed further experiments on the effects of exposure to glycerol-lactose mixture on the developmental potential of embryos without freezing and on the volume changes of embryos during the exposure to glycerol solution with or without lactose. It was suggested that the detrimental effects of prolonged equilibration are due not only to the toxicity and osmotic injury of higher concentrations of cryoprotectant solution but also to the influx of water into embryonic cells caused by the hypotonic salt concentration of the extracellular (freezing) solution.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1080260203
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  • 10
    Electronic Resource
    Electronic Resource
    The search for cosmic strangelets with the supersonic concorde and with JACEE's circumpolar balloon flight in Antarctica (1996)
    Springer
    Hyperfine interactions 103 (1996), S. 99-111 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The search for cosmic strangelet nuclei was carried out by two experiments with emulsion chambers. A balloon-borne JACEE emulsion chamber was flown at 3.5 g/cm2 for 200 h in Antarctica (JACEE-10 experiment) and the Concorde flights were made by ECHOS at an atmospheric depth of 110 g/cm2 between Paris and New York. No nuclei withZ⩾30 survived after traversing 60–120 g/cm2 of the detector materials in the JACEE instruments. No evidence for a long mean free path were found in the zenith angle distribution forZ/β⩾26 nuclei. The exposure factor used by the JACEE was 72 m2hsr. The intensity upperbounds,I⩽(2.2–9.7)×10−2/m2h sr, were obtained for strangelets having an atmospheric attenuation length of 220−50 g/cm2, which corresponds to the case for mass numberA=100–10000 andZ/β 〉 13. Concorde experiments (ECHOS) used both a thin and a thick emulsion chamber. The total exposure was 209 m2 h sr and no candidates with chargeZ⩾30 were found. The largest track hadZ/β=28.6±1.29 withβ ∼ 1. Nuclei observed with charge 13⩽Z⩽30 were consistent with the survival intensity of ordinary nuclei. The flux bounds from the ECHOS experiments were I⩽(2.1–5.0) x 10−2/m2h for strangelets with mass number 100⩽A⩽1000.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02317346
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