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  • 1
    Electronic Resource
    Electronic Resource
    Fast and simple identification of adipose tissues in situ with dithizonDedicated to Dr. F. X. Hausberger in honor of his 65th birthday. (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 180 (1974), S. 341-350 
    Details
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Minute amounts of white or brown adipose tissue can be localized in situ within seconds by covering the organ surfaces with an alkaline solution of dithizon (diphenylthiocarbazone) in alcohol and water. The adipose tissues stain deep green, while the other organs remain unstained, or appear in various shades of pink and red. This technique has been successfully applied to various groups of vertebrates (mammals, birds, reptiles, amphibians and fishes), and it works in fresh, in deep frozen and in formalin-fixed specimens. It fails after tissue fixation in mercuric chloride-containing fluids. In vitro studies show that the staining reaction is due to (1) a preferential solubility of small amounts of dithizon in adipose tissue lipids, and (2) the development of a green color, which appears when dithizon dissolves in lipids or organic solvents.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ar.1091800208
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    Paper (German National Licenses)
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  • 2
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    Ionospheric Sounding Using Real-Time Amateur Radio Reporting Networks (2014)
    Wiley-Blackwell
    Details
    Publication Date: 2014-10-24
    Description: Amateur radio reporting networks, such as the Reverse Beacon Network (RBN), PSKReporter, and the Weak Signal Propagation Network, are powerful tools for remote sensing the ionosphere. These voluntarily constructed and operated networks provide real-time and archival data that could be used for space weather operations, forecasting, and research. The potential exists for the study of both global and localized effects. The capability of one such network to detect space weather disturbances is demonstrated by examining the impacts on RBN-observed HF propagation paths of an X2.9 class solar flare detected by the GOES 15 satellite. Prior to the solar flare, the RBN observed strong HF propagation conditions between multiple continents, primarily Europe, North America, and South America. Immediately following the GOES 15 detection of the solar flare, the number of reported global RBN propagation paths dropped to less than 35% that of prior observations. After the flare, the RBN showed the gradual recovery of HF propagation conditions
    Print ISSN: 1539-4964
    Electronic ISSN: 1542-7390
    Topics: Geosciences , Physics
    Published by Wiley-Blackwell on behalf of American Geophysical Union (AGU).
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  • 3
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    Ecological processes dominate the 13C land disequilibrium in a Rocky Mountain subalpine forest (2014)
    Wiley-Blackwell
    Details
    Publication Date: 2014-03-14
    Description: Fossil fuel combustion has increased atmospheric CO 2 by ≈ 115 µmol mol -1 since 1750, and decreased its carbon isotope composition (δ 13 C) by 1.7-2 ‰ (the 13 C Suess effect). Because carbon is stored in the terrestrial biosphere for decades and longer, the δ 13 C of CO 2 released by terrestrial ecosystems is expected to differ from the δ 13 C of CO 2 assimilated by land plants during photosynthesis. This isotopic difference between land-atmosphere respiration (δ R ) and photosynthetic assimilation (δ A ) fluxes gives rise to the 13 C land disequilibrium (D). Contemporary understanding suggests that over annual and longer time scales, D is determined primarily by the Suess effect, and thus D is generally positive (δ R  〉 δ A ). A seven-year record of biosphere-atmosphere carbon exchange was used to evaluate the seasonality of δ A and δ R , and the 13 C land disequilibrium, in a subalpine conifer forest. A novel isotopic mixing model was employed to determine the δ 13 C of net land-atmosphere exchange during day and night, and combined with tower-based flux observations to assess δ A and δ R . The disequilibrium varied seasonally, and when flux-weighted was opposite in sign than expected from the Suess effect (D = -0.75 ± 0.21 ‰ or -0.88 ± 0.10 ‰ depending on method). Seasonality in D appeared to be driven by photosynthetic discrimination (Δ canopy ) responding to environmental factors. Possible explanations for negative D include: 1) changes in Δ canopy over decades as CO 2 and temperature have risen, and/or 2) post-photosynthetic fractionation processes leading to sequestration of isotopically-enriched carbon in long-lived pools like wood and soil.
    Print ISSN: 0886-6236
    Electronic ISSN: 1944-9224
    Topics: Biology , Chemistry and Pharmacology , Geography , Geosciences , Physics
    Published by Wiley-Blackwell on behalf of American Geophysical Union (AGU).
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