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  • 1
    Unknown
    Supercontinent Cycles Through Earth History (2016)
    London : The Geological Society
    Details
    Description / Table of Contents: The supercontinent-cycle hypothesis attributes planetary-scale episodic tectonic events to an intrinsic self-organizing mode of mantle convection, governed by the buoyancy of continental lithosphere that resists subduction during the closure of old ocean basins, and the consequent reorganization of mantle convection cells leading to the opening of new ocean basins. Characteristic timescales of the cycle are typically 500 to 700 million years. Proposed spatial patterns of cyclicity range from hemispheric (introversion) to antipodal (extroversion), to precisely between those end members (orthoversion). Advances in our understanding can arise from theoretical or numerical modelling, primary data acquisition relevant to continental reconstructions, and spatiotemporal correlations between plate kinematics, geodynamic events and palaeoenvironmental history. The palaeogeographic record of supercontinental tectonics on Earth is still under development. The contributions in this Special Publication provide snapshots in time of these investigations and indicate that Earth's palaeogeographic record incorporates elements of all three end-member spatial patterns.
    Pages: Online-Ressource (297 Seiten)
    ISBN: 9781862397330
    URL: http://sp.lyellcollection.org/content/424/1
    Language: English
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    E-BOOK
  • 2
    Electronic Resource
    Electronic Resource
    Determination of Dimethyl Sulfoxide in Plasma and Cerebrospinal Fluid by Gas-Liquid Chromatography. (1966)
    s.l. : American Chemical Society
    Analytical chemistry 38 (1966), S. 651-652 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60236a039
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  • 3
    Electronic Resource
    Electronic Resource
    Post-orogenic exhumation of an auriferous terrane: the paleoplacer potential of the Early Carboniferous St. Marys Basin, Canadian Appalachians (2000)
    Springer
    Mineralium deposita 35 (2000), S. 776-790 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The St. Marys Basin of mainland Nova Scotia, Canada, consists of Late Devonian–Early Carboniferous clastic rocks of the Horton Group deposited in the waning stages of the ca. 420–360 Ma Acadian orogeny in the Canadian Appalachians. Clast lithologies and lithogeochemical analyses indicate that the detritus was predominantly derived from the Meguma terrane that occurs to the south of the basin. The Meguma terrane contains abundant mesothermal gold deposits that are coeval with peak magmatic activity from ca. 380 to 370 Ma and underwent rapid uplift and erosion between ca. 370 and 360 Ma. Within the St. Marys Basin, the contact between the lacustrine Little Stewiacke River Formation and the fluviatile Barrens Hills Formation is interpreted to represent a shoreline and a potentially favorable environment for depositing paleoplacer gold. Geochemical analyses of lithologies adjacent to this contact indicate that the siltstones are predominantly derived from Meguma terrane metasedimentary rocks, whereas the sandstones and conglomerates are predominantly derived from Meguma terrane granitoids. Geochemical and mineralogical analysis indicate the accumulation of heavy minerals including zircon and gold. Micron-scale (〈150 μm) gold identified in the matrix of the conglomerates has a “nuggety” appearance and flakey microtexture indicative of a detrital origin. This observation indicates that the mesothermal deposits were exhumed by the latest Devonian, consistent with regional tectonic syntheses that invoke rapid uplift of the Meguma terrane following peak orogenic activity. This study suggests that favorable depositional environments for paleoplacer deposits may occur in Horton Group rocks that are derived from the Meguma terrane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001260050279
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  • 4
    Electronic Resource
    Electronic Resource
    The superconducting x-ray lithography source program at Brookhaven (invited) : International conference on synchrotron radiation instrumentation (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 1628-1629 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A compact electron storage ring with superconducting dipole magnets, is being developed at the National Synchrotron Light Source at Brookhaven. The parameters of the source have been optimized for its future use as an x-ray source for lithography. This first ring is a prototype which will be used to study the operating characteristics of machines of this type with particular attention being paid to low-energy injection and long beam lifetime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141046
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  • 5
    Electronic Resource
    Electronic Resource
    ALTERATIONS OF GENETIC MATERIAL FOR ANALYSIS OF ALCOHOL DEHYDROGENASE ISOZYMES OF DROSOPHILA MELANOGASTER (1968)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 151 (1968), 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.1749-6632.1968.tb11907.x
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  • 6
    Electronic Resource
    Electronic Resource
    A Nod factor-binding lectin is a member of a distinct class of apyrases that may be unique to the legumes (1999)
    Springer
    Molecular genetics and genomics 262 (1999), S. 261-267 
    Details
    ISSN: 1617-4623
    Keywords: Key words Nod factor binding ; Lectin ; Apyrase ; Legume
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Recent studies from our laboratory have found that a root lectin from the legume Dolichos biflorus is present on the root surface, binds rhizobial Nod factor and has apyrase activity. To assess the broader significance of this lectin/nucleotide phosphohydrolase (Db-LNP), we have cloned a second related cDNA (Db-apyrase-2) from D. biflorus, as well as related cDNAs from the legumes Lotus japonicus and Medicago sativa, and from Arabidopsis thaliana, a non-legume. The deduced amino acid sequences of these apyrases were aligned with one another and with the sequences of other apyrases from plants, animals, yeast and protozoa. Phylogenetic analysis shows that Db-LNP has closely related orthologs only in other legumes, while Db-apyrase-2 is more closely related to apyrase sequences from non-leguminous plants. We also show that the orthologs of Db-LNP from M. sativa and Pisum sativum have carbohydrate binding activity. The results suggest that legume LNPs may represent a special class of apyrases that arose by gene duplication and subsequent specialization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004380051082
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of Tranylcypromine on the Blood Pressure Response of Tyramine (1965)
    [s.l.] : Nature Publishing Group
    Nature 206 (1965), S. 311-312 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In our work, modification of the blood pressure response to tyramine, l,l-dimethyl-4-phenyl piperazinium iodide (DMPP), noradrenaline and adrenaline has been accomplished by the pretreatment of dogs (1012 kg), cats (22.5 kg) and rabbits (23.5 kg) with tranylcypromine. Experiments were carried out ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/206311b0
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  • 8
    Electronic Resource
    Electronic Resource
    Does Salicylic Acid Act as a Signal in Cotton for Induced Resistance to Helicoverpa zea? (1997)
    Springer
    Journal of chemical ecology 23 (1997), S. 1805-1818 
    Details
    ISSN: 1573-1561
    Keywords: Salicylic acid ; systemic acquired resistance ; hydrogen peroxide ; catalase ; ascorbate peroxidase ; signaling ; induced resistance ; herbivory ; Gossypium hirsutum ; Helicoverpa zea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Our previous study indicated that insect herbivory on cotton induced resistance to the cotton bollworm (Helicoverpa zea). Here we examine the role of salicylic acid as a signal in cotton for the induced resistance. Abundant evidence has accumulated showing that salicylic acid plays a key role in coordinating the expression of systemic acquired resistance against phyto-pathogens. We report that herbivory results in significant increases in foliar salicylic acid and H2O2, a response frequently observed following pathogenesis. In other well-studied systems (e.g., tobacco), salicylic acid inhibits the enzymatic decomposition of H2O2 by catalase and ascorbate peroxidase, but in cotton, salicylic acid has no effect on these enzymes in vitro. Furthermore, while herbivory enhances foliar catalase and ascorbate peroxidase activities, the application of salicylic acid or methyl salicylate to cotton plants does not affect foliar resistance to H. zea. The possible role of salicylic acid as a signal for induced resistance is discussed in light of these findings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/B:JOEC.0000006452.81324.b8
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  • 9
    Electronic Resource
    Electronic Resource
    Antinutritive and Oxidative Components as Mechanisms of Induced Resistance in Cotton to Helicoverpa zea (1997)
    Springer
    Journal of chemical ecology 23 (1997), S. 97-117 
    Details
    ISSN: 1573-1561
    Keywords: Oxidative stress ; nutritional stress ; induced resistance ; chlorogenic acid ; insect–plant interactions ; herbivory ; tannins ; polyphenol oxidase ; lignin ; phenolics ; Gossypium hirsutum ; Helicoverpa zea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Induced resistance in cotton (Gossypium hirsutum) foliage and squares to herbivory by Helicoverpa zea (Lepidoptera: Noctuidae) is reported in this study. Induced resistance was indicated by decreased larval growth when larvae fed on previously damaged foliage or squares compared to the controls. Herbivory caused a significant decline in host nutritional quality as shown by a reduction in protein and most amino acids in both foliage and squares. Peroxidase, ascorbate oxidase, and diamine oxidase activities increased in both damaged foliage and squares, whereas levels of the nutritional antioxidant, ascorbate, were depressed after larval feeding. Larval feeding also markedly enhanced lipoxygenase activity and lipid peroxides in square tissues. Moreover, feeding damage altered the quantitative levels of phenolic compounds in foliage and squares. These results indicate a significant shift in the oxidative status of cotton plants following herbivory as indicated by increased oxidative enzyme activity, decreased levels of the nutritional antioxidant ascorbate, and increased levels of phenolic prooxidants (i.e., chlorogenic acid) and lipid peroxides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/B:JOEC.0000006348.62578.fd
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  • 10
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    Unknown
    Late Neoproterozoic and Early Cambrian palaeogeography: models and problems (2008)
    In:  Geological Society Special Publication 294: 9-31.
    Details
    Publication Date: 2008-02-01
    Description: We present two alternative sets of global palaeogeographical reconstructions for the time interval 615530 Ma using competing high and low-latitude palaeomagnetic data subsets for Laurentia in conjunction with geological data. Both models demonstrate a genetic relationship between the collisional events associated with the assembly of Gondwana and the extensional events related to the opening of the Tornquist Sea, the eastern Iapetus Ocean (600550 Ma), and the western Iapetus Ocean (after 550 Ma), forming a three-arm rift between Laurentia, Baltica, and Gondwana. The extensional events are probably plume-related, which is indicated in the reconstructions by voluminous mafic magmatism along the margins of palaeo-continents. The low-latitude model requires a single plume event, whereas the high-latitude model needs at least three discrete plumes. Coeval collisions of large continental masses during the assembly of Gondwana, as well as slab pull from subduction zones associated with those collisions, could have caused upper plate extension resulting in the rifted arm that developed into the eastern Iapetus Ocean and Tornquist Sea but retarded development of the western Iapetus Ocean. As a result, the eastern Iapetus Ocean and the Tornquist Sea opened before the western Iapetus Ocean.
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