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  • 1
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    The North Atlantic Igneous Province : Stratigraphy, Tectonic, Volcanic and Magmatic Processes (2002)
    London : The Geological Society
    Details
    Description / Table of Contents: The North Atlantic Igneous Province has been the subject of extensive scientific investigation over the past thirty years, with a wide field of knowledge being accumulated. Recently, recognition of the potential role of Large Igneous Provinces in affecting ocean and atmosphere systems and biotic evolutionary pathways has lead to increased interest in this province. This has been further stimulated by the expansion in the search for oil and gas in Mesozoic and Tertiary sediments along the NE Atlantic Margin. An improved understanding of the interaction between igneous and sedimentary processes is vital for the identification of potential hydrocarbon resources. The regions covered include continental margin Norway, east and west Greenland, the Faroe-Shetland Basin and the Faroe Islands themselves. The papers in this book contain new data and interpretations of North Atlantic Igneous Province magmatic processes, rift evolution, tectonics, stratigraphy (chemostratigraphy, biostratigraphy, seismic and isotope stratigraphy) and sediment dispersal. Many of the papers adopt a multidisciplinary approach to tha analysis and interpretation of complex volcanic and sedimentary sequences. These new data, and the reviews and compilations of existing data provide the reader with access to current research directions in North Atlantic Igneous Province geology.
    Pages: Online-Ressource (337 Seiten)
    ISBN: 1862391084
    URL: http://sp.lyellcollection.org/content/197/1.toc
    Language: English
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    E-BOOK
  • 2
    Electronic Resource
    Electronic Resource
    Microwave Inversion Efficiency of Orange Ruby (1963)
    [s.l.] : Nature Publishing Group
    Nature 199 (1963), S. 898-899 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. Energy-levels of Cr+++ in ruby. Magnetic field at 54 44' to C-axis (energy expressed in kMc/s) The paramagnetic spectrum of the orange ruby shows the normal Cr3+ lines and also a broad line ~ 200 gauss wide with g = 2, which is almost isotropic with respect to magnetic field direction. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/199898c0
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  • 3
    Electronic Resource
    Electronic Resource
    A genetically related response to iron deficiency stress in muskmelon (1991)
    Springer
    Plant and soil 130 (1991), S. 87-92 
    Details
    ISSN: 1573-5036
    Keywords: BPDS ; Cucumis melo L. ; EDDHA ; ferric reduction ; iron efficient ; iron inefficient
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A mutant muskmelon (Cucumis melo L.) with characteristic Fe-deficiency chlorosis symptoms was compared to related cultivars in its ability to obtain Fe via the widely known Fe-stress response mechanisms of dicotyledonous plants. The three cultivars (fefe, the ‘Fe-inefficient’ mutant; Mainstream and Edisto, both ‘Fe efficient’ plants) were grown in nutrient solution in either 0 or 3.5 mg L-1 Fe as FeCl3. None of the three cultivars released ‘reductants’ or ‘phytosiderophores’, but both Edisto and Mainstream produced massive amounts of H+ ions to reduce and maintain the pH of nutrient solutions below pH 4.0. The roots of these two Fe-efficient cultivars were also capable of reducing Fe3+ to Fe2+. These responses maintained green plants, resulted in high leaf Fe in both Edisto and Mainstream, and produced Mn toxicity in Mainstream. The lack of Fe-deficiency stress response in fefe not only affected leaf Fe concentration and chlorosis, but also resulted in reduced uptake of Mn. The importance of reduced Fe (Fe2+) to the Fe-efficient cultivars was confirmed by growing the cultivars with BPDS (4, 7-diphenyl-1, 10-phenanthroline disulfonic acid, a ferrous chelator) and EDDHA [ethylene-diamine di (0-hydroxphenylacetic acid)] (a ferric chelator), and observing increased chlorosis and reduced Fe uptake in BPDS grown plants. The Fe-deficiency response observed in these cultivars points out the diversity of responses to Fe deficiency stress in plants. The fefe mutant has a limited ability to absorb Fe and Mn and perhaps could be used to better understand Mn uptake in plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00011860
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  • 4
    Electronic Resource
    Electronic Resource
    The role of active Bradyrhizobium japonicum in iron stress response of soybeans (1991)
    Springer
    Plant and soil 130 (1991), S. 225-230 
    Details
    ISSN: 1573-5036
    Keywords: Bradyrhizobium japonicum ; chlorosis ; Glycine max ; nitrogen fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The objective of this study was to identify the sites of H-ion exudation and Fe(III) reduction along both inoculated and non-inoculated roots of A7 and T203 soybeans. A split-root system was used in which half the roots of each plant were inoculated and actively fixing nitrogen and the other half were not. Expectedly, the Fe-stress response was strong on both sides of the split-root system in the +N-Fe treatment of variety A7 (inactive nodules) but not of variety T203. The Fe-stress response of A7 was enhanced by the presence of active nodules. Variety T203 is Fe inefficient and normally fails to produce any Fe-stress response, but in the absence of nitrogen and iron (−N−Fe), inoculated roots responded to Fe stress with exudation of both H-ions and reductants. Intact split-root systems were embedded in agar to determine the location of H-ion exudation and Fe(III) reduction. On the inoculated side of the −N−Fe and −N+Fe treatments (active nodules) of both soybean varieties, H-ion production was associated mainly with the active nodules. However, quantities of H-ion release were much greater under Fe stress (−N−Fe) than with adequate Fe (−N+Fe). Reduction of Fe(III) to Fe(II) was found only on the nodulated side with T203, but on both sides with A7. In variety T203 the Fe reduction was associated with younger roots located just below the nodule clusters on the inoculated side of the −N treatments. Active nodules appear to play a key role in the Fe-deficiency stress response of T203 soybean.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00011877
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  • 5
    Electronic Resource
    Electronic Resource
    Comparative evaluation of iron solubilizing substances (phytosiderophores) released by oats and corn: Iron-efficient and iron-inefficient plants (1991)
    Springer
    Plant and soil 130 (1991), S. 157-163 
    Details
    ISSN: 1573-5036
    Keywords: Avena byzantina C. Koch. ; corn ; grass ; iron efficient ; iron inefficient ; oats ; phytosiderophore ; Zea mays L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Release of phytosiderophores from barley (Hordeum vulgare L.) in response to Fe-deficiency stress prompted further testing of other graminaceous (grass) species for phytosiderophore release and results have prompted characterization of these plants into a Strategy II designation. This classification denotes an enhanced release of phytosiderophore in response to Fe-deficiency stress with a concomitant uptake of Fe by the plant. The objective of this study was to determine if Fe-inefficient and Fe-efficient corn (Zea mays L.) differ in their release of ‘Fe solubilizing substances’ in response to Fe-deficiency stress. We have not identified the specific structure of these substances but refer to them as ‘phytosiderophores’ to further characterize their behavior. By our indirect method, there was no measurable release of Fe solubilizing substances (phytosiderophores) from either the Fe-efficient WF9 or the Fe-inefficient ys1 corn despite WF9 being greener and apparently more Fe efficient than ys1. Fe-efficient Coker 227 oats (Avena byzantina C. Koch.) has been found to release a phytosiderophore whereas the Fe-inefficient TAM 0-312 does not. Iron-stressed Coker 227 oats released Fe solubilizing substances when grown in the same solution with WF9 corn which resulted in greening and Fe uptake by WF9 corn. Iron efficiency in these two graminaceous species appears to be controlled by different mechanisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00011870
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  • 6
    Electronic Resource
    Electronic Resource
    Iron-efficient and iron-inefficient oats and corn respond differently to iron-deficiency stress (1991)
    Springer
    Plant and soil 130 (1991), S. 165-172 
    Details
    ISSN: 1573-5036
    Keywords: Avena byzantina C. Koch. ; BPDS ; corn ; EDDHA ; grasses ; iron-efficient ; iron-inefficient ; oats ; reduction ; Zea mays L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Iron-efficient (WF9 corn and Coker 227 oat) and Fe-inefficient (ys1 corn and TAM 0–312 oat) cultivars were comparatively tested for their response to Fe-deficiency stress induced by the use of either ferrous or ferric chelators. Corn and oats were grown in 20 μM Fe with 0, 60, and 120 μM BPDS and 40 μM Fe with 0, 120, and 240 μM BPDS and 20 μM Fe with 0 and 40 μM EDDHA. All four cultivars tested, both Fe-efficient and Fe-inefficient, continuously reduced Fe3+ to Fe2+ at a low level as evidenced by the production of Fe2+ (BPDS)3 in test nutrient solutions over time. Severity of chlorosis increased as more BPDS was added to the nutrient solutions for both WF9 and ys1 corn, but unlike corn, Coker 227 and TAM 0-312 oats were both able to obtain Fe from the Fe2+ (BPDS)3 complex and were less chlorotic as a result. In short-term (4-hour) in vivo measurements, iron-stressed WF9 (Fe-efficient) corn reduced more Fe3+ to Fe2+ than similarly stressed ys1 corn, Coker 227 oat or TAM 0-312 oat. Thus, at the same time that Fe-efficient WF9 corn reduces more Fe than the other cultivars, it is also unable to compete with BPDS for that Fe in the nutrient solution. These differences coupled with the observation that only Coker 227 oat produced measureable iron solubilizing substances (phytosiderophores) suggest that these two species differ in their mechanisms for obtaining Fe during Fe-deficiency stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00011871
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  • 7
    Electronic Resource
    Electronic Resource
    Selenium Occurrence, Distribution and Speciation in the Cockle Anadara trapezia and the Mullet Mugil cephalus (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 11 (1997), S. 313-326 
    Details
    ISSN: 0268-2605
    Keywords: selenium ; biogeochemical cycle ; Anadara trapezia ; Mugil cephalus ; selenocysteine ; Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Data on the factors affecting the accumulation of selenium in the cockle Anadara trapezia and mullet Mugil cephalus are presented, together with the distribution and speciation of selenium in tissues. Selenium concentration in whole cockles showed a small but significant decrease with weight. No further decrease in selenium concentration was apparent once an organism reached 0.25 g dry weight. Selenium concentration in cockles was not dependent on sex. The tissue distribution of selenium concentration in cockles was in the order gill〉intestine〉adductor〉mantle 〉foot.Selenium concentrations in liver tissues of mullet increased with the whole weight of the fish. In contrast, selenium concentrations in muscle, stomach, heart and kidney tissues were fairly low and constant in fish weighing less than 200 g (20 cm in length). Fish of greater weight and size (〉250 g and 〉30 cm) had higher and more variable selenium concentrations. No differences in selenium concentration between male and female fish occurred; however, the sex of many of the fish could not be distinguished. The tissue distribution of selenium concentration in mullet was in the order liver〉stomach〉heart〉muscle〉kidney.Most of the selenium recovered from both the cockle tissues and the mullet muscle tissues was found to be associated with proteins and to be present as selenocysteine. A conceptual model is presented for selenium transformations in marine organisms based on the formation of selenoamino-acids and subsequent incorporation into proteins. © 1997 by John Wiley & Sons, Ltd.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 8
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    About this title - The North Atlantic Igneous Province: Stratigraphy, Tectonic, Volcanic and Magmatic Processes / edited by D. W. Jolley and B. R. Bell (2002)
    In:  Geological Society Special Publication 197: NP.
    Details
    Publication Date: 2002-01-01
    Description: The North Atlantic Igneous Province has been the subject of extensive scientific investigation over the past thirty years, with a wide field of knowledge being accumulated. Recently, recognition of the potential role of Large Igneous Provinces in affecting ocean and atmosphere systems and biotic evolutionary pathways has lead to increased interest in this province. This has been further stimulated by the expansion in the search for oil and gas in Mesozoic and Tertiary sediments along the NE Atlantic Margin. An improved understanding of the interaction between igneous and sedimentary processes is vital for the identification of potential hydrocarbon resources. The regions covered include continental margin Norway, east and west Greenland, the Faroe-Shetland Basin and the Faroe Islands themselves. The papers in this book contain new data and interpretations of North Atlantic Igneous Province magmatic processes, rift evolution, tectonics, stratigraphy (chemostratigraphy, biostratigraphy, seismic and isotope stratigraphy) and sediment dispersal. Many of the papers adopt a multidisciplinary approach to tha analysis and interpretation of complex volcanic and sedimentary sequences. These new data, and the reviews and compilations of existing data provide the reader with access to current research directions in North Atlantic Igneous Province geology.
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  • 9
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    Palynostratigraphy and palaeoenvironmental shifts in Oligocene and Miocene strata from offshore Angola, west-central Africa (2014)
    American Association of Stratigraphic Palynologists (AASP)
    Details
    Publication Date: 2014-11-05
    Description: A palynological investigation of 15 ditch cutting samples from Borehole 8, located off the Angolan coast, west-central Africa, revealed Late Oligocene (Chattian) to latest Middle to earliest Early Miocene (Serravallian/earliest Tortonian?) marine dinoflagellate cysts, freshwater colonial algae and terrestrial palynomorphs. Various early Miocene pollen characterising the Verrutricolporites rotundiporus Zone of Legoux (1978) confirm the location of the Oligocene–Miocene boundary in relation to a new short-ranging early Miocene dinoflagellate cyst taxon Cristadinium headii sp. nov. The Oligocene to Miocene dinoflagellate cyst assemblages reflect three periods, A–C, with high palaeoproductivity, corresponding to periods in the latest Oligocene (late Chattian), Early Miocene (late Aquitanian–early Burdigalian?) and the base of the Middle Miocene (Langhian). Early to middle Miocene acme intervals of Cleistosphaeridium placacanthum and Cribroperidinium tenuitabulatum are considered to reflect two regional oceanographic events due to intense upwelling along the West African coast. A distinct Early Miocene episode of brackish-water outflow from the nearby Angolan mainland is also reflected by the palynological assemblages, perhaps linked to the global Mi-1 event. Changes in relative abundance of grass pollen indicate a gradual change towards a drier and perhaps also warmer Burdigalian–Langhian climate during which the Angolan savanna developed, followed by cooler and perhaps more humid conditions following the Miocene Climatic Optimum.
    Print ISSN: 0191-6122
    Electronic ISSN: 1558-9188
    Topics: Geosciences
    Published by American Association of Stratigraphic Palynologists (AASP)
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  • 10
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    Long-term resilience decline in plant ecosystems across the Danian Dan-C2 hyperthermal event, Boltysh crater, Ukraine (2015)
    Geological Society of London
    Details
    Publication Date: 2015-06-24
    Description: Mass-balance calculations indicate that a massive amount of 13 C-depleted carbon was released into the early Danian atmosphere in volumes comparable with the younger Paleocene–Eocene Thermal Maximum (PETM). This Danian hyperthermal event (the Dan-C2) has been documented from the fill of the Boltysh meteorite crater, Ukraine. Palynofloras recovered from the Boltysh crater fill show a trend from mesic forest to savannah ecosystem dominance on a millennial scale across the hyperthermal inception with no abrupt compositional shift. This longer-term trend is overprinted by moisture availability oscillations reflecting orbital forcing. Forcing is not directly tracked by the oscillations, which are composed of mesic forest and savannah palynofloras separated by rapid critical transitions. The absence of an ecological collapse at the Dan-C2 indicates that plant ecosystems experienced dominant forcing from orbital cyclicity, rather than a stochastic temperature rise.
    Print ISSN: 0016-7649
    Topics: Geosciences
    Published by Geological Society of London
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