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  • 1
    Electronic Resource
    Electronic Resource
    Quartz latite rheoignimbrite flows of the Etendeka Formation, north-western Namibia (1992)
    Springer
    Bulletin of volcanology 54 (1992), S. 200-219 
    Details
    ISSN: 1432-0819
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The Etendeka Formation of north-western Namibia consists of a sequence of interbedded quartz latites and tholeiitic basalts and forms part of the Karoo Igneous Province in southern Africa. The age of the Etendeka Formation is approximately 130–135 Ma. The quartz latites make up a significant proportion of the stratigraphic succession (〈25% of the total stratigraphic thickness) and form as much as 60% of the outcrop area in the southern Etendeka. Apart from some systematic differences between pitchstones and devitrified quartz latite, largely explained by alteration processes, individual quartz latite units exhibit remarkably uniform compositions with no significant vertical or lateral variation. Geochemistry can be used as a primary criterion for the correlation of major quartz latite units over much of the southern Etendeka area enabling the reconstruction of the Etendeka Formation stratigraphy in this region. Individual quartz latite units occur as voluminous (400–2600 km3), widespread (up to 8800 km2), sheet-like deposits typically between 40 and 300 m thick. Each unit consists of basal, main and upper zones. The main zone generally constitutes over 70% of the thickness of the unit and typically consists of texturally featureless devitrified quartz latite. In contrast the basal and upper zones of the flow are characterised by flow banding, pitchstone lenses and breccia, with rare occurrences of pyroclastic textures. The quartz latites are sparsely porphyritic (〈10% phenocrysts) with glassy or devitrified groundmass textures. The phenocrysts consist of plagioclase, pyroxene, titanomagnetite and rare ilmenite. Pyroxene geothermometry indicates high (1000–1100°C) temperatures of crystallisation which, coupled with the absence or primary hydrous phases, indicates that the quartz latites were relatively hot, H2O-undersaturated magmas. The quartz latites display features common to both rhyolite lavas and ignimbrites and are clearly the products of an unusual eruption style. The local preservation of pyroclastic textures and the broad areal extent of these units lead to the conclusion that the quartz latites are high-temperature rheomorphic ignimbrites (i.e. rheoignimbrites). A combination of high eruption temperature and relatively low viscosity helps to explain the often completely welded and homogeneous textures observed in most quartz latite outcrops in the Etendeka area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00278389
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of broadcast P applications and small amounts of fertilizer placed with the seed on continuously cropped corn (Zea mays L.) (1985)
    Springer
    Nutrient cycling in agroecosystems 6 (1985), S. 269-277 
    Details
    ISSN: 1573-0867
    Keywords: broadcast P ; corn ; fertilizer with the seed ; maize ; pop-up fertilizer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The response of corn (Zea mays L.) to broadcast P applications and to small amounts of fertilizer placed with the seed (fws) was measured in three field trials conducted for 10 years. Five rates of P (0, 11, 22, 45, and 90 kg ha−1 yr−1) were applied with and without 4.0-6.4-3.2 kg N, P, K ha−1 placed with the seed (fws) in a factorial arrangement of treatments. The fws treatment delayed emergence at all sites, reduced final emergence at two of the three sites, increased seedling dry weights at the 4 to 6 leaf stage and reduced the time to 50% silking at two of the three sites. Ear moisture content at harvest was reduced by fws at all sites which indicated that fws advanced maturity. The fws treatment increased grain yield at two of the sites by 1.3 and 2.3%, respectively. Broadcast P applications increased seedling dry weight at all sites but decreased the time to 50% silking only at one site. Broadcast P decreased ear moisture content and increased grain yield at two sites. There was a significant fws by broadcast P interaction in the most P deficient soil such that response to broadcast P was lessened by fws. The interaction was strongest during the early stages of growth and decreased with maturity resulting in no fws by broadcast P interaction for grain yield.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01048800
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  • 3
    Electronic Resource
    Electronic Resource
    Lake Søbygaard: a shallow lake in recovery after a reduction in phosphorus loading (1987)
    Springer
    GeoJournal 14 (1987), S. 381-384 
    Details
    ISSN: 1572-9893
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography
    Notes: Abstract The development and recovery of a shallow and hypertrophic lake following a reduction in the external phosphorus load has been documented. In spite of this reduction, phosphorus concentrations and phytoplankton biomass in the lake water are still very high. The reason for this development can be explained by three main factors: (1): the sediment has been accumulating a large phosphorus pool which is now causing a high internal phosphorus load, (2) due to the shallow conditions, resuspension of the upper sediment often takes place because of wind action and thereby increases the phosphorus loading from the sediment, (3) the development of a large population of planktivorous fish decreases the zooplankton biomass resulting in the development of a large phytoplankton biomass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00208216
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  • 4
    Electronic Resource
    Electronic Resource
    Genbank accession #: AF 135190 (1999)
    Springer
    Plant molecular biology 40 (1999), S. 751-751 
    Details
    ISSN: 1573-5028
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006222722541
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  • 5
    Electronic Resource
    Electronic Resource
    Genbank accession #: AF 124983 (1999)
    Springer
    Plant molecular biology 40 (1999), S. 753-753 
    Details
    ISSN: 1573-5028
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006274706611
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  • 6
    Electronic Resource
    Electronic Resource
    Ein Bericht über die entomologische Forschung in Thailand (1971)
    Springer
    Journal of pest science 44 (1971), S. 152-155 
    Details
    ISSN: 1612-4766
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary This paper is briefly recorded about the research of Entomology in Thailand as far as the literature concerned.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02200300
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  • 7
    Electronic Resource
    Electronic Resource
    Fette (1920)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 59 (1920), S. 27-30 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01361771
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  • 8
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    Ein Bericht über die entomologische Forschung in Thailand (1971)
    Springer
    Details
    Publication Date: 1971-10-01
    Print ISSN: 1612-4758
    Electronic ISSN: 1612-4766
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Springer
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  • 9
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    A new cryptostome bryozoan Ptilotrypa from the Upper Ordovician Yong Limestone Formation: Tethyan sequence of Kumaun Higher Himalaya, India (2019)
    Paleontological Society
    Details
    Publication Date: 2019
    Description: 〈span〉〈div〉Abstract〈/div〉A new species of the Paleozoic bryozoan genus 〈span〉Ptilotrypa〈/span〉 of the order Cryptostomata is described from the lower part of the Yong Limestone Formation, Katian, Upper Ordovician of the Kumaun Tethys Himalaya: 〈span〉Ptilotrypa bajpaii〈/span〉 new species. The presence of the genus 〈span〉Ptilotrypa〈/span〉 in the Tethyan Himalaya suggests paleogeographic connections to the Upper Ordovician of North America and, consequently, Upper Ordovician age for the lower part of the Yong Limestone Formation. This species displays a reticulate colony shape, which suggests an efficient filtering capacity in an environment with a high primary production. Morphological peculiarities and systematic assignment of the genus 〈span〉Ptilotrypa〈/span〉 are discussed.UUID: http://zoobank.org/898276c8-2924-4da2-ae96-3392cb2ebbc3〈/span〉
    Print ISSN: 0022-3360
    Electronic ISSN: 1937-2337
    Topics: Geosciences
    Published by Paleontological Society
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  • 10
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    Estimating the number of pulses in a mass extinction (2018)
    Paleontological Society
    Details
    Publication Date: 2018
    Description: 〈span〉〈div〉Abstract〈/div〉The Signor-Lipps effect states that even a sudden mass extinction will invariably appear gradual in the fossil record, due to incomplete fossil preservation. Most previous work on the Signor–Lipps effect has focused on testing whether taxa in a mass extinction went extinct simultaneously or gradually. However, many authors have proposed scenarios in which taxa went extinct in distinct pulses. Little methodology has been developed for quantifying characteristics of such pulsed extinction events. Here we introduce a method for estimating the number of pulses in a mass extinction, based on the positions of fossil occurrences in a stratigraphic section. Rather than using a hypothesis test and assuming simultaneous extinction as the default, we reframe the question by asking what number of pulses best explains the observed fossil record.Using a two-step algorithm, we are able to estimate not just the number of extinction pulses but also a confidence level or posterior probability for each possible number of pulses. In the first step, we find the maximum likelihood estimate for each possible number of pulses. In the second step, we calculate the Akaike information criterion and Bayesian information criterion weights for each possible number of pulses, and then apply a 〈span〉k〈/span〉-nearest neighbor classifier to these weights. This method gives us a vector of confidence levels for the number of extinction pulses—for instance, we might be 80% confident that there was a single extinction pulse, 15% confident that there were two pulses, and 5% confident that there were three pulses. Equivalently, we can state that we are 95% confident that the number of extinction pulses is one or two. Using simulation studies, we show that the method performs well in a variety of situations, although it has difficulty in the case of decreasing fossil recovery potential, and it is most effective for small numbers of pulses unless the sample size is large. We demonstrate the method using a data set of Late Cretaceous ammonites.〈/span〉
    Print ISSN: 0094-8373
    Electronic ISSN: 1938-5331
    Topics: Geosciences
    Published by Paleontological Society
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