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  • Elsevier  (673,626)
  • American Institute of Physics  (112,069)
  • PANGAEA  (51,334)
  • Nature Publishing Group
  • 2020-2023  (296)
  • 2010-2014  (730,045)
  • 1965-1969  (133,468)
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  • 1
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    Bulk sediment characteristics and geomicrobiology of sediment core 5022-1J from Laguna Potrok Aike, southern Patagonia. (2013)
    PANGAEA
    Details
    Publication Date: 2022-11-29
    Description: Living microorganisms inhabit every environment of the biosphere but only in the last decades their importance governing biochemical cycles in deep sediments has been widely recognized. Most investigations have been accomplished in the marine realm whereas there is a clear paucity of comparable studies in lacustrine sediments. One of the main challenges is to define geomicrobiological proxies that can be used to identify different microbial signals in the sediments. Laguna Potrok Aike, a maar lake located in Southeastern Patagonia, has an annually not stratifying cold water column with temperatures ranging between 4 and 10 °C, and most probably an anoxic water/sediment interface. These unusual features make it a peculiar and interesting site for geomicrobiological studies. Living microbial activity within the sediments was inspected by the first time in a sedimentary core retrieved during an ICDP-sponsored drilling operation. The main goals to study this cold subsaline environment were to characterize the living microbial consortium; to detect early diagenetic signals triggered by active microbes; and to investigate plausible links between climate and microbial populations. Results from a meter long gravity core suggest that microbial activity in lacustrine sediments can be sustained deeper than previously thought due to their adaptation to both changing temperature and oxygen availability. A multi-proxy study of the same core allowed defining past water column conditions and further microbial reworking of the organic fraction within the sediments. Methane content shows a gradual increase with depth as a result of the fermentation of methylated substrates, first methanogenic pathway to take place in the shallow subsurface of freshwater and subsaline environments. Statistical analyses of DGGE microbial diversity profiles indicate four clusters for Bacteria reflecting layered communities linked to the oxidant type whereas three clusters characterize Archaea communities that can be linked to both denitrifiers and methanogens. Independent sedimentary and biological proxies suggest that organic matter production and/or preservation have been lower during the Medieval Climate Anomaly (MCA) coinciding with a low microbial colonization of the sediments. Conversely, a reversed trend with higher organic matter content and substantial microbial activity characterizes the sediments deposited during the Little Ice Age (LIA). Thus, the initial sediments deposited during distinctive time intervals under contrasting environmental conditions have to be taken into account to understand their impact on the development of microbial communities throughout the sediments and their further imprint on early diagenetic signals.
    Type: info:eu-repo/semantics/workingPaper
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  • 2
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    Geomicrobiology, bulk sediment characteristics and pore water chemistry of sediment cores from Laguna Potrok Aike, southern Patagonia. (2013)
    PANGAEA
    Details
    Publication Date: 2022-11-29
    Description: Authigenic minerals can form in the water column and sediments of lakes, either abiotically or mediated by biological activity. Such minerals have been used as paleosalinity and paleoproductivity indicators and reflect trophic state and early diagenetic conditions. They are also considered potential indicators of past and perhaps ongoing microbial activity within sediments. Authigenic concretions, including vivianite, were described in late glacial sediments of Laguna Potrok Aike, a maar lake in southernmost Argentina. Occurrence of iron phosphate implies specific phosphorus sorption behavior and a reducing environment, with methane present. Because organic matter content in these sediments was generally low during glacial times, there must have been alternative sources of phosphorus and biogenic methane. Identifying these sources can help define past trophic state of the lake and diagenetic processes in the sediments. We used scanning electron microscopy, phosphorus speciation in bulk sediment, pore water analyses, in situ ATP measurements, microbial cell counts, and measurements of methane content and its carbon isotope composition (d13C CH4) to identify components of and processes in the sediment. The multiple approaches indicated that volcanic materials in the catchment are important suppliers of iron, sulfur and phosphorus. These elements influence primary productivity and play a role in microbial metabolism during early diagenesis. Authigenic processes led to the formation of pyrite framboids and revealed sulfate reduction. Anaerobic oxidation of methane and shifts in pore water ion concentration indicated microbial influence with depth. This study documents the presence of active microbes within the sediments and their relationship to changing environmental conditions. It also illustrates the substantial role played by microbes in the formation of Laguna Potrok Aike concretions. Thus, authigenic minerals can be used as biosignatures in these late Pleistocene maar sediments.
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  • 3
    Electronic Resource
    Electronic Resource
    Motion of Phobos (1969)
    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 789-789 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Two pairs of observations made at the Pulkovo Observatory in 1956 and 1967 have recently been made available in a personal communication by Professor G. A. Chebotarev. Again I have found that the same orbital elements fit these observations with residuals of only + 2 in mean longitude. On the other ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/224789a0
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  • 4
    Electronic Resource
    Electronic Resource
    Middle East Rift Zones (1969)
    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 791-791 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We originally stated that we consider that the motions of the three plates may be described as approximating to rotation about the Libyan pole of Le Pichon and Hertzler3. One of the reasons for the approximation is that there is some evidence that the plates suffer internal deformation for, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/224791a0
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  • 5
    Electronic Resource
    Electronic Resource
    Dredged Basalt from the Reykjanes Ridge, North Atlantic (1969)
    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 791-793 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We easily correlated the magnetic anomalies with the pre-existing magnetic survey3, copies of which came from M. Talwani. The field varies somewhat laterally3, but not nearly as much as the topography does. The topography of the ridge can be divided into (1) outer flanks with low undulating ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/224791b0
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  • 6
    Electronic Resource
    Electronic Resource
    Heart Attacks: Role of Catecholamines (1969)
    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 946-947 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Is there a connexion between concentrations of cate-cholamines and fatty acids in the blood and the occurrence of heart attacks ? Evidence has been conflicting, but some recent results suggest that these substances are important. Last year Oliver, Kurien and Greenwood found a significant ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/224946b0
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  • 7
    Electronic Resource
    Electronic Resource
    Erratum (1969)
    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 395-395 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the article "Bremsstrahlung Radiation in. Intense Magnetic Fields" by Simon and Strange (Nature, 224, 49 ; 1969), equation (2) should read : ±=83c 2cosn() nr2Qw df dpz dpz and five lines below read "Assuming that Qw(pz = ± ) f(± ) = ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/224395a0
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  • 8
    Electronic Resource
    Electronic Resource
    Corrigendum (1969)
    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 395-395 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the article "Petrological, Magnetic and Chemical Properties of Basalt dredged from an Abyssal Hill in the North-east Pacific" by B. P. Luyendyk and C. G. Engel (Nature, 223, 1049; 1969), several lines were omitted from the text. The first few sentences of the second paragraph on page 1050 should ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/224395c0
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  • 9
    Electronic Resource
    Electronic Resource
    British Diary (1969)
    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 396-396 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Monday, October 27 A Basis for a Mathematical Theory of Direction-Defining Radio Beacons (5.30 p.m.) Mr C. W. Earp, Institution of Electrical Engineers, at Savoy Place, London WC2. Scientific Aspects of Margarine (10 a.m.) Society of Chemical Industry; Royal Society of Health; and IFST, at the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/224396a0
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  • 10
    Electronic Resource
    Electronic Resource
    Bleak Future for Humpty-Dumpty (1969)
    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 201-202 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE strange affairs of the British nuclear power industry continue to raise in the minds of honest people the simple question whether the British Government knows what it is trying to accomplish in this important field. A long time has gone since the Ministry of Technology first described, in July ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/224201a0
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