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  • 1
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    Integrated geological and geophysical studies in the SG4 borehole area, Tagil Volcanic Arc, Middle Urals: Location of seismic reflectors and source of the reflectivity (2000)
    In:  J. Geophys. Res., Hannover, Bundesanstalt für Geowissenschaften und Rohstoffe, vol. 105, no. B9, pp. 21,333-21,352, pp. TC3002
    Details
    Publication Date: 2000
    Keywords: Borehole geophys. ; EUROPROBE (Geol. and Geophys. in eastern Europe) ; Uralskaya ; Reflection seismics ; Vertical seismic profiling ; CDP ; crossed ; profiles ; Moving source Vertical seismic profiling ; 0915 ; Exploration ; geophysics ; Downhole ; methods ; 0935 ; Seismic ; methods ; (3025) ; 3210 ; Mathematical ; geophysics ; (new ; field) ; Modeling ; 8015 ; Structural ; geology ; (8165) ; Local ; crustal ; structure ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Basement‐cover relationships and their along‐strike changes in the Linking Zone (Iberian Range, Spain): a combined structural and gravimetric study (2019)
    Wiley
    In: Tectonics
    Details
    Publication Date: 2019
    Description: Abstract Contractional deformation in the transition between the Iberian and Catalan Coastal Ranges (Linking Zone) generated both thin‐skinned structures detached in low‐strength Triassic units, and basement‐involved structures. To evaluate their extent and relative contribution to the overall structure, we carried out a study combining structural geology and gravimetry. New gravity data (938 stations) and density determinations (827 samples) were acquired and combined with previous existing databases to obtain Bouguer anomaly and residual Bouguer anomaly maps of the study area. Seven serial and balanced cross sections were constructed, their depth geometries being constrained through the 2.5D gravity modelling and the 3D gravity inversion that we accomplished. The residual Bouguer anomaly map shows a good correlation between basement antiforms and gravity highs whereas negative anomalies mostly correspond to (i) Meso‐Cenozoic synclines and (ii) Neogene‐Quaternary basins. Cross sections depict a southern, thick‐skinned domain where extensional, basement faults inherited from Late Jurassic‐Early Cretaceous times were inverted during the Cenozoic. To the North, we interpret the existence of both Triassic‐detached and basement‐involved deformation domains. The two deformation styles are vertically overlapped in the southernmost part of the Catalan Coastal Ranges but relay both across and along strike in the Eastern Iberian Range. These basement and cover relationships and their along‐strike variations are analyzed in terms of the interplay between structural inheritance, its obliquity to the shortening direction and the continuity and effectiveness of Triassic décollements in the study area.
    Print ISSN: 0278-7407
    Electronic ISSN: 1944-9194
    Topics: Geosciences
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 3
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    Multiple independent introductions of Plasmodium falciparum in South America [Evolution] (2012)
    National Academy of Sciences
    Details
    Publication Date: 2012-01-12
    Description: The origin of Plasmodium falciparum in South America is controversial. Some studies suggest a recent introduction during the European colonizations and the transatlantic slave trade. Other evidence—archeological and genetic—suggests a much older origin. We collected and analyzed P. falciparum isolates from different regions of the world, encompassing the distribution range of the parasite, including populations from sub-Saharan Africa, the Middle East, Southeast Asia, and South America. Analyses of microsatellite and SNP polymorphisms show that the populations of P. falciparum in South America are subdivided in two main genetic clusters (northern and southern). Phylogenetic analyses, as well as Approximate Bayesian Computation methods suggest independent introductions of the two clusters from African sources. Our estimates of divergence time between the South American populations and their likely sources favor a likely introduction from Africa during the transatlantic slave trade.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 4
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    First-order unification in the PVS proof assistant (2014)
    Oxford University Press
    Details
    Publication Date: 2014-09-19
    Description: This work presents formalizations of properties and algorithms for the first-order unification theory in the proof assistant PVS. In previous works a formalization of the theorem of existence of most general unifiers ( mgu's ) for first-order unifiable problems was presented and then, it was illustrated how the formalizations of correctness and completeness used for the proof of the theorem of existence, can be adapted in order to verify greedy unification algorithms à la Robinson. The distinguishing feature of these two formalizations is that they remain close to the textbook proofs which was possible through the use of the higher-order specification language and proof engine of PVS. That work consists of two elaborated PVS theories having been the one related with the theorem of existence of mgu's applied for obtaining a full formalization of the Knuth-Bendix(-Huet) critical pair theorem. In addition to these two developments, this work describes a formalization of the correction and completeness of a more elaborated first-order unification algorithm. In contrast with the greedy algorithm, the current one is more efficient. It navigates in a post-order traversal the tree structure of the two terms being unified in such a way that after the difference at the first position of conflict (found in inner-most, left-most order) between the terms is eliminated through a linkage substitution (mapping a variable into a term), the search of the following position of conflict is computed through application of auxiliary functions starting from the previous position. Unlike this more efficient traversal, the greedy unification algorithm always restarts the search of conflicts from the root of the terms being unified. The new formalization gave rise to a more elaborated PVS development in which unlike a relatively straightforward application of correctness and completeness formalizations of the theorem of existence of mgu's , it was necessary the formalization of a series of structural auxiliary lemmas to deal with formalization of properties of the tree data structure used to represent terms.
    Print ISSN: 1367-0751
    Electronic ISSN: 1368-9894
    Topics: Mathematics
    Published by Oxford University Press
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  • 5
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    Three‐dimensional geophysical characterization of the La Rambla and Zafra de Záncara anticlines (Loranca Basin, Central Spain) (2019)
    Wiley
    Details
    Publication Date: 2019
    Description: ABSTRACT The Zafra de Záncara anticline (also known as the El Hito anticline), located in the Loranca Cenozoic Basin (part of the Tagus Basin, Central Spain), had been studied by several oil companies during the late 1960s and early 1970s. In 2009, within the ‘Plan for selection and characterization of suitable structures of CO2 geological storage’, this anticline was selected as a potential CO2 storage site. A preliminary three‐dimensional geological model, based on five geological cross sections that were constrained with the interpretation of the available seismic profiles (that are rather old and do not have very good quality), was created. With the aim of improving the geological knowledge of the Zafra de Záncara anticline and helping to investigate the suitability of a nearby anticline, namely La Rambla, as another structural closure that might make it a possible CO2 storage site, a local gravity survey (1 station every km2) was carried out in the area, seven new geological cross sections, based on these existing seismic profiles and field geology, were build, and a new three‐dimensional geological model that included both anticlines, improved through three‐dimensional stochastic gravity inversion, was constructed. The densities needed for the geological formations of the model come from the analysis of rock samples, logging data from El Hito‐1 drillhole and petrophysical information from Instituto Geológico y Minero de España database. The inversion has improved the knowledge about the geometry of the anticlines’ traps and seals as well as the geometry of the basement relief and the structural relationship between basement and cover.
    Print ISSN: 0016-8025
    Electronic ISSN: 1365-2478
    Topics: Geosciences , Physics
    Published by Wiley
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  • 6
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    Middle Miocene closure of the Central American Seaway (2015)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2015-04-11
    Description: Uranium-lead geochronology in detrital zircons and provenance analyses in eight boreholes and two surface stratigraphic sections in the northern Andes provide insight into the time of closure of the Central American Seaway. The timing of this closure has been correlated with Plio-Pleistocene global oceanographic, atmospheric, and biotic events. We found that a uniquely Panamanian Eocene detrital zircon fingerprint is pronounced in middle Miocene fluvial and shallow marine strata cropping out in the northern Andes but is absent in underlying lower Miocene and Oligocene strata. We contend that this fingerprint demonstrates a fluvial connection, and therefore the absence of an intervening seaway, between the Panama arc and South America in middle Miocene times; the Central American Seaway had vanished by that time.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Montes, C -- Cardona, A -- Jaramillo, C -- Pardo, A -- Silva, J C -- Valencia, V -- Ayala, C -- Perez-Angel, L C -- Rodriguez-Parra, L A -- Ramirez, V -- Nino, H -- New York, N.Y. -- Science. 2015 Apr 10;348(6231):226-9. doi: 10.1126/science.aaa2815.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Universidad de los Andes, Bogota, Colombia. cmontes@uniandes.edu.co. ; Universidad Nacional de Colombia, Medellin, Colombia. ; Smithsonian Tropical Research Institute, Ciudad de Panama, Panama. ; Universidad de Caldas, Manizales, Colombia. ; University of Houston, Houston, TX 77004, USA. ; Washington State University, Pullman, WA 99164, USA. ; Corporacion Geologica Ares, Bogota, Colombia. ; Universidad de los Andes, Bogota, Colombia. ; Ecopetrol, Bogota, Colombia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25859042" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    Carryover effects of larval exposure to different environmental bacteria drive adult trait variation in a mosquito vector (2017)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2017-08-17
    Description: Conditions experienced during larval development of holometabolous insects can affect adult traits, but whether differences in the bacterial communities of larval development sites contribute to variation in the ability of insect vectors to transmit human pathogens is unknown. We addressed this question in the mosquito Aedes aegypti , a major arbovirus vector breeding in both sylvatic and domestic habitats in Sub-Saharan Africa. Targeted metagenomics revealed differing bacterial communities in the water of natural breeding sites in Gabon. Experimental exposure to different native bacterial isolates during larval development resulted in significant differences in pupation rate and adult body size but not life span. Larval exposure to an Enterobacteriaceae isolate resulted in decreased antibacterial activity in adult hemolymph and reduced dengue virus dissemination titer. Together, these data provide the proof of concept that larval exposure to different bacteria can drive variation in adult traits underlying vectorial capacity. Our study establishes a functional link between larval ecology, environmental microbes, and adult phenotypic variation in a holometabolous insect vector.
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
    Published by American Association for the Advancement of Science (AAAS)
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  • 8
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    Reconstruction of the exhumed mantle across the North-Iberian Margin by crustal-scale 3D gravity inversion and geological cross-section (2017)
    Wiley
    In: Tectonics
    Details
    Publication Date: 2017-11-24
    Description: Recent models support the view that the Pyrenees were formed after the inversion of a previously highly extended continental crust which included exhumed upper mantle rocks. Mantle rocks remain near to the surface after compression and mountain building, covered by the latest Cretaceous to Paleogene sequences. 3D lithospheric-scale gravity inversion demands the presence of a high-density mantle body placed within the crust in order to justify the observed anomalies. Exhumed mantle, having ~50 kilometers of maximum width, continuously extends beneath the Basque-Cantabrian Basin and along the northern side of the Pyrenees. The association of this body with rift, post-rift and inversion structural geometries are tested in a balanced cross-section across the Basque-Cantabrian Basin that incorporates a major south-dipping ramp-flat-ramp extensional detachment active between Valanginian and early Cenomanian times. Results indicate that horizontal extension progressed circa 48 km at variable strain rates which increased from 1 to ~4 mm/yr in middle Albian times. Low-strength Triassic Keuper evaporites and mudstones above the basement favor the decoupling of the cover with formation of minibasins, expulsion roll-overs and diapirs. The inversion of the extensional system is accommodated by doubly-verging basement thrusts due to the reactivation of the former basin bounding faults in Eocene-Oligocene times. Total shortening is estimated in ~34 km and produced the partial subduction of the continental lithosphere beneath the two sides of the exhumed mantle. Obtained results help to pinpoint the original architecture of the North-Iberian Margin and the evolution of the hyperextended aborted intracontinental basins.
    Print ISSN: 0278-7407
    Electronic ISSN: 1944-9194
    Topics: Geosciences
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 9
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    Clonal reproduction: Alternatives to sex [Introductions] (2015)
    National Academy of Sciences
    Details
    Publication Date: 2015-07-22
    Description: Evolutionary studies of clonal organisms have advanced considerably in recent years, but are still fledgling. Although recent textbooks on evolution or genetics might give the impression that nonsexual reproduction is an anomaly in the living world, clonality is the rule rather than the exception in many viruses, bacteria, and parasites...
    Keywords: In the Light of Evolution IX: Clonal Reproduction: Alternatives to Sex Sackler Colloquium
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 10
    Electronic Resource
    Electronic Resource
    Toxicosis and Residues in Bromophos-Dipped Sheep (1966)
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 14 (1966), S. 608-609 
    Details
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jf60148a016
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    Paper (German National Licenses)
    Fulltext
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