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  • 1
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    Capturing Key Attributes of Fine-Grained Sedimentary Rocks In Outcrops, Cores, and Thin Sections: Nomenclature and Description Guidelines (2015)
    Society for Sedimentary Geology (SEPM)
    Details
    Publikationsdatum: 2015-03-14
    Beschreibung: A bstract :  An integrated nomenclature scheme is proposed to capture the inherent heterogeneity of fine-grained sedimentary rocks at the 10 2 to 10 –3  mm scale and to assist the evaluation of these rocks as sinks of organic carbon, barriers to fluid flows, and reservoirs of oil and gas. This scheme incorporates previous knowledge and the latest field, petrographic, and laboratory observations. We propose to name fine-grained sedimentary rocks using a root term based on their texture (grain size), which is modified by description of bedding, composition, and grain origin. Regarding texture, we suggest the use of "mudstone" as a class name for the entire spectrum of fine-grained sedimentary rocks. We define mudstone as a rock in which more than fifty percent of its grains are mud (clay and silt) size (〈 62.5 µm). Similar to the approach used for the description of sandstone texture, mudstone texture can be refined by a "coarse," "medium," or "fine" size-range term. Regarding bedding, we follow Campbell's (1967) genetic approach to define laminae, laminasets, and beds, and describe lamina geometry, continuity, and shape. Regarding composition, we propose terms such as "siliceous," "calcareous," "argillaceous," and "carbonaceous" to capture differences in rock composition. The name of a mudstone can be further modified by additional attributes that detail the form and origin of the rock components. Application of this approach to the Cretaceous Eagle Ford Shale illustrates the variability typically present in mudstone successions and demonstrates how our detailed characterization can be used to decipher and predict rock properties of economic interest.
    Print ISSN: 1527-1404
    Thema: Geologie und Paläontologie
    Publiziert von Society for Sedimentary Geology (SEPM)
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    Late Proterozoic and Paleozoic Tides, Retreat of the Moon, and Rotation of the Earth (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1996-07-05
    Beschreibung: The tidal rhythmites in the Proterozoic Big Cottonwood Formation (Utah, United States), the Neoproterozoic Elatina Formation of the Flinders Range (southern Australia), and the Lower Pennsylvanian Pottsville Formation (Alabama, United States) and Mansfield Formation (Indiana, United States) indicate that the rate of retreat of the lunar orbit is dxi/dt approximately k2 sin(2delta) (where xi is the Earth-moon radius vector, k2 is the tidal Love number, and delta is the tidal lag angle) and that this rate has been approximately constant since the late Precambrian. When the contribution to tidal friction from the sun is taken into account, these data imply that the length of the terrestrial day 900 million years ago was approximately18 hours.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sonett -- Kvale -- Zakharian -- Chan -- Demko -- New York, N.Y. -- Science. 1996 Jul 5;273(5271):100-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉C. P. Sonett, Department of Planetary Sciences and Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA. E. P. Kvale, Indiana Geological Survey, Indiana University, Bloomington, IN 47405, USA. A. Zakharian, Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA. M. A. Chan, Department of Geology and Geophysics, University of Utah, Salt Lake City, UT 84112, USA. T. M. Demko, Department of Earth Resources, Colorado State University, Fort Collins, CO 80523, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8688061" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    Common variants spanning PLK4 are associated with mitotic-origin aneuploidy in human embryos (2015)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2015-04-11
    Beschreibung: Aneuploidy, the inheritance of an atypical chromosome complement, is common in early human development and is the primary cause of pregnancy loss. By screening day-3 embryos during in vitro fertilization cycles, we identified an association between aneuploidy of putative mitotic origin and linked genetic variants on chromosome 4 of maternal genomes. This associated region contains a candidate gene, Polo-like kinase 4 (PLK4), that plays a well-characterized role in centriole duplication and has the ability to alter mitotic fidelity upon minor dysregulation. Mothers with the high-risk genotypes contributed fewer embryos for testing at day 5, suggesting that their embryos are less likely to survive to blastocyst formation. The associated region coincides with a signature of a selective sweep in ancient humans, suggesting that the causal variant was either the target of selection or hitchhiked to substantial frequency.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉McCoy, Rajiv C -- Demko, Zachary -- Ryan, Allison -- Banjevic, Milena -- Hill, Matthew -- Sigurjonsson, Styrmir -- Rabinowitz, Matthew -- Fraser, Hunter B -- Petrov, Dmitri A -- R01 GM089926/GM/NIGMS NIH HHS/ -- R01 GM097415/GM/NIGMS NIH HHS/ -- R01 GM100366/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2015 Apr 10;348(6231):235-8. doi: 10.1126/science.aaa3337.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, Stanford University, Stanford, CA, USA. ; Natera, Inc., San Carlos, CA, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25859044" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Alleles ; *Aneuploidy ; Blastomeres ; Embryo, Mammalian/*physiology ; Embryonic Development ; Fathers ; Female ; Fertilization in Vitro ; Genetic Association Studies ; Genetic Testing ; Haplotypes ; Humans ; Male ; *Mitosis ; Mothers ; Phenotype ; *Polymorphism, Single Nucleotide ; Protein-Serine-Threonine Kinases/*genetics/physiology ; Selection, Genetic ; Trophoblasts
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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