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    Wyświetlanie 1-6 z 6
    Tytuł:
    Further observations on the bio- and magnetostratigraphy of the J/K boundary interval in southern Ukraine
    Autorzy:
    Wimbledon, William A.P.
    Svobodova, Andrea
    Bakhmutov, Vladimir
    Poliachenko, Ievgen
    Hlavatskyi, Dmytro
    Powiązania:
    https://bibliotekanauki.pl/articles/2127369.pdf
    Data publikacji:
    2022
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    J/K boundary
    Tithonian
    Berriasian calcareous nannofossils
    magnetostratigraphy
    Opis:
    This is an account of finds of stratigraphically useful calcareous nannofossils and the magnetostratigraphy of the Jurassic-Cretaceous boundary interval of the eastern Crimean peninsula (southern Ukraine). We compare these new complementary results with those presented by our team in earlier publications. A missing interval in the Crimean sequence is filled, and the position of the Tithonian-Berriasian (J/K) boundary is confirmed.
    Źródło:
    Geological Quarterly; 2022, 66, 1; art. no. 11
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The proposal of a GSSP for the Berriasian Stage (Cretaceous System): Part 2
    Autorzy:
    Wimbledon, William A.P.
    Reháková, Daniela
    Svobodová, Andrea
    Elbra, Tiiu
    Schnabl, Petr
    Pruner, Petr
    Šifnerová, Krýstina
    Kdýr, Šimon
    Frau, Camille
    Schnyder, Johann
    Galbrun, Bruno
    Vaňková, Lucie
    Dzyuba, Oksana
    Copestake, Philip
    Hunt, Christopher O.
    Riccardi, Alberto
    Poulton, Terry P.
    Bulot, Luc G.
    De Lena, Luis
    Powiązania:
    https://bibliotekanauki.pl/articles/2060930.pdf
    Data publikacji:
    2020
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Cretaceous
    GSSP
    biostratigraphy
    magnetostratigraphy
    Vocontian Basin
    Berriasian stages
    Kreda
    biostratygrafia
    magnetostratygrafia
    Opis:
    In part 1 of this work we discussed the possibilities for the selection of a GSSP for the Berriasian Stage of the Cretaceous System, based on prevailing practical methods for correlation in that J/K interval, traditional usage and the consensus over the best boundary markers that had developed in the last forty years. This consensus has developed further, based on the results of multidisciplinary studies on numerous sites over the last decade. Here in Part 2 we give an account of the application of those results by the Berriasian Working Group (ISCS), and present the stratigraphic evidence that justifies the selection of the locality of Tré Maroua (Hautes-Alpes, SE France) as the proposed GSSP. We describe a 45 m-thick section in the Calcaires Blancs vocontiens – that part of the formation covering the calpionellid Chitinoidella, Remanei. Intermedia, Colomi, Alpina, Ferasini, Elliptica and Simplex biozones. The stratigraphic data collected here has been compiled as part of a wider comparative study of complementary Vocontian Basin sites (with localities at Charens, St Bertrand, Belvedere and Le Chouet). Evidence from Tré Maroua thus sits in this substantial regional biostratigraphic and magnetostratigraphic context. For the purposes of the GSSP definition, here we particularly concentrate on the unbroken sequence and biotic markers in the interval immediately below the boundary, the Colomi Subzone (covering circa 675,000 years), and immediately above, the Alpina Subzone (covering circa 725,000 years). Particularly significant fossil datums identified in the Tré Maroua profile are the primary basal Berriasian marker, the base of the Alpina Subzone (a widespread event marked by dominance of small Calpionella alpina, with rare Crassicollaria parvula and Tintinopsella carpathica): the base of the Berriasian Stage is placed at the base of bed 14, which coincides with the base of the Alpina Subzone. Secondary markers bracketing the base of the Calpionella Zone are the FOs of the calcareous nannofossil species Nannoconus wintereri, close below the boundary, and the FO of Nannoconus steinmannii minor, close above. The Tithonian/Berriasian boundary level occurs within M19n.2n, in common with many documented sites, and is just below the distinctive reversed magnetic subzone M19n.1r (the so-called Brodno reversal). We present data which is congruent with magnetostratigraphic and biostratigraphic data from other key localities in France and in wider regions (Le Chouet, Saint Bertrand, Puerto Escaño, Rio Argos, Bosso, Brodno, Kurovice, Theodosia…), and thus the characteristics and datums identified at Tré Maroua are key for correlation and, in general, they typify the J/K boundary interval in Tethys and connected seas
    Źródło:
    Volumina Jurassica; 2020, 18, 2; 121-160
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    John William Trevan’s concept of Median Lethal Dose (LD50/LC50) – more misused than used
    Autorzy:
    Pillai, S.K.
    Kobayashi, K.
    Michael, M.
    Mathai, T.
    Sivakumar, B.
    Sadasivan, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2098545.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    lethal dose
    toxic substance
    acute toxicity
    Opis:
    Introduction: Median lethal dose (MLD) has been a controversial subject among biologists and animal ethicists since its inception in 1927 by Trevan. Toxicologists use MLD (LD50) as the first step to assess the toxicity of a substance. Animal ethicists criticize LD50 tests because animals suffer pain, and LD50 is irreproducible. The disadvantage of classifying chemicals based on LD50, the importance of the ‘characteristics’ proposed by Trevan, and the ideal mortality range for determining the best estimate of LD50 are also discussed. Objective: The aim of this review was to understand Trevan’s concept of LD50 and the method of Litchfield and Wilcoxon (L and W), and Finney’s probit analysis for LD50 determination Materials and method: A literature survey was conducted using Google search and Pubmed. Simulated data set was used for identifying the ideal mortality range for calculating the ‘best estimate’ of LD50. Brief description of the state of knowledge: After Trevan, the extensively used classical methods for LD50 determination are Finney’s probit analysis and the L and W method. Animal ethicists questioned LD50, because of its irreproducibility. Presently used methods for LD50 tests do not provide information on the dose-response, hence assessing the complete spectrum of toxicity is not possible. However, LD50 is used to classify chemicals. Conclusions: 'The 'characteristic' is more specific than the slope or LD50 of a dose-response curve. LD50 does not manifest the exact nature of the toxicity of a substance; hence, classifying chemicals based on LD50s may have little relevance
    Źródło:
    Journal of Pre-Clinical and Clinical Research; 2021, 15, 3; 137-141
    1898-2395
    Pojawia się w:
    Journal of Pre-Clinical and Clinical Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Health Care Resource Utilization after Acute Ankle Sprains
    Autorzy:
    Bielska, Iwona A.
    Pickett, William
    Brison, Robert
    Brouwer, Brenda
    Johnson, Ana P.
    Powiązania:
    https://bibliotekanauki.pl/articles/635205.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Tematy:
    ankle sprains
    health resources
    productivity loss
    Canada
    Kanada
    urazy stawu skokowego
    utrata zdolności do pracy
    zasoby ochrony zdrowia
    Opis:
    Ankle sprains are common soft-tissue injuries that are often treated in emergency departments. These injuries can have significant consequences for the patient, including long-term morbidity and loss of productivity. The objective of this study was to examine the direct and indirect health resource utilization associated with ankle sprains. 296 adult patients with acute ankle sprains participated in the study in Kingston, Ontario, Canada. Data were collected using a one-month productivity questionnaire. Overall, 11% (95% CI, 8-15%) of the participants visited a physician following the initial emergency department visit. Almost all (95%; 95% CI, 92-97%) of the participants used medications or supportive treatments and 55% (95% CI, 50-61%) reported taking time off from work, school, or housework. The use of unpaid assistance was indicated by 56% (95% CI, 50-62%). Findings from this analysis highlight the significant patient-related and health care system burden of acute ankle sprains.
    Źródło:
    Zdrowie Publiczne i Zarządzanie; 2012, 10, 2; 106-110
    2084-2627
    Pojawia się w:
    Zdrowie Publiczne i Zarządzanie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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