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Wyszukujesz frazę "Iglesias, V." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Structural Equation Modelling in the exploration and analysis of intrauterine environmental exposures with infant health effects
    Autorzy:
    Salgado, M.A.V.
    Bastias, M.
    Schisterman, E.
    Pino, P.
    Bangdiwala, S.
    Iglesias, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2085142.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    structural equation model
    cohort study
    arsenic
    Chile
    intrauterine exposure
    Opis:
    Introduction. In epidemiology, generalized linear models are the main statistical methods used to explore associations. However, the use of other methods such as Structural Equation Modelling (SEM) is gradually increasing. Objective. The aim of the study was to illustrate the use of SEM in the assessment of salivary cortisol concentration in infants as a biomarker of perinatal exposure to inorganic arsenic. Materials and method. This was a cohort study of pregnant women recruited from public health care centres in Arica, Chile, in 2013. Socio-demographic information and urine samples to assess inorganic arsenic were collected during the second trimester of pregnancy. Saliva samples were collected to assess cortisol in infants between 18–24 months of age. Four linear regression models (LRMs) and two SEMs were run to estimate the effect of prenatal exposure to inorganic arsenic on cortisol concentration in infants. Results. According to LRMs and SEMs, prenatal exposure to inorganic arsenic and salivary cortisol were not associated. However, the association between maternal cortisol and cortisol in infants was statistically significant in all models; for each increase in standard deviation of the covariate Ln(maternal cortisol), the outcome Ln(cortisol in infant) increased by 0.49 units of variance in both SEMs. Conclusions. LRMs and SEMs were useful to assess the effect of prenatal exposure to inorganic arsenic on cortisol in infants. However, SEM allowed the adjustment of estimations by an estimated latent that obtained the information about income, occupation, education and ethnicity in a more comprehensive way than achieved by LRM.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2019, 26, 4; 617-622
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Is prenatal arsenic exposure associated with salivary cortisol in infants in Arica, Chile? An exploratory cohort study
    Autorzy:
    Salgado, M.A.V.
    Schisterman, E.
    Pino, P.
    Bangdiwala, S.
    Munoz, M.P.
    Iglesias, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2083226.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    environmental exposure
    arsenic
    pregnant women
    cohort study
    Chile
    Opis:
    Introduction. In animal models, gestational exposure to inorganic arsenic has been associated with higher corticosterone concentration and consequent impairment of stress control in offspring. An equivalent association relating cortisol, a glucocorticoid hormone, in humans has not been previously studied. Objective. The aim of the study was to explore the association between prenatal inorganic arsenic exposure and salivary cortisol in infants from Arica, Chile. Materials and method. A cohort study of 168 mother-child dyads was recruited. In the 2nd trimester of pregnancy, urinary inorganic arsenic was assessed; 18–24 months after delivery, salivary cortisol was measured in the children. Maternal cortisol, maternal depression, stress, and socio-economic status were also evaluated. Results. The adjusted association was estimated with multiple linear regression after evaluating confounding through a directed acyclic graph. Median urinary inorganic arsenic in pregnant women was 14.1 μg/L (IQR: 10.4–21.7) while salivary cortisol in the children was 0.17 μg/L (IQR: 0.11–0.38). Among children from the highest income families (> 614 USD/month), arsenic exposure was associated with salivary cortisol. Children in the third quartile of arsenic exposure had -0.769 units of the logarithm of salivary cortiso, compared with those in the first quartile (p = 0.045). Conclusions. In this sample, prenatal exposure to arsenic was associated with salivary cortisol (third quartile of inorganic arsenic), only in infants belonging the highest income strata (> 614 USD). More studies are needed to confirm these preliminary results.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2019, 26, 2; 266-272
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Salvinialean megaspores in the Late Cretaceous of southern Patagonia, Argentina
    Autorzy:
    Santamarina, P.E.
    Barreda, V.D.
    Iglesias, A.
    Varela, A.N.
    Powiązania:
    https://bibliotekanauki.pl/articles/21754.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    We report here two megaspores species related to the aquatic ferns of the order Salviniales from the Late Cretaceous Mata Amarilla Formation (Austral Basin), southern Santa Cruz Province, Argentina. We identified the species Arcellites disciformis and Balmeisporites cf. B. holodictyus. The presence of A. disciformis, in particular, is significant not only because it represents the first record for the Southern Hemisphere, indicating a bi-hemispheric distribution for the species, but also because it increases the diversity of this genus in Patagonia. The new findings of salvinialean megaspores highlight the importance of water ferns in the Late Cretaceous aquiferous enviroments of southern South America. The common occurrences of Arcellites and Balmeisporites, whether in shallow, fresh or brackish water facies, indicates aquatic paleoenvironment of the Mata Amarilla Formation, as was inferred also from the sedimentological evidence. Their presence also indicates that the lower and middle levels of the Mata Amarilla Formation can be attributed to the megaspore Zone M3 (Albian–Cenomanian) defined for the Cretaceous of Patagonia.
    Źródło:
    Acta Palaeontologica Polonica; 2018, 63, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of CoFeSiB/CoNi, CoFeSiB/FeNi, FeSiB/CoNi, FeSiB/FeNi Biphase Microwires in the Temperature Range 295-1200 K
    Autorzy:
    Iglesias, I.
    El Kammouni, R.
    Chichay, K.
    Perov, N.
    Vazquez, M.
    Rodionova, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1387539.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.60.Ej
    Opis:
    We have studied the magnetic properties of two series of magnetically biphase microwires with 1 μm thickness of CoNi-based hard or FeNi-based soft shells with a core of FeSiB or FeCoSiB glass-coated microwires. The magnetic properties were analyzed as a function of temperature in the range from 295 K to 1200 K using a vibrating sample magnetometer. Analysis of the magnetization reversal of each phase with measuring temperature has been performed.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 591-593
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of growth responses to auxin 1-naphthaleneacetic acid and ethylene precursor 1-aminocyclopropane-1-carboxilic acid in maize seedling root
    Autorzy:
    Alarcon, M.V.
    Lloret, P.G.
    Iglesias, D.J.
    Talon, M.
    Salguero, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/19792.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Application of 1-naphthaleneacetic acid (NAA) or 1-aminocyclopropane-1-carboxilic acid (ACC) to maize roots growing in hydroponic solution inhibited root elongation, and increased radial growth, but the responses to those treatments differed in degree. Auxin was more effective than ACC as an elongation inhibitor and root swelling promoter. Whereas NAA fully inhibited elongation and maintained swelling over 48 h, ACC inhibited elongation partially (50%) and only promoted swelling for 24 h. It is well-known that auxin, like ACC, promotes ethylene production, but similar levels of ethylene production reached by means of NAA or ACC treatments did not elicit the same response, the response being always stronger to NAA than to ACC. These results suggest that the effect of auxin on root growth is not mediated by ethylene. Elongation and swelling of roots appear to be inversely related: usually a reduction in elongation was accompanied by corresponding swelling. However, these two processes showed different sensitivities to growth regulators. After 24 h treatment with 0.5 μM NAA or 5 μM ACC, root elongation was inhibited by 90% and 53% respectively, but the same treatments promoted swelling by 187% and 140% respectively. Furthermore, 1 μM ACC was shown to promote inhibition of root elongation without affecting swelling. The ethylene antagonist STS (silver thiosulfate) did not affect elongation in control or NAAtreated roots, but increased ethylene production and swelling. These results indicate that longitudinal and radial expansion could be independently controlled.
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2012, 54, 1
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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