Search results for "PFA"
showing 10 items of 46 documents
On the ability of perfluorohexane sulfonate (PFHxS) bioaccumulation by two Pseudomonas sp. strains isolated from PFAS‐contaminated environmental matr…
2020
PFASs (perfluoroalkyl and polyfluoroalkyl substances) are highly fluorinated, aliphatic, synthetic compounds with high thermal and chemical stability as well as unique amphiphilic properties which make them ingredients in a range of industrial processes. PFASs have attracted consideration due to their persistence, toxicity and bioaccumulation tendency in the environment. Recently, attention has begun to be addressed to shorter-chain PFASs, such as perfluorohexane sulfonate [PFHxS], apparently less toxic to and more easily eliminated from lab animals. However, short-chain PFASs represent end-products from the transformation of fluorotelomers whose biotic breakdown reactions have not been ide…
Las familias reconstituidas. Una realidad en continuo crecimiento
2020
Cada vez más parejas que han contraído matrimonio o formalizado su unión se disuelven y vuelven a formar otras familias, las llamadas familias reconstituidas. En ellas se involucran adultos y menores, por lo que necesitan una identidad propia que determine los derechos y obligaciones de cada uno. Aunque nada se ha previsto en el Código civil español, no acontece igual en otros Derechos, como en algunos de los llamados Derechos forales y en los ordenamientos jurídicos de otros países. Partiendo de ello, en este artículo vamos a realizar algunas consideraciones en torno a lo que podría ser su régimen jurídico. More and more couples who have married or formalized their union are dissolving and…
First-trimester maternal concentrations of polyfluoroalkyl substances and fetal growth throughout pregnancy
2019
Background: Several studies have investigated the possible association between prenatal exposure to perfluoroalkyl substances (PFASs) and birth anthropometry. However, none has assessed fetal size longitudinally. We studied the possible association between PFASs and fetal biometry. Methods: In 1230 mother-child pairs of three cohorts from the Spanish INMA-Project, we analyzed perfluorohexanesulfonic acid (PFHxS), perfluorooctanesulfonic acid (PFOS), perfluorooctanoic acid (PFOA), and perfluorononanoic acid (PFNA) in first-trimester maternal plasma (collection: 2003-2008). We measured abdominal circumference (AC), femur length (FL), biparietal diameter (BPD), and estimated fetal weight (EFW)…
Transfer of perfluoroalkyl substances from mother to fetus in a Spanish birth cohort
2015
CSIC Servicio de enlaces(opens in a new window)|Library catalogue(opens in a new window)|View at Publisher| Export | Download | Add to List | More... Environmental Research Volume 142, October 01, 2015, Pages 471-478 Transfer of perfluoroalkyl substances from mother to fetus in a Spanish birth cohort (Article) Manzano-Salgado, C.B.abc , Casas, M.abc, Lopez-Espinosa, M.-J.cd, Ballester, F.cd, Basterrechea, M.cef, Grimalt, J.O.gh, Jiménez, A.-M.ef, Kraus, T.i, Schettgen, T.i, Sunyer, J.abc, Vrijheid, M.abc a Centre for Research in Environmental Epidemiology (CREAL), Doctor Aiguader, 88, Barcelona, Catalonia, Spain b Universitat Pompeu Fabra (UPF), Barcelona, Spain c CIBER Epidemiología y Salu…
Perfluoroalkyl substances and immune cell counts in adults from the Mid-Ohio Valley (USA)
2021
Highlights • The literature on PFASs and circulating levels of immune cells is scarce. • Study of the association between PFASs and white blood cells at two different time points. • Cross-sectional study on the association between PFASs and lymphocyte subsets. • Positive association between PFHxS and total lymphocytes, especially for cell count. • Positive, but less consistent, association between PFOA and PFOS and total lymphocytes.
Aircraft-based observations of isoprene-epoxydiol-derived secondary organic aerosol (IEPOX-SOA) in the tropical upper troposphere over the Amazon reg…
2018
During the ACRIDICON-CHUVA field project (September–October 2014; based in Manaus, Brazil) aircraft-based in situ measurements of aerosol chemical composition were conducted in the tropical troposphere over the Amazon using the High Altitude and Long Range Research Aircraft (HALO), covering altitudes from the boundary layer (BL) height up to 14.4 km. The submicron non-refractory aerosol was characterized by flash-vaporization/electron impact-ionization aerosol particle mass spectrometry. The results show that significant secondary organic aerosol (SOA) formation by isoprene oxidation products occurs in the upper troposphere (UT), leading to increased organic aerosol mass concentratio…
Influx of African biomass burning aerosol during the Amazonian dry season through layered transatlantic transport of black carbon-rich smoke
2020
Black carbon (BC) aerosols influence the Earth's atmosphere and climate, but their microphysical properties, spatiotemporal distribution, and long-range transport are not well constrained. This study presents airborne observations of the transatlantic transport of BC-rich African biomass burning (BB) smoke into the Amazon Basin using a Single Particle Soot Photometer (SP2) as well as several complementary techniques. We base our results on observations of aerosols and trace gases off the Brazilian coast onboard the HALO (High Altitude and LOng range) research aircraft during the ACRIDICON-CHUVA campaign in September 2014. During flight AC19 over land and ocean at the northeastern coastline …
In-situ observations of young contrails – overview and selected results from the CONCERT campaign
2010
Lineshaped contrails were detected with the research aircraft Falcon during the CONCERT – CONtrail and Cirrus ExpeRimenT – campaign in October/November 2008. The Falcon was equipped with a set of instruments to measure the particle size distribution, shape, extinction and chemical composition as well as trace gas mixing ratios of sulfur dioxide (SO<sub>2</sub>), reactive nitrogen and halogen species (NO, NO<sub>y</sub>, HNO<sub>3</sub>, HONO, HCl), ozone (O<sub>3</sub>) and carbon monoxide (CO). During 12 mission flights over Europe, numerous contrails, cirrus clouds and a volcanic aerosol layer were probed at altitudes between 8.5 and 11.6 km…
Differential equations over polynomially bounded o-minimal structures
2002
We investigate the asymptotic behavior at +∞ of non-oscillatory solutions to differential equations y' = G(t, y), t > a, where G: R 1+l → R l is definable in a polynomially bounded o-minimal structure. In particular, we show that the Pfaffian closure of a polynomially bounded o-minimal structure on the real field is levelled.