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Localization, ligand environment, bioavailability and toxicity of mercury in Boletus spp. and Scutiger pes-caprae mushrooms
Anja Kavčič, Klemen Mikuš, Marta Debeljak, Johannes Teun van Elteren, Iztok Arčon, Alojz Kodre, Peter Kump, Andreas-Germanos Karydas, Alessandro Migliori, Mateusz Czyzycki, Katarina Vogel-Mikuš, 2019, izvirni znanstveni članek

Opis: This study provides information on mercury (Hg) localization, speciation and ligand environment in edible mushrooms: Boletus edulis, B. aereus and Scutiger pes-caprae collected at non-polluted and Hg polluted sites, by LA-ICP-MS, SR-μ-XRF and Hg L3-edge XANES and EXAFS. Mushrooms (especially young ones) collected at Hg polluted sites can contain more than 100 μg Hg g−1 of dry mass. Imaging of the element distribution shows that Hg accumulates mainly in the spore-forming part (hymenium) of the cap. Removal of hymenium before consumption can eliminate more than 50% of accumulated Hg. Mercury is mainly coordinated to di-thiols (43–82%), followed by di-selenols (13–35%) and tetra-thiols (12–20%). Mercury bioavailability, as determined by feeding the mushrooms to Spanish slugs (known metal bioindicators owing to accumulation of metals in their digestive gland), ranged from 4% (S. pes-caprae) to 30% (B. aereus), and decreased with increasing selenium (Se) levels in the mushrooms. Elevated Hg levels in mushrooms fed to the slugs induced toxic effects, but these effects were counteracted with increasing Se concentrations in the mushrooms, pointing to a protective role of Se against Hg toxicity through HgSe complexation. Nevertheless, consumption of the studied mushroom species from Hg polluted sites should be avoided.
Najdeno v: osebi
Ključne besede: edible mushrooms, HgSe complex, imaging of elemental distribution, LA-ICP-MS, alpha-XRF, XAS
Objavljeno: 24.10.2019; Ogledov: 2182; Prenosov: 0
.pdf Polno besedilo (1,79 MB)

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Simultaneous ternary extension of DNA catalyzed by a trimeric replicase assembled in vivo
Alejandro Hochkoeppler, Alessandro Perrone, Alessandro Ceccarelli, Fabrizio Dal Piaz, Alessandra Stefan, Fabio Lapenta, Alejandro Montón Silva, 2015, izvirni znanstveni članek

Opis: According to current models, dimeric DNA Polymerases coordinate the replication of DNA leading and lagging strands. However, it was recently shown that trimeric DNA Polymerases, assembled in vitro, replicate the lagging strand more efficiently than dimeric replicases. Here we show that the τ, α, ε, and θ subunits of Escherichia coli DNA Polymerase III can be assembled in vivo, yielding the trimeric τ3α3ε3θ3 complex. Further, we propose a molecular model of this complex, whose catalytic action was investigated using model DNA substrates. Our observations indicate that trimeric DNA replicases reduce the gap between leading and lagging strand synthesis.
Najdeno v: osebi
Ključne besede: Trimeric DNA Polymerase, E. coli, DNA Polymerase III, τ3α3ε3θ3 complex, Triple DNA extension
Objavljeno: 27.01.2021; Ogledov: 1047; Prenosov: 0
.pdf Polno besedilo (1,85 MB)

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Polymer-based nano-composites for thermal insulation
Manisha Chhikara, Alessandro Fraleoni-Morgera, 2019, pregledni znanstveni članek

Najdeno v: osebi
Ključne besede: nano-composites, polymers, thermal insulation
Objavljeno: 13.07.2021; Ogledov: 957; Prenosov: 0

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In poetry, if meter has to help memory, it takes its time
Alessandro Treves, Sara Andreetta, Oleksandra Soldatkina, Vezha Boboeva, 2021, izvirni znanstveni članek

Najdeno v: osebi
Ključne besede: memory, poetry, meter, Italian poetry
Objavljeno: 04.11.2021; Ogledov: 560; Prenosov: 19
URL Polno besedilo (0,00 KB)
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Meter as a mnemonic device
Alessandro Treves, Sara Andreetta, Yair Lakretz, 2019, objavljeni povzetek znanstvenega prispevka na konferenci

Najdeno v: osebi
Ključne besede: meter, memory, Italian poetry, Dante
Objavljeno: 05.11.2021; Ogledov: 568; Prenosov: 19
URL Polno besedilo (0,00 KB)
Gradivo ima več datotek! Več...

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