1. |
2. V-ORAL17c: Cationic Covalent Organic Polymer for Bacterial Cell Detection by Electrochemical Impedance SpectroscopyTina Skorjanc, Andraz Mavric, Mads Nybo Sorensen, Gregor Mali, Changzhu Wu, Matjaž Valant, 2022 Ključne besede: Electrochemical impedance spectroscopy, polymers, Menshutkin reaction, porphyrin, sensor
Objavljeno: 30.11.2022; Ogledov: 2261; Prenosov: 0
Ogledov v tednu: 1146 |
3. |
4. Localization, ligand environment, bioavailability and toxicity of mercury in Boletus spp. and Scutiger pes-caprae mushroomsAnja 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 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.
Ključne besede: edible mushrooms, HgSe complex, imaging of elemental distribution, LA-ICP-MS, alpha-XRF, XAS
Objavljeno: 24.10.2019; Ogledov: 3979; Prenosov: 0
Ogledov v tednu: 628 |
5. |
6. Bum bum nad AvčamiZoran Božič, 2008 Opis: Dne 31. marca 1908. Movrnov boršt, dobre pol ure hoje iz Avč proti Banjšicam. Hladno spomladansko jutro, a napoveduje se jasen, sončen dan. Janez Kolenc iz Gorenjega Avščka ima opravke v gozdu in s seboj je vzel šestletnega sina, da tudi njega vzgoji v pridnega delavca. Ura je 8.45. Nenadoma zasliši močno šumenje in žvižganje, ozira se okrog, a ne vidi nič. Šum narašča in traja, traja. Preplašeni sinek se stisne k očetu. Nenadoma nekaj trešči v drevo, kakšnih štirideset metrov v blagem bregu pod njim, in Janez opazi pet centimetrov debelo vejo, ki se hrešče odlomi, v bližini jablane pa se vzdigne oblaček prahu. Kolenc je radoveden, a boji se približati drevesu, tudi zaradi na smrt prestrašenega otroka, ki ga priganja, naj odideta domov. Skrbni oče posluša sina, a doma mu radovednost ne da miru. Popoldne poišče bližnjega prijatelja, s katerim sta bila skupaj v vojski, in nemudoma pohitita v Boršte. Ob jablani najdeta jamico, obkroženo z ožganim listjem, in začneta kopati. Trideset centimetrov globoko ju čaka presenečenje: svetleč kovinski predmet, podoben ledvički, dolg za ped in težak dober kilogram. Skrbno ga zavijeta, spravita v malho in pohitita v Avče.
Ključne besede: astronomija, meteorit Avče, Avstro-Ogrska, Soška dolina, Naravoslovni muzej Dunaj, Italija, topovska krogla
Objavljeno: 26.09.2016; Ogledov: 4478; Prenosov: 27
 Povezava na datoteko
Ogledov v tednu: 452 |
7. A method for quantification of mineral dust in air based on optical absorption of particles concentrated by a virtual impactor and a device performing the said methodLuka Drinovec, Griša Močnik, Iasonas Stavroulas, Spiros Bezantakos, Michael Pikridas, Florin Unga, Jean Sciare, 2024 Opis: The present invention belongs to the field of devices and methods for measurement of particle concentration, more precisely to the field of devices and methods for quantification of particles based on their physical characteristics, especially with the use of optical means. The invention relates to a method for determination of ambient mineral dust concentration based on optical absorption of particles concentrated by a virtual impactor as well as a device performing the said method. The method comprises the following steps:- Sampling air samples with particle size smaller than 1 µm (PM1) and sampling air samples with particle size up to 10 µm;- Concentrating the samples with particle sizes up to 10 µm with a virtual impactor;- Measuring optical absorption of collected samples at least one wavelength from UV to IR spectre, preferably from 370 to 950 nm, most preferably at 370 nm;- Subtracting the absorption of the samples with particle size smaller than 1 µm from the absorption of the sample concentrated by the virtual impactor.
Ključne besede: dust, black carbon, aerosols
Objavljeno: 24.04.2024; Ogledov: 651; Prenosov: 2
Povezava na datoteko
Ogledov v tednu: 188 |
8. |
9. |
10. |