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Anomalie platynowców w historii Ziemi

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Wieczorek A., Brachaniec T.
Acta Societatis Metheoriticae Polonorum
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2016
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vol. 7
177-181
EN
The platinum-group elements comprise a very small percentage of elements in the earth’s crust. The primary sources of them are meteorite impacts and volcanism. The study of PGEs anomaly in sediment profiles as a possible indicator of impact began in 1980, when was suggested a link between high levels of iridium and the mass extinction event in Late Cretaceous.
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Możliwy wpływ materii pozaziemskiej na bioróżnorodność ordowickich szkarłupni – dane wstępne

81%
Brachaniec T., Salamon M. A., Karwowski Ł., Wieczorek A.
Acta Societatis Metheoriticae Polonorum
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2016
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vol. 7
13-16
EN
The Ordovician was a period with large meteorite showers, what was confirmed by fossil chondrite finds in Swedish limestones. In Bukówka section near Kielce deposits of the same age are exposed. During field works was noticed that echinoderms do not occur in three samples. It was proved that echinoderms were very sensitive to environmental changes and their disappearance was associated with a meteorite falls.
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Comparison of antibiotic resistance and virulence between biofilm-producing and non-producing clinical isolates of Enterococcus faecium

61%
Sieńko A., Wieczorek P., Majewski P., Ojdana D., Wieczorek A., Olszańska D., Tryniszewska E.
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2015
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vol. 62
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issue 4
859-866
EN
An increase in the antibiotic resistance among Enterococcus faecium strains has been observed worldwide. Moreover, this bacteria has the ability to produce several virulence factors and to form biofilm that plays an important role in human infections. This study was designed to compare the antibiotic resistance and the prevalence of genes encoding surface protein (esp), aggregation substance (as), surface adhesin (efaA), collagen adhesin (ace), gelatinase (gelE), and hialuronidase (hyl) between biofilm-producing and non-producing E. faecium strains. Therefore, ninety E. faecium clinical isolates were tested for biofilm-forming ability, and then were assigned to two groups: biofilm-positive (BIO+, n =70) and biofilm-negative (BIO-, n = 20). Comparison of these groups showed that BIO+ isolates were resistant to β-lactams, whereas 10% of BIO- strains were susceptible to ampicillin (statistically significant difference, p = 0.007) and 5% to imipenem. Linezolid and tigecycline were the only antibiotics active against all tested isolates. Analysis of the virulence factors revealed that ace, efaA, and gelE genes occurred more frequently in BIO- strains (ace in 50% BIO+ vs. 75% BIO-; efaA 44.3% vs. 85%; gelE 2.9% vs. 15%, respectively), while hyl gene appeared more frequently in BIO+ isolates (87.1% BIO+ vs. 65% BIO-). These differences were significant (p < 0.05). We concluded that BIO+ strains were more resistant to antibiotics than BIO- strains, but interestingly, BIO- isolates were characterized by possession of higher virulence capabilities.
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