Naslov
Characterization of bacteria in nickel-rich kaolinite, montmorillonite, and saponite mixture form Gornje Orešje, Croatia

Autori
Bermanec, Vladimir ; Hrenović, Jasna ; Kazazić, Snježana ; van Wilpe, Erna ; Venter, Chantelle ; Botha, André

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, kratko priopćenje, znanstveni

Izvornik
9th Mid-European Clay Conference Conference Book / Tibljaš, Darko - Zagreb : Hrvatski geološki institut, 2018, 17-17

ISBN
978-953-6907-71-7

Skup
9th Mid-European Clay Conference (MECC 2018)

Mjesto i datum
Zagreb, Hrvatska, 17.09.2018. - 21.09.2018

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
bacteria ; clay ; environment

Sažetak
A sample of nickel (Ni)-rich clay from Gornje Orešje (POSILOVIĆ, 2009), Croatia was analysed mineralogically and bacteriologically. The light greyish-green sample of alteration product of peridotite mother rocks was recognized as a mixture of kaolinite, montmorillonite, saponite and negligible quantity of quartz and calcite. The abundance of total heterotrophic bacteria grown at 22°C was 7.0±0.8 log colony-forming unit (CFU)/mL of wet clay. The population of carbapenem-resistant bacteria grown at 35°C was present at abundance of 3.9±0.6 log CFU/mL. According to the Bruker MALDI-TOF MS analysis, the population of carbapenem-resistant bacteria was represented by Stenotrophomonas sp. with intrinsic resistance, and Pseudomonas sp. with acquired resistance to carbapenems. The results suggest that Ni-rich clay is a habitat of dense bacterial population, including those resistant to last-resort antibiotics. Scanning Electron Microscopy analysis (Fig. 1) confirmed that bacteria were mostly restricted to the edges of montmorillonite sheets, which probably represent the sites of easy access of bacteria to the cations present in mineral.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Biologija

POVEZANOST RADA