Browsing by Author "Ševců Alena"
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- ItemA poly(3-hydroxybutyrate)-chitosan polymer conjugate for the synthesis of safer gold nanoparticles and their applications(Royal Society of Chemistry, 2018) Silvestri Daniele; Waclawek Stanislaw Witold; Sobel Bartłomiej; Torres Mendieta Rafael Omar; Novotný Vít; Nguyen Nhung Anh Huynh; Ševců Alena; Vellora Thekkae Padil Vinod; Müllerová Jana; Stuchlík Martin; Petrangeli Papini Marco; Černík Miroslav; Varma RajendraA facile and eco-friendly approach is developed for the synthesis of a poly(3-hydroxybutyrate)–chitosan (PHB–chit) polymer conjugate, which is an ideal material for the synthesis of safer gold nanoparticles (nAu). The synthesized products are characterized by various electron-based, optical and spectroscopic techniques including the catalytic activity and the stability/toxicity of nAu. In contrast to the conventional synthesis approaches, the use of PHB–chit results in generation of a highly stable and size-controlled nAu material that exhibits important catalytic activity towards the reduction of 4-nitrophenol (4-NP) to 4-aminophenol, and at the same time shows no toxicity against living bacterial systems such as Escherichia coli or Staphylococcus aureus. The synthesis route reported herein would inspire future developments that circumvent toxicity issues of relevance to living systems while performing common catalytic experimentation.
- ItemAn across&ndashspecies comparison of the sensitivity of different organisms to Pb&ndash based perovskites used in solar cells(Elsevier, 2020) Nguyen Nhung Anh Huynh; Rosická Petra; Ševců Alena
- ItemAdvanced Nano-Bio Technologies for Water and Soil Treatment(Springer, 2020) Parma Petr; Ševců Alena; Černík Miroslav
- ItemAnaerobic microbial corrosion of canister material(2019) Cernousek Tomas; Jakub Kokinda; Sihelská Kristína; Shrestha Rojina; Ševců Alena
- ItemAnaerobic microbial corrosion of carbon steel under conditions relevant for deep geological repository of nuclear waste(2021) Shrestha Rojina; Černoušek Tomáš; Stoulil Jan; Kovářová Hana; Sihelská Kristína; Špánek Roman; Ševců Alena; Steinová Jana
- ItemApplication of Molecular Genetic Methods for Study of Biodegradation Processes of Chlorinated Hydrocarbons in Groundwater(2016) Dolinová Iva; Špánek Roman; Ševců Alena; Dvořák Lukáš
- ItemAttached and planktonic bacterial communities on bio-based plasticgranules and micro-debris in seawater and freshwater(Elsevier, 2021) Nguyen Nhung Anh Huynh; El-Temsah Yehia Sayed Ismail; Hrabák Pavel; Borůvka Martin; Kejzlar Pavel; Bakalova Totka; Ševců Alena
- ItemBehaviour of Ag and Si-graphite nanomaterials in environmental and extreme conditions(2016) Waclawek Stanislaw; Vellora Thekkae Padil Vinod; Nguyen Nhung Anh Huynh; Calais Jean-François; Ševců Alena; Černík Miroslav
- ItemBiodegradation of High Concentration of Aliphatic Hydrocarbons in Soil from a Petroleum Refinery: Implications for Applicability of New Actinobacterial Strains(2018) Hrabák Pavel; Czinnerová Marie; Ševců Alena; Kakosová Eva
- ItemBiological effects of four iron-containing nanoremediation materials on the green alga Chlamydomonas sp.(Elsevier Inc., 2018) Nguyen Nhung Anh Huynh; Nadia Moos; Ševců AlenaAs nanoremediation strategies for in-situ groundwater treatment extend beyond nanoiron-based applications to adsorption and oxidation, ecotoxicological evaluations of newly developed materials are required. The biological effects of four new materials with different iron (Fe) speciations ([i] FerMEG12 - pristine flake-like milled Fe(0) nanoparticles (nZVI), [ii] Carbo-Iron® - Fe(0)-nanoclusters containing activated carbon (AC) composite, [iii] Trap-Ox® Fe-BEA35 (Fe-zeolite) - Fe-doped zeolite, and [iv] Nano-Goethite - ‘pure’ FeOOH) were studied using the unicellular green alga Chlamydomonas sp. as a model test system. Algal growth rate, chlorophyll fluorescence, efficiency of photosystem II, membrane integrity and reactive oxygen species (ROS) generation were assessed following exposure to 10, 50 and 500 mg L−1 of the particles for 2 h and 24 h. The particles had a concentration-, material- and time-dependent effect on Chlamydomonas sp., with increased algal growth rate after 24 h. Conversely, significant intracellular ROS levels were detected after 2 h, with much lower levels after 24 h. All Fe-nanomaterials displayed similar Z-average sizes and zeta-potentials at 2 h and 24 h. Effects on Chlamydomonas sp. decreased in the order FerMEG12 > Carbo-Iron® > Fe-zeolite > Nano-Goethite. Ecotoxicological studies were challenged due to some particle properties, i.e. dark colour, effect of constituents and a tendency to agglomerate, especially at high concentrations. All particles exhibited potential to induce significant toxicity at high concentrations (500 mg L−1), though such concentrations would rapidly decrease to mg or µg L−1 in aquatic environments, levels harmless to Chlamydomonas sp. The presented findings contribute to the practical usage of particle-based nanoremediation in environmental restoration.
- ItemCombined scaffolds based on silk fibroin and hydroxyapatite for use in orthopedy(2020) Poláková Dagmar; Víchová Iva; Schaabová Markéta; Martinová Lenka; Ševců Alena
- ItemComposite yarns with antibacterial nanofibrous sheaths produced by collectorless alternating-current electrospinning for suture applications(Wiley, 2021) Madheswaran Divyabharathi; Sivan Manikandan; Valtera Jan; Kuželová Košťáková Eva; Egghe Tim; Asadian Mahtab; Novotný Vít; Nguyen Nhung Anh Huynh; Ševců Alena; Morent Rino; Degeyter Nathalie; Lukáš David
- ItemDDT degradation efficiency and ecotoxicological effects of two types of nano-sized zero-valent iron (nZVI) in water and soil(Elsevier, 2016) El-Temsah Yehia; Ševců Alena; Bobčíková Kateřina; Černík Miroslav; Joner Erik J.
- ItemDeciphering indigenous bacteria in compacted bentonite through a novel and efficient DNA extraction method: insights into biogeochemical processes within the Deep Geological Disposal of nuclear waste concept(Elsevier, 2020) Shrestha Rojina; Ševců Alena; Špánek Roman
- ItemDifferent effects of nano-scale and micro-scale zero-valent iron particles on planktonic microorganisms from natural reservoir water(Royal Society of Chemistry (RSC), 2018) Nguyen Nhung Anh Huynh; Špánek Roman; Vlková Denisa; Řeháková Hana; Kejzlar Pavel; Ševců Alena
- ItemDiscovering the potential of an nZVI-biochar composite as a material for the nanobioremediation of chlorinated solvents in groundwater: Degradation efficiency and effect on resident microorganisms(Elsevier, 2021) Semerád Jaroslav; Ševců Alena; Nguyen Nhung Anh Huynh; Hrabák Pavel; Špánek Roman; Bobčíková Kateřina; Pospíšková Kristýna; Filip Jan; Medřík Ivo; Kašlík Josef; Šafařík Ivo; Filipová Alena; Nosek Jaroslav; Pivokonský Martin; Cajthaml Tomáš
- ItemDual-modality self-heating and antibacterial polymer-coated nanoparticles for magnetic hyperthermia(2016) Darwish Mohamed; Nguyen Nhung Anh Huynh; Ševců Alena; Stibor Ivan; Smoukov Stoyan K.
- ItemDynamics of organohalide-respiring bacteria and their genes following in-situ chemical oxidation of chlorinated ethenes and biostimulation(2016) Dolinová Iva; Czinnerová Marie; Dvořák Lukáš; Stejskal Vojtěch; Ševců Alena; Černík Miroslav
- ItemECOTOXICITY OF ORGANOMETAL HALIDE PEROVSKITES TESTED ON PSEUDOMONAS PUTIDA(Tanger Ltd., 2016) Rosická Petra; Nguyen Nhung Anh Huynh; Ševců Alena; Lederer Tomáš; Rysová Miroslava
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