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  1. AU="Katerina Demnerova"
  2. AU="Sorrentino, I"
  3. AU="Pogge von Strandmann, Elke"
  4. AU="Lenzi, Kerry A"
  5. AU="Sakakura, Akira"
  6. AU="Nowell, Sian"
  7. AU="Mirko Cortese"
  8. AU="Klein, Steffen"
  9. AU="Koike, Toru"
  10. AU="Hung, Chung-Yu"
  11. AU="Muendlein, Hayley I"
  12. AU="Papavramidis, Theodosios"

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  1. Artikel ; Online: Application of Nanopore Sequencing (MinION) for the Analysis of Bacteriome and Resistome of Bean Sprouts

    Milada Solcova / Katerina Demnerova / Sabina Purkrtova

    Microorganisms, Vol 9, Iss 937, p

    2021  Band 937

    Abstract: The aspiration these days is to apply rapid methods for parallel analysis of bacteriome and resistome of food samples to increase food safety and prevent antibiotic resistance genes (ARGs) spreading. In this work, we used nanopore sequencing (NS) to ... ...

    Abstract The aspiration these days is to apply rapid methods for parallel analysis of bacteriome and resistome of food samples to increase food safety and prevent antibiotic resistance genes (ARGs) spreading. In this work, we used nanopore sequencing (NS) to determine the diversity and dynamics of the microbiome and resistome in two types of bean sprouts. We proved that NS provided an easy, quick, and reliable way to identify the microbiome and resistome of a food sample also. The species diversity obtained by NS and by cultivation methods with MALDI-TOF MS identification was comparable. In both samples, before and after cultivation (30 °C, 48 h), the dominant part of bacteriome formed Gammaproteobacteria ( Enterobacteriaceae, Erwiniaceae, Pseudomonadaceae, Moraxellaceae ) and then Firmicutes ( Streptococcaceae ). The diversity and abundance of single ARGs groups were comparable for both samples despite bacteriome differences. More than 50% of the detected ARGs alignments were mutations conferring resistance to aminoglycosides (16S rRNA), resistance to fluoroquinolones ( gyr A, gyr B, par C, par D) and elfamycin (EF-Tu). ARGs encoding efflux pumps formed more than 30% of the detected alignments. Beta-lactamases were represented by many variants, but were less abundant.
    Schlagwörter spread of antibiotic resistance ; antibiotic resistance genes ; food chain ; food safety ; nanopore sequencing ; MinION ; Biology (General) ; QH301-705.5
    Thema/Rubrik (Code) 590
    Sprache Englisch
    Erscheinungsdatum 2021-04-01T00:00:00Z
    Verlag MDPI AG
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  2. Artikel ; Online: Boswellia serrata Extract as an Antibiofilm Agent against C andida spp.

    Petr Jaroš / Maria Vrublevskaya / Kristýna Lokočová / Jana Michailidu / Irena Kolouchová / Kateřina Demnerová

    Microorganisms, Vol 10, Iss 171, p

    2022  Band 171

    Abstract: The use of antibiotics or antifungals to control infections caused by pathogenic microorganisms is currently insufficiently effective because of their emerging resistance. Thanks to the ability of microorganisms to form a biofilm and thus increase their ... ...

    Abstract The use of antibiotics or antifungals to control infections caused by pathogenic microorganisms is currently insufficiently effective because of their emerging resistance. Thanks to the ability of microorganisms to form a biofilm and thus increase their resistance to administered drugs even more, modern medicine faces the task of finding novel substances to combat infections caused by them. In this regard, the effects of essential oils or plant extracts are often studied. Among the relatively neglected plants is Boswellia serrata , which has a high content of biologically active boswellic acids. In this study, we focused on one of the most common nosocomial infections, which are caused by Candida species. The most common representative is C. albicans , although the number of infections caused by non-albicans species has recently been increasing. We focused on the antifungal activity of Boswellia serrata extract Bioswellix against planktonic and adhering cells of Candida albicans , Candida parapsilosis and Candida krusei. The antifungal activity against adhering cells was further explored by determining the metabolic activity of cells (MTT) and determining the total amount of biofilm using crystal violet. Boswellic acid-containing plant extract was shown to suppress the growth of a suspension population of all tested Candida species. Boswellia serrata extract Bioswellix was most effective in inhibiting C. albicans biofilm formation.
    Schlagwörter Candida albicans ; Candida krusei ; Candida parapsilosis ; boswellic acid ; fluconazole ; biofilm ; Biology (General) ; QH301-705.5
    Sprache Englisch
    Erscheinungsdatum 2022-01-01T00:00:00Z
    Verlag MDPI AG
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  3. Artikel ; Online: Boswellic Acids as Effective Antibacterial Antibiofilm Agents

    Petr Jaroš / Elizaveta Timkina / Jana Michailidu / Dominik Maršík / Markéta Kulišová / Irena Kolouchová / Kateřina Demnerová

    Molecules, Vol 27, Iss 3795, p

    2022  Band 3795

    Abstract: Boswellic acids are biologically active pentacyclic terpenoid compounds derived from Boswellia sp. plants. Extracts containing these acids have a number of positive effects on human health, especially in the treatment of inflammation, arthritis, or ... ...

    Abstract Boswellic acids are biologically active pentacyclic terpenoid compounds derived from Boswellia sp. plants. Extracts containing these acids have a number of positive effects on human health, especially in the treatment of inflammation, arthritis, or asthma. With increasing resistance to common antibiotics, boswellic acid-containing extracts could serve as an alternative or work in synergy with commonly available preparations. This study aims to determine the effect of boswellic acids on suspension cells and biofilms of Staphylococcus epidermidis , Enterococcus faecalis , and Escherichia coli. The antimicrobial and antibiofilm effect found was compared with commonly available antibiotics to control these undesirable microorganisms. The synergistic effect of boswellic acids and common antibiotics on the growth of these microorganisms was also determined. All tested microorganisms showed a positive additive effect of antibiotics and boswellic acid extract. The most significant effect was found in Enterococcus faecalis ATCC 29212 in a combination of 0.2 × MIC80 erythromycin (0.2 mg/L) and 0.8 × MIC80 boswellic acid extract (16 mg/L).
    Schlagwörter boswellic acid ; microbial biofilm ; bacterial biofilm ; antibacterial ; FIC ; antibiotic ; Organic chemistry ; QD241-441
    Thema/Rubrik (Code) 540
    Sprache Englisch
    Erscheinungsdatum 2022-06-01T00:00:00Z
    Verlag MDPI AG
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  4. Artikel ; Online: Impact of Long-Term Manure and Sewage Sludge Application to Soil as Organic Fertilizer on the Incidence of Pathogenic Microorganisms and Antibiotic Resistance Genes

    Hana Stiborova / Martina Kracmarova / Tereza Vesela / Marta Biesiekierska / Jindrich Cerny / Jiri Balik / Katerina Demnerova

    Agronomy, Vol 11, Iss 1423, p

    2021  Band 1423

    Abstract: The reuse of stabilized (under thermophilic conditions) sewage sludge and manure on agricultural soils is a common practice. The aim of this study was to evaluate the risks associated with their repeated applications on the spread of pathogenic bacteria ... ...

    Abstract The reuse of stabilized (under thermophilic conditions) sewage sludge and manure on agricultural soils is a common practice. The aim of this study was to evaluate the risks associated with their repeated applications on the spread of pathogenic bacteria and antibiotic resistance genes (ARGs) that encode resistance to tetracycline ( tetA and tetW ), sulphonamide ( sul1 and sul2 ), erythromycin ( ermB ), vancomycin ( vanA ) and integron genetic element ( intI1 ). The trial fields has been regularly fertilized every 3rd year since 1996 with manure (MF; 330 kg N/ha) and sewage sludge (SF; 330 kg N/ha and SF3; 990 kg N/ha). Unfertilized soil (CF) served as a control. Samples were collected at different time points: (i) right before fertilization (which was also 3 years after the last fertilization), (ii) 5 months after fertilization, and (iii) 11 months after fertilization. The relative abundance of amplicon sequence variants (ASVs) assigned to potentially pathogenic bacteria was low (0.3% and 0.25% in sludge and manure, respectively), and no association with the application of these fertilizers was found. On the other hand, our data indicate that an increased relative abundance of the ARGs sul1 and tetW was significantly associated with these fertilizer applications, and sul1 was increased in all treatments regardless of the time. It is suggested that sul1 should be monitored in organically fertilized soils to prevent its spread and possible further accumulation in crops.
    Schlagwörter sludge ; manure ; antibiotic resistance ; pathogenic bacteria ; soil ; Agriculture ; S
    Thema/Rubrik (Code) 630
    Sprache Englisch
    Erscheinungsdatum 2021-07-01T00:00:00Z
    Verlag MDPI AG
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  5. Artikel ; Online: Soil microbial communities following 20 years of fertilization and crop rotation practices in the Czech Republic

    Martina Kracmarova / Ondrej Uhlik / Michal Strejcek / Jirina Szakova / Jindrich Cerny / Jiri Balik / Pavel Tlustos / Petr Kohout / Katerina Demnerova / Hana Stiborova

    Environmental Microbiome, Vol 17, Iss 1, Pp 1-

    2022  Band 18

    Abstract: Abstract Background Although fertilization and crop rotation practices are commonly used worldwide in agriculture to maximize crop yields, their long-term effect on the structures of soil microorganisms is still poorly understood. This study investigated ...

    Abstract Abstract Background Although fertilization and crop rotation practices are commonly used worldwide in agriculture to maximize crop yields, their long-term effect on the structures of soil microorganisms is still poorly understood. This study investigated the long-term impact of fertilization and crop rotation on soil microbial diversity and the microbial community structure in four different locations with three soil types. Since 1996, manure (MF; 330 kg N/ha), sewage sludge (SF; 330 and SF3x; 990 kg N/ha), and NPK (NPK; 330 kg N/ha) fertilizers were periodically applied to the soils classified as chernozem, luvisol and cambisol, which are among the most abundant or fertile soils used for agricultural purposes in the world. In these soils, potato (Solanum tuberosum L.), winter wheat (Triticum aestivum L.), and spring barley (Hordeum vulgare L.) were rotated every three years. Results Soil chemistry, which was significantly associated with location, fertilization, crop rotation, and the interaction of fertilization and location, was the dominant driver of soil microbial communities, both prokaryotic and fungal. A direct effect of long-term crop rotation and fertilization on the structure of their communities was confirmed, although there was no evidence of their influence on microbial diversity. Fungal and bacterial communities responded differently to fertilization treatments; prokaryotic communities were only significantly different from the control soil (CF) in soils treated with MF and SF3x, while fungal communities differed across all treatments. Indicator genera were identified for different treatments. These taxa were either specific for their decomposition activities or fungal plant pathogens. Sequential rotation of the three crops restricted the growth of several of the indicator plant pathogens. Conclusions Long-term fertilization and crop rotation significantly altered microbial community structure in the soil. While fertilization affected soil microorganisms mainly through changes in nutrient profile, ...
    Schlagwörter Manure ; Sewage sludge ; NPK fertilizers ; Microbial diversity ; Community structure ; Chernozem ; Environmental sciences ; GE1-350 ; Microbiology ; QR1-502
    Thema/Rubrik (Code) 630
    Sprache Englisch
    Erscheinungsdatum 2022-03-01T00:00:00Z
    Verlag BMC
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  6. Artikel ; Online: Antimicrobial Properties of Palladium and Platinum Nanoparticles

    Ondrej Chlumsky / Sabina Purkrtova / Hana Michova / Hana Sykorova / Petr Slepicka / Dominik Fajstavr / Pavel Ulbrich / Jitka Viktorova / Katerina Demnerova

    International Journal of Molecular Sciences, Vol 22, Iss 7892, p

    A New Tool for Combating Food-Borne Pathogens

    2021  Band 7892

    Abstract: Although some metallic nanoparticles (NPs) are commonly used in the food processing plants as nanomaterials for food packaging, or as coatings on the food handling equipment, little is known about antimicrobial properties of palladium (PdNPs) and ... ...

    Abstract Although some metallic nanoparticles (NPs) are commonly used in the food processing plants as nanomaterials for food packaging, or as coatings on the food handling equipment, little is known about antimicrobial properties of palladium (PdNPs) and platinum (PtNPs) nanoparticles and their potential use in the food industry. In this study, common food-borne pathogens Salmonella enterica Infantis, Escherichia coli , Listeria monocytogenes and Staphylococcus aureus were tested. Both NPs reduced viable cells with the log 10 CFU reduction of 0.3–2.4 (PdNPs) and 0.8–2.0 (PtNPs), average inhibitory rates of 55.2–99% for PdNPs and of 83.8–99% for PtNPs. However, both NPs seemed to be less effective for biofilm formation and its reduction. The most effective concentrations were evaluated to be 22.25–44.5 mg/L for PdNPs and 50.5–101 mg/L for PtNPs. Furthermore, the interactions of tested NPs with bacterial cell were visualized by transmission electron microscopy (TEM). TEM visualization confirmed that NPs entered bacteria and caused direct damage of the cell walls, which resulted in bacterial disruption. The in vitro cytotoxicity of individual NPs was determined in primary human renal tubular epithelial cells (HRTECs), human keratinocytes (HaCat), human dermal fibroblasts (HDFs), human epithelial kidney cells (HEK 293), and primary human coronary artery endothelial cells (HCAECs). Due to their antimicrobial properties on bacterial cells and no acute cytotoxicity, both types of NPs could potentially fight food-borne pathogens.
    Schlagwörter palladium nanoparticles ; platinum nanoparticles ; antimicrobial properties ; food-borne pathogens ; minimum inhibitory concentrations ; acute cytotoxicity ; Biology (General) ; QH301-705.5 ; Chemistry ; QD1-999
    Sprache Englisch
    Erscheinungsdatum 2021-07-01T00:00:00Z
    Verlag MDPI AG
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  7. Artikel ; Online: Benefits of Polyamide Nanofibrous Materials

    Simona Lencova / Kamila Zdenkova / Vera Jencova / Katerina Demnerova / Klara Zemanova / Radka Kolackova / Kristyna Hozdova / Hana Stiborova

    Nanomaterials, Vol 11, Iss 2, p

    Antibacterial Activity and Retention Ability for Staphylococcus Aureus

    2021  Band 480

    Abstract: Although nanomaterials are used in many fields, little is known about the fundamental interactions between nanomaterials and microorganisms. To test antimicrobial properties and retention ability, 13 electrospun polyamide (PA) nanomaterials with ... ...

    Abstract Although nanomaterials are used in many fields, little is known about the fundamental interactions between nanomaterials and microorganisms. To test antimicrobial properties and retention ability, 13 electrospun polyamide (PA) nanomaterials with different morphology and functionalization with various concentrations of AgNO 3 and chlorhexidine (CHX) were analyzed. Staphylococcus aureus CCM 4516 was used to verify the designed nanomaterials’ inhibition and permeability assays. All functionalized PAs suppressed bacterial growth, and the most effective antimicrobial nanomaterial was evaluated to be PA 12% with 4.0 wt% CHX (inhibition zones: 2.9 ± 0.2 mm; log 10 suppression: 8.9 ± 0.0; inhibitory rate: 100.0%). Furthermore, the long-term stability of all functionalized PAs was tested. These nanomaterials can be stored at least nine months after their preparation without losing their antibacterial effect. A filtration apparatus was constructed for testing the retention of PAs. All of the PAs effectively retained the filtered bacteria with log 10 removal of 3.3–6.8 and a retention rate of 96.7–100.0%. Surface density significantly influenced the retention efficiency of PAs ( p ≤ 0.01), while the effect of fiber diameter was not confirmed ( p ≥ 0.05). Due to their stability, retention, and antimicrobial properties, they can serve as a model for medical or filtration applications.
    Schlagwörter polyamide ; nanofiber ; permeability ; filtration apparatus ; antimicrobial activity ; Staphylococcus aureus ; Chemistry ; QD1-999
    Thema/Rubrik (Code) 571
    Sprache Englisch
    Erscheinungsdatum 2021-02-01T00:00:00Z
    Verlag MDPI AG
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  8. Artikel ; Online: Microbial Contamination of Photographic and Cinematographic Materials in Archival Funds in the Czech Republic

    Sabina Purkrtova / Dana Savicka / Jana Kadava / Hana Sykorova / Nikola Kovacova / Dominika Kalisova / Tereza Nesporova / Martina Novakova / Barbora Masek Benetkova / Lucie Koukalova / Stepanka Boryskova / Blanka Hnulikova / Michal Durovic / Katerina Demnerova

    Microorganisms, Vol 10, Iss 155, p

    2022  Band 155

    Abstract: In this study we investigated the microbial contamination of 126 samples of photographic and cinematographic materials from 10 archival funds in the Czech Republic. Microorganisms were isolated from the light-sensitive layer by swabbing it with a ... ...

    Abstract In this study we investigated the microbial contamination of 126 samples of photographic and cinematographic materials from 10 archival funds in the Czech Republic. Microorganisms were isolated from the light-sensitive layer by swabbing it with a polyurethane sponge. Microbial isolates were identified by MALDI-TOF MS (bacteria) or by phenotype testing and microscopy (fungi). Bacterial contamination was more abundant and more diverse than fungal contamination, and both were significantly associated with archives. The most frequently isolated fungal genera were Cladosporium , Eurotium , Penicillium, Aspergillus and Alternaria. The most frequently isolated bacteria were Gram-positive genera such as Staphylococcus , Micrococcus , Kocuria , Streptococcus and Bacillus . This bacterial and fungal diversity suggests that air is the main vehicle of contamination. We also analysed the impact of the type of material used for the carrier (paper, baryta paper, cellulose acetate and nitrate or glass) or the light-sensitive layer (albumen, gelatine, collodion and other) on the level and diversity of microbial contamination. Carriers such as polyester and cellulose nitrate may have a negative impact on bacterial contamination, while paper and baryta paper may have a partially positive impact on both fungal and bacterial contamination.
    Schlagwörter photographic materials ; cinematographic materials ; archival funds ; Czech Republic ; microbial contamination ; fungal contamination ; Biology (General) ; QH301-705.5
    Thema/Rubrik (Code) 660
    Sprache Englisch
    Erscheinungsdatum 2022-01-01T00:00:00Z
    Verlag MDPI AG
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  9. Artikel ; Online: Response of Soil Microbes and Soil Enzymatic Activity to 20 Years of Fertilization

    Martina Kracmarova / Hana Kratochvilova / Ondrej Uhlik / Michal Strejcek / Jirina Szakova / Jindrich Cerny / Pavel Tlustos / Jiri Balik / Katerina Demnerova / Hana Stiborova

    Agronomy, Vol 10, Iss 1542, p

    2020  Band 1542

    Abstract: Fertilization is a worldwide agricultural practice used in agronomy to increase crop yields. Fertilizer application influences overall soil characteristics, including soil microbial community composition and metabolic processes mediated by microbial ... ...

    Abstract Fertilization is a worldwide agricultural practice used in agronomy to increase crop yields. Fertilizer application influences overall soil characteristics, including soil microbial community composition and metabolic processes mediated by microbial enzymatic activity. Changes in the structure of microbial communities and their metabolic activity after long-term fertilization were studied in this research. We hypothesized that the different types of fertilization regimes affect nutrient levels in the soil which subsequently influence the metabolic processes and microbial diversity and community structure. Manure (MF; 330 kg N/ha), sewage sludge at two application doses (SF; 330 kg N/ha and SF3x; 990 kg N/ha) and chemical (NPK; N-P-K nutrients in concentrations of 330-90-300 kg/ha) fertilizers have been applied regularly to an experimental field since 1996. The microbial diversity increased in all soils amended with both organic (MF, SF, SF3x) and chemical (NPK) fertilizers. The shifts in microbial communities were observed, which were mainly caused by less abundant genera that were mostly associated with one or more fertilization treatment(s). Fertilization also influenced soil chemistry and the activity of β-xylosidase, β-N-acetylglucosaminidase (NAG), acid phosphatase and FDA-hydrolases. Specifically, all fertilization treatments were associated with a higher activity of β xylosidase and lower NAG activity. Only the NPK treatment was associated with a higher activity of acid phosphatase.
    Schlagwörter enzymatic activity ; β-glucosidase ; β-xylosidase ; β-N-acetylglucosaminidase ; acid phosphatase ; fluorescein diacetate hydrolysis ; Agriculture ; S
    Thema/Rubrik (Code) 630
    Sprache Englisch
    Erscheinungsdatum 2020-10-01T00:00:00Z
    Verlag MDPI AG
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  10. Artikel ; Online: Bacterial Biotransformation of Pentachlorophenol and Micropollutants Formed during Its Production Process

    Eglantina Lopez-Echartea / Tomas Macek / Katerina Demnerova / Ondrej Uhlik

    International Journal of Environmental Research and Public Health, Vol 13, Iss 11, p

    2016  Band 1146

    Abstract: Pentachlorophenol (PCP) is a toxic and persistent wood and cellulose preservative extensively used in the past decades. The production process of PCP generates polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) as ... ...

    Abstract Pentachlorophenol (PCP) is a toxic and persistent wood and cellulose preservative extensively used in the past decades. The production process of PCP generates polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) as micropollutants. PCDD/Fs are also known to be very persistent and dangerous for human health and ecosystem functioning. Several physico-chemical and biological technologies have been used to remove PCP and PCDD/Fs from the environment. Bacterial degradation appears to be a cost-effective way of removing these contaminants from soil while causing little impact on the environment. Several bacteria that cometabolize or use these pollutants as their sole source of carbon have been isolated and characterized. This review summarizes current knowledge on the metabolic pathways of bacterial degradation of PCP and PCDD/Fs. PCP can be successfully degraded aerobically or anaerobically by bacteria. Highly chlorinated PCDD/Fs are more likely to be reductively dechlorinated, while less chlorinated PCDD/Fs are more prone to aerobic degradation. The biochemical and genetic basis of these pollutants’ degradation is also described. There are several documented studies of effective applications of bioremediation techniques for the removal of PCP and PCDD/Fs from soil and sediments. These findings suggest that biodegradation can occur and be applied to treat these contaminants.
    Schlagwörter pentachlorophenol ; polychlorinated dibenzo-p-dioxins ; polychlorinated dibenzofurans ; bioremediation ; wood preservation ; contaminated soil ; bacterial degradation ; Medicine ; R
    Sprache Englisch
    Erscheinungsdatum 2016-11-01T00:00:00Z
    Verlag MDPI AG
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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