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Giovanni Cenci  - - - 
Top co-authors See all
Silvia Meniconi

73 shared publications

Dipartimento di Ingegneria Civile ed Ambientale, The University of Perugia, Perugia, Italy

B. Brunone

55 shared publications

Dipartimento di Ingegneria Civile ed Ambientale, The University of Perugia, Perugia, Italy

A. Corsetti

45 shared publications

Faculty of Bioscience and Technology for Food, Agriculture and Environment, University of Teramo, Italy

Ermanno Federici

33 shared publications

Laboratory of Microbiology, Department of Chemistry, Biology and Biotechnology, University of Perugia, Perugia, Italy

Elisa Mazzetti

6 shared publications

Dipartimento di Ingegneria Civile ed Ambientale, University of Perugia, 06123 Perugia, Italy

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Distribution of Articles published per year 
(1977 - 2017)
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21
 
Publications See all
Article 4 Reads 1 Citation Food-Associated Lactobacillus plantarum and Yeasts Inhibit the Genotoxic Effect of 4-Nitroquinoline-1-Oxide Roberta Prete, Rosanna Tofalo, Ermanno Federici, Aurora Ciar... Published: 28 November 2017
Frontiers in Microbiology, doi: 10.3389/fmicb.2017.02349
DOI See at publisher website PubMed View at PubMed ABS Show/hide abstract
Lactic acid bacteria and yeasts, representing the prevailing microbiota associated with different foods generally consumed without any cooking, were identified and characterized in vitro for some functional properties, such as acid-bile tolerance and antigenotoxic activity. In particular, 22 Lactobacillus plantarum strains and 14 yeasts were studied. The gastro-intestinal tract tolerance of all the strains was determined by exposing washed cell suspensions at 37°C to a simulated gastric juice (pH 2.0), containing pepsin (0.3% w/v) and to a simulated small intestinal juice (pH 8.0), containing pancreatin (1 mg mL-1) and bile extract (0.5%), thus monitoring changes in total viable count. In general, following a strain-dependent behavior, all the tested strains persisted alive after combined acid-bile challenge. Moreover, many strains showed high in vitro inhibitory activity against a model genotoxin, 4-nitroquinoline-1-oxide (4-NQO), as determined by the short-term method, SOS-Chromotest. Interestingly, the supernatants from bacteria- or yeasts-genotoxin co-incubations exhibited a suppression on SOS-induction produced by 4-NQO on the tester strain Escherichia coli PQ37 (sfiA::lacZ) exceeding, in general, the value of 75%. The results highlight that food associated microorganisms may reach the gut in viable form and prevent genotoxin DNA damage in situ. Our experiments can contribute to elucidate the functional role of food-associated microorganisms general recognized as safe ingested with foods as a part of the diet.
Article 3 Reads 0 Citations Legionella Survey in the Plumbing System of a Sparse Academic Campus: A Case Study at the University of Perugia Ermanno Federici, Silvia Meniconi, Elisa Ceci, Elisa Mazzett... Published: 01 September 2017
Water, doi: 10.3390/w9090662
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We have monitored the presence of bacteria belonging to the genus Legionella in the plumbing of buildings at the University of Perugia (Italy). More than 300 water samples were collected from 156 control-point taps in 41 buildings comprised in the eight campuses of the University. Legionella was absent in most samples, while it was found in only 12 buildings (29% of the total). Molecular analysis indicated the presence of L. pneumophila (serogroups 1, 8 and 6–10), L. taurinensis and L. anisa. In only three cases contamination levels were above the limit at which remedial actions are required, according to international guidelines. In two buildings, where the water temperature could be raised and maintained above 60 °C, thermal disinfection was effective in eradicating Legionella. Conversely, in buildings where contaminations were caused by heat exchangers that produced hot water at a maximum temperature of 50 °C, a chemical disinfection with silver hydrogen peroxide was carried out but was effective only in the short term. In this case study, Legionella contaminations and remediation effectiveness strongly depended on the network and heating-system characteristics, indicating how a multidisciplinary approach that integrates microbiological analysis with hydraulic surveys is necessary for an effective definition of Legionella prevention and control strategies.
Article 4 Reads 1 Citation Bacterial Composition, Genotoxicity, and Cytotoxicity of Fecal Samples from Individuals Consuming Omnivorous or Vegetari... Ermanno Federici, Roberta Prete, Camilla Lazzi, Nicoletta Pe... Published: 28 February 2017
Frontiers in Microbiology, doi: 10.3389/fmicb.2017.00300
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This study analyzes the composition of viable fecal bacteria and gut toxicology biomarkers of 29 healthy volunteers, who followed omnivorous, lacto-ovo-vegetarian, or vegan diets. In particular, the research was focused on the prevalence of some representative viable bacteria from the four dominant phyla (Firmicutes, Bacteroidetes, Proteobacteria, Actinobacteria) commonly present in human feces, in order to evaluate the relationship between microorganisms selected by the habitual dietary patterns and the potential risk due to fecal water (FW) genotoxicity and cytotoxicity, considered as biomarkers for cancer risk and protective food activity. The relative differences of viable bacteria among dietary groups were generally not statistically significant. However, compared to omnivores, lacto-ovo-vegetarians showed low levels of total anaerobes. Otherwise, vegans showed total anaerobes counts similar to those of omnivores, but with lower number of bifidobacteria and the highest levels of bacteria from the Bacteroides–Prevotella genera. FW genotoxicity of lacto-ovo-vegetarians resulted significantly lower either in relation to that of omnivores and vegans. Lacto-ovo-vegetarians also showed the lowest levels of cytotoxicity, while the highest were found for vegans. These results highlighted that lacto-ovo-vegetarian diet was particularly effective in a favorable modulation of microbial activity, thus contributing to a significant reduction of the genotoxic and cytotoxic risk in the gut.
PROCEEDINGS-ARTICLE 7 Reads 0 Citations Legionella monitoring in building’s water distribution systems: the case study of a sparse University campus Silvia Meniconi, Ermanno Federici, Bruno Brunone, Elisa Ceci... Published: 16 November 2016
Proceedings of The 1st International Electronic Conference on Water Sciences, doi: 10.3390/ecws-1-d001
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This paper investigates the presence of Legionella in the water distribution systems of buildings of the University of Perugia (Italy). Further, as the genus Legionella comprises many different species and serogroups, of which L. pneumophila sg1 is the most often associated to human lung infections, a molecular characterization of the retrieved Legionella isolates is reported. Legionella was monitored by standard methods analyzing more than 300 water samples collected from 100 taps throughout the university campus. Legionella was absent in the great majority of the samples, while it was found in only five buildings of the entire campus. Molecular analysis indicated that the contaminations were only partially ascribed to L. pneumophila sg1, as other serogroups (sg8 and sg10) as well as other species (L. taurinensis and L. anisa) were also found. Further, in only three cases the levels of contamination were above the limit at which, according to international guidelines, remedial actions are required. In particular, a thermal disinfection, i.e., raising the water temperature above the level at which Legionella cells do not survive, was applied to the hot water supply systems where high temperature could be maintained throughout. On the contrary, in a building in which Legionella contamination originated inside the heat exchanger, a chemical disinfection with silver hydrogen peroxide was carried out. The case study herein reported indicates how a multidisciplinary approach that integrates microbiological analysis with the survey of building’s plumbing systems can lead to the definition of effective strategies for Legionella prevention and control.
Article 3 Reads 1 Citation In Vitro Inhibition of 4-Nitroquinoline-1-Oxide Genotoxicity by Probiotic Lactobacillus rhamnosus IMC501 Alessandro Bocci, Bartolomeo Sebastiani, Francesca Trotta, E... Published: 28 October 2015
Journal of Microbiology and Biotechnology, doi: 10.4014/jmb.1501.01086
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Article 1 Read 10 Citations Characterization of the Skin Microbiota in Italian Stream Frogs (Rana italica) Infected and Uninfected by a Cutaneous Pa... Ermanno Federici, Roberta Rossi, Laura Fidati, Romina Paracu... Published: 15 September 2015
Microbes and Environments, doi: 10.1264/jsme2.ME15041
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In human and wildlife populations, the natural microbiota plays an important role in health maintenance and the prevention of emerging infectious diseases. In amphibians, infectious diseases have been closely associated with population decline and extinction worldwide. Skin symbiont communities have been suggested as one of the factors driving the different susceptibilities of amphibians to diseases. The activity of the skin microbiota of amphibians against fungal pathogens, such as Batrachochytrium dendrobatidis, has been examined extensively, whereas its protective role towards the cutaneous infectious diseases caused by Amphibiocystidium parasites has not yet been elucidated in detail. In the present study, we investigated, for the first time, the cutaneous microbiota of the Italian stream frog (Rana italica) and characterized the microbial assemblages of frogs uninfected and infected by Amphibiocystidium using the Illumina next-generation sequencing of 16S rRNA gene fragments. A total of 629 different OTUs belonging to 16 different phyla were detected. Bacterial populations shared by all individuals represented only one fifth of all OTUs and were dominated by a small number of OTUs. Statistical analyses based on Bray-Curtis distances showed that uninfected and infected specimens had distinct cutaneous bacterial community structures. Phylotypes belonging to the genera Janthinobacterium, Pseudomonas, and Flavobacterium were more abundant, and sometimes almost exclusively present, in uninfected than in infected specimens. These bacterial populations, known to exhibit antifungal activity in amphibians, may also play a role in protection against cutaneous infectious diseases caused by Amphibiocystidium parasites.
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