Bibliografie tematiche / Salmonella regrowth

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Letteratura scientifica selezionata sul tema "Salmonella regrowth"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 20 febbraio 2023

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Articoli di riviste sul tema "Salmonella regrowth"

Rodríguez-López, María Isabel, Vicente M. Gómez-López, Viktorija Lukseviciute e Zivile Luksiene. "Modeling the Inactivation and Possible Regrowth of Salmonella enterica Treated with Chlorophyllin-Chitosan and Visible Light". Food Technology and Biotechnology 58, n. 1 (22 aprile 2020): 64–70. http://dx.doi.org/10.17113/ftb.58.01.20.6374.

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The study focuses on predictive modelling of inactivation of Salmonella enterica after treatment with chlorophyllin-chitosan complex and visible light. Salmonella cells were incubated with chlorophyllin-chitosan complex (0.001 % chlorophyllin and 0.1 % chitosan) for different times (5-60 min) and then illuminated with visible light (λ=405 nm, He=38 J/cm2). Inactivation curves and post-treatment regrowth curves were built based on microbiological viability tests and data were fitted to ten inactivation and two regrowth models. The photoactivated complex reduced Salmonella population, which were unable to regrow. Weibull and Baranyi models were the best to describe the inactivation and regrowth kinetics respectively. In conclusion, data from the kinetic analysis and predictive modelling confirmed that photoactivated chlorophyllin-chitosan complex is a promising non-thermal approach for inactivation of Gram-negative pathogens, since no bacterial regrowth after treatment has been predicted.

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Burge, Wylie D., Nancy K. Enkiri e David Hussong. "Salmonella regrowth in compost as influenced by substrate (salmonella regrowth in compost)". Microbial Ecology 14, n. 3 (novembre 1987): 243–53. http://dx.doi.org/10.1007/bf02012944.

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Gözen, İrep, e Banu Örmeci. "Effect of daylight on regrowth of bacteria in anaerobically digested sludge". Water Science and Technology 62, n. 2 (1 luglio 2010): 364–69. http://dx.doi.org/10.2166/wst.2010.268.

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This study investigated the regrowth of total coliform, Salmonella, and Clostridium perfringens in anaerobically digested sludge after centrifuge dewatering in the presence and absence of daylight. Sludge cake and centrate samples were collected from a treatment plant, and half of the samples was stored in daylight and the other half was stored in dark for three weeks. The bacteria levels in the cake and centrate samples were measured periodically throughout the storage period, and all three bacteria showed substantial regrowth. Presence of daylight increased the regrowth of Salmonella both in sludge cake and centrate, and increased the regrowth of total coliform in centrate. Salmonella exhibited the highest regrowth rate in cake among the three bacteria tested both in the presence and absence of light. Daylight did not appear to have a significant impact on the regrowth of Clostridium perfringens in cake and centrate, and on the regrowth of total coliform in cake. This might, however, be caused by the masking effect of the higher initial numbers of these bacteria in the samples. There is need for more research to thoroughly understand the effect of daylight on the regrowth of sludge bacteria.

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Gerba, Charles P., Nohelia Castro-del Campo, John P. Brooks e Ian L. Pepper. "Exposure and risk assessment of Salmonella in recycled residuals". Water Science and Technology 57, n. 7 (1 aprile 2008): 1061–65. http://dx.doi.org/10.2166/wst.2008.235.

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The potential health effects of Salmonella found in wastewater residuals is dependent on the exposure of individuals to the organism. This paper provides a risk assessment for human infection from Salmonella due to direct contact with Class B biosolids, and from contact with Class A biosolids following regrowth of Salmonella. In addition, a risk assessment is provided for infection via airborne transport of bioaerosols from Class B biosolids and biosolids in which regrowth had occurred, to off-site communities. Results of the risk characterization imply that the risk of human infection from direct contact with Class B land applied residuals and subsequent ingestion is low. In contrast, the risk from direct contact with Class A residuals following regrowth is greater. Risks from airborne transport of Salmonella via bioaerosols away from a Class B land application site are also low. However, once again the risk from aerosols resulting from biosolids in which regrowth had occurred was greater. Based on these analyses, we conclude that it is highly unlikely that Salmonella infections will occur from land applied Class A or B residuals. However, risks become significant if Class A biosolids are stored anaerobically i.e. saturated, prior to land application.

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Eamens, G. J., A. M. Waldron e P. J. Nicholls. "Survival of pathogenic and indicator bacteria in biosolids applied to agricultural land". Soil Research 44, n. 7 (2006): 647. http://dx.doi.org/10.1071/sr06015.

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Concentrations of surviving Escherichia coli, Clostridium perfringens, and Salmonella spp. were determined temporally in mechanically dewatered biosolids derived from anaerobic–mesophilic digestion and applied to agricultural land. Following applications in different seasons, repeated assessments of bacterial concentrations in biosolid clumps, using most-probable-number (MPN) techniques, found sustained high levels of these bacteria. Bacterial concentrations were often well above soil background levels at 6 months, and in some cases 11–12 months, after land application. Survival in surface-applied biosolids was similar to that for biosolids incorporated into the soil, and between application rates of 10 or 30 dry t/ha. Salmonella concentrations in applied biosolids were not predicted from, and could exceed those of, the indicator organism E. coli. Multiple plot analyses indicated regrowth of E. coli and Salmonella can occur within biosolids, up to several months after application. However, Salmonella serovars likely to pose a significant risk to animal health were not detected among isolates from the dewatered biosolids. Reduced accessibility for grazing livestock by soil incorporation, together with the time taken for normal pasture establishment practices, and the limited pathogenicity of the vast majority of salmonellae present in biosolids may significantly reduce the risk of spread of these organisms to the human food chain.

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AL-Gheethi, Adel A. S., I. Norli e Mohd Omar Ab Kadir. "Elimination of enteric indicators and pathogenic bacteria in secondary effluents and lake water by solar disinfection (SODIS)". Journal of Water Reuse and Desalination 3, n. 1 (1 marzo 2013): 39–46. http://dx.doi.org/10.2166/wrd.2013.060.

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The reduction of enteric indicators (fecal coliforms (FC) and Enterococcus faecalis) and elimination of pathogenic bacteria (Salmonella spp. and Staphylococcus aureus) in the secondary effluents and lake water by solar disinfection (SODIS) was studied in this article. FC, E. faecalis, Salmonella spp. and S. aureus were isolated and enumerated using membrane filtration techniques after SODIS of samples inside transparent polyethylene terephthalate (PET) bottles for 1, 2, 3, 4, 5, 6, 7 and 8 h. The results show that SODIS can reduce numbers of FC, Salmonella spp. and S. aureus by more than 4 log10 colony forming units (CFU)/100 mL after 6 h. However, regrowth of these bacteria was observed after the incubation of the treated samples at 37 °C for 24 h, whereas SODIS for 8 h would eliminate pathogenic bacteria and no regrowth would be observed in these samples as determined by an absence and presence technique using enrichment medium. E. faecalis was not eliminated in the secondary effluents and lake water by SODIS, but this bacterium was reduced to less than detection limits (1 CFU/100 mL) when the treated secondary effluent samples were stored for 16 days at room temperature. The elimination of pathogenic bacteria and reduction of enteric indicators resulted in undetectable levels using SODIS for secondary effluents and lake water.

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Sidhu, J. "The role of indigenous microorganisms in suppression of salmonella regrowth in composted biosolids". Water Research 35, n. 4 (marzo 2001): 913–20. http://dx.doi.org/10.1016/s0043-1354(00)00352-3.

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Sidhu, J., R. A. Gibbs, G. E. Ho e I. Unkovich. "Selection of Salmonella Typhimurium as an indicator for pathogen regrowth potential in composted biosolids". Letters in Applied Microbiology 29, n. 5 (novembre 1999): 303–7. http://dx.doi.org/10.1046/j.1365-2672.1999.00626.x.

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Peng, Linda X., Morgan Wallace, Bridget Andaloro, Dawn Fallon, Lois Fleck, Dan Delduco e George Tice. "Modification of the BAX® System PCR Assay for Detecting Salmonella in Beef, Produce, and Soy Protein Isolate". Journal of AOAC INTERNATIONAL 94, n. 1 (1 gennaio 2011): 172–78. http://dx.doi.org/10.1093/jaoac/94.1.172.

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Abstract The BAX® System PCR assay for Salmonella detection in foods was previously validated as AOAC Research Institute (RI) Performance Tested MethodSM (PTM) 100201. New studies were conducted on beef and produce using the same media and protocol currently approved for the BAX System PCR assay for E. coli O157:H7 multiplex (MP). Additionally, soy protein isolate was tested for matrix extension using the U.S. Food and Drug Administration-Bacteriological Analytical Manual (FDA-BAM) enrichment protocols. The studies compared the BAX System method to the U.S. Department of Agriculture culture method for detecting Salmonella in beef and the FDA-BAM culture method for detecting Salmonella in produce and soy protein isolate. Method comparison studies on low-level inoculates showed that the BAX System assay for Salmonella performed as well as or better than the reference method for detecting Salmonella in beef and produce in 8–24 h enrichment when the BAX System E. coli O157:H7 MP media was used, and soy protein isolate in 20 h enrichment with lactose broth followed by 3 h regrowth in brain heart infusion broth. An inclusivity panel of 104 Salmonella strains with diverse serotypes was tested by the BAX System using the proprietary BAX System media and returned all positive results. Ruggedness factors involved in the enrichment phase were also evaluated by testing outside the specified parameters, and none of the factors examined affected the performance of the assay.

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Morishige, Yuta, Atsushi Koike, Ai Tamura-Ueyama e Fumio Amano. "Induction of Viable but Nonculturable Salmonella in Exponentially Grown Cells by Exposure to a Low-Humidity Environment and Their Resuscitation by Catalase". Journal of Food Protection 80, n. 2 (24 gennaio 2017): 288–94. http://dx.doi.org/10.4315/0362-028x.jfp-16-183.

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ABSTRACTSalmonella is a major cause of foodborne disease that sometimes occurs in massive outbreaks around the world. This pathogen is tolerant of low-humidity conditions. We previously described a method for induction of viable but nonculturable (VBNC) Salmonella enterica serovar Enteritidis by treatment with hydrogen peroxide (H2O2) and subsequent resuscitation with 0.3 mM sodium pyruvate. Here, we report a new method for the induction of the VBNC state in Salmonella Enteritidis cells, one involving dehydration. Exposure of Salmonella Enteritidis cells to dehydration stress under poor nutritional conditions (0.9% [wt/vol] NaCl) and 10 to 20% relative humidity at room temperature decreased the presence of culturable population to 0.0067%, but respiratory and glucose uptake active populations were maintained at 0.46 and 1.12%, respectively, meaning that approximately 1% may have entered the VBNC state. Furthermore, these VBNC cells could be resuscitated to acquire culturability by incubation with catalase in M9 minimal medium without glucose in a manner dependent on the dose of catalase but not sodium pyruvate. These results suggest that a low-humidity environment could cause Salmonella Enteritidis cells to enter the VBNC state and the cells could then be resuscitated for growth by treatment with catalase, suggesting a potential risk of Salmonella Enteritidis to survive in low water activity foods in the VBNC state and to start regrowth for foodborne illness.

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Più fonti

Tesi sul tema "Salmonella regrowth"

Mann, Cindy Mary, of Western Sydney Hawkesbury University e Faculty of Science and Technology. "Salmonella regrowth potential of two sewage sludge products". THESIS_FST_XXX_Mann_C.xml, 1997. http://handle.uws.edu.au:8081/1959.7/361.

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The disposal of sewage sludge is becoming an ever-increasing problem and a range of re-use options are being developed, with traditional composting and advanced alkaline stabilisation emerging as priority re-use alternatives in NSW. However, concerns have been raised regarding the dissemination of sludge related pathogens in the environment. Salmonella spp pose the greatest risk since they have the ability to proliferate in the absence of human and animal hosts. Composting processes eliminate salmonellae from sludge, but the opportunity for post-processing recontamination is considerable. This project examined the significance of post-processing recontamination of Salmonella broughton, introduced into composted sludge and N-Virosoil. In compost, inactivation rates of S. broughton showed an inverse relationship with simulated processing temperatures, with competitive exclusion by autocthonous compost flora thought to be the major mechanism of inhibition. S. broughton numbers were reduced to below the limits of detection after several weeks. S. broughton inactivation was also assessed in processed N-Virosoil and was found to be more immediate. It was concluded that both compost and N.Virosoil products have a low potential to support the regrowth of Salmonella spp.
Master of Science (Hons)(Environmental Science)

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Mann, C. M. "Salmonella regrowth potential of two sewage sludge products /". View thesis View thesis, 1997. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030521.100917/index.html.

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Thesis (M.Sc. (Hons)) - University of Western Sydney, Hawkesbury.
"A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science (Hons.) (Environmental Science" --tp.

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Elving, Josefine. "Pathogen inactivation and regrowth in organic waste during biological treatment /". SLU : Dept. of Biomedical Sciences and Veterinary Public Health, Swedish University of Agricultural Sciences, 2009. http://epsilon.slu.se/11652700.pdf.

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Qi, Yinan. "Effect of centrifugal dewatering on the regrowth of fecal coliforms and Salmonella in anaerobically digested biosolids". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 192 p, 2008. http://proquest.umi.com/pqdweb?did=1601522491&sid=2&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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Thesis (Ph.D.)--University of Delaware, 2008.
Principal faculty advisors: Steven K. Dentel, Dept. of Civil & Environmental Engineering; and Diane S. Herson, Dept. of Biological Sciences. Includes bibliographical references.

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Mann, Cindy Mary. "Salmonella regrowth potential of two sewage sludge products". Thesis, 1997. http://handle.uws.edu.au:8081/1959.7/361.

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Libri sul tema "Salmonella regrowth"

D, Burge W., e Water Engineering Research Laboratory, a cura di. Regrowth of salmonellae in composted sewage sludge. Cincinnati, OH: U.S. Environmental Protection Agency, Water Engineering Research Laboratory, 1987.

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