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Listeria monocytogenes

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https://www.readbyqxmd.com/read/28214695/the-effects-of-atmospheric-pressure-cold-plasma-treatment-on-microbiological-physical-chemical-and-sensory-characteristics-of-vacuum-packaged-beef-loin
#1
A Bauer, Y Ni, S Bauer, P Paulsen, M Modic, J L Walsh, F J M Smulders
Effects on vacuum packaged and non-packaged beef longissimus samples exposed to atmospheric cold plasma (ACP) generated at different powers were studied over a 10day period of vacuum-, and a subsequent 3day period of aerobic storage. Exposure of non-covered beef samples under high power ACP conditions resulted in increased a*, b*, Chroma and Hue values, but ACP treatment of packaged loins did not impact colour (L*, a*, b*, Chroma, Hue), lipid peroxidation, sarcoplasmic protein denaturation, nitrate/nitrite uptake, or myoglobin isoform distribution...
February 8, 2017: Meat Science
https://www.readbyqxmd.com/read/28213502/monocytes-are-the-predominate-cell-type-associated-with-listeria-monocytogenes-in-the-gut-but-they-do-not-serve-as-an-intracellular-growth-niche
#2
Grant S Jones, Sarah E F D'Orazio
After foodborne transmission of the facultative intracellular bacterial pathogen Listeria monocytogenes, most of the bacterial burden in the gut is extracellular. However, we previously demonstrated that intracellular replication in an as yet unidentified cell type was essential for dissemination and systemic spread of L. monocytogenes In this article, we show that the vast majority of cell-associated L. monocytogenes in the gut were adhered to Ly6C(hi) monocytes, a cell type that inefficiently internalized L...
February 17, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28213035/influence-of-electro-activated-solutions-of-weak-organic-acid-salts-on-microbial-quality-and-overall-appearance-of-blueberries-during-storage
#3
Viacheslav Liato, Riadh Hammami, Mohammed Aïder
The aim of this work was to study the potential of diluted electro-activated solutions of weak organic acid salts (potassium acetate, potassium citrate and calcium lactate) to extend the shelf life of blueberries during post-harvest storage. The sanitizing capacity of these solutions was studied against pathogenic bacteria Listeria monocytogenes and E. coli O157:H7 as well as phytopathogenic fungi A. alternata, F. oxysporum and B. cinerea. The results showed that a 5-min treatment of inoculated blueberries with electro-activated solutions resulted in a 4 log CFU/g reduction in Listeria monocytogenes for all solutions...
June 2017: Food Microbiology
https://www.readbyqxmd.com/read/28213034/antimicrobial-treatments-to-control-listeria-monocytogenes-in-queso-fresco
#4
António Lourenço, Mary B Kamnetz, Camila Gadotti, Francisco Diez-Gonzalez
Queso fresco, is a Hispanic non-fermented cheese highly susceptible to contamination with L. monocytogenes. This research was aimed to determine the effect of GRAS antimicrobial ingredients to control L. monocytogenes. Antimicrobials included caprylic acid (CA), Nisaplin(®) (N, 2.5% nisin), a mixture of sodium lactate and sodium diacetate (SL/SD), Lactococcus lactis sbp. lactis DPC 3147, monolaurin, and lactic acid (LA). Batches of queso fresco curds were inoculated with 10(4) CFU/g and stored at 4 °C for three weeks...
June 2017: Food Microbiology
https://www.readbyqxmd.com/read/28213030/high-hydrostatic-pressure-effects-on-listeria-monocytogenes-and-l-innocua-evidence-for-variability-in-inactivation-behaviour-and-in-resistance-to-pediocin-bacha-6111-2
#5
Carolina Bruschi, Norton Komora, Sónia Marília Castro, Jorge Saraiva, Vânia Borges Ferreira, Paula Teixeira
The effect of high hydrostatic pressure (HHP) on the survival of 14 strains of Listeria monocytogenes from food or clinical origins, selected to represent different pheno and genotypes, was evaluated. Stationary phase cells were submitted to 300, 400 and 500 MPa at 10 °C, for 5 min. A high variability in the resistance of L. monocytogenes to pressure was observed, and particularly two strains isolated from food were significantly more baroresistant than the rest. Strains of L. monocytogenes resistant to one or more antibiotics exhibited significantly higher levels of survival after the high pressure treatment at 400 MPa...
June 2017: Food Microbiology
https://www.readbyqxmd.com/read/28213023/inactivation-of-escherichia-coli-o157-h7-salmonella-typhimurium-and-listeria-monocytogenes-in-ready-to-bake-cookie-dough-by-gamma-and-electron-beam-irradiation
#6
Seul-Gi Jeong, Dong-Hyun Kang
This study was conducted to investigate the efficacy of gamma and electron beam irradiation to inactivate foodborne pathogens in ready-to-bake cookie dough and to determine the effect on quality by measuring color and texture changes. Cookie dough inoculated with Escherichia coli O157:H7, Salmonella Typhimurium, or Listeria monocytogenes was subjected to gamma and electron beam irradiation, with doses ranging from 0 to 3 kGy. As the radiation dose increased, the inactivation effect increased among all tested pathogens...
June 2017: Food Microbiology
https://www.readbyqxmd.com/read/28213022/prevalence-genetic-diversity-and-antimicrobial-resistance-of-listeria-monocytogenes-isolated-from-fresh-and-smoked-fish-in-poland
#7
Kinga Wieczorek, Jacek Osek
A total of 57 out of 301 (18.9%) fresh and smoked fish samples in Poland were positive for Listeria monocytotgenes. The bacteria were most frequently identified in fresh and smoked salmon (32.0% and 33.8% respectively) as well as in fresh cod (31.8%). Only three samples of smoked salmon were contaminated with the bacteria above 100 CFU/g. Four molecular serogroups were identified and the most prevalent, 1/2a-3a (40 isolates; 70.2%), was present in samples from both marine (33 strains; 71.7%) and freshwater fish (7 isolates; 63...
June 2017: Food Microbiology
https://www.readbyqxmd.com/read/28213019/growth-interactions-and-antilisterial-effects-of-the-bacteriocinogenic-lactococcus-lactis-subsp-cremoris-m104-and-enterococcus-faecium-ke82-strains-in-thermized-milk-in-the-presence-or-absence-of-a-commercial-starter-culture
#8
Alexandra Lianou, Athanasia Kakouri, Eleni C Pappa, John Samelis
Traditional Greek cheeses are often produced from thermized milk (TM) with the use of commercial starter cultures (CSCs), which may not inhibit growth of Listeria monocytogenes completely. Therefore, this study evaluated the behavior of an artificial L. monocytogenes contamination in commercially TM (63 °C; 30 s) inoculated with a CSC plus Lactococcus lactis subsp. lactis M104 and/or Enterococcus faecium KE82, two indigenous strains producing nisin A and enterocin A and B, respectively. Inoculation treatments included TM with the CSC only, and TM without the CSC but with strain M104 alone, or combined with strain KE82...
June 2017: Food Microbiology
https://www.readbyqxmd.com/read/28213018/pathogen-biofilm-formation-on-cantaloupe-surface-and-its-impact-on-the-antibacterial-effect-of-lauroyl-arginate-ethyl
#9
Yezhi Fu, Amanda J Deering, Arun K Bhunia, Yuan Yao
Pathogen biofilm at fruit surface may pose a particular risk to food safety. In this study, the biofilms of Listeria monocytogenes V7 and Salmonella enterica serovar Typhimurium ATCC 13311 on cantaloupe fruit surface were visualized, and the resistance of biofilms against lauroyl arginate ethyl (LAE, an antibacterial compound) was evaluated. Each bacterium was inoculated on isolated cantaloupe rind surfaces at 10(5)-10(6) CFU/cm(2) and after incubation for 2, 12, 24, and 48 h, the surfaces were imaged using cryo-scanning electron microscopy (Cryo-SEM)...
June 2017: Food Microbiology
https://www.readbyqxmd.com/read/28213017/inactivation-of-salmonella-spp-pathogenic-escherichia-coli-staphylococcus-spp-or-listeria-monocytogenes-in-chicken-purge-or-skin-using-a-405-nm-led-array
#10
Christopher Sommers, Nereus W Gunther, Shiowshuh Sheen
Raw poultry are sometimes contaminated with foodborne pathogens, which can lead to illness in humans. In recent years research has focused on a variety of light technologies to decontaminate food and food contact surfaces during meat and poultry processing. In this study we evaluated the ability of 405-nm light generated from an LED array to inactivate multi-isolate cocktails of either Salmonella spp., pathogenic Escherichia coli, Staphylococcus spp., or Listeria monocytogenes suspended in chicken purge or skin...
June 2017: Food Microbiology
https://www.readbyqxmd.com/read/28210244/assessment-of-the-antimicrobial-activity-of-olive-leaf-extract-against-foodborne-bacterial-pathogens
#11
Yanhong Liu, Lindsay C McKeever, Nasir S A Malik
Olive leaf extract (OLE) has been used traditionally as a herbal supplement since it contains polyphenolic compounds with beneficial properties ranging from increasing energy levels, lowering blood pressure, and supporting the cardiovascular and immune systems. In addition to the beneficial effects on human health, OLE also has antimicrobial properties. The aim of this work was to investigate the antimicrobial effect of OLE against major foodborne pathogens, including Listeria monocytogenes, Escherichia coli O157:H7, and Salmonella Enteritidis...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28207901/yope-specific-cd8-t-cells-provide-protection-against-systemic-and-mucosal-yersinia-pseudotuberculosis-infection
#12
Norberto González-Juarbe, Haiqian Shen, Molly A Bergman, Carlos J Orihuela, Peter H Dube
Prior studies indicated that CD8+ T cells responding to a surrogate single antigen expressed by Y. pseudotuberculosis, ovalbumin, were insufficient to protect against yersiniosis. Herein we tested the hypothesis that CD8+ T cells reactive to the natural Yersinia antigen YopE would be more effective at providing mucosal protection. We first confirmed that immunization with the attenuated ksgA- strain of Y. pseudotuberculosis generated YopE-specific CD8+ T cells. These T cells were protective against challenge with virulent Listeria monocytogenes expressing secreted YopE...
2017: PloS One
https://www.readbyqxmd.com/read/28207308/prevalence-of-listeria-monocytogenes-in-retail-lightly-pickled-vegetables-and-its-successful-control-at-processing-plants
#13
Masumi Taguchi, Masashi Kanki, Yuko Yamaguchi, Hideichi Inamura, Yosuke Koganei, Tetsuya Sano, Hiromi Nakamura, Hiroshi Asakura
Incidences of food poisoning traced to nonanimal food products have been increasingly reported. One of these was a recent large outbreak of Shiga toxin-producing Escherichia coli (STEC) O157 infection from the consumption of lightly pickled vegetables, indicating the necessity of imposing hygienic controls during manufacturing. However, little is known about the bacterial contamination levels in these minimally processed vegetables. Here we examined the prevalence of STEC, Salmonella spp., and Listeria monocytogenes in 100 lightly pickled vegetable products manufactured at 55 processing factories...
February 16, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28207303/growth-of-listeria-monocytogenes-in-thawed-frozen-foods
#14
Ai Kataoka, Hua Wang, Philip H Elliott, Richard C Whiting, Melinda M Hayman
The growth characteristics of Listeria monocytogenes inoculated onto frozen foods (corn, green peas, crabmeat, and shrimp) and thawed by being stored at 4, 8, 12, and 20°C were investigated. The growth parameters, lag-phase duration (LPD) and exponential growth rate (EGR), were determined by using a two-phase linear growth model as a primary model and a square root model for EGR and a quadratic model for LPD as secondary models, based on the growth data. The EGR model predictions were compared with growth rates obtained from the USDA Pathogen Modeling Program, calculated with similar pH, salt percentage, and NaNO2 parameters, at all storage temperatures...
February 16, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28206760/nano-engineered-eggshell-silver-tailored-co-polyester-polymer-blend-film-with-antimicrobial-properties
#15
Boniface J Tiimob, Gregory Mwinyelle, Woubit Abdela, Temesgen Samuel, Shaik Jeelani, Vijaya K Rangari
In this study, the reinforcement effect of different proportions of eggshell/silver nanomaterial (ES-Ag) on structural and antimicrobial properties of 70/30 poly (butylene-co-adipate terephthalate)/polylactic acid (PBAT/PLA) immiscible blends were investigated. The ES-Ag was synthesized using a single step ball milling process, and characterized with X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). These results confirmed the existence of silver nanoparticles (Ag NPs) in the interstitial spaces of the eggshell particles...
February 16, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28205579/tim-3-inhibits-macrophage-control-of-listeria-monocytogenes-by-inhibiting-nrf2
#16
Zhiding Wang, Dejun Sun, Guojiang Chen, Ge Li, Shuaijie Dou, Renxi Wang, He Xiao, Chunmei Hou, Yan Li, Jiannan Feng, Beifen Shen, Gencheng Han
T cell immunoglobulin mucin-3 (Tim-3) is an immune checkpoint inhibitor and its dysregulation has been related to T cell tolerance and many immune disorders, such as tumors and infection tolerance. However, the physiopathology roles of Tim-3 in innate immunity remain elusive. Here, we demonstrate that Tim-3 inhibits macrophage phagocytosis of L. monocytogenes by inhibiting the nuclear erythroid 2-related factor 2 (Nrf2) signaling pathway and increases bacterial burden. Tim-3 signaling promotes Nrf2 degradation by increasing its ubiquitination and, as a result, decreasing its nuclear translocation...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28203122/evaluation-of-the-effect-of-radiofrequency-radiation-emitted-from-wi-fi-router-and-mobile-phone-simulator-on-the-antibacterial-susceptibility-of-pathogenic-bacteria-listeria-monocytogenes-and-escherichia-coli
#17
M Taheri, S M J Mortazavi, M Moradi, S Mansouri, G R Hatam, F Nouri
Mobile phones and Wi-Fi radiofrequency radiation are among the main sources of the exposure of the general population to radiofrequency electromagnetic fields (RF-EMF). Previous studies have shown that exposure of microorganisms to RF-EMFs can be associated with a wide spectrum of changes ranged from the modified bacterial growth to the alterations of the pattern of antibiotic resistance. Our laboratory at the nonionizing department of the Ionizing and Non-ionizing Radiation Protection Research Center has performed experiments on the health effects of exposure to animal models and humans to different sources of electromagnetic fields such as cellular phones, mobile base stations, mobile phone jammers, laptop computers, radars, dentistry cavitrons, magnetic resonance imaging, and Helmholtz coils...
January 2017: Dose-response: a Publication of International Hormesis Society
https://www.readbyqxmd.com/read/28202229/requirement-of-the-rna-binding-protein-smpb-during-intracellular-growth-of-listeria-monocytogenes
#18
Mobarak Abu Mraheil, Renate Frantz, Lisa Teubner, Heiko Wendt, Uwe Linne, Jessica Wingerath, Thomas Wirth, Trinad Chakraborty
Bacterial trans-translation is the main quality control mechanism employed to relieve stalled ribosomes. Trans-translation is mediated by the small protein B (SmpB) and transfer-mRNA (tmRNA) ribonucleoprotein complex, which interacts with translational complexes stalled at the 3' end of non-stop mRNAs to release the stalled ribosomes thereby targeting the nascent polypeptides and truncated mRNAs for degradation. The trans-translation system exists with a few exceptions in all bacteria. In the present study, we assessed the contribution of SmpB to the growth and virulence of Listeria monocytogenes, a human intracellular food-borne pathogen that colonizes host tissues to cause severe invasive infections...
February 1, 2017: International Journal of Medical Microbiology: IJMM
https://www.readbyqxmd.com/read/28202007/diffusible-substances-from-lactic-acid-bacterial-cultures-exert-strong-inhibitory-effects-on-listeria-monocytogenes-and-salmonella-enterica-serovar-enteritidis-in-a-co-culture-model
#19
Solomon H Mariam, Nigus Zegeye, Abraham Aseffa, Rawleigh Howe
BACKGROUND: Food-borne infections cause huge economic and human life losses. Listeria monocytogenes and Salmonella enterica serovar Enteritidis are among the top ranking pathogens causing such losses. Control of such infections is hampered by persistent contamination of foods and food-processing environments, resistance of pathogens to sanitizing agents, existence of heterogeneous populations of pathogens (including culturable and viable but non-culturable cells) within the same food items, and inability to detect all such pathogens by culture-based methods...
February 15, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28199146/morphological-change-and-decreasing-transfer-rate-of-biofilm-featured-listeria-monocytogenes-egde
#20
Yuejia Lee, Chinling Wang
Listeria monocytogenes , a lethal foodborne pathogen, has the ability to resist the hostile food processing environment and thus frequently contaminates ready-to-eat foods during processing. It is commonly accepted that the tendency of L. monocytogenes ' to generate biofilms on various surfaces enhances its resistance to the harshness of the food processing environment. However, the role of biofilm formation in the transferability of L. monocytogenes EGDe remains controversial. We examined the growth of Listeria biofilms on stainless steel surfaces and their effect on the transferability of L...
February 15, 2017: Journal of Food Protection
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