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https://www.readbyqxmd.com/read/28805458/thermal-inactivation-of-listeria-monocytogenes-and-salmonella-during-water-and-steam-blanching-of-vegetables
#1
Erdogan Ceylan, Wendy McMahon, Donna M Garren
Thermal inactivation of Listeria monocytogenes and Salmonella was evaluated on peas, spinach, broccoli, potatoes, and carrots that were treated with hot water and steam. One gram-positive bacterium, L. monocytogenes, and one gram-negative bacterium, Salmonella, were selected as pertinent human pathogens for evaluation. Samples were inoculated with a composite of five strains each of L. monocytogenes and Salmonella to achieve approximately 10(8) to 10(9) CFU/g. Inoculated samples were treated with hot water at 85 and 87...
August 14, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28805457/selection-of-surrogate-bacteria-for-use-in-food-safety-challenge-studies-a-review
#2
Mengyi Hu, Joshua B Gurtler
Nonpathogenic surrogate bacteria are prevalently used in a variety of food challenge studies in place of foodborne pathogens such as Listeria monocytogenes, Salmonella, Escherichia coli O157:H7, and Clostridium botulinum because of safety and sanitary concerns. Surrogate bacteria should have growth characteristics and/or inactivation kinetics similar to those of target pathogens under given conditions in challenge studies. It is of great importance to carefully select and validate potential surrogate bacteria when verifying microbial inactivation processes...
August 14, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28805153/investigating-the-susceptibility-of-mice-to-a-bacterial-challenge-after-intravenous-exposure-to-durable-nanoparticles
#3
Saeed Khan, Qin Zhang, Bernard S Marasa, Kidon Sung, Carl E Cerniglia, Taylor Ingle, Margie Yvonne Jones, Angel M Paredes, Grainne A Tobin, Simona Bancos, James L Weaver, Peter L Goering, Paul C Howard, Anil K Patri, Katherine M Tyner
AIM: The goal of this study was to determine whether bacterial clearance in a rodent model would be impaired upon exposure to gold, silver or silica nanoparticles (NPs). MATERIALS & METHODS: Mice received weekly injections of NPs followed by a challenge of Listeria monocytogenes (LM). On days 3 and 10 after LM injections, the animals were sacrificed and their tissues were collected for elemental analysis, electron microscopy and LM count determination. RESULTS: The untreated and NP-treated animals cleared LM at the same rate suggesting that bioaccumulation of NPs did not increase the animals' susceptibility to bacterial infection...
August 14, 2017: Nanomedicine
https://www.readbyqxmd.com/read/28803862/recombinant-lcmv-vectors-induce-protective-immunity-following-homologous-and-heterologous-vaccinations
#4
Jessica Wingerath, Dmitrij Ostroumov, Norman Woller, Michael P Manns, Daniel D Pinschewer, Klaus Orlinger, Ursula Berka, Florian Kühnel, Thomas C Wirth
Successful vaccination against cancer and infectious diseases relies on the induction of adaptive immune responses that induce high-titer antibodies or potent cytoxic T cell responses. In contrast to humoral vaccines, the amplification of cellular immune responses is often hampered by anti-vector immunity that either pre-exists or develops after repeated homologous vaccination. Replication-defective lymphocytic choriomeningitis virus (LCMV) vectors represent a novel generation of vaccination vectors that induce potent immune responses while escaping recognition by neutralizing antibodies...
July 20, 2017: Molecular Therapy: the Journal of the American Society of Gene Therapy
https://www.readbyqxmd.com/read/28803189/efficacy-of-radiant-catalytic-ionization-to-reduce-bacterial-populations-in-air-and-on-different-surfaces
#5
Krzysztof Skowron, Katarzyna Grudlewska, Joanna Kwiecińska-Piróg, Grzegorz Gryń, Mścisław Śrutek, Eugenia Gospodarek-Komkowska
Air contamination by biological agents is often observed in medical or veterinary facilities and industrial plants. Bioaerosols may sediment and pose the surface contamination. Microorganisms present on them may become a source of infections among humans and food contamination. This study determined the use of oxidative gases, including ozone and peroxide, generated by the Radiant Catalytic Ionization (RCI) cell for the inactivation of Acinetobacter baumannii, Escherichia coli, Enterococcus faecalis, Pseudomonas aeruginosa, Salmonella Enteritidis, Listeria monocytogenes, Staphylococcus aureus, Streptococcus epidermidis, Bacillus subtilis, Clostridium sporogenes, Candida albicans, Aspergillus niger and Penicillium chrysogenumon in air and on different surfaces...
August 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28803156/sequential-transition-of-the-injury-phenotype-temperature-dependent-survival-and-transcriptional-response-in-listeria-monocytogenes-following-lethal-h2o2-exposure
#6
Yoshitsugu Ochiai, Fumiya Yamada, Yuko Yoshikawa, Mariko Mochizuki, Takashi Takano, Ryo Hondo, Fukiko Ueda
The food-borne pathogen Listeria monocytogenes is present persistently in food processing environments, where this bacterium is exposed to various stress factors, including oxidative stress. This study aimed to elucidate the temperature-dependent response of L. monocytogenes to H2O2 exposure and the phenotypic changes in colony formation by H2O2-treated bacteria. Survival curves indicated an increase in the resistance to H2O2 in L. monocytogenes as the temperature decreased during the stress exposure procedure...
August 3, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28803013/short-communication-detection-of-stx2-and-elt-genes-in-bovine-milk-by-using-a-multiplex-pcr-system
#7
R D S Nandi, A C Campos, J J Puño-Sarmiento, R P Maluta, S P D Rocha, R K T Kobayashi, G Nakazato
The aim of this study was to detect 2 important toxin genes from diarrheagenic Escherichia coli (DEC) in bovine milk using a new multiplex PCR. To standardize the multiplex PCR, the stx2 and elt genes were investigated for the detection of Shiga toxin-producing Escherichia coli (STEC) and enterotoxigenic E. coli (ETEC), respectively. The DNA template was prepared with a thermal procedure (boiling) and a commercial kit. Samples consisted of UHT and pasteurized milk, both skimmed, and STEC and ETEC were tested in concentrations between 10(1) and 10(9) cfu/mL...
August 9, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28803008/two-step-large-volume-magnetic-separation-combined-with-pcr-assay-for-sensitive-detection-of-listeria-monocytogenes-in-pasteurized-milk
#8
Dan Luo, Xiaolin Huang, Yan Mao, Chaochao Chen, Fulai Li, Hengyi Xu, Yonghua Xiong
Immunomagnetic separation (IMS) is an effective tool for the preconcentration and purification of food-borne pathogens from complex food samples because of its high capture efficiency (CE). In conventional IMS, antibodies are usually conjugated on the surface of magnetic beads (MB); the random orientation and conformation changes of antibodies on the MB surface can decrease their bioactivity. Moreover, the Brownian motion of immobilized antibodies is weakened, thereby rendering their binding efficiency with bacteria lower than that of free antibodies...
August 9, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28802271/antibiofilm-effect-of-poly-vinyl-alcohol-co-ethylene-pva-co-pe-halamine-film-against-listeria-innocua-and-escherichia-coli-o157-h7
#9
Andrea Cossu, Yang Si, Gang Sun, Nitin Nitin
Bacterial biofilm formation is linked to several infections and foodborne disease outbreaks. To address this challenge, there is an unmet need to develop rechargeable antimicrobial materials that can provide continuous sanitation of contact surfaces especially in the food industry. This study was aimed at evaluating a novel rechargeable antimicrobial polymer formed using PVA-co-PE with halamine functionality to prevent biofilm formation with repeated exposure to high loads of bacteria and organic content and also aid in inactivation of pre-formed biofilms upon contact with this novel material...
August 11, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28802046/replication-transcription-conflicts-generate-r-loops-that-orchestrate-bacterial-stress-survival-and-pathogenesis
#10
Kevin S Lang, Ashley N Hall, Christopher N Merrikh, Mark Ragheb, Hannah Tabakh, Alex J Pollock, Joshua J Woodward, Julia E Dreifus, Houra Merrikh
Replication-transcription collisions shape genomes, influence evolution, and promote genetic diseases. Although unclear why, head-on transcription (lagging strand genes) is especially disruptive to replication and promotes genomic instability. Here, we find that head-on collisions promote R-loop formation in Bacillus subtilis. We show that pervasive R-loop formation at head-on collision regions completely blocks replication, elevates mutagenesis, and inhibits gene expression. Accordingly, the activity of the R-loop processing enzyme RNase HIII at collision regions is crucial for stress survival in B...
August 10, 2017: Cell
https://www.readbyqxmd.com/read/28800831/characterization-of-enterococcus-durans-152-bacteriocins-and-their-inhibition-of-listeria-monocytogenes-in-ham
#11
Lihui Du, Fang Liu, Ping Zhao, Tong Zhao, Michael P Doyle
Listeria monocytogenes is a nonfastidious, widely occurring foodborne pathogen that is a major challenge to the food industry. Enterococcus durans 152, a confirmed L. monocytogenes-control microorganism, was isolated from floor drain samples from a food processing facility. In this study, the two bacteriocins produced by E. durans 152 were characterized and identified as Dur 152A (an enterocin L50A derivative with two amino acid substitutions of I→M) and enterocin L50B. The bacteriocins were then partially purified and evaluated for inhibitory activity to L...
December 2017: Food Microbiology
https://www.readbyqxmd.com/read/28800830/modeling-carbon-dioxide-effect-in-a-controlled-atmosphere-and-its-interactions-with-temperature-and-ph-on-the-growth-of-l-%C3%A2-monocytogenes-and-p-%C3%A2-fluorescens
#12
Olivier Couvert, Stéphanie Guégan, Bernard Hézard, Véronique Huchet, Adrienne Lintz, Dominique Thuault, Valérie Stahl
The effect of carbon dioxide, temperature, and pH on growth of Listeria monocytogenes and Pseudomonas fluorescens was studied, following a protocol to monitor microbial growth under a constant gas composition. In this way, the CO2 dissolution didn't modify the partial pressures in the gas phase. Growth curves were acquired at different temperatures (8, 12, 22 and 37 °C), pH (5.5 and 7) and CO2 concentration in the gas phase (0, 20, 40, 60, 80, 100% of the atmospheric pressure, and over 1 bar). These three factors greatly influenced the growth rate of L...
December 2017: Food Microbiology
https://www.readbyqxmd.com/read/28800829/combination-of-endolysins-and-high-pressure-to-inactivate-listeria-monocytogenes
#13
Tomas J van Nassau, Christian A Lenz, Anna S Scherzinger, Rudi F Vogel
Outbreaks of listeriosis are often related to the consumption of low-processed ready-to-eat food products (e.g. soft cheeses or smoked fish) contaminated with Listeria monocytogenes. Traditional preservation techniques, such as heat treatment, cannot eliminate Listeria from these products without strongly affecting the quality of the foods. We therefore investigated the use of endolysin (PlyP40, Ply511, or PlyP825) in combination with high hydrostatic pressure processing to kill L. monocytogenes in buffer...
December 2017: Food Microbiology
https://www.readbyqxmd.com/read/28800821/listeria-monocytogenes-incidence-changes-and-diversity-in-some-brazilian-dairy-industries-and-retail-products
#14
Virginie Oxaran, Sarah Hwa In Lee, Luíza Toubas Chaul, Carlos Humberto Corassin, Giovana Verginia Barancelli, Virgínia Farias Alves, Carlos Augusto Fernandes de Oliveira, Lone Gram, Elaine Cristina Pereira De Martinis
Listeria monocytogenes can cause listeriosis, a severe foodborne disease. In Brazil, despite very few reported cases of listeriosis, the pathogen has been repeatedly isolated from dairies. This has led the government to implement specific legislation to reduce the hazard. Here, we determined the incidence of L. monocytogenes in five dairies and retail products in the Southeast and Midwest regions of Brazil over eight months. Of 437 samples, three samples (0.7%) from retail and only one sample (0.2%) from the dairies were positive for L...
December 2017: Food Microbiology
https://www.readbyqxmd.com/read/28799082/mathematical-model-of-interaction-between-bacteriocin-producing-lactic-acid-bacteria-and-listeria-part-2-bifurcations-and-applications
#15
Roberta Regina Delboni, Hyun Mo Yang
The big challenge for the food industry is the attending to demands for minimally processed foods, avoiding intense heat treatments and reducing the addition of chemical preservatives, but at the same time ensuring microbiological safety of these products. Lactic acid bacteria are traditionally used in the production of fermented foods. They are responsible for the production of antimicrobial compounds, such as organic acids and bacteriocins, which are protein compounds with bactericidal effect against related species and bacteria such as Listeria monocytogenes and Staphylococcus aureus...
August 10, 2017: Bulletin of Mathematical Biology
https://www.readbyqxmd.com/read/28798957/holographic-deep-learning-for-rapid-optical-screening-of-anthrax-spores
#16
YoungJu Jo, Sangjin Park, JaeHwang Jung, Jonghee Yoon, Hosung Joo, Min-Hyeok Kim, Suk-Jo Kang, Myung Chul Choi, Sang Yup Lee, YongKeun Park
Establishing early warning systems for anthrax attacks is crucial in biodefense. Despite numerous studies for decades, the limited sensitivity of conventional biochemical methods essentially requires preprocessing steps and thus has limitations to be used in realistic settings of biological warfare. We present an optical method for rapid and label-free screening of Bacillus anthracis spores through the synergistic application of holographic microscopy and deep learning. A deep convolutional neural network is designed to classify holographic images of unlabeled living cells...
August 2017: Science Advances
https://www.readbyqxmd.com/read/28795907/synergy-of-a-combination-of-nisin-and-citric-acid-against-staphylococcus-aureus-and-listeria-monocytogenes
#17
Xingchen Zhao, Zhen Zhen, Xinyang Wang, Na Guo
Food-borne diseases caused by pathogens, such as Staphylococcus aureus and Listeria monocytogenes, have for a long time attracted intensive worldwide attention from scientific researchers, food industries, and food safety authorities. Nisin (NS) is the only bacteriocin used worldwide as a GRAS food preservative, while citric acid (CA) has an unrestricted use in foods since it has GRAS status. In this study, synergistic interactions of NS combined with CA against S. aureus and L. monocytogenes were studied by the checkerboard microdilution method, with fractional inhibitory concentration index values ranging from 0...
August 10, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28792179/listeria-in-adults-truly-rare-or-rarely-diagnosed-in-india
#18
Arjun Rajalakshmi, Ram Gopalakrishnan, P Senthur Nambi, P Vishnu Rao, V Ramasubramanian
Listeria monocytogenes is a facultative anaerobic intracellular Gram positive rod causing infection in pregnant women, extremes of age and immune-compromised hosts. In clinical specimens, the organisms may be gram-variable: laboratory misidentification of L. monocytogenes isolates as diphtheroids, streptococci, or enterococci is not uncommon and the isolation of a diphtheroid from blood or CSF should always alert the clinician to the possibility that the organism may be L. monocytogenes. The disease has rarely been reported in India in non-pregnant adults...
July 2017: Journal of the Association of Physicians of India
https://www.readbyqxmd.com/read/28790993/fate-of-listeria-monocytogenes-on-fresh-apples-under-different-storage-temperatures
#19
Lina Sheng, Katheryn Edwards, Hsieh-Chin Tsai, Ines Hanrahan, Mei-Jun Zhu
Fresh apples are typically stored for up to 1 year commercially; different apple varieties require different storage temperatures to maintain their quality characteristics. There is sparse information available about Listeria monocytogenes survival on fresh apples under various storage temperatures. The objective of this study was to comprehensively evaluate the effect of storage temperature on apple fruit decay and L. monocytogenes survival. Unwaxed apple fruits of selected varieties (Fuji and Granny Smith) were dip inoculated in a three-strain L...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28790979/modeling-the-combined-effect-of-pressure-and-mild-heat-on-the-inactivation-kinetics-of-escherichia-coli-listeria-innocua-and-staphylococcus-aureus-in-black-tiger-shrimp-penaeus-monodon
#20
Barjinder P Kaur, P Srinivasa Rao
The high-pressure inactivation of Escherichia coli, Listeria innocua, and Staphylococcus aureus was studied in black tiger shrimp (Penaeus monodon). The processing parameters examined included pressure (300 to 600 MPa) and temperature (30 to 50°C). In addition, the pressure-hold period (0 to 15 min) was investigated, thus allowing both single-pulse pressure effects (i.e., zero holding time) and pressure-hold effects to be explored. E. coli was found to be the most sensitive strain to single-pulse pressure, followed by L...
2017: Frontiers in Microbiology
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