Listeria Monocytogenes
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Annual Conference Abstracts
ANNUAL CONFERENCE 14-17 April 2014 Arena and Convention Centre, Liverpool ABSTRACTS SGM ANNUAL CONFERENCE APRIL 2014 ABSTRACTS (LI00Mo1210) – SGM Prize Medal Lecture (LI00Tu1210) – Marjory Stephenson Climate Change, Oceans, and Infectious Disease Prize Lecture Dr. Rita R. Colwell Understanding the basis of antibiotic resistance University of Maryland, College Park, MD, USA as a platform for early drug discovery During the mid-1980s, satellite sensors were developed to monitor Laura JV Piddock land and oceans for purposes of understanding climate, weather, School of Immunity & Infection and Institute of Microbiology and and vegetation distribution and seasonal variations. Subsequently Infection, University of Birmingham, UK inter-relationships of the environment and infectious diseases Antibiotic resistant bacteria are one of the greatest threats to human were investigated, both qualitatively and quantitatively, with health. Resistance can be mediated by numerous mechanisms documentation of the seasonality of diseases, notably malaria including mutations conferring changes to the genes encoding the and cholera by epidemiologists. The new research revealed a very target proteins as well as RND efflux pumps, which confer innate close interaction of the environment and many other infectious multi-drug resistance (MDR) to bacteria. The production of efflux diseases. With satellite sensors, these relationships were pumps can be increased, usually due to mutations in regulatory quantified and comparatively analyzed. More recent studies of genes, and this confers resistance to antibiotics that are often used epidemic diseases have provided models, both retrospective and to treat infections by Gram negative bacteria. RND MDR efflux prospective, for understanding and predicting disease epidemics, systems not only confer antibiotic resistance, but altered expression notably vector borne diseases. -
Female Fellows of the Royal Society
Female Fellows of the Royal Society Professor Jan Anderson FRS [1996] Professor Ruth Lynden-Bell FRS [2006] Professor Judith Armitage FRS [2013] Dr Mary Lyon FRS [1973] Professor Frances Ashcroft FMedSci FRS [1999] Professor Georgina Mace CBE FRS [2002] Professor Gillian Bates FMedSci FRS [2007] Professor Trudy Mackay FRS [2006] Professor Jean Beggs CBE FRS [1998] Professor Enid MacRobbie FRS [1991] Dame Jocelyn Bell Burnell DBE FRS [2003] Dr Philippa Marrack FMedSci FRS [1997] Dame Valerie Beral DBE FMedSci FRS [2006] Professor Dusa McDuff FRS [1994] Dr Mariann Bienz FMedSci FRS [2003] Professor Angela McLean FRS [2009] Professor Elizabeth Blackburn AC FRS [1992] Professor Anne Mills FMedSci FRS [2013] Professor Andrea Brand FMedSci FRS [2010] Professor Brenda Milner CC FRS [1979] Professor Eleanor Burbidge FRS [1964] Dr Anne O'Garra FMedSci FRS [2008] Professor Eleanor Campbell FRS [2010] Dame Bridget Ogilvie AC DBE FMedSci FRS [2003] Professor Doreen Cantrell FMedSci FRS [2011] Baroness Onora O'Neill * CBE FBA FMedSci FRS [2007] Professor Lorna Casselton CBE FRS [1999] Dame Linda Partridge DBE FMedSci FRS [1996] Professor Deborah Charlesworth FRS [2005] Dr Barbara Pearse FRS [1988] Professor Jennifer Clack FRS [2009] Professor Fiona Powrie FRS [2011] Professor Nicola Clayton FRS [2010] Professor Susan Rees FRS [2002] Professor Suzanne Cory AC FRS [1992] Professor Daniela Rhodes FRS [2007] Dame Kay Davies DBE FMedSci FRS [2003] Professor Elizabeth Robertson FRS [2003] Professor Caroline Dean OBE FRS [2004] Dame Carol Robinson DBE FMedSci -
Inhibitory Activity of Lactobacillus Plantarum LMG P-26358 Against
Mills et al. Microbial Cell Factories 2011, 10(Suppl 1):S7 http://www.microbialcellfactories.com/content/10/S1/S7 PROCEEDINGS Open Access Inhibitory activity of Lactobacillus plantarum LMG P-26358 against Listeria innocua when used as an adjunct starter in the manufacture of cheese Susan Mills1,3, L Mariela Serrano3, Carmel Griffin1,3, Paula M O’Connor1, Gwenda Schaad3, Chris Bruining3, Colin Hill2,4, R Paul Ross1,2*, Wilco C Meijer3 From 10th Symposium on Lactic Acid Bacterium Egmond aan Zee, the Netherlands. 28 August - 1 September 2011 Abstract Lactobacillus plantarum LMG P-26358 isolated from a soft French artisanal cheese produces a potent class IIa bacteriocin with 100% homology to plantaricin 423 and bacteriocidal activity against Listeria innocua and Listeria monocytogenes. The bacteriocin was found to be highly stable at temperatures as high as 100°C and pH ranges from 1-10. While this relatively narrow spectrum bacteriocin also exhibited antimicrobial activity against species of enterococci, it did not inhibit dairy starters including lactococci and lactobacilli when tested by well diffusion assay (WDA). In order to test the suitability of Lb. plantarum LMG P-26358 as an anti-listerial adjunct with nisin-producing lactococci, laboratory-scale cheeses were manufactured. Results indicated that combining Lb. plantarum LMG P- 26358 (at 108 colony forming units (cfu)/ml) with a nisin producer is an effective strategy to eliminate the biological indicator strain, L. innocua. Moreover, industrial-scale cheeses also demonstrated that Lb. plantarum LMG P-26358 was much more effective than the nisin producer alone for protection against the indicator. MALDI-TOF mass spectrometry confirmed the presence of plantaricin 423 and nisin in the appropriate cheeses over an 18 week ripening period. -
Sanitation Assessment of Food Contact Surfaces and Lethality Of
University of Arkansas, Fayetteville ScholarWorks@UARK Theses and Dissertations 5-2012 Sanitation Assessment of Food Contact Surfaces and Lethality of Moist Heat and a Disinfectant Against Listeria Strains Inoculated on Deli Slicer Components Sabelo Muzikayise Masuku University of Arkansas, Fayetteville Follow this and additional works at: http://scholarworks.uark.edu/etd Part of the Food Microbiology Commons Recommended Citation Masuku, Sabelo Muzikayise, "Sanitation Assessment of Food Contact Surfaces and Lethality of Moist Heat and a Disinfectant Against Listeria Strains Inoculated on Deli Slicer Components" (2012). Theses and Dissertations. 355. http://scholarworks.uark.edu/etd/355 This Thesis is brought to you for free and open access by ScholarWorks@UARK. It has been accepted for inclusion in Theses and Dissertations by an authorized administrator of ScholarWorks@UARK. For more information, please contact [email protected], [email protected]. SANITATION ASSESSMENT OF FOOD CONTACT SURFACES AND LETHALITY OF MOIST HEAT AND A DISINFECTANT AGAINST LISTERIA STRAINS INOCULATED ON DELI SLICER COMPONENTS SANITATION ASSESSMENT OF FOOD CONTACT SURFACES AND LETHALITY OF MOIST HEAT AND A DISINFECTANT AGAINST LISTERIA STRAINS INOCULATED ON DELI SLICER COMPONENTS A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Food Science By Sabelo Muzikayise Masuku Tshwane University of Technology Bachelor of Technology in Environmental Health, 2000 Curtin University Master of Public Health, 2005 May 2012 University of Arkansas ABSTRACT The overall objectives of this study were to: evaluate the efficacy of different cleaning cloth types and cloth-disinfectant combinations in reducing food contact surface contamination to acceptable levels; determine the optimum moist heat and moist heat + sanitizer treatments that can significantly reduce the number of Listeria strains on deli slicer components; and investigate if the moist heat treatment used in this study induced the viable-but-non-culturable (VBNC) state in Listeria cells. -
Reducing Listeria Contamination from Salad Vegetable Farms
Reducing Listeria contamination from salad vegetable farms Robert Premier Global FS Pty Ltd Project Number: VG07079 VG07079 This report is published by Horticulture Australia Ltd to pass on information concerning horticultural research and development undertaken for the vegetables industry. The research contained in this report was funded by Horticulture Australia Ltd with the financial support of the vegetables industry. All expressions of opinion are not to be regarded as expressing the opinion of Horticulture Australia Ltd or any authority of the Australian Government. The Company and the Australian Government accept no responsibility for any of the opinions or the accuracy of the information contained in this report and readers should rely upon their own enquiries in making decisions concerning their own interests. ISBN 0 7341 2463 5 Published and distributed by: Horticulture Australia Ltd Level 7 179 Elizabeth Street Sydney NSW 2000 Telephone: (02) 8295 2300 Fax: (02) 8295 2399 © Copyright 2010 Reducing Listeria monocytogenes contamination from salad vegetable farms VG07079 Final report for HAL project (July 2010) Robert Premier Global F.S. Pty Ltd Reducing Listeria monocytogenes contamination from salad vegetable farms Final report for HAL project VG07079 By: Robert Premier Project Leader Dr Robert Premier Global F.S. pty ltd Ph: 0418317786 Email: [email protected] Scope of the Report This report presents the key findings and a summary of the work conducted in Victoria and Queensland from September 2008 to June 2010 by the Project team. Funded By: Horticulture Australia Limited and the Australian vegetable industry levy. This publication may be of assistance to you but Global F.S. -
The Excludon: a New Concept in Bacterial Antisense RNA-Mediated
Nature Reviews Microbiology | AOP, published online 24 December 2013; doi:10.1038/nrmicro2934 PROGRESS this paradigm in the context of other, better characterized asRNA-mediated regulatory The excludon: a new concept in mechanisms. The excludon concept describes unusually long asRNAs that inhibit the bacterial antisense RNA-mediated expression of one group of genes while enhancing the expression of a second group gene regulation of genes. Thus, single transcripts have the ability to control divergent operons that often have opposing functions. Nina Sesto, Omri Wurtzel, Cristel Archambaud, Rotem Sorek and Pascale Cossart asRNAs in microbial transcriptomes Abstract | In recent years, non-coding RNAs have emerged as key regulators of gene asRNAs are encoded on one strand of the DNA and overlap a gene that is encoded on expression. Among these RNAs, the antisense RNAs (asRNAs) are particularly the opposite strand. Therefore, these cis- abundant, but in most cases the function and mechanism of action for a particular encoded asRNAs have perfect complementa‑ asRNA remains elusive. Here, we highlight a recently discovered paradigm termed rity to the sense transcript from the opposite the excludon, which defines a genomic locus encoding an unusually long asRNA that DNA strand. The regulatory role of asRNAs spans divergent genes or operons with related or opposing functions. Because these was first reported more than 30 years ago, in the case of plasmid- and transposon-encoded asRNAs can inhibit the expression of one operon while functioning as an mRNA for asRNAs in Escherichia coli, when the asRNAs the adjacent operon, they act as fine-tuning regulatory switches in bacteria. -
Production of Antibodies for Use in a Biosensor- Based Assay for Listeria Monocytogenes
Production of antibodies for use in a biosensor- based assay for Listeria monocytogenes A thesis submitted for the degree of Ph.D. By Paul Leonard B.Sc. (Hons), August 2003. Based on research carried out at School of Biotechnology, Dublin City University, D ublin 9, Ireland, Under the supervision of Professor Richard O’Kennedy. This thesis is dedicated to my parents for all their encouragement and support over the last number of years. “I am not discouraged, because every wrong attempt discarded is another step forward” -Thomas Edison. Declaration I hereby certify that this material, which 1 now submit for assessment on the programme of study leading to the award of Doctor of Philosophy, is entirely my own work, and has not been taken from the work of others, save and to the extent that such work is cited and acknowledged within the text. Signed Date: Acknowledgements Sincere thanks to Prof. Richard O'Kennedy for his constant support and guidance over the past few years, in particular for sharing his wealth of experience and knowledge throughout my studies. Thanks to all the lab group, past and present and all my friends at DC’U for their companionship and some unforgettable (and more often than not better forgotten) nights out! Special thanks goes to Steve, a great scientist and friend, for his support, knowledge and overall enthusiasm over the last few years. To Monty, Macker, Ryaner and the rest of the “Finian's lads” for their continual ‘good humoured harassment’ and alcohol-based support! Cheers! I would like to thank all my family for their unequivocal support from start to finish, I owe you so much! Finally, 1 would like to reserve a very special thanks to Nerea, my source of inspiration, for her patience, companionship and constant love and support. -
Cross-Resistance to Phage Infection in Listeria Monocytogenes Serotype 1/2A Mutants and Preliminary Analysis of Their Wall Teichoic Acids
University of Tennessee, Knoxville TRACE: Tennessee Research and Creative Exchange Masters Theses Graduate School 8-2019 Cross-resistance to Phage Infection in Listeria monocytogenes Serotype 1/2a Mutants and Preliminary Analysis of their Wall Teichoic Acids Danielle Marie Trudelle University of Tennessee, [email protected] Follow this and additional works at: https://trace.tennessee.edu/utk_gradthes Recommended Citation Trudelle, Danielle Marie, "Cross-resistance to Phage Infection in Listeria monocytogenes Serotype 1/2a Mutants and Preliminary Analysis of their Wall Teichoic Acids. " Master's Thesis, University of Tennessee, 2019. https://trace.tennessee.edu/utk_gradthes/5512 This Thesis is brought to you for free and open access by the Graduate School at TRACE: Tennessee Research and Creative Exchange. It has been accepted for inclusion in Masters Theses by an authorized administrator of TRACE: Tennessee Research and Creative Exchange. For more information, please contact [email protected]. To the Graduate Council: I am submitting herewith a thesis written by Danielle Marie Trudelle entitled "Cross-resistance to Phage Infection in Listeria monocytogenes Serotype 1/2a Mutants and Preliminary Analysis of their Wall Teichoic Acids." I have examined the final electronic copy of this thesis for form and content and recommend that it be accepted in partial fulfillment of the equirr ements for the degree of Master of Science, with a major in Food Science. Thomas G. Denes, Major Professor We have read this thesis and recommend its acceptance: -
Identification, Properties, and Application of Enterocins Produced by Enterococcal Isolates from Foods
IDENTIFICATION, PROPERTIES, AND APPLICATION OF ENTEROCINS PRODUCED BY ENTEROCOCCAL ISOLATES FROM FOODS THESIS Presented in Partial Fulfillment of the Requirement for the Degree Master of Science in the Graduate School of The Ohio State University By Xueying Zhang, B.S. ***** The Ohio State University 2008 Master Committee: Approved by Professor Ahmed E. Yousef, Advisor Professor Hua Wang __________________________ Professor Luis Rodriguez-Saona Advisor Food Science and Nutrition ABSTRACT Bacteriocins produced by lactic acid bacteria have gained great attention because they have potentials for use as natural preservatives to improve food safety and stability. The objectives of the present study were to (1) screen foods and food products for lactic acid bacteria with antimicrobial activity against Gram-positive bacteria, (2) investigate virulence factors and antibiotic resistance among bacteriocin-producing enterooccal isolates, (3) characterize the antimicrobial agents and their structural gene, and (4) explore the feasibility of using these bacteriocins as food preservatives. In search for food-grade bacteriocin-producing bacteria that are active against spoilage and pathogenic microorganisms, various commercial food products were screened and fifty-one promising Gram-positive isolates were studied. Among them, fourteen food isolates with antimicrobial activity against food-borne pathogenic bacteria, Listeria monocytogenes and Bacillus cereus, were chosen for further study. Based on 16S ribosomal RNA gene sequence analysis, fourteen food isolates were identified as Enterococcus faecalis, and these enterococcal isolates were investigated for the presence of virulence factors and antibiotic resistance through genotypic and phenotypic screening. Results indicated that isolates encoded some combination of virulence factors. The esp gene, encoding extracellular surface protein, was not detected in any of the isolates. -
From Telomeres to Empathy Highlights from the EMBO Meeting 2010 by CRISTINA JIMÉNEZ
AUTUMN 2010 encounters Newsletter of the European Molecular Biology Organization From telomeres to empathy Highlights from The EMBO Meeting 2010 BY CRISTINA JIMÉNEZ ◗ In the early 1980s, after a meeting at the Gordon Research Conference, Elizabeth Blackburn and Jack Szostak discovered that telo meres include a specifi c DNA sequence. 29 years on, the fortuitous encounter resulted in a Nobel Prize for discovering the structure Elizabeth Frans de Waal Blackburn of molecular caps called telomeres and for working out how they protect chromosomes from degradation. This is only one fi brillation, a condition in Richard example of how necessary meetings can be for the advancement of sci- which there is uncoordinated Losick ence. They provide a perfect setting for junior researchers to approach contraction of the cardiac prospective supervisors – and vice versa. They can lead to new part- muscle of the ventricles in the nerships between research groups working in similar fi elds. And they heart, making them quiver also inspire open discussion and collaboration between institutions. rather than contract properly. The EMBO Meeting, held in September in Barcelona, gathered more Haïssaguerre explained how than 1,300 researchers from a broad scope of disciplines, extending he is currently having great from synthetic, developmental and evolutionary biologists to plant success in curing hundreds of scientists and neuroscientists. “Postdocs and PhD students are the patients every year from this main benefi ciaries of these meetings,” pointed out Luis Serrano, who sort of arrhythmia. Austin co-organized the meeting with Denis Duboule. Smith, the other prize winner, | Barcelona © Christine Panagiotidis The meeting kicked off on Saturday 4 September with Richard Losick gave a lecture on stem cells and the Design principles of pluripotency. -
Thesis Listeria Monocytogenes and Other
THESIS LISTERIA MONOCYTOGENES AND OTHER LISTERIA SPECIES IN SMALL AND VERY SMALL READY-TO-EAT MEAT PROCESSING PLANTS Submitted by Shanna K. Williams Department of Animal Sciences In partial fulfillment of the requirements for the degree of Master of Science Colorado State University Fort Collins, Colorado Fall 2010 Master’s Committee: Department Chair: William Wailes Advisor: Kendra Nightingale John N. Sofos Doreene Hyatt ABSTRACT OF THESIS DETECTION AND MOLECULAR CHARACTERIZATION OF LISTERIA MONOCYTOGENES AND OTHER LISTERIA SPECIES IN THE PROCESSING PLANT ENVIRONMENT Listeria monocytogenes is the causative agent of listeriosis, a severe foodborne disease associated with a high case fatality rate. To prevent product contamination with L. monocytogenes, it is crucial to understand Listeria contamination patterns in the food processing plant environment. The aim of this study was to monitor Listeria contamination patterns for two years in six small or very small ready-to-eat (RTE) meat processing plants using a routine combined cultural and molecular typing program. Each of the six plants enrolled in the study were visited on a bi-monthly basis for a two-year period where samples were collected, microbiologically analyzed for Listeria and isolates from positive samples were characterized by molecular subtyping. Year one of the project focused only on non-food contact environmental samples within each plant, and year two focused again on non-food contact environmental samples as well as food contact surfaces and finished RTE meat product samples from participating plants. Between year one and year two of sampling, we conducted an in-plant training session ii involving all employees at each plant. -
UK Standards for Microbiology Investigations
UK Standards for Microbiology Investigations Identification of Listeria species, and other Non-Sporing Gram Positive Rods (except Corynebacterium) Issued by the Standards Unit, Microbiology Services, PHE Bacteriology – Identification | ID 3 | Issue no: 3.1 | Issue date: 29.10.14 | Page: 1 of 29 © Crown copyright 2014 Identification of Listeria species, and other Non-Sporing Gram Positive Rods (except Corynebacterium) Acknowledgments UK Standards for Microbiology Investigations (SMIs) are developed under the auspices of Public Health England (PHE) working in partnership with the National Health Service (NHS), Public Health Wales and with the professional organisations whose logos are displayed below and listed on the website https://www.gov.uk/uk- standards-for-microbiology-investigations-smi-quality-and-consistency-in-clinical- laboratories. SMIs are developed, reviewed and revised by various working groups which are overseen by a steering committee (see https://www.gov.uk/government/groups/standards-for-microbiology-investigations- steering-committee). The contributions of many individuals in clinical, specialist and reference laboratories who have provided information and comments during the development of this document are acknowledged. We are grateful to the Medical Editors for editing the medical content. For further information please contact us at: Standards Unit Microbiology Services Public Health England 61 Colindale Avenue London NW9 5EQ E-mail: [email protected] Website: https://www.gov.uk/uk-standards-for-microbiology-investigations-smi-quality-