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https://www.readbyqxmd.com/read/29140746/inactivation-kinetics-of-pathogens-during-thermal-processing-in-acidified-broth-and-tomato-pur%C3%A3-e-ph-4-5
#1
Evann L Dufort, Jonathan Sogin, Mark R Etzel, Barbara H Ingham
Thermal inactivation kinetics for single strains of Shiga toxin-producing Escherichia coli (STEC), Listeria monocytogenes, and Salmonella enterica were measured in acidified tryptic soy broth (TSB; pH 4.5) heated at 54°C. Inactivation curves also were measured for single-pathogen five-strain cocktails of E. coli O157:H7, L. monocytogenes, and S. enterica heated in tomato purée (pH 4.5) at 52, 54, 56, and 58°C. Inactivation curves were fit using log-linear and nonlinear (Weibull) models. The Weibull model yields the time for a 5-log reduction (t*) and a curve shape parameter (β)...
November 15, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/29134590/application-of-a-virucidal-agent-to-avoid-overestimation-of-phage-kill-during-phage-decontamination-assays-on-ready-to-eat-meats
#2
Andrew Chibeu, S Balamurugan
We describe a method for assessing the effectiveness of tea extract based virucide (TeaF) application to remove phage LISTEX™ P100 not bound to Listeria monocytogenes from stomached rinses prior to direct plating and bacterial enumeration, where the phage is being used as a decontaminant to reduce L. monocytogenes levels on ready-to-eat meat.
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29133393/sequential-induction-of-fur-regulated-genes-in-response-to-iron-limitation-in-bacillus-subtilis
#3
Hualiang Pi, John D Helmann
Bacterial cells modulate transcription in response to changes in iron availability. The ferric uptake regulator (Fur) senses intracellular iron availability and plays a central role in maintaining iron homeostasis in Bacillus subtilis Here we utilized FrvA, a high-affinity Fe(2+) efflux transporter from Listeria monocytogenes, as an inducible genetic tool to deplete intracellular iron. We then characterized the responses of the Fur, FsrA, and PerR regulons as cells transition from iron sufficiency to deficiency...
November 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29132042/long-range-interactions-keep-bacterial-cells-from-liquid-solid-interfaces-evidence-of-a-bacteria-exclusion-zone-near-nafion-surfaces-and-possible-implications-for-bacterial-attachment
#4
Yifan Cheng, Carmen I Moraru
Hydrophilic surfaces of both abiotic and biological origin have been shown to bear particle-exclusion zones as large as hundreds of micrometers at liquid-solid interfaces. Here we present the first systematic investigation and evidence for bacteria-free exclusion zones for several bacterial strains, including pathogens associated with hospital infections and/or foodborne outbreaks: Staphylococcus aureus, Escherichia coli O157:H7, and Listeria monocytogenes. Tests were carried out both in a phosphate buffer, as well as triptic soy broth (TSB) of high ionic strength...
November 10, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29128397/identification-and-characterization-of-molluscan-caveolin-1-ortholog-from-haliotis-discus-discus-possible-involvement-in-embryogenesis-and-host-defense-mechanism-against-pathogenic-stress
#5
H M V Udayantha, S D N K Bathige, Thanthrige Thiunuwan Priyathilaka, Sukkyoung Lee, Myoung-Jin Kim, Jehee Lee
Caveolins are principal membrane proteins of caveolae that play a central role in signal transduction, substrate transport, and membrane trafficking in various cell types. Numerous studies have reported the crucial role of caveolin-1 (CAV1) in response to invading microbes; yet, very little is known about molluscan CAV1. In this study, we identified and characterized CAV1 ortholog from the disk abalone, Haliotis discus discus (HdCAV1). The cDNA sequence of HdCAV1 is 826 bp long and encodes a 127-amino acid polypeptide...
November 8, 2017: Gene Expression Patterns: GEP
https://www.readbyqxmd.com/read/29127810/antimicrobial-activities-of-gaseous-essential-oils-against-listeria-monocytogenes-on-a-laboratory-medium-and-radish-sprouts
#6
Gyeongmin Lee, Yoonbin Kim, Hoikyung Kim, Larry R Beuchat, Jee-Hoon Ryu
The aim of this study was to evaluate the antimicrobial activities of gaseous essential oils (EO gases) against Listeria monocytogenes on the surfaces of a laboratory medium and radish sprouts. We determined the minimal inhibitory concentration (MIC) and minimal lethal concentration (MLC) values of EO gases from eight EOs extracted from basil leaves, carrot seed, cinnamon bark, cinnamon leaves, clove flower buds, oregano leaves, thyme flowers (linalool), and thyme leaves (thymol) against L. monocytogenes on a nutrient agar supplemented with 1% glucose and 0...
November 4, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/29124040/cold-shock-domain-family-proteins-csps-are-involved-in-regulation-of-virulence-cellular-aggregation-and-flagella-based-motility-in-listeria-monocytogenes
#7
Athmanya K Eshwar, Claudia Guldimann, Anna Oevermann, Taurai Tasara
Cold shock-domain family proteins (Csps) are highly conserved nucleic acid binding proteins regulating the expression of various genes including those involved in stress resistance and virulence in bacteria. We show here that Csps are involved in virulence, cell aggregation and flagella-based extracellular motility of Listeria monocytogenes. A L. monocytogenes mutant deleted in all three csp genes (ΔcspABD) is attenuated with respect to human macrophage infection as well as virulence in a zebrafish infection model...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/29121703/effect-of-acta-gene-on-the-invasion-efficiency-of-listeria-monocytogenes-as-observed-in-healthy-and-senescent-intestinal-epithelial-cells
#8
Jimyeong Ha, Hyemin Oh, Sejeong Kim, Jeeyeon Lee, Soomin Lee, Heeyoung Lee, Yukyung Choi, Sung Sil Moon, Kyoung-Hee Choi, Yohan Yoon
Listeria monocytogenes can asymptomatically inhabit the human intestine as a commensal bacterium. However, the mechanism by which L. monocytogenes is able to inhabit the intestine without pathogenic symptoms remains unclear. Here, we compared the invasion efficiency of L. monocytogenes strains with the 268- and 385-bp-long actA gene. Clinical strains SMFM-CI-3 and SMFM-CI-6 with 268-bp actA isolated from patients with listeriosis and strains SMFM-SI-1 and SMFM-SI-2 with the 385-bp gene isolated from carcasses were used for inoculum preparation...
November 9, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29119696/antibacterial-isoeugenol-coating-on-stainless-steel-and-polyethylene-surfaces-prevents-biofilm-growth
#9
Christina Krogsgård Nielsen, Guruprakash Subbiahdoss, Guanghong Zeng, Zakaria Salmi, Jørgen Kjems, Tina Mygind, Torben Snabe, Rikke Louise Meyer
AIMS: Pathogenic bacteria can spread between individuals or between food items via the surfaces they share. Limiting the survival of pathogens on surfaces therefore presents an opportunity to limit at least one route of how pathogens spread. In this study we propose that a simple coating with the essential oil isoeugenol can be used to circumvent the problem of bacterial transfer via surfaces. METHODS AND RESULTS: Two commonly used materials, stainless steel and polyethylene, were coated by physical adsorption, and the coatings were characterized by Raman spectroscopy, atomic force microscopy and water contact angle measurements...
November 9, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/29114396/molecular-evidence-of-listeria-monocytogenes-infection-relapse-in-a-severe-case-of-endocarditis
#10
Giulia Ciceri, Maria Gori, Silvia Bianchi, Giovanni Corrado, Paolo Panisi, Angela Papa, Elisabetta Tanzi, Mirella Pontello
Introduction. Endocarditis is a rare complication of bacteraemia due to Listeria monocytogenes and is characterized by a high fatality rate (37-50 %). Recurrent infection by Listeria monocytogenes occurs even more rarely. Case presentation. We report a case of recurrent Listeria monocytogenes infection that resulted in severe endocarditis in a 66-year-old patient with an aortic valve prosthesis. Relapse was confirmed by pulsed-field gel electrophoresis (PFGE) and multi-locus sequence typing (MLST). Conclusion...
September 2017: JMM Case Reports
https://www.readbyqxmd.com/read/29107333/granzyme-b-disrupts-central-metabolism-and-protein-synthesis-in-bacteria-to-promote-an-immune-cell-death-program
#11
Farokh Dotiwala, Sumit Sen Santara, Andres Ariel Binker-Cosen, Bo Li, Sriram Chandrasekaran, Judy Lieberman
Human cytotoxic lymphocytes kill intracellular microbes. The cytotoxic granule granzyme proteases released by cytotoxic lymphocytes trigger oxidative bacterial death by disrupting electron transport, generating superoxide anion and inactivating bacterial oxidative defenses. However, they also cause non-oxidative cell death because anaerobic bacteria are also killed. Here, we use differential proteomics to identify granzyme B substrates in three unrelated bacteria: Escherichia coli, Listeria monocytogenes, and Mycobacteria tuberculosis...
October 25, 2017: Cell
https://www.readbyqxmd.com/read/29105633/evaluation-of-antimicrobial-cytotoxic-and-genotoxic-activities-of-ganoderma-lucidum-reishi-mushroom
#12
Bulent Ergun
Ganoderma lucidum (GL) is a mushroom used as a traditional remedy for the treatment of various infections since ancient times. This study, was aimed to investigate antimicrobial activity potential of GL against Staphylococcus aureus, Enterococcus faecalis, Listeria monocytogenes, Klebsiella pneumoniae, Pseudomonas aeruginosa, Escherichia coli, Candida albicans, Candida glabrata, Candida krusei, and Candida parapsilopsis. Furthermore, it was also aimed to evaluate the toxicity potential of GL. Antimicrobial activities were screened by using microbroth dilution method...
September 2017: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29104933/heat-resistance-mediated-by-plm58-plasmid-borne-clpl-in-listeria-monocytogenes
#13
Anna Pöntinen, Mariella Aalto-Araneda, Miia Lindström, Hannu Korkeala
Listeria monocytogenes is one of the most heat-resistant non-spore-forming food-borne pathogens and poses a notable risk to food safety, particularly when mild heat treatments are used in food processing and preparation. While general heat stress properties and response mechanisms of L. monocytogenes have been described, accessory mechanisms providing particular L. monocytogenes strains with the advantage of enhanced heat resistance are unknown. Here, we report plasmid-mediated heat resistance of L. monocytogenes for the first time...
November 2017: MSphere
https://www.readbyqxmd.com/read/29104809/mycobacterium-intracellulare-infection-mimicking-progression-of-scleroderma
#14
Simon Krabbe, Merete Engelhart, Sören Thybo, Søren Jacobsen
This case report describes a patient with scleroderma who developed Mycobacterium intracellulare infection, which for more than a year mimicked worsening of her connective tissue disorder. The patient was diagnosed with scleroderma based on puffy fingers that developed into sclerodactyly, abnormal nail fold capillaries, interstitial lung disease, Raynaud's phenomenon, esophageal dysmotility, and positivity for rheumatoid factor and anti-SSA antibodies. She developed massive inflammatory changes of the cutis, the subcutis, and the muscle fasciae of the right leg, that after several failed attempts of immunosuppressive treatments were found to be caused by Mycobacterium intracellulare...
2017: Case Reports in Rheumatology
https://www.readbyqxmd.com/read/29103699/salmonella-spp-and-listeria-monocytogenes-shedding-in-domestic-ruminants-and-characterization-of-potentially-pathogenic-strains
#15
Ana Hurtado, Medelin Ocejo, Beatriz Oporto
Salmonella and Listeria monocytogenes are important human pathogens that can be isolated from the faeces of ruminants, and constitute potential sources of human infection via contamination of food and water or contact (direct or indirect) between humans and animals. A cross-sectional survey including 301 herds was carried out to estimate the prevalence of cattle herds (beef and dairy) and sheep flocks positive for these zoonotic organisms in ruminants in the Basque Country (Northern Spain). The proportion of herds where Salmonella shedding was detected was 5...
October 2017: Veterinary Microbiology
https://www.readbyqxmd.com/read/29099873/assessing-zika-virus-replication-and-the-development-of-zika-specific-antibodies-after-a-mid-gestation-viral-challenge-in-guinea-pigs
#16
Craig J Bierle, Claudia Fernández-Alarcón, Nelmary Hernandez-Alvarado, Jason C Zabeli, Bradley C Janus, Dira S Putri, Mark R Schleiss
Primary Zika virus (ZIKV) infections that occur during pregnancy can cause spontaneous abortion and profoundly disrupt fetal development. While the full range of developmental abnormalities associated with congenital Zika syndrome is not yet known, severe cases of the syndrome can present with microcephaly, extensive neurologic and ocular damage, and pronounced joint malformations. Animal models that accurately recapitulate congenital Zika syndrome are urgently needed for vaccine development and for the study of ZIKV pathogenesis...
2017: PloS One
https://www.readbyqxmd.com/read/29096062/disassembly-of-bacterial-biofilms-by-the-self-assembled-glycolipids-derived-from-renewable-resources
#17
Yadavali Siva Prasad, Sandeep Miryala, Krishnamoorthy Lalitha, K Ranjitha, Shehnaz Barbhaiwala, Vellaisamy Sridharan, C Uma Maheswari, C S Srinandan, Subbiah Nagarajan
More than 80% of chronic infections of bacteria are caused by biofilms. It is also a long-term survival strategy of the pathogens in a nonhost environment. Several amphiphilic molecules have been used in the past to potentially disrupt biofilms; however, the involvement of multistep synthesis, complicated purification and poor yield still remains a major problem. Herein, we report a facile synthesis of glycolipid based surfactant from renewable feedstocks in good yield. The nature of carbohydrate unit present in glycolipid influence the ring chain tautomerism, which resulted in the existence of either cyclic structure or both cyclic and acyclic structures...
November 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29095602/a-sers-based-lateral-flow-strip-biosensor-for-simultaneous-detection-of-listeria-monocytogenes-and-salmonella-enterica-serotype-enteritidis
#18
Hai-Bin Liu, Xin-Jun Du, Yu-Xuan Zang, Ping Li, Shuo Wang
Rapid, sensitive, point-of-care detection of bacteria is extremely important in food safety. To address this requirement, we developed a new surface-enhanced Raman scattering (SERS)-based lateral flow (LF) strip biosensor combined with recombinase polymerase amplification (RPA) for simultaneous detection of Listeria monocytogenes and Salmonella Enterica Serotype Enteritidis. AuMBA@Ag core-shell nanoparticles were used in this SERS-LF. Highly sensitive quantitative detection is achieved by measuring the characteristic peak intensities of SERS tags...
November 2, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29091759/cd5-nk1-1-%C3%AE-%C3%AE-t-cells-that-develop-in-a-bcl11b-independent-manner-participate-in-early-protection-against-infection
#19
Shinya Hatano, Tesshin Murakami, Naoto Noguchi, Hisakata Yamada, Yasunobu Yoshikai
We recently found that a unique subset of innate-like γδ T cells develops from the DN2a stage of the fetal thymus independently of the zinc-finger transcription factor B cell leukemia/lymphoma 11b (Bcl11b). Herein, we characterize these Bcl11b-independent γδ T cells in the periphery as CD5(-)NK1.1(+) and Granzyme B(+), and we show that they are capable of producing interferon (IFN)-γ upon T cell receptor stimulation without Ca(2+) influx. In wild-type mice, these cells were sparse in lymphoid tissues but abundant in non-lymphoid tissues, such as the liver...
October 31, 2017: Cell Reports
https://www.readbyqxmd.com/read/29091578/dual-label-flow-cytometry-based-host-cell-adhesion-assay-to-ascertain-the-prospect-of-probiotic-lactobacillus-plantarum-in-niche-specific-antibacterial-therapy
#20
Sandipan Mukherjee, Aiyagari Ramesh
Host cell adhesion assays that provide quantitative insight on the potential of lactic acid bacteria (LAB) to inhibit adhesion of intestinal pathogens can be leveraged for the development of niche-specific anti-adhesion therapy. Herein, we report a dual-colour flow cytometry (FCM) analysis to assess the ability of probiotic Lactobacillus plantarum strains to impede adhesion of Enterococcus faecalis, Listeria monocytogenes and Staphylococcus aureus onto HT-29 cells. FCM in conjunction with a hierarchical cluster analysis could discern the anti-adhesion potential of L...
November 1, 2017: Microbiology
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