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https://www.readbyqxmd.com/read/28416858/study-on-e-coli-and-salmonella-biofilms-from-fresh-fruits-and-vegetables
#1
Balagopal Amrutha, Kothandapani Sundar, Prathapkumar Halady Shetty
Foodborne outbreaks associated with fresh fruits and vegetables are on the rise worldwide. Biofilm formation is one of the important traits of pathogens making them strongly attached to substrates as well as express virulence phenotypes. Present study investigates the biofilm forming ability of E. coli and Salmonella sp. isolated from fresh fruits and vegetables. A total of 53 strains, including 35 E. coli and 18 Salmonella sp. isolated from different fruit and vegetable samples were taken into account for the study...
April 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28401747/dynamics-of-mono-and-dual-species-biofilm-formation-and-interactions-between-staphylococcus-aureus-and-gram-negative-bacteria
#2
Jitka Makovcova, Vladimir Babak, Pavel Kulich, Josef Masek, Michal Slany, Lenka Cincarova
Microorganisms are not commonly found in the planktonic state but predominantly form dual- and multispecies biofilms in almost all natural environments. Bacteria in multispecies biofilms cooperate, compete or have neutral interactions according to the involved species. Here, the development of mono- and dual-species biofilms formed by Staphylococcus aureus and other foodborne pathogens such as Salmonella enterica subsp. enterica serovar Enteritidis, potentially pathogenic Raoultella planticola and non-pathogenic Escherichia coli over the course of 24, 48 and 72 h was studied...
April 11, 2017: Microbial Biotechnology
https://www.readbyqxmd.com/read/28398220/antibiotic-loaded-mos-sub-2-sub-nanosheets-to-combat-bacterial-resistance-via-biofilms-inhibition
#3
Xu Zhang, Wentao Zhang, Lizhi Liu, Mei Yang, Lunjie Huang, Kai Chen, Rong Wang, Baowei Yang, Daohong Zhang, Jianlong Wang
The emergence of antibiotic resistance has resulted in an increasing difficulty treating clinical infections associated with biofilms formation, one of the key processes contributed to enhance antibiotic resistance in return. With the rapid development of nanotechnology, a new way to overcome antibiotic resistance was opened up. Based on multiple properties especially antibacterial potential of MoS<sub>2</sub> nanosheets that have aroused wide attention, herein, a novel antimicrobial agent to combat resistant gram-positive <i>Staphylococcus aureus (S...
April 11, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28366839/anti-salmonella-activity-and-probiotic-trends-of-kluyveromyces-marxianus-s-2-05-and-kluyveromyces-lactis-s-3-05-isolated-from-a-french-cheese-tomme-d-orchies
#4
Alexandre Ceugniez, Françoise Coucheney, Philippe Jacques, Georges Daube, Véronique Delcenserie, Djamel Drider
Kluyveromyces marxianus S-2-05 and Kluyveromyces lactis S-3-05 were recently isolated from a traditional French cheese, Tomme d'Orchies, and characterized here for their advantages using a different application perspective. First, we established their anti-Salmonella activity and downregulation of the virulence sopD gene of Salmonella enterica subsp. enterica serovar Typhimurium, mainly in the presence of K. marxianus S-2-05. In addition to their antagonism, these non-Saccharomyces yeasts were able to survive under conditions mimicking the gastrointestinal environment and to form biofilms on an abiotic device such as polystyrene...
March 30, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28363962/mechanisms-for-pseudoalteromonas-piscicida-induced-killing-of-vibrios-and-other-bacterial-pathogens
#5
Gary P Richards, Michael A Watson, David S Needleman, Joseph Uknalis, E Fidelma Boyd, Johnna P Fay
Pseudoalteromonas piscicida are Gram-negative Gammaproteobacteria found in the marine environment. Three strains of pigmented P. piscicida were isolated from seawater and partially characterized by inhibition studies, electron microscopy, and proteolytic enzyme production. Growth inhibition and death occurred around colonies of P. piscicida on lawns of the naturally-occurring marine pathogens Vibrio vulnificus, V. parahaemolyticus, V. cholerae, Photobacterium damselae and Shewanella algae Inhibition also occurred on lawns of Staphylococcus aureus, but not on Escherichia coli O157:H7 or Salmonella enterica serovar Typhimurium...
March 31, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28339743/application-of-bacteriophages-to-reduce-salmonella-attachment-and-biofilms-on-hard-surfaces
#6
Chao Gong, Xiuping Jiang
This study evaluated the effectiveness of bacteriophage treatment for reducing Salmonella attachment and biofilms on hard surfaces. Bacteriophages (n = 6) were selected for bacteriophage treatment based on host ranges against Salmonella isolates (n = 10) obtained from rendering plants. The effectiveness of bacteriophage treatment (104-108 PFU/mL) was initially evaluated against strong Salmonella biofilm formers in 96-well microplate. Then, the bacteriophage treatment (109 PFU/mL) was applied for 7 d to reduce Salmonella attached to the stainless steel surfaces under laboratory and greenhouse conditions...
February 23, 2017: Poultry Science
https://www.readbyqxmd.com/read/28319869/biofilm-inhibition-formation-of-clinical-strains-of-pseudomonas-aeruginosa-mutans-photocatalytic-activity-of-azo-dye-and-gc-ms-analysis-of-leaves-of-lagerstroemia-speciosa
#7
V Sai Saraswathi, Neethu Kamarudheen, K V Bhaskara Rao, K Santhakumar
The investigation was conducted to analyse the bioactive compounds from the leaf extracts of L. speciosa by GC-MS. The extracts were screened for antibacterial and antibiofilm activities against potential clinical strains. The bioactive compounds from the leaves of L. speciosa were extracted by soxhlet continuous extraction method and their chemical composition was analysed by Gas Chromatography-Mass Spectroscopy (GC-MS). The antibacterial activity was evaluated against clinical strain like Staphylococcus aureus, Escherichia coli, P...
March 9, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28303128/a-high-throughput-screening-platform-of-microbial-natural-products-for-the-discovery-of-molecules-with-antibiofilm-properties-against-salmonella
#8
Sonia Paytubi, Mercedes de La Cruz, Jose R Tormo, Jesús Martín, Ignacio González, Victor González-Menendez, Olga Genilloud, Fernando Reyes, Francisca Vicente, Cristina Madrid, Carlos Balsalobre
In this report, we describe a High-Throughput Screening (HTS) to identify compounds that inhibit biofilm formation or cause the disintegration of an already formed biofilm using the Salmonella Enteritidis 3934 strain. Initially, we developed a new methodology for growing Salmonella biofilms suitable for HTS platforms. The biomass associated with biofilm at the solid-liquid interface was quantified by staining both with resazurin and crystal violet, to detect living cells and total biofilm mass, respectively...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28296382/human-%C3%AE-defensin-6-a-small-peptide-that-self-assembles-and-protects-the-host-by-entangling-microbes
#9
Phoom Chairatana, Elizabeth M Nolan
Human α-defensin 6 (HD6) is a 32-residue cysteine-rich peptide that contributes to innate immunity by protecting the host at mucosal sites. This peptide is produced in small intestinal Paneth cells, stored as an 81-residue precursor peptide named proHD6 in granules, and released into the lumen. One unusual feature of HD6 is that it lacks the broad-spectrum antimicrobial activity observed for other human α-defensins, including the Paneth cell peptide human α-defensin 5 (HD5). HD6 exhibits unprecedented self-assembly properties, which confer an unusual host-defense function...
March 15, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28294685/star-anise-illicium-verum-hook-f-as-quorum-sensing-and-biofilm-formation-inhibitor-on-foodborne-bacteria-study-in-milk
#10
Md Ramim Tanver Rahman, Zaixiang Lou, Jun Zhang, Fuhao Yu, Yakindra Prasad Timilsena, Caili Zhang, Yi Zhang, Amr M Bakry
Bacteria use quorum sensing (QS) systems to communicate with each other and regulate microbial group behavior, such as the secretion of virulence factors, including biofilm formation. In order to explore safe, edible agents, the potential of star anise (SA) as an anti-QS and antibiofilm agent and its possible application in milk safety were investigated. Staphylococcus aureus , Salmonella Typhimurium, Pseudomonas aeruginosa , and biosensor strain Chromobacterium violaceum were selected as test strains for QS, biofilm, and exopolysaccharide assays...
March 15, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28270274/crispr-cas-system-presents-multiple-transcriptional-units-including-antisense-rnas-that-are-expressed-in-minimal-medium-and-upregulated-by-ph-in-salmonella-enterica-serovar-typhi
#11
Liliana Medina-Aparicio, Javier E Rebollar-Flores, América A Beltrán-Luviano, Alejandra Vázquez, Rosa M Gutiérrez-Ríos, Leticia Olvera, Edmundo Calva, Ismael Hernández-Lucas
The CRISPR-Cas system is involved in bacterial immunity, virulence, gene regulation, biofilm formation and sporulation. In Salmonella enterica serovar Typhi, this system consists of five transcriptional units including antisense RNAs. It was determined that these genetic elements are expressed in minimal medium and are up-regulated by pH. In addition, a transcriptional characterization of cas3 and ascse2-1 is included herein.
February 2017: Microbiology
https://www.readbyqxmd.com/read/28239484/effects-of-essential-oil-blended-and-single-essential-oils-on-anti-biofilm-formation-of-salmonella-and-escherichia-coli
#12
S Y Oh, W Yun, J H Lee, C H Lee, W K Kwak, J H Cho
BACKGROUND: Biofilms were the third-dimensional structure in the solid surface of bacteria. Bacterial biofilms were difficult to control by host defenses and antibiotic therapies. Escherichia coli (E. coli) and Salmonella were popular pathogenic bacteria that live in human and animal intestines. Essential oils are aromatic oily liquids from plant materials and well known for their antibacterial activities. METHOD: This study was conducted to determine effect of essential oil on anti-biological biofilm formation of E...
2017: Journal of Animal Science and Technology
https://www.readbyqxmd.com/read/28221971/characterizing-salmonella-contamination-in-two-rendering-processing-plants
#13
Chao Gong, Xiuping Jiang
A microbiological investigation on Salmonella contamination was conducted in two U.S. rendering plants to investigate the potential cross-contamination of Salmonella in the rendering processing environment. Sampling locations were predetermined at the areas where Salmonella contamination may potentially occur, including raw materials receiving, crax (rendered materials before grinding process) grinding, and finished meal loading-out areas. Salmonella was either enumerated directly on xylose lysine Tergitol 4 agar plates or enriched in Rappaport-Vassiliadis and tetrathionate broths...
February 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28213018/pathogen-biofilm-formation-on-cantaloupe-surface-and-its-impact-on-the-antibacterial-effect-of-lauroyl-arginate-ethyl
#14
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/28210244/assessment-of-the-antimicrobial-activity-of-olive-leaf-extract-against-foodborne-bacterial-pathogens
#15
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/28178381/comparison-of-the-antimicrobial-and-sanitizer-resistance-of-salmonella-isolates-from-chicken-slaughter-processes-in-korea
#16
So Youn Youn, Ok Mi Jeong, Byung Kook Choi, Suk Chan Jung, Min Su Kang
Salmonella is a foodborne pathogen worldwide. Outbreaks of Salmonella are commonly associated with consumption of contaminated foods such as poultry products. Therefore, the objective of this study was to determine the occurrence, biofilm formation, antibiotic resistance, and sanitizer resistance of Salmonella enterica isolated from chicken carcasses. A total of 318 samples were collected from 15 chicken slaughterhouses in 8 provinces of Korea. They were then examined for Salmonella contamination. S. enterica isolates were tested for their susceptibilities to 15 antimicrobials by broth microdilution method...
February 8, 2017: Journal of Food Science
https://www.readbyqxmd.com/read/28149169/anti-quorum-sensing-and-anti-biofilm-activity-of-amomum-tsaoko-amommum-tsao-ko-crevost-et-lemarie-on-foodborne-pathogens
#17
Md Ramim Tanver Rahman, Zaixiang Lou, Fuhao Yu, Peng Wang, Hongxin Wang
Cell-to-cell communication or quorum sensing (QS) leads to biofilm formation and causing other virulence factors which are extreme problems for food safety, biofilm related infectious diseases etc. This study evaluated the anti-QS activity of the Amomum tsaoko extract (0.5-4 mg/ml) by using Chromobacterium violaceum a biosensor strain and biofilm formation by crystal violate assay. Experimental results demonstrated that the overall yield of Amomum tsao-ko extract was 11.33 ± 0.3% (w/w). MIC for Staphylococcus aureus (Gram positive), Salmonella Typhimurium and Pseudomonas aeruginosa (Gram negative) was 1, 2 and 2 mg/ml, respectively...
February 2017: Saudi Journal of Biological Sciences
https://www.readbyqxmd.com/read/28148244/detailed-analysis-of-c-di-gmp-mediated-regulation-of-csgd-expression-in-salmonella-typhimurium
#18
Irfan Ahmad, Annika Cimdins, Timo Beske, Ute Römling
BACKGROUND: The secondary messenger cyclic di-GMP promotes biofilm formation by up regulating the expression of csgD, encoding the major regulator of rdar biofilm formation in Salmonella typhimurium. The GGDEF/EAL domain proteins regulate the c-di-GMP turnover. There are twenty- two GGDEF/EAL domain proteins in the genome of S. typhimurium. In this study, we dissect the role of individual GGDEF/EAL proteins for csgD expression and rdar biofilm development. RESULTS: Among twelve GGDEF domains, two proteins upregulate and among fifteen EAL domains, four proteins down regulate csgD expression...
February 2, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28120710/the-role-of-universal-stress-proteins-in-bacterial-infections
#19
Andrew O Connor, Siobhán McClean
Universal stress proteins are ubiquitously expressed in bacteria, archaea and plants and other eukaryotes. A general property of USPs is their role in adaptation of bacteria to oxidative stress, high temperature, low pH and/or hypoxia. There is increasing evidence that these proteins facilitate the adaption of bacterial pathogens to the human host environment, thereby facilitating colonisation and pathogenicity. USPs in Mycobacterium tuberculosis are well studied and may play a role in latency of tuberculosis...
January 24, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28081368/smart-metal-organic-framework-coatings-triggered-antibiofilm-compound-release
#20
Birgit Claes, Tom Boudewijns, Laurens Muchez, Geert Hooyberghs, Erik V Van der Eycken, Jozef Vanderleyden, Hans P Steenackers, Dirk E De Vos
Metal-organic frameworks (MOFs) have a large potential for delivery of active molecules. Here, a MOF coating is investigated as a smart host matrix for triggered release of antibiofilm compounds. In addition to a coating consisting of the regular Fe-terephthalate MIL-88B(Fe), a new hydrophobic MIL-88B(Fe) coating is synthesized in hydrothermal conditions using palmitic acid as a lattice terminating group. These porous materials are used as a host matrix for the antibiofilm compound 5-(4-chlorophenyl)-N-(2-isobutyl)-2-aminoimidazole, which has a specific biofilm-inhibiting effect at concentrations at which no activity against planktonic cells is detected...
January 24, 2017: ACS Applied Materials & Interfaces
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