16 results match your criteria coupons detached

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Non-Destructive Characterization of Industrial Membrane Cartridges by Using Liquid-Liquid Displacement Porosimetry (LLDP).

Membranes (Basel) 2020 Nov 25;10(12). Epub 2020 Nov 25.

Departamento de Física Aplicada, ETSIIAA, Universidad de Valladolid, 34071 Palencia, Spain.

This works aims to propose and demonstrate the accuracy of a novel method of characterization aimed for non-destructive analysis of microfiltration (MF) membrane cartridges. The method adapts conventional liquid-liquid displacement porosimetry (LLDP) for performing an in-line porosimetric analysis of the membrane cartridges, getting their pore size distributions (PSDs) and mean pore diameters (). Six commercial filtration cartridges featuring polyethersulfone (PES) pleated membranes were analyzed using a newly designed filtration rig, based on the liquid-liquid displacement porometer, developed at the Institut de la Filtration et des Techniques Séparatives (IFTS) and operated at constant flow. Read More

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November 2020

Stress response and survival of Salmonella Enteritidis in single and dual species biofilms with Pseudomonas fluorescens following repeated exposure to quaternary ammonium compounds.

Int J Food Microbiol 2020 Jul 19;325:108643. Epub 2020 Apr 19.

Department of Food Science and Technology, Korea National University of Transportation, 61 Daehak-ro Jeungpyeong-gun, Chungbuk 27909, Republic of Korea. Electronic address:

Biofilms formed on food contact surfaces are frequently exposed to disinfectants at different concentrations. This study was designed to evaluate how S. Enteritidis in single species and dual species biofilms with P. Read More

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Irrigation waters and pipe-based biofilms as sources for antibiotic-resistant bacteria.

Environ Monit Assess 2016 Jan 24;188(1):56. Epub 2015 Dec 24.

USDA-ARS Environmental Microbial and Food Safety Laboratory, Beltsville Agricultural Research Center, 10300 Baltimore Ave. Bldg. 173, Beltsville, MD, 20705, USA.

The presence of antibiotic-resistant bacteria in environmental surface waters has gained recent attention. Wastewater and drinking water distribution systems are known to disseminate antibiotic-resistant bacteria, with the biofilms that form on the inner-surfaces of the pipeline as a hot spot for proliferation and gene exchange. Pipe-based irrigation systems that utilize surface waters may contribute to the dissemination of antibiotic-resistant bacteria in a similar manner. Read More

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January 2016

Control of pathogens in biofilms on the surface of stainless steel by levulinic acid plus sodium dodecyl sulfate.

Int J Food Microbiol 2015 Aug 24;207:1-7. Epub 2015 Apr 24.

Center for Food Safety, College of Agricultural and Environmental Sciences, University of Georgia, 1109 Experiment Street, Griffin, GA 30223, USA. Electronic address:

The efficacy of levulinic acid (LVA) plus sodium dodecyl sulfate (SDS) to remove or inactivate Listeria monocytogenes, Salmonella Typhimurium, and Shiga toxin-producing Escherichia coli (STEC) in biofilms on the surface of stainless steel coupons was evaluated. Five- or six-strain mixtures (ca. 9. Read More

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Impact of acid adaptation on attachment of Listeria monocytogenes to stainless steel during long-term incubation under low or moderate temperature conditions and on subsequent recalcitrance of attached cells to lethal acid treatments.

Int J Food Microbiol 2014 Feb 19;171:1-7. Epub 2013 Nov 19.

Laboratory of Microbiology and Biotechnology of Foods, Department of Food Science and Human Nutrition, Faculty of Foods, Biotechnology and Development, Agricultural University of Athens (AUA) Iera Odos 75, Athens 11855, Greece.

This study aimed to evaluate the possible impact of acid adaptation of Listeria monocytogenes cells on their attachment to stainless steel (SS) during long-term incubation under either low or moderate temperature conditions and on the subsequent recalcitrance of attached cells to lethal acid treatments. Initially, nonadapted or acid-adapted stationary phase L. monocytogenes cells were used to inoculate (ca. Read More

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February 2014

Differential biofilm formation and chemical disinfection resistance of sessile cells of Listeria monocytogenes strains under monospecies and dual-species (with Salmonella enterica) conditions.

Appl Environ Microbiol 2012 Apr 3;78(8):2586-95. Epub 2012 Feb 3.

Department of Food Science and Technology, Laboratory of Microbiology and Biotechnology of Foods, Agricultural University of Athens, Athens, Greece.

This study aimed to investigate the possible influence of bacterial intra- and interspecies interactions on the ability of Listeria monocytogenes and Salmonella enterica to develop mixed-culture biofilms on an abiotic substratum, as well as on the subsequent resistance of sessile cells to chemical disinfection. Initially, three strains from each species were selected and left to attach and form biofilms on stainless steel (SS) coupons incubated at 15°C for 144 h, in periodically renewable tryptone soy broth (TSB), under either monoculture or mixed-culture (mono-/dual-species) conditions. Following biofilm formation, mixed-culture sessile communities were subjected to 6-min disinfection treatments with (i) benzalkonium chloride (50 ppm), (ii) sodium hypochlorite (10 ppm), (iii) peracetic acid (10 ppm), and (iv) a mixture of hydrogen peroxide (5 ppm) and peracetic acid (5 ppm). Read More

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Effect of acid tolerance response (ATR) on attachment of Listeria monocytogenes Scott A to stainless steel under extended exposure to acid or/and salt stress and resistance of sessile cells to subsequent strong acid challenge.

Int J Food Microbiol 2011 Feb 11;145(2-3):400-6. Epub 2011 Jan 11.

Department of Food Science and Technology, Laboratory of Microbiology and Biotechnology of Foods, Agricultural University of Athens, Iera Odos 75, Athens 11855, Greece.

The aim of this study was to investigate the potential effect of adaptive stationary phase acid tolerance response (ATR) of Listeria monocytogenes Scott A cells on their attachment to stainless steel (SS) under low pH or/and high salt conditions and on the subsequent resistance of sessile cells to strong acid challenge. Nonadapted or acid-adapted stationary-phase L. monocytogenes cells were used to inoculate (ca. Read More

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February 2011

Evaluation of growth/no growth interface of Listeria monocytogenes growing on stainless steel surfaces, detached from biofilms or in suspension, in response to pH and NaCl.

Int J Food Microbiol 2011 Mar 7;145 Suppl 1:S53-60. Epub 2010 Nov 7.

Laboratory of Food Quality Control and Hygiene, Department of Food Science and Technology, Agricultural University of Athens, Iera Odos 75, 118 55 Athens, Greece.

The present study aimed to describe the growth/no growth interface of Listeria monocytogenes at three potential states of growth in industrial environments, namely attached, (Att), detached (Det) from a biofilm, or in a planktonic state (suspended; Plan). A 3-strain composite of L. monocytogenes cells was left to colonize stainless steel (SS) surfaces in tryptic soy broth supplemented with 0. Read More

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Effect of temperature and contact time on Campylobacter jejuni attachment to, and probability of detachment from, stainless steel.

J Food Prot 2010 May;73(5):832-8

Commonwealth Scientific and Industrial Research Organisation, Food and Nutritional Sciences, P.O. Box 3312, Tingalpa DC, Queensland 4173, Australia.

The effect of temperature and contact time on attachment of six Campylobacter jejuni strains to, and probability of their detachment from, stainless steel were determined. Triplicate stainless steel coupons (SSC) were exposed to C. jejuni cell suspensions at 4, 25, 37, and 55 degrees C for 30 min. Read More

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Listeria monocytogenes attachment to and detachment from stainless steel surfaces in a simulated dairy processing environment.

Appl Environ Microbiol 2009 Nov 18;75(22):7182-8. Epub 2009 Sep 18.

Laboratory of Food Quality Control and Hygiene, Department of Food Science and Technology, Agricultural University of Athens, Athens 11855, Greece.

The presence of pathogens in dairy products is often associated with contamination via bacteria attached to food-processing equipment, especially from areas where cleaning/sanitation is difficult. In this study, the attachment of Listeria monocytogenes on stainless steel (SS), followed by detachment and growth in foods, was evaluated under conditions simulating a dairy processing environment. Initially, SS coupons were immersed in milk, vanilla custard, and yogurt inoculated with the pathogen (10(7) CFU/ml or CFU/g) and incubated at two temperatures (5 and 20 degrees C) for 7 days. Read More

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November 2009

Escherichia coli O157:H7 survival, biofilm formation and acid tolerance under simulated slaughter plant moist and dry conditions.

Food Microbiol 2009 Feb 19;26(1):112-9. Epub 2008 Sep 19.

Center for Meat Safety & Quality and Food Safety Cluster, Department of Animal Sciences, Colorado State University, Fort Collins, CO 80523-1171, USA.

Microorganisms persisting in slaughter plant environments may develop acid resistance and be translocated to other environmental surfaces or products. The objective of this study was to evaluate the potential of Escherichia coli O157:H7 to form biofilms and maintain acid resistance, under different culture habituation scenarios, on stainless steel coupons (2 x 5 x 0.08 cm), in the presence of beef carcass decontamination runoff fluids (washings). Read More

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February 2009

Autoinducer-2 activity of gram-negative foodborne pathogenic bacteria and its influence on biofilm formation.

Authors:
Y Yoon J N Sofos

J Food Sci 2008 Apr;73(3):M140-7

Center for Meat Safety and Quality, Department of Animal Sciences, 1171 Campus Delivery, Colorado State University, Fort Collins, CO 80523, USA.

This study evaluated whether autoinducer-2 (AI-2) activity would be associated with biofilm formation by Salmonella and Escherichia coli O157:H7 strains on food contact surfaces. In study I, a Salmonella Typhimurium DT104 strain and an E. coli O157:H7 strain, both AI-2 positive, were individually inoculated into 50 mL of Luria-Bertani (LB) or LB + 0. Read More

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Biofilm colonization dynamics and its influence on the corrosion resistance of austenitic UNS S31603 stainless steel exposed to Gulf of Mexico seawater.

Mar Biotechnol (NY) 2006 Jan-Feb;8(1):62-70. Epub 2006 Feb 8.

Departamento de Materiales y Corrosión, Programa de Corrosión del Golfo de México, Universidad Autónoma de Campeche, Av. Agustín Melgar, C.P. 24030, Campeche, Campeche, Mexico.

Viable bacterial counts, chemical markers, phospholipid fatty acid analysis (PLFA), and Fourier-transformed infrared spectroscopy (FTIR), together with electrochemical methods, were used to study biofilm dynamics and its impact on the corrosion resistance of UNS S31603 stainless steels exposed to the Gulf of Mexico seawater. Biofilms progressively accumulated, peaking on day 20, but finally detached. The extracellular polysaccharide (EPS)/cellular biomass ratio remained low most of the time, but reached its highest level (4. Read More

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October 2006

Impact of inoculum preparation and storage conditions on the response of Escherichia coli O157:H7 populations to undercooking and simulated exposure to gastric fluid.

Appl Environ Microbiol 2006 Jan;72(1):672-9

Department of Animal Sciences, Colorado State University, 1171 Campus Delivery, Fort Collins, CO 80523-1171, USA.

This study evaluated the impact of inoculum preparation and storage conditions on the response of Escherichia coli O157:H7 exposed to consumer-induced stresses simulating undercooking and digestion. Lean beef tissue samples were inoculated with E. coli O157:H7 cultures prepared in tryptic soy broth or meat decontamination runoff fluids (WASH) or detached from moist biofilms or dried biofilms formed on stainless steel coupons immersed in inoculated WASH. Read More

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January 2006

Effectiveness of chemical sanitizers against Campylobacter jejuni-containing biofilms.

J Food Prot 2002 Jul;65(7):1117-21

Center for Food Safety, Department of Food Science and Technology, University of Georgia, Athens 30602-2106, USA.

Survival of Campylobacter jejuni in mixed-culture biofilms was determined after treatment with chemical sanitizers including chlorine, quaternary ammonia, peracetic acid (PAA), and a PAA/peroctanoic acid mixture (PAA/POA). Biofilm-producing bacteria (gram-positive rods, Y1 and W1) were isolated from chicken house nipple drinkers. A meat plant isolate (Pseudomonas sp. Read More

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Persistence of two model enteric viruses (B40-8 and MS-2 bacteriophages) in water distribution pipe biofilms.

Water Sci Technol 2001 ;43(12):133-8

School of Civil and Environmental Engineering, University of New South Wales, Sydney NSW 2052, Australia.

The persistence of two model enteric virions (Bacteroides fragilis phage B40-8 and coliphage MS-2) within pipe biofilms was investigated in situ in an urban distribution system. Biofilms were allowed to develop on uPVC and stainless steel (SS) coupons in a modified Robbins' device for 70 d within a 150 mm uPVC reticulation main. Coupons were then placed in annular reactors and slug dosed with B40-8 and MS-2 phages (10(8) pfu/mL). Read More

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December 2001
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