A5067262436- Listeria monocytogenes in Food Safety
- Food Safety and Hygiene
- Salmonella and Campylobacter epidemiology
- Mathematical and Theoretical Epidemiology and Ecology Models
- Vibrio bacteria research studies
- Water Treatment and Disinfection
- Escherichia coli research studies
- Acute Kidney Injury Research
- Evolution and Genetic Dynamics
- Hemodynamic Monitoring and Therapy
- Cardiac, Anesthesia and Surgical Outcomes
- Viral gastroenteritis research and epidemiology
- Evolutionary Game Theory and Cooperation
- Food Supply Chain Traceability
- Wastewater Treatment and Reuse
- Essential Oils and Antimicrobial Activity
- Food Waste Reduction and Sustainability
- Microbial Inactivation Methods
- Congenital Heart Disease Studies
- Stability and Controllability of Differential Equations
- Fault Detection and Control Systems
- Fecal contamination and water quality
- Ecology and Vegetation Dynamics Studies
- Probiotics and Fermented Foods
- Renal function and acid-base balance
Cleveland State University
2015-2024
York University
2012-2013
The Ohio State University
2011
A well-known result in [Hsu-Smith-Waltman, Trans. Amer. Math. Soc. (1996)] states that a competitive semiflow defined on <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="upper X Superscript plus Baseline equals upper 1 times 2 plus"> <mml:semantics> <mml:mrow> <mml:msup> <mml:mi>X</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mo>=</mml:mo> <mml:msubsup> <mml:mn>1</mml:mn> </mml:msubsup> <mml:mo>×</mml:mo> <mml:mn>2</mml:mn>...
The log-linear die-off rate proposed by FSMA is not always appropriate, as the rates of foodborne bacterial pathogens and specified agricultural water quality indicator organisms appear to commonly follow a biphasic pattern with an initial rapid decline followed period tailing. While we observed substantial variation in net culturable population levels Salmonella E. coli at each time point, compliance (i.e., least 2 log 10 over 4 days) be impacted produce type, bacteria, weather; on lettuce...
We investigate the dynamics of a three species competition model, in which all have thesame population but distinct dispersal strategies.Gejji et al. [15] introduced general strategy fortwo species, termed as an ideal free pair this paper, can result inthe distributions two competing at equilibrium.We show that if one adopts whichproduces distribution,then none other persistif they do not form pair.We also pair,then third invade.When is adopting strategywhich produce distribution, we find...
The sub-cellular mechanisms by which residual free chlorine (FC) inactivates E. coli O157:H7 and S. enterica in the absence of organic matter was investigated.
Abstract Enteric pathogens can enter a persister state in which they survive exposure to antibiotics and physicochemical stresses. Subpopulations of such phenotypic dormant variants have been detected vivo planta the laboratory, but their formation natural environment remains largely unexplored. We applied mathematical model predicting switch rate cell phyllosphere identify weather-related stressors associated with E. coli S. enterica on plants based population dynamics published field...
Despite causing outbreaks of foodborne illness linked to lettuce consumption, E. coli O157:H7 (EcO157) declines rapidly when applied onto plants in the field, and few cells survive over prolonged periods time. We hypothesized that these are persisters, which a dormant state arise naturally bacterial populations. When were inoculated with EcO157 laboratory, greatest persister fraction population was observed during decline on dry leaf surfaces. Using mathematical modeling, we calculated...
Abstract Controlling the free chlorine (FC) availability in wash water during sanitization of fresh produce enhances our ability to reduce microbial levels and prevent cross‐contamination. However, maintaining an ideal concentration FC that could risk contamination within system is still a technical challenge industry, indicating need better understand chemistry dynamics. Using bench‐scale experiments modeling approaches, we developed comprehensive mathematical model predict fresh‐cut...
The utility of characterizing the effects strain variation and individual/subgroup susceptibility on dose–response outcomes has motivated search for new approaches beyond popular use exponential model listeriosis. While descriptive models can account such variation, they have limited power to extrapolate details particular outbreaks. By contrast, this study exhibits relationships from a mechanistic basis, quantifying key biological factors involved in pathogen–host dynamics. An efficient...
Listeria monocytogenes is an opportunistic foodborne pathogen which has been implicated in many outbreaks of diseases. This study evaluated the effects gastric acidity and digestion time adults, L. strain food type on survival under simulated stomach conditions adults vitro models with dynamic pH changes occurring throughout exposure. Individual strains as well a cocktail monocytogenes, inoculated at 8 log CFU/mL filtered bovine milk products, 0 % milk, 2 chocolate 3.25 were introduced to...
Food-borne disease outbreaks caused by
Weather affects key aspects of bacterial behavior on plants but has not been extensively investigated as a tool to assess risk crop contamination with human foodborne pathogens. A novel mechanistic model informed by weather factors and state was developed predict population dynamics leafy vegetables tested against published data tracking Escherichia coli O157:H7 (EcO157) Salmonella enterica populations lettuce cilantro plants. The utilizes temperature, radiation, dew point depression...
Recently, the ideal free dispersal strategy has been proven to be evolutionarily stable in spatially discrete as well continuous setting. That is, at equilibrium a species adopting is immune against invasion by any carrying different strategy, other conditions being held equal. In this paper, we consider two-species competition modelwhere one of adopts an but penalized weak Allee effect. We will show rigorously case that disperser invasible range non-ideal strategies, illustrating trade-off...