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Ells, Timothy C., Ph.D.

Research Scientist (Food microbiology)

Contact Information:

32 Main street
Kentville, Nova Scotia B4N 1J5
Telephone: 902-365-8542
Fax: 902-365-8455
Email: tim.ells@agr.gc.ca

Areas of Expertise:

  • Food microbiology/ food safety
  • Stress response of food-borne pathogenic bacteria
  • Ecology of food-borne pathogens in minimally processed foods
  • Attachment to surfaces and biofilm formation by food-borne pathogens
  • Plant-derived antimicrobials
  • Modelling growth and inactivation kinetics of food-borne pathogens
  • Detection of human pathogens in foods
  • Molecular biology

Current Projects:

  • Enhancing mitigation strategies for microbiological risks in fresh horticultural products
  • Ecology of food-borne pathogens in fresh-cut fruit and vegetable products
  • Quantitative risk assessment for Cronobacter spp; an emerging food-borne bacterial pathogen

Affiliations:

  • Committee member for the National Listeria Technical Group
  • Member, International Association of Food Protection (IAFP)

Research publications

2019

2018

2017

2015

2014

2011

2010

2009

Other science related publications

2016

  • Lapointe, C., Deschênes, L., Ells, T.C., Bisaillon, Y., and Savard, T. (2016). "Complex microbial ecology in the food processing industry: a competitive multiculture biofilm for meat processors.", Biofilms 7, Porto, Portugal, 26-28 June, 2016, pp. 230. (Abstract)

2015

  • Ells, T.C., Bezanson, G.S., Deschênes, L., and Savard, T. (2015). "Surface type and inoculum level impacts the integration of Escherichia coli strain 0811 into complex biofilm communities formed under simulated meat processing conditions.", IAFP Conference 2015, Portland, Oregon, USA.

2014

  • Arnold, B., Smith, T., and Ells, T.C. (2014). "Fate of Listeria monocytogenes within polymicrobic biofilm communities formed on stainless steel and high density polyethylene during simulated meat processing conditions.", Food Micro 2014, Nantes, France, September 1-4, 2014. (Poster)
  • Fan, L., Hughes, T., Ban, Z., Bezanson, G.S., Forney, C.F., Ells, T.C., LeBlanc, D.I., Guan, J., and Li, J.B. (2014). "Investigation of vapor heat treatment on microbial control and quality of cantaloupes.", United Fresh 2014. (Poster)
  • Forney, C.F., Bezanson, G.S., Ells, T.C., Fan, L., and LeBlanc, D.I. (2014). "Impact of heat sanitation of fresh whole cantaloupe on fruit quality and volatile metabolism.", The 5th Postharvest Unlimited Conference, Conference presentation and abstract.
  • Forney, C.F., Bezanson, G.S., Ells, T.C., Fan, L., and LeBlanc, D.I. (2014). "Impact of heat sanitation of fresh whole cantaloupe on fruit quality and volatile metabolism.", United Fresh 2014, Chicago, IL, USA, June 10-14, 2014. (Poster)
  • Huang, Y., Ells, T.C., and Truelstrup Hansen, L. (2014). "Desiccation survival of Listeria monocytogenes 568 on stainless steel as influenced by sigB and osmolytes.", Food Micro 2014, Nantes, France, September 1-4, 2014. (Poster)

2013

  • Bach, S.J., Guévremont, É., Bezanson, G.S., Brassard, H., Delaquis, P.J., Ells, T.C., Hodges, D.M., Toivonen, P.M.A., and Kostrzynska, M. (2013). Enhancing mitigation strategies for microbiological risks in fresh horticultural products. Research Project FINAL Report AAFC RBPI #1489. (Report)
  • Piercy, M., Burrows, L., Ells, T.C., and Truelstrup Hansen, L. (2013). "Transposon mutant library reveals genes involved in biofilm formation by Listeria monocytogenes 568 at a simulated food plant environmental temperature of 15°C.", International Association of Food Protection Annual Meeting, Charlotte, North Carolina, USA, June 28-31, 2013. (Poster)

2012

  • Ells, T.C., Liang, K.-L., Zwicker, B., Johnston, A., and Gilbert, P. (2012). "Biofilm-forming capacity of Cronobacter spp. On abiotic surfaces and the relationship to thermal resistance.", Biofilms 5 Congress, Paris, France, December 10-12, 2012. (Poster)
  • Forney, C.F., Bezanson, G.S., Fan, L., Ells, T.C., and LeBlanc, D.I. (2012). "Development of the Low Temperature Thermal Treatment (LT3) Process to Sanitize Fresh-cut Cantaloupe.", United Fresh 2012, Dallas Convention Center, Dallas, TX, USA, May 1-23, 2012. (Poster)

2011

  • Bezanson, G.S., Ells, T.C., and Prange, R.K. (2011). "Effect of composting on microbial contamination and quality of fresh fruits and vegetables.", International Symposium on Organic Matter Management and Compost Use in Horticulture, Adelaide, South Australia, Australia, April 3-7, 2011.
  • Truelstrup-Hansen, L., Ells, T.C., and Huang, Y. (2011). "The role of the alternative sigma factor, SigB, in the survival of Listeria monocytogenes 568 during desiccation on stainless steel.", Annual Meeting of the International Association of Food Protection (IAFP 2011), Milwaukee, WI, USA, July 31-August 3, 2011.

2010

  • Ells, T.C., Liang, K.-L., Miled-Bennou, N., and Gnanou-Besse, N. (2010). "Cronobacter Biofilms: the effect of growth media and temperature on formation and their resistance to environmental stresses.", 21st International Conference on Antimicrobial Research (ICAR2010), Valladolid, Spain, November 3-5, 2010. (Poster)
  • Holman, D.B., Ells, T.C., and Truelstrup-Hansen, L. (2010). "Stress resistance in a thermotolerant Listeria monocytogenes 568 Lmo1634 mutant.", XVIIth International Symposium on Problems of Listeriosis (ISOPOL), Porto, Portugal, May 5-7, 2010.
  • Miled-Bennour, R., Ells, T.C., Pagotto, F.J., Farber, J.M., Kérouanton, A., Meheut, T., Colin, P., Joosten, H., Leclercq, A., and Gnanou-Besse, N. (2010). "Genotypic and phenotypic characterisation of a collection of Cronobacter (Enterobacter sakazakii) isolates [International Journal of Food Microbiology (2010) 139, pp.116-125] (Erratum).", International Journal of Food Microbiology, 144(1), pp. 209-211.

2009

  • Ells, T.C. and Truelstrup-Hansen, L. (2009). "A mild thermal treatment of shredded cabbage enhances the growth of Listeria spp. during refrigerated storage.", European Federation of Food Science and Technology (EFFoST) Annual Meeting: New Challenges in Food Preservation, Budapest, Hungary, November 11-13, 2009.
  • Ells, T.C. and Truelstrup-Hansen, L. (2009). "Inactivation of treA causes increased thermal and osmotic resistance in Listeria monocytogenes strain 568.", European Federation of Food Science and Technology (EFFoST) Annual Meeting: New Challenges in Food Preservation, Budapest, Hungary, November 11-13, 2009.
  • Truelstrup-Hansen, L., Chen, Y., and Ells, T.C. (2009). "Biofilm formation by Listeria monocytogenes 568 and its transposon mutants.", 109th General Meeting of American Society for Microbiology, Philadelphia, PA, USA, May 17-21, 2009.
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