Lecture+16+Thermaldestruction+_color_

Lecture+16+Thermaldestruction+_color_ - Thermal Destruction...

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Thermal Destruction FST104 February 17, 2012 Extra credit 15 points (maximum) Food microorganisms in the news Must contain the following: 1.Select an food-microorganism featured in the news between 2010-2012 2.Provide at least 2 independent news citations (internet, print) 3.Describe the news items (where, why, how, how long, etc) 4.Describe the organism and important attributes (virulence factors, metabolism, etc). Description should also contain the taxonomic classification, natural habitat, growth parameters, how this organism can be identified 5.Describe follow-up investigations (what happened since) 6.Recommend what can be done to prevent or promote the presence of this organism in food based on principles covered in FST104 1500 words At least 5 citations and no plagiarism and no wikipedia Citations from Journal articles found on PubMed, WebofScience) / textbook Spelling and grammar will be graded Last day to turn in: March 14 - Email MSWord file by 10 am Provide a PAPER COPY in class
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Homework question Graphically determine the specific growth rate for the following microbial culture (remember the units). Time (hours) Cell Density (cells/ml) 0 3.0 x10 4 1 4.1 x 10 4 2 1.0 x 10 5 3 2.5 x 10 5 4 5.5 x 10 5 5 1.2 x 10 6 What is the doubling time (g) of the culture (in minutes)? Hint: Use semi-logarithmic graphing paper (available on the Smartsite) Correct answer: 0.8 hours or 48 min (acceptable range: 43 – 53 min) Remember: Calculate growth rate From the LINEAR portion of the curve
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Plot of the number of survivors over the period of time
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Lecture+16+Thermaldestruction+_color_ - Thermal Destruction...

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