Discussion:Microbiology Day3 Assignment

Discussion:Microbiology Day3 Assignment

Discussion:Microbiology Day3 Assignment

Discussion:Microbiology Day3 Assignment

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Answer critical Thinking question #2 for chapter 6 on page 180. Answers should be submitted in word document with any associated references used

1 E.Coli was incubated with aeration in a nutrient medium containing two carbon sources, and the following growth curve was made from this culture

A) Explain what happened at the time marked x

B) Which substrate provided “better” growth condition for the bacteria? How can you tell?

2  Assume that after washing your hands you leave ten bacterial cells on a new bar of soap. You then decided to do a plate count of a soap after it was left in soap dish for 24 hours. You dilute one gram of the soap 1:106 and plate it on heterotrophic plate count agar. After 24 hours of incubation, there are 168 colonies. How many bacterial were on the soap? How did they get there?

3) Heat lamps are commonly used to maintain food at about 50 degree C for as long as 12 hours in cafeteria serving lines . The following experiment was conducted to determine whether this practice poses a potential health hazard.

Beef cubes were surface-inoculated with 500,000 bacterial cells and incubated at 43-53degree C to establish temperature limits for bacterial growth. The following results were obtained from heterotrophic plate counts performed on beef cubes at 6 and 12 hours after incubation.

You must proofread your paper. But do not strictly rely on your computer’s spell-checker and grammar-checker; failure to do so indicates a lack of effort on your part and you can expect your grade to suffer accordingly. Papers with numerous misspelled words and grammatical mistakes will be penalized. Read over your paper – in silence and then aloud – before handing it in and make corrections as necessary. Often it is advantageous to have a friend proofread your paper for obvious errors. Handwritten corrections are preferable to uncorrected mistakes.
Use a standard 10 to 12 point (10 to 12 characters per inch) typeface. Smaller or compressed type and papers with small margins or single-spacing are hard to read. It is better to let your essay run over the recommended number of pages than to try to compress it into fewer pages.

Likewise, large type, large margins, large indentations, triple-spacing, increased leading (space between lines), increased kerning (space between letters), and any other such attempts at “padding” to increase the length of a paper are unacceptable, wasteful of trees, and will not fool your professor.

The paper must be neatly formatted, double-spaced with a one-inch margin on the top, bottom, and sides of each page. When submitting hard copy, be sure to use white paper and print out using dark ink. If it is hard to read your essay, it will also be hard to follow your argument.

 

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