Brock Biology of Microorganisms (15th Edition)
Brock Biology of Microorganisms (15th Edition)
15th Edition
ISBN: 9780134261928
Author: Michael T. Madigan, Kelly S. Bender, Daniel H. Buckley, W. Matthew Sattley, David A. Stahl
Publisher: PEARSON
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Chapter 22.1, Problem 1CR

Q    Which crucial step in the oxidation of copper ores is carried out by Acidithiobacillus ferrooxidans? How is copper recovered from copper solutions produced by leaching?

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1(a)What is a psychrotroph? (b)From what natural sources would you isolate a thermophile? A psychrophile? (C)How does temperature affect the growth of a microorganism? (D)State the temperature class for Escherichia coli, Bacillus sp, Aeromonas sp, Micrococcus luteus, and suggest their optimum growth temperature. 2 (a)Why is dilution important when determining microbe number? (B)How does a decrease in dye colour intensity affect the microbe ? (C)State the possible sources of error if plate counts and colour intensity of dilutions are incorrect or Precautions taken to prevent this from happening. ( this is not a graded assignment)
Azotobacter vinelandii is being studied for the production of alginate from sucrose. In a continuous culture at 28°C with ammonia as a nitrogen source, the alginate yield obtained was 4 g/g of oxygen consumed. It is desired to produce alginate at a rate of 5 kg/h. As the viscosity of alginate in water is considerable, the energy related to stirring the broth cannot be neglected, and the fermenter is equipped with a Rushton-type turbine. For satisfactory agitation and aeration speed, the estimated energy requirement is 1.5 kW. Calculate the cooling requirement.
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Brock Biology of Microorganisms (15th Edition)

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