Discuss how the ratio of unfrozen water at different temperatures affects the food's stability in storage. At -40 ° C, are any degradation processes still active, and if so, which ones?
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Discuss how the ratio of unfrozen water at different temperatures affects the food's stability in storage. At -40 ° C, are any degradation processes still active, and if so, which ones?
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- The table shows the composition of Nutrient Agar per liter.Suppose that you need to prepare 700 mL of Nutrient Agar. How much (in g) of each component do you need? a. Beef extract b. Sodium Chloride c. Agar d. PeptoneWhat is water activity and what role does it play in the growth of microorganisms and yeasts and molds in food? Also name three food preservation methods based on water activity and why they work to increase food stability.Explain why high concentration of suger, salt and acid do not support microbial growth, only it have to be in neutral level?
- Identify chemical reactions involved in food preparation and preservation. Explain how these processes impact life and the environment. Discuss how their rates can be controlled to either enhance their beneficial effects or lessen their adverse effects.Sketch graphs expected for the Product concentration Vs substrate concentration.Classify the electron holders used by microorganisms according to the rate of biodegradation. What advantages and disadvantages does this provide in terms of biodegradation?
- Find the ways to increase the yield and decrease the cost for production of commercially importantmetaboliteby using microbial system. Explain by giving an example.Define and differentiate the following terms: a.Halophilic , b.Capnophilic, and c.MicroaerophilicDetermine the fraction of Vmax that would be obtained when the substrate concentration, [S], is 0.5Km. Vmax fraction: .769
- What is biochemical oxygen demand (BOD) test? At what stage of Sewage treatment this test is performed? BOD level of three samples of water labelled as A, B and C are 30 mg/L, 10mg/L and 500 mg/L respectively. Which sample of water is most polluted?Discuss the following statement: ‘Microbial metabolisms are coupled acrossthe anoxic-oxic interface in several environments.’ Draw on at least threespecific examples to support your arguments.Trace the fate of the N atom during dissimilatory nitrate reduction, nitrification, denitrification, and the anammox reaction, and indicate whether each must occur in an oxic or anoxic environment