Spores and toxin-producing microorganism produce toxins need higher Aw than minimum Aw for microbial growth. How could food industry benefit from this fact?
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Spores and toxin-producing microorganism produce toxins need higher Aw than minimum Aw for microbial growth.
How could food industry benefit from this fact?
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- What is the optimum growth temperature for most human pathogens? Explain.Savlon Extra” disinfectant is known to exhibit good antimicrobial activity against Shigella dysenteriae. At 20oC a concentration of 5% v/v kills 2.0 x106 Sh. dysenteriae cells in 15 minutes. At 25oC the organisms were killed in 5 minutes. a) Calculate the temperature coefficient of Savlon Extra b). How long will it take the same concentration to kill the same number of Sh. dysenteriae cells at 30oC?Microorganisms are often grouped according to their optimum growth temperatures. Which groups are most likely to spoil refrigerated foods?
- Identify the microorganism/ group of microorganisms involved in the spoilage of the following food: a.. Canned curdled evaporated milk b. Blue cottony growth on orangesIf lysozyme is added to a microbial culture. Predict what will be observed if the culture is affected by the action of lysozyme. A change in color will be visible in the tube. An increase in absorbance will be observed over time. A decrease in absorbance will be observed over time. An increase in turbidity will be observed over time.How we can isolate microorganism from food? Please briefly explain at your own words.
- The thermal death point is best described as:(a) The highest temperature that will support growth of amicrobial culture(b) The length of time required for killing 100% of mi-crobes in a 24-hour culture that is heated to 100°C(c) The temperature at which a previously growing 24-hourculture will begin to die(d) The temperature at which 100% of the microbes in a24-hour culture will be killed in 10 minutesWhat are other food items that are derived from microbial processes? Identify the microorganisms involved in the production of these food microbiological productsThe optimum growth pH for a microorganism is usually: 4,5,7 or 8
- A culture consisting of 100 litres of nutrient medium containing 12 g l-1 of growth limiting substrate is inoculated with 10g of bacteria in a batch fermenter. The yield of biomass from substrate is 0.05 g g-1 . The maintenance coefficient is 2.0 g g-1 h -1 . The specific rate of product formation due to maintenance is 1.0 h-1 . The maximum specific growth rate of the organism is 0.3 h -1 . YPX= 7.7 and product formation is directly linked with metabolism. a) What is the time required to produce 15 g of biomass? !!!!! ANS IS 3.07 HRS!!!! STEPS on how to reach this pleaseMicrobes that can survive and thrive in extreme environments are called extremophiles. In this context, what term is the most accurate to describe the microbes that can grow in salty wastewater? Acidophiles Psychrophiles Thermophiles O HalophilesMicrobes are exposed to a wide variety of environmental factors that affect growth and survival. By giving two (2) examples, discuss how the microbial survival in various environmental conditions has been used to understand its ability to make flavorful and long shelf-life type of foods.